1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/layout/base/nsLayoutUtils.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,6597 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim: set ts=2 sw=2 et tw=78: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#include "nsLayoutUtils.h"
1.11 +
1.12 +#include "mozilla/ArrayUtils.h"
1.13 +#include "mozilla/BasicEvents.h"
1.14 +#include "mozilla/MemoryReporting.h"
1.15 +#include "nsPresContext.h"
1.16 +#include "nsIContent.h"
1.17 +#include "nsIDOMHTMLDocument.h"
1.18 +#include "nsIDOMHTMLElement.h"
1.19 +#include "nsFrameList.h"
1.20 +#include "nsGkAtoms.h"
1.21 +#include "nsIAtom.h"
1.22 +#include "nsCSSPseudoElements.h"
1.23 +#include "nsCSSAnonBoxes.h"
1.24 +#include "nsCSSColorUtils.h"
1.25 +#include "nsView.h"
1.26 +#include "nsPlaceholderFrame.h"
1.27 +#include "nsIScrollableFrame.h"
1.28 +#include "nsIDOMEvent.h"
1.29 +#include "nsDisplayList.h"
1.30 +#include "nsRegion.h"
1.31 +#include "nsFrameManager.h"
1.32 +#include "nsBlockFrame.h"
1.33 +#include "nsBidiPresUtils.h"
1.34 +#include "imgIContainer.h"
1.35 +#include "ImageOps.h"
1.36 +#include "gfxRect.h"
1.37 +#include "gfxContext.h"
1.38 +#include "nsRenderingContext.h"
1.39 +#include "nsIInterfaceRequestorUtils.h"
1.40 +#include "nsCSSRendering.h"
1.41 +#include "nsThemeConstants.h"
1.42 +#include "nsPIDOMWindow.h"
1.43 +#include "nsIDocShell.h"
1.44 +#include "nsIWidget.h"
1.45 +#include "gfxMatrix.h"
1.46 +#include "gfxPoint3D.h"
1.47 +#include "gfxPrefs.h"
1.48 +#include "gfxTypes.h"
1.49 +#include "nsTArray.h"
1.50 +#include "mozilla/dom/HTMLCanvasElement.h"
1.51 +#include "nsICanvasRenderingContextInternal.h"
1.52 +#include "gfxPlatform.h"
1.53 +#include <algorithm>
1.54 +#include "mozilla/dom/HTMLVideoElement.h"
1.55 +#include "mozilla/dom/HTMLImageElement.h"
1.56 +#include "mozilla/dom/DOMRect.h"
1.57 +#include "imgIRequest.h"
1.58 +#include "nsIImageLoadingContent.h"
1.59 +#include "nsCOMPtr.h"
1.60 +#include "nsCSSProps.h"
1.61 +#include "nsListControlFrame.h"
1.62 +#include "mozilla/dom/Element.h"
1.63 +#include "nsCanvasFrame.h"
1.64 +#include "gfxDrawable.h"
1.65 +#include "gfxUtils.h"
1.66 +#include "nsDataHashtable.h"
1.67 +#include "nsTextFrame.h"
1.68 +#include "nsFontFaceList.h"
1.69 +#include "nsFontInflationData.h"
1.70 +#include "nsSVGUtils.h"
1.71 +#include "SVGTextFrame.h"
1.72 +#include "nsStyleStructInlines.h"
1.73 +#include "nsStyleTransformMatrix.h"
1.74 +#include "nsIFrameInlines.h"
1.75 +#include "ImageContainer.h"
1.76 +#include "nsComputedDOMStyle.h"
1.77 +#include "ActiveLayerTracker.h"
1.78 +#include "mozilla/gfx/2D.h"
1.79 +#include "gfx2DGlue.h"
1.80 +#include "mozilla/LookAndFeel.h"
1.81 +#include "UnitTransforms.h"
1.82 +#include "TiledLayerBuffer.h" // For TILEDLAYERBUFFER_TILE_SIZE
1.83 +
1.84 +#include "mozilla/Preferences.h"
1.85 +
1.86 +#include "mozilla/LookAndFeel.h"
1.87 +
1.88 +#ifdef MOZ_XUL
1.89 +#include "nsXULPopupManager.h"
1.90 +#endif
1.91 +
1.92 +#include "GeckoProfiler.h"
1.93 +#include "nsAnimationManager.h"
1.94 +#include "nsTransitionManager.h"
1.95 +#include "RestyleManager.h"
1.96 +
1.97 +// Additional includes used on B2G by code in GetOrMaybeCreateDisplayPort().
1.98 +#ifdef MOZ_WIDGET_GONK
1.99 +#include "mozilla/layers/AsyncPanZoomController.h"
1.100 +#endif
1.101 +
1.102 +using namespace mozilla;
1.103 +using namespace mozilla::css;
1.104 +using namespace mozilla::dom;
1.105 +using namespace mozilla::layers;
1.106 +using namespace mozilla::layout;
1.107 +using namespace mozilla::gfx;
1.108 +
1.109 +using mozilla::image::Angle;
1.110 +using mozilla::image::Flip;
1.111 +using mozilla::image::ImageOps;
1.112 +using mozilla::image::Orientation;
1.113 +
1.114 +#define GRID_ENABLED_PREF_NAME "layout.css.grid.enabled"
1.115 +#define STICKY_ENABLED_PREF_NAME "layout.css.sticky.enabled"
1.116 +#define TEXT_ALIGN_TRUE_ENABLED_PREF_NAME "layout.css.text-align-true-value.enabled"
1.117 +
1.118 +#ifdef DEBUG
1.119 +// TODO: remove, see bug 598468.
1.120 +bool nsLayoutUtils::gPreventAssertInCompareTreePosition = false;
1.121 +#endif // DEBUG
1.122 +
1.123 +typedef FrameMetrics::ViewID ViewID;
1.124 +
1.125 +/* static */ uint32_t nsLayoutUtils::sFontSizeInflationEmPerLine;
1.126 +/* static */ uint32_t nsLayoutUtils::sFontSizeInflationMinTwips;
1.127 +/* static */ uint32_t nsLayoutUtils::sFontSizeInflationLineThreshold;
1.128 +/* static */ int32_t nsLayoutUtils::sFontSizeInflationMappingIntercept;
1.129 +/* static */ uint32_t nsLayoutUtils::sFontSizeInflationMaxRatio;
1.130 +/* static */ bool nsLayoutUtils::sFontSizeInflationForceEnabled;
1.131 +/* static */ bool nsLayoutUtils::sFontSizeInflationDisabledInMasterProcess;
1.132 +/* static */ bool nsLayoutUtils::sInvalidationDebuggingIsEnabled;
1.133 +/* static */ bool nsLayoutUtils::sCSSVariablesEnabled;
1.134 +/* static */ bool nsLayoutUtils::sInterruptibleReflowEnabled;
1.135 +
1.136 +static ViewID sScrollIdCounter = FrameMetrics::START_SCROLL_ID;
1.137 +
1.138 +typedef nsDataHashtable<nsUint64HashKey, nsIContent*> ContentMap;
1.139 +static ContentMap* sContentMap = nullptr;
1.140 +static ContentMap& GetContentMap() {
1.141 + if (!sContentMap) {
1.142 + sContentMap = new ContentMap();
1.143 + }
1.144 + return *sContentMap;
1.145 +}
1.146 +
1.147 +// When the pref "layout.css.grid.enabled" changes, this function is invoked
1.148 +// to let us update kDisplayKTable, to selectively disable or restore the
1.149 +// entries for "grid" and "inline-grid" in that table.
1.150 +static void
1.151 +GridEnabledPrefChangeCallback(const char* aPrefName, void* aClosure)
1.152 +{
1.153 + MOZ_ASSERT(strncmp(aPrefName, GRID_ENABLED_PREF_NAME,
1.154 + ArrayLength(GRID_ENABLED_PREF_NAME)) == 0,
1.155 + "We only registered this callback for a single pref, so it "
1.156 + "should only be called for that pref");
1.157 +
1.158 + static int32_t sIndexOfGridInDisplayTable;
1.159 + static int32_t sIndexOfInlineGridInDisplayTable;
1.160 + static bool sAreGridKeywordIndicesInitialized; // initialized to false
1.161 +
1.162 + bool isGridEnabled =
1.163 + Preferences::GetBool(GRID_ENABLED_PREF_NAME, false);
1.164 + if (!sAreGridKeywordIndicesInitialized) {
1.165 + // First run: find the position of "grid" and "inline-grid" in
1.166 + // kDisplayKTable.
1.167 + sIndexOfGridInDisplayTable =
1.168 + nsCSSProps::FindIndexOfKeyword(eCSSKeyword_grid,
1.169 + nsCSSProps::kDisplayKTable);
1.170 + MOZ_ASSERT(sIndexOfGridInDisplayTable >= 0,
1.171 + "Couldn't find grid in kDisplayKTable");
1.172 + sIndexOfInlineGridInDisplayTable =
1.173 + nsCSSProps::FindIndexOfKeyword(eCSSKeyword_inline_grid,
1.174 + nsCSSProps::kDisplayKTable);
1.175 + MOZ_ASSERT(sIndexOfInlineGridInDisplayTable >= 0,
1.176 + "Couldn't find inline-grid in kDisplayKTable");
1.177 + sAreGridKeywordIndicesInitialized = true;
1.178 + }
1.179 +
1.180 + // OK -- now, stomp on or restore the "grid" entries in kDisplayKTable,
1.181 + // depending on whether the grid pref is enabled vs. disabled.
1.182 + if (sIndexOfGridInDisplayTable >= 0) {
1.183 + nsCSSProps::kDisplayKTable[sIndexOfGridInDisplayTable] =
1.184 + isGridEnabled ? eCSSKeyword_grid : eCSSKeyword_UNKNOWN;
1.185 + }
1.186 + if (sIndexOfInlineGridInDisplayTable >= 0) {
1.187 + nsCSSProps::kDisplayKTable[sIndexOfInlineGridInDisplayTable] =
1.188 + isGridEnabled ? eCSSKeyword_inline_grid : eCSSKeyword_UNKNOWN;
1.189 + }
1.190 +}
1.191 +
1.192 +// When the pref "layout.css.sticky.enabled" changes, this function is invoked
1.193 +// to let us update kPositionKTable, to selectively disable or restore the
1.194 +// entry for "sticky" in that table.
1.195 +static void
1.196 +StickyEnabledPrefChangeCallback(const char* aPrefName, void* aClosure)
1.197 +{
1.198 + MOZ_ASSERT(strncmp(aPrefName, STICKY_ENABLED_PREF_NAME,
1.199 + ArrayLength(STICKY_ENABLED_PREF_NAME)) == 0,
1.200 + "We only registered this callback for a single pref, so it "
1.201 + "should only be called for that pref");
1.202 +
1.203 + static int32_t sIndexOfStickyInPositionTable;
1.204 + static bool sIsStickyKeywordIndexInitialized; // initialized to false
1.205 +
1.206 + bool isStickyEnabled =
1.207 + Preferences::GetBool(STICKY_ENABLED_PREF_NAME, false);
1.208 +
1.209 + if (!sIsStickyKeywordIndexInitialized) {
1.210 + // First run: find the position of "sticky" in kPositionKTable.
1.211 + sIndexOfStickyInPositionTable =
1.212 + nsCSSProps::FindIndexOfKeyword(eCSSKeyword_sticky,
1.213 + nsCSSProps::kPositionKTable);
1.214 + MOZ_ASSERT(sIndexOfStickyInPositionTable >= 0,
1.215 + "Couldn't find sticky in kPositionKTable");
1.216 + sIsStickyKeywordIndexInitialized = true;
1.217 + }
1.218 +
1.219 + // OK -- now, stomp on or restore the "sticky" entry in kPositionKTable,
1.220 + // depending on whether the sticky pref is enabled vs. disabled.
1.221 + nsCSSProps::kPositionKTable[sIndexOfStickyInPositionTable] =
1.222 + isStickyEnabled ? eCSSKeyword_sticky : eCSSKeyword_UNKNOWN;
1.223 +}
1.224 +
1.225 +// When the pref "layout.css.text-align-true-value.enabled" changes, this
1.226 +// function is called to let us update kTextAlignKTable & kTextAlignLastKTable,
1.227 +// to selectively disable or restore the entries for "true" in those tables.
1.228 +static void
1.229 +TextAlignTrueEnabledPrefChangeCallback(const char* aPrefName, void* aClosure)
1.230 +{
1.231 + NS_ASSERTION(strcmp(aPrefName, TEXT_ALIGN_TRUE_ENABLED_PREF_NAME) == 0,
1.232 + "Did you misspell " TEXT_ALIGN_TRUE_ENABLED_PREF_NAME " ?");
1.233 +
1.234 + static bool sIsInitialized;
1.235 + static int32_t sIndexOfTrueInTextAlignTable;
1.236 + static int32_t sIndexOfTrueInTextAlignLastTable;
1.237 + bool isTextAlignTrueEnabled =
1.238 + Preferences::GetBool(TEXT_ALIGN_TRUE_ENABLED_PREF_NAME, false);
1.239 +
1.240 + if (!sIsInitialized) {
1.241 + // First run: find the position of "true" in kTextAlignKTable.
1.242 + sIndexOfTrueInTextAlignTable =
1.243 + nsCSSProps::FindIndexOfKeyword(eCSSKeyword_true,
1.244 + nsCSSProps::kTextAlignKTable);
1.245 + // First run: find the position of "true" in kTextAlignLastKTable.
1.246 + sIndexOfTrueInTextAlignLastTable =
1.247 + nsCSSProps::FindIndexOfKeyword(eCSSKeyword_true,
1.248 + nsCSSProps::kTextAlignLastKTable);
1.249 + sIsInitialized = true;
1.250 + }
1.251 +
1.252 + // OK -- now, stomp on or restore the "true" entry in the keyword tables,
1.253 + // depending on whether the pref is enabled vs. disabled.
1.254 + MOZ_ASSERT(sIndexOfTrueInTextAlignTable >= 0);
1.255 + nsCSSProps::kTextAlignKTable[sIndexOfTrueInTextAlignTable] =
1.256 + isTextAlignTrueEnabled ? eCSSKeyword_true : eCSSKeyword_UNKNOWN;
1.257 + MOZ_ASSERT(sIndexOfTrueInTextAlignLastTable >= 0);
1.258 + nsCSSProps::kTextAlignLastKTable[sIndexOfTrueInTextAlignLastTable] =
1.259 + isTextAlignTrueEnabled ? eCSSKeyword_true : eCSSKeyword_UNKNOWN;
1.260 +}
1.261 +
1.262 +template <class AnimationsOrTransitions>
1.263 +static AnimationsOrTransitions*
1.264 +HasAnimationOrTransitionForCompositor(nsIContent* aContent,
1.265 + nsIAtom* aAnimationProperty,
1.266 + nsCSSProperty aProperty)
1.267 +{
1.268 + AnimationsOrTransitions* animations =
1.269 + static_cast<AnimationsOrTransitions*>(aContent->GetProperty(aAnimationProperty));
1.270 + if (animations) {
1.271 + bool propertyMatches = animations->HasAnimationOfProperty(aProperty);
1.272 + if (propertyMatches &&
1.273 + animations->CanPerformOnCompositorThread(
1.274 + CommonElementAnimationData::CanAnimate_AllowPartial)) {
1.275 + return animations;
1.276 + }
1.277 + }
1.278 +
1.279 + return nullptr;
1.280 +}
1.281 +
1.282 +bool
1.283 +nsLayoutUtils::HasAnimationsForCompositor(nsIContent* aContent,
1.284 + nsCSSProperty aProperty)
1.285 +{
1.286 + if (!aContent->MayHaveAnimations())
1.287 + return false;
1.288 + return HasAnimationOrTransitionForCompositor<ElementAnimations>
1.289 + (aContent, nsGkAtoms::animationsProperty, aProperty) ||
1.290 + HasAnimationOrTransitionForCompositor<ElementTransitions>
1.291 + (aContent, nsGkAtoms::transitionsProperty, aProperty);
1.292 +}
1.293 +
1.294 +template <class AnimationsOrTransitions>
1.295 +AnimationsOrTransitions*
1.296 +mozilla::HasAnimationOrTransition(nsIContent* aContent,
1.297 + nsIAtom* aAnimationProperty,
1.298 + nsCSSProperty aProperty)
1.299 +{
1.300 + AnimationsOrTransitions* animations =
1.301 + static_cast<AnimationsOrTransitions*>(aContent->GetProperty(aAnimationProperty));
1.302 + if (animations) {
1.303 + bool propertyMatches = animations->HasAnimationOfProperty(aProperty);
1.304 + if (propertyMatches) {
1.305 + return animations;
1.306 + }
1.307 + }
1.308 +
1.309 + return nullptr;
1.310 +}
1.311 +
1.312 +template ElementAnimations*
1.313 +mozilla::HasAnimationOrTransition<ElementAnimations>(nsIContent* aContent,
1.314 + nsIAtom* aAnimationProperty,
1.315 + nsCSSProperty aProperty);
1.316 +
1.317 +template ElementTransitions*
1.318 +mozilla::HasAnimationOrTransition<ElementTransitions>(nsIContent* aContent,
1.319 + nsIAtom* aAnimationProperty,
1.320 + nsCSSProperty aProperty);
1.321 +
1.322 +
1.323 +bool
1.324 +nsLayoutUtils::HasAnimations(nsIContent* aContent,
1.325 + nsCSSProperty aProperty)
1.326 +{
1.327 + if (!aContent->MayHaveAnimations())
1.328 + return false;
1.329 + return HasAnimationOrTransition<ElementAnimations>
1.330 + (aContent, nsGkAtoms::animationsProperty, aProperty) ||
1.331 + HasAnimationOrTransition<ElementTransitions>
1.332 + (aContent, nsGkAtoms::transitionsProperty, aProperty);
1.333 +}
1.334 +
1.335 +static gfxSize
1.336 +GetScaleForValue(const nsStyleAnimation::Value& aValue,
1.337 + nsIFrame* aFrame)
1.338 +{
1.339 + if (!aFrame) {
1.340 + NS_WARNING("No frame.");
1.341 + return gfxSize();
1.342 + }
1.343 + if (aValue.GetUnit() != nsStyleAnimation::eUnit_Transform) {
1.344 + NS_WARNING("Expected a transform.");
1.345 + return gfxSize();
1.346 + }
1.347 +
1.348 + nsCSSValueSharedList* list = aValue.GetCSSValueSharedListValue();
1.349 + MOZ_ASSERT(list->mHead);
1.350 +
1.351 + if (list->mHead->mValue.GetUnit() == eCSSUnit_None) {
1.352 + // There is an animation, but no actual transform yet.
1.353 + return gfxSize();
1.354 + }
1.355 +
1.356 + nsRect frameBounds = aFrame->GetRect();
1.357 + bool dontCare;
1.358 + gfx3DMatrix transform = nsStyleTransformMatrix::ReadTransforms(
1.359 + list->mHead,
1.360 + aFrame->StyleContext(),
1.361 + aFrame->PresContext(), dontCare, frameBounds,
1.362 + aFrame->PresContext()->AppUnitsPerDevPixel());
1.363 +
1.364 + gfxMatrix transform2d;
1.365 + bool canDraw2D = transform.CanDraw2D(&transform2d);
1.366 + if (!canDraw2D) {
1.367 + return gfxSize();
1.368 + }
1.369 +
1.370 + return transform2d.ScaleFactors(true);
1.371 +}
1.372 +
1.373 +float
1.374 +GetSuitableScale(float aMaxScale, float aMinScale)
1.375 +{
1.376 + // If the minimum scale >= 1.0f, use it; if the maximum <= 1.0f, use it;
1.377 + // otherwise use 1.0f.
1.378 + if (aMinScale >= 1.0f) {
1.379 + return aMinScale;
1.380 + }
1.381 + else if (aMaxScale <= 1.0f) {
1.382 + return aMaxScale;
1.383 + }
1.384 +
1.385 + return 1.0f;
1.386 +}
1.387 +
1.388 +gfxSize
1.389 +nsLayoutUtils::ComputeSuitableScaleForAnimation(nsIContent* aContent)
1.390 +{
1.391 + gfxSize maxScale(1.0f, 1.0f);
1.392 + gfxSize minScale(1.0f, 1.0f);
1.393 +
1.394 + ElementAnimations* animations = HasAnimationOrTransitionForCompositor<ElementAnimations>
1.395 + (aContent, nsGkAtoms::animationsProperty, eCSSProperty_transform);
1.396 + if (animations) {
1.397 + for (uint32_t animIdx = animations->mAnimations.Length(); animIdx-- != 0; ) {
1.398 + mozilla::StyleAnimation& anim = animations->mAnimations[animIdx];
1.399 + for (uint32_t propIdx = anim.mProperties.Length(); propIdx-- != 0; ) {
1.400 + AnimationProperty& prop = anim.mProperties[propIdx];
1.401 + if (prop.mProperty == eCSSProperty_transform) {
1.402 + for (uint32_t segIdx = prop.mSegments.Length(); segIdx-- != 0; ) {
1.403 + AnimationPropertySegment& segment = prop.mSegments[segIdx];
1.404 + gfxSize from = GetScaleForValue(segment.mFromValue,
1.405 + aContent->GetPrimaryFrame());
1.406 + maxScale.width = std::max<float>(maxScale.width, from.width);
1.407 + maxScale.height = std::max<float>(maxScale.height, from.height);
1.408 + minScale.width = std::min<float>(minScale.width, from.width);
1.409 + minScale.height = std::min<float>(minScale.height, from.height);
1.410 + gfxSize to = GetScaleForValue(segment.mToValue,
1.411 + aContent->GetPrimaryFrame());
1.412 + maxScale.width = std::max<float>(maxScale.width, to.width);
1.413 + maxScale.height = std::max<float>(maxScale.height, to.height);
1.414 + minScale.width = std::min<float>(minScale.width, to.width);
1.415 + minScale.height = std::min<float>(minScale.height, to.height);
1.416 + }
1.417 + }
1.418 + }
1.419 + }
1.420 + }
1.421 +
1.422 + ElementTransitions* transitions = HasAnimationOrTransitionForCompositor<ElementTransitions>
1.423 + (aContent, nsGkAtoms::transitionsProperty, eCSSProperty_transform);
1.424 + if (transitions) {
1.425 + for (uint32_t i = 0, i_end = transitions->mPropertyTransitions.Length();
1.426 + i < i_end; ++i){
1.427 + ElementPropertyTransition &pt = transitions->mPropertyTransitions[i];
1.428 + if (pt.IsRemovedSentinel()) {
1.429 + continue;
1.430 + }
1.431 + MOZ_ASSERT(pt.mProperties.Length() == 1,
1.432 + "Should have one animation property for a transition");
1.433 + MOZ_ASSERT(pt.mProperties[0].mSegments.Length() == 1,
1.434 + "Animation property should have one segment for a transition");
1.435 + const AnimationPropertySegment& segment = pt.mProperties[0].mSegments[0];
1.436 +
1.437 + if (pt.mProperties[0].mProperty == eCSSProperty_transform) {
1.438 + gfxSize start = GetScaleForValue(segment.mFromValue,
1.439 + aContent->GetPrimaryFrame());
1.440 + maxScale.width = std::max<float>(maxScale.width, start.width);
1.441 + maxScale.height = std::max<float>(maxScale.height, start.height);
1.442 + minScale.width = std::min<float>(minScale.width, start.width);
1.443 + minScale.height = std::min<float>(minScale.height, start.height);
1.444 + gfxSize end = GetScaleForValue(segment.mToValue,
1.445 + aContent->GetPrimaryFrame());
1.446 + maxScale.width = std::max<float>(maxScale.width, end.width);
1.447 + maxScale.height = std::max<float>(maxScale.height, end.height);
1.448 + minScale.width = std::min<float>(minScale.width, end.width);
1.449 + minScale.height = std::min<float>(minScale.height, end.height);
1.450 + }
1.451 + }
1.452 + }
1.453 +
1.454 + return gfxSize(GetSuitableScale(maxScale.width, minScale.width),
1.455 + GetSuitableScale(maxScale.height, minScale.height));
1.456 +}
1.457 +
1.458 +bool
1.459 +nsLayoutUtils::AreAsyncAnimationsEnabled()
1.460 +{
1.461 + static bool sAreAsyncAnimationsEnabled;
1.462 + static bool sAsyncPrefCached = false;
1.463 +
1.464 + if (!sAsyncPrefCached) {
1.465 + sAsyncPrefCached = true;
1.466 + Preferences::AddBoolVarCache(&sAreAsyncAnimationsEnabled,
1.467 + "layers.offmainthreadcomposition.async-animations");
1.468 + }
1.469 +
1.470 + return sAreAsyncAnimationsEnabled &&
1.471 + gfxPlatform::OffMainThreadCompositingEnabled();
1.472 +}
1.473 +
1.474 +bool
1.475 +nsLayoutUtils::IsAnimationLoggingEnabled()
1.476 +{
1.477 + static bool sShouldLog;
1.478 + static bool sShouldLogPrefCached;
1.479 +
1.480 + if (!sShouldLogPrefCached) {
1.481 + sShouldLogPrefCached = true;
1.482 + Preferences::AddBoolVarCache(&sShouldLog,
1.483 + "layers.offmainthreadcomposition.log-animations");
1.484 + }
1.485 +
1.486 + return sShouldLog;
1.487 +}
1.488 +
1.489 +bool
1.490 +nsLayoutUtils::UseBackgroundNearestFiltering()
1.491 +{
1.492 + static bool sUseBackgroundNearestFilteringEnabled;
1.493 + static bool sUseBackgroundNearestFilteringPrefInitialised = false;
1.494 +
1.495 + if (!sUseBackgroundNearestFilteringPrefInitialised) {
1.496 + sUseBackgroundNearestFilteringPrefInitialised = true;
1.497 + sUseBackgroundNearestFilteringEnabled =
1.498 + Preferences::GetBool("gfx.filter.nearest.force-enabled", false);
1.499 + }
1.500 +
1.501 + return sUseBackgroundNearestFilteringEnabled;
1.502 +}
1.503 +
1.504 +bool
1.505 +nsLayoutUtils::GPUImageScalingEnabled()
1.506 +{
1.507 + static bool sGPUImageScalingEnabled;
1.508 + static bool sGPUImageScalingPrefInitialised = false;
1.509 +
1.510 + if (!sGPUImageScalingPrefInitialised) {
1.511 + sGPUImageScalingPrefInitialised = true;
1.512 + sGPUImageScalingEnabled =
1.513 + Preferences::GetBool("layout.gpu-image-scaling.enabled", false);
1.514 + }
1.515 +
1.516 + return sGPUImageScalingEnabled;
1.517 +}
1.518 +
1.519 +bool
1.520 +nsLayoutUtils::AnimatedImageLayersEnabled()
1.521 +{
1.522 + static bool sAnimatedImageLayersEnabled;
1.523 + static bool sAnimatedImageLayersPrefCached = false;
1.524 +
1.525 + if (!sAnimatedImageLayersPrefCached) {
1.526 + sAnimatedImageLayersPrefCached = true;
1.527 + Preferences::AddBoolVarCache(&sAnimatedImageLayersEnabled,
1.528 + "layout.animated-image-layers.enabled",
1.529 + false);
1.530 + }
1.531 +
1.532 + return sAnimatedImageLayersEnabled;
1.533 +}
1.534 +
1.535 +bool
1.536 +nsLayoutUtils::CSSFiltersEnabled()
1.537 +{
1.538 + static bool sCSSFiltersEnabled;
1.539 + static bool sCSSFiltersPrefCached = false;
1.540 +
1.541 + if (!sCSSFiltersPrefCached) {
1.542 + sCSSFiltersPrefCached = true;
1.543 + Preferences::AddBoolVarCache(&sCSSFiltersEnabled,
1.544 + "layout.css.filters.enabled",
1.545 + false);
1.546 + }
1.547 +
1.548 + return sCSSFiltersEnabled;
1.549 +}
1.550 +
1.551 +bool
1.552 +nsLayoutUtils::UnsetValueEnabled()
1.553 +{
1.554 + static bool sUnsetValueEnabled;
1.555 + static bool sUnsetValuePrefCached = false;
1.556 +
1.557 + if (!sUnsetValuePrefCached) {
1.558 + sUnsetValuePrefCached = true;
1.559 + Preferences::AddBoolVarCache(&sUnsetValueEnabled,
1.560 + "layout.css.unset-value.enabled",
1.561 + false);
1.562 + }
1.563 +
1.564 + return sUnsetValueEnabled;
1.565 +}
1.566 +
1.567 +bool
1.568 +nsLayoutUtils::IsTextAlignTrueValueEnabled()
1.569 +{
1.570 + static bool sTextAlignTrueValueEnabled;
1.571 + static bool sTextAlignTrueValueEnabledPrefCached = false;
1.572 +
1.573 + if (!sTextAlignTrueValueEnabledPrefCached) {
1.574 + sTextAlignTrueValueEnabledPrefCached = true;
1.575 + Preferences::AddBoolVarCache(&sTextAlignTrueValueEnabled,
1.576 + TEXT_ALIGN_TRUE_ENABLED_PREF_NAME,
1.577 + false);
1.578 + }
1.579 +
1.580 + return sTextAlignTrueValueEnabled;
1.581 +}
1.582 +
1.583 +void
1.584 +nsLayoutUtils::UnionChildOverflow(nsIFrame* aFrame,
1.585 + nsOverflowAreas& aOverflowAreas,
1.586 + FrameChildListIDs aSkipChildLists)
1.587 +{
1.588 + // Iterate over all children except pop-ups.
1.589 + FrameChildListIDs skip = aSkipChildLists |
1.590 + nsIFrame::kSelectPopupList | nsIFrame::kPopupList;
1.591 + for (nsIFrame::ChildListIterator childLists(aFrame);
1.592 + !childLists.IsDone(); childLists.Next()) {
1.593 + if (skip.Contains(childLists.CurrentID())) {
1.594 + continue;
1.595 + }
1.596 +
1.597 + nsFrameList children = childLists.CurrentList();
1.598 + for (nsFrameList::Enumerator e(children); !e.AtEnd(); e.Next()) {
1.599 + nsIFrame* child = e.get();
1.600 + nsOverflowAreas childOverflow =
1.601 + child->GetOverflowAreas() + child->GetPosition();
1.602 + aOverflowAreas.UnionWith(childOverflow);
1.603 + }
1.604 + }
1.605 +}
1.606 +
1.607 +static void DestroyViewID(void* aObject, nsIAtom* aPropertyName,
1.608 + void* aPropertyValue, void* aData)
1.609 +{
1.610 + ViewID* id = static_cast<ViewID*>(aPropertyValue);
1.611 + GetContentMap().Remove(*id);
1.612 + delete id;
1.613 +}
1.614 +
1.615 +/**
1.616 + * A namespace class for static layout utilities.
1.617 + */
1.618 +
1.619 +bool
1.620 +nsLayoutUtils::FindIDFor(const nsIContent* aContent, ViewID* aOutViewId)
1.621 +{
1.622 + void* scrollIdProperty = aContent->GetProperty(nsGkAtoms::RemoteId);
1.623 + if (scrollIdProperty) {
1.624 + *aOutViewId = *static_cast<ViewID*>(scrollIdProperty);
1.625 + return true;
1.626 + }
1.627 + return false;
1.628 +}
1.629 +
1.630 +ViewID
1.631 +nsLayoutUtils::FindOrCreateIDFor(nsIContent* aContent)
1.632 +{
1.633 + ViewID scrollId;
1.634 +
1.635 + if (!FindIDFor(aContent, &scrollId)) {
1.636 + scrollId = sScrollIdCounter++;
1.637 + aContent->SetProperty(nsGkAtoms::RemoteId, new ViewID(scrollId),
1.638 + DestroyViewID);
1.639 + GetContentMap().Put(scrollId, aContent);
1.640 + }
1.641 +
1.642 + return scrollId;
1.643 +}
1.644 +
1.645 +nsIContent*
1.646 +nsLayoutUtils::FindContentFor(ViewID aId)
1.647 +{
1.648 + NS_ABORT_IF_FALSE(aId != FrameMetrics::NULL_SCROLL_ID,
1.649 + "Cannot find a content element in map for null IDs.");
1.650 + nsIContent* content;
1.651 + bool exists = GetContentMap().Get(aId, &content);
1.652 +
1.653 + if (exists) {
1.654 + return content;
1.655 + } else {
1.656 + return nullptr;
1.657 + }
1.658 +}
1.659 +
1.660 +nsIScrollableFrame*
1.661 +nsLayoutUtils::FindScrollableFrameFor(ViewID aId)
1.662 +{
1.663 + nsIContent* content = FindContentFor(aId);
1.664 + if (!content) {
1.665 + return nullptr;
1.666 + }
1.667 +
1.668 + nsIFrame* scrolledFrame = content->GetPrimaryFrame();
1.669 + if (scrolledFrame && content->OwnerDoc()->GetRootElement() == content) {
1.670 + // The content is the root element of a subdocument, so return the root scrollable
1.671 + // for the subdocument.
1.672 + scrolledFrame = scrolledFrame->PresContext()->PresShell()->GetRootScrollFrame();
1.673 + }
1.674 + return scrolledFrame ? scrolledFrame->GetScrollTargetFrame() : nullptr;
1.675 +}
1.676 +
1.677 +bool
1.678 +nsLayoutUtils::GetDisplayPort(nsIContent* aContent, nsRect *aResult)
1.679 +{
1.680 + DisplayPortPropertyData* rectData =
1.681 + static_cast<DisplayPortPropertyData*>(aContent->GetProperty(nsGkAtoms::DisplayPort));
1.682 + DisplayPortMarginsPropertyData* marginsData =
1.683 + static_cast<DisplayPortMarginsPropertyData*>(aContent->GetProperty(nsGkAtoms::DisplayPortMargins));
1.684 + if (!rectData && !marginsData) {
1.685 + return false;
1.686 + }
1.687 +
1.688 + if (aResult) {
1.689 + if (rectData && marginsData) {
1.690 + // choose margins if equal priority
1.691 + if (rectData->mPriority > marginsData->mPriority) {
1.692 + marginsData = nullptr;
1.693 + } else {
1.694 + rectData = nullptr;
1.695 + }
1.696 + }
1.697 +
1.698 + if (rectData) {
1.699 + *aResult = rectData->mRect;
1.700 + } else {
1.701 + nsRect* baseData =
1.702 + static_cast<nsRect*>(aContent->GetProperty(nsGkAtoms::DisplayPortBase));
1.703 + nsRect base;
1.704 + if (baseData) {
1.705 + base = *baseData;
1.706 + }
1.707 +
1.708 + nsIFrame* frame = aContent->GetPrimaryFrame();
1.709 + if (frame) {
1.710 + bool isRoot = false;
1.711 + if (aContent->OwnerDoc()->GetRootElement() == aContent) {
1.712 + // We want the scroll frame, the root scroll frame differs from all
1.713 + // others in that the primary frame is not the scroll frame.
1.714 + frame = frame->PresContext()->PresShell()->GetRootScrollFrame();
1.715 + isRoot = true;
1.716 + }
1.717 +
1.718 + // first convert the base rect to layer pixels
1.719 + nsPresContext* presContext = frame->PresContext();
1.720 + int32_t auPerDevPixel = presContext->AppUnitsPerDevPixel();
1.721 + gfxSize res = presContext->PresShell()->GetCumulativeResolution();
1.722 + gfxSize parentRes = res;
1.723 + if (isRoot) {
1.724 + // the base rect for root scroll frames is specified in the parent document
1.725 + // coordinate space, so it doesn't include the local resolution.
1.726 + gfxSize localRes = presContext->PresShell()->GetResolution();
1.727 + parentRes.width /= localRes.width;
1.728 + parentRes.height /= localRes.height;
1.729 + }
1.730 + LayerRect rect;
1.731 + rect.x = parentRes.width * NSAppUnitsToFloatPixels(base.x, auPerDevPixel);
1.732 + rect.y = parentRes.height * NSAppUnitsToFloatPixels(base.y, auPerDevPixel);
1.733 + rect.width =
1.734 + parentRes.width * NSAppUnitsToFloatPixels(base.width, auPerDevPixel);
1.735 + rect.height =
1.736 + parentRes.height * NSAppUnitsToFloatPixels(base.height, auPerDevPixel);
1.737 +
1.738 + rect.Inflate(marginsData->mMargins);
1.739 +
1.740 + nsIScrollableFrame* scrollableFrame = frame->GetScrollTargetFrame();
1.741 + nsPoint scrollPos(
1.742 + scrollableFrame ? scrollableFrame->GetScrollPosition() : nsPoint(0,0));
1.743 + if (marginsData->mAlignmentX > 0 || marginsData->mAlignmentY > 0) {
1.744 + // Avoid division by zero.
1.745 + if (marginsData->mAlignmentX == 0) {
1.746 + marginsData->mAlignmentX = 1;
1.747 + }
1.748 + if (marginsData->mAlignmentY == 0) {
1.749 + marginsData->mAlignmentY = 1;
1.750 + }
1.751 +
1.752 + LayerPoint scrollPosLayer(
1.753 + res.width * NSAppUnitsToFloatPixels(scrollPos.x, auPerDevPixel),
1.754 + res.height * NSAppUnitsToFloatPixels(scrollPos.y, auPerDevPixel));
1.755 + rect += scrollPosLayer;
1.756 +
1.757 + // Inflate the rectangle by 1 so that we always push to the next tile
1.758 + // boundary. This is desirable to stop from having a rectangle with a
1.759 + // moving origin occasionally being smaller when it coincidentally lines
1.760 + // up to tile boundaries.
1.761 + rect.Inflate(1);
1.762 +
1.763 + float left =
1.764 + marginsData->mAlignmentX * floor(rect.x / marginsData->mAlignmentX);
1.765 + float top =
1.766 + marginsData->mAlignmentY * floor(rect.y / marginsData->mAlignmentY);
1.767 + float right =
1.768 + marginsData->mAlignmentX * ceil(rect.XMost() / marginsData->mAlignmentX);
1.769 + float bottom =
1.770 + marginsData->mAlignmentY * ceil(rect.YMost() / marginsData->mAlignmentY);
1.771 + rect = LayerRect(left, top, right - left, bottom - top);
1.772 + rect -= scrollPosLayer;
1.773 + }
1.774 +
1.775 + nsRect result;
1.776 + result.x = NSFloatPixelsToAppUnits(rect.x / res.width, auPerDevPixel);
1.777 + result.y = NSFloatPixelsToAppUnits(rect.y / res.height, auPerDevPixel);
1.778 + result.width =
1.779 + NSFloatPixelsToAppUnits(rect.width / res.width, auPerDevPixel);
1.780 + result.height =
1.781 + NSFloatPixelsToAppUnits(rect.height / res.height, auPerDevPixel);
1.782 +
1.783 + // Finally, clamp the display port to the expanded scrollable rect.
1.784 + nsRect expandedScrollableRect = CalculateExpandedScrollableRect(frame);
1.785 + result = expandedScrollableRect.Intersect(result + scrollPos) - scrollPos;
1.786 +
1.787 + *aResult = result;
1.788 + }
1.789 + }
1.790 + }
1.791 +
1.792 + return true;
1.793 +}
1.794 +
1.795 +void
1.796 +nsLayoutUtils::SetDisplayPortMargins(nsIContent* aContent,
1.797 + nsIPresShell* aPresShell,
1.798 + const LayerMargin& aMargins,
1.799 + uint32_t aAlignmentX,
1.800 + uint32_t aAlignmentY,
1.801 + uint32_t aPriority,
1.802 + RepaintMode aRepaintMode)
1.803 +{
1.804 + DisplayPortMarginsPropertyData* currentData =
1.805 + static_cast<DisplayPortMarginsPropertyData*>(aContent->GetProperty(nsGkAtoms::DisplayPortMargins));
1.806 + if (currentData && currentData->mPriority > aPriority) {
1.807 + return;
1.808 + }
1.809 +
1.810 + aContent->SetProperty(nsGkAtoms::DisplayPortMargins,
1.811 + new DisplayPortMarginsPropertyData(
1.812 + aMargins, aAlignmentX, aAlignmentY, aPriority),
1.813 + nsINode::DeleteProperty<DisplayPortMarginsPropertyData>);
1.814 +
1.815 + nsIFrame* rootScrollFrame = aPresShell->GetRootScrollFrame();
1.816 + if (rootScrollFrame && aContent == rootScrollFrame->GetContent()) {
1.817 + // We are setting a root displayport for a document.
1.818 + // The pres shell needs a special flag set.
1.819 + aPresShell->SetIgnoreViewportScrolling(true);
1.820 + }
1.821 +
1.822 + if (aRepaintMode == RepaintMode::Repaint) {
1.823 + nsIFrame* rootFrame = aPresShell->FrameManager()->GetRootFrame();
1.824 + if (rootFrame) {
1.825 + rootFrame->SchedulePaint();
1.826 + }
1.827 + }
1.828 +}
1.829 +
1.830 +void
1.831 +nsLayoutUtils::SetDisplayPortBase(nsIContent* aContent, const nsRect& aBase)
1.832 +{
1.833 + aContent->SetProperty(nsGkAtoms::DisplayPortBase, new nsRect(aBase),
1.834 + nsINode::DeleteProperty<nsRect>);
1.835 +}
1.836 +
1.837 +void
1.838 +nsLayoutUtils::SetDisplayPortBaseIfNotSet(nsIContent* aContent, const nsRect& aBase)
1.839 +{
1.840 + if (!aContent->GetProperty(nsGkAtoms::DisplayPortBase)) {
1.841 + SetDisplayPortBase(aContent, aBase);
1.842 + }
1.843 +}
1.844 +
1.845 +bool
1.846 +nsLayoutUtils::GetCriticalDisplayPort(nsIContent* aContent, nsRect* aResult)
1.847 +{
1.848 + void* property = aContent->GetProperty(nsGkAtoms::CriticalDisplayPort);
1.849 + if (!property) {
1.850 + return false;
1.851 + }
1.852 +
1.853 + if (aResult) {
1.854 + *aResult = *static_cast<nsRect*>(property);
1.855 + }
1.856 + return true;
1.857 +}
1.858 +
1.859 +nsIFrame*
1.860 +nsLayoutUtils::LastContinuationWithChild(nsIFrame* aFrame)
1.861 +{
1.862 + NS_PRECONDITION(aFrame, "NULL frame pointer");
1.863 + aFrame = aFrame->LastContinuation();
1.864 + while (!aFrame->GetFirstPrincipalChild() &&
1.865 + aFrame->GetPrevContinuation()) {
1.866 + aFrame = aFrame->GetPrevContinuation();
1.867 + }
1.868 + return aFrame;
1.869 +}
1.870 +
1.871 +/**
1.872 + * GetFirstChildFrame returns the first "real" child frame of a
1.873 + * given frame. It will descend down into pseudo-frames (unless the
1.874 + * pseudo-frame is the :before generated frame).
