1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/layers/FrameMetrics.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,587 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
1.5 + * This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#ifndef GFX_FRAMEMETRICS_H
1.10 +#define GFX_FRAMEMETRICS_H
1.11 +
1.12 +#include <stdint.h> // for uint32_t, uint64_t
1.13 +#include <string> // for std::string
1.14 +#include "Units.h" // for CSSRect, CSSPixel, etc
1.15 +#include "mozilla/gfx/BasePoint.h" // for BasePoint
1.16 +#include "mozilla/gfx/Rect.h" // for RoundedIn
1.17 +#include "mozilla/gfx/ScaleFactor.h" // for ScaleFactor
1.18 +#include "mozilla/gfx/Logging.h" // for Log
1.19 +
1.20 +namespace IPC {
1.21 +template <typename T> struct ParamTraits;
1.22 +} // namespace IPC
1.23 +
1.24 +namespace mozilla {
1.25 +
1.26 +// The layer coordinates of the parent layer.
1.27 +// This can be arrived at in two ways:
1.28 +// - Start with the CSS coordinates of the parent layer (note: NOT the
1.29 +// CSS coordinates of the current layer, that will give you the wrong
1.30 +// answer), multiply by the device scale and the resolutions of all
1.31 +// layers from the root down to and including the parent.
1.32 +// - Start with global screen coordinates and unapply all CSS and async
1.33 +// transforms from the root down to and including the parent.
1.34 +// It's helpful to look at https://wiki.mozilla.org/Platform/GFX/APZ#Coordinate_systems
1.35 +// to get a picture of how the various coordinate systems relate to each other.
1.36 +struct ParentLayerPixel {};
1.37 +
1.38 +typedef gfx::PointTyped<ParentLayerPixel> ParentLayerPoint;
1.39 +typedef gfx::RectTyped<ParentLayerPixel> ParentLayerRect;
1.40 +typedef gfx::SizeTyped<ParentLayerPixel> ParentLayerSize;
1.41 +
1.42 +typedef gfx::IntMarginTyped<ParentLayerPixel> ParentLayerIntMargin;
1.43 +typedef gfx::IntPointTyped<ParentLayerPixel> ParentLayerIntPoint;
1.44 +typedef gfx::IntRectTyped<ParentLayerPixel> ParentLayerIntRect;
1.45 +typedef gfx::IntSizeTyped<ParentLayerPixel> ParentLayerIntSize;
1.46 +
1.47 +typedef gfx::ScaleFactor<CSSPixel, ParentLayerPixel> CSSToParentLayerScale;
1.48 +typedef gfx::ScaleFactor<LayoutDevicePixel, ParentLayerPixel> LayoutDeviceToParentLayerScale;
1.49 +typedef gfx::ScaleFactor<ScreenPixel, ParentLayerPixel> ScreenToParentLayerScale;
1.50 +
1.51 +typedef gfx::ScaleFactor<ParentLayerPixel, LayerPixel> ParentLayerToLayerScale;
1.52 +typedef gfx::ScaleFactor<ParentLayerPixel, ScreenPixel> ParentLayerToScreenScale;
1.53 +
1.54 +
1.55 +namespace layers {
1.56 +
1.57 +/**
1.58 + * The viewport and displayport metrics for the painted frame at the
1.59 + * time of a layer-tree transaction. These metrics are especially
1.60 + * useful for shadow layers, because the metrics values are updated
1.61 + * atomically with new pixels.
1.62 + */
1.63 +struct FrameMetrics {
1.64 + friend struct IPC::ParamTraits<mozilla::layers::FrameMetrics>;
1.65 +public:
1.66 + // We use IDs to identify frames across processes.
1.67 + typedef uint64_t ViewID;
1.68 + static const ViewID NULL_SCROLL_ID; // This container layer does not scroll.
1.69 + static const ViewID START_SCROLL_ID = 2; // This is the ID that scrolling subframes
1.70 + // will begin at.