1.875 + * @param aFrame the frame
1.876 + * @param aFrame the frame's content node
1.877 + */
1.878 +static nsIFrame*
1.879 +GetFirstChildFrame(nsIFrame* aFrame,
1.880 + nsIContent* aContent)
1.881 +{
1.882 + NS_PRECONDITION(aFrame, "NULL frame pointer");
1.883 +
1.884 + // Get the first child frame
1.885 + nsIFrame* childFrame = aFrame->GetFirstPrincipalChild();
1.886 +
1.887 + // If the child frame is a pseudo-frame, then return its first child.
1.888 + // Note that the frame we create for the generated content is also a
1.889 + // pseudo-frame and so don't drill down in that case
1.890 + if (childFrame &&
1.891 + childFrame->IsPseudoFrame(aContent) &&
1.892 + !childFrame->IsGeneratedContentFrame()) {
1.893 + return GetFirstChildFrame(childFrame, aContent);
1.894 + }
1.895 +
1.896 + return childFrame;
1.897 +}
1.898 +
1.899 +/**
1.900 + * GetLastChildFrame returns the last "real" child frame of a
1.901 + * given frame. It will descend down into pseudo-frames (unless the
1.902 + * pseudo-frame is the :after generated frame).
1.903 + * @param aFrame the frame
1.904 + * @param aFrame the frame's content node
1.905 + */
1.906 +static nsIFrame*
1.907 +GetLastChildFrame(nsIFrame* aFrame,
1.908 + nsIContent* aContent)
1.909 +{
1.910 + NS_PRECONDITION(aFrame, "NULL frame pointer");
1.911 +
1.912 + // Get the last continuation frame that's a parent
1.913 + nsIFrame* lastParentContinuation =
1.914 + nsLayoutUtils::LastContinuationWithChild(aFrame);
1.915 + nsIFrame* lastChildFrame =
1.916 + lastParentContinuation->GetLastChild(nsIFrame::kPrincipalList);
1.917 + if (lastChildFrame) {
1.918 + // Get the frame's first continuation. This matters in case the frame has
1.919 + // been continued across multiple lines or split by BiDi resolution.
1.920 + lastChildFrame = lastChildFrame->FirstContinuation();
1.921 +
1.922 + // If the last child frame is a pseudo-frame, then return its last child.
1.923 + // Note that the frame we create for the generated content is also a
1.924 + // pseudo-frame and so don't drill down in that case
1.925 + if (lastChildFrame &&
1.926 + lastChildFrame->IsPseudoFrame(aContent) &&
1.927 + !lastChildFrame->IsGeneratedContentFrame()) {
1.928 + return GetLastChildFrame(lastChildFrame, aContent);
1.929 + }
1.930 +
1.931 + return lastChildFrame;
1.932 + }
1.933 +
1.934 + return nullptr;
1.935 +}
1.936 +
1.937 +//static
1.938 +FrameChildListID
1.939 +nsLayoutUtils::GetChildListNameFor(nsIFrame* aChildFrame)
1.940 +{
1.941 + nsIFrame::ChildListID id = nsIFrame::kPrincipalList;
1.942 +
1.943 + if (aChildFrame->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) {
1.944 + nsIFrame* pif = aChildFrame->GetPrevInFlow();
1.945 + if (pif->GetParent() == aChildFrame->GetParent()) {
1.946 + id = nsIFrame::kExcessOverflowContainersList;
1.947 + }
1.948 + else {
1.949 + id = nsIFrame::kOverflowContainersList;
1.950 + }
1.951 + }
1.952 + // See if the frame is moved out of the flow
1.953 + else if (aChildFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW) {
1.954 + // Look at the style information to tell
1.955 + const nsStyleDisplay* disp = aChildFrame->StyleDisplay();
1.956 +
1.957 + if (NS_STYLE_POSITION_ABSOLUTE == disp->mPosition) {
1.958 + id = nsIFrame::kAbsoluteList;
1.959 + } else if (NS_STYLE_POSITION_FIXED == disp->mPosition) {
1.960 + if (nsLayoutUtils::IsReallyFixedPos(aChildFrame)) {
1.961 + id = nsIFrame::kFixedList;
1.962 + } else {
1.963 + id = nsIFrame::kAbsoluteList;
1.964 + }
1.965 +#ifdef MOZ_XUL
1.966 + } else if (NS_STYLE_DISPLAY_POPUP == disp->mDisplay) {
1.967 + // Out-of-flows that are DISPLAY_POPUP must be kids of the root popup set
1.968 +#ifdef DEBUG
1.969 + nsIFrame* parent = aChildFrame->GetParent();
1.970 + NS_ASSERTION(parent && parent->GetType() == nsGkAtoms::popupSetFrame,
1.971 + "Unexpected parent");
1.972 +#endif // DEBUG
1.973 +
1.974 + id = nsIFrame::kPopupList;
1.975 +#endif // MOZ_XUL
1.976 + } else {
1.977 + NS_ASSERTION(aChildFrame->IsFloating(), "not a floated frame");
1.978 + id = nsIFrame::kFloatList;
1.979 + }
1.980 +
1.981 + } else {
1.982 + nsIAtom* childType = aChildFrame->GetType();
1.983 + if (nsGkAtoms::menuPopupFrame == childType) {
1.984 + nsIFrame* parent = aChildFrame->GetParent();
1.985 + MOZ_ASSERT(parent, "nsMenuPopupFrame can't be the root frame");
1.986 + if (parent) {
1.987 + if (parent->GetType() == nsGkAtoms::popupSetFrame) {
1.988 + id = nsIFrame::kPopupList;
1.989 + } else {
1.990 + nsIFrame* firstPopup = parent->GetFirstChild(nsIFrame::kPopupList);
1.991 + MOZ_ASSERT(!firstPopup || !firstPopup->GetNextSibling(),
1.992 + "We assume popupList only has one child, but it has more.");
1.993 + id = firstPopup == aChildFrame
1.994 + ? nsIFrame::kPopupList
1.995 + : nsIFrame::kPrincipalList;
1.996 + }
1.997 + } else {
1.998 + id = nsIFrame::kPrincipalList;
1.999 + }
1.1000 + } else if (nsGkAtoms::tableColGroupFrame == childType) {
1.1001 + id = nsIFrame::kColGroupList;
1.1002 + } else if (nsGkAtoms::tableCaptionFrame == childType) {
1.1003 + id = nsIFrame::kCaptionList;
1.1004 + } else {
1.1005 + id = nsIFrame::kPrincipalList;
1.1006 + }
1.1007 + }
1.1008 +
1.1009 +#ifdef DEBUG
1.1010 + // Verify that the frame is actually in that child list or in the
1.1011 + // corresponding overflow list.
1.1012 + nsIFrame* parent = aChildFrame->GetParent();
1.1013 + bool found = parent->GetChildList(id).ContainsFrame(aChildFrame);
1.1014 + if (!found) {
1.1015 + if (!(aChildFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW)) {
1.1016 + found = parent->GetChildList(nsIFrame::kOverflowList)
1.1017 + .ContainsFrame(aChildFrame);
1.1018 + }
1.1019 + else if (aChildFrame->IsFloating()) {
1.1020 + found = parent->GetChildList(nsIFrame::kOverflowOutOfFlowList)
1.1021 + .ContainsFrame(aChildFrame);
1.1022 + if (!found) {
1.1023 + found = parent->GetChildList(nsIFrame::kPushedFloatsList)
1.1024 + .ContainsFrame(aChildFrame);
1.1025 + }
1.1026 + }
1.1027 + // else it's positioned and should have been on the 'id' child list.
1.1028 + NS_POSTCONDITION(found, "not in child list");
1.1029 + }
1.1030 +#endif
1.1031 +
1.1032 + return id;
1.1033 +}
1.1034 +
1.1035 +// static
1.1036 +nsIFrame*
1.1037 +nsLayoutUtils::GetBeforeFrame(nsIFrame* aFrame)
1.1038 +{
1.1039 + NS_PRECONDITION(aFrame, "NULL frame pointer");
1.1040 + NS_ASSERTION(!aFrame->GetPrevContinuation(),
1.1041 + "aFrame must be first continuation");
1.1042 +
1.1043 + nsIFrame* cif = aFrame->GetContentInsertionFrame();
1.1044 + nsIFrame* firstFrame = GetFirstChildFrame(cif, aFrame->GetContent());
1.1045 +
1.1046 + if (firstFrame && IsGeneratedContentFor(nullptr, firstFrame,
1.1047 + nsCSSPseudoElements::before)) {
1.1048 + return firstFrame;
1.1049 + }
1.1050 +
1.1051 + return nullptr;
1.1052 +}
1.1053 +
1.1054 +// static
1.1055 +nsIFrame*
1.1056 +nsLayoutUtils::GetAfterFrame(nsIFrame* aFrame)
1.1057 +{
1.1058 + NS_PRECONDITION(aFrame, "NULL frame pointer");
1.1059 +
1.1060 + nsIFrame* cif = aFrame->GetContentInsertionFrame();
1.1061 + nsIFrame* lastFrame = GetLastChildFrame(cif, aFrame->GetContent());
1.1062 +
1.1063 + if (lastFrame && IsGeneratedContentFor(nullptr, lastFrame,
1.1064 + nsCSSPseudoElements::after)) {
1.1065 + return lastFrame;
1.1066 + }
1.1067 +
1.1068 + return nullptr;
1.1069 +}
1.1070 +
1.1071 +// static
1.1072 +nsIFrame*
1.1073 +nsLayoutUtils::GetClosestFrameOfType(nsIFrame* aFrame, nsIAtom* aFrameType)
1.1074 +{
1.1075 + for (nsIFrame* frame = aFrame; frame; frame = frame->GetParent()) {
1.1076 + if (frame->GetType() == aFrameType) {
1.1077 + return frame;
1.1078 + }
1.1079 + }
1.1080 + return nullptr;
1.1081 +}
1.1082 +
1.1083 +// static
1.1084 +nsIFrame*
1.1085 +nsLayoutUtils::GetStyleFrame(nsIFrame* aFrame)
1.1086 +{
1.1087 + if (aFrame->GetType() == nsGkAtoms::tableOuterFrame) {
1.1088 + nsIFrame* inner = aFrame->GetFirstPrincipalChild();
1.1089 + NS_ASSERTION(inner, "Outer table must have an inner");
1.1090 + return inner;
1.1091 + }
1.1092 +
1.1093 + return aFrame;
1.1094 +}
1.1095 +
1.1096 +nsIFrame*
1.1097 +nsLayoutUtils::GetStyleFrame(const nsIContent* aContent)
1.1098 +{
1.1099 + nsIFrame *frame = aContent->GetPrimaryFrame();
1.1100 + if (!frame) {
1.1101 + return nullptr;
1.1102 + }
1.1103 +
1.1104 + return nsLayoutUtils::GetStyleFrame(frame);
1.1105 +}
1.1106 +
1.1107 +nsIFrame*
1.1108 +nsLayoutUtils::GetFloatFromPlaceholder(nsIFrame* aFrame) {
1.1109 + NS_ASSERTION(nsGkAtoms::placeholderFrame == aFrame->GetType(),
1.1110 + "Must have a placeholder here");
1.1111 + if (aFrame->GetStateBits() & PLACEHOLDER_FOR_FLOAT) {
1.1112 + nsIFrame *outOfFlowFrame =
1.1113 + nsPlaceholderFrame::GetRealFrameForPlaceholder(aFrame);
1.1114 + NS_ASSERTION(outOfFlowFrame->IsFloating(),
1.1115 + "How did that happen?");
1.1116 + return outOfFlowFrame;
1.1117 + }
1.1118 +
1.1119 + return nullptr;
1.1120 +}
1.1121 +
1.1122 +// static
1.1123 +bool
1.1124 +nsLayoutUtils::IsGeneratedContentFor(nsIContent* aContent,
1.1125 + nsIFrame* aFrame,
1.1126 + nsIAtom* aPseudoElement)
1.1127 +{
1.1128 + NS_PRECONDITION(aFrame, "Must have a frame");
1.1129 + NS_PRECONDITION(aPseudoElement, "Must have a pseudo name");
1.1130 +
1.1131 + if (!aFrame->IsGeneratedContentFrame()) {
1.1132 + return false;
1.1133 + }
1.1134 + nsIFrame* parent = aFrame->GetParent();
1.1135 + NS_ASSERTION(parent, "Generated content can't be root frame");
1.1136 + if (parent->IsGeneratedContentFrame()) {
1.1137 + // Not the root of the generated content
1.1138 + return false;
1.1139 + }
1.1140 +
1.1141 + if (aContent && parent->GetContent() != aContent) {
1.1142 + return false;
1.1143 + }
1.1144 +
1.1145 + return (aFrame->GetContent()->Tag() == nsGkAtoms::mozgeneratedcontentbefore) ==
1.1146 + (aPseudoElement == nsCSSPseudoElements::before);
1.1147 +}
1.1148 +
1.1149 +// static
1.1150 +nsIFrame*
1.1151 +nsLayoutUtils::GetCrossDocParentFrame(const nsIFrame* aFrame,
1.1152 + nsPoint* aExtraOffset)
1.1153 +{
1.1154 + nsIFrame* p = aFrame->GetParent();
1.1155 + if (p)
1.1156 + return p;
1.1157 +
1.1158 + nsView* v = aFrame->GetView();
1.1159 + if (!v)
1.1160 + return nullptr;
1.1161 + v = v->GetParent(); // anonymous inner view
1.1162 + if (!v)
1.1163 + return nullptr;
1.1164 + if (aExtraOffset) {
1.1165 + *aExtraOffset += v->GetPosition();
1.1166 + }
1.1167 + v = v->GetParent(); // subdocumentframe's view
1.1168 + return v ? v->GetFrame() : nullptr;
1.1169 +}
1.1170 +
1.1171 +// static
1.1172 +bool
1.1173 +nsLayoutUtils::IsProperAncestorFrameCrossDoc(nsIFrame* aAncestorFrame, nsIFrame* aFrame,
1.1174 + nsIFrame* aCommonAncestor)
1.1175 +{
1.1176 + if (aFrame == aAncestorFrame)
1.1177 + return false;
1.1178 + return IsAncestorFrameCrossDoc(aAncestorFrame, aFrame, aCommonAncestor);
1.1179 +}
1.1180 +
1.1181 +// static
1.1182 +bool
1.1183 +nsLayoutUtils::IsAncestorFrameCrossDoc(const nsIFrame* aAncestorFrame, const nsIFrame* aFrame,
1.1184 + const nsIFrame* aCommonAncestor)
1.1185 +{
1.1186 + for (const nsIFrame* f = aFrame; f != aCommonAncestor;
1.1187 + f = GetCrossDocParentFrame(f)) {
1.1188 + if (f == aAncestorFrame)
1.1189 + return true;
1.1190 + }
1.1191 + return aCommonAncestor == aAncestorFrame;
1.1192 +}
1.1193 +
1.1194 +// static
1.1195 +bool
1.1196 +nsLayoutUtils::IsProperAncestorFrame(nsIFrame* aAncestorFrame, nsIFrame* aFrame,
1.1197 + nsIFrame* aCommonAncestor)
1.1198 +{
1.1199 + if (aFrame == aAncestorFrame)
1.1200 + return false;
1.1201 + for (nsIFrame* f = aFrame; f != aCommonAncestor; f = f->GetParent()) {
1.1202 + if (f == aAncestorFrame)
1.1203 + return true;
1.1204 + }
1.1205 + return aCommonAncestor == aAncestorFrame;
1.1206 +}
1.1207 +
1.1208 +// static
1.1209 +int32_t
1.1210 +nsLayoutUtils::DoCompareTreePosition(nsIContent* aContent1,
1.1211 + nsIContent* aContent2,
1.1212 + int32_t aIf1Ancestor,
1.1213 + int32_t aIf2Ancestor,
1.1214 + const nsIContent* aCommonAncestor)
1.1215 +{
1.1216 + NS_PRECONDITION(aContent1, "aContent1 must not be null");
1.1217 + NS_PRECONDITION(aContent2, "aContent2 must not be null");
1.1218 +
1.1219 + nsAutoTArray<nsINode*, 32> content1Ancestors;
1.1220 + nsINode* c1;
1.1221 + for (c1 = aContent1; c1 && c1 != aCommonAncestor; c1 = c1->GetParentNode()) {
1.1222 + content1Ancestors.AppendElement(c1);
1.1223 + }
1.1224 + if (!c1 && aCommonAncestor) {
1.1225 + // So, it turns out aCommonAncestor was not an ancestor of c1. Oops.
1.1226 + // Never mind. We can continue as if aCommonAncestor was null.
1.1227 + aCommonAncestor = nullptr;
1.1228 + }
1.1229 +
1.1230 + nsAutoTArray<nsINode*, 32> content2Ancestors;
1.1231 + nsINode* c2;
1.1232 + for (c2 = aContent2; c2 && c2 != aCommonAncestor; c2 = c2->GetParentNode()) {
1.1233 + content2Ancestors.AppendElement(c2);
1.1234 + }
1.1235 + if (!c2 && aCommonAncestor) {
1.1236 + // So, it turns out aCommonAncestor was not an ancestor of c2.
1.1237 + // We need to retry with no common ancestor hint.
1.1238 + return DoCompareTreePosition(aContent1, aContent2,
1.1239 + aIf1Ancestor, aIf2Ancestor, nullptr);
1.1240 + }
1.1241 +
1.1242 + int last1 = content1Ancestors.Length() - 1;
1.1243 + int last2 = content2Ancestors.Length() - 1;
1.1244 + nsINode* content1Ancestor = nullptr;
1.1245 + nsINode* content2Ancestor = nullptr;
1.1246 + while (last1 >= 0 && last2 >= 0
1.1247 + && ((content1Ancestor = content1Ancestors.ElementAt(last1)) ==
1.1248 + (content2Ancestor = content2Ancestors.ElementAt(last2)))) {
1.1249 + last1--;
1.1250 + last2--;
1.1251 + }
1.1252 +
1.1253 + if (last1 < 0) {
1.1254 + if (last2 < 0) {
1.1255 + NS_ASSERTION(aContent1 == aContent2, "internal error?");
1.1256 + return 0;
1.1257 + }
1.1258 + // aContent1 is an ancestor of aContent2
1.1259 + return aIf1Ancestor;
1.1260 + }
1.1261 +
1.1262 + if (last2 < 0) {
1.1263 + // aContent2 is an ancestor of aContent1
1.1264 + return aIf2Ancestor;
1.1265 + }
1.1266 +
1.1267 + // content1Ancestor != content2Ancestor, so they must be siblings with the same parent
1.1268 + nsINode* parent = content1Ancestor->GetParentNode();
1.1269 +#ifdef DEBUG
1.1270 + // TODO: remove the uglyness, see bug 598468.
1.1271 + NS_ASSERTION(gPreventAssertInCompareTreePosition || parent,
1.1272 + "no common ancestor at all???");
1.1273 +#endif // DEBUG
1.1274 + if (!parent) { // different documents??
1.1275 + return 0;
1.1276 + }
1.1277 +
1.1278 + int32_t index1 = parent->IndexOf(content1Ancestor);
1.1279 + int32_t index2 = parent->IndexOf(content2Ancestor);
1.1280 + if (index1 < 0 || index2 < 0) {
1.1281 + // one of them must be anonymous; we can't determine the order
1.1282 + return 0;
1.1283 + }
1.1284 +
1.1285 + return index1 - index2;
1.1286 +}
1.1287 +
1.1288 +// static
1.1289 +nsIFrame*
1.1290 +nsLayoutUtils::FillAncestors(nsIFrame* aFrame,
1.1291 + nsIFrame* aStopAtAncestor,
1.1292 + nsTArray<nsIFrame*>* aAncestors)
1.1293 +{
1.1294 + while (aFrame && aFrame != aStopAtAncestor) {
1.1295 + aAncestors->AppendElement(aFrame);
1.1296 + aFrame = nsLayoutUtils::GetParentOrPlaceholderFor(aFrame);
1.1297 + }
1.1298 + return aFrame;
1.1299 +}
1.1300 +
1.1301 +// Return true if aFrame1 is after aFrame2
1.1302 +static bool IsFrameAfter(nsIFrame* aFrame1, nsIFrame* aFrame2)
1.1303 +{
1.1304 + nsIFrame* f = aFrame2;
1.1305 + do {
1.1306 + f = f->GetNextSibling();
1.1307 + if (f == aFrame1)
1.1308 + return true;
1.1309 + } while (f);
1.1310 + return false;
1.1311 +}
1.1312 +
1.1313 +// static
1.1314 +int32_t
1.1315 +nsLayoutUtils::DoCompareTreePosition(nsIFrame* aFrame1,
1.1316 + nsIFrame* aFrame2,
1.1317 + int32_t aIf1Ancestor,
1.1318 + int32_t aIf2Ancestor,
1.1319 + nsIFrame* aCommonAncestor)
1.1320 +{
1.1321 + NS_PRECONDITION(aFrame1, "aFrame1 must not be null");
1.1322 + NS_PRECONDITION(aFrame2, "aFrame2 must not be null");
1.1323 +
1.1324 + nsAutoTArray<nsIFrame*,20> frame2Ancestors;
1.1325 + nsIFrame* nonCommonAncestor =
1.1326 + FillAncestors(aFrame2, aCommonAncestor, &frame2Ancestors);
1.1327 +
1.1328 + return DoCompareTreePosition(aFrame1, aFrame2, frame2Ancestors,
1.1329 + aIf1Ancestor, aIf2Ancestor,
1.1330 + nonCommonAncestor ? aCommonAncestor : nullptr);
1.1331 +}
1.1332 +
1.1333 +// static
1.1334 +int32_t
1.1335 +nsLayoutUtils::DoCompareTreePosition(nsIFrame* aFrame1,
1.1336 + nsIFrame* aFrame2,
1.1337 + nsTArray<nsIFrame*>& aFrame2Ancestors,
1.1338 + int32_t aIf1Ancestor,
1.1339 + int32_t aIf2Ancestor,
1.1340 + nsIFrame* aCommonAncestor)
1.1341 +{
1.1342 + NS_PRECONDITION(aFrame1, "aFrame1 must not be null");
1.1343 + NS_PRECONDITION(aFrame2, "aFrame2 must not be null");
1.1344 +
1.1345 + nsPresContext* presContext = aFrame1->PresContext();
1.1346 + if (presContext != aFrame2->PresContext()) {
1.1347 + NS_ERROR("no common ancestor at all, different documents");
1.1348 + return 0;
1.1349 + }
1.1350 +
1.1351 + nsAutoTArray<nsIFrame*,20> frame1Ancestors;
1.1352 + if (aCommonAncestor &&
1.1353 + !FillAncestors(aFrame1, aCommonAncestor, &frame1Ancestors)) {
1.1354 + // We reached the root of the frame tree ... if aCommonAncestor was set,
1.1355 + // it is wrong
1.1356 + return DoCompareTreePosition(aFrame1, aFrame2,
1.1357 + aIf1Ancestor, aIf2Ancestor, nullptr);
1.1358 + }
1.1359 +
1.1360 + int32_t last1 = int32_t(frame1Ancestors.Length()) - 1;
1.1361 + int32_t last2 = int32_t(aFrame2Ancestors.Length()) - 1;
1.1362 + while (last1 >= 0 && last2 >= 0 &&
1.1363 + frame1Ancestors[last1] == aFrame2Ancestors[last2]) {
1.1364 + last1--;
1.1365 + last2--;
1.1366 + }
1.1367 +
1.1368 + if (last1 < 0) {
1.1369 + if (last2 < 0) {
1.1370 + NS_ASSERTION(aFrame1 == aFrame2, "internal error?");
1.1371 + return 0;
1.1372 + }
1.1373 + // aFrame1 is an ancestor of aFrame2
1.1374 + return aIf1Ancestor;
1.1375 + }
1.1376 +
1.1377 + if (last2 < 0) {
1.1378 + // aFrame2 is an ancestor of aFrame1
1.1379 + return aIf2Ancestor;
1.1380 + }
1.1381 +
1.1382 + nsIFrame* ancestor1 = frame1Ancestors[last1];
1.1383 + nsIFrame* ancestor2 = aFrame2Ancestors[last2];
1.1384 + // Now we should be able to walk sibling chains to find which one is first
1.1385 + if (IsFrameAfter(ancestor2, ancestor1))
1.1386 + return -1;
1.1387 + if (IsFrameAfter(ancestor1, ancestor2))
1.1388 + return 1;
1.1389 + NS_WARNING("Frames were in different child lists???");
1.1390 + return 0;
1.1391 +}
1.1392 +
1.1393 +// static
1.1394 +nsIFrame* nsLayoutUtils::GetLastSibling(nsIFrame* aFrame) {
1.1395 + if (!aFrame) {
1.1396 + return nullptr;
1.1397 + }
1.1398 +
1.1399 + nsIFrame* next;
1.1400 + while ((next = aFrame->GetNextSibling()) != nullptr) {
1.1401 + aFrame = next;
1.1402 + }
1.1403 + return aFrame;
1.1404 +}
1.1405 +
1.1406 +// static
1.1407 +nsView*
1.1408 +nsLayoutUtils::FindSiblingViewFor(nsView* aParentView, nsIFrame* aFrame) {
1.1409 + nsIFrame* parentViewFrame = aParentView->GetFrame();
1.1410 + nsIContent* parentViewContent = parentViewFrame ? parentViewFrame->GetContent() : nullptr;
1.1411 + for (nsView* insertBefore = aParentView->GetFirstChild(); insertBefore;
1.1412 + insertBefore = insertBefore->GetNextSibling()) {
1.1413 + nsIFrame* f = insertBefore->GetFrame();
1.1414 + if (!f) {
1.1415 + // this view could be some anonymous view attached to a meaningful parent
1.1416 + for (nsView* searchView = insertBefore->GetParent(); searchView;
1.1417 + searchView = searchView->GetParent()) {
1.1418 + f = searchView->GetFrame();
1.1419 + if (f) {
1.1420 + break;
1.1421 + }
1.1422 + }
1.1423 + NS_ASSERTION(f, "Can't find a frame anywhere!");
1.1424 + }
1.1425 + if (!f || !aFrame->GetContent() || !f->GetContent() ||
1.1426 + CompareTreePosition(aFrame->GetContent(), f->GetContent(), parentViewContent) > 0) {
1.1427 + // aFrame's content is after f's content (or we just don't know),
1.1428 + // so put our view before f's view
1.1429 + return insertBefore;
1.1430 + }
1.1431 + }
1.1432 + return nullptr;
1.1433 +}
1.1434 +
1.1435 +//static
1.1436 +nsIScrollableFrame*
1.1437 +nsLayoutUtils::GetScrollableFrameFor(const nsIFrame *aScrolledFrame)
1.1438 +{
1.1439 + nsIFrame *frame = aScrolledFrame->GetParent();
1.1440 + nsIScrollableFrame *sf = do_QueryFrame(frame);
1.1441 + return sf;
1.1442 +}
1.1443 +
1.1444 +/* static */ void
1.1445 +nsLayoutUtils::SetFixedPositionLayerData(Layer* aLayer,
1.1446 + const nsIFrame* aViewportFrame,
1.1447 + const nsRect& aAnchorRect,
1.1448 + const nsIFrame* aFixedPosFrame,
1.1449 + nsPresContext* aPresContext,
1.1450 + const ContainerLayerParameters& aContainerParameters) {
1.1451 + // Find out the rect of the viewport frame relative to the reference frame.
1.1452 + // This, in conjunction with the container scale, will correspond to the
1.1453 + // coordinate-space of the built layer.
1.1454 + float factor = aPresContext->AppUnitsPerDevPixel();
1.1455 + Rect anchorRect(NSAppUnitsToFloatPixels(aAnchorRect.x, factor) *
1.1456 + aContainerParameters.mXScale,
1.1457 + NSAppUnitsToFloatPixels(aAnchorRect.y, factor) *
1.1458 + aContainerParameters.mYScale,
1.1459 + NSAppUnitsToFloatPixels(aAnchorRect.width, factor) *
1.1460 + aContainerParameters.mXScale,
1.1461 + NSAppUnitsToFloatPixels(aAnchorRect.height, factor) *
1.1462 + aContainerParameters.mYScale);
1.1463 + // Need to transform anchorRect from the container layer's coordinate system
1.1464 + // into aLayer's coordinate system.
1.1465 + Matrix transform2d;
1.1466 + if (aLayer->GetTransform().Is2D(&transform2d)) {
1.1467 + transform2d.Invert();
1.1468 + anchorRect = transform2d.TransformBounds(anchorRect);
1.1469 + } else {
1.1470 + NS_ERROR("3D transform found between fixedpos content and its viewport (should never happen)");
1.1471 + anchorRect = Rect(0,0,0,0);
1.1472 + }
1.1473 +
1.1474 + // Work out the anchor point for this fixed position layer. We assume that
1.1475 + // any positioning set (left/top/right/bottom) indicates that the
1.1476 + // corresponding side of its container should be the anchor point,
1.1477 + // defaulting to top-left.
1.1478 + LayerPoint anchor(anchorRect.x, anchorRect.y);
1.1479 + // Make sure the layer is aware of any fixed position margins that have
1.1480 + // been set.
1.1481 + nsMargin fixedMargins = aPresContext->PresShell()->GetContentDocumentFixedPositionMargins();
1.1482 + LayerMargin fixedLayerMargins(NSAppUnitsToFloatPixels(fixedMargins.top, factor) *
1.1483 + aContainerParameters.mYScale,
1.1484 + NSAppUnitsToFloatPixels(fixedMargins.right, factor) *
1.1485 + aContainerParameters.mXScale,
1.1486 + NSAppUnitsToFloatPixels(fixedMargins.bottom, factor) *
1.1487 + aContainerParameters.mYScale,
1.1488 + NSAppUnitsToFloatPixels(fixedMargins.left, factor) *
1.1489 + aContainerParameters.mXScale);
1.1490 +
1.1491 + if (aFixedPosFrame != aViewportFrame) {
1.1492 + const nsStylePosition* position = aFixedPosFrame->StylePosition();
1.1493 + if (position->mOffset.GetRightUnit() != eStyleUnit_Auto) {
1.1494 + if (position->mOffset.GetLeftUnit() != eStyleUnit_Auto) {
1.1495 + anchor.x = anchorRect.x + anchorRect.width / 2.f;
1.1496 + } else {
1.1497 + anchor.x = anchorRect.XMost();
1.1498 + }
1.1499 + }
1.1500 + if (position->mOffset.GetBottomUnit() != eStyleUnit_Auto) {
1.1501 + if (position->mOffset.GetTopUnit() != eStyleUnit_Auto) {
1.1502 + anchor.y = anchorRect.y + anchorRect.height / 2.f;
1.1503 + } else {
1.1504 + anchor.y = anchorRect.YMost();
1.1505 + }
1.1506 + }
1.1507 +
1.1508 + // If the frame is auto-positioned on either axis, set the top/left layer
1.1509 + // margins to -1, to indicate to the compositor that this layer is
1.1510 + // unaffected by fixed margins.
1.1511 + if (position->mOffset.GetLeftUnit() == eStyleUnit_Auto &&
1.1512 + position->mOffset.GetRightUnit() == eStyleUnit_Auto) {
1.1513 + fixedLayerMargins.left = -1;
1.1514 + }
1.1515 + if (position->mOffset.GetTopUnit() == eStyleUnit_Auto &&
1.1516 + position->mOffset.GetBottomUnit() == eStyleUnit_Auto) {
1.1517 + fixedLayerMargins.top = -1;
1.1518 + }
1.1519 + }
1.1520 +
1.1521 + aLayer->SetFixedPositionAnchor(anchor);
1.1522 + aLayer->SetFixedPositionMargins(fixedLayerMargins);
1.1523 +}
1.1524 +
1.1525 +bool
1.1526 +nsLayoutUtils::ViewportHasDisplayPort(nsPresContext* aPresContext, nsRect* aDisplayPort)
1.1527 +{
1.1528 + nsIFrame* rootScrollFrame =
1.1529 + aPresContext->PresShell()->GetRootScrollFrame();
1.1530 + return rootScrollFrame &&
1.1531 + nsLayoutUtils::GetDisplayPort(rootScrollFrame->GetContent(), aDisplayPort);
1.1532 +}
1.1533 +
1.1534 +bool
1.1535 +nsLayoutUtils::IsFixedPosFrameInDisplayPort(const nsIFrame* aFrame, nsRect* aDisplayPort)
1.1536 +{
1.1537 + // Fixed-pos frames are parented by the viewport frame or the page content frame.
1.1538 + // We'll assume that printing/print preview don't have displayports for their
1.1539 + // pages!
1.1540 + nsIFrame* parent = aFrame->GetParent();
1.1541 + if (!parent || parent->GetParent() ||
1.1542 + aFrame->StyleDisplay()->mPosition != NS_STYLE_POSITION_FIXED) {
1.1543 + return false;
1.1544 + }
1.1545 + return ViewportHasDisplayPort(aFrame->PresContext(), aDisplayPort);
1.1546 +}
1.1547 +
1.1548 +static nsIFrame*
1.1549 +GetAnimatedGeometryRootForFrame(nsIFrame* aFrame,
1.1550 + const nsIFrame* aStopAtAncestor)
1.1551 +{
1.1552 + nsIFrame* f = aFrame;
1.1553 + nsIFrame* stickyFrame = nullptr;
1.1554 + while (f != aStopAtAncestor) {
1.1555 + if (nsLayoutUtils::IsPopup(f))
1.1556 + break;
1.1557 + if (ActiveLayerTracker::IsOffsetOrMarginStyleAnimated(f))
1.1558 + break;
1.1559 + if (!f->GetParent() &&
1.1560 + nsLayoutUtils::ViewportHasDisplayPort(f->PresContext())) {
1.1561 + // Viewport frames in a display port need to be animated geometry roots
1.1562 + // for background-attachment:fixed elements.
1.1563 + break;
1.1564 + }
1.1565 + nsIFrame* parent = nsLayoutUtils::GetCrossDocParentFrame(f);
1.1566 + if (!parent)
1.1567 + break;
1.1568 + nsIAtom* parentType = parent->GetType();
1.1569 +#ifdef ANDROID
1.1570 + // Treat the slider thumb as being as an active scrolled root
1.1571 + // on mobile so that it can move without repainting.
1.1572 + if (parentType == nsGkAtoms::sliderFrame)
1.1573 + break;
1.1574 +#endif
1.1575 + // Sticky frames are active if their nearest scrollable frame
1.1576 + // is also active, just keep a record of sticky frames that we
1.1577 + // encounter for now.
1.1578 + if (f->StyleDisplay()->mPosition == NS_STYLE_POSITION_STICKY &&
1.1579 + !stickyFrame) {
1.1580 + stickyFrame = f;
1.1581 + }
1.1582 + if (parentType == nsGkAtoms::scrollFrame) {
1.1583 + nsIScrollableFrame* sf = do_QueryFrame(parent);
1.1584 + if (sf->IsScrollingActive() && sf->GetScrolledFrame() == f) {
1.1585 + // If we found a sticky frame inside this active scroll frame,
1.1586 + // then use that. Otherwise use the scroll frame.
1.1587 + if (stickyFrame) {
1.1588 + return stickyFrame;
1.1589 + }
1.1590 + return f;
1.1591 + } else {
1.1592 + stickyFrame = nullptr;
1.1593 + }
1.1594 + }
1.1595 + // Fixed-pos frames are parented by the viewport frame, which has no parent
1.1596 + if (nsLayoutUtils::IsFixedPosFrameInDisplayPort(f)) {
1.1597 + return f;
1.1598 + }
1.1599 + f = parent;
1.1600 + }
1.1601 + return f;
1.1602 +}
1.1603 +
1.1604 +nsIFrame*
1.1605 +nsLayoutUtils::GetAnimatedGeometryRootFor(nsDisplayItem* aItem,
1.1606 + nsDisplayListBuilder* aBuilder)
1.1607 +{
1.1608 + nsIFrame* f = aItem->Frame();
1.1609 + if (aItem->GetType() == nsDisplayItem::TYPE_SCROLL_LAYER) {
1.1610 + nsDisplayScrollLayer* scrollLayerItem =
1.1611 + static_cast<nsDisplayScrollLayer*>(aItem);
1.1612 + nsIFrame* scrolledFrame = scrollLayerItem->GetScrolledFrame();
1.1613 + return GetAnimatedGeometryRootForFrame(scrolledFrame,
1.1614 + aBuilder->FindReferenceFrameFor(scrolledFrame));
1.1615 + }
1.1616 + if (aItem->ShouldFixToViewport(aBuilder)) {
1.1617 + // Make its active scrolled root be the active scrolled root of
1.1618 + // the enclosing viewport, since it shouldn't be scrolled by scrolled
1.1619 + // frames in its document. InvalidateFixedBackgroundFramesFromList in
1.1620 + // nsGfxScrollFrame will not repaint this item when scrolling occurs.
1.1621 + nsIFrame* viewportFrame =
1.1622 + nsLayoutUtils::GetClosestFrameOfType(f, nsGkAtoms::viewportFrame);
1.1623 + NS_ASSERTION(viewportFrame, "no viewport???");
1.1624 + return GetAnimatedGeometryRootForFrame(viewportFrame,
1.1625 + aBuilder->FindReferenceFrameFor(viewportFrame));
1.1626 + }
1.1627 + return GetAnimatedGeometryRootForFrame(f, aItem->ReferenceFrame());
1.1628 +}
1.1629 +
1.1630 +// static
1.1631 +nsIScrollableFrame*
1.1632 +nsLayoutUtils::GetNearestScrollableFrameForDirection(nsIFrame* aFrame,
1.1633 + Direction aDirection)
1.1634 +{
1.1635 + NS_ASSERTION(aFrame, "GetNearestScrollableFrameForDirection expects a non-null frame");
1.1636 + for (nsIFrame* f = aFrame; f; f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
1.1637 + nsIScrollableFrame* scrollableFrame = do_QueryFrame(f);
1.1638 + if (scrollableFrame) {
1.1639 + ScrollbarStyles ss = scrollableFrame->GetScrollbarStyles();
1.1640 + uint32_t directions = scrollableFrame->GetPerceivedScrollingDirections();
1.1641 + if (aDirection == eVertical ?
1.1642 + (ss.mVertical != NS_STYLE_OVERFLOW_HIDDEN &&
1.1643 + (directions & nsIScrollableFrame::VERTICAL)) :
1.1644 + (ss.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN &&
1.1645 + (directions & nsIScrollableFrame::HORIZONTAL)))
1.1646 + return scrollableFrame;
1.1647 + }
1.1648 + }
1.1649 + return nullptr;
1.1650 +}
1.1651 +
1.1652 +// static
1.1653 +nsIScrollableFrame*
1.1654 +nsLayoutUtils::GetNearestScrollableFrame(nsIFrame* aFrame, uint32_t aFlags)
1.1655 +{
1.1656 + NS_ASSERTION(aFrame, "GetNearestScrollableFrame expects a non-null frame");
1.1657 + for (nsIFrame* f = aFrame; f; f = (aFlags & SCROLLABLE_SAME_DOC) ?
1.1658 + f->GetParent() : nsLayoutUtils::GetCrossDocParentFrame(f)) {
1.1659 + nsIScrollableFrame* scrollableFrame = do_QueryFrame(f);
1.1660 + if (scrollableFrame) {
1.1661 + ScrollbarStyles ss = scrollableFrame->GetScrollbarStyles();
1.1662 + if ((aFlags & SCROLLABLE_INCLUDE_HIDDEN) ||
1.1663 + ss.mVertical != NS_STYLE_OVERFLOW_HIDDEN ||
1.1664 + ss.mHorizontal != NS_STYLE_OVERFLOW_HIDDEN)
1.1665 + return scrollableFrame;
1.1666 + }
1.1667 + }
1.1668 + return nullptr;
1.1669 +}
1.1670 +
1.1671 +// static
1.1672 +nsRect
1.1673 +nsLayoutUtils::GetScrolledRect(nsIFrame* aScrolledFrame,
1.1674 + const nsRect& aScrolledFrameOverflowArea,
1.1675 + const nsSize& aScrollPortSize,
1.1676 + uint8_t aDirection)
1.1677 +{
1.1678 + nscoord x1 = aScrolledFrameOverflowArea.x,
1.1679 + x2 = aScrolledFrameOverflowArea.XMost(),
1.1680 + y1 = aScrolledFrameOverflowArea.y,
1.1681 + y2 = aScrolledFrameOverflowArea.YMost();
1.1682 + if (y1 < 0) {
1.1683 + y1 = 0;
1.1684 + }
1.1685 + if (aDirection != NS_STYLE_DIRECTION_RTL) {
1.1686 + if (x1 < 0) {
1.1687 + x1 = 0;
1.1688 + }
1.1689 + } else {
1.1690 + if (x2 > aScrollPortSize.width) {
1.1691 + x2 = aScrollPortSize.width;
1.1692 + }
1.1693 + // When the scrolled frame chooses a size larger than its available width (because
1.1694 + // its padding alone is larger than the available width), we need to keep the
1.1695 + // start-edge of the scroll frame anchored to the start-edge of the scrollport.
1.1696 + // When the scrolled frame is RTL, this means moving it in our left-based
1.1697 + // coordinate system, so we need to compensate for its extra width here by
1.1698 + // effectively repositioning the frame.
1.1699 + nscoord extraWidth = std::max(0, aScrolledFrame->GetSize().width - aScrollPortSize.width);
1.1700 + x2 += extraWidth;
1.1701 + }
1.1702 + return nsRect(x1, y1, x2 - x1, y2 - y1);
1.1703 +}
1.1704 +
1.1705 +//static
1.1706 +bool
1.1707 +nsLayoutUtils::HasPseudoStyle(nsIContent* aContent,
1.1708 + nsStyleContext* aStyleContext,
1.1709 + nsCSSPseudoElements::Type aPseudoElement,
1.1710 + nsPresContext* aPresContext)
1.1711 +{
1.1712 + NS_PRECONDITION(aPresContext, "Must have a prescontext");
1.1713 +
1.1714 + nsRefPtr<nsStyleContext> pseudoContext;
1.1715 + if (aContent) {
1.1716 + pseudoContext = aPresContext->StyleSet()->
1.1717 + ProbePseudoElementStyle(aContent->AsElement(), aPseudoElement,
1.1718 + aStyleContext);
1.1719 + }
1.1720 + return pseudoContext != nullptr;
1.1721 +}
1.1722 +
1.1723 +nsPoint
1.1724 +nsLayoutUtils::GetDOMEventCoordinatesRelativeTo(nsIDOMEvent* aDOMEvent, nsIFrame* aFrame)
1.1725 +{
1.1726 + if (!aDOMEvent)
1.1727 + return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
1.1728 + WidgetEvent* event = aDOMEvent->GetInternalNSEvent();
1.1729 + if (!event)
1.1730 + return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
1.1731 + return GetEventCoordinatesRelativeTo(event, aFrame);
1.1732 +}
1.1733 +
1.1734 +nsPoint
1.1735 +nsLayoutUtils::GetEventCoordinatesRelativeTo(const WidgetEvent* aEvent,
1.1736 + nsIFrame* aFrame)
1.1737 +{
1.1738 + if (!aEvent || (aEvent->eventStructType != NS_MOUSE_EVENT &&
1.1739 + aEvent->eventStructType != NS_MOUSE_SCROLL_EVENT &&
1.1740 + aEvent->eventStructType != NS_WHEEL_EVENT &&
1.1741 + aEvent->eventStructType != NS_DRAG_EVENT &&
1.1742 + aEvent->eventStructType != NS_SIMPLE_GESTURE_EVENT &&
1.1743 + aEvent->eventStructType != NS_POINTER_EVENT &&
1.1744 + aEvent->eventStructType != NS_GESTURENOTIFY_EVENT &&
1.1745 + aEvent->eventStructType != NS_TOUCH_EVENT &&
1.1746 + aEvent->eventStructType != NS_QUERY_CONTENT_EVENT))
1.1747 + return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
1.1748 +
1.1749 + return GetEventCoordinatesRelativeTo(aEvent,
1.1750 + LayoutDeviceIntPoint::ToUntyped(aEvent->AsGUIEvent()->refPoint),
1.1751 + aFrame);
1.1752 +}
1.1753 +
1.1754 +nsPoint
1.1755 +nsLayoutUtils::GetEventCoordinatesRelativeTo(const WidgetEvent* aEvent,
1.1756 + const nsIntPoint aPoint,
1.1757 + nsIFrame* aFrame)
1.1758 +{
1.1759 + if (!aFrame) {
1.1760 + return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
1.1761 + }
1.1762 +
1.1763 + nsIWidget* widget = aEvent->AsGUIEvent()->widget;
1.1764 + if (!widget) {
1.1765 + return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
1.1766 + }
1.1767 +
1.1768 + return GetEventCoordinatesRelativeTo(widget, aPoint, aFrame);
1.1769 +}
1.1770 +
1.1771 +nsPoint
1.1772 +nsLayoutUtils::GetEventCoordinatesRelativeTo(nsIWidget* aWidget,
1.1773 + const nsIntPoint aPoint,
1.1774 + nsIFrame* aFrame)
1.1775 +{
1.1776 + if (!aFrame || !aWidget) {
1.1777 + return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
1.1778 + }
1.1779 +
1.1780 + nsView* view = aFrame->GetView();
1.1781 + if (view) {
1.1782 + nsIWidget* frameWidget = view->GetWidget();
1.1783 + if (frameWidget && frameWidget == aWidget) {
1.1784 + // Special case this cause it happens a lot.
1.1785 + // This also fixes bug 664707, events in the extra-special case of select
1.1786 + // dropdown popups that are transformed.
1.1787 + nsPresContext* presContext = aFrame->PresContext();
1.1788 + nsPoint pt(presContext->DevPixelsToAppUnits(aPoint.x),
1.1789 + presContext->DevPixelsToAppUnits(aPoint.y));
1.1790 + return pt - view->ViewToWidgetOffset();
1.1791 + }
1.1792 + }
1.1793 +
1.1794 + /* If we walk up the frame tree and discover that any of the frames are
1.1795 + * transformed, we need to do extra work to convert from the global
1.1796 + * space to the local space.
1.1797 + */
1.1798 + nsIFrame* rootFrame = aFrame;
1.1799 + bool transformFound = false;
1.1800 + for (nsIFrame* f = aFrame; f; f = GetCrossDocParentFrame(f)) {
1.1801 + if (f->IsTransformed()) {
1.1802 + transformFound = true;
1.1803 + }
1.1804 +
1.1805 + rootFrame = f;
1.1806 + }
1.1807 +
1.1808 + nsView* rootView = rootFrame->GetView();
1.1809 + if (!rootView) {
1.1810 + return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
1.1811 + }
1.1812 +
1.1813 + nsPoint widgetToView = TranslateWidgetToView(rootFrame->PresContext(),
1.1814 + aWidget, aPoint, rootView);
1.1815 +
1.1816 + if (widgetToView == nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE)) {
1.1817 + return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
1.1818 + }
1.1819 +
1.1820 + // Convert from root document app units to app units of the document aFrame
1.1821 + // is in.
1.1822 + int32_t rootAPD = rootFrame->PresContext()->AppUnitsPerDevPixel();
1.1823 + int32_t localAPD = aFrame->PresContext()->AppUnitsPerDevPixel();
1.1824 + widgetToView = widgetToView.ConvertAppUnits(rootAPD, localAPD);
1.1825 +
1.1826 + /* If we encountered a transform, we can't do simple arithmetic to figure
1.1827 + * out how to convert back to aFrame's coordinates and must use the CTM.
1.1828 + */
1.1829 + if (transformFound || aFrame->IsSVGText()) {
1.1830 + return TransformRootPointToFrame(aFrame, widgetToView);
1.1831 + }
1.1832 +
1.1833 + /* Otherwise, all coordinate systems are translations of one another,
1.1834 + * so we can just subtract out the difference.
1.1835 + */
1.1836 + return widgetToView - aFrame->GetOffsetToCrossDoc(rootFrame);
1.1837 +}
1.1838 +
1.1839 +nsIFrame*
1.1840 +nsLayoutUtils::GetPopupFrameForEventCoordinates(nsPresContext* aPresContext,
1.1841 + const WidgetEvent* aEvent)
1.1842 +{
1.1843 +#ifdef MOZ_XUL
1.1844 + nsXULPopupManager* pm = nsXULPopupManager::GetInstance();
1.1845 + if (!pm) {
1.1846 + return nullptr;
1.1847 + }
1.1848 + nsTArray<nsIFrame*> popups;
1.1849 + pm->GetVisiblePopups(popups);
1.1850 + uint32_t i;
1.1851 + // Search from top to bottom
1.1852 + for (i = 0; i < popups.Length(); i++) {
1.1853 + nsIFrame* popup = popups[i];
1.1854 + if (popup->PresContext()->GetRootPresContext() == aPresContext &&
1.1855 + popup->GetScrollableOverflowRect().Contains(
1.1856 + GetEventCoordinatesRelativeTo(aEvent, popup))) {
1.1857 + return popup;
1.1858 + }
1.1859 + }
1.1860 +#endif
1.1861 + return nullptr;
1.1862 +}
1.1863 +
1.1864 +gfx3DMatrix
1.1865 +nsLayoutUtils::ChangeMatrixBasis(const gfxPoint3D &aOrigin,
1.1866 + const gfx3DMatrix &aMatrix)
1.1867 +{
1.1868 + gfx3DMatrix result = aMatrix;
1.1869 +
1.1870 + /* Translate to the origin before aMatrix */
1.1871 + result.Translate(-aOrigin);
1.1872 +
1.1873 + /* Translate back into position after aMatrix */
1.1874 + result.TranslatePost(aOrigin);
1.1875 +
1.1876 + return result;
1.1877 +}
1.1878 +
1.1879 +static void ConstrainToCoordValues(float& aStart, float& aSize)
1.1880 +{
1.1881 + MOZ_ASSERT(aSize >= 0);
1.1882 +
1.1883 + // Here we try to make sure that the resulting nsRect will continue to cover
1.1884 + // as much of the area that was covered by the original gfx Rect as possible.
1.1885 +
1.1886 + // We clamp the bounds of the rect to {nscoord_MIN,nscoord_MAX} since
1.1887 + // nsRect::X/Y() and nsRect::XMost/YMost() can't return values outwith this
1.1888 + // range:
1.1889 + float end = aStart + aSize;
1.1890 + aStart = clamped(aStart, float(nscoord_MIN), float(nscoord_MAX));
1.1891 + end = clamped(end, float(nscoord_MIN), float(nscoord_MAX));
1.1892 +
1.1893 + aSize = end - aStart;
1.1894 +
1.1895 + // We must also clamp aSize to {0,nscoord_MAX} since nsRect::Width/Height()
1.1896 + // can't return a value greater than nscoord_MAX. If aSize is greater than
1.1897 + // nscoord_MAX then we reduce it to nscoord_MAX while keeping the rect
1.1898 + // centered:
1.1899 + if (aSize > nscoord_MAX) {
1.1900 + float excess = aSize - nscoord_MAX;
1.1901 + excess /= 2;
1.1902 + aStart += excess;
1.1903 + aSize = nscoord_MAX;
1.1904 + }
1.1905 +}
1.1906 +
1.1907 +/**
1.1908 + * Given a gfxFloat, constrains its value to be between nscoord_MIN and nscoord_MAX.
1.1909 + *
1.1910 + * @param aVal The value to constrain (in/out)
1.1911 + */
1.1912 +static void ConstrainToCoordValues(gfxFloat& aVal)
1.1913 +{
1.1914 + if (aVal <= nscoord_MIN)
1.1915 + aVal = nscoord_MIN;
1.1916 + else if (aVal >= nscoord_MAX)
1.1917 + aVal = nscoord_MAX;
1.1918 +}
1.1919 +
1.1920 +static void ConstrainToCoordValues(gfxFloat& aStart, gfxFloat& aSize)
1.1921 +{
1.1922 + gfxFloat max = aStart + aSize;
1.1923 +
1.1924 + // Clamp the end points to within nscoord range
1.1925 + ConstrainToCoordValues(aStart);
1.1926 + ConstrainToCoordValues(max);
1.1927 +
1.1928 + aSize = max - aStart;
1.1929 + // If the width if still greater than the max nscoord, then bring both
1.1930 + // endpoints in by the same amount until it fits.
1.1931 + if (aSize > nscoord_MAX) {
1.1932 + gfxFloat excess = aSize - nscoord_MAX;
1.1933 + excess /= 2;
1.1934 +
1.1935 + aStart += excess;
1.1936 + aSize = nscoord_MAX;
1.1937 + } else if (aSize < nscoord_MIN) {
1.1938 + gfxFloat excess = aSize - nscoord_MIN;
1.1939 + excess /= 2;
1.1940 +
1.1941 + aStart -= excess;
1.1942 + aSize = nscoord_MIN;
1.1943 + }
1.1944 +}
1.1945 +
1.1946 +nsRect
1.1947 +nsLayoutUtils::RoundGfxRectToAppRect(const Rect &aRect, float aFactor)
1.1948 +{
1.1949 + /* Get a new Rect whose units are app units by scaling by the specified factor. */
1.1950 + Rect scaledRect = aRect;
1.1951 + scaledRect.ScaleRoundOut(aFactor);
1.1952 +
1.1953 + /* We now need to constrain our results to the max and min values for coords. */
1.1954 + ConstrainToCoordValues(scaledRect.x, scaledRect.width);
1.1955 + ConstrainToCoordValues(scaledRect.y, scaledRect.height);
1.1956 +
1.1957 + /* Now typecast everything back. This is guaranteed to be safe. */
1.1958 + return nsRect(nscoord(scaledRect.X()), nscoord(scaledRect.Y()),
1.1959 + nscoord(scaledRect.Width()), nscoord(scaledRect.Height()));
1.1960 +}
1.1961 +
1.1962 +nsRect
1.1963 +nsLayoutUtils::RoundGfxRectToAppRect(const gfxRect &aRect, float aFactor)
1.1964 +{
1.1965 + /* Get a new gfxRect whose units are app units by scaling by the specified factor. */
1.1966 + gfxRect scaledRect = aRect;
1.1967 + scaledRect.ScaleRoundOut(aFactor);
1.1968 +
1.1969 + /* We now need to constrain our results to the max and min values for coords. */
1.1970 + ConstrainToCoordValues(scaledRect.x, scaledRect.width);
1.1971 + ConstrainToCoordValues(scaledRect.y, scaledRect.height);
1.1972 +
1.1973 + /* Now typecast everything back. This is guaranteed to be safe. */
1.1974 + return nsRect(nscoord(scaledRect.X()), nscoord(scaledRect.Y()),
1.1975 + nscoord(scaledRect.Width()), nscoord(scaledRect.Height()));
1.1976 +}
1.1977 +
1.1978 +
1.1979 +nsRegion
1.1980 +nsLayoutUtils::RoundedRectIntersectRect(const nsRect& aRoundedRect,
1.1981 + const nscoord aRadii[8],
1.1982 + const nsRect& aContainedRect)
1.1983 +{
1.1984 + // rectFullHeight and rectFullWidth together will approximately contain
1.1985 + // the total area of the frame minus the rounded corners.
1.1986 + nsRect rectFullHeight = aRoundedRect;
1.1987 + nscoord xDiff = std::max(aRadii[NS_CORNER_TOP_LEFT_X], aRadii[NS_CORNER_BOTTOM_LEFT_X]);
1.1988 + rectFullHeight.x += xDiff;
1.1989 + rectFullHeight.width -= std::max(aRadii[NS_CORNER_TOP_RIGHT_X],
1.1990 + aRadii[NS_CORNER_BOTTOM_RIGHT_X]) + xDiff;
1.1991 + nsRect r1;
1.1992 + r1.IntersectRect(rectFullHeight, aContainedRect);
1.1993 +
1.1994 + nsRect rectFullWidth = aRoundedRect;
1.1995 + nscoord yDiff = std::max(aRadii[NS_CORNER_TOP_LEFT_Y], aRadii[NS_CORNER_TOP_RIGHT_Y]);
1.1996 + rectFullWidth.y += yDiff;
1.1997 + rectFullWidth.height -= std::max(aRadii[NS_CORNER_BOTTOM_LEFT_Y],
1.1998 + aRadii[NS_CORNER_BOTTOM_RIGHT_Y]) + yDiff;
1.1999 + nsRect r2;
1.2000 + r2.IntersectRect(rectFullWidth, aContainedRect);
1.2001 +
1.2002 + nsRegion result;
1.2003 + result.Or(r1, r2);
1.2004 + return result;
1.2005 +}
1.2006 +
1.2007 +// Helper for RoundedRectIntersectsRect.
1.2008 +static bool
1.2009 +CheckCorner(nscoord aXOffset, nscoord aYOffset,
1.2010 + nscoord aXRadius, nscoord aYRadius)
1.2011 +{
1.2012 + NS_ABORT_IF_FALSE(aXOffset > 0 && aYOffset > 0,
1.2013 + "must not pass nonpositives to CheckCorner");
1.2014 + NS_ABORT_IF_FALSE(aXRadius >= 0 && aYRadius >= 0,
1.2015 + "must not pass negatives to CheckCorner");
1.2016 +
1.2017 + // Avoid floating point math unless we're either (1) within the
1.2018 + // quarter-ellipse area at the rounded corner or (2) outside the
1.2019 + // rounding.
1.2020 + if (aXOffset >= aXRadius || aYOffset >= aYRadius)
1.2021 + return true;
1.2022 +
1.2023 + // Convert coordinates to a unit circle with (0,0) as the center of
1.2024 + // curvature, and see if we're inside the circle or outside.
1.2025 + float scaledX = float(aXRadius - aXOffset) / float(aXRadius);
1.2026 + float scaledY = float(aYRadius - aYOffset) / float(aYRadius);
1.2027 + return scaledX * scaledX + scaledY * scaledY < 1.0f;
1.2028 +}
1.2029 +
1.2030 +bool
1.2031 +nsLayoutUtils::RoundedRectIntersectsRect(const nsRect& aRoundedRect,
1.2032 + const nscoord aRadii[8],
1.2033 + const nsRect& aTestRect)
1.2034 +{
1.2035 + if (!aTestRect.Intersects(aRoundedRect))
1.2036 + return false;
1.2037 +
1.2038 + // distances from this edge of aRoundedRect to opposite edge of aTestRect,
1.2039 + // which we know are positive due to the Intersects check above.
1.2040 + nsMargin insets;
1.2041 + insets.top = aTestRect.YMost() - aRoundedRect.y;
1.2042 + insets.right = aRoundedRect.XMost() - aTestRect.x;
1.2043 + insets.bottom = aRoundedRect.YMost() - aTestRect.y;
1.2044 + insets.left = aTestRect.XMost() - aRoundedRect.x;
1.2045 +
1.2046 + // Check whether the bottom-right corner of aTestRect is inside the
1.2047 + // top left corner of aBounds when rounded by aRadii, etc. If any
1.2048 + // corner is not, then fail; otherwise succeed.
1.2049 + return CheckCorner(insets.left, insets.top,
1.2050 + aRadii[NS_CORNER_TOP_LEFT_X],
1.2051 + aRadii[NS_CORNER_TOP_LEFT_Y]) &&
1.2052 + CheckCorner(insets.right, insets.top,
1.2053 + aRadii[NS_CORNER_TOP_RIGHT_X],
1.2054 + aRadii[NS_CORNER_TOP_RIGHT_Y]) &&
1.2055 + CheckCorner(insets.right, insets.bottom,
1.2056 + aRadii[NS_CORNER_BOTTOM_RIGHT_X],
1.2057 + aRadii[NS_CORNER_BOTTOM_RIGHT_Y]) &&
1.2058 + CheckCorner(insets.left, insets.bottom,
1.2059 + aRadii[NS_CORNER_BOTTOM_LEFT_X],
1.2060 + aRadii[NS_CORNER_BOTTOM_LEFT_Y]);
1.2061 +}
1.2062 +
1.2063 +nsRect
1.2064 +nsLayoutUtils::MatrixTransformRectOut(const nsRect &aBounds,
1.2065 + const gfx3DMatrix &aMatrix, float aFactor)
1.2066 +{
1.2067 + nsRect outside = aBounds;
1.2068 + outside.ScaleRoundOut(1/aFactor);
1.2069 + gfxRect image = aMatrix.TransformBounds(gfxRect(outside.x,
1.2070 + outside.y,
1.2071 + outside.width,
1.2072 + outside.height));
1.2073 + return RoundGfxRectToAppRect(image, aFactor);
1.2074 +}
1.2075 +
1.2076 +nsRect
1.2077 +nsLayoutUtils::MatrixTransformRect(const nsRect &aBounds,
1.2078 + const gfx3DMatrix &aMatrix, float aFactor)
1.2079 +{
1.2080 + gfxRect image = aMatrix.TransformBounds(gfxRect(NSAppUnitsToDoublePixels(aBounds.x, aFactor),
1.2081 + NSAppUnitsToDoublePixels(aBounds.y, aFactor),
1.2082 + NSAppUnitsToDoublePixels(aBounds.width, aFactor),
1.2083 + NSAppUnitsToDoublePixels(aBounds.height, aFactor)));
1.2084 +
1.2085 + return RoundGfxRectToAppRect(image, aFactor);
1.2086 +}
1.2087 +
1.2088 +nsPoint
1.2089 +nsLayoutUtils::MatrixTransformPoint(const nsPoint &aPoint,
1.2090 + const gfx3DMatrix &aMatrix, float aFactor)
1.2091 +{
1.2092 + gfxPoint image = aMatrix.Transform(gfxPoint(NSAppUnitsToFloatPixels(aPoint.x, aFactor),
1.2093 + NSAppUnitsToFloatPixels(aPoint.y, aFactor)));
1.2094 + return nsPoint(NSFloatPixelsToAppUnits(float(image.x), aFactor),
1.2095 + NSFloatPixelsToAppUnits(float(image.y), aFactor));
1.2096 +}
1.2097 +
1.2098 +gfx3DMatrix
1.2099 +nsLayoutUtils::GetTransformToAncestor(nsIFrame *aFrame, const nsIFrame *aAncestor)
1.2100 +{
1.2101 + nsIFrame* parent;
1.2102 + gfx3DMatrix ctm;
1.2103 + if (aFrame == aAncestor) {
1.2104 + return ctm;
1.2105 + }
1.2106 + ctm = aFrame->GetTransformMatrix(aAncestor, &parent);
1.2107 + while (parent && parent != aAncestor) {
1.2108 + if (!parent->Preserves3DChildren()) {
1.2109 + ctm.ProjectTo2D();
1.2110 + }
1.2111 + ctm = ctm * parent->GetTransformMatrix(aAncestor, &parent);
1.2112 + }
1.2113 + return ctm;
1.2114 +}
1.2115 +
1.2116 +static nsIFrame*
1.2117 +FindNearestCommonAncestorFrame(nsIFrame* aFrame1, nsIFrame* aFrame2)
1.2118 +{
1.2119 + nsAutoTArray<nsIFrame*,100> ancestors1;
1.2120 + nsAutoTArray<nsIFrame*,100> ancestors2;
1.2121 + nsIFrame* commonAncestor = nullptr;
1.2122 + if (aFrame1->PresContext() == aFrame2->PresContext()) {
1.2123 + commonAncestor = aFrame1->PresContext()->PresShell()->GetRootFrame();
1.2124 + }
1.2125 + for (nsIFrame* f = aFrame1; f != commonAncestor;
1.2126 + f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
1.2127 + ancestors1.AppendElement(f);
1.2128 + }
1.2129 + for (nsIFrame* f = aFrame2; f != commonAncestor;
1.2130 + f = nsLayoutUtils::GetCrossDocParentFrame(f)) {
1.2131 + ancestors2.AppendElement(f);
1.2132 + }
1.2133 + uint32_t minLengths = std::min(ancestors1.Length(), ancestors2.Length());
1.2134 + for (uint32_t i = 1; i <= minLengths; ++i) {
1.2135 + if (ancestors1[ancestors1.Length() - i] == ancestors2[ancestors2.Length() - i]) {
1.2136 + commonAncestor = ancestors1[ancestors1.Length() - i];
1.2137 + } else {
1.2138 + break;
1.2139 + }
1.2140 + }
1.2141 + return commonAncestor;
1.2142 +}
1.2143 +
1.2144 +nsLayoutUtils::TransformResult
1.2145 +nsLayoutUtils::TransformPoints(nsIFrame* aFromFrame, nsIFrame* aToFrame,
1.2146 + uint32_t aPointCount, CSSPoint* aPoints)
1.2147 +{
1.2148 + nsIFrame* nearestCommonAncestor = FindNearestCommonAncestorFrame(aFromFrame, aToFrame);
1.2149 + if (!nearestCommonAncestor) {
1.2150 + return NO_COMMON_ANCESTOR;
1.2151 + }
1.2152 + gfx3DMatrix downToDest = GetTransformToAncestor(aToFrame, nearestCommonAncestor);
1.2153 + if (downToDest.IsSingular()) {
1.2154 + return NONINVERTIBLE_TRANSFORM;
1.2155 + }
1.2156 + downToDest.Invert();
1.2157 + gfx3DMatrix upToAncestor = GetTransformToAncestor(aFromFrame, nearestCommonAncestor);
1.2158 + CSSToLayoutDeviceScale devPixelsPerCSSPixelFromFrame(
1.2159 + double(nsPresContext::AppUnitsPerCSSPixel())/
1.2160 + aFromFrame->PresContext()->AppUnitsPerDevPixel());
1.2161 + CSSToLayoutDeviceScale devPixelsPerCSSPixelToFrame(
1.2162 + double(nsPresContext::AppUnitsPerCSSPixel())/
1.2163 + aToFrame->PresContext()->AppUnitsPerDevPixel());
1.2164 + for (uint32_t i = 0; i < aPointCount; ++i) {
1.2165 + LayoutDevicePoint devPixels = aPoints[i] * devPixelsPerCSSPixelFromFrame;
1.2166 + gfxPoint toDevPixels = downToDest.ProjectPoint(
1.2167 + upToAncestor.ProjectPoint(gfxPoint(devPixels.x, devPixels.y)));
1.2168 + // Divide here so that when the devPixelsPerCSSPixels are the same, we get the correct
1.2169 + // answer instead of some inaccuracy multiplying a number by its reciprocal.
1.2170 + aPoints[i] = LayoutDevicePoint(toDevPixels.x, toDevPixels.y) /
1.2171 + devPixelsPerCSSPixelToFrame;
1.2172 + }
1.2173 + return TRANSFORM_SUCCEEDED;
1.2174 +}
1.2175 +
1.2176 +bool
1.2177 +nsLayoutUtils::GetLayerTransformForFrame(nsIFrame* aFrame,
1.2178 + gfx3DMatrix* aTransform)
1.2179 +{
1.2180 + // FIXME/bug 796690: we can sometimes compute a transform in these
1.2181 + // cases, it just increases complexity considerably. Punt for now.
1.2182 + if (aFrame->Preserves3DChildren() || aFrame->HasTransformGetter()) {
1.2183 + return false;
1.2184 + }
1.2185 +
1.2186 + nsIFrame* root = nsLayoutUtils::GetDisplayRootFrame(aFrame);
1.2187 + if (root->HasAnyStateBits(NS_FRAME_UPDATE_LAYER_TREE)) {
1.2188 + // Content may have been invalidated, so we can't reliably compute
1.2189 + // the "layer transform" in general.
1.2190 + return false;
1.2191 + }
1.2192 + // If the caller doesn't care about the value, early-return to skip
1.2193 + // overhead below.
1.2194 + if (!aTransform) {
1.2195 + return true;
1.2196 + }
1.2197 +
1.2198 + nsDisplayListBuilder builder(root, nsDisplayListBuilder::OTHER,
1.2199 + false/*don't build caret*/);
1.2200 + nsDisplayList list;
1.2201 + nsDisplayTransform* item =
1.2202 + new (&builder) nsDisplayTransform(&builder, aFrame, &list);
1.2203 +
1.2204 + *aTransform =
1.2205 + item->GetTransform();
1.2206 + item->~nsDisplayTransform();
1.2207 +
1.2208 + return true;
1.2209 +}
1.2210 +
1.2211 +static bool
1.2212 +TransformGfxPointFromAncestor(nsIFrame *aFrame,
1.2213 + const gfxPoint &aPoint,
1.2214 + nsIFrame *aAncestor,
1.2215 + gfxPoint* aOut)
1.2216 +{
1.2217 + gfx3DMatrix ctm = nsLayoutUtils::GetTransformToAncestor(aFrame, aAncestor);
1.2218 +
1.2219 + float factor = aFrame->PresContext()->AppUnitsPerDevPixel();
1.2220 + nsRect childBounds = aFrame->GetVisualOverflowRectRelativeToSelf();
1.2221 + gfxRect childGfxBounds(NSAppUnitsToFloatPixels(childBounds.x, factor),
1.2222 + NSAppUnitsToFloatPixels(childBounds.y, factor),
1.2223 + NSAppUnitsToFloatPixels(childBounds.width, factor),
1.2224 + NSAppUnitsToFloatPixels(childBounds.height, factor));
1.2225 + return ctm.UntransformPoint(aPoint, childGfxBounds, aOut);
1.2226 +}
1.2227 +
1.2228 +static gfxRect
1.2229 +TransformGfxRectToAncestor(nsIFrame *aFrame,
1.2230 + const gfxRect &aRect,
1.2231 + const nsIFrame *aAncestor,
1.2232 + bool* aPreservesAxisAlignedRectangles = nullptr)
1.2233 +{
1.2234 + gfx3DMatrix ctm = nsLayoutUtils::GetTransformToAncestor(aFrame, aAncestor);
1.2235 + if (aPreservesAxisAlignedRectangles) {
1.2236 + gfxMatrix matrix2d;
1.2237 + *aPreservesAxisAlignedRectangles =
1.2238 + ctm.Is2D(&matrix2d) && matrix2d.PreservesAxisAlignedRectangles();
1.2239 + }
1.2240 + return ctm.TransformBounds(aRect);
1.2241 +}
1.2242 +
1.2243 +static SVGTextFrame*
1.2244 +GetContainingSVGTextFrame(nsIFrame* aFrame)
1.2245 +{
1.2246 + if (!aFrame->IsSVGText()) {
1.2247 + return nullptr;
1.2248 + }
1.2249 +
1.2250 + return static_cast<SVGTextFrame*>
1.2251 + (nsLayoutUtils::GetClosestFrameOfType(aFrame->GetParent(),
1.2252 + nsGkAtoms::svgTextFrame));
1.2253 +}
1.2254 +
1.2255 +nsPoint
1.2256 +nsLayoutUtils::TransformAncestorPointToFrame(nsIFrame* aFrame,
1.2257 + const nsPoint& aPoint,
1.2258 + nsIFrame* aAncestor)
1.2259 +{
1.2260 + SVGTextFrame* text = GetContainingSVGTextFrame(aFrame);
1.2261 +
1.2262 + float factor = aFrame->PresContext()->AppUnitsPerDevPixel();
1.2263 + gfxPoint result(NSAppUnitsToFloatPixels(aPoint.x, factor),
1.2264 + NSAppUnitsToFloatPixels(aPoint.y, factor));
1.2265 +
1.2266 + if (text) {
1.2267 + if (!TransformGfxPointFromAncestor(text, result, aAncestor, &result)) {
1.2268 + return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
1.2269 + }
1.2270 + result = text->TransformFramePointToTextChild(result, aFrame);
1.2271 + } else {
1.2272 + if (!TransformGfxPointFromAncestor(aFrame, result, nullptr, &result)) {
1.2273 + return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
1.2274 + }
1.2275 + }
1.2276 +
1.2277 + return nsPoint(NSFloatPixelsToAppUnits(float(result.x), factor),
1.2278 + NSFloatPixelsToAppUnits(float(result.y), factor));
1.2279 +}
1.2280 +
1.2281 +nsRect
1.2282 +nsLayoutUtils::TransformFrameRectToAncestor(nsIFrame* aFrame,
1.2283 + const nsRect& aRect,
1.2284 + const nsIFrame* aAncestor,
1.2285 + bool* aPreservesAxisAlignedRectangles /* = nullptr */)
1.2286 +{
1.2287 + SVGTextFrame* text = GetContainingSVGTextFrame(aFrame);
1.2288 +
1.2289 + float srcAppUnitsPerDevPixel = aFrame->PresContext()->AppUnitsPerDevPixel();
1.2290 + gfxRect result;
1.2291 +
1.2292 + if (text) {
1.2293 + result = text->TransformFrameRectFromTextChild(aRect, aFrame);
1.2294 + result = TransformGfxRectToAncestor(text, result, aAncestor);
1.2295 + // TransformFrameRectFromTextChild could involve any kind of transform, we
1.2296 + // could drill down into it to get an answer out of it but we don't yet.
1.2297 + if (aPreservesAxisAlignedRectangles)
1.2298 + *aPreservesAxisAlignedRectangles = false;
1.2299 + } else {
1.2300 + result = gfxRect(NSAppUnitsToFloatPixels(aRect.x, srcAppUnitsPerDevPixel),
1.2301 + NSAppUnitsToFloatPixels(aRect.y, srcAppUnitsPerDevPixel),
1.2302 + NSAppUnitsToFloatPixels(aRect.width, srcAppUnitsPerDevPixel),
1.2303 + NSAppUnitsToFloatPixels(aRect.height, srcAppUnitsPerDevPixel));
1.2304 + result = TransformGfxRectToAncestor(aFrame, result, aAncestor, aPreservesAxisAlignedRectangles);
1.2305 + }
1.2306 +
1.2307 + float destAppUnitsPerDevPixel = aAncestor->PresContext()->AppUnitsPerDevPixel();
1.2308 + return nsRect(NSFloatPixelsToAppUnits(float(result.x), destAppUnitsPerDevPixel),
1.2309 + NSFloatPixelsToAppUnits(float(result.y), destAppUnitsPerDevPixel),
1.2310 + NSFloatPixelsToAppUnits(float(result.width), destAppUnitsPerDevPixel),
1.2311 + NSFloatPixelsToAppUnits(float(result.height), destAppUnitsPerDevPixel));
1.2312 +}
1.2313 +
1.2314 +static nsIntPoint GetWidgetOffset(nsIWidget* aWidget, nsIWidget*& aRootWidget) {
1.2315 + nsIntPoint offset(0, 0);
1.2316 + nsIWidget* parent = aWidget->GetParent();
1.2317 + while (parent) {
1.2318 + nsIntRect bounds;
1.2319 + aWidget->GetBounds(bounds);
1.2320 + offset += bounds.TopLeft();
1.2321 + aWidget = parent;
1.2322 + parent = aWidget->GetParent();
1.2323 + }
1.2324 + aRootWidget = aWidget;
1.2325 + return offset;
1.2326 +}
1.2327 +
1.2328 +nsPoint
1.2329 +nsLayoutUtils::TranslateWidgetToView(nsPresContext* aPresContext,
1.2330 + nsIWidget* aWidget, nsIntPoint aPt,
1.2331 + nsView* aView)
1.2332 +{
1.2333 + nsPoint viewOffset;
1.2334 + nsIWidget* viewWidget = aView->GetNearestWidget(&viewOffset);
1.2335 + if (!viewWidget) {
1.2336 + return nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
1.2337 + }
1.2338 +
1.2339 + nsIWidget* fromRoot;
1.2340 + nsIntPoint fromOffset = GetWidgetOffset(aWidget, fromRoot);
1.2341 + nsIWidget* toRoot;
1.2342 + nsIntPoint toOffset = GetWidgetOffset(viewWidget, toRoot);
1.2343 +
1.2344 + nsIntPoint widgetPoint;
1.2345 + if (fromRoot == toRoot) {
1.2346 + widgetPoint = aPt + fromOffset - toOffset;
1.2347 + } else {
1.2348 + nsIntPoint screenPoint = aWidget->WidgetToScreenOffset();
1.2349 + widgetPoint = aPt + screenPoint - viewWidget->WidgetToScreenOffset();
1.2350 + }
1.2351 +
1.2352 + nsPoint widgetAppUnits(aPresContext->DevPixelsToAppUnits(widgetPoint.x),
1.2353 + aPresContext->DevPixelsToAppUnits(widgetPoint.y));
1.2354 + return widgetAppUnits - viewOffset;
1.2355 +}
1.2356 +
1.2357 +// Combine aNewBreakType with aOrigBreakType, but limit the break types
1.2358 +// to NS_STYLE_CLEAR_LEFT, RIGHT, BOTH.
1.2359 +uint8_t
1.2360 +nsLayoutUtils::CombineBreakType(uint8_t aOrigBreakType,
1.2361 + uint8_t aNewBreakType)
1.2362 +{
1.2363 + uint8_t breakType = aOrigBreakType;
1.2364 + switch(breakType) {
1.2365 + case NS_STYLE_CLEAR_LEFT:
1.2366 + if (NS_STYLE_CLEAR_RIGHT == aNewBreakType ||
1.2367 + NS_STYLE_CLEAR_BOTH == aNewBreakType) {
1.2368 + breakType = NS_STYLE_CLEAR_BOTH;
1.2369 + }
1.2370 + break;
1.2371 + case NS_STYLE_CLEAR_RIGHT:
1.2372 + if (NS_STYLE_CLEAR_LEFT == aNewBreakType ||
1.2373 + NS_STYLE_CLEAR_BOTH == aNewBreakType) {
1.2374 + breakType = NS_STYLE_CLEAR_BOTH;
1.2375 + }
1.2376 + break;
1.2377 + case NS_STYLE_CLEAR_NONE:
1.2378 + if (NS_STYLE_CLEAR_LEFT == aNewBreakType ||
1.2379 + NS_STYLE_CLEAR_RIGHT == aNewBreakType ||
1.2380 + NS_STYLE_CLEAR_BOTH == aNewBreakType) {
1.2381 + breakType = aNewBreakType;
1.2382 + }
1.2383 + }
1.2384 + return breakType;
1.2385 +}
1.2386 +
1.2387 +#ifdef MOZ_DUMP_PAINTING
1.2388 +#include <stdio.h>
1.2389 +
1.2390 +static bool gDumpEventList = false;
1.2391 +int gPaintCount = 0;
1.2392 +#endif
1.2393 +
1.2394 +nsresult
1.2395 +nsLayoutUtils::GetRemoteContentIds(nsIFrame* aFrame,
1.2396 + const nsRect& aTarget,
1.2397 + nsTArray<ViewID> &aOutIDs,
1.2398 + bool aIgnoreRootScrollFrame)
1.2399 +{
1.2400 + nsDisplayListBuilder builder(aFrame, nsDisplayListBuilder::EVENT_DELIVERY,
1.2401 + false);
1.2402 + nsDisplayList list;
1.2403 +
1.2404 + if (aIgnoreRootScrollFrame) {
1.2405 + nsIFrame* rootScrollFrame =
1.2406 + aFrame->PresContext()->PresShell()->GetRootScrollFrame();
1.2407 + if (rootScrollFrame) {
1.2408 + builder.SetIgnoreScrollFrame(rootScrollFrame);
1.2409 + }
1.2410 + }
1.2411 +
1.2412 + builder.EnterPresShell(aFrame, aTarget);
1.2413 + aFrame->BuildDisplayListForStackingContext(&builder, aTarget, &list);
1.2414 + builder.LeavePresShell(aFrame, aTarget);
1.2415 +
1.2416 + nsAutoTArray<nsIFrame*,8> outFrames;
1.2417 + nsDisplayItem::HitTestState hitTestState(&aOutIDs);
1.2418 + list.HitTest(&builder, aTarget, &hitTestState, &outFrames);
1.2419 + list.DeleteAll();
1.2420 +
1.2421 + return NS_OK;
1.2422 +}
1.2423 +
1.2424 +nsIFrame*
1.2425 +nsLayoutUtils::GetFrameForPoint(nsIFrame* aFrame, nsPoint aPt, uint32_t aFlags)
1.2426 +{
1.2427 + PROFILER_LABEL("nsLayoutUtils", "GetFrameForPoint");
1.2428 + nsresult rv;
1.2429 + nsAutoTArray<nsIFrame*,8> outFrames;
1.2430 + rv = GetFramesForArea(aFrame, nsRect(aPt, nsSize(1, 1)), outFrames, aFlags);
1.2431 + NS_ENSURE_SUCCESS(rv, nullptr);
1.2432 + return outFrames.Length() ? outFrames.ElementAt(0) : nullptr;
1.2433 +}
1.2434 +
1.2435 +nsresult
1.2436 +nsLayoutUtils::GetFramesForArea(nsIFrame* aFrame, const nsRect& aRect,
1.2437 + nsTArray<nsIFrame*> &aOutFrames,
1.2438 + uint32_t aFlags)
1.2439 +{
1.2440 + PROFILER_LABEL("nsLayoutUtils","GetFramesForArea");
1.2441 + nsDisplayListBuilder builder(aFrame, nsDisplayListBuilder::EVENT_DELIVERY,
1.2442 + false);
1.2443 + nsDisplayList list;
1.2444 + nsRect target(aRect);
1.2445 +
1.2446 + if (aFlags & IGNORE_PAINT_SUPPRESSION) {
1.2447 + builder.IgnorePaintSuppression();
1.2448 + }
1.2449 +
1.2450 + if (aFlags & IGNORE_ROOT_SCROLL_FRAME) {
1.2451 + nsIFrame* rootScrollFrame =
1.2452 + aFrame->PresContext()->PresShell()->GetRootScrollFrame();
1.2453 + if (rootScrollFrame) {
1.2454 + builder.SetIgnoreScrollFrame(rootScrollFrame);
1.2455 + }
1.2456 + }
1.2457 + if (aFlags & IGNORE_CROSS_DOC) {
1.2458 + builder.SetDescendIntoSubdocuments(false);
1.2459 + }
1.2460 +
1.2461 + builder.EnterPresShell(aFrame, target);
1.2462 + aFrame->BuildDisplayListForStackingContext(&builder, target, &list);
1.2463 + builder.LeavePresShell(aFrame, target);
1.2464 +
1.2465 +#ifdef MOZ_DUMP_PAINTING
1.2466 + if (gDumpEventList) {
1.2467 + fprintf_stderr(stderr, "Event handling --- (%d,%d):\n", aRect.x, aRect.y);
1.2468 + nsFrame::PrintDisplayList(&builder, list);
1.2469 + }
1.2470 +#endif
1.2471 +
1.2472 + nsDisplayItem::HitTestState hitTestState;
1.2473 + list.HitTest(&builder, target, &hitTestState, &aOutFrames);
1.2474 + list.DeleteAll();
1.2475 + return NS_OK;
1.2476 +}
1.2477 +
1.2478 +// This function is only used on B2G, and some compilers complain about
1.2479 +// unused static functions, so we need to #ifdef it.
1.2480 +#ifdef MOZ_WIDGET_GONK
1.2481 +// aScrollFrame and aScrollFrameAsScrollable must be non-nullptr
1.2482 +static FrameMetrics
1.2483 +CalculateFrameMetricsForDisplayPort(nsIFrame* aScrollFrame,
1.2484 + nsIScrollableFrame* aScrollFrameAsScrollable) {
1.2485 + // Calculate the metrics necessary for calculating the displayport.
1.2486 + // This code has a lot in common with the code in RecordFrameMetrics();
1.2487 + // we may want to refactor this at some point.
1.2488 + FrameMetrics metrics;
1.2489 + nsPresContext* presContext = aScrollFrame->PresContext();
1.2490 + nsIPresShell* presShell = presContext->PresShell();
1.2491 + CSSToLayoutDeviceScale deviceScale(float(nsPresContext::AppUnitsPerCSSPixel())
1.2492 + / presContext->AppUnitsPerDevPixel());
1.2493 + ParentLayerToLayerScale resolution(presShell->GetResolution().width);
1.2494 + LayoutDeviceToLayerScale cumulativeResolution(presShell->GetCumulativeResolution().width);
1.2495 +
1.2496 + metrics.mDevPixelsPerCSSPixel = deviceScale;
1.2497 + metrics.mResolution = resolution;
1.2498 + metrics.mCumulativeResolution = cumulativeResolution;
1.2499 + metrics.SetZoom(deviceScale * cumulativeResolution * LayerToScreenScale(1));
1.2500 +
1.2501 + // Only the size of the composition bounds is relevant to the
1.2502 + // displayport calculation, not its origin.
1.2503 + nsSize compositionSize = nsLayoutUtils::CalculateCompositionSizeForFrame(aScrollFrame);
1.2504 + metrics.mCompositionBounds
1.2505 + = RoundedToInt(LayoutDeviceRect::FromAppUnits(nsRect(nsPoint(0, 0), compositionSize),
1.2506 + presContext->AppUnitsPerDevPixel())
1.2507 + * (cumulativeResolution / resolution));
1.2508 +
1.2509 + // This function is used for setting a display port for subframes, so
1.2510 + // aScrollFrame will not be the root content document's root scroll frame.
1.2511 + metrics.SetRootCompositionSize(
1.2512 + nsLayoutUtils::CalculateRootCompositionSize(aScrollFrame, false, metrics));
1.2513 +
1.2514 + metrics.SetScrollOffset(CSSPoint::FromAppUnits(
1.2515 + aScrollFrameAsScrollable->GetScrollPosition()));
1.2516 +
1.2517 + metrics.mScrollableRect = CSSRect::FromAppUnits(
1.2518 + nsLayoutUtils::CalculateScrollableRectForFrame(aScrollFrameAsScrollable, nullptr));
1.2519 +
1.2520 + return metrics;
1.2521 +}
1.2522 +#endif
1.2523 +
1.2524 +bool
1.2525 +nsLayoutUtils::GetOrMaybeCreateDisplayPort(nsDisplayListBuilder& aBuilder,
1.2526 + nsIFrame* aScrollFrame,
1.2527 + nsRect aDisplayPortBase,
1.2528 + nsRect* aOutDisplayport) {
1.2529 + nsIContent* content = aScrollFrame->GetContent();
1.2530 + nsIScrollableFrame* scrollableFrame = do_QueryFrame(aScrollFrame);
1.2531 + if (!content || !scrollableFrame) {
1.2532 + return false;
1.2533 + }
1.2534 +
1.2535 + // Set the base rect. Note that this will not influence 'haveDisplayPort',
1.2536 + // which is based on either the whole rect or margins being set, but it
1.2537 + // will affect what is returned in 'aOutDisplayPort' if margins are set.