1.71 +
1.72 + FrameMetrics()
1.73 + : mCompositionBounds(0, 0, 0, 0)
1.74 + , mDisplayPort(0, 0, 0, 0)
1.75 + , mCriticalDisplayPort(0, 0, 0, 0)
1.76 + , mViewport(0, 0, 0, 0)
1.77 + , mScrollableRect(0, 0, 0, 0)
1.78 + , mResolution(1)
1.79 + , mCumulativeResolution(1)
1.80 + , mTransformScale(1)
1.81 + , mDevPixelsPerCSSPixel(1)
1.82 + , mPresShellId(-1)
1.83 + , mMayHaveTouchListeners(false)
1.84 + , mIsRoot(false)
1.85 + , mHasScrollgrab(false)
1.86 + , mScrollId(NULL_SCROLL_ID)
1.87 + , mScrollOffset(0, 0)
1.88 + , mZoom(1)
1.89 + , mUpdateScrollOffset(false)
1.90 + , mScrollGeneration(0)
1.91 + , mRootCompositionSize(0, 0)
1.92 + , mDisplayPortMargins(0, 0, 0, 0)
1.93 + , mUseDisplayPortMargins(false)
1.94 + {}
1.95 +
1.96 + // Default copy ctor and operator= are fine
1.97 +
1.98 + bool operator==(const FrameMetrics& aOther) const
1.99 + {
1.100 + // mContentDescription is not compared on purpose as it's only used
1.101 + // for debugging.
1.102 + return mCompositionBounds.IsEqualEdges(aOther.mCompositionBounds) &&
1.103 + mRootCompositionSize == aOther.mRootCompositionSize &&
1.104 + mDisplayPort.IsEqualEdges(aOther.mDisplayPort) &&
1.105 + mDisplayPortMargins == aOther.mDisplayPortMargins &&
1.106 + mUseDisplayPortMargins == aOther.mUseDisplayPortMargins &&
1.107 + mCriticalDisplayPort.IsEqualEdges(aOther.mCriticalDisplayPort) &&
1.108 + mViewport.IsEqualEdges(aOther.mViewport) &&
1.109 + mScrollableRect.IsEqualEdges(aOther.mScrollableRect) &&
1.110 + mResolution == aOther.mResolution &&
1.111 + mCumulativeResolution == aOther.mCumulativeResolution &&
1.112 + mDevPixelsPerCSSPixel == aOther.mDevPixelsPerCSSPixel &&
1.113 + mMayHaveTouchListeners == aOther.mMayHaveTouchListeners &&
1.114 + mPresShellId == aOther.mPresShellId &&
1.115 + mIsRoot == aOther.mIsRoot &&
1.116 + mScrollId == aOther.mScrollId &&
1.117 + mScrollOffset == aOther.mScrollOffset &&
1.118 + mHasScrollgrab == aOther.mHasScrollgrab &&
1.119 + mUpdateScrollOffset == aOther.mUpdateScrollOffset;
1.120 + }
1.121 + bool operator!=(const FrameMetrics& aOther) const
1.122 + {
1.123 + return !operator==(aOther);
1.124 + }
1.125 +
1.126 + bool IsDefault() const
1.127 + {
1.128 + FrameMetrics def;
1.129 +
1.130 + def.mPresShellId = mPresShellId;
1.131 + return (def == *this);
1.132 + }
1.133 +
1.134 + bool IsRootScrollable() const
1.135 + {
1.136 + return mIsRoot;
1.137 + }
1.138 +
1.139 + bool IsScrollable() const
1.140 + {
1.141 + return mScrollId != NULL_SCROLL_ID;
1.142 + }
1.143 +
1.144 + CSSToLayerScale LayersPixelsPerCSSPixel() const
1.145 + {
1.146 + return mCumulativeResolution * mDevPixelsPerCSSPixel;
1.147 + }
1.148 +
1.149 + LayerPoint GetScrollOffsetInLayerPixels() const
1.150 + {
1.151 + return GetScrollOffset() * LayersPixelsPerCSSPixel();
1.152 + }
1.153 +
1.154 + LayoutDeviceToParentLayerScale GetParentResolution() const
1.155 + {
1.156 + return mCumulativeResolution / mResolution;
1.157 + }
1.158 +
1.159 + // Ensure the scrollableRect is at least as big as the compositionBounds
1.160 + // because the scrollableRect can be smaller if the content is not large
1.161 + // and the scrollableRect hasn't been updated yet.