1.2538 + SetDisplayPortBase(content, aDisplayPortBase);
1.2539 +
1.2540 + bool haveDisplayPort = GetDisplayPort(content, aOutDisplayport);
1.2541 +
1.2542 +#ifdef MOZ_WIDGET_GONK
1.2543 + // On B2G, we perform an optimization where we ensure that at least one
1.2544 + // async-scrollable frame (i.e. one that WantsAsyncScroll()) has a displayport.
1.2545 + // If that's not the case yet, and we are async-scrollable, we will get a
1.2546 + // displayport.
1.2547 + // Note: we only do this in processes where we do subframe scrolling to
1.2548 + // begin with (i.e., not in the parent process on B2G).
1.2549 + if (WantSubAPZC() &&
1.2550 + !aBuilder.HaveScrollableDisplayPort() &&
1.2551 + scrollableFrame->WantAsyncScroll()) {
1.2552 +
1.2553 + // If we don't already have a displayport, calculate and set one.
1.2554 + if (!haveDisplayPort) {
1.2555 + FrameMetrics metrics = CalculateFrameMetricsForDisplayPort(aScrollFrame, scrollableFrame);
1.2556 + LayerMargin displayportMargins = AsyncPanZoomController::CalculatePendingDisplayPort(
1.2557 + metrics, ScreenPoint(0.0f, 0.0f), 0.0);
1.2558 + nsIPresShell* presShell = aScrollFrame->PresContext()->GetPresShell();
1.2559 + gfx::IntSize alignment = gfxPrefs::LayersTilesEnabled()
1.2560 + ? gfx::IntSize(gfxPrefs::LayersTileWidth(), gfxPrefs::LayersTileHeight()) :
1.2561 + gfx::IntSize(0, 0);
1.2562 + nsLayoutUtils::SetDisplayPortMargins(
1.2563 + content, presShell, displayportMargins, alignment.width,
1.2564 + alignment.height, 0, nsLayoutUtils::RepaintMode::DoNotRepaint);
1.2565 + haveDisplayPort = GetDisplayPort(content, aOutDisplayport);
1.2566 + NS_ASSERTION(haveDisplayPort, "should have a displayport after having just set it");
1.2567 + }
1.2568 +
1.2569 + // Record that the we now have a scrollable display port.
1.2570 + aBuilder.SetHaveScrollableDisplayPort();
1.2571 + }
1.2572 +#endif
1.2573 +
1.2574 + return haveDisplayPort;
1.2575 +}
1.2576 +
1.2577 +nsresult
1.2578 +nsLayoutUtils::PaintFrame(nsRenderingContext* aRenderingContext, nsIFrame* aFrame,
1.2579 + const nsRegion& aDirtyRegion, nscolor aBackstop,
1.2580 + uint32_t aFlags)
1.2581 +{
1.2582 + PROFILER_LABEL("nsLayoutUtils","PaintFrame");
1.2583 + if (aFlags & PAINT_WIDGET_LAYERS) {
1.2584 + nsView* view = aFrame->GetView();
1.2585 + if (!(view && view->GetWidget() && GetDisplayRootFrame(aFrame) == aFrame)) {
1.2586 + aFlags &= ~PAINT_WIDGET_LAYERS;
1.2587 + NS_ASSERTION(aRenderingContext, "need a rendering context");
1.2588 + }
1.2589 + }
1.2590 +
1.2591 + nsPresContext* presContext = aFrame->PresContext();
1.2592 + nsIPresShell* presShell = presContext->PresShell();
1.2593 + nsRootPresContext* rootPresContext = presContext->GetRootPresContext();
1.2594 + if (!rootPresContext) {
1.2595 + return NS_OK;
1.2596 + }
1.2597 +
1.2598 + nsDisplayListBuilder builder(aFrame, nsDisplayListBuilder::PAINTING,
1.2599 + !(aFlags & PAINT_HIDE_CARET));
1.2600 +
1.2601 + nsIFrame* rootScrollFrame = presShell->GetRootScrollFrame();
1.2602 + bool usingDisplayPort = false;
1.2603 + nsRect displayport;
1.2604 + if (rootScrollFrame && !aFrame->GetParent()) {
1.2605 + nsRect displayportBase(
1.2606 + nsPoint(0,0),
1.2607 + nsLayoutUtils::CalculateCompositionSizeForFrame(rootScrollFrame));
1.2608 + usingDisplayPort = nsLayoutUtils::GetOrMaybeCreateDisplayPort(
1.2609 + builder, rootScrollFrame, displayportBase, &displayport);
1.2610 + }
1.2611 +
1.2612 + nsRegion visibleRegion;
1.2613 + if (aFlags & PAINT_WIDGET_LAYERS) {
1.2614 + // This layer tree will be reused, so we'll need to calculate it
1.2615 + // for the whole "visible" area of the window
1.2616 + //
1.2617 + // |ignoreViewportScrolling| and |usingDisplayPort| are persistent
1.2618 + // document-rendering state. We rely on PresShell to flush
1.2619 + // retained layers as needed when that persistent state changes.
1.2620 + if (!usingDisplayPort) {
1.2621 + visibleRegion = aFrame->GetVisualOverflowRectRelativeToSelf();
1.2622 + } else {
1.2623 + visibleRegion = displayport;
1.2624 + }
1.2625 + } else {
1.2626 + visibleRegion = aDirtyRegion;
1.2627 + }
1.2628 +
1.2629 + // If we're going to display something different from what we'd normally
1.2630 + // paint in a window then we will flush out any retained layer trees before
1.2631 + // *and after* we draw.
1.2632 + bool willFlushRetainedLayers = (aFlags & PAINT_HIDE_CARET) != 0;
1.2633 +
1.2634 + nsDisplayList list;
1.2635 + if (aFlags & PAINT_IN_TRANSFORM) {
1.2636 + builder.SetInTransform(true);
1.2637 + }
1.2638 + if (aFlags & PAINT_SYNC_DECODE_IMAGES) {
1.2639 + builder.SetSyncDecodeImages(true);
1.2640 + }
1.2641 + if (aFlags & (PAINT_WIDGET_LAYERS | PAINT_TO_WINDOW)) {
1.2642 + builder.SetPaintingToWindow(true);
1.2643 + }
1.2644 + if (aFlags & PAINT_IGNORE_SUPPRESSION) {
1.2645 + builder.IgnorePaintSuppression();
1.2646 + }
1.2647 + // Windowed plugins aren't allowed in popups
1.2648 + if ((aFlags & PAINT_WIDGET_LAYERS) &&
1.2649 + !willFlushRetainedLayers &&
1.2650 + !(aFlags & PAINT_DOCUMENT_RELATIVE) &&
1.2651 + rootPresContext->NeedToComputePluginGeometryUpdates()) {
1.2652 + builder.SetWillComputePluginGeometry(true);
1.2653 + }
1.2654 + nsRect canvasArea(nsPoint(0, 0), aFrame->GetSize());
1.2655 +
1.2656 + bool ignoreViewportScrolling =
1.2657 + aFrame->GetParent() ? false : presShell->IgnoringViewportScrolling();
1.2658 + if (ignoreViewportScrolling && rootScrollFrame) {
1.2659 + nsIScrollableFrame* rootScrollableFrame =
1.2660 + presShell->GetRootScrollFrameAsScrollable();
1.2661 + if (aFlags & PAINT_DOCUMENT_RELATIVE) {
1.2662 + // Make visibleRegion and aRenderingContext relative to the
1.2663 + // scrolled frame instead of the root frame.
1.2664 + nsPoint pos = rootScrollableFrame->GetScrollPosition();
1.2665 + visibleRegion.MoveBy(-pos);
1.2666 + if (aRenderingContext) {
1.2667 + aRenderingContext->Translate(pos);
1.2668 + }
1.2669 + }
1.2670 + builder.SetIgnoreScrollFrame(rootScrollFrame);
1.2671 +
1.2672 + nsCanvasFrame* canvasFrame =
1.2673 + do_QueryFrame(rootScrollableFrame->GetScrolledFrame());
1.2674 + if (canvasFrame) {
1.2675 + // Use UnionRect here to ensure that areas where the scrollbars
1.2676 + // were are still filled with the background color.
1.2677 + canvasArea.UnionRect(canvasArea,
1.2678 + canvasFrame->CanvasArea() + builder.ToReferenceFrame(canvasFrame));
1.2679 + }
1.2680 + }
1.2681 +
1.2682 + nsRect dirtyRect = visibleRegion.GetBounds();
1.2683 + builder.EnterPresShell(aFrame, dirtyRect);
1.2684 + {
1.2685 + PROFILER_LABEL("nsLayoutUtils","PaintFrame::BuildDisplayList");
1.2686 + aFrame->BuildDisplayListForStackingContext(&builder, dirtyRect, &list);
1.2687 + }
1.2688 + const bool paintAllContinuations = aFlags & PAINT_ALL_CONTINUATIONS;
1.2689 + NS_ASSERTION(!paintAllContinuations || !aFrame->GetPrevContinuation(),
1.2690 + "If painting all continuations, the frame must be "
1.2691 + "first-continuation");
1.2692 +
1.2693 + nsIAtom* frameType = aFrame->GetType();
1.2694 +
1.2695 + if (paintAllContinuations) {
1.2696 + nsIFrame* currentFrame = aFrame;
1.2697 + while ((currentFrame = currentFrame->GetNextContinuation()) != nullptr) {
1.2698 + PROFILER_LABEL("nsLayoutUtils","PaintFrame::ContinuationsBuildDisplayList");
1.2699 + nsRect frameDirty = dirtyRect - builder.ToReferenceFrame(currentFrame);
1.2700 + currentFrame->BuildDisplayListForStackingContext(&builder,
1.2701 + frameDirty, &list);
1.2702 + }
1.2703 + }
1.2704 +
1.2705 + // For the viewport frame in print preview/page layout we want to paint
1.2706 + // the grey background behind the page, not the canvas color.
1.2707 + if (frameType == nsGkAtoms::viewportFrame &&
1.2708 + nsLayoutUtils::NeedsPrintPreviewBackground(presContext)) {
1.2709 + nsRect bounds = nsRect(builder.ToReferenceFrame(aFrame),
1.2710 + aFrame->GetSize());
1.2711 + presShell->AddPrintPreviewBackgroundItem(builder, list, aFrame, bounds);
1.2712 + } else if (frameType != nsGkAtoms::pageFrame) {
1.2713 + // For printing, this function is first called on an nsPageFrame, which
1.2714 + // creates a display list with a PageContent item. The PageContent item's
1.2715 + // paint function calls this function on the nsPageFrame's child which is
1.2716 + // an nsPageContentFrame. We only want to add the canvas background color
1.2717 + // item once, for the nsPageContentFrame.
1.2718 +
1.2719 + // Add the canvas background color to the bottom of the list. This
1.2720 + // happens after we've built the list so that AddCanvasBackgroundColorItem
1.2721 + // can monkey with the contents if necessary.
1.2722 + canvasArea.IntersectRect(canvasArea, visibleRegion.GetBounds());
1.2723 + presShell->AddCanvasBackgroundColorItem(
1.2724 + builder, list, aFrame, canvasArea, aBackstop);
1.2725 +
1.2726 + // If the passed in backstop color makes us draw something different from
1.2727 + // normal, we need to flush layers.
1.2728 + if ((aFlags & PAINT_WIDGET_LAYERS) && !willFlushRetainedLayers) {
1.2729 + nsView* view = aFrame->GetView();
1.2730 + if (view) {
1.2731 + nscolor backstop = presShell->ComputeBackstopColor(view);
1.2732 + // The PresShell's canvas background color doesn't get updated until
1.2733 + // EnterPresShell, so this check has to be done after that.
1.2734 + nscolor canvasColor = presShell->GetCanvasBackground();
1.2735 + if (NS_ComposeColors(aBackstop, canvasColor) !=
1.2736 + NS_ComposeColors(backstop, canvasColor)) {
1.2737 + willFlushRetainedLayers = true;
1.2738 + }
1.2739 + }
1.2740 + }
1.2741 + }
1.2742 +
1.2743 + builder.LeavePresShell(aFrame, dirtyRect);
1.2744 +
1.2745 + if (builder.GetHadToIgnorePaintSuppression()) {
1.2746 + willFlushRetainedLayers = true;
1.2747 + }
1.2748 +
1.2749 +#ifdef MOZ_DUMP_PAINTING
1.2750 + FILE* savedDumpFile = gfxUtils::sDumpPaintFile;
1.2751 + if (gfxUtils::sDumpPaintList || gfxUtils::sDumpPainting) {
1.2752 + if (gfxUtils::sDumpPaintingToFile) {
1.2753 + nsCString string("dump-");
1.2754 + string.AppendInt(gPaintCount);
1.2755 + string.Append(".html");
1.2756 + gfxUtils::sDumpPaintFile = fopen(string.BeginReading(), "w");
1.2757 + } else {
1.2758 + gfxUtils::sDumpPaintFile = stderr;
1.2759 + }
1.2760 + if (gfxUtils::sDumpPaintingToFile) {
1.2761 + fprintf_stderr(gfxUtils::sDumpPaintFile, "<html><head><script>var array = {}; function ViewImage(index) { window.location = array[index]; }</script></head><body>");
1.2762 + }
1.2763 + fprintf_stderr(gfxUtils::sDumpPaintFile, "Painting --- before optimization (dirty %d,%d,%d,%d):\n",
1.2764 + dirtyRect.x, dirtyRect.y, dirtyRect.width, dirtyRect.height);
1.2765 + nsFrame::PrintDisplayList(&builder, list, gfxUtils::sDumpPaintFile, gfxUtils::sDumpPaintingToFile);
1.2766 + if (gfxUtils::sDumpPaintingToFile) {
1.2767 + fprintf_stderr(gfxUtils::sDumpPaintFile, "<script>");
1.2768 + }
1.2769 + }
1.2770 +#endif
1.2771 +
1.2772 + list.ComputeVisibilityForRoot(&builder, &visibleRegion,
1.2773 + usingDisplayPort ? rootScrollFrame : nullptr);
1.2774 +
1.2775 + uint32_t flags = nsDisplayList::PAINT_DEFAULT;
1.2776 + if (aFlags & PAINT_WIDGET_LAYERS) {
1.2777 + flags |= nsDisplayList::PAINT_USE_WIDGET_LAYERS;
1.2778 + if (willFlushRetainedLayers) {
1.2779 + // The caller wanted to paint from retained layers, but set up
1.2780 + // the paint in such a way that we can't use them. We're going
1.2781 + // to display something different from what we'd normally paint
1.2782 + // in a window, so make sure we flush out any retained layer
1.2783 + // trees before *and after* we draw. Callers should be fixed to
1.2784 + // not do this.
1.2785 + NS_WARNING("Flushing retained layers!");
1.2786 + flags |= nsDisplayList::PAINT_FLUSH_LAYERS;
1.2787 + } else if (!(aFlags & PAINT_DOCUMENT_RELATIVE)) {
1.2788 + nsIWidget *widget = aFrame->GetNearestWidget();
1.2789 + if (widget) {
1.2790 + builder.SetFinalTransparentRegion(visibleRegion);
1.2791 + // If we're finished building display list items for painting of the outermost
1.2792 + // pres shell, notify the widget about any toolbars we've encountered.
1.2793 + widget->UpdateThemeGeometries(builder.GetThemeGeometries());
1.2794 + }
1.2795 + }
1.2796 + }
1.2797 + if (aFlags & PAINT_EXISTING_TRANSACTION) {
1.2798 + flags |= nsDisplayList::PAINT_EXISTING_TRANSACTION;
1.2799 + }
1.2800 + if (aFlags & PAINT_NO_COMPOSITE) {
1.2801 + flags |= nsDisplayList::PAINT_NO_COMPOSITE;
1.2802 + }
1.2803 + if (aFlags & PAINT_COMPRESSED) {
1.2804 + flags |= nsDisplayList::PAINT_COMPRESSED;
1.2805 + }
1.2806 +
1.2807 + list.PaintRoot(&builder, aRenderingContext, flags);
1.2808 +
1.2809 +#ifdef MOZ_DUMP_PAINTING
1.2810 + if (gfxUtils::sDumpPaintList || gfxUtils::sDumpPainting) {
1.2811 + if (gfxUtils::sDumpPaintingToFile) {
1.2812 + fprintf_stderr(gfxUtils::sDumpPaintFile, "</script>");
1.2813 + }
1.2814 + fprintf_stderr(gfxUtils::sDumpPaintFile, "Painting --- after optimization:\n");
1.2815 + nsFrame::PrintDisplayList(&builder, list, gfxUtils::sDumpPaintFile, gfxUtils::sDumpPaintingToFile);
1.2816 +
1.2817 + fprintf_stderr(gfxUtils::sDumpPaintFile, "Painting --- retained layer tree:\n");
1.2818 + nsIWidget* widget = aFrame->GetNearestWidget();
1.2819 + if (widget) {
1.2820 + nsRefPtr<LayerManager> layerManager = widget->GetLayerManager();
1.2821 + if (layerManager) {
1.2822 + FrameLayerBuilder::DumpRetainedLayerTree(layerManager, gfxUtils::sDumpPaintFile,
1.2823 + gfxUtils::sDumpPaintingToFile);
1.2824 + }
1.2825 + }
1.2826 + if (gfxUtils::sDumpPaintingToFile) {
1.2827 + fprintf(gfxUtils::sDumpPaintFile, "</body></html>");
1.2828 + fclose(gfxUtils::sDumpPaintFile);
1.2829 + }
1.2830 + gfxUtils::sDumpPaintFile = savedDumpFile;
1.2831 + gPaintCount++;
1.2832 + }
1.2833 +#endif
1.2834 +
1.2835 + // Update the widget's opaque region information. This sets
1.2836 + // glass boundaries on Windows. Also set up plugin clip regions and bounds.
1.2837 + if ((aFlags & PAINT_WIDGET_LAYERS) &&
1.2838 + !willFlushRetainedLayers &&
1.2839 + !(aFlags & PAINT_DOCUMENT_RELATIVE)) {
1.2840 + nsIWidget *widget = aFrame->GetNearestWidget();
1.2841 + if (widget) {
1.2842 + nsRegion excludedRegion = builder.GetExcludedGlassRegion();
1.2843 + excludedRegion.Sub(excludedRegion, visibleRegion);
1.2844 + nsIntRegion windowRegion(excludedRegion.ToNearestPixels(presContext->AppUnitsPerDevPixel()));
1.2845 + widget->UpdateOpaqueRegion(windowRegion);
1.2846 + }
1.2847 + }
1.2848 +
1.2849 + if (builder.WillComputePluginGeometry()) {
1.2850 + nsRefPtr<LayerManager> layerManager;
1.2851 + nsIWidget* widget = aFrame->GetNearestWidget();
1.2852 + if (widget) {
1.2853 + layerManager = widget->GetLayerManager();
1.2854 + }
1.2855 +
1.2856 + rootPresContext->ComputePluginGeometryUpdates(aFrame, &builder, &list);
1.2857 +
1.2858 + // We're not going to get a WillPaintWindow event here if we didn't do
1.2859 + // widget invalidation, so just apply the plugin geometry update here instead.
1.2860 + // We could instead have the compositor send back an equivalent to WillPaintWindow,
1.2861 + // but it should be close enough to now not to matter.
1.2862 + if (layerManager && !layerManager->NeedsWidgetInvalidation()) {
1.2863 + rootPresContext->ApplyPluginGeometryUpdates();
1.2864 + }
1.2865 +
1.2866 + // We told the compositor thread not to composite when it received the transaction because
1.2867 + // we wanted to update plugins first. Schedule the composite now.
1.2868 + if (layerManager) {
1.2869 + layerManager->Composite();
1.2870 + }
1.2871 + }
1.2872 +
1.2873 +
1.2874 + // Flush the list so we don't trigger the IsEmpty-on-destruction assertion
1.2875 + list.DeleteAll();
1.2876 + return NS_OK;
1.2877 +}
1.2878 +
1.2879 +/**
1.2880 + * Uses a binary search for find where the cursor falls in the line of text
1.2881 + * It also keeps track of the part of the string that has already been measured
1.2882 + * so it doesn't have to keep measuring the same text over and over
1.2883 + *
1.2884 + * @param "aBaseWidth" contains the width in twips of the portion
1.2885 + * of the text that has already been measured, and aBaseInx contains
1.2886 + * the index of the text that has already been measured.
1.2887 + *
1.2888 + * @param aTextWidth returns the (in twips) the length of the text that falls
1.2889 + * before the cursor aIndex contains the index of the text where the cursor falls
1.2890 + */
1.2891 +bool
1.2892 +nsLayoutUtils::BinarySearchForPosition(nsRenderingContext* aRendContext,
1.2893 + const char16_t* aText,
1.2894 + int32_t aBaseWidth,
1.2895 + int32_t aBaseInx,
1.2896 + int32_t aStartInx,
1.2897 + int32_t aEndInx,
1.2898 + int32_t aCursorPos,
1.2899 + int32_t& aIndex,
1.2900 + int32_t& aTextWidth)
1.2901 +{
1.2902 + int32_t range = aEndInx - aStartInx;
1.2903 + if ((range == 1) || (range == 2 && NS_IS_HIGH_SURROGATE(aText[aStartInx]))) {
1.2904 + aIndex = aStartInx + aBaseInx;
1.2905 + aTextWidth = aRendContext->GetWidth(aText, aIndex);
1.2906 + return true;
1.2907 + }
1.2908 +
1.2909 + int32_t inx = aStartInx + (range / 2);
1.2910 +
1.2911 + // Make sure we don't leave a dangling low surrogate
1.2912 + if (NS_IS_HIGH_SURROGATE(aText[inx-1]))
1.2913 + inx++;
1.2914 +
1.2915 + int32_t textWidth = aRendContext->GetWidth(aText, inx);
1.2916 +
1.2917 + int32_t fullWidth = aBaseWidth + textWidth;
1.2918 + if (fullWidth == aCursorPos) {
1.2919 + aTextWidth = textWidth;
1.2920 + aIndex = inx;
1.2921 + return true;
1.2922 + } else if (aCursorPos < fullWidth) {
1.2923 + aTextWidth = aBaseWidth;
1.2924 + if (BinarySearchForPosition(aRendContext, aText, aBaseWidth, aBaseInx, aStartInx, inx, aCursorPos, aIndex, aTextWidth)) {
1.2925 + return true;
1.2926 + }
1.2927 + } else {
1.2928 + aTextWidth = fullWidth;
1.2929 + if (BinarySearchForPosition(aRendContext, aText, aBaseWidth, aBaseInx, inx, aEndInx, aCursorPos, aIndex, aTextWidth)) {
1.2930 + return true;
1.2931 + }
1.2932 + }
1.2933 + return false;
1.2934 +}
1.2935 +
1.2936 +static void
1.2937 +AddBoxesForFrame(nsIFrame* aFrame,
1.2938 + nsLayoutUtils::BoxCallback* aCallback)
1.2939 +{
1.2940 + nsIAtom* pseudoType = aFrame->StyleContext()->GetPseudo();
1.2941 +
1.2942 + if (pseudoType == nsCSSAnonBoxes::tableOuter) {
1.2943 + AddBoxesForFrame(aFrame->GetFirstPrincipalChild(), aCallback);
1.2944 + nsIFrame* kid = aFrame->GetFirstChild(nsIFrame::kCaptionList);
1.2945 + if (kid) {
1.2946 + AddBoxesForFrame(kid, aCallback);
1.2947 + }
1.2948 + } else if (pseudoType == nsCSSAnonBoxes::mozAnonymousBlock ||
1.2949 + pseudoType == nsCSSAnonBoxes::mozAnonymousPositionedBlock ||
1.2950 + pseudoType == nsCSSAnonBoxes::mozMathMLAnonymousBlock ||
1.2951 + pseudoType == nsCSSAnonBoxes::mozXULAnonymousBlock) {
1.2952 + for (nsIFrame* kid = aFrame->GetFirstPrincipalChild(); kid; kid = kid->GetNextSibling()) {
1.2953 + AddBoxesForFrame(kid, aCallback);
1.2954 + }
1.2955 + } else {
1.2956 + aCallback->AddBox(aFrame);
1.2957 + }
1.2958 +}
1.2959 +
1.2960 +void
1.2961 +nsLayoutUtils::GetAllInFlowBoxes(nsIFrame* aFrame, BoxCallback* aCallback)
1.2962 +{
1.2963 + while (aFrame) {
1.2964 + AddBoxesForFrame(aFrame, aCallback);
1.2965 + aFrame = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(aFrame);
1.2966 + }
1.2967 +}
1.2968 +
1.2969 +nsIFrame*
1.2970 +nsLayoutUtils::GetFirstNonAnonymousFrame(nsIFrame* aFrame)
1.2971 +{
1.2972 + while (aFrame) {
1.2973 + nsIAtom* pseudoType = aFrame->StyleContext()->GetPseudo();
1.2974 +
1.2975 + if (pseudoType == nsCSSAnonBoxes::tableOuter) {
1.2976 + nsIFrame* f = GetFirstNonAnonymousFrame(aFrame->GetFirstPrincipalChild());
1.2977 + if (f) {
1.2978 + return f;
1.2979 + }
1.2980 + nsIFrame* kid = aFrame->GetFirstChild(nsIFrame::kCaptionList);
1.2981 + if (kid) {
1.2982 + f = GetFirstNonAnonymousFrame(kid);
1.2983 + if (f) {
1.2984 + return f;
1.2985 + }
1.2986 + }
1.2987 + } else if (pseudoType == nsCSSAnonBoxes::mozAnonymousBlock ||
1.2988 + pseudoType == nsCSSAnonBoxes::mozAnonymousPositionedBlock ||
1.2989 + pseudoType == nsCSSAnonBoxes::mozMathMLAnonymousBlock ||
1.2990 + pseudoType == nsCSSAnonBoxes::mozXULAnonymousBlock) {
1.2991 + for (nsIFrame* kid = aFrame->GetFirstPrincipalChild(); kid; kid = kid->GetNextSibling()) {
1.2992 + nsIFrame* f = GetFirstNonAnonymousFrame(kid);
1.2993 + if (f) {
1.2994 + return f;
1.2995 + }
1.2996 + }
1.2997 + } else {
1.2998 + return aFrame;
1.2999 + }
1.3000 +
1.3001 + aFrame = nsLayoutUtils::GetNextContinuationOrIBSplitSibling(aFrame);
1.3002 + }
1.3003 + return nullptr;
1.3004 +}
1.3005 +
1.3006 +struct BoxToRect : public nsLayoutUtils::BoxCallback {
1.3007 + nsIFrame* mRelativeTo;
1.3008 + nsLayoutUtils::RectCallback* mCallback;
1.3009 + uint32_t mFlags;
1.3010 +
1.3011 + BoxToRect(nsIFrame* aRelativeTo, nsLayoutUtils::RectCallback* aCallback,
1.3012 + uint32_t aFlags)
1.3013 + : mRelativeTo(aRelativeTo), mCallback(aCallback), mFlags(aFlags) {}
1.3014 +
1.3015 + virtual void AddBox(nsIFrame* aFrame) MOZ_OVERRIDE {
1.3016 + nsRect r;
1.3017 + nsIFrame* outer = nsSVGUtils::GetOuterSVGFrameAndCoveredRegion(aFrame, &r);
1.3018 + if (!outer) {
1.3019 + outer = aFrame;
1.3020 + switch (mFlags & nsLayoutUtils::RECTS_WHICH_BOX_MASK) {
1.3021 + case nsLayoutUtils::RECTS_USE_CONTENT_BOX:
1.3022 + r = aFrame->GetContentRectRelativeToSelf();
1.3023 + break;
1.3024 + case nsLayoutUtils::RECTS_USE_PADDING_BOX:
1.3025 + r = aFrame->GetPaddingRectRelativeToSelf();
1.3026 + break;
1.3027 + case nsLayoutUtils::RECTS_USE_MARGIN_BOX:
1.3028 + r = aFrame->GetMarginRectRelativeToSelf();
1.3029 + break;
1.3030 + default: // Use the border box
1.3031 + r = aFrame->GetRectRelativeToSelf();
1.3032 + }
1.3033 + }
1.3034 + if (mFlags & nsLayoutUtils::RECTS_ACCOUNT_FOR_TRANSFORMS) {
1.3035 + r = nsLayoutUtils::TransformFrameRectToAncestor(outer, r, mRelativeTo);
1.3036 + } else {
1.3037 + r += outer->GetOffsetTo(mRelativeTo);
1.3038 + }
1.3039 + mCallback->AddRect(r);
1.3040 + }
1.3041 +};
1.3042 +
1.3043 +void
1.3044 +nsLayoutUtils::GetAllInFlowRects(nsIFrame* aFrame, nsIFrame* aRelativeTo,
1.3045 + RectCallback* aCallback, uint32_t aFlags)
1.3046 +{
1.3047 + BoxToRect converter(aRelativeTo, aCallback, aFlags);
1.3048 + GetAllInFlowBoxes(aFrame, &converter);
1.3049 +}
1.3050 +
1.3051 +nsLayoutUtils::RectAccumulator::RectAccumulator() : mSeenFirstRect(false) {}
1.3052 +
1.3053 +void nsLayoutUtils::RectAccumulator::AddRect(const nsRect& aRect) {
1.3054 + mResultRect.UnionRect(mResultRect, aRect);
1.3055 + if (!mSeenFirstRect) {
1.3056 + mSeenFirstRect = true;
1.3057 + mFirstRect = aRect;
1.3058 + }
1.3059 +}
1.3060 +
1.3061 +nsLayoutUtils::RectListBuilder::RectListBuilder(DOMRectList* aList)
1.3062 + : mRectList(aList)
1.3063 +{
1.3064 +}
1.3065 +
1.3066 +void nsLayoutUtils::RectListBuilder::AddRect(const nsRect& aRect) {
1.3067 + nsRefPtr<DOMRect> rect = new DOMRect(mRectList);
1.3068 +
1.3069 + rect->SetLayoutRect(aRect);
1.3070 + mRectList->Append(rect);
1.3071 +}
1.3072 +
1.3073 +nsIFrame* nsLayoutUtils::GetContainingBlockForClientRect(nsIFrame* aFrame)
1.3074 +{
1.3075 + return aFrame->PresContext()->PresShell()->GetRootFrame();
1.3076 +}
1.3077 +
1.3078 +nsRect
1.3079 +nsLayoutUtils::GetAllInFlowRectsUnion(nsIFrame* aFrame, nsIFrame* aRelativeTo,
1.3080 + uint32_t aFlags) {
1.3081 + RectAccumulator accumulator;
1.3082 + GetAllInFlowRects(aFrame, aRelativeTo, &accumulator, aFlags);
1.3083 + return accumulator.mResultRect.IsEmpty() ? accumulator.mFirstRect
1.3084 + : accumulator.mResultRect;
1.3085 +}
1.3086 +
1.3087 +nsRect
1.3088 +nsLayoutUtils::GetTextShadowRectsUnion(const nsRect& aTextAndDecorationsRect,
1.3089 + nsIFrame* aFrame,
1.3090 + uint32_t aFlags)
1.3091 +{
1.3092 + const nsStyleText* textStyle = aFrame->StyleText();
1.3093 + if (!textStyle->HasTextShadow())
1.3094 + return aTextAndDecorationsRect;
1.3095 +
1.3096 + nsRect resultRect = aTextAndDecorationsRect;
1.3097 + int32_t A2D = aFrame->PresContext()->AppUnitsPerDevPixel();
1.3098 + for (uint32_t i = 0; i < textStyle->mTextShadow->Length(); ++i) {
1.3099 + nsCSSShadowItem* shadow = textStyle->mTextShadow->ShadowAt(i);
1.3100 + nsMargin blur = nsContextBoxBlur::GetBlurRadiusMargin(shadow->mRadius, A2D);
1.3101 + if ((aFlags & EXCLUDE_BLUR_SHADOWS) && blur != nsMargin(0, 0, 0, 0))
1.3102 + continue;
1.3103 +
1.3104 + nsRect tmpRect(aTextAndDecorationsRect);
1.3105 +
1.3106 + tmpRect.MoveBy(nsPoint(shadow->mXOffset, shadow->mYOffset));
1.3107 + tmpRect.Inflate(blur);
1.3108 +
1.3109 + resultRect.UnionRect(resultRect, tmpRect);
1.3110 + }
1.3111 + return resultRect;
1.3112 +}
1.3113 +
1.3114 +nsresult
1.3115 +nsLayoutUtils::GetFontMetricsForFrame(const nsIFrame* aFrame,
1.3116 + nsFontMetrics** aFontMetrics,
1.3117 + float aInflation)
1.3118 +{
1.3119 + return nsLayoutUtils::GetFontMetricsForStyleContext(aFrame->StyleContext(),
1.3120 + aFontMetrics,
1.3121 + aInflation);
1.3122 +}
1.3123 +
1.3124 +nsresult
1.3125 +nsLayoutUtils::GetFontMetricsForStyleContext(nsStyleContext* aStyleContext,
1.3126 + nsFontMetrics** aFontMetrics,
1.3127 + float aInflation)
1.3128 +{
1.3129 + // pass the user font set object into the device context to pass along to CreateFontGroup
1.3130 + nsPresContext* pc = aStyleContext->PresContext();
1.3131 + gfxUserFontSet* fs = pc->GetUserFontSet();
1.3132 + gfxTextPerfMetrics* tp = pc->GetTextPerfMetrics();
1.3133 +
1.3134 + nsFont font = aStyleContext->StyleFont()->mFont;
1.3135 + // We need to not run font.size through floats when it's large since
1.3136 + // doing so would be lossy. Fortunately, in such cases, aInflation is
1.3137 + // guaranteed to be 1.0f.
1.3138 + if (aInflation != 1.0f) {
1.3139 + font.size = NSToCoordRound(font.size * aInflation);
1.3140 + }
1.3141 + return pc->DeviceContext()->GetMetricsFor(
1.3142 + font, aStyleContext->StyleFont()->mLanguage,
1.3143 + fs, tp, *aFontMetrics);
1.3144 +}
1.3145 +
1.3146 +nsIFrame*
1.3147 +nsLayoutUtils::FindChildContainingDescendant(nsIFrame* aParent, nsIFrame* aDescendantFrame)
1.3148 +{
1.3149 + nsIFrame* result = aDescendantFrame;
1.3150 +
1.3151 + while (result) {
1.3152 + nsIFrame* parent = result->GetParent();
1.3153 + if (parent == aParent) {
1.3154 + break;
1.3155 + }
1.3156 +
1.3157 + // The frame is not an immediate child of aParent so walk up another level
1.3158 + result = parent;
1.3159 + }
1.3160 +
1.3161 + return result;
1.3162 +}
1.3163 +
1.3164 +nsBlockFrame*
1.3165 +nsLayoutUtils::GetAsBlock(nsIFrame* aFrame)
1.3166 +{
1.3167 + nsBlockFrame* block = do_QueryFrame(aFrame);
1.3168 + return block;
1.3169 +}
1.3170 +
1.3171 +nsBlockFrame*
1.3172 +nsLayoutUtils::FindNearestBlockAncestor(nsIFrame* aFrame)
1.3173 +{
1.3174 + nsIFrame* nextAncestor;
1.3175 + for (nextAncestor = aFrame->GetParent(); nextAncestor;
1.3176 + nextAncestor = nextAncestor->GetParent()) {
1.3177 + nsBlockFrame* block = GetAsBlock(nextAncestor);
1.3178 + if (block)
1.3179 + return block;
1.3180 + }
1.3181 + return nullptr;
1.3182 +}
1.3183 +
1.3184 +nsIFrame*
1.3185 +nsLayoutUtils::GetNonGeneratedAncestor(nsIFrame* aFrame)
1.3186 +{
1.3187 + if (!(aFrame->GetStateBits() & NS_FRAME_GENERATED_CONTENT))
1.3188 + return aFrame;
1.3189 +
1.3190 + nsIFrame* f = aFrame;
1.3191 + do {
1.3192 + f = GetParentOrPlaceholderFor(f);
1.3193 + } while (f->GetStateBits() & NS_FRAME_GENERATED_CONTENT);
1.3194 + return f;
1.3195 +}
1.3196 +
1.3197 +nsIFrame*
1.3198 +nsLayoutUtils::GetParentOrPlaceholderFor(nsIFrame* aFrame)
1.3199 +{
1.3200 + if ((aFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW)
1.3201 + && !aFrame->GetPrevInFlow()) {
1.3202 + return aFrame->PresContext()->PresShell()->FrameManager()->
1.3203 + GetPlaceholderFrameFor(aFrame);
1.3204 + }
1.3205 + return aFrame->GetParent();
1.3206 +}
1.3207 +
1.3208 +nsIFrame*
1.3209 +nsLayoutUtils::GetParentOrPlaceholderForCrossDoc(nsIFrame* aFrame)
1.3210 +{
1.3211 + nsIFrame* f = GetParentOrPlaceholderFor(aFrame);
1.3212 + if (f)
1.3213 + return f;
1.3214 + return GetCrossDocParentFrame(aFrame);
1.3215 +}
1.3216 +
1.3217 +nsIFrame*
1.3218 +nsLayoutUtils::GetNextContinuationOrIBSplitSibling(nsIFrame *aFrame)
1.3219 +{
1.3220 + nsIFrame *result = aFrame->GetNextContinuation();
1.3221 + if (result)
1.3222 + return result;
1.3223 +
1.3224 + if ((aFrame->GetStateBits() & NS_FRAME_PART_OF_IBSPLIT) != 0) {
1.3225 + // We only store the ib-split sibling annotation with the first
1.3226 + // frame in the continuation chain. Walk back to find that frame now.
1.3227 + aFrame = aFrame->FirstContinuation();
1.3228 +
1.3229 + void* value = aFrame->Properties().Get(nsIFrame::IBSplitSibling());
1.3230 + return static_cast<nsIFrame*>(value);
1.3231 + }
1.3232 +
1.3233 + return nullptr;
1.3234 +}
1.3235 +
1.3236 +nsIFrame*
1.3237 +nsLayoutUtils::FirstContinuationOrIBSplitSibling(nsIFrame *aFrame)
1.3238 +{
1.3239 + nsIFrame *result = aFrame->FirstContinuation();
1.3240 + if (result->GetStateBits() & NS_FRAME_PART_OF_IBSPLIT) {
1.3241 + while (true) {
1.3242 + nsIFrame *f = static_cast<nsIFrame*>
1.3243 + (result->Properties().Get(nsIFrame::IBSplitPrevSibling()));
1.3244 + if (!f)
1.3245 + break;
1.3246 + result = f;
1.3247 + }
1.3248 + }
1.3249 +
1.3250 + return result;
1.3251 +}
1.3252 +
1.3253 +bool
1.3254 +nsLayoutUtils::IsFirstContinuationOrIBSplitSibling(nsIFrame *aFrame)
1.3255 +{
1.3256 + if (aFrame->GetPrevContinuation()) {
1.3257 + return false;
1.3258 + }
1.3259 + if ((aFrame->GetStateBits() & NS_FRAME_PART_OF_IBSPLIT) &&
1.3260 + aFrame->Properties().Get(nsIFrame::IBSplitPrevSibling())) {
1.3261 + return false;
1.3262 + }
1.3263 +
1.3264 + return true;
1.3265 +}
1.3266 +
1.3267 +bool
1.3268 +nsLayoutUtils::IsViewportScrollbarFrame(nsIFrame* aFrame)
1.3269 +{
1.3270 + if (!aFrame)
1.3271 + return false;
1.3272 +
1.3273 + nsIFrame* rootScrollFrame =
1.3274 + aFrame->PresContext()->PresShell()->GetRootScrollFrame();
1.3275 + if (!rootScrollFrame)
1.3276 + return false;
1.3277 +
1.3278 + nsIScrollableFrame* rootScrollableFrame = do_QueryFrame(rootScrollFrame);
1.3279 + NS_ASSERTION(rootScrollableFrame, "The root scorollable frame is null");
1.3280 +
1.3281 + if (!IsProperAncestorFrame(rootScrollFrame, aFrame))
1.3282 + return false;
1.3283 +
1.3284 + nsIFrame* rootScrolledFrame = rootScrollableFrame->GetScrolledFrame();
1.3285 + return !(rootScrolledFrame == aFrame ||
1.3286 + IsProperAncestorFrame(rootScrolledFrame, aFrame));
1.3287 +}
1.3288 +
1.3289 +static nscoord AddPercents(nsLayoutUtils::IntrinsicWidthType aType,
1.3290 + nscoord aCurrent, float aPercent)
1.3291 +{
1.3292 + nscoord result = aCurrent;
1.3293 + if (aPercent > 0.0f && aType == nsLayoutUtils::PREF_WIDTH) {
1.3294 + // XXX Should we also consider percentages for min widths, up to a
1.3295 + // limit?
1.3296 + if (aPercent >= 1.0f)
1.3297 + result = nscoord_MAX;
1.3298 + else
1.3299 + result = NSToCoordRound(float(result) / (1.0f - aPercent));
1.3300 + }
1.3301 + return result;
1.3302 +}
1.3303 +
1.3304 +// Use only for widths/heights (or their min/max), since it clamps
1.3305 +// negative calc() results to 0.
1.3306 +static bool GetAbsoluteCoord(const nsStyleCoord& aStyle, nscoord& aResult)
1.3307 +{
1.3308 + if (aStyle.IsCalcUnit()) {
1.3309 + if (aStyle.CalcHasPercent()) {
1.3310 + return false;
1.3311 + }
1.3312 + // If it has no percents, we can pass 0 for the percentage basis.
1.3313 + aResult = nsRuleNode::ComputeComputedCalc(aStyle, 0);
1.3314 + if (aResult < 0)
1.3315 + aResult = 0;
1.3316 + return true;
1.3317 + }
1.3318 +
1.3319 + if (eStyleUnit_Coord != aStyle.GetUnit())
1.3320 + return false;
1.3321 +
1.3322 + aResult = aStyle.GetCoordValue();
1.3323 + NS_ASSERTION(aResult >= 0, "negative widths not allowed");
1.3324 + return true;
1.3325 +}
1.3326 +
1.3327 +// Only call on style coords for which GetAbsoluteCoord returned false.
1.3328 +static bool
1.3329 +GetPercentHeight(const nsStyleCoord& aStyle,
1.3330 + nsIFrame* aFrame,
1.3331 + nscoord& aResult)
1.3332 +{
1.3333 + if (eStyleUnit_Percent != aStyle.GetUnit() &&
1.3334 + !aStyle.IsCalcUnit())
1.3335 + return false;
1.3336 +
1.3337 + MOZ_ASSERT(!aStyle.IsCalcUnit() || aStyle.CalcHasPercent(),
1.3338 + "GetAbsoluteCoord should have handled this");
1.3339 +
1.3340 + nsIFrame *f = aFrame->GetContainingBlock();
1.3341 + if (!f) {
1.3342 + NS_NOTREACHED("top of frame tree not a containing block");
1.3343 + return false;
1.3344 + }
1.3345 +
1.3346 + // During reflow, nsHTMLScrollFrame::ReflowScrolledFrame uses
1.3347 + // SetComputedHeight on the reflow state for its child to propagate its
1.3348 + // computed height to the scrolled content. So here we skip to the scroll
1.3349 + // frame that contains this scrolled content in order to get the same
1.3350 + // behavior as layout when computing percentage heights.
1.3351 + if (f->StyleContext()->GetPseudo() == nsCSSAnonBoxes::scrolledContent) {
1.3352 + f = f->GetParent();
1.3353 + }
1.3354 +
1.3355 + const nsStylePosition *pos = f->StylePosition();
1.3356 + nscoord h;
1.3357 + if (!GetAbsoluteCoord(pos->mHeight, h) &&
1.3358 + !GetPercentHeight(pos->mHeight, f, h)) {
1.3359 + NS_ASSERTION(pos->mHeight.GetUnit() == eStyleUnit_Auto ||
1.3360 + pos->mHeight.HasPercent(),
1.3361 + "unknown height unit");
1.3362 + nsIAtom* fType = f->GetType();
1.3363 + if (fType != nsGkAtoms::viewportFrame && fType != nsGkAtoms::canvasFrame &&
1.3364 + fType != nsGkAtoms::pageContentFrame) {
1.3365 + // There's no basis for the percentage height, so it acts like auto.
1.3366 + // Should we consider a max-height < min-height pair a basis for
1.3367 + // percentage heights? The spec is somewhat unclear, and not doing
1.3368 + // so is simpler and avoids troubling discontinuities in behavior,
1.3369 + // so I'll choose not to. -LDB
1.3370 + return false;
1.3371 + }
1.3372 +
1.3373 + NS_ASSERTION(pos->mHeight.GetUnit() == eStyleUnit_Auto,
1.3374 + "Unexpected height unit for viewport or canvas or page-content");
1.3375 + // For the viewport, canvas, and page-content kids, the percentage
1.3376 + // basis is just the parent height.
1.3377 + h = f->GetSize().height;
1.3378 + if (h == NS_UNCONSTRAINEDSIZE) {
1.3379 + // We don't have a percentage basis after all
1.3380 + return false;
1.3381 + }
1.3382 + }
1.3383 +
1.3384 + nscoord maxh;
1.3385 + if (GetAbsoluteCoord(pos->mMaxHeight, maxh) ||
1.3386 + GetPercentHeight(pos->mMaxHeight, f, maxh)) {
1.3387 + if (maxh < h)
1.3388 + h = maxh;
1.3389 + } else {
1.3390 + NS_ASSERTION(pos->mMaxHeight.GetUnit() == eStyleUnit_None ||
1.3391 + pos->mMaxHeight.HasPercent(),
1.3392 + "unknown max-height unit");
1.3393 + }
1.3394 +
1.3395 + nscoord minh;
1.3396 + if (GetAbsoluteCoord(pos->mMinHeight, minh) ||
1.3397 + GetPercentHeight(pos->mMinHeight, f, minh)) {
1.3398 + if (minh > h)
1.3399 + h = minh;
1.3400 + } else {
1.3401 + NS_ASSERTION(pos->mMinHeight.HasPercent(),
1.3402 + "unknown min-height unit");
1.3403 + }
1.3404 +
1.3405 + if (aStyle.IsCalcUnit()) {
1.3406 + aResult = std::max(nsRuleNode::ComputeComputedCalc(aStyle, h), 0);
1.3407 + return true;
1.3408 + }
1.3409 +
1.3410 + aResult = NSToCoordRound(aStyle.GetPercentValue() * h);
1.3411 + return true;
1.3412 +}
1.3413 +
1.3414 +// Handles only -moz-max-content and -moz-min-content, and
1.3415 +// -moz-fit-content for min-width and max-width, since the others
1.3416 +// (-moz-fit-content for width, and -moz-available) have no effect on
1.3417 +// intrinsic widths.
1.3418 +enum eWidthProperty { PROP_WIDTH, PROP_MAX_WIDTH, PROP_MIN_WIDTH };
1.3419 +static bool
1.3420 +GetIntrinsicCoord(const nsStyleCoord& aStyle,
1.3421 + nsRenderingContext* aRenderingContext,
1.3422 + nsIFrame* aFrame,
1.3423 + eWidthProperty aProperty,
1.3424 + nscoord& aResult)
1.3425 +{
1.3426 + NS_PRECONDITION(aProperty == PROP_WIDTH || aProperty == PROP_MAX_WIDTH ||
1.3427 + aProperty == PROP_MIN_WIDTH, "unexpected property");
1.3428 + if (aStyle.GetUnit() != eStyleUnit_Enumerated)
1.3429 + return false;
1.3430 + int32_t val = aStyle.GetIntValue();
1.3431 + NS_ASSERTION(val == NS_STYLE_WIDTH_MAX_CONTENT ||
1.3432 + val == NS_STYLE_WIDTH_MIN_CONTENT ||
1.3433 + val == NS_STYLE_WIDTH_FIT_CONTENT ||
1.3434 + val == NS_STYLE_WIDTH_AVAILABLE,
1.3435 + "unexpected enumerated value for width property");
1.3436 + if (val == NS_STYLE_WIDTH_AVAILABLE)
1.3437 + return false;
1.3438 + if (val == NS_STYLE_WIDTH_FIT_CONTENT) {
1.3439 + if (aProperty == PROP_WIDTH)
1.3440 + return false; // handle like 'width: auto'
1.3441 + if (aProperty == PROP_MAX_WIDTH)
1.3442 + // constrain large 'width' values down to -moz-max-content
1.3443 + val = NS_STYLE_WIDTH_MAX_CONTENT;
1.3444 + else
1.3445 + // constrain small 'width' or 'max-width' values up to -moz-min-content
1.3446 + val = NS_STYLE_WIDTH_MIN_CONTENT;
1.3447 + }
1.3448 +
1.3449 + NS_ASSERTION(val == NS_STYLE_WIDTH_MAX_CONTENT ||
1.3450 + val == NS_STYLE_WIDTH_MIN_CONTENT,
1.3451 + "should have reduced everything remaining to one of these");
1.3452 +
1.3453 + // If aFrame is a container for font size inflation, then shrink
1.3454 + // wrapping inside of it should not apply font size inflation.
1.3455 + AutoMaybeDisableFontInflation an(aFrame);
1.3456 +
1.3457 + if (val == NS_STYLE_WIDTH_MAX_CONTENT)
1.3458 + aResult = aFrame->GetPrefWidth(aRenderingContext);
1.3459 + else
1.3460 + aResult = aFrame->GetMinWidth(aRenderingContext);
1.3461 + return true;
1.3462 +}
1.3463 +
1.3464 +#undef DEBUG_INTRINSIC_WIDTH
1.3465 +
1.3466 +#ifdef DEBUG_INTRINSIC_WIDTH
1.3467 +static int32_t gNoiseIndent = 0;
1.3468 +#endif
1.3469 +
1.3470 +/* static */ nscoord
1.3471 +nsLayoutUtils::IntrinsicForContainer(nsRenderingContext *aRenderingContext,
1.3472 + nsIFrame *aFrame,
1.3473 + IntrinsicWidthType aType,
1.3474 + uint32_t aFlags)
1.3475 +{
1.3476 + NS_PRECONDITION(aFrame, "null frame");
1.3477 + NS_PRECONDITION(aType == MIN_WIDTH || aType == PREF_WIDTH, "bad type");
1.3478 +
1.3479 +#ifdef DEBUG_INTRINSIC_WIDTH
1.3480 + nsFrame::IndentBy(stderr, gNoiseIndent);
1.3481 + static_cast<nsFrame*>(aFrame)->ListTag(stderr);
1.3482 + printf_stderr(" %s intrinsic width for container:\n",
1.3483 + aType == MIN_WIDTH ? "min" : "pref");
1.3484 +#endif
1.3485 +
1.3486 + // If aFrame is a container for font size inflation, then shrink
1.3487 + // wrapping inside of it should not apply font size inflation.
1.3488 + AutoMaybeDisableFontInflation an(aFrame);
1.3489 +
1.3490 + nsIFrame::IntrinsicWidthOffsetData offsets =
1.3491 + aFrame->IntrinsicWidthOffsets(aRenderingContext);
1.3492 +
1.3493 + const nsStylePosition *stylePos = aFrame->StylePosition();
1.3494 + uint8_t boxSizing = stylePos->mBoxSizing;
1.3495 + const nsStyleCoord &styleWidth = stylePos->mWidth;
1.3496 + const nsStyleCoord &styleMinWidth = stylePos->mMinWidth;
1.3497 + const nsStyleCoord &styleMaxWidth = stylePos->mMaxWidth;
1.3498 +
1.3499 + // We build up two values starting with the content box, and then
1.3500 + // adding padding, border and margin. The result is normally
1.3501 + // |result|. Then, when we handle 'width', 'min-width', and
1.3502 + // 'max-width', we use the results we've been building in |min| as a
1.3503 + // minimum, overriding 'min-width'. This ensures two things:
1.3504 + // * that we don't let a value of 'box-sizing' specifying a width
1.3505 + // smaller than the padding/border inside the box-sizing box give
1.3506 + // a content width less than zero
1.3507 + // * that we prevent tables from becoming smaller than their
1.3508 + // intrinsic minimum width
1.3509 + nscoord result = 0, min = 0;
1.3510 +
1.3511 + nscoord maxw;
1.3512 + bool haveFixedMaxWidth = GetAbsoluteCoord(styleMaxWidth, maxw);
1.3513 + nscoord minw;
1.3514 + bool haveFixedMinWidth = GetAbsoluteCoord(styleMinWidth, minw);
1.3515 +
1.3516 + // If we have a specified width (or a specified 'min-width' greater
1.3517 + // than the specified 'max-width', which works out to the same thing),
1.3518 + // don't even bother getting the frame's intrinsic width, because in
1.3519 + // this case GetAbsoluteCoord(styleWidth, w) will always succeed, so
1.3520 + // we'll never need the intrinsic dimensions.
1.3521 + if (styleWidth.GetUnit() == eStyleUnit_Enumerated &&
1.3522 + (styleWidth.GetIntValue() == NS_STYLE_WIDTH_MAX_CONTENT ||
1.3523 + styleWidth.GetIntValue() == NS_STYLE_WIDTH_MIN_CONTENT)) {
1.3524 + // -moz-fit-content and -moz-available enumerated widths compute intrinsic
1.3525 + // widths just like auto.
1.3526 + // For -moz-max-content and -moz-min-content, we handle them like
1.3527 + // specified widths, but ignore box-sizing.
1.3528 + boxSizing = NS_STYLE_BOX_SIZING_CONTENT;
1.3529 + } else if (!styleWidth.ConvertsToLength() &&
1.3530 + !(haveFixedMinWidth && haveFixedMaxWidth && maxw <= minw)) {
1.3531 +#ifdef DEBUG_INTRINSIC_WIDTH
1.3532 + ++gNoiseIndent;
1.3533 +#endif
1.3534 + if (aType == MIN_WIDTH)
1.3535 + result = aFrame->GetMinWidth(aRenderingContext);
1.3536 + else
1.3537 + result = aFrame->GetPrefWidth(aRenderingContext);
1.3538 +#ifdef DEBUG_INTRINSIC_WIDTH
1.3539 + --gNoiseIndent;
1.3540 + nsFrame::IndentBy(stderr, gNoiseIndent);
1.3541 + static_cast<nsFrame*>(aFrame)->ListTag(stderr);
1.3542 + printf_stderr(" %s intrinsic width from frame is %d.\n",
1.3543 + aType == MIN_WIDTH ? "min" : "pref", result);
1.3544 +#endif
1.3545 +
1.3546 + // Handle elements with an intrinsic ratio (or size) and a specified
1.3547 + // height, min-height, or max-height.
1.3548 + const nsStyleCoord &styleHeight = stylePos->mHeight;
1.3549 + const nsStyleCoord &styleMinHeight = stylePos->mMinHeight;
1.3550 + const nsStyleCoord &styleMaxHeight = stylePos->mMaxHeight;
1.3551 + if (styleHeight.GetUnit() != eStyleUnit_Auto ||
1.3552 + !(styleMinHeight.GetUnit() == eStyleUnit_Coord &&
1.3553 + styleMinHeight.GetCoordValue() == 0) ||
1.3554 + styleMaxHeight.GetUnit() != eStyleUnit_None) {
1.3555 +
1.3556 + nsSize ratio = aFrame->GetIntrinsicRatio();
1.3557 +
1.3558 + if (ratio.height != 0) {
1.3559 + nscoord heightTakenByBoxSizing = 0;
1.3560 + switch (boxSizing) {
1.3561 + case NS_STYLE_BOX_SIZING_BORDER: {
1.3562 + const nsStyleBorder* styleBorder = aFrame->StyleBorder();
1.3563 + heightTakenByBoxSizing +=
1.3564 + styleBorder->GetComputedBorder().TopBottom();
1.3565 + // fall through
1.3566 + }
1.3567 + case NS_STYLE_BOX_SIZING_PADDING: {
1.3568 + if (!(aFlags & IGNORE_PADDING)) {
1.3569 + const nsStylePadding* stylePadding = aFrame->StylePadding();
1.3570 + nscoord pad;
1.3571 + if (GetAbsoluteCoord(stylePadding->mPadding.GetTop(), pad) ||
1.3572 + GetPercentHeight(stylePadding->mPadding.GetTop(), aFrame, pad)) {
1.3573 + heightTakenByBoxSizing += pad;
1.3574 + }
1.3575 + if (GetAbsoluteCoord(stylePadding->mPadding.GetBottom(), pad) ||
1.3576 + GetPercentHeight(stylePadding->mPadding.GetBottom(), aFrame, pad)) {
1.3577 + heightTakenByBoxSizing += pad;
1.3578 + }
1.3579 + }
1.3580 + // fall through
1.3581 + }
1.3582 + case NS_STYLE_BOX_SIZING_CONTENT:
1.3583 + default:
1.3584 + break;
1.3585 + }
1.3586 +
1.3587 + nscoord h;
1.3588 + if (GetAbsoluteCoord(styleHeight, h) ||
1.3589 + GetPercentHeight(styleHeight, aFrame, h)) {
1.3590 + h = std::max(0, h - heightTakenByBoxSizing);
1.3591 + result =
1.3592 + NSToCoordRound(h * (float(ratio.width) / float(ratio.height)));
1.3593 + }
1.3594 +
1.3595 + if (GetAbsoluteCoord(styleMaxHeight, h) ||
1.3596 + GetPercentHeight(styleMaxHeight, aFrame, h)) {
1.3597 + h = std::max(0, h - heightTakenByBoxSizing);
1.3598 + nscoord maxWidth =
1.3599 + NSToCoordRound(h * (float(ratio.width) / float(ratio.height)));
1.3600 + if (maxWidth < result)
1.3601 + result = maxWidth;
1.3602 + }
1.3603 +
1.3604 + if (GetAbsoluteCoord(styleMinHeight, h) ||
1.3605 + GetPercentHeight(styleMinHeight, aFrame, h)) {
1.3606 + h = std::max(0, h - heightTakenByBoxSizing);
1.3607 + nscoord minWidth =
1.3608 + NSToCoordRound(h * (float(ratio.width) / float(ratio.height)));
1.3609 + if (minWidth > result)
1.3610 + result = minWidth;
1.3611 + }
1.3612 + }
1.3613 + }
1.3614 + }
1.3615 +
1.3616 + if (aFrame->GetType() == nsGkAtoms::tableFrame) {
1.3617 + // Tables can't shrink smaller than their intrinsic minimum width,
1.3618 + // no matter what.
1.3619 + min = aFrame->GetMinWidth(aRenderingContext);
1.3620 + }
1.3621 +
1.3622 + // We also need to track what has been added on outside of the box
1.3623 + // (controlled by 'box-sizing') where 'width', 'min-width' and
1.3624 + // 'max-width' are applied. We have to account for these properties
1.3625 + // after getting all the offsets (margin, border, padding) because
1.3626 + // percentages do not operate linearly.
1.3627 + // Doing this is ok because although percentages aren't handled
1.3628 + // linearly, they are handled monotonically.
1.3629 + nscoord coordOutsideWidth = 0;
1.3630 + float pctOutsideWidth = 0;
1.3631 + float pctTotal = 0.0f;
1.3632 +
1.3633 + if (!(aFlags & IGNORE_PADDING)) {
1.3634 + coordOutsideWidth += offsets.hPadding;
1.3635 + pctOutsideWidth += offsets.hPctPadding;
1.3636 +
1.3637 + if (boxSizing == NS_STYLE_BOX_SIZING_PADDING) {
1.3638 + min += coordOutsideWidth;
1.3639 + result = NSCoordSaturatingAdd(result, coordOutsideWidth);
1.3640 + pctTotal += pctOutsideWidth;
1.3641 +
1.3642 + coordOutsideWidth = 0;
1.3643 + pctOutsideWidth = 0.0f;
1.3644 + }
1.3645 + }
1.3646 +
1.3647 + coordOutsideWidth += offsets.hBorder;
1.3648 +
1.3649 + if (boxSizing == NS_STYLE_BOX_SIZING_BORDER) {
1.3650 + min += coordOutsideWidth;
1.3651 + result = NSCoordSaturatingAdd(result, coordOutsideWidth);
1.3652 + pctTotal += pctOutsideWidth;
1.3653 +
1.3654 + coordOutsideWidth = 0;
1.3655 + pctOutsideWidth = 0.0f;
1.3656 + }
1.3657 +
1.3658 + coordOutsideWidth += offsets.hMargin;
1.3659 + pctOutsideWidth += offsets.hPctMargin;
1.3660 +
1.3661 + min += coordOutsideWidth;
1.3662 + result = NSCoordSaturatingAdd(result, coordOutsideWidth);
1.3663 + pctTotal += pctOutsideWidth;
1.3664 +
1.3665 + nscoord w;
1.3666 + if (GetAbsoluteCoord(styleWidth, w) ||
1.3667 + GetIntrinsicCoord(styleWidth, aRenderingContext, aFrame,
1.3668 + PROP_WIDTH, w)) {
1.3669 + result = AddPercents(aType, w + coordOutsideWidth, pctOutsideWidth);
1.3670 + }
1.3671 + else if (aType == MIN_WIDTH &&
1.3672 + // The only cases of coord-percent-calc() units that
1.3673 + // GetAbsoluteCoord didn't handle are percent and calc()s
1.3674 + // containing percent.
1.3675 + styleWidth.IsCoordPercentCalcUnit() &&
1.3676 + aFrame->IsFrameOfType(nsIFrame::eReplaced)) {
1.3677 + // A percentage width on replaced elements means they can shrink to 0.
1.3678 + result = 0; // let |min| handle padding/border/margin
1.3679 + }
1.3680 + else {
1.3681 + // NOTE: We could really do a lot better for percents and for some
1.3682 + // cases of calc() containing percent (certainly including any where
1.3683 + // the coefficient on the percent is positive and there are no max()
1.3684 + // expressions). However, doing better for percents wouldn't be
1.3685 + // backwards compatible.
1.3686 + result = AddPercents(aType, result, pctTotal);
1.3687 + }
1.3688 +
1.3689 + if (haveFixedMaxWidth ||
1.3690 + GetIntrinsicCoord(styleMaxWidth, aRenderingContext, aFrame,
1.3691 + PROP_MAX_WIDTH, maxw)) {
1.3692 + maxw = AddPercents(aType, maxw + coordOutsideWidth, pctOutsideWidth);
1.3693 + if (result > maxw)
1.3694 + result = maxw;
1.3695 + }
1.3696 +
1.3697 + if (haveFixedMinWidth ||
1.3698 + GetIntrinsicCoord(styleMinWidth, aRenderingContext, aFrame,
1.3699 + PROP_MIN_WIDTH, minw)) {
1.3700 + minw = AddPercents(aType, minw + coordOutsideWidth, pctOutsideWidth);
1.3701 + if (result < minw)
1.3702 + result = minw;
1.3703 + }
1.3704 +
1.3705 + min = AddPercents(aType, min, pctTotal);
1.3706 + if (result < min)
1.3707 + result = min;
1.3708 +
1.3709 + const nsStyleDisplay *disp = aFrame->StyleDisplay();
1.3710 + if (aFrame->IsThemed(disp)) {
1.3711 + nsIntSize size(0, 0);
1.3712 + bool canOverride = true;
1.3713 + nsPresContext *presContext = aFrame->PresContext();
1.3714 + presContext->GetTheme()->
1.3715 + GetMinimumWidgetSize(aRenderingContext, aFrame, disp->mAppearance,
1.3716 + &size, &canOverride);
1.3717 +
1.3718 + nscoord themeWidth = presContext->DevPixelsToAppUnits(size.width);
1.3719 +
1.3720 + // GMWS() returns a border-box width
1.3721 + themeWidth += offsets.hMargin;
1.3722 + themeWidth = AddPercents(aType, themeWidth, offsets.hPctMargin);
1.3723 +
1.3724 + if (themeWidth > result || !canOverride)
1.3725 + result = themeWidth;
1.3726 + }
1.3727 +
1.3728 +#ifdef DEBUG_INTRINSIC_WIDTH
1.3729 + nsFrame::IndentBy(stderr, gNoiseIndent);
1.3730 + static_cast<nsFrame*>(aFrame)->ListTag(stderr);
1.3731 + printf_stderr(" %s intrinsic width for container is %d twips.\n",
1.3732 + aType == MIN_WIDTH ? "min" : "pref", result);
1.3733 +#endif
1.3734 +
1.3735 + return result;
1.3736 +}
1.3737 +
1.3738 +/* static */ nscoord
1.3739 +nsLayoutUtils::ComputeCBDependentValue(nscoord aPercentBasis,
1.3740 + const nsStyleCoord& aCoord)
1.3741 +{
1.3742 + NS_WARN_IF_FALSE(aPercentBasis != NS_UNCONSTRAINEDSIZE,
1.3743 + "have unconstrained width or height; this should only "
1.3744 + "result from very large sizes, not attempts at intrinsic "
1.3745 + "size calculation");
1.3746 +
1.3747 + if (aCoord.IsCoordPercentCalcUnit()) {
1.3748 + return nsRuleNode::ComputeCoordPercentCalc(aCoord, aPercentBasis);
1.3749 + }
1.3750 + NS_ASSERTION(aCoord.GetUnit() == eStyleUnit_None ||
1.3751 + aCoord.GetUnit() == eStyleUnit_Auto,
1.3752 + "unexpected width value");
1.3753 + return 0;
1.3754 +}
1.3755 +
1.3756 +/* static */ nscoord
1.3757 +nsLayoutUtils::ComputeWidthValue(
1.3758 + nsRenderingContext* aRenderingContext,
1.3759 + nsIFrame* aFrame,
1.3760 + nscoord aContainingBlockWidth,
1.3761 + nscoord aContentEdgeToBoxSizing,
1.3762 + nscoord aBoxSizingToMarginEdge,
1.3763 + const nsStyleCoord& aCoord)
1.3764 +{
1.3765 + NS_PRECONDITION(aFrame, "non-null frame expected");
1.3766 + NS_PRECONDITION(aRenderingContext, "non-null rendering context expected");
1.3767 + NS_WARN_IF_FALSE(aContainingBlockWidth != NS_UNCONSTRAINEDSIZE,
1.3768 + "have unconstrained width; this should only result from "
1.3769 + "very large sizes, not attempts at intrinsic width "
1.3770 + "calculation");
1.3771 + NS_PRECONDITION(aContainingBlockWidth >= 0,
1.3772 + "width less than zero");
1.3773 +
1.3774 + nscoord result;
1.3775 + if (aCoord.IsCoordPercentCalcUnit()) {
1.3776 + result = nsRuleNode::ComputeCoordPercentCalc(aCoord,
1.3777 + aContainingBlockWidth);
1.3778 + // The result of a calc() expression might be less than 0; we
1.3779 + // should clamp at runtime (below). (Percentages and coords that
1.3780 + // are less than 0 have already been dropped by the parser.)
1.3781 + result -= aContentEdgeToBoxSizing;
1.3782 + } else {
1.3783 + MOZ_ASSERT(eStyleUnit_Enumerated == aCoord.GetUnit());
1.3784 + // If aFrame is a container for font size inflation, then shrink
1.3785 + // wrapping inside of it should not apply font size inflation.
1.3786 + AutoMaybeDisableFontInflation an(aFrame);
1.3787 +
1.3788 + int32_t val = aCoord.GetIntValue();
1.3789 + switch (val) {
1.3790 + case NS_STYLE_WIDTH_MAX_CONTENT:
1.3791 + result = aFrame->GetPrefWidth(aRenderingContext);
1.3792 + NS_ASSERTION(result >= 0, "width less than zero");
1.3793 + break;
1.3794 + case NS_STYLE_WIDTH_MIN_CONTENT:
1.3795 + result = aFrame->GetMinWidth(aRenderingContext);
1.3796 + NS_ASSERTION(result >= 0, "width less than zero");
1.3797 + break;
1.3798 + case NS_STYLE_WIDTH_FIT_CONTENT:
1.3799 + {
1.3800 + nscoord pref = aFrame->GetPrefWidth(aRenderingContext),
1.3801 + min = aFrame->GetMinWidth(aRenderingContext),
1.3802 + fill = aContainingBlockWidth -
1.3803 + (aBoxSizingToMarginEdge + aContentEdgeToBoxSizing);
1.3804 + result = std::max(min, std::min(pref, fill));
1.3805 + NS_ASSERTION(result >= 0, "width less than zero");
1.3806 + }
1.3807 + break;
1.3808 + case NS_STYLE_WIDTH_AVAILABLE:
1.3809 + result = aContainingBlockWidth -
1.3810 + (aBoxSizingToMarginEdge + aContentEdgeToBoxSizing);
1.3811 + }
1.3812 + }
1.3813 +
1.3814 + return std::max(0, result);
1.3815 +}
1.3816 +
1.3817 +/* static */ nscoord
1.3818 +nsLayoutUtils::ComputeHeightDependentValue(
1.3819 + nscoord aContainingBlockHeight,
1.3820 + const nsStyleCoord& aCoord)
1.3821 +{
1.3822 + // XXXldb Some callers explicitly check aContainingBlockHeight
1.3823 + // against NS_AUTOHEIGHT *and* unit against eStyleUnit_Percent or
1.3824 + // calc()s containing percents before calling this function.
1.3825 + // However, it would be much more likely to catch problems without
1.3826 + // the unit conditions.
1.3827 + // XXXldb Many callers pass a non-'auto' containing block height when
1.3828 + // according to CSS2.1 they should be passing 'auto'.
1.3829 + NS_PRECONDITION(NS_AUTOHEIGHT != aContainingBlockHeight ||
1.3830 + !aCoord.HasPercent(),
1.3831 + "unexpected containing block height");
1.3832 +
1.3833 + if (aCoord.IsCoordPercentCalcUnit()) {
1.3834 + return nsRuleNode::ComputeCoordPercentCalc(aCoord, aContainingBlockHeight);
1.3835 + }
1.3836 +
1.3837 + NS_ASSERTION(aCoord.GetUnit() == eStyleUnit_None ||
1.3838 + aCoord.GetUnit() == eStyleUnit_Auto,
1.3839 + "unexpected height value");
1.3840 + return 0;
1.3841 +}
1.3842 +
1.3843 +/* static */ void
1.3844 +nsLayoutUtils::MarkDescendantsDirty(nsIFrame *aSubtreeRoot)
1.3845 +{
1.3846 + nsAutoTArray<nsIFrame*, 4> subtrees;
1.3847 + subtrees.AppendElement(aSubtreeRoot);
1.3848 +
1.3849 + // dirty descendants, iterating over subtrees that may include
1.3850 + // additional subtrees associated with placeholders
1.3851 + do {
1.3852 + nsIFrame *subtreeRoot = subtrees.ElementAt(subtrees.Length() - 1);
1.3853 + subtrees.RemoveElementAt(subtrees.Length() - 1);
1.3854 +
1.3855 + // Mark all descendants dirty (using an nsTArray stack rather than
1.3856 + // recursion).
1.3857 + // Note that nsHTMLReflowState::InitResizeFlags has some similar
1.3858 + // code; see comments there for how and why it differs.
1.3859 + nsAutoTArray<nsIFrame*, 32> stack;
1.3860 + stack.AppendElement(subtreeRoot);
1.3861 +
1.3862 + do {
1.3863 + nsIFrame *f = stack.ElementAt(stack.Length() - 1);
1.3864 + stack.RemoveElementAt(stack.Length() - 1);
1.3865 +
1.3866 + f->MarkIntrinsicWidthsDirty();
1.3867 +
1.3868 + if (f->GetType() == nsGkAtoms::placeholderFrame) {
1.3869 + nsIFrame *oof = nsPlaceholderFrame::GetRealFrameForPlaceholder(f);
1.3870 + if (!nsLayoutUtils::IsProperAncestorFrame(subtreeRoot, oof)) {
1.3871 + // We have another distinct subtree we need to mark.
1.3872 + subtrees.AppendElement(oof);
1.3873 + }
1.3874 + }
1.3875 +
1.3876 + nsIFrame::ChildListIterator lists(f);
1.3877 + for (; !lists.IsDone(); lists.Next()) {
1.3878 + nsFrameList::Enumerator childFrames(lists.CurrentList());
1.3879 + for (; !childFrames.AtEnd(); childFrames.Next()) {
1.3880 + nsIFrame* kid = childFrames.get();
1.3881 + stack.AppendElement(kid);
1.3882 + }
1.3883 + }
1.3884 + } while (stack.Length() != 0);
1.3885 + } while (subtrees.Length() != 0);
1.3886 +}
1.3887 +
1.3888 +#define MULDIV(a,b,c) (nscoord(int64_t(a) * int64_t(b) / int64_t(c)))
1.3889 +
1.3890 +/* static */ nsSize
1.3891 +nsLayoutUtils::ComputeSizeWithIntrinsicDimensions(
1.3892 + nsRenderingContext* aRenderingContext, nsIFrame* aFrame,
1.3893 + const IntrinsicSize& aIntrinsicSize,
1.3894 + nsSize aIntrinsicRatio, nsSize aCBSize,
1.3895 + nsSize aMargin, nsSize aBorder, nsSize aPadding)
1.3896 +{
1.3897 + const nsStylePosition* stylePos = aFrame->StylePosition();
1.3898 +
1.3899 + // If we're a flex item, we'll compute our size a bit differently.
1.3900 + const nsStyleCoord* widthStyleCoord = &(stylePos->mWidth);
1.3901 + const nsStyleCoord* heightStyleCoord = &(stylePos->mHeight);
1.3902 +
1.3903 + bool isFlexItem = aFrame->IsFlexItem();
1.3904 + bool isHorizontalFlexItem = false;
1.3905 +
1.3906 + if (isFlexItem) {
1.3907 + // Flex items use their "flex-basis" property in place of their main-size
1.3908 + // property (e.g. "width") for sizing purposes, *unless* they have
1.3909 + // "flex-basis:auto", in which case they use their main-size property after
1.3910 + // all.
1.3911 + uint32_t flexDirection =
1.3912 + aFrame->GetParent()->StylePosition()->mFlexDirection;
1.3913 + isHorizontalFlexItem =
1.3914 + flexDirection == NS_STYLE_FLEX_DIRECTION_ROW ||
1.3915 + flexDirection == NS_STYLE_FLEX_DIRECTION_ROW_REVERSE;
1.3916 +
1.3917 + // NOTE: The logic here should match the similar chunk for determining
1.3918 + // widthStyleCoord and heightStyleCoord in nsFrame::ComputeSize().
1.3919 + const nsStyleCoord* flexBasis = &(stylePos->mFlexBasis);
1.3920 + if (flexBasis->GetUnit() != eStyleUnit_Auto) {
1.3921 + if (isHorizontalFlexItem) {
1.3922 + widthStyleCoord = flexBasis;
1.3923 + } else {
1.3924 + // One caveat for vertical flex items: We don't support enumerated
1.3925 + // values (e.g. "max-content") for height properties yet. So, if our
1.3926 + // computed flex-basis is an enumerated value, we'll just behave as if
1.3927 + // it were "auto", which means "use the main-size property after all"
1.3928 + // (which is "height", in this case).
1.3929 + // NOTE: Once we support intrinsic sizing keywords for "height",
1.3930 + // we should remove this check.
1.3931 + if (flexBasis->GetUnit() != eStyleUnit_Enumerated) {
1.3932 + heightStyleCoord = flexBasis;
1.3933 + }
1.3934 + }
1.3935 + }
1.3936 + }
1.3937 +
1.3938 + // Handle intrinsic sizes and their interaction with
1.3939 + // {min-,max-,}{width,height} according to the rules in
1.3940 + // http://www.w3.org/TR/CSS21/visudet.html#min-max-widths
1.3941 +
1.3942 + // Note: throughout the following section of the function, I avoid
1.3943 + // a * (b / c) because of its reduced accuracy relative to a * b / c
1.3944 + // or (a * b) / c (which are equivalent).
1.3945 +
1.3946 + const bool isAutoWidth = widthStyleCoord->GetUnit() == eStyleUnit_Auto;
1.3947 + const bool isAutoHeight = IsAutoHeight(*heightStyleCoord, aCBSize.height);
1.3948 +
1.3949 + nsSize boxSizingAdjust(0,0);
1.3950 + switch (stylePos->mBoxSizing) {
1.3951 + case NS_STYLE_BOX_SIZING_BORDER:
1.3952 + boxSizingAdjust += aBorder;
1.3953 + // fall through
1.3954 + case NS_STYLE_BOX_SIZING_PADDING:
1.3955 + boxSizingAdjust += aPadding;
1.3956 + }
1.3957 + nscoord boxSizingToMarginEdgeWidth =
1.3958 + aMargin.width + aBorder.width + aPadding.width - boxSizingAdjust.width;
1.3959 +
1.3960 + nscoord width, minWidth, maxWidth, height, minHeight, maxHeight;
1.3961 +
1.3962 + if (!isAutoWidth) {
1.3963 + width = nsLayoutUtils::ComputeWidthValue(aRenderingContext,
1.3964 + aFrame, aCBSize.width, boxSizingAdjust.width,
1.3965 + boxSizingToMarginEdgeWidth, *widthStyleCoord);
1.3966 + }
1.3967 +
1.3968 + if (stylePos->mMaxWidth.GetUnit() != eStyleUnit_None &&
1.3969 + !(isFlexItem && isHorizontalFlexItem)) {
1.3970 + maxWidth = nsLayoutUtils::ComputeWidthValue(aRenderingContext,
1.3971 + aFrame, aCBSize.width, boxSizingAdjust.width,
1.3972 + boxSizingToMarginEdgeWidth, stylePos->mMaxWidth);
1.3973 + } else {
1.3974 + // NOTE: Flex items ignore their min & max sizing properties in their
1.3975 + // flex container's main-axis. (Those properties get applied later in
1.3976 + // the flexbox algorithm.)
1.3977 + maxWidth = nscoord_MAX;
1.3978 + }
1.3979 +
1.3980 + if (!(isFlexItem && isHorizontalFlexItem)) {
1.3981 + minWidth = nsLayoutUtils::ComputeWidthValue(aRenderingContext,
1.3982 + aFrame, aCBSize.width, boxSizingAdjust.width,
1.3983 + boxSizingToMarginEdgeWidth, stylePos->mMinWidth);
1.3984 + } else {
1.3985 + // NOTE: Flex items ignore their min & max sizing properties in their
1.3986 + // flex container's main-axis. (Those properties get applied later in
1.3987 + // the flexbox algorithm.)
1.3988 + minWidth = 0;
1.3989 + }
1.3990 +
1.3991 + if (!isAutoHeight) {
1.3992 + height = nsLayoutUtils::ComputeHeightValue(aCBSize.height,
1.3993 + boxSizingAdjust.height,
1.3994 + *heightStyleCoord);
1.3995 + }
1.3996 +
1.3997 + if (!IsAutoHeight(stylePos->mMaxHeight, aCBSize.height) &&
1.3998 + !(isFlexItem && !isHorizontalFlexItem)) {
1.3999 + maxHeight = nsLayoutUtils::ComputeHeightValue(aCBSize.height,
1.4000 + boxSizingAdjust.height,
1.4001 + stylePos->mMaxHeight);
1.4002 + } else {
1.4003 + maxHeight = nscoord_MAX;
1.4004 + }
1.4005 +
1.4006 + if (!IsAutoHeight(stylePos->mMinHeight, aCBSize.height) &&
1.4007 + !(isFlexItem && !isHorizontalFlexItem)) {
1.4008 + minHeight = nsLayoutUtils::ComputeHeightValue(aCBSize.height,
1.4009 + boxSizingAdjust.height,
1.4010 + stylePos->mMinHeight);
1.4011 + } else {
1.4012 + minHeight = 0;
1.4013 + }
1.4014 +
1.4015 + // Resolve percentage intrinsic width/height as necessary:
1.4016 +
1.4017 + NS_ASSERTION(aCBSize.width != NS_UNCONSTRAINEDSIZE,
1.4018 + "Our containing block must not have unconstrained width!");
1.4019 +
1.4020 + bool hasIntrinsicWidth, hasIntrinsicHeight;
1.4021 + nscoord intrinsicWidth, intrinsicHeight;
1.4022 +
1.4023 + if (aIntrinsicSize.width.GetUnit() == eStyleUnit_Coord) {
1.4024 + hasIntrinsicWidth = true;
1.4025 + intrinsicWidth = aIntrinsicSize.width.GetCoordValue();
1.4026 + if (intrinsicWidth < 0)
1.4027 + intrinsicWidth = 0;
1.4028 + } else {
1.4029 + NS_ASSERTION(aIntrinsicSize.width.GetUnit() == eStyleUnit_None,
1.4030 + "unexpected unit");
1.4031 + hasIntrinsicWidth = false;
1.4032 + intrinsicWidth = 0;
1.4033 + }
1.4034 +
1.4035 + if (aIntrinsicSize.height.GetUnit() == eStyleUnit_Coord) {
1.4036 + hasIntrinsicHeight = true;
1.4037 + intrinsicHeight = aIntrinsicSize.height.GetCoordValue();
1.4038 + if (intrinsicHeight < 0)
1.4039 + intrinsicHeight = 0;
1.4040 + } else {
1.4041 + NS_ASSERTION(aIntrinsicSize.height.GetUnit() == eStyleUnit_None,
1.4042 + "unexpected unit");
1.4043 + hasIntrinsicHeight = false;
1.4044 + intrinsicHeight = 0;
1.4045 + }
1.4046 +
1.4047 + NS_ASSERTION(aIntrinsicRatio.width >= 0 && aIntrinsicRatio.height >= 0,
1.4048 + "Intrinsic ratio has a negative component!");
1.4049 +
1.4050 + // Now calculate the used values for width and height:
1.4051 +
1.4052 + if (isAutoWidth) {
1.4053 + if (isAutoHeight) {
1.4054 +
1.4055 + // 'auto' width, 'auto' height
1.4056 +
1.4057 + // Get tentative values - CSS 2.1 sections 10.3.2 and 10.6.2:
1.4058 +
1.4059 + nscoord tentWidth, tentHeight;
1.4060 +
1.4061 + if (hasIntrinsicWidth) {
1.4062 + tentWidth = intrinsicWidth;
1.4063 + } else if (hasIntrinsicHeight && aIntrinsicRatio.height > 0) {
1.4064 + tentWidth = MULDIV(intrinsicHeight, aIntrinsicRatio.width, aIntrinsicRatio.height);
1.4065 + } else if (aIntrinsicRatio.width > 0) {
1.4066 + tentWidth = aCBSize.width - boxSizingToMarginEdgeWidth; // XXX scrollbar?