1.162 + // We move the scrollableRect up because we don't know if we can move it
1.163 + // down. i.e. we know that scrollableRect can go back as far as zero.
1.164 + // but we don't know how much further ahead it can go.
1.165 + CSSRect GetExpandedScrollableRect() const
1.166 + {
1.167 + CSSRect scrollableRect = mScrollableRect;
1.168 + CSSSize compSize = CalculateCompositedSizeInCssPixels();
1.169 + if (scrollableRect.width < compSize.width) {
1.170 + scrollableRect.x = std::max(0.f,
1.171 + scrollableRect.x - (compSize.width - scrollableRect.width));
1.172 + scrollableRect.width = compSize.width;
1.173 + }
1.174 +
1.175 + if (scrollableRect.height < compSize.height) {
1.176 + scrollableRect.y = std::max(0.f,
1.177 + scrollableRect.y - (compSize.height - scrollableRect.height));
1.178 + scrollableRect.height = compSize.height;
1.179 + }
1.180 +
1.181 + return scrollableRect;
1.182 + }
1.183 +
1.184 + // Return the scale factor needed to fit the viewport
1.185 + // into its composition bounds.
1.186 + CSSToScreenScale CalculateIntrinsicScale() const
1.187 + {
1.188 + return CSSToScreenScale(float(mCompositionBounds.width) / float(mViewport.width));
1.189 + }
1.190 +
1.191 + // Return the scale factor for converting from CSS pixels (for this layer)
1.192 + // to layer pixels of our parent layer. Much as mZoom is used to interface
1.193 + // between inputs we get in screen pixels and quantities in CSS pixels,
1.194 + // this is used to interface between mCompositionBounds and quantities
1.195 + // in CSS pixels.
1.196 + CSSToParentLayerScale GetZoomToParent() const
1.197 + {
1.198 + return mZoom * mTransformScale;
1.199 + }
1.200 +
1.201 + CSSSize CalculateCompositedSizeInCssPixels() const
1.202 + {
1.203 + return mCompositionBounds.Size() / GetZoomToParent();
1.204 + }
1.205 +
1.206 + CSSRect CalculateCompositedRectInCssPixels() const
1.207 + {
1.208 + return mCompositionBounds / GetZoomToParent();
1.209 + }
1.210 +
1.211 + void ScrollBy(const CSSPoint& aPoint)
1.212 + {
1.213 + mScrollOffset += aPoint;
1.214 + }
1.215 +
1.216 + void ZoomBy(float aFactor)
1.217 + {
1.218 + mZoom.scale *= aFactor;
1.219 + }
1.220 +
1.221 + void CopyScrollInfoFrom(const FrameMetrics& aOther)
1.222 + {
1.223 + mScrollOffset = aOther.mScrollOffset;
1.224 + mScrollGeneration = aOther.mScrollGeneration;
1.225 + }
1.226 +
1.227 + // ---------------------------------------------------------------------------
1.228 + // The following metrics are all in widget space/device pixels.
1.229 + //
1.230 +
1.231 + // This is the area within the widget that we're compositing to. It is relative
1.232 + // to the layer tree origin.