1.4067 + if (tentWidth < 0) tentWidth = 0;
1.4068 + } else {
1.4069 + tentWidth = nsPresContext::CSSPixelsToAppUnits(300);
1.4070 + }
1.4071 +
1.4072 + if (hasIntrinsicHeight) {
1.4073 + tentHeight = intrinsicHeight;
1.4074 + } else if (aIntrinsicRatio.width > 0) {
1.4075 + tentHeight = MULDIV(tentWidth, aIntrinsicRatio.height, aIntrinsicRatio.width);
1.4076 + } else {
1.4077 + tentHeight = nsPresContext::CSSPixelsToAppUnits(150);
1.4078 + }
1.4079 +
1.4080 + return ComputeAutoSizeWithIntrinsicDimensions(minWidth, minHeight,
1.4081 + maxWidth, maxHeight,
1.4082 + tentWidth, tentHeight);
1.4083 + } else {
1.4084 +
1.4085 + // 'auto' width, non-'auto' height
1.4086 + height = NS_CSS_MINMAX(height, minHeight, maxHeight);
1.4087 + if (aIntrinsicRatio.height > 0) {
1.4088 + width = MULDIV(height, aIntrinsicRatio.width, aIntrinsicRatio.height);
1.4089 + } else if (hasIntrinsicWidth) {
1.4090 + width = intrinsicWidth;
1.4091 + } else {
1.4092 + width = nsPresContext::CSSPixelsToAppUnits(300);
1.4093 + }
1.4094 + width = NS_CSS_MINMAX(width, minWidth, maxWidth);
1.4095 +
1.4096 + }
1.4097 + } else {
1.4098 + if (isAutoHeight) {
1.4099 +
1.4100 + // non-'auto' width, 'auto' height
1.4101 + width = NS_CSS_MINMAX(width, minWidth, maxWidth);
1.4102 + if (aIntrinsicRatio.width > 0) {
1.4103 + height = MULDIV(width, aIntrinsicRatio.height, aIntrinsicRatio.width);
1.4104 + } else if (hasIntrinsicHeight) {
1.4105 + height = intrinsicHeight;
1.4106 + } else {
1.4107 + height = nsPresContext::CSSPixelsToAppUnits(150);
1.4108 + }
1.4109 + height = NS_CSS_MINMAX(height, minHeight, maxHeight);
1.4110 +
1.4111 + } else {
1.4112 +
1.4113 + // non-'auto' width, non-'auto' height
1.4114 + width = NS_CSS_MINMAX(width, minWidth, maxWidth);
1.4115 + height = NS_CSS_MINMAX(height, minHeight, maxHeight);
1.4116 +
1.4117 + }
1.4118 + }
1.4119 +
1.4120 + return nsSize(width, height);
1.4121 +}
1.4122 +
1.4123 +nsSize
1.4124 +nsLayoutUtils::ComputeAutoSizeWithIntrinsicDimensions(nscoord minWidth, nscoord minHeight,
1.4125 + nscoord maxWidth, nscoord maxHeight,
1.4126 + nscoord tentWidth, nscoord tentHeight)
1.4127 +{
1.4128 + // Now apply min/max-width/height - CSS 2.1 sections 10.4 and 10.7:
1.4129 +
1.4130 + if (minWidth > maxWidth)
1.4131 + maxWidth = minWidth;
1.4132 + if (minHeight > maxHeight)
1.4133 + maxHeight = minHeight;
1.4134 +
1.4135 + nscoord heightAtMaxWidth, heightAtMinWidth,
1.4136 + widthAtMaxHeight, widthAtMinHeight;
1.4137 +
1.4138 + if (tentWidth > 0) {
1.4139 + heightAtMaxWidth = MULDIV(maxWidth, tentHeight, tentWidth);
1.4140 + if (heightAtMaxWidth < minHeight)
1.4141 + heightAtMaxWidth = minHeight;
1.4142 + heightAtMinWidth = MULDIV(minWidth, tentHeight, tentWidth);
1.4143 + if (heightAtMinWidth > maxHeight)
1.4144 + heightAtMinWidth = maxHeight;
1.4145 + } else {
1.4146 + heightAtMaxWidth = heightAtMinWidth = NS_CSS_MINMAX(tentHeight, minHeight, maxHeight);
1.4147 + }
1.4148 +
1.4149 + if (tentHeight > 0) {
1.4150 + widthAtMaxHeight = MULDIV(maxHeight, tentWidth, tentHeight);
1.4151 + if (widthAtMaxHeight < minWidth)
1.4152 + widthAtMaxHeight = minWidth;
1.4153 + widthAtMinHeight = MULDIV(minHeight, tentWidth, tentHeight);
1.4154 + if (widthAtMinHeight > maxWidth)
1.4155 + widthAtMinHeight = maxWidth;
1.4156 + } else {
1.4157 + widthAtMaxHeight = widthAtMinHeight = NS_CSS_MINMAX(tentWidth, minWidth, maxWidth);
1.4158 + }
1.4159 +
1.4160 + // The table at http://www.w3.org/TR/CSS21/visudet.html#min-max-widths :
1.4161 +
1.4162 + nscoord width, height;
1.4163 +
1.4164 + if (tentWidth > maxWidth) {
1.4165 + if (tentHeight > maxHeight) {
1.4166 + if (int64_t(maxWidth) * int64_t(tentHeight) <=
1.4167 + int64_t(maxHeight) * int64_t(tentWidth)) {
1.4168 + width = maxWidth;
1.4169 + height = heightAtMaxWidth;
1.4170 + } else {
1.4171 + width = widthAtMaxHeight;
1.4172 + height = maxHeight;
1.4173 + }
1.4174 + } else {
1.4175 + // This also covers "(w > max-width) and (h < min-height)" since in
1.4176 + // that case (max-width/w < 1), and with (h < min-height):
1.4177 + // max(max-width * h/w, min-height) == min-height
1.4178 + width = maxWidth;
1.4179 + height = heightAtMaxWidth;
1.4180 + }
1.4181 + } else if (tentWidth < minWidth) {
1.4182 + if (tentHeight < minHeight) {
1.4183 + if (int64_t(minWidth) * int64_t(tentHeight) <=
1.4184 + int64_t(minHeight) * int64_t(tentWidth)) {
1.4185 + width = widthAtMinHeight;
1.4186 + height = minHeight;
1.4187 + } else {
1.4188 + width = minWidth;
1.4189 + height = heightAtMinWidth;
1.4190 + }
1.4191 + } else {
1.4192 + // This also covers "(w < min-width) and (h > max-height)" since in
1.4193 + // that case (min-width/w > 1), and with (h > max-height):
1.4194 + // min(min-width * h/w, max-height) == max-height
1.4195 + width = minWidth;
1.4196 + height = heightAtMinWidth;
1.4197 + }
1.4198 + } else {
1.4199 + if (tentHeight > maxHeight) {
1.4200 + width = widthAtMaxHeight;
1.4201 + height = maxHeight;
1.4202 + } else if (tentHeight < minHeight) {
1.4203 + width = widthAtMinHeight;
1.4204 + height = minHeight;
1.4205 + } else {
1.4206 + width = tentWidth;
1.4207 + height = tentHeight;
1.4208 + }
1.4209 + }
1.4210 +
1.4211 + return nsSize(width, height);
1.4212 +}
1.4213 +
1.4214 +/* static */ nscoord
1.4215 +nsLayoutUtils::MinWidthFromInline(nsIFrame* aFrame,
1.4216 + nsRenderingContext* aRenderingContext)
1.4217 +{
1.4218 + NS_ASSERTION(!aFrame->IsContainerForFontSizeInflation(),
1.4219 + "should not be container for font size inflation");
1.4220 +
1.4221 + nsIFrame::InlineMinWidthData data;
1.4222 + DISPLAY_MIN_WIDTH(aFrame, data.prevLines);
1.4223 + aFrame->AddInlineMinWidth(aRenderingContext, &data);
1.4224 + data.ForceBreak(aRenderingContext);
1.4225 + return data.prevLines;
1.4226 +}
1.4227 +
1.4228 +/* static */ nscoord
1.4229 +nsLayoutUtils::PrefWidthFromInline(nsIFrame* aFrame,
1.4230 + nsRenderingContext* aRenderingContext)
1.4231 +{
1.4232 + NS_ASSERTION(!aFrame->IsContainerForFontSizeInflation(),
1.4233 + "should not be container for font size inflation");
1.4234 +
1.4235 + nsIFrame::InlinePrefWidthData data;
1.4236 + DISPLAY_PREF_WIDTH(aFrame, data.prevLines);
1.4237 + aFrame->AddInlinePrefWidth(aRenderingContext, &data);
1.4238 + data.ForceBreak(aRenderingContext);
1.4239 + return data.prevLines;
1.4240 +}
1.4241 +
1.4242 +static nscolor
1.4243 +DarkenColor(nscolor aColor)
1.4244 +{
1.4245 + uint16_t hue, sat, value;
1.4246 + uint8_t alpha;
1.4247 +
1.4248 + // convert the RBG to HSV so we can get the lightness (which is the v)
1.4249 + NS_RGB2HSV(aColor, hue, sat, value, alpha);
1.4250 +
1.4251 + // The goal here is to send white to black while letting colored
1.4252 + // stuff stay colored... So we adopt the following approach.
1.4253 + // Something with sat = 0 should end up with value = 0. Something
1.4254 + // with a high sat can end up with a high value and it's ok.... At
1.4255 + // the same time, we don't want to make things lighter. Do
1.4256 + // something simple, since it seems to work.
1.4257 + if (value > sat) {
1.4258 + value = sat;
1.4259 + // convert this color back into the RGB color space.
1.4260 + NS_HSV2RGB(aColor, hue, sat, value, alpha);
1.4261 + }
1.4262 + return aColor;
1.4263 +}
1.4264 +
1.4265 +// Check whether we should darken text/decoration colors. We need to do this if
1.4266 +// background images and colors are being suppressed, because that means
1.4267 +// light text will not be visible against the (presumed light-colored) background.
1.4268 +static bool
1.4269 +ShouldDarkenColors(nsPresContext* aPresContext)
1.4270 +{
1.4271 + return !aPresContext->GetBackgroundColorDraw() &&
1.4272 + !aPresContext->GetBackgroundImageDraw();
1.4273 +}
1.4274 +
1.4275 +nscolor
1.4276 +nsLayoutUtils::GetColor(nsIFrame* aFrame, nsCSSProperty aProperty)
1.4277 +{
1.4278 + if (aProperty == eCSSProperty_color)
1.4279 + {
1.4280 + nscolor nativeColor = NS_RGB(0, 0, 0);
1.4281 + if (GetNativeTextColor(aFrame, nativeColor))
1.4282 + return nativeColor;
1.4283 + }
1.4284 +
1.4285 + nscolor color = aFrame->GetVisitedDependentColor(aProperty);
1.4286 + if (ShouldDarkenColors(aFrame->PresContext())) {
1.4287 + color = DarkenColor(color);
1.4288 + }
1.4289 +
1.4290 + return color;
1.4291 +}
1.4292 +
1.4293 +bool
1.4294 +nsLayoutUtils::GetNativeTextColor(nsIFrame* aFrame, nscolor& aColor)
1.4295 +{
1.4296 + nsPresContext *presContext = aFrame->PresContext();
1.4297 + if (!presContext->IsChrome()) {
1.4298 + // If native appearance was used to draw the background of the containing
1.4299 + // frame, return a contrasting native foreground color instead of the
1.4300 + // color from the element's style. This avoids a problem where black
1.4301 + // text was displayed on a black background when a Windows theme such as
1.4302 + // "High Contrast Black" was used. The background is drawn inside
1.4303 + // nsNativeThemeWin::ClassicDrawWidgetBackground().
1.4304 + //
1.4305 + // Because both the background color and this foreground color are used
1.4306 + // directly without exposing the colors via CSS computed styles, the
1.4307 + // native colors are not leaked to content.
1.4308 + nsIFrame* bgFrame =
1.4309 + nsCSSRendering::FindNonTransparentBackgroundFrame(aFrame);
1.4310 + if (bgFrame) {
1.4311 + const nsStyleDisplay* displayData = bgFrame->StyleDisplay();
1.4312 + uint8_t widgetType = displayData->mAppearance;
1.4313 + nsITheme *theme = presContext->GetTheme();
1.4314 + if (theme && widgetType && theme->ThemeSupportsWidget(presContext,
1.4315 + bgFrame,
1.4316 + widgetType)) {
1.4317 + bool isDisabled = false;
1.4318 + nsIContent* frameContent = bgFrame->GetContent();
1.4319 + if (frameContent && frameContent->IsElement()) {
1.4320 + EventStates es = frameContent->AsElement()->State();
1.4321 + isDisabled = es.HasState(NS_EVENT_STATE_DISABLED);
1.4322 + }
1.4323 +
1.4324 + if (NS_SUCCEEDED(LookAndFeel::GetColorForNativeAppearance(widgetType,
1.4325 + isDisabled, &aColor))) {
1.4326 + return true;
1.4327 + }
1.4328 + }
1.4329 + }
1.4330 + }
1.4331 +
1.4332 + return false;
1.4333 +}
1.4334 +
1.4335 +gfxFloat
1.4336 +nsLayoutUtils::GetSnappedBaselineY(nsIFrame* aFrame, gfxContext* aContext,
1.4337 + nscoord aY, nscoord aAscent)
1.4338 +{
1.4339 + gfxFloat appUnitsPerDevUnit = aFrame->PresContext()->AppUnitsPerDevPixel();
1.4340 + gfxFloat baseline = gfxFloat(aY) + aAscent;
1.4341 + gfxRect putativeRect(0, baseline/appUnitsPerDevUnit, 1, 1);
1.4342 + if (!aContext->UserToDevicePixelSnapped(putativeRect, true))
1.4343 + return baseline;
1.4344 + return aContext->DeviceToUser(putativeRect.TopLeft()).y * appUnitsPerDevUnit;
1.4345 +}
1.4346 +
1.4347 +void
1.4348 +nsLayoutUtils::DrawString(const nsIFrame* aFrame,
1.4349 + nsRenderingContext* aContext,
1.4350 + const char16_t* aString,
1.4351 + int32_t aLength,
1.4352 + nsPoint aPoint,
1.4353 + nsStyleContext* aStyleContext)
1.4354 +{
1.4355 + nsresult rv = NS_ERROR_FAILURE;
1.4356 + nsPresContext* presContext = aFrame->PresContext();
1.4357 + if (presContext->BidiEnabled()) {
1.4358 + nsBidiLevel level =
1.4359 + nsBidiPresUtils::BidiLevelFromStyle(aStyleContext ?
1.4360 + aStyleContext : aFrame->StyleContext());
1.4361 + rv = nsBidiPresUtils::RenderText(aString, aLength, level,
1.4362 + presContext, *aContext, *aContext,
1.4363 + aPoint.x, aPoint.y);
1.4364 + }
1.4365 + if (NS_FAILED(rv))
1.4366 + {
1.4367 + aContext->SetTextRunRTL(false);
1.4368 + aContext->DrawString(aString, aLength, aPoint.x, aPoint.y);
1.4369 + }
1.4370 +}
1.4371 +
1.4372 +nscoord
1.4373 +nsLayoutUtils::GetStringWidth(const nsIFrame* aFrame,
1.4374 + nsRenderingContext* aContext,
1.4375 + const char16_t* aString,
1.4376 + int32_t aLength)
1.4377 +{
1.4378 + nsPresContext* presContext = aFrame->PresContext();
1.4379 + if (presContext->BidiEnabled()) {
1.4380 + nsBidiLevel level =
1.4381 + nsBidiPresUtils::BidiLevelFromStyle(aFrame->StyleContext());
1.4382 + return nsBidiPresUtils::MeasureTextWidth(aString, aLength,
1.4383 + level, presContext, *aContext);
1.4384 + }
1.4385 + aContext->SetTextRunRTL(false);
1.4386 + return aContext->GetWidth(aString, aLength);
1.4387 +}
1.4388 +
1.4389 +/* static */ void
1.4390 +nsLayoutUtils::PaintTextShadow(const nsIFrame* aFrame,
1.4391 + nsRenderingContext* aContext,
1.4392 + const nsRect& aTextRect,
1.4393 + const nsRect& aDirtyRect,
1.4394 + const nscolor& aForegroundColor,
1.4395 + TextShadowCallback aCallback,
1.4396 + void* aCallbackData)
1.4397 +{
1.4398 + const nsStyleText* textStyle = aFrame->StyleText();
1.4399 + if (!textStyle->HasTextShadow())
1.4400 + return;
1.4401 +
1.4402 + // Text shadow happens with the last value being painted at the back,
1.4403 + // ie. it is painted first.
1.4404 + gfxContext* aDestCtx = aContext->ThebesContext();
1.4405 + for (uint32_t i = textStyle->mTextShadow->Length(); i > 0; --i) {
1.4406 + nsCSSShadowItem* shadowDetails = textStyle->mTextShadow->ShadowAt(i - 1);
1.4407 + nsPoint shadowOffset(shadowDetails->mXOffset,
1.4408 + shadowDetails->mYOffset);
1.4409 + nscoord blurRadius = std::max(shadowDetails->mRadius, 0);
1.4410 +
1.4411 + nsRect shadowRect(aTextRect);
1.4412 + shadowRect.MoveBy(shadowOffset);
1.4413 +
1.4414 + nsPresContext* presCtx = aFrame->PresContext();
1.4415 + nsContextBoxBlur contextBoxBlur;
1.4416 + gfxContext* shadowContext = contextBoxBlur.Init(shadowRect, 0, blurRadius,
1.4417 + presCtx->AppUnitsPerDevPixel(),
1.4418 + aDestCtx, aDirtyRect, nullptr);
1.4419 + if (!shadowContext)
1.4420 + continue;
1.4421 +
1.4422 + nscolor shadowColor;
1.4423 + if (shadowDetails->mHasColor)
1.4424 + shadowColor = shadowDetails->mColor;
1.4425 + else
1.4426 + shadowColor = aForegroundColor;
1.4427 +
1.4428 + // Conjure an nsRenderingContext from a gfxContext for drawing the text
1.4429 + // to blur.
1.4430 + nsRefPtr<nsRenderingContext> renderingContext = new nsRenderingContext();
1.4431 + renderingContext->Init(presCtx->DeviceContext(), shadowContext);
1.4432 +
1.4433 + aDestCtx->Save();
1.4434 + aDestCtx->NewPath();
1.4435 + aDestCtx->SetColor(gfxRGBA(shadowColor));
1.4436 +
1.4437 + // The callback will draw whatever we want to blur as a shadow.
1.4438 + aCallback(renderingContext, shadowOffset, shadowColor, aCallbackData);
1.4439 +
1.4440 + contextBoxBlur.DoPaint();
1.4441 + aDestCtx->Restore();
1.4442 + }
1.4443 +}
1.4444 +
1.4445 +/* static */ nscoord
1.4446 +nsLayoutUtils::GetCenteredFontBaseline(nsFontMetrics* aFontMetrics,
1.4447 + nscoord aLineHeight)
1.4448 +{
1.4449 + nscoord fontAscent = aFontMetrics->MaxAscent();
1.4450 + nscoord fontHeight = aFontMetrics->MaxHeight();
1.4451 +
1.4452 + nscoord leading = aLineHeight - fontHeight;
1.4453 + return fontAscent + leading/2;
1.4454 +}
1.4455 +
1.4456 +
1.4457 +/* static */ bool
1.4458 +nsLayoutUtils::GetFirstLineBaseline(const nsIFrame* aFrame, nscoord* aResult)
1.4459 +{
1.4460 + LinePosition position;
1.4461 + if (!GetFirstLinePosition(aFrame, &position))
1.4462 + return false;
1.4463 + *aResult = position.mBaseline;
1.4464 + return true;
1.4465 +}
1.4466 +
1.4467 +/* static */ bool
1.4468 +nsLayoutUtils::GetFirstLinePosition(const nsIFrame* aFrame,
1.4469 + LinePosition* aResult)
1.4470 +{
1.4471 + const nsBlockFrame* block = nsLayoutUtils::GetAsBlock(const_cast<nsIFrame*>(aFrame));
1.4472 + if (!block) {
1.4473 + // For the first-line baseline we also have to check for a table, and if
1.4474 + // so, use the baseline of its first row.
1.4475 + nsIAtom* fType = aFrame->GetType();
1.4476 + if (fType == nsGkAtoms::tableOuterFrame) {
1.4477 + aResult->mTop = 0;
1.4478 + aResult->mBaseline = aFrame->GetBaseline();
1.4479 + // This is what we want for the list bullet caller; not sure if
1.4480 + // other future callers will want the same.
1.4481 + aResult->mBottom = aFrame->GetSize().height;
1.4482 + return true;
1.4483 + }
1.4484 +
1.4485 + // For first-line baselines, we have to consider scroll frames.
1.4486 + if (fType == nsGkAtoms::scrollFrame) {
1.4487 + nsIScrollableFrame *sFrame = do_QueryFrame(const_cast<nsIFrame*>(aFrame));
1.4488 + if (!sFrame) {
1.4489 + NS_NOTREACHED("not scroll frame");
1.4490 + }
1.4491 + LinePosition kidPosition;
1.4492 + if (GetFirstLinePosition(sFrame->GetScrolledFrame(), &kidPosition)) {
1.4493 + // Consider only the border and padding that contributes to the
1.4494 + // kid's position, not the scrolling, so we get the initial
1.4495 + // position.
1.4496 + *aResult = kidPosition + aFrame->GetUsedBorderAndPadding().top;
1.4497 + return true;
1.4498 + }
1.4499 + return false;
1.4500 + }
1.4501 +
1.4502 + if (fType == nsGkAtoms::fieldSetFrame) {
1.4503 + LinePosition kidPosition;
1.4504 + nsIFrame* kid = aFrame->GetFirstPrincipalChild();
1.4505 + // kid might be a legend frame here, but that's ok.
1.4506 + if (GetFirstLinePosition(kid, &kidPosition)) {
1.4507 + *aResult = kidPosition + kid->GetNormalPosition().y;
1.4508 + return true;
1.4509 + }
1.4510 + return false;
1.4511 + }
1.4512 +
1.4513 + // No baseline.
1.4514 + return false;
1.4515 + }
1.4516 +
1.4517 + for (nsBlockFrame::const_line_iterator line = block->begin_lines(),
1.4518 + line_end = block->end_lines();
1.4519 + line != line_end; ++line) {
1.4520 + if (line->IsBlock()) {
1.4521 + nsIFrame *kid = line->mFirstChild;
1.4522 + LinePosition kidPosition;
1.4523 + if (GetFirstLinePosition(kid, &kidPosition)) {
1.4524 + *aResult = kidPosition + kid->GetNormalPosition().y;
1.4525 + return true;
1.4526 + }
1.4527 + } else {
1.4528 + // XXX Is this the right test? We have some bogus empty lines
1.4529 + // floating around, but IsEmpty is perhaps too weak.
1.4530 + if (line->BSize() != 0 || !line->IsEmpty()) {
1.4531 + nscoord top = line->BStart();
1.4532 + aResult->mTop = top;
1.4533 + aResult->mBaseline = top + line->GetAscent();
1.4534 + aResult->mBottom = top + line->BSize();
1.4535 + return true;
1.4536 + }
1.4537 + }
1.4538 + }
1.4539 + return false;
1.4540 +}
1.4541 +
1.4542 +/* static */ bool
1.4543 +nsLayoutUtils::GetLastLineBaseline(const nsIFrame* aFrame, nscoord* aResult)
1.4544 +{
1.4545 + const nsBlockFrame* block = nsLayoutUtils::GetAsBlock(const_cast<nsIFrame*>(aFrame));
1.4546 + if (!block)
1.4547 + // No baseline. (We intentionally don't descend into scroll frames.)
1.4548 + return false;
1.4549 +
1.4550 + for (nsBlockFrame::const_reverse_line_iterator line = block->rbegin_lines(),
1.4551 + line_end = block->rend_lines();
1.4552 + line != line_end; ++line) {
1.4553 + if (line->IsBlock()) {
1.4554 + nsIFrame *kid = line->mFirstChild;
1.4555 + nscoord kidBaseline;
1.4556 + if (GetLastLineBaseline(kid, &kidBaseline)) {
1.4557 + // Ignore relative positioning for baseline calculations
1.4558 + *aResult = kidBaseline + kid->GetNormalPosition().y;
1.4559 + return true;
1.4560 + } else if (kid->GetType() == nsGkAtoms::scrollFrame) {
1.4561 + // Use the bottom of the scroll frame.
1.4562 + // XXX CSS2.1 really doesn't say what to do here.
1.4563 + *aResult = kid->GetNormalPosition().y + kid->GetRect().height;
1.4564 + return true;
1.4565 + }
1.4566 + } else {
1.4567 + // XXX Is this the right test? We have some bogus empty lines
1.4568 + // floating around, but IsEmpty is perhaps too weak.
1.4569 + if (line->BSize() != 0 || !line->IsEmpty()) {
1.4570 + *aResult = line->BStart() + line->GetAscent();
1.4571 + return true;
1.4572 + }
1.4573 + }
1.4574 + }
1.4575 + return false;
1.4576 +}
1.4577 +
1.4578 +static nscoord
1.4579 +CalculateBlockContentBottom(nsBlockFrame* aFrame)
1.4580 +{
1.4581 + NS_PRECONDITION(aFrame, "null ptr");
1.4582 +
1.4583 + nscoord contentBottom = 0;
1.4584 +
1.4585 + for (nsBlockFrame::line_iterator line = aFrame->begin_lines(),
1.4586 + line_end = aFrame->end_lines();
1.4587 + line != line_end; ++line) {
1.4588 + if (line->IsBlock()) {
1.4589 + nsIFrame* child = line->mFirstChild;
1.4590 + nscoord offset = child->GetNormalPosition().y;
1.4591 + contentBottom = std::max(contentBottom,
1.4592 + nsLayoutUtils::CalculateContentBottom(child) + offset);
1.4593 + }
1.4594 + else {
1.4595 + contentBottom = std::max(contentBottom, line->BEnd());
1.4596 + }
1.4597 + }
1.4598 + return contentBottom;
1.4599 +}
1.4600 +
1.4601 +/* static */ nscoord
1.4602 +nsLayoutUtils::CalculateContentBottom(nsIFrame* aFrame)
1.4603 +{
1.4604 + NS_PRECONDITION(aFrame, "null ptr");
1.4605 +
1.4606 + nscoord contentBottom = aFrame->GetRect().height;
1.4607 +
1.4608 + // We want scrollable overflow rather than visual because this
1.4609 + // calculation is intended to affect layout.
1.4610 + if (aFrame->GetScrollableOverflowRect().height > contentBottom) {
1.4611 + nsIFrame::ChildListIDs skip(nsIFrame::kOverflowList |
1.4612 + nsIFrame::kExcessOverflowContainersList |
1.4613 + nsIFrame::kOverflowOutOfFlowList);
1.4614 + nsBlockFrame* blockFrame = GetAsBlock(aFrame);
1.4615 + if (blockFrame) {
1.4616 + contentBottom =
1.4617 + std::max(contentBottom, CalculateBlockContentBottom(blockFrame));
1.4618 + skip |= nsIFrame::kPrincipalList;
1.4619 + }
1.4620 + nsIFrame::ChildListIterator lists(aFrame);
1.4621 + for (; !lists.IsDone(); lists.Next()) {
1.4622 + if (!skip.Contains(lists.CurrentID())) {
1.4623 + nsFrameList::Enumerator childFrames(lists.CurrentList());
1.4624 + for (; !childFrames.AtEnd(); childFrames.Next()) {
1.4625 + nsIFrame* child = childFrames.get();
1.4626 + nscoord offset = child->GetNormalPosition().y;
1.4627 + contentBottom = std::max(contentBottom,
1.4628 + CalculateContentBottom(child) + offset);
1.4629 + }
1.4630 + }
1.4631 + }
1.4632 + }
1.4633 + return contentBottom;
1.4634 +}
1.4635 +
1.4636 +/* static */ nsIFrame*
1.4637 +nsLayoutUtils::GetClosestLayer(nsIFrame* aFrame)
1.4638 +{
1.4639 + nsIFrame* layer;
1.4640 + for (layer = aFrame; layer; layer = layer->GetParent()) {
1.4641 + if (layer->IsPositioned() ||
1.4642 + (layer->GetParent() &&
1.4643 + layer->GetParent()->GetType() == nsGkAtoms::scrollFrame))
1.4644 + break;
1.4645 + }
1.4646 + if (layer)
1.4647 + return layer;
1.4648 + return aFrame->PresContext()->PresShell()->FrameManager()->GetRootFrame();
1.4649 +}
1.4650 +
1.4651 +GraphicsFilter
1.4652 +nsLayoutUtils::GetGraphicsFilterForFrame(nsIFrame* aForFrame)
1.4653 +{
1.4654 + GraphicsFilter defaultFilter = GraphicsFilter::FILTER_GOOD;
1.4655 + nsStyleContext *sc;
1.4656 + if (nsCSSRendering::IsCanvasFrame(aForFrame)) {
1.4657 + nsCSSRendering::FindBackground(aForFrame, &sc);
1.4658 + } else {
1.4659 + sc = aForFrame->StyleContext();
1.4660 + }
1.4661 +
1.4662 + switch (sc->StyleSVG()->mImageRendering) {
1.4663 + case NS_STYLE_IMAGE_RENDERING_OPTIMIZESPEED:
1.4664 + return GraphicsFilter::FILTER_FAST;
1.4665 + case NS_STYLE_IMAGE_RENDERING_OPTIMIZEQUALITY:
1.4666 + return GraphicsFilter::FILTER_BEST;
1.4667 + case NS_STYLE_IMAGE_RENDERING_CRISPEDGES:
1.4668 + return GraphicsFilter::FILTER_NEAREST;
1.4669 + default:
1.4670 + return defaultFilter;
1.4671 + }
1.4672 +}
1.4673 +
1.4674 +/**
1.4675 + * Given an image being drawn into an appunit coordinate system, and
1.4676 + * a point in that coordinate system, map the point back into image
1.4677 + * pixel space.
1.4678 + * @param aSize the size of the image, in pixels
1.4679 + * @param aDest the rectangle that the image is being mapped into
1.4680 + * @param aPt a point in the same coordinate system as the rectangle
1.4681 + */
1.4682 +static gfxPoint
1.4683 +MapToFloatImagePixels(const gfxSize& aSize,
1.4684 + const gfxRect& aDest, const gfxPoint& aPt)
1.4685 +{
1.4686 + return gfxPoint(((aPt.x - aDest.X())*aSize.width)/aDest.Width(),
1.4687 + ((aPt.y - aDest.Y())*aSize.height)/aDest.Height());
1.4688 +}
1.4689 +
1.4690 +/**
1.4691 + * Given an image being drawn into an pixel-based coordinate system, and
1.4692 + * a point in image space, map the point into the pixel-based coordinate
1.4693 + * system.
1.4694 + * @param aSize the size of the image, in pixels
1.4695 + * @param aDest the rectangle that the image is being mapped into
1.4696 + * @param aPt a point in image space
1.4697 + */
1.4698 +static gfxPoint
1.4699 +MapToFloatUserPixels(const gfxSize& aSize,
1.4700 + const gfxRect& aDest, const gfxPoint& aPt)
1.4701 +{
1.4702 + return gfxPoint(aPt.x*aDest.Width()/aSize.width + aDest.X(),
1.4703 + aPt.y*aDest.Height()/aSize.height + aDest.Y());
1.4704 +}
1.4705 +
1.4706 +/* static */ gfxRect
1.4707 +nsLayoutUtils::RectToGfxRect(const nsRect& aRect, int32_t aAppUnitsPerDevPixel)
1.4708 +{
1.4709 + return gfxRect(gfxFloat(aRect.x) / aAppUnitsPerDevPixel,
1.4710 + gfxFloat(aRect.y) / aAppUnitsPerDevPixel,
1.4711 + gfxFloat(aRect.width) / aAppUnitsPerDevPixel,
1.4712 + gfxFloat(aRect.height) / aAppUnitsPerDevPixel);
1.4713 +}
1.4714 +
1.4715 +struct SnappedImageDrawingParameters {
1.4716 + // A transform from either device space or user space (depending on mResetCTM)
1.4717 + // to image space
1.4718 + gfxMatrix mUserSpaceToImageSpace;
1.4719 + // A device-space, pixel-aligned rectangle to fill
1.4720 + gfxRect mFillRect;
1.4721 + // A pixel rectangle in tiled image space outside of which gfx should not
1.4722 + // sample (using EXTEND_PAD as necessary)
1.4723 + nsIntRect mSubimage;
1.4724 + // Whether there's anything to draw at all
1.4725 + bool mShouldDraw;
1.4726 + // true iff the CTM of the rendering context needs to be reset to the
1.4727 + // identity matrix before drawing
1.4728 + bool mResetCTM;
1.4729 +
1.4730 + SnappedImageDrawingParameters()
1.4731 + : mShouldDraw(false)
1.4732 + , mResetCTM(false)
1.4733 + {}
1.4734 +
1.4735 + SnappedImageDrawingParameters(const gfxMatrix& aUserSpaceToImageSpace,
1.4736 + const gfxRect& aFillRect,
1.4737 + const nsIntRect& aSubimage,
1.4738 + bool aResetCTM)
1.4739 + : mUserSpaceToImageSpace(aUserSpaceToImageSpace)
1.4740 + , mFillRect(aFillRect)
1.4741 + , mSubimage(aSubimage)
1.4742 + , mShouldDraw(true)
1.4743 + , mResetCTM(aResetCTM)
1.4744 + {}
1.4745 +};
1.4746 +
1.4747 +/**
1.4748 + * Given a set of input parameters, compute certain output parameters
1.4749 + * for drawing an image with the image snapping algorithm.
1.4750 + * See https://wiki.mozilla.org/Gecko:Image_Snapping_and_Rendering
1.4751 + *
1.4752 + * @see nsLayoutUtils::DrawImage() for the descriptions of input parameters
1.4753 + */
1.4754 +static SnappedImageDrawingParameters
1.4755 +ComputeSnappedImageDrawingParameters(gfxContext* aCtx,
1.4756 + int32_t aAppUnitsPerDevPixel,
1.4757 + const nsRect aDest,
1.4758 + const nsRect aFill,
1.4759 + const nsPoint aAnchor,
1.4760 + const nsRect aDirty,
1.4761 + const nsIntSize aImageSize)
1.4762 +
1.4763 +{
1.4764 + if (aDest.IsEmpty() || aFill.IsEmpty() || !aImageSize.width || !aImageSize.height)
1.4765 + return SnappedImageDrawingParameters();
1.4766 +
1.4767 + gfxRect devPixelDest =
1.4768 + nsLayoutUtils::RectToGfxRect(aDest, aAppUnitsPerDevPixel);
1.4769 + gfxRect devPixelFill =
1.4770 + nsLayoutUtils::RectToGfxRect(aFill, aAppUnitsPerDevPixel);
1.4771 + gfxRect devPixelDirty =
1.4772 + nsLayoutUtils::RectToGfxRect(aDirty, aAppUnitsPerDevPixel);
1.4773 +
1.4774 + gfxMatrix currentMatrix = aCtx->CurrentMatrix();
1.4775 + gfxRect fill = devPixelFill;
1.4776 + bool didSnap;
1.4777 + // Snap even if we have a scale in the context. But don't snap if
1.4778 + // we have something that's not translation+scale, or if the scale flips in
1.4779 + // the X or Y direction, because snapped image drawing can't handle that yet.
1.4780 + if (!currentMatrix.HasNonAxisAlignedTransform() &&
1.4781 + currentMatrix.xx > 0.0 && currentMatrix.yy > 0.0 &&
1.4782 + aCtx->UserToDevicePixelSnapped(fill, true)) {
1.4783 + didSnap = true;
1.4784 + if (fill.IsEmpty()) {
1.4785 + return SnappedImageDrawingParameters();
1.4786 + }
1.4787 + } else {
1.4788 + didSnap = false;
1.4789 + fill = devPixelFill;
1.4790 + }
1.4791 +
1.4792 + gfxSize imageSize(aImageSize.width, aImageSize.height);
1.4793 +
1.4794 + // Compute the set of pixels that would be sampled by an ideal rendering
1.4795 + gfxPoint subimageTopLeft =
1.4796 + MapToFloatImagePixels(imageSize, devPixelDest, devPixelFill.TopLeft());
1.4797 + gfxPoint subimageBottomRight =
1.4798 + MapToFloatImagePixels(imageSize, devPixelDest, devPixelFill.BottomRight());
1.4799 + nsIntRect intSubimage;
1.4800 + intSubimage.MoveTo(NSToIntFloor(subimageTopLeft.x),
1.4801 + NSToIntFloor(subimageTopLeft.y));
1.4802 + intSubimage.SizeTo(NSToIntCeil(subimageBottomRight.x) - intSubimage.x,
1.4803 + NSToIntCeil(subimageBottomRight.y) - intSubimage.y);
1.4804 +
1.4805 + // Compute the anchor point and compute final fill rect.
1.4806 + // This code assumes that pixel-based devices have one pixel per
1.4807 + // device unit!
1.4808 + gfxPoint anchorPoint(gfxFloat(aAnchor.x)/aAppUnitsPerDevPixel,
1.4809 + gfxFloat(aAnchor.y)/aAppUnitsPerDevPixel);
1.4810 + gfxPoint imageSpaceAnchorPoint =
1.4811 + MapToFloatImagePixels(imageSize, devPixelDest, anchorPoint);
1.4812 +
1.4813 + if (didSnap) {
1.4814 + imageSpaceAnchorPoint.Round();
1.4815 + anchorPoint = imageSpaceAnchorPoint;
1.4816 + anchorPoint = MapToFloatUserPixels(imageSize, devPixelDest, anchorPoint);
1.4817 + anchorPoint = currentMatrix.Transform(anchorPoint);
1.4818 + anchorPoint.Round();
1.4819 +
1.4820 + // This form of Transform is safe to call since non-axis-aligned
1.4821 + // transforms wouldn't be snapped.
1.4822 + devPixelDirty = currentMatrix.Transform(devPixelDirty);
1.4823 + }
1.4824 +
1.4825 + gfxFloat scaleX = imageSize.width*aAppUnitsPerDevPixel/aDest.width;
1.4826 + gfxFloat scaleY = imageSize.height*aAppUnitsPerDevPixel/aDest.height;
1.4827 + if (didSnap) {
1.4828 + // We'll reset aCTX to the identity matrix before drawing, so we need to
1.4829 + // adjust our scales to match.
1.4830 + scaleX /= currentMatrix.xx;
1.4831 + scaleY /= currentMatrix.yy;
1.4832 + }
1.4833 + gfxFloat translateX = imageSpaceAnchorPoint.x - anchorPoint.x*scaleX;
1.4834 + gfxFloat translateY = imageSpaceAnchorPoint.y - anchorPoint.y*scaleY;
1.4835 + gfxMatrix transform(scaleX, 0, 0, scaleY, translateX, translateY);
1.4836 +
1.4837 + gfxRect finalFillRect = fill;
1.4838 + // If the user-space-to-image-space transform is not a straight
1.4839 + // translation by integers, then filtering will occur, and
1.4840 + // restricting the fill rect to the dirty rect would change the values
1.4841 + // computed for edge pixels, which we can't allow.
1.4842 + // Also, if didSnap is false then rounding out 'devPixelDirty' might not
1.4843 + // produce pixel-aligned coordinates, which would also break the values
1.4844 + // computed for edge pixels.
1.4845 + if (didSnap && !transform.HasNonIntegerTranslation()) {
1.4846 + devPixelDirty.RoundOut();
1.4847 + finalFillRect = fill.Intersect(devPixelDirty);
1.4848 + }
1.4849 + if (finalFillRect.IsEmpty())
1.4850 + return SnappedImageDrawingParameters();
1.4851 +
1.4852 + return SnappedImageDrawingParameters(transform, finalFillRect, intSubimage,
1.4853 + didSnap);
1.4854 +}
1.4855 +
1.4856 +
1.4857 +static nsresult
1.4858 +DrawImageInternal(nsRenderingContext* aRenderingContext,
1.4859 + imgIContainer* aImage,
1.4860 + GraphicsFilter aGraphicsFilter,
1.4861 + const nsRect& aDest,
1.4862 + const nsRect& aFill,
1.4863 + const nsPoint& aAnchor,
1.4864 + const nsRect& aDirty,
1.4865 + const nsIntSize& aImageSize,
1.4866 + const SVGImageContext* aSVGContext,
1.4867 + uint32_t aImageFlags)
1.4868 +{
1.4869 + if (aDest.Contains(aFill)) {
1.4870 + aImageFlags |= imgIContainer::FLAG_CLAMP;
1.4871 + }
1.4872 + int32_t appUnitsPerDevPixel = aRenderingContext->AppUnitsPerDevPixel();
1.4873 + gfxContext* ctx = aRenderingContext->ThebesContext();
1.4874 +
1.4875 + SnappedImageDrawingParameters drawingParams =
1.4876 + ComputeSnappedImageDrawingParameters(ctx, appUnitsPerDevPixel, aDest, aFill,
1.4877 + aAnchor, aDirty, aImageSize);
1.4878 +
1.4879 + if (!drawingParams.mShouldDraw)
1.4880 + return NS_OK;
1.4881 +
1.4882 + gfxContextMatrixAutoSaveRestore saveMatrix(ctx);
1.4883 + if (drawingParams.mResetCTM) {
1.4884 + ctx->IdentityMatrix();
1.4885 + }
1.4886 +
1.4887 + aImage->Draw(ctx, aGraphicsFilter, drawingParams.mUserSpaceToImageSpace,
1.4888 + drawingParams.mFillRect, drawingParams.mSubimage, aImageSize,
1.4889 + aSVGContext, imgIContainer::FRAME_CURRENT, aImageFlags);
1.4890 + return NS_OK;
1.4891 +}
1.4892 +
1.4893 +/* static */ void
1.4894 +nsLayoutUtils::DrawPixelSnapped(nsRenderingContext* aRenderingContext,
1.4895 + gfxDrawable* aDrawable,
1.4896 + GraphicsFilter aFilter,
1.4897 + const nsRect& aDest,
1.4898 + const nsRect& aFill,
1.4899 + const nsPoint& aAnchor,
1.4900 + const nsRect& aDirty)
1.4901 +{
1.4902 + int32_t appUnitsPerDevPixel = aRenderingContext->AppUnitsPerDevPixel();
1.4903 + gfxContext* ctx = aRenderingContext->ThebesContext();
1.4904 + gfxIntSize drawableSize = aDrawable->Size();
1.4905 + nsIntSize imageSize(drawableSize.width, drawableSize.height);
1.4906 +
1.4907 + SnappedImageDrawingParameters drawingParams =
1.4908 + ComputeSnappedImageDrawingParameters(ctx, appUnitsPerDevPixel, aDest, aFill,
1.4909 + aAnchor, aDirty, imageSize);
1.4910 +
1.4911 + if (!drawingParams.mShouldDraw)
1.4912 + return;
1.4913 +
1.4914 + gfxContextMatrixAutoSaveRestore saveMatrix(ctx);
1.4915 + if (drawingParams.mResetCTM) {
1.4916 + ctx->IdentityMatrix();
1.4917 + }
1.4918 +
1.4919 + gfxRect sourceRect =
1.4920 + drawingParams.mUserSpaceToImageSpace.Transform(drawingParams.mFillRect);
1.4921 + gfxRect imageRect(0, 0, imageSize.width, imageSize.height);
1.4922 + gfxRect subimage(drawingParams.mSubimage.x, drawingParams.mSubimage.y,
1.4923 + drawingParams.mSubimage.width, drawingParams.mSubimage.height);
1.4924 +
1.4925 + NS_ASSERTION(!sourceRect.Intersect(subimage).IsEmpty(),
1.4926 + "We must be allowed to sample *some* source pixels!");
1.4927 +
1.4928 + gfxUtils::DrawPixelSnapped(ctx, aDrawable,
1.4929 + drawingParams.mUserSpaceToImageSpace, subimage,
1.4930 + sourceRect, imageRect, drawingParams.mFillRect,
1.4931 + gfxImageFormat::ARGB32, aFilter);
1.4932 +}
1.4933 +
1.4934 +/* static */ nsresult
1.4935 +nsLayoutUtils::DrawSingleUnscaledImage(nsRenderingContext* aRenderingContext,
1.4936 + imgIContainer* aImage,
1.4937 + GraphicsFilter aGraphicsFilter,
1.4938 + const nsPoint& aDest,
1.4939 + const nsRect* aDirty,
1.4940 + uint32_t aImageFlags,
1.4941 + const nsRect* aSourceArea)
1.4942 +{
1.4943 + nsIntSize imageSize;
1.4944 + aImage->GetWidth(&imageSize.width);
1.4945 + aImage->GetHeight(&imageSize.height);
1.4946 + NS_ENSURE_TRUE(imageSize.width > 0 && imageSize.height > 0, NS_ERROR_FAILURE);
1.4947 +
1.4948 + nscoord appUnitsPerCSSPixel = nsDeviceContext::AppUnitsPerCSSPixel();
1.4949 + nsSize size(imageSize.width*appUnitsPerCSSPixel,
1.4950 + imageSize.height*appUnitsPerCSSPixel);
1.4951 +
1.4952 + nsRect source;
1.4953 + if (aSourceArea) {
1.4954 + source = *aSourceArea;
1.4955 + } else {
1.4956 + source.SizeTo(size);
1.4957 + }
1.4958 +
1.4959 + nsRect dest(aDest - source.TopLeft(), size);
1.4960 + nsRect fill(aDest, source.Size());
1.4961 + // Ensure that only a single image tile is drawn. If aSourceArea extends
1.4962 + // outside the image bounds, we want to honor the aSourceArea-to-aDest
1.4963 + // translation but we don't want to actually tile the image.