1.233 + //
1.234 + // This is useful because, on mobile, the viewport and composition dimensions
1.235 + // are not always the same. In this case, we calculate the displayport using
1.236 + // an area bigger than the region we're compositing to. If we used the
1.237 + // viewport dimensions to calculate the displayport, we'd run into situations
1.238 + // where we're prerendering the wrong regions and the content may be clipped,
1.239 + // or too much of it prerendered. If the composition dimensions are the same as the
1.240 + // viewport dimensions, there is no need for this and we can just use the viewport
1.241 + // instead.
1.242 + //
1.243 + // This value is valid for nested scrollable layers as well, and is still
1.244 + // relative to the layer tree origin. This value is provided by Gecko at
1.245 + // layout/paint time.
1.246 + ParentLayerIntRect mCompositionBounds;
1.247 +
1.248 + // ---------------------------------------------------------------------------
1.249 + // The following metrics are all in CSS pixels. They are not in any uniform
1.250 + // space, so each is explained separately.
1.251 + //
1.252 +
1.253 + // The area of a frame's contents that has been painted, relative to the
1.254 + // viewport. It is in the same coordinate space as |mViewport|. For example,
1.255 + // if it is at 0,0, then it's at the same place at the viewport, which is at
1.256 + // the top-left in the layer, and at the same place as the scroll offset of
1.257 + // the document.
1.258 + //
1.259 + // Note that this is structured in such a way that it doesn't depend on the
1.260 + // method layout uses to scroll content.
1.261 + //
1.262 + // May be larger or smaller than |mScrollableRect|.
1.263 + //
1.264 + // To pre-render a margin of 100 CSS pixels around the window,
1.265 + // { x = -100, y = - 100,
1.266 + // width = window.innerWidth + 200, height = window.innerHeight + 200 }
1.267 + CSSRect mDisplayPort;
1.268 +
1.269 + // If non-empty, the area of a frame's contents that is considered critical
1.270 + // to paint. Area outside of this area (i.e. area inside mDisplayPort, but
1.271 + // outside of mCriticalDisplayPort) is considered low-priority, and may be
1.272 + // painted with lower precision, or not painted at all.
1.273 + //
1.274 + // The same restrictions for mDisplayPort apply here.
1.275 + CSSRect mCriticalDisplayPort;
1.276 +
1.277 + // The CSS viewport, which is the dimensions we're using to constrain the
1.278 + // <html> element of this frame, relative to the top-left of the layer. Note
1.279 + // that its offset is structured in such a way that it doesn't depend on the
1.280 + // method layout uses to scroll content.
1.281 + //
1.282 + // This is mainly useful on the root layer, however nested iframes can have
1.283 + // their own viewport, which will just be the size of the window of the
1.284 + // iframe. For layers that don't correspond to a document, this metric is
1.285 + // meaningless and invalid.
1.286 + CSSRect mViewport;
1.287 +
1.288 + // The scrollable bounds of a frame. This is determined by reflow.
1.289 + // Ordinarily the x and y will be 0 and the width and height will be the
1.290 + // size of the element being scrolled. However for RTL pages or elements
1.291 + // the x value may be negative.
1.292 + //
1.293 + // This is relative to the document. It is in the same coordinate space as
1.294 + // |mScrollOffset|, but a different coordinate space than |mViewport| and
1.295 + // |mDisplayPort|. Note also that this coordinate system is understood by
1.296 + // window.scrollTo().
1.297 + //
1.298 + // This is valid on any layer unless it has no content.
1.299 + CSSRect mScrollableRect;
1.300 +
1.301 + // ---------------------------------------------------------------------------
1.302 + // The following metrics are dimensionless.
1.303 + //
1.304 +
1.305 + // The incremental resolution that the current frame has been painted at
1.306 + // relative to the parent frame's resolution. This information is provided
1.307 + // by Gecko at layout/paint time.
1.308 + ParentLayerToLayerScale mResolution;
1.309 +
1.310 + // The cumulative resolution that the current frame has been painted at.
1.311 + // This is the product of our mResolution and the mResolutions of our parent frames.
1.312 + // This information is provided by Gecko at layout/paint time.