1.4964 + fill.IntersectRect(fill, dest);
1.4965 + return DrawImageInternal(aRenderingContext, aImage, aGraphicsFilter,
1.4966 + dest, fill, aDest, aDirty ? *aDirty : dest,
1.4967 + imageSize, nullptr, aImageFlags);
1.4968 +}
1.4969 +
1.4970 +/* static */ nsresult
1.4971 +nsLayoutUtils::DrawSingleImage(nsRenderingContext* aRenderingContext,
1.4972 + imgIContainer* aImage,
1.4973 + GraphicsFilter aGraphicsFilter,
1.4974 + const nsRect& aDest,
1.4975 + const nsRect& aDirty,
1.4976 + const SVGImageContext* aSVGContext,
1.4977 + uint32_t aImageFlags,
1.4978 + const nsRect* aSourceArea)
1.4979 +{
1.4980 + nsIntSize imageSize;
1.4981 + if (aImage->GetType() == imgIContainer::TYPE_VECTOR) {
1.4982 + // We choose a size for vector images that emulates a raster image which
1.4983 + // is perfectly sized for the destination rect: each pixel in the image
1.4984 + // maps exactly to a single pixel on-screen.
1.4985 + nscoord appUnitsPerDevPx = aRenderingContext->AppUnitsPerDevPixel();
1.4986 + imageSize.width = NSAppUnitsToIntPixels(aDest.width, appUnitsPerDevPx);
1.4987 + imageSize.height = NSAppUnitsToIntPixels(aDest.height, appUnitsPerDevPx);
1.4988 + } else {
1.4989 + // Raster images have an intrinsic size, so we just use that.
1.4990 + aImage->GetWidth(&imageSize.width);
1.4991 + aImage->GetHeight(&imageSize.height);
1.4992 + }
1.4993 + NS_ENSURE_TRUE(imageSize.width > 0 && imageSize.height > 0, NS_ERROR_FAILURE);
1.4994 +
1.4995 + nsRect source;
1.4996 + if (aSourceArea) {
1.4997 + source = *aSourceArea;
1.4998 + } else {
1.4999 + nscoord appUnitsPerCSSPixel = nsDeviceContext::AppUnitsPerCSSPixel();
1.5000 + source.SizeTo(imageSize.width*appUnitsPerCSSPixel,
1.5001 + imageSize.height*appUnitsPerCSSPixel);
1.5002 + }
1.5003 +
1.5004 + nsRect dest = nsLayoutUtils::GetWholeImageDestination(imageSize, source,
1.5005 + aDest);
1.5006 + // Ensure that only a single image tile is drawn. If aSourceArea extends
1.5007 + // outside the image bounds, we want to honor the aSourceArea-to-aDest
1.5008 + // transform but we don't want to actually tile the image.
1.5009 + nsRect fill;
1.5010 + fill.IntersectRect(aDest, dest);
1.5011 + return DrawImageInternal(aRenderingContext, aImage, aGraphicsFilter, dest, fill,
1.5012 + fill.TopLeft(), aDirty, imageSize, aSVGContext, aImageFlags);
1.5013 +}
1.5014 +
1.5015 +/* static */ void
1.5016 +nsLayoutUtils::ComputeSizeForDrawing(imgIContainer *aImage,
1.5017 + nsIntSize& aImageSize, /*outparam*/
1.5018 + nsSize& aIntrinsicRatio, /*outparam*/
1.5019 + bool& aGotWidth, /*outparam*/
1.5020 + bool& aGotHeight /*outparam*/)
1.5021 +{
1.5022 + aGotWidth = NS_SUCCEEDED(aImage->GetWidth(&aImageSize.width));
1.5023 + aGotHeight = NS_SUCCEEDED(aImage->GetHeight(&aImageSize.height));
1.5024 + bool gotRatio = NS_SUCCEEDED(aImage->GetIntrinsicRatio(&aIntrinsicRatio));
1.5025 +
1.5026 + if (!(aGotWidth && aGotHeight) && !gotRatio) {
1.5027 + // We hit an error (say, because the image failed to load or couldn't be
1.5028 + // decoded) and should return zero size.
1.5029 + aGotWidth = aGotHeight = true;
1.5030 + aImageSize = nsIntSize(0, 0);
1.5031 + aIntrinsicRatio = nsSize(0, 0);
1.5032 + }
1.5033 +}
1.5034 +
1.5035 +
1.5036 +/* static */ nsresult
1.5037 +nsLayoutUtils::DrawBackgroundImage(nsRenderingContext* aRenderingContext,
1.5038 + imgIContainer* aImage,
1.5039 + const nsIntSize& aImageSize,
1.5040 + GraphicsFilter aGraphicsFilter,
1.5041 + const nsRect& aDest,
1.5042 + const nsRect& aFill,
1.5043 + const nsPoint& aAnchor,
1.5044 + const nsRect& aDirty,
1.5045 + uint32_t aImageFlags)
1.5046 +{
1.5047 + PROFILER_LABEL("layout", "nsLayoutUtils::DrawBackgroundImage");
1.5048 +
1.5049 + if (UseBackgroundNearestFiltering()) {
1.5050 + aGraphicsFilter = GraphicsFilter::FILTER_NEAREST;
1.5051 + }
1.5052 +
1.5053 + return DrawImageInternal(aRenderingContext, aImage, aGraphicsFilter,
1.5054 + aDest, aFill, aAnchor, aDirty,
1.5055 + aImageSize, nullptr, aImageFlags);
1.5056 +}
1.5057 +
1.5058 +/* static */ nsresult
1.5059 +nsLayoutUtils::DrawImage(nsRenderingContext* aRenderingContext,
1.5060 + imgIContainer* aImage,
1.5061 + GraphicsFilter aGraphicsFilter,
1.5062 + const nsRect& aDest,
1.5063 + const nsRect& aFill,
1.5064 + const nsPoint& aAnchor,
1.5065 + const nsRect& aDirty,
1.5066 + uint32_t aImageFlags)
1.5067 +{
1.5068 + nsIntSize imageSize;
1.5069 + nsSize imageRatio;
1.5070 + bool gotHeight, gotWidth;
1.5071 + ComputeSizeForDrawing(aImage, imageSize, imageRatio, gotWidth, gotHeight);
1.5072 +
1.5073 + // XXX Dimensionless images shouldn't fall back to filled-area size -- the
1.5074 + // caller should provide the image size, a la DrawBackgroundImage.
1.5075 + if (gotWidth != gotHeight) {
1.5076 + if (!gotWidth) {
1.5077 + if (imageRatio.height != 0) {
1.5078 + imageSize.width =
1.5079 + NSCoordSaturatingNonnegativeMultiply(imageSize.height,
1.5080 + float(imageRatio.width) /
1.5081 + float(imageRatio.height));
1.5082 + gotWidth = true;
1.5083 + }
1.5084 + } else {
1.5085 + if (imageRatio.width != 0) {
1.5086 + imageSize.height =
1.5087 + NSCoordSaturatingNonnegativeMultiply(imageSize.width,
1.5088 + float(imageRatio.height) /
1.5089 + float(imageRatio.width));
1.5090 + gotHeight = true;
1.5091 + }
1.5092 + }
1.5093 + }
1.5094 +
1.5095 + if (!gotWidth) {
1.5096 + imageSize.width = nsPresContext::AppUnitsToIntCSSPixels(aFill.width);
1.5097 + }
1.5098 + if (!gotHeight) {
1.5099 + imageSize.height = nsPresContext::AppUnitsToIntCSSPixels(aFill.height);
1.5100 + }
1.5101 +
1.5102 + return DrawImageInternal(aRenderingContext, aImage, aGraphicsFilter,
1.5103 + aDest, aFill, aAnchor, aDirty,
1.5104 + imageSize, nullptr, aImageFlags);
1.5105 +}
1.5106 +
1.5107 +/* static */ nsRect
1.5108 +nsLayoutUtils::GetWholeImageDestination(const nsIntSize& aWholeImageSize,
1.5109 + const nsRect& aImageSourceArea,
1.5110 + const nsRect& aDestArea)
1.5111 +{
1.5112 + double scaleX = double(aDestArea.width)/aImageSourceArea.width;
1.5113 + double scaleY = double(aDestArea.height)/aImageSourceArea.height;
1.5114 + nscoord destOffsetX = NSToCoordRound(aImageSourceArea.x*scaleX);
1.5115 + nscoord destOffsetY = NSToCoordRound(aImageSourceArea.y*scaleY);
1.5116 + nscoord appUnitsPerCSSPixel = nsDeviceContext::AppUnitsPerCSSPixel();
1.5117 + nscoord wholeSizeX = NSToCoordRound(aWholeImageSize.width*appUnitsPerCSSPixel*scaleX);
1.5118 + nscoord wholeSizeY = NSToCoordRound(aWholeImageSize.height*appUnitsPerCSSPixel*scaleY);
1.5119 + return nsRect(aDestArea.TopLeft() - nsPoint(destOffsetX, destOffsetY),
1.5120 + nsSize(wholeSizeX, wholeSizeY));
1.5121 +}
1.5122 +
1.5123 +/* static */ already_AddRefed<imgIContainer>
1.5124 +nsLayoutUtils::OrientImage(imgIContainer* aContainer,
1.5125 + const nsStyleImageOrientation& aOrientation)
1.5126 +{
1.5127 + MOZ_ASSERT(aContainer, "Should have an image container");
1.5128 + nsCOMPtr<imgIContainer> img(aContainer);
1.5129 +
1.5130 + if (aOrientation.IsFromImage()) {
1.5131 + img = ImageOps::Orient(img, img->GetOrientation());
1.5132 + } else if (!aOrientation.IsDefault()) {
1.5133 + Angle angle = aOrientation.Angle();
1.5134 + Flip flip = aOrientation.IsFlipped() ? Flip::Horizontal
1.5135 + : Flip::Unflipped;
1.5136 + img = ImageOps::Orient(img, Orientation(angle, flip));
1.5137 + }
1.5138 +
1.5139 + return img.forget();
1.5140 +}
1.5141 +
1.5142 +static bool NonZeroStyleCoord(const nsStyleCoord& aCoord)
1.5143 +{
1.5144 + if (aCoord.IsCoordPercentCalcUnit()) {
1.5145 + // Since negative results are clamped to 0, check > 0.
1.5146 + return nsRuleNode::ComputeCoordPercentCalc(aCoord, nscoord_MAX) > 0 ||
1.5147 + nsRuleNode::ComputeCoordPercentCalc(aCoord, 0) > 0;
1.5148 + }
1.5149 +
1.5150 + return true;
1.5151 +}
1.5152 +
1.5153 +/* static */ bool
1.5154 +nsLayoutUtils::HasNonZeroCorner(const nsStyleCorners& aCorners)
1.5155 +{
1.5156 + NS_FOR_CSS_HALF_CORNERS(corner) {
1.5157 + if (NonZeroStyleCoord(aCorners.Get(corner)))
1.5158 + return true;
1.5159 + }
1.5160 + return false;
1.5161 +}
1.5162 +
1.5163 +// aCorner is a "full corner" value, i.e. NS_CORNER_TOP_LEFT etc
1.5164 +static bool IsCornerAdjacentToSide(uint8_t aCorner, css::Side aSide)
1.5165 +{
1.5166 + PR_STATIC_ASSERT((int)NS_SIDE_TOP == NS_CORNER_TOP_LEFT);
1.5167 + PR_STATIC_ASSERT((int)NS_SIDE_RIGHT == NS_CORNER_TOP_RIGHT);
1.5168 + PR_STATIC_ASSERT((int)NS_SIDE_BOTTOM == NS_CORNER_BOTTOM_RIGHT);
1.5169 + PR_STATIC_ASSERT((int)NS_SIDE_LEFT == NS_CORNER_BOTTOM_LEFT);
1.5170 + PR_STATIC_ASSERT((int)NS_SIDE_TOP == ((NS_CORNER_TOP_RIGHT - 1)&3));
1.5171 + PR_STATIC_ASSERT((int)NS_SIDE_RIGHT == ((NS_CORNER_BOTTOM_RIGHT - 1)&3));
1.5172 + PR_STATIC_ASSERT((int)NS_SIDE_BOTTOM == ((NS_CORNER_BOTTOM_LEFT - 1)&3));
1.5173 + PR_STATIC_ASSERT((int)NS_SIDE_LEFT == ((NS_CORNER_TOP_LEFT - 1)&3));
1.5174 +
1.5175 + return aSide == aCorner || aSide == ((aCorner - 1)&3);
1.5176 +}
1.5177 +
1.5178 +/* static */ bool
1.5179 +nsLayoutUtils::HasNonZeroCornerOnSide(const nsStyleCorners& aCorners,
1.5180 + css::Side aSide)
1.5181 +{
1.5182 + PR_STATIC_ASSERT(NS_CORNER_TOP_LEFT_X/2 == NS_CORNER_TOP_LEFT);
1.5183 + PR_STATIC_ASSERT(NS_CORNER_TOP_LEFT_Y/2 == NS_CORNER_TOP_LEFT);
1.5184 + PR_STATIC_ASSERT(NS_CORNER_TOP_RIGHT_X/2 == NS_CORNER_TOP_RIGHT);
1.5185 + PR_STATIC_ASSERT(NS_CORNER_TOP_RIGHT_Y/2 == NS_CORNER_TOP_RIGHT);
1.5186 + PR_STATIC_ASSERT(NS_CORNER_BOTTOM_RIGHT_X/2 == NS_CORNER_BOTTOM_RIGHT);
1.5187 + PR_STATIC_ASSERT(NS_CORNER_BOTTOM_RIGHT_Y/2 == NS_CORNER_BOTTOM_RIGHT);
1.5188 + PR_STATIC_ASSERT(NS_CORNER_BOTTOM_LEFT_X/2 == NS_CORNER_BOTTOM_LEFT);
1.5189 + PR_STATIC_ASSERT(NS_CORNER_BOTTOM_LEFT_Y/2 == NS_CORNER_BOTTOM_LEFT);
1.5190 +
1.5191 + NS_FOR_CSS_HALF_CORNERS(corner) {
1.5192 + // corner is a "half corner" value, so dividing by two gives us a
1.5193 + // "full corner" value.
1.5194 + if (NonZeroStyleCoord(aCorners.Get(corner)) &&
1.5195 + IsCornerAdjacentToSide(corner/2, aSide))
1.5196 + return true;
1.5197 + }
1.5198 + return false;
1.5199 +}
1.5200 +
1.5201 +/* static */ nsTransparencyMode
1.5202 +nsLayoutUtils::GetFrameTransparency(nsIFrame* aBackgroundFrame,
1.5203 + nsIFrame* aCSSRootFrame) {
1.5204 + if (aCSSRootFrame->StyleDisplay()->mOpacity < 1.0f)
1.5205 + return eTransparencyTransparent;
1.5206 +
1.5207 + if (HasNonZeroCorner(aCSSRootFrame->StyleBorder()->mBorderRadius))
1.5208 + return eTransparencyTransparent;
1.5209 +
1.5210 + if (aCSSRootFrame->StyleDisplay()->mAppearance == NS_THEME_WIN_GLASS)
1.5211 + return eTransparencyGlass;
1.5212 +
1.5213 + if (aCSSRootFrame->StyleDisplay()->mAppearance == NS_THEME_WIN_BORDERLESS_GLASS)
1.5214 + return eTransparencyBorderlessGlass;
1.5215 +
1.5216 + nsITheme::Transparency transparency;
1.5217 + if (aCSSRootFrame->IsThemed(&transparency))
1.5218 + return transparency == nsITheme::eTransparent
1.5219 + ? eTransparencyTransparent
1.5220 + : eTransparencyOpaque;
1.5221 +
1.5222 + // We need an uninitialized window to be treated as opaque because
1.5223 + // doing otherwise breaks window display effects on some platforms,
1.5224 + // specifically Vista. (bug 450322)
1.5225 + if (aBackgroundFrame->GetType() == nsGkAtoms::viewportFrame &&
1.5226 + !aBackgroundFrame->GetFirstPrincipalChild()) {
1.5227 + return eTransparencyOpaque;
1.5228 + }
1.5229 +
1.5230 + nsStyleContext* bgSC;
1.5231 + if (!nsCSSRendering::FindBackground(aBackgroundFrame, &bgSC)) {
1.5232 + return eTransparencyTransparent;
1.5233 + }
1.5234 + const nsStyleBackground* bg = bgSC->StyleBackground();
1.5235 + if (NS_GET_A(bg->mBackgroundColor) < 255 ||
1.5236 + // bottom layer's clip is used for the color
1.5237 + bg->BottomLayer().mClip != NS_STYLE_BG_CLIP_BORDER)
1.5238 + return eTransparencyTransparent;
1.5239 + return eTransparencyOpaque;
1.5240 +}
1.5241 +
1.5242 +static bool IsPopupFrame(nsIFrame* aFrame)
1.5243 +{
1.5244 + // aFrame is a popup it's the list control frame dropdown for a combobox.
1.5245 + nsIAtom* frameType = aFrame->GetType();
1.5246 + if (frameType == nsGkAtoms::listControlFrame) {
1.5247 + nsListControlFrame* lcf = static_cast<nsListControlFrame*>(aFrame);
1.5248 + return lcf->IsInDropDownMode();
1.5249 + }
1.5250 +
1.5251 + // ... or if it's a XUL menupopup frame.
1.5252 + return frameType == nsGkAtoms::menuPopupFrame;
1.5253 +}
1.5254 +
1.5255 +/* static */ bool
1.5256 +nsLayoutUtils::IsPopup(nsIFrame* aFrame)
1.5257 +{
1.5258 + // Optimization: the frame can't possibly be a popup if it has no view.
1.5259 + if (!aFrame->HasView()) {
1.5260 + NS_ASSERTION(!IsPopupFrame(aFrame), "popup frame must have a view");
1.5261 + return false;
1.5262 + }
1.5263 + return IsPopupFrame(aFrame);
1.5264 +}
1.5265 +
1.5266 +/* static */ nsIFrame*
1.5267 +nsLayoutUtils::GetDisplayRootFrame(nsIFrame* aFrame)
1.5268 +{
1.5269 + // We could use GetRootPresContext() here if the
1.5270 + // NS_FRAME_IN_POPUP frame bit is set.
1.5271 + nsIFrame* f = aFrame;
1.5272 + for (;;) {
1.5273 + if (!f->HasAnyStateBits(NS_FRAME_IN_POPUP)) {
1.5274 + f = f->PresContext()->FrameManager()->GetRootFrame();
1.5275 + } else if (IsPopup(f)) {
1.5276 + return f;
1.5277 + }
1.5278 + nsIFrame* parent = GetCrossDocParentFrame(f);
1.5279 + if (!parent)
1.5280 + return f;
1.5281 + f = parent;
1.5282 + }
1.5283 +}
1.5284 +
1.5285 +/* static */ nsIFrame*
1.5286 +nsLayoutUtils::GetReferenceFrame(nsIFrame* aFrame)
1.5287 +{
1.5288 + nsIFrame *f = aFrame;
1.5289 + for (;;) {
1.5290 + if (f->IsTransformed() || IsPopup(f)) {
1.5291 + return f;
1.5292 + }
1.5293 + nsIFrame* parent = GetCrossDocParentFrame(f);
1.5294 + if (!parent) {
1.5295 + return f;
1.5296 + }
1.5297 + f = parent;
1.5298 + }
1.5299 +}
1.5300 +
1.5301 +/* static */ nsIFrame*
1.5302 +nsLayoutUtils::GetTransformRootFrame(nsIFrame* aFrame)
1.5303 +{
1.5304 + nsIFrame *parent = nsLayoutUtils::GetCrossDocParentFrame(aFrame);
1.5305 + while (parent && parent->Preserves3DChildren()) {
1.5306 + parent = nsLayoutUtils::GetCrossDocParentFrame(parent);
1.5307 + }
1.5308 + return parent;
1.5309 +}
1.5310 +
1.5311 +/* static */ uint32_t
1.5312 +nsLayoutUtils::GetTextRunFlagsForStyle(nsStyleContext* aStyleContext,
1.5313 + const nsStyleFont* aStyleFont,
1.5314 + const nsStyleText* aStyleText,
1.5315 + nscoord aLetterSpacing)
1.5316 +{
1.5317 + uint32_t result = 0;
1.5318 + if (aLetterSpacing != 0) {
1.5319 + result |= gfxTextRunFactory::TEXT_DISABLE_OPTIONAL_LIGATURES;
1.5320 + }
1.5321 + if (aStyleText->mControlCharacterVisibility == NS_STYLE_CONTROL_CHARACTER_VISIBILITY_HIDDEN) {
1.5322 + result |= gfxTextRunFactory::TEXT_HIDE_CONTROL_CHARACTERS;
1.5323 + }
1.5324 + switch (aStyleContext->StyleSVG()->mTextRendering) {
1.5325 + case NS_STYLE_TEXT_RENDERING_OPTIMIZESPEED:
1.5326 + result |= gfxTextRunFactory::TEXT_OPTIMIZE_SPEED;
1.5327 + break;
1.5328 + case NS_STYLE_TEXT_RENDERING_AUTO:
1.5329 + if (aStyleFont->mFont.size <
1.5330 + aStyleContext->PresContext()->GetAutoQualityMinFontSize()) {
1.5331 + result |= gfxTextRunFactory::TEXT_OPTIMIZE_SPEED;
1.5332 + }
1.5333 + break;
1.5334 + default:
1.5335 + break;
1.5336 + }
1.5337 + return result;
1.5338 +}
1.5339 +
1.5340 +/* static */ void
1.5341 +nsLayoutUtils::GetRectDifferenceStrips(const nsRect& aR1, const nsRect& aR2,
1.5342 + nsRect* aHStrip, nsRect* aVStrip) {
1.5343 + NS_ASSERTION(aR1.TopLeft() == aR2.TopLeft(),
1.5344 + "expected rects at the same position");
1.5345 + nsRect unionRect(aR1.x, aR1.y, std::max(aR1.width, aR2.width),
1.5346 + std::max(aR1.height, aR2.height));
1.5347 + nscoord VStripStart = std::min(aR1.width, aR2.width);
1.5348 + nscoord HStripStart = std::min(aR1.height, aR2.height);
1.5349 + *aVStrip = unionRect;
1.5350 + aVStrip->x += VStripStart;
1.5351 + aVStrip->width -= VStripStart;
1.5352 + *aHStrip = unionRect;
1.5353 + aHStrip->y += HStripStart;
1.5354 + aHStrip->height -= HStripStart;
1.5355 +}
1.5356 +
1.5357 +nsDeviceContext*
1.5358 +nsLayoutUtils::GetDeviceContextForScreenInfo(nsPIDOMWindow* aWindow)
1.5359 +{
1.5360 + if (!aWindow) {
1.5361 + return nullptr;
1.5362 + }
1.5363 +
1.5364 + nsCOMPtr<nsIDocShell> docShell = aWindow->GetDocShell();
1.5365 + while (docShell) {
1.5366 + // Now make sure our size is up to date. That will mean that the device
1.5367 + // context does the right thing on multi-monitor systems when we return it to
1.5368 + // the caller. It will also make sure that our prescontext has been created,
1.5369 + // if we're supposed to have one.
1.5370 + nsCOMPtr<nsPIDOMWindow> win = do_GetInterface(docShell);
1.5371 + if (!win) {
1.5372 + // No reason to go on
1.5373 + return nullptr;
1.5374 + }
1.5375 +
1.5376 + win->EnsureSizeUpToDate();
1.5377 +
1.5378 + nsRefPtr<nsPresContext> presContext;
1.5379 + docShell->GetPresContext(getter_AddRefs(presContext));
1.5380 + if (presContext) {
1.5381 + nsDeviceContext* context = presContext->DeviceContext();
1.5382 + if (context) {
1.5383 + return context;
1.5384 + }
1.5385 + }
1.5386 +
1.5387 + nsCOMPtr<nsIDocShellTreeItem> parentItem;
1.5388 + docShell->GetParent(getter_AddRefs(parentItem));
1.5389 + docShell = do_QueryInterface(parentItem);
1.5390 + }
1.5391 +
1.5392 + return nullptr;
1.5393 +}
1.5394 +
1.5395 +/* static */ bool
1.5396 +nsLayoutUtils::IsReallyFixedPos(nsIFrame* aFrame)
1.5397 +{
1.5398 + NS_PRECONDITION(aFrame->GetParent(),
1.5399 + "IsReallyFixedPos called on frame not in tree");
1.5400 + NS_PRECONDITION(aFrame->StyleDisplay()->mPosition ==
1.5401 + NS_STYLE_POSITION_FIXED,
1.5402 + "IsReallyFixedPos called on non-'position:fixed' frame");
1.5403 +
1.5404 + nsIAtom *parentType = aFrame->GetParent()->GetType();
1.5405 + return parentType == nsGkAtoms::viewportFrame ||
1.5406 + parentType == nsGkAtoms::pageContentFrame;
1.5407 +}
1.5408 +
1.5409 +nsLayoutUtils::SurfaceFromElementResult
1.5410 +nsLayoutUtils::SurfaceFromElement(nsIImageLoadingContent* aElement,
1.5411 + uint32_t aSurfaceFlags,
1.5412 + DrawTarget* aTarget)
1.5413 +{
1.5414 + SurfaceFromElementResult result;
1.5415 + nsresult rv;
1.5416 +
1.5417 + nsCOMPtr<imgIRequest> imgRequest;
1.5418 + rv = aElement->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
1.5419 + getter_AddRefs(imgRequest));
1.5420 + if (NS_FAILED(rv) || !imgRequest)
1.5421 + return result;
1.5422 +
1.5423 + uint32_t status;
1.5424 + imgRequest->GetImageStatus(&status);
1.5425 + if ((status & imgIRequest::STATUS_LOAD_COMPLETE) == 0) {
1.5426 + // Spec says to use GetComplete, but that only works on
1.5427 + // nsIDOMHTMLImageElement, and we support all sorts of other stuff
1.5428 + // here. Do this for now pending spec clarification.
1.5429 + result.mIsStillLoading = (status & imgIRequest::STATUS_ERROR) == 0;
1.5430 + return result;
1.5431 + }
1.5432 +
1.5433 + nsCOMPtr<nsIPrincipal> principal;
1.5434 + rv = imgRequest->GetImagePrincipal(getter_AddRefs(principal));
1.5435 + if (NS_FAILED(rv))
1.5436 + return result;
1.5437 +
1.5438 + nsCOMPtr<imgIContainer> imgContainer;
1.5439 + rv = imgRequest->GetImage(getter_AddRefs(imgContainer));
1.5440 + if (NS_FAILED(rv))
1.5441 + return result;
1.5442 +
1.5443 + uint32_t noRasterize = aSurfaceFlags & SFE_NO_RASTERIZING_VECTORS;
1.5444 +
1.5445 + uint32_t whichFrame = (aSurfaceFlags & SFE_WANT_FIRST_FRAME)
1.5446 + ? (uint32_t) imgIContainer::FRAME_FIRST
1.5447 + : (uint32_t) imgIContainer::FRAME_CURRENT;
1.5448 + uint32_t frameFlags = imgIContainer::FLAG_SYNC_DECODE;
1.5449 + if (aSurfaceFlags & SFE_NO_COLORSPACE_CONVERSION)
1.5450 + frameFlags |= imgIContainer::FLAG_DECODE_NO_COLORSPACE_CONVERSION;
1.5451 + if (aSurfaceFlags & SFE_PREFER_NO_PREMULTIPLY_ALPHA) {
1.5452 + frameFlags |= imgIContainer::FLAG_DECODE_NO_PREMULTIPLY_ALPHA;
1.5453 + result.mIsPremultiplied = false;
1.5454 + }
1.5455 +
1.5456 + int32_t imgWidth, imgHeight;
1.5457 + rv = imgContainer->GetWidth(&imgWidth);
1.5458 + nsresult rv2 = imgContainer->GetHeight(&imgHeight);
1.5459 + if (NS_FAILED(rv) || NS_FAILED(rv2))
1.5460 + return result;
1.5461 +
1.5462 + if (!noRasterize || imgContainer->GetType() == imgIContainer::TYPE_RASTER) {
1.5463 + if (aSurfaceFlags & SFE_WANT_IMAGE_SURFACE) {
1.5464 + frameFlags |= imgIContainer::FLAG_WANT_DATA_SURFACE;
1.5465 + }
1.5466 + result.mSourceSurface = imgContainer->GetFrame(whichFrame, frameFlags);
1.5467 + if (!result.mSourceSurface) {
1.5468 + return result;
1.5469 + }
1.5470 + // The surface we return is likely to be cached. We don't want to have to
1.5471 + // convert to a surface that's compatible with aTarget each time it's used
1.5472 + // (that would result in terrible performance), so we convert once here
1.5473 + // upfront if aTarget is specified.
1.5474 + if (aTarget) {
1.5475 + RefPtr<SourceSurface> optSurface =
1.5476 + aTarget->OptimizeSourceSurface(result.mSourceSurface);
1.5477 + if (optSurface) {
1.5478 + result.mSourceSurface = optSurface;
1.5479 + }
1.5480 + }
1.5481 + } else {
1.5482 + result.mDrawInfo.mImgContainer = imgContainer;
1.5483 + result.mDrawInfo.mWhichFrame = whichFrame;
1.5484 + result.mDrawInfo.mDrawingFlags = frameFlags;
1.5485 + }
1.5486 +
1.5487 + int32_t corsmode;
1.5488 + if (NS_SUCCEEDED(imgRequest->GetCORSMode(&corsmode))) {
1.5489 + result.mCORSUsed = (corsmode != imgIRequest::CORS_NONE);
1.5490 + }
1.5491 +
1.5492 + result.mSize = gfxIntSize(imgWidth, imgHeight);
1.5493 + result.mPrincipal = principal.forget();
1.5494 + // no images, including SVG images, can load content from another domain.
1.5495 + result.mIsWriteOnly = false;
1.5496 + result.mImageRequest = imgRequest.forget();
1.5497 +
1.5498 + return result;
1.5499 +}
1.5500 +
1.5501 +nsLayoutUtils::SurfaceFromElementResult
1.5502 +nsLayoutUtils::SurfaceFromElement(HTMLImageElement *aElement,
1.5503 + uint32_t aSurfaceFlags,
1.5504 + DrawTarget* aTarget)
1.5505 +{
1.5506 + return SurfaceFromElement(static_cast<nsIImageLoadingContent*>(aElement),
1.5507 + aSurfaceFlags, aTarget);
1.5508 +}
1.5509 +
1.5510 +nsLayoutUtils::SurfaceFromElementResult
1.5511 +nsLayoutUtils::SurfaceFromElement(HTMLCanvasElement* aElement,
1.5512 + uint32_t aSurfaceFlags,
1.5513 + DrawTarget* aTarget)
1.5514 +{
1.5515 + SurfaceFromElementResult result;
1.5516 +
1.5517 + bool* isPremultiplied = nullptr;
1.5518 + if (aSurfaceFlags & SFE_PREFER_NO_PREMULTIPLY_ALPHA) {
1.5519 + isPremultiplied = &result.mIsPremultiplied;
1.5520 + }
1.5521 +
1.5522 + gfxIntSize size = aElement->GetSize();
1.5523 +
1.5524 + result.mSourceSurface = aElement->GetSurfaceSnapshot(isPremultiplied);
1.5525 + if (!result.mSourceSurface) {
1.5526 + // If the element doesn't have a context then we won't get a snapshot. The canvas spec wants us to not error and just
1.5527 + // draw nothing, so return an empty surface.
1.5528 + DrawTarget *ref = aTarget ? aTarget : gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget();
1.5529 + RefPtr<DrawTarget> dt = ref->CreateSimilarDrawTarget(IntSize(size.width, size.height),
1.5530 + SurfaceFormat::B8G8R8A8);
1.5531 + if (dt) {
1.5532 + result.mSourceSurface = dt->Snapshot();
1.5533 + }
1.5534 + } else if (aTarget) {
1.5535 + RefPtr<SourceSurface> opt = aTarget->OptimizeSourceSurface(result.mSourceSurface);
1.5536 + if (opt) {
1.5537 + result.mSourceSurface = opt;
1.5538 + }
1.5539 + }
1.5540 +
1.5541 + // Ensure that any future changes to the canvas trigger proper invalidation,
1.5542 + // in case this is being used by -moz-element()
1.5543 + aElement->MarkContextClean();
1.5544 +
1.5545 + result.mSize = size;
1.5546 + result.mPrincipal = aElement->NodePrincipal();
1.5547 + result.mIsWriteOnly = aElement->IsWriteOnly();
1.5548 +
1.5549 + return result;
1.5550 +}
1.5551 +
1.5552 +nsLayoutUtils::SurfaceFromElementResult
1.5553 +nsLayoutUtils::SurfaceFromElement(HTMLVideoElement* aElement,
1.5554 + uint32_t aSurfaceFlags,
1.5555 + DrawTarget* aTarget)
1.5556 +{
1.5557 + SurfaceFromElementResult result;
1.5558 +
1.5559 + NS_WARN_IF_FALSE((aSurfaceFlags & SFE_PREFER_NO_PREMULTIPLY_ALPHA) == 0, "We can't support non-premultiplied alpha for video!");
1.5560 +
1.5561 + uint16_t readyState;
1.5562 + if (NS_SUCCEEDED(aElement->GetReadyState(&readyState)) &&
1.5563 + (readyState == nsIDOMHTMLMediaElement::HAVE_NOTHING ||
1.5564 + readyState == nsIDOMHTMLMediaElement::HAVE_METADATA)) {
1.5565 + result.mIsStillLoading = true;
1.5566 + return result;
1.5567 + }
1.5568 +
1.5569 + // If it doesn't have a principal, just bail
1.5570 + nsCOMPtr<nsIPrincipal> principal = aElement->GetCurrentPrincipal();
1.5571 + if (!principal)
1.5572 + return result;
1.5573 +
1.5574 + ImageContainer *container = aElement->GetImageContainer();
1.5575 + if (!container)
1.5576 + return result;
1.5577 +
1.5578 + mozilla::gfx::IntSize size;
1.5579 + result.mSourceSurface = container->GetCurrentAsSourceSurface(&size);
1.5580 + if (!result.mSourceSurface)
1.5581 + return result;
1.5582 +
1.5583 + if (aTarget) {
1.5584 + RefPtr<SourceSurface> opt = aTarget->OptimizeSourceSurface(result.mSourceSurface);
1.5585 + if (opt) {
1.5586 + result.mSourceSurface = opt;
1.5587 + }
1.5588 + }
1.5589 +
1.5590 + result.mCORSUsed = aElement->GetCORSMode() != CORS_NONE;
1.5591 + result.mSize = ThebesIntSize(size);
1.5592 + result.mPrincipal = principal.forget();
1.5593 + result.mIsWriteOnly = false;
1.5594 +
1.5595 + return result;
1.5596 +}
1.5597 +
1.5598 +nsLayoutUtils::SurfaceFromElementResult
1.5599 +nsLayoutUtils::SurfaceFromElement(dom::Element* aElement,
1.5600 + uint32_t aSurfaceFlags,
1.5601 + DrawTarget* aTarget)
1.5602 +{
1.5603 + // If it's a <canvas>, we may be able to just grab its internal surface
1.5604 + if (HTMLCanvasElement* canvas =
1.5605 + HTMLCanvasElement::FromContentOrNull(aElement)) {
1.5606 + return SurfaceFromElement(canvas, aSurfaceFlags, aTarget);
1.5607 + }
1.5608 +
1.5609 + // Maybe it's <video>?
1.5610 + if (HTMLVideoElement* video =
1.5611 + HTMLVideoElement::FromContentOrNull(aElement)) {
1.5612 + return SurfaceFromElement(video, aSurfaceFlags, aTarget);
1.5613 + }
1.5614 +
1.5615 + // Finally, check if it's a normal image
1.5616 + nsCOMPtr<nsIImageLoadingContent> imageLoader = do_QueryInterface(aElement);
1.5617 +
1.5618 + if (!imageLoader) {
1.5619 + return SurfaceFromElementResult();
1.5620 + }
1.5621 +
1.5622 + return SurfaceFromElement(imageLoader, aSurfaceFlags, aTarget);
1.5623 +}
1.5624 +
1.5625 +/* static */
1.5626 +nsIContent*
1.5627 +nsLayoutUtils::GetEditableRootContentByContentEditable(nsIDocument* aDocument)
1.5628 +{
1.5629 + // If the document is in designMode we should return nullptr.
1.5630 + if (!aDocument || aDocument->HasFlag(NODE_IS_EDITABLE)) {
1.5631 + return nullptr;
1.5632 + }
1.5633 +
1.5634 + // contenteditable only works with HTML document.
1.5635 + // Note: Use nsIDOMHTMLDocument rather than nsIHTMLDocument for getting the
1.5636 + // body node because nsIDOMHTMLDocument::GetBody() does something
1.5637 + // additional work for some cases and nsEditor uses them.
1.5638 + nsCOMPtr<nsIDOMHTMLDocument> domHTMLDoc = do_QueryInterface(aDocument);
1.5639 + if (!domHTMLDoc) {
1.5640 + return nullptr;
1.5641 + }
1.5642 +
1.5643 + Element* rootElement = aDocument->GetRootElement();
1.5644 + if (rootElement && rootElement->IsEditable()) {
1.5645 + return rootElement;
1.5646 + }
1.5647 +
1.5648 + // If there are no editable root element, check its <body> element.
1.5649 + // Note that the body element could be <frameset> element.
1.5650 + nsCOMPtr<nsIDOMHTMLElement> body;
1.5651 + nsresult rv = domHTMLDoc->GetBody(getter_AddRefs(body));
1.5652 + nsCOMPtr<nsIContent> content = do_QueryInterface(body);
1.5653 + if (NS_SUCCEEDED(rv) && content && content->IsEditable()) {
1.5654 + return content;
1.5655 + }
1.5656 + return nullptr;
1.5657 +}
1.5658 +
1.5659 +#ifdef DEBUG
1.5660 +/* static */ void
1.5661 +nsLayoutUtils::AssertNoDuplicateContinuations(nsIFrame* aContainer,
1.5662 + const nsFrameList& aFrameList)
1.5663 +{
1.5664 + for (nsIFrame* f = aFrameList.FirstChild(); f ; f = f->GetNextSibling()) {
1.5665 + // Check only later continuations of f; we deal with checking the
1.5666 + // earlier continuations when we hit those earlier continuations in
1.5667 + // the frame list.
1.5668 + for (nsIFrame *c = f; (c = c->GetNextInFlow());) {
1.5669 + NS_ASSERTION(c->GetParent() != aContainer ||
1.5670 + !aFrameList.ContainsFrame(c),
1.5671 + "Two continuations of the same frame in the same "
1.5672 + "frame list");
1.5673 + }
1.5674 + }
1.5675 +}
1.5676 +
1.5677 +// Is one of aFrame's ancestors a letter frame?
1.5678 +static bool
1.5679 +IsInLetterFrame(nsIFrame *aFrame)
1.5680 +{
1.5681 + for (nsIFrame *f = aFrame->GetParent(); f; f = f->GetParent()) {
1.5682 + if (f->GetType() == nsGkAtoms::letterFrame) {
1.5683 + return true;
1.5684 + }
1.5685 + }
1.5686 + return false;
1.5687 +}
1.5688 +
1.5689 +/* static */ void
1.5690 +nsLayoutUtils::AssertTreeOnlyEmptyNextInFlows(nsIFrame *aSubtreeRoot)
1.5691 +{
1.5692 + NS_ASSERTION(aSubtreeRoot->GetPrevInFlow(),
1.5693 + "frame tree not empty, but caller reported complete status");
1.5694 +
1.5695 + // Also assert that text frames map no text.
1.5696 + int32_t start, end;
1.5697 + nsresult rv = aSubtreeRoot->GetOffsets(start, end);
1.5698 + NS_ASSERTION(NS_SUCCEEDED(rv), "GetOffsets failed");
1.5699 + // In some cases involving :first-letter, we'll partially unlink a
1.5700 + // continuation in the middle of a continuation chain from its
1.5701 + // previous and next continuations before destroying it, presumably so
1.5702 + // that we don't also destroy the later continuations. Once we've
1.5703 + // done this, GetOffsets returns incorrect values.
1.5704 + // For examples, see list of tests in
1.5705 + // https://bugzilla.mozilla.org/show_bug.cgi?id=619021#c29
1.5706 + NS_ASSERTION(start == end || IsInLetterFrame(aSubtreeRoot),
1.5707 + "frame tree not empty, but caller reported complete status");
1.5708 +
1.5709 + nsIFrame::ChildListIterator lists(aSubtreeRoot);
1.5710 + for (; !lists.IsDone(); lists.Next()) {
1.5711 + nsFrameList::Enumerator childFrames(lists.CurrentList());
1.5712 + for (; !childFrames.AtEnd(); childFrames.Next()) {
1.5713 + nsLayoutUtils::AssertTreeOnlyEmptyNextInFlows(childFrames.get());
1.5714 + }
1.5715 + }
1.5716 +}
1.5717 +#endif
1.5718 +
1.5719 +static void
1.5720 +GetFontFacesForFramesInner(nsIFrame* aFrame, nsFontFaceList* aFontFaceList)
1.5721 +{
1.5722 + NS_PRECONDITION(aFrame, "NULL frame pointer");
1.5723 +
1.5724 + if (aFrame->GetType() == nsGkAtoms::textFrame) {
1.5725 + if (!aFrame->GetPrevContinuation()) {
1.5726 + nsLayoutUtils::GetFontFacesForText(aFrame, 0, INT32_MAX, true,
1.5727 + aFontFaceList);
1.5728 + }
1.5729 + return;
1.5730 + }
1.5731 +
1.5732 + nsIFrame::ChildListID childLists[] = { nsIFrame::kPrincipalList,
1.5733 + nsIFrame::kPopupList };
1.5734 + for (size_t i = 0; i < ArrayLength(childLists); ++i) {
1.5735 + nsFrameList children(aFrame->GetChildList(childLists[i]));
1.5736 + for (nsFrameList::Enumerator e(children); !e.AtEnd(); e.Next()) {
1.5737 + nsIFrame* child = e.get();
1.5738 + child = nsPlaceholderFrame::GetRealFrameFor(child);
1.5739 + GetFontFacesForFramesInner(child, aFontFaceList);
1.5740 + }
1.5741 + }
1.5742 +}
1.5743 +
1.5744 +/* static */
1.5745 +nsresult
1.5746 +nsLayoutUtils::GetFontFacesForFrames(nsIFrame* aFrame,
1.5747 + nsFontFaceList* aFontFaceList)
1.5748 +{
1.5749 + NS_PRECONDITION(aFrame, "NULL frame pointer");
1.5750 +
1.5751 + while (aFrame) {
1.5752 + GetFontFacesForFramesInner(aFrame, aFontFaceList);
1.5753 + aFrame = GetNextContinuationOrIBSplitSibling(aFrame);
1.5754 + }
1.5755 +
1.5756 + return NS_OK;
1.5757 +}
1.5758 +
1.5759 +/* static */
1.5760 +nsresult
1.5761 +nsLayoutUtils::GetFontFacesForText(nsIFrame* aFrame,
1.5762 + int32_t aStartOffset, int32_t aEndOffset,
1.5763 + bool aFollowContinuations,
1.5764 + nsFontFaceList* aFontFaceList)
1.5765 +{
1.5766 + NS_PRECONDITION(aFrame, "NULL frame pointer");
1.5767 +
1.5768 + if (aFrame->GetType() != nsGkAtoms::textFrame) {
1.5769 + return NS_OK;
1.5770 + }
1.5771 +
1.5772 + nsTextFrame* curr = static_cast<nsTextFrame*>(aFrame);
1.5773 + do {
1.5774 + int32_t fstart = std::max(curr->GetContentOffset(), aStartOffset);
1.5775 + int32_t fend = std::min(curr->GetContentEnd(), aEndOffset);
1.5776 + if (fstart >= fend) {
1.5777 + curr = static_cast<nsTextFrame*>(curr->GetNextContinuation());
1.5778 + continue;
1.5779 + }
1.5780 +
1.5781 + // curr is overlapping with the offset we want
1.5782 + gfxSkipCharsIterator iter = curr->EnsureTextRun(nsTextFrame::eInflated);
1.5783 + gfxTextRun* textRun = curr->GetTextRun(nsTextFrame::eInflated);
1.5784 + NS_ENSURE_TRUE(textRun, NS_ERROR_OUT_OF_MEMORY);
1.5785 +
1.5786 + // include continuations in the range that share the same textrun
1.5787 + nsTextFrame* next = nullptr;
1.5788 + if (aFollowContinuations && fend < aEndOffset) {
1.5789 + next = static_cast<nsTextFrame*>(curr->GetNextContinuation());
1.5790 + while (next && next->GetTextRun(nsTextFrame::eInflated) == textRun) {
1.5791 + fend = std::min(next->GetContentEnd(), aEndOffset);
1.5792 + next = fend < aEndOffset ?
1.5793 + static_cast<nsTextFrame*>(next->GetNextContinuation()) : nullptr;
1.5794 + }
1.5795 + }
1.5796 +
1.5797 + uint32_t skipStart = iter.ConvertOriginalToSkipped(fstart);
1.5798 + uint32_t skipEnd = iter.ConvertOriginalToSkipped(fend);
1.5799 + aFontFaceList->AddFontsFromTextRun(textRun, skipStart, skipEnd - skipStart);
1.5800 + curr = next;
1.5801 + } while (aFollowContinuations && curr);
1.5802 +
1.5803 + return NS_OK;
1.5804 +}
1.5805 +
1.5806 +/* static */
1.5807 +size_t
1.5808 +nsLayoutUtils::SizeOfTextRunsForFrames(nsIFrame* aFrame,
1.5809 + MallocSizeOf aMallocSizeOf,
1.5810 + bool clear)
1.5811 +{
1.5812 + NS_PRECONDITION(aFrame, "NULL frame pointer");
1.5813 +
1.5814 + size_t total = 0;
1.5815 +
1.5816 + if (aFrame->GetType() == nsGkAtoms::textFrame) {
1.5817 + nsTextFrame* textFrame = static_cast<nsTextFrame*>(aFrame);
1.5818 + for (uint32_t i = 0; i < 2; ++i) {
1.5819 + gfxTextRun *run = textFrame->GetTextRun(
1.5820 + (i != 0) ? nsTextFrame::eInflated : nsTextFrame::eNotInflated);
1.5821 + if (run) {
1.5822 + if (clear) {
1.5823 + run->ResetSizeOfAccountingFlags();
1.5824 + } else {
1.5825 + total += run->MaybeSizeOfIncludingThis(aMallocSizeOf);
1.5826 + }
1.5827 + }
1.5828 + }
1.5829 + return total;
1.5830 + }
1.5831 +
1.5832 + nsAutoTArray<nsIFrame::ChildList,4> childListArray;
1.5833 + aFrame->GetChildLists(&childListArray);
1.5834 +
1.5835 + for (nsIFrame::ChildListArrayIterator childLists(childListArray);
1.5836 + !childLists.IsDone(); childLists.Next()) {
1.5837 + for (nsFrameList::Enumerator e(childLists.CurrentList());
1.5838 + !e.AtEnd(); e.Next()) {
1.5839 + total += SizeOfTextRunsForFrames(e.get(), aMallocSizeOf, clear);
1.5840 + }
1.5841 + }
1.5842 + return total;
1.5843 +}
1.5844 +
1.5845 +/* static */
1.5846 +void
1.5847 +nsLayoutUtils::Initialize()
1.5848 +{
1.5849 + Preferences::AddUintVarCache(&sFontSizeInflationMaxRatio,
1.5850 + "font.size.inflation.maxRatio");
1.5851 + Preferences::AddUintVarCache(&sFontSizeInflationEmPerLine,
1.5852 + "font.size.inflation.emPerLine");
1.5853 + Preferences::AddUintVarCache(&sFontSizeInflationMinTwips,
1.5854 + "font.size.inflation.minTwips");
1.5855 + Preferences::AddUintVarCache(&sFontSizeInflationLineThreshold,
1.5856 + "font.size.inflation.lineThreshold");
1.5857 + Preferences::AddIntVarCache(&sFontSizeInflationMappingIntercept,
1.5858 + "font.size.inflation.mappingIntercept");
1.5859 + Preferences::AddBoolVarCache(&sFontSizeInflationForceEnabled,
1.5860 + "font.size.inflation.forceEnabled");
1.5861 + Preferences::AddBoolVarCache(&sFontSizeInflationDisabledInMasterProcess,
1.5862 + "font.size.inflation.disabledInMasterProcess");
1.5863 + Preferences::AddBoolVarCache(&sInvalidationDebuggingIsEnabled,
1.5864 + "nglayout.debug.invalidation");
1.5865 + Preferences::AddBoolVarCache(&sCSSVariablesEnabled,
1.5866 + "layout.css.variables.enabled");
1.5867 + Preferences::AddBoolVarCache(&sInterruptibleReflowEnabled,
1.5868 + "layout.interruptible-reflow.enabled");
1.5869 +
1.5870 + Preferences::RegisterCallback(GridEnabledPrefChangeCallback,
1.5871 + GRID_ENABLED_PREF_NAME);
1.5872 + GridEnabledPrefChangeCallback(GRID_ENABLED_PREF_NAME, nullptr);
1.5873 + Preferences::RegisterCallback(StickyEnabledPrefChangeCallback,
1.5874 + STICKY_ENABLED_PREF_NAME);
1.5875 + StickyEnabledPrefChangeCallback(STICKY_ENABLED_PREF_NAME, nullptr);
1.5876 + Preferences::RegisterCallback(TextAlignTrueEnabledPrefChangeCallback,
1.5877 + TEXT_ALIGN_TRUE_ENABLED_PREF_NAME);
1.5878 + TextAlignTrueEnabledPrefChangeCallback(TEXT_ALIGN_TRUE_ENABLED_PREF_NAME,
1.5879 + nullptr);
1.5880 +
1.5881 + nsComputedDOMStyle::RegisterPrefChangeCallbacks();
1.5882 +}
1.5883 +
1.5884 +/* static */
1.5885 +void
1.5886 +nsLayoutUtils::Shutdown()
1.5887 +{
1.5888 + if (sContentMap) {
1.5889 + delete sContentMap;
1.5890 + sContentMap = nullptr;
1.5891 + }
1.5892 +
1.5893 + Preferences::UnregisterCallback(GridEnabledPrefChangeCallback,
1.5894 + GRID_ENABLED_PREF_NAME);
1.5895 + Preferences::UnregisterCallback(StickyEnabledPrefChangeCallback,
1.5896 + STICKY_ENABLED_PREF_NAME);
1.5897 +
1.5898 + nsComputedDOMStyle::UnregisterPrefChangeCallbacks();
1.5899 +}
1.5900 +
1.5901 +/* static */
1.5902 +void
1.5903 +nsLayoutUtils::RegisterImageRequest(nsPresContext* aPresContext,
1.5904 + imgIRequest* aRequest,
1.5905 + bool* aRequestRegistered)
1.5906 +{
1.5907 + if (!aPresContext) {
1.5908 + return;
1.5909 + }
1.5910 +
1.5911 + if (aRequestRegistered && *aRequestRegistered) {
1.5912 + // Our request is already registered with the refresh driver, so
1.5913 + // no need to register it again.
1.5914 + return;
1.5915 + }
1.5916 +
1.5917 + if (aRequest) {
1.5918 + if (!aPresContext->RefreshDriver()->AddImageRequest(aRequest)) {
1.5919 + NS_WARNING("Unable to add image request");
1.5920 + return;
1.5921 + }
1.5922 +
1.5923 + if (aRequestRegistered) {
1.5924 + *aRequestRegistered = true;
1.5925 + }
1.5926 + }
1.5927 +}
1.5928 +
1.5929 +/* static */
1.5930 +void
1.5931 +nsLayoutUtils::RegisterImageRequestIfAnimated(nsPresContext* aPresContext,
1.5932 + imgIRequest* aRequest,
1.5933 + bool* aRequestRegistered)
1.5934 +{
1.5935 + if (!aPresContext) {
1.5936 + return;
1.5937 + }
1.5938 +
1.5939 + if (aRequestRegistered && *aRequestRegistered) {
1.5940 + // Our request is already registered with the refresh driver, so
1.5941 + // no need to register it again.
1.5942 + return;
1.5943 + }
1.5944 +
1.5945 + if (aRequest) {
1.5946 + nsCOMPtr<imgIContainer> image;
1.5947 + if (NS_SUCCEEDED(aRequest->GetImage(getter_AddRefs(image)))) {
1.5948 + // Check to verify that the image is animated. If so, then add it to the
1.5949 + // list of images tracked by the refresh driver.
1.5950 + bool isAnimated = false;
1.5951 + nsresult rv = image->GetAnimated(&isAnimated);
1.5952 + if (NS_SUCCEEDED(rv) && isAnimated) {
1.5953 + if (!aPresContext->RefreshDriver()->AddImageRequest(aRequest)) {
1.5954 + NS_WARNING("Unable to add image request");
1.5955 + return;
1.5956 + }
1.5957 +
1.5958 + if (aRequestRegistered) {
1.5959 + *aRequestRegistered = true;
1.5960 + }
1.5961 + }
1.5962 + }
1.5963 + }
1.5964 +}
1.5965 +
1.5966 +/* static */
1.5967 +void
1.5968 +nsLayoutUtils::DeregisterImageRequest(nsPresContext* aPresContext,
1.5969 + imgIRequest* aRequest,
1.5970 + bool* aRequestRegistered)
1.5971 +{
1.5972 + if (!aPresContext) {
1.5973 + return;
1.5974 + }
1.5975 +
1.5976 + // Deregister our imgIRequest with the refresh driver to
1.5977 + // complete tear-down, but only if it has been registered
1.5978 + if (aRequestRegistered && !*aRequestRegistered) {
1.5979 + return;
1.5980 + }
1.5981 +
1.5982 + if (aRequest) {
1.5983 + nsCOMPtr<imgIContainer> image;
1.5984 + if (NS_SUCCEEDED(aRequest->GetImage(getter_AddRefs(image)))) {
1.5985 + aPresContext->RefreshDriver()->RemoveImageRequest(aRequest);
1.5986 +
1.5987 + if (aRequestRegistered) {
1.5988 + *aRequestRegistered = false;
1.5989 + }
1.5990 + }
1.5991 + }
1.5992 +}
1.5993 +
1.5994 +/* static */
1.5995 +void
1.5996 +nsLayoutUtils::PostRestyleEvent(Element* aElement,
1.5997 + nsRestyleHint aRestyleHint,
1.5998 + nsChangeHint aMinChangeHint)
1.5999 +{
1.6000 + nsIDocument* doc = aElement->GetCurrentDoc();
1.6001 + if (doc) {
1.6002 + nsCOMPtr<nsIPresShell> presShell = doc->GetShell();
1.6003 + if (presShell) {
1.6004 + presShell->GetPresContext()->RestyleManager()->PostRestyleEvent(
1.6005 + aElement, aRestyleHint, aMinChangeHint);
1.6006 + }
1.6007 + }
1.6008 +}
1.6009 +
1.6010 +nsSetAttrRunnable::nsSetAttrRunnable(nsIContent* aContent, nsIAtom* aAttrName,
1.6011 + const nsAString& aValue)
1.6012 + : mContent(aContent),
1.6013 + mAttrName(aAttrName),
1.6014 + mValue(aValue)
1.6015 +{
1.6016 + NS_ASSERTION(aContent && aAttrName, "Missing stuff, prepare to crash");
1.6017 +}
1.6018 +
1.6019 +nsSetAttrRunnable::nsSetAttrRunnable(nsIContent* aContent, nsIAtom* aAttrName,
1.6020 + int32_t aValue)
1.6021 + : mContent(aContent),
1.6022 + mAttrName(aAttrName)
1.6023 +{
1.6024 + NS_ASSERTION(aContent && aAttrName, "Missing stuff, prepare to crash");
1.6025 + mValue.AppendInt(aValue);
1.6026 +}
1.6027 +
1.6028 +NS_IMETHODIMP
1.6029 +nsSetAttrRunnable::Run()
1.6030 +{
1.6031 + return mContent->SetAttr(kNameSpaceID_None, mAttrName, mValue, true);
1.6032 +}
1.6033 +
1.6034 +nsUnsetAttrRunnable::nsUnsetAttrRunnable(nsIContent* aContent,
1.6035 + nsIAtom* aAttrName)
1.6036 + : mContent(aContent),
1.6037 + mAttrName(aAttrName)
1.6038 +{
1.6039 + NS_ASSERTION(aContent && aAttrName, "Missing stuff, prepare to crash");
1.6040 +}
1.6041 +
1.6042 +NS_IMETHODIMP
1.6043 +nsUnsetAttrRunnable::Run()
1.6044 +{
1.6045 + return mContent->UnsetAttr(kNameSpaceID_None, mAttrName, true);
1.6046 +}
1.6047 +
1.6048 +/**
1.6049 + * Compute the minimum font size inside of a container with the given
1.6050 + * width, such that **when the user zooms the container to fill the full
1.6051 + * width of the device**, the fonts satisfy our minima.
1.6052 + */
1.6053 +static nscoord
1.6054 +MinimumFontSizeFor(nsPresContext* aPresContext, nscoord aContainerWidth)
1.6055 +{
1.6056 + nsIPresShell* presShell = aPresContext->PresShell();
1.6057 +
1.6058 + uint32_t emPerLine = presShell->FontSizeInflationEmPerLine();
1.6059 + uint32_t minTwips = presShell->FontSizeInflationMinTwips();
1.6060 + if (emPerLine == 0 && minTwips == 0) {
1.6061 + return 0;
1.6062 + }
1.6063 +
1.6064 + // Clamp the container width to the device dimensions
1.6065 + nscoord iFrameWidth = aPresContext->GetVisibleArea().width;
1.6066 + nscoord effectiveContainerWidth = std::min(iFrameWidth, aContainerWidth);
1.6067 +
1.6068 + nscoord byLine = 0, byInch = 0;
1.6069 + if (emPerLine != 0) {
1.6070 + byLine = effectiveContainerWidth / emPerLine;
1.6071 + }
1.6072 + if (minTwips != 0) {
1.6073 + // REVIEW: Is this giving us app units and sizes *not* counting
1.6074 + // viewport scaling?
1.6075 + float deviceWidthInches =
1.6076 + aPresContext->ScreenWidthInchesForFontInflation();
1.6077 + byInch = NSToCoordRound(effectiveContainerWidth /
1.6078 + (deviceWidthInches * 1440 /
1.6079 + minTwips ));
1.6080 + }
1.6081 + return std::max(byLine, byInch);
1.6082 +}
1.6083 +
1.6084 +/* static */ float
1.6085 +nsLayoutUtils::FontSizeInflationInner(const nsIFrame *aFrame,
1.6086 + nscoord aMinFontSize)
1.6087 +{
1.6088 + // Note that line heights should be inflated by the same ratio as the
1.6089 + // font size of the same text; thus we operate only on the font size
1.6090 + // even when we're scaling a line height.
1.6091 + nscoord styleFontSize = aFrame->StyleFont()->mFont.size;
1.6092 + if (styleFontSize <= 0) {
1.6093 + // Never scale zero font size.
1.6094 + return 1.0;
1.6095 + }
1.6096 +
1.6097 + if (aMinFontSize <= 0) {
1.6098 + // No need to scale.
1.6099 + return 1.0;
1.6100 + }
1.6101 +
1.6102 + // If between this current frame and its font inflation container there is a
1.6103 + // non-inline element with fixed width or height, then we should not inflate
1.6104 + // fonts for this frame.
1.6105 + for (const nsIFrame* f = aFrame;
1.6106 + f && !f->IsContainerForFontSizeInflation();
1.6107 + f = f->GetParent()) {
1.6108 + nsIContent* content = f->GetContent();
1.6109 + nsIAtom* fType = f->GetType();
1.6110 + // Also, if there is more than one frame corresponding to a single
1.6111 + // content node, we want the outermost one.
1.6112 + if (!(f->GetParent() && f->GetParent()->GetContent() == content) &&
1.6113 + // ignore width/height on inlines since they don't apply
1.6114 + fType != nsGkAtoms::inlineFrame &&
1.6115 + // ignore width on radios and checkboxes since we enlarge them and
1.6116 + // they have width/height in ua.css
1.6117 + fType != nsGkAtoms::formControlFrame) {
1.6118 + nsStyleCoord stylePosWidth = f->StylePosition()->mWidth;
1.6119 + nsStyleCoord stylePosHeight = f->StylePosition()->mHeight;
1.6120 + if (stylePosWidth.GetUnit() != eStyleUnit_Auto ||
1.6121 + stylePosHeight.GetUnit() != eStyleUnit_Auto) {
1.6122 +
1.6123 + return 1.0;
1.6124 + }
1.6125 + }
1.6126 + }
1.6127 +
1.6128 + int32_t interceptParam = nsLayoutUtils::FontSizeInflationMappingIntercept();
1.6129 + float maxRatio = (float)nsLayoutUtils::FontSizeInflationMaxRatio() / 100.0f;
1.6130 +
1.6131 + float ratio = float(styleFontSize) / float(aMinFontSize);
1.6132 + float inflationRatio;
1.6133 +
1.6134 + // Given a minimum inflated font size m, a specified font size s, we want to
1.6135 + // find the inflated font size i and then return the ratio of i to s (i/s).
1.6136 + if (interceptParam >= 0) {
1.6137 + // Since the mapping intercept parameter P is greater than zero, we use it
1.6138 + // to determine the point where our mapping function intersects the i=s
1.6139 + // line. This means that we have an equation of the form:
1.6140 + //
1.6141 + // i = m + s·(P/2)/(1 + P/2), if s <= (1 + P/2)·m
1.6142 + // i = s, if s >= (1 + P/2)·m
1.6143 +
1.6144 + float intercept = 1 + float(interceptParam)/2.0f;
1.6145 + if (ratio >= intercept) {
1.6146 + // If we're already at 1+P/2 or more times the minimum, don't scale.
1.6147 + return 1.0;
1.6148 + }
1.6149 +
1.6150 + // The point (intercept, intercept) is where the part of the i vs. s graph
1.6151 + // that's not slope 1 meets the i=s line. (This part of the
1.6152 + // graph is a line from (0, m), to that point). We calculate the
1.6153 + // intersection point to be ((1+P/2)m, (1+P/2)m), where P is the
1.6154 + // intercept parameter above. We then need to return i/s.
1.6155 + inflationRatio = (1.0f + (ratio * (intercept - 1) / intercept)) / ratio;
1.6156 + } else {
1.6157 + // This is the case where P is negative. We essentially want to implement
1.6158 + // the case for P=infinity here, so we make i = s + m, which means that
1.6159 + // i/s = s/s + m/s = 1 + 1/ratio
1.6160 + inflationRatio = 1 + 1.0f / ratio;
1.6161 + }
1.6162 +
1.6163 + if (maxRatio > 1.0 && inflationRatio > maxRatio) {
1.6164 + return maxRatio;
1.6165 + } else {
1.6166 + return inflationRatio;
1.6167 + }
1.6168 +}
1.6169 +
1.6170 +static bool
1.6171 +ShouldInflateFontsForContainer(const nsIFrame *aFrame)
1.6172 +{
1.6173 + // We only want to inflate fonts for text that is in a place
1.6174 + // with room to expand. The question is what the best heuristic for
1.6175 + // that is...
1.6176 + // For now, we're going to use NS_FRAME_IN_CONSTRAINED_HEIGHT, which
1.6177 + // indicates whether the frame is inside something with a constrained
1.6178 + // height (propagating down the tree), but the propagation stops when
1.6179 + // we hit overflow-y: scroll or auto.
1.6180 + const nsStyleText* styleText = aFrame->StyleText();
1.6181 +
1.6182 + return styleText->mTextSizeAdjust != NS_STYLE_TEXT_SIZE_ADJUST_NONE &&
1.6183 + !(aFrame->GetStateBits() & NS_FRAME_IN_CONSTRAINED_HEIGHT) &&
1.6184 + // We also want to disable font inflation for containers that have
1.6185 + // preformatted text.
1.6186 + styleText->WhiteSpaceCanWrap(aFrame);
1.6187 +}
1.6188 +
1.6189 +nscoord
1.6190 +nsLayoutUtils::InflationMinFontSizeFor(const nsIFrame *aFrame)
1.6191 +{
1.6192 + nsPresContext *presContext = aFrame->PresContext();
1.6193 + if (!FontSizeInflationEnabled(presContext) ||
1.6194 + presContext->mInflationDisabledForShrinkWrap) {
1.6195 + return 0;
1.6196 + }
1.6197 +
1.6198 + for (const nsIFrame *f = aFrame; f; f = f->GetParent()) {
1.6199 + if (f->IsContainerForFontSizeInflation()) {
1.6200 + if (!ShouldInflateFontsForContainer(f)) {
1.6201 + return 0;
1.6202 + }
1.6203 +
1.6204 + nsFontInflationData *data =
1.6205 + nsFontInflationData::FindFontInflationDataFor(aFrame);
1.6206 + // FIXME: The need to null-check here is sort of a bug, and might
1.6207 + // lead to incorrect results.
1.6208 + if (!data || !data->InflationEnabled()) {
1.6209 + return 0;
1.6210 + }
1.6211 +
1.6212 + return MinimumFontSizeFor(aFrame->PresContext(),
1.6213 + data->EffectiveWidth());
1.6214 + }
1.6215 + }
1.6216 +
1.6217 + NS_ABORT_IF_FALSE(false, "root should always be container");
1.6218 +
1.6219 + return 0;
1.6220 +}
1.6221 +
1.6222 +float
1.6223 +nsLayoutUtils::FontSizeInflationFor(const nsIFrame *aFrame)
1.6224 +{
1.6225 + if (aFrame->IsSVGText()) {
1.6226 + const nsIFrame* container = aFrame;
1.6227 + while (container->GetType() != nsGkAtoms::svgTextFrame) {
1.6228 + container = container->GetParent();
1.6229 + }
1.6230 + NS_ASSERTION(container, "expected to find an ancestor SVGTextFrame");
1.6231 + return
1.6232 + static_cast<const SVGTextFrame*>(container)->GetFontSizeScaleFactor();
1.6233 + }
1.6234 +
1.6235 + if (!FontSizeInflationEnabled(aFrame->PresContext())) {
1.6236 + return 1.0f;
1.6237 + }
1.6238 +
1.6239 + return FontSizeInflationInner(aFrame, InflationMinFontSizeFor(aFrame));
1.6240 +}
1.6241 +
1.6242 +/* static */ bool
1.6243 +nsLayoutUtils::FontSizeInflationEnabled(nsPresContext *aPresContext)
1.6244 +{
1.6245 + nsIPresShell* presShell = aPresContext->GetPresShell();
1.6246 +
1.6247 + if (!presShell) {
1.6248 + return false;
1.6249 + }
1.6250 +
1.6251 + return presShell->FontSizeInflationEnabled();
1.6252 +}
1.6253 +
1.6254 +/* static */ nsRect
1.6255 +nsLayoutUtils::GetBoxShadowRectForFrame(nsIFrame* aFrame,
1.6256 + const nsSize& aFrameSize)
1.6257 +{
1.6258 + nsCSSShadowArray* boxShadows = aFrame->StyleBorder()->mBoxShadow;
1.6259 + if (!boxShadows) {
1.6260 + return nsRect();
1.6261 + }
1.6262 +
1.6263 + nsRect shadows;
1.6264 + int32_t A2D = aFrame->PresContext()->AppUnitsPerDevPixel();
1.6265 + for (uint32_t i = 0; i < boxShadows->Length(); ++i) {
1.6266 + nsRect tmpRect(nsPoint(0, 0), aFrameSize);
1.6267 + nsCSSShadowItem* shadow = boxShadows->ShadowAt(i);
1.6268 +
1.6269 + // inset shadows are never painted outside the frame
1.6270 + if (shadow->mInset)
1.6271 + continue;
1.6272 +
1.6273 + tmpRect.MoveBy(nsPoint(shadow->mXOffset, shadow->mYOffset));
1.6274 + tmpRect.Inflate(shadow->mSpread);
1.6275 + tmpRect.Inflate(
1.6276 + nsContextBoxBlur::GetBlurRadiusMargin(shadow->mRadius, A2D));
1.6277 + shadows.UnionRect(shadows, tmpRect);
1.6278 + }
1.6279 + return shadows;
1.6280 +}
1.6281 +
1.6282 +/* static */ void
1.6283 +nsLayoutUtils::UpdateImageVisibilityForFrame(nsIFrame* aImageFrame)
1.6284 +{
1.6285 +#ifdef DEBUG
1.6286 + nsIAtom* type = aImageFrame->GetType();
1.6287 + MOZ_ASSERT(type == nsGkAtoms::imageFrame ||
1.6288 + type == nsGkAtoms::imageControlFrame ||
1.6289 + type == nsGkAtoms::svgImageFrame, "wrong type of frame");
1.6290 +#endif
1.6291 +
1.6292 + nsCOMPtr<nsIImageLoadingContent> content = do_QueryInterface(aImageFrame->GetContent());
1.6293 + if (!content) {
1.6294 + return;
1.6295 + }
1.6296 +
1.6297 + nsIPresShell* presShell = aImageFrame->PresContext()->PresShell();
1.6298 + if (presShell->AssumeAllImagesVisible()) {
1.6299 + presShell->EnsureImageInVisibleList(content);
1.6300 + return;
1.6301 + }
1.6302 +
1.6303 + bool visible = true;
1.6304 + nsIFrame* f = aImageFrame->GetParent();
1.6305 + nsRect rect = aImageFrame->GetContentRectRelativeToSelf();
1.6306 + nsIFrame* rectFrame = aImageFrame;
1.6307 + while (f) {
1.6308 + nsIScrollableFrame* sf = do_QueryFrame(f);
1.6309 + if (sf) {
1.6310 + nsRect transformedRect =
1.6311 + nsLayoutUtils::TransformFrameRectToAncestor(rectFrame, rect, f);
1.6312 + if (!sf->IsRectNearlyVisible(transformedRect)) {
1.6313 + visible = false;
1.6314 + break;
1.6315 + }
1.6316 + // Move transformedRect to be contained in the scrollport as best we can
1.6317 + // (it might not fit) to pretend that it was scrolled into view.
1.6318 + nsRect scrollPort = sf->GetScrollPortRect();
1.6319 + if (transformedRect.XMost() > scrollPort.XMost()) {
1.6320 + transformedRect.x -= transformedRect.XMost() - scrollPort.XMost();
1.6321 + }
1.6322 + if (transformedRect.x < scrollPort.x) {
1.6323 + transformedRect.x = scrollPort.x;
1.6324 + }
1.6325 + if (transformedRect.YMost() > scrollPort.YMost()) {
1.6326 + transformedRect.y -= transformedRect.YMost() - scrollPort.YMost();
1.6327 + }
1.6328 + if (transformedRect.y < scrollPort.y) {
1.6329 + transformedRect.y = scrollPort.y;
1.6330 + }
1.6331 + transformedRect.width = std::min(transformedRect.width, scrollPort.width);
1.6332 + transformedRect.height = std::min(transformedRect.height, scrollPort.height);
1.6333 + rect = transformedRect;
1.6334 + rectFrame = f;
1.6335 + }
1.6336 + nsIFrame* parent = f->GetParent();
1.6337 + if (!parent) {
1.6338 + parent = nsLayoutUtils::GetCrossDocParentFrame(f);
1.6339 + if (parent && parent->PresContext()->IsChrome()) {
1.6340 + break;
1.6341 + }
1.6342 + }
1.6343 + f = parent;
1.6344 + }
1.6345 +
1.6346 + if (visible) {
1.6347 + presShell->EnsureImageInVisibleList(content);
1.6348 + } else {
1.6349 + presShell->RemoveImageFromVisibleList(content);
1.6350 + }
1.6351 +}
1.6352 +
1.6353 +/* static */ nsSize
1.6354 +nsLayoutUtils::CalculateCompositionSizeForFrame(nsIFrame* aFrame)
1.6355 +{
1.6356 + nsSize size(aFrame->GetSize());
1.6357 +
1.6358 + nsPresContext* presContext = aFrame->PresContext();
1.6359 + nsIPresShell* presShell = presContext->PresShell();
1.6360 +
1.6361 + // See the comments in the code that calculates the root
1.6362 + // composition bounds in RecordFrameMetrics.
1.6363 + // TODO: Reuse that code here.
1.6364 + bool isRootContentDocRootScrollFrame = presContext->IsRootContentDocument()
1.6365 + && aFrame == presShell->GetRootScrollFrame();
1.6366 + if (isRootContentDocRootScrollFrame) {
1.6367 + if (nsIFrame* rootFrame = presShell->GetRootFrame()) {
1.6368 + if (nsView* view = rootFrame->GetView()) {
1.6369 + nsSize viewSize = view->GetBounds().Size();
1.6370 + nsIWidget* widget =
1.6371 +#ifdef MOZ_WIDGET_ANDROID
1.6372 + rootFrame->GetNearestWidget();
1.6373 +#else
1.6374 + view->GetWidget();
1.6375 +#endif
1.6376 + if (widget) {
1.6377 + nsIntRect widgetBounds;
1.6378 + widget->GetBounds(widgetBounds);
1.6379 + int32_t auPerDevPixel = presContext->AppUnitsPerDevPixel();
1.6380 + size = nsSize(widgetBounds.width * auPerDevPixel,
1.6381 + widgetBounds.height * auPerDevPixel);
1.6382 +#ifdef MOZ_WIDGET_ANDROID
1.6383 + if (viewSize.height < size.height) {
1.6384 + size.height = viewSize.height;
1.6385 + }
1.6386 +#endif
1.6387 + } else {
1.6388 + size = viewSize;
1.6389 + }
1.6390 + }
1.6391 + }
1.6392 + }
1.6393 +
1.6394 + // Adjust composition bounds for the size of scroll bars.
1.6395 + nsIScrollableFrame* scrollableFrame = aFrame->GetScrollTargetFrame();
1.6396 + if (scrollableFrame && !LookAndFeel::GetInt(LookAndFeel::eIntID_UseOverlayScrollbars)) {
1.6397 + nsMargin margins = scrollableFrame->GetActualScrollbarSizes();
1.6398 + size.width -= margins.LeftRight();
1.6399 + size.height -= margins.TopBottom();
1.6400 + }
1.6401 +
1.6402 + return size;
1.6403 +}
1.6404 +/* static */ CSSSize
1.6405 +nsLayoutUtils::CalculateRootCompositionSize(nsIFrame* aFrame,
1.6406 + bool aIsRootContentDocRootScrollFrame,
1.6407 + const FrameMetrics& aMetrics)
1.6408 +{
1.6409 +
1.6410 + if (aIsRootContentDocRootScrollFrame) {
1.6411 + return ViewAs<LayerPixel>(ParentLayerSize(aMetrics.mCompositionBounds.Size()),
1.6412 + PixelCastJustification::ParentLayerToLayerForRootComposition)
1.6413 + / aMetrics.LayersPixelsPerCSSPixel();
1.6414 + }
1.6415 + nsPresContext* presContext = aFrame->PresContext();
1.6416 + LayerSize rootCompositionSize;
1.6417 + nsPresContext* rootPresContext =
1.6418 + presContext->GetToplevelContentDocumentPresContext();
1.6419 + if (!rootPresContext) {
1.6420 + rootPresContext = presContext->GetRootPresContext();
1.6421 + }
1.6422 + nsIPresShell* rootPresShell = nullptr;
1.6423 + if (rootPresContext) {
1.6424 + // See the comments in the code that calculates the root
1.6425 + // composition bounds in RecordFrameMetrics.
1.6426 + // TODO: Reuse that code here.
1.6427 + nsIPresShell* rootPresShell = rootPresContext->PresShell();
1.6428 + if (nsIFrame* rootFrame = rootPresShell->GetRootFrame()) {
1.6429 + if (nsView* view = rootFrame->GetView()) {
1.6430 + LayoutDeviceToParentLayerScale parentResolution(
1.6431 + rootPresShell->GetCumulativeResolution().width
1.6432 + / rootPresShell->GetResolution().width);
1.6433 + int32_t rootAUPerDevPixel = rootPresContext->AppUnitsPerDevPixel();
1.6434 + nsRect viewBounds = view->GetBounds();
1.6435 + LayerSize viewSize = ViewAs<LayerPixel>(
1.6436 + (LayoutDeviceRect::FromAppUnits(viewBounds, rootAUPerDevPixel)
1.6437 + * parentResolution).Size(), PixelCastJustification::ParentLayerToLayerForRootComposition);
1.6438 + nsIWidget* widget =
1.6439 +#ifdef MOZ_WIDGET_ANDROID
1.6440 + rootFrame->GetNearestWidget();
1.6441 +#else
1.6442 + view->GetWidget();
1.6443 +#endif
1.6444 + if (widget) {
1.6445 + nsIntRect widgetBounds;
1.6446 + widget->GetBounds(widgetBounds);
1.6447 + rootCompositionSize = LayerSize(ViewAs<LayerPixel>(widgetBounds.Size()));
1.6448 +#ifdef MOZ_WIDGET_ANDROID
1.6449 + if (viewSize.height < rootCompositionSize.height) {
1.6450 + rootCompositionSize.height = viewSize.height;
1.6451 + }
1.6452 +#endif
1.6453 + } else {
1.6454 + rootCompositionSize = viewSize;
1.6455 + }
1.6456 + }
1.6457 + }
1.6458 + } else {
1.6459 + nsIWidget* widget = aFrame->GetNearestWidget();
1.6460 + nsIntRect widgetBounds;
1.6461 + widget->GetBounds(widgetBounds);
1.6462 + rootCompositionSize = LayerSize(ViewAs<LayerPixel>(widgetBounds.Size()));
1.6463 + }
1.6464 +
1.6465 + // Adjust composition size for the size of scroll bars.
1.6466 + nsIFrame* rootRootScrollFrame = rootPresShell ? rootPresShell->GetRootScrollFrame() : nullptr;
1.6467 + nsIScrollableFrame* rootScrollableFrame = nullptr;
1.6468 + if (rootRootScrollFrame) {
1.6469 + rootScrollableFrame = rootRootScrollFrame->GetScrollTargetFrame();
1.6470 + }
1.6471 + if (rootScrollableFrame && !LookAndFeel::GetInt(LookAndFeel::eIntID_UseOverlayScrollbars)) {
1.6472 + CSSMargin margins = CSSMargin::FromAppUnits(rootScrollableFrame->GetActualScrollbarSizes());
1.6473 + // Scrollbars are not subject to scaling, so CSS pixels = layer pixels for them.
1.6474 + rootCompositionSize.width -= margins.LeftRight();
1.6475 + rootCompositionSize.height -= margins.TopBottom();
1.6476 + }
1.6477 +
1.6478 + return rootCompositionSize / aMetrics.LayersPixelsPerCSSPixel();
1.6479 +}
1.6480 +
1.6481 +/* static */ nsRect
1.6482 +nsLayoutUtils::CalculateScrollableRectForFrame(nsIScrollableFrame* aScrollableFrame, nsIFrame* aRootFrame)
1.6483 +{
1.6484 + nsRect contentBounds;
1.6485 + if (aScrollableFrame) {
1.6486 + contentBounds = aScrollableFrame->GetScrollRange();
1.6487 +
1.6488 + // We ifndef the below code for Fennec because it requires special behaviour
1.6489 + // on the APZC side. Because Fennec has it's own PZC implementation which doesn't
1.6490 + // provide the special behaviour, this code will cause it to break. We can remove
1.6491 + // the ifndef once Fennec switches over to APZ or if we add the special handling
1.6492 + // to Fennec
1.6493 +#ifndef MOZ_WIDGET_ANDROID
1.6494 + nsPoint scrollPosition = aScrollableFrame->GetScrollPosition();
1.6495 + if (aScrollableFrame->GetScrollbarStyles().mVertical == NS_STYLE_OVERFLOW_HIDDEN) {
1.6496 + contentBounds.y = scrollPosition.y;
1.6497 + contentBounds.height = 0;
1.6498 + }
1.6499 + if (aScrollableFrame->GetScrollbarStyles().mHorizontal == NS_STYLE_OVERFLOW_HIDDEN) {
1.6500 + contentBounds.x = scrollPosition.x;
1.6501 + contentBounds.width = 0;
1.6502 + }
1.6503 +#endif
1.6504 +
1.6505 + contentBounds.width += aScrollableFrame->GetScrollPortRect().width;
1.6506 + contentBounds.height += aScrollableFrame->GetScrollPortRect().height;
1.6507 + } else {
1.6508 + contentBounds = aRootFrame->GetRect();
1.6509 + }
1.6510 + return contentBounds;
1.6511 +}
1.6512 +
1.6513 +/* static */ nsRect
1.6514 +nsLayoutUtils::CalculateExpandedScrollableRect(nsIFrame* aFrame)
1.6515 +{
1.6516 + nsRect scrollableRect =
1.6517 + CalculateScrollableRectForFrame(aFrame->GetScrollTargetFrame(),
1.6518 + aFrame->PresContext()->PresShell()->GetRootFrame());
1.6519 + nsSize compSize = CalculateCompositionSizeForFrame(aFrame);
1.6520 +
1.6521 + if (aFrame == aFrame->PresContext()->PresShell()->GetRootScrollFrame()) {
1.6522 + // the composition size for the root scroll frame does not include the
1.6523 + // local resolution, so we adjust.
1.6524 + gfxSize res = aFrame->PresContext()->PresShell()->GetResolution();
1.6525 + compSize.width = NSToCoordRound(compSize.width / ((float) res.width));
1.6526 + compSize.height = NSToCoordRound(compSize.height / ((float) res.height));
1.6527 + }
1.6528 +
1.6529 + if (scrollableRect.width < compSize.width) {
1.6530 + scrollableRect.x = std::max(0,
1.6531 + scrollableRect.x - (compSize.width - scrollableRect.width));
1.6532 + scrollableRect.width = compSize.width;
1.6533 + }
1.6534 +
1.6535 + if (scrollableRect.height < compSize.height) {
1.6536 + scrollableRect.y = std::max(0,
1.6537 + scrollableRect.y - (compSize.height - scrollableRect.height));
1.6538 + scrollableRect.height = compSize.height;
1.6539 + }
1.6540 + return scrollableRect;
1.6541 +}
1.6542 +
1.6543 +/* static */ bool
1.6544 +nsLayoutUtils::WantSubAPZC()
1.6545 +{
1.6546 + // TODO Turn this on for inprocess OMTC on all platforms
1.6547 + bool wantSubAPZC = gfxPrefs::APZSubframeEnabled();
1.6548 +#ifdef MOZ_WIDGET_GONK
1.6549 + if (XRE_GetProcessType() != GeckoProcessType_Content) {
1.6550 + wantSubAPZC = false;
1.6551 + }
1.6552 +#endif
1.6553 + return wantSubAPZC;
1.6554 + }
1.6555 +
1.6556 +nsLayoutUtils::SurfaceFromElementResult::SurfaceFromElementResult()
1.6557 + // Use safe default values here
1.6558 + : mIsWriteOnly(true)
1.6559 + , mIsStillLoading(false)
1.6560 + , mCORSUsed(false)
1.6561 + , mIsPremultiplied(true)
1.6562 +{
1.6563 +}
1.6564 +
1.6565 +bool
1.6566 +nsLayoutUtils::IsNonWrapperBlock(nsIFrame* aFrame)
1.6567 +{
1.6568 + return GetAsBlock(aFrame) && !aFrame->IsBlockWrapper();
1.6569 +}
1.6570 +
1.6571 +bool
1.6572 +nsLayoutUtils::NeedsPrintPreviewBackground(nsPresContext* aPresContext)
1.6573 +{
1.6574 + return aPresContext->IsRootPaginatedDocument() &&
1.6575 + (aPresContext->Type() == nsPresContext::eContext_PrintPreview ||
1.6576 + aPresContext->Type() == nsPresContext::eContext_PageLayout);
1.6577 +}
1.6578 +
1.6579 +AutoMaybeDisableFontInflation::AutoMaybeDisableFontInflation(nsIFrame *aFrame)
1.6580 +{
1.6581 + // FIXME: Now that inflation calculations are based on the flow
1.6582 + // root's NCA's (nearest common ancestor of its inflatable
1.6583 + // descendants) width, we could probably disable inflation in
1.6584 + // fewer cases than we currently do.
1.6585 + if (aFrame->IsContainerForFontSizeInflation()) {
1.6586 + mPresContext = aFrame->PresContext();
1.6587 + mOldValue = mPresContext->mInflationDisabledForShrinkWrap;
1.6588 + mPresContext->mInflationDisabledForShrinkWrap = true;
1.6589 + } else {
1.6590 + // indicate we have nothing to restore
1.6591 + mPresContext = nullptr;
1.6592 + }
1.6593 +}
1.6594 +
1.6595 +AutoMaybeDisableFontInflation::~AutoMaybeDisableFontInflation()
1.6596 +{
1.6597 + if (mPresContext) {
1.6598 + mPresContext->mInflationDisabledForShrinkWrap = mOldValue;
1.6599 + }
1.6600 +}