1.313 + LayoutDeviceToLayerScale mCumulativeResolution;
1.314 +
1.315 + // The conversion factor between local screen pixels (the coordinate
1.316 + // system in which APZCs receive input events) and our parent layer's
1.317 + // layer pixels (the coordinate system of mCompositionBounds).
1.318 + // This consists of the scale of the local CSS transform and the
1.319 + // nontransient async transform.
1.320 + // TODO: APZ does not currently work well if there is a CSS transform
1.321 + // on the layer being scrolled that's not just a scale that's
1.322 + // the same in both directions. When we fix this, mTransformScale
1.323 + // will probably need to turn into a matrix.
1.324 + ScreenToParentLayerScale mTransformScale;
1.325 +
1.326 + // The conversion factor between CSS pixels and device pixels for this frame.
1.327 + // This can vary based on a variety of things, such as reflowing-zoom. The
1.328 + // conversion factor for device pixels to layers pixels is just the
1.329 + // resolution.
1.330 + CSSToLayoutDeviceScale mDevPixelsPerCSSPixel;
1.331 +
1.332 + uint32_t mPresShellId;
1.333 +
1.334 + // Whether or not this frame may have touch listeners.
1.335 + bool mMayHaveTouchListeners;
1.336 +
1.337 + // Whether or not this is the root scroll frame for the root content document.
1.338 + bool mIsRoot;
1.339 +
1.340 + // Whether or not this frame is for an element marked 'scrollgrab'.
1.341 + bool mHasScrollgrab;
1.342 +
1.343 +public:
1.344 + void SetScrollOffset(const CSSPoint& aScrollOffset)
1.345 + {
1.346 + mScrollOffset = aScrollOffset;
1.347 + }
1.348 +
1.349 + const CSSPoint& GetScrollOffset() const
1.350 + {
1.351 + return mScrollOffset;
1.352 + }
1.353 +
1.354 + void SetZoom(const CSSToScreenScale& aZoom)
1.355 + {
1.356 + mZoom = aZoom;
1.357 + }
1.358 +
1.359 + CSSToScreenScale GetZoom() const
1.360 + {
1.361 + return mZoom;
1.362 + }
1.363 +
1.364 + void SetScrollOffsetUpdated(uint32_t aScrollGeneration)
1.365 + {
1.366 + mUpdateScrollOffset = true;
1.367 + mScrollGeneration = aScrollGeneration;
1.368 + }
1.369 +
1.370 + bool GetScrollOffsetUpdated() const
1.371 + {
1.372 + return mUpdateScrollOffset;
1.373 + }
1.374 +
1.375 + uint32_t GetScrollGeneration() const
1.376 + {
1.377 + return mScrollGeneration;
1.378 + }
1.379 +
1.380 + const std::string& GetContentDescription() const
1.381 + {
1.382 + return mContentDescription;
1.383 + }
1.384 +
1.385 + void SetContentDescription(const std::string& aContentDescription)
1.386 + {
1.387 + mContentDescription = aContentDescription;
1.388 + }
1.389 +
1.390 + ViewID GetScrollId() const
1.391 + {
1.392 + return mScrollId;
1.393 + }
1.394 +
1.395 + void SetScrollId(ViewID scrollId)
1.396 + {
1.397 + mScrollId = scrollId;
1.398 + }
1.399 +
1.400 + void SetRootCompositionSize(const CSSSize& aRootCompositionSize)
1.401 + {
1.402 + mRootCompositionSize = aRootCompositionSize;
1.403 + }
1.404 +
1.405 + const CSSSize& GetRootCompositionSize() const
1.406 + {
1.407 + return mRootCompositionSize;
1.408 + }
1.409 +
1.410 + void SetDisplayPortMargins(const LayerMargin& aDisplayPortMargins)
1.411 + {
1.412 + mDisplayPortMargins = aDisplayPortMargins;
1.413 + }
1.414 +
1.415 + const LayerMargin& GetDisplayPortMargins() const
1.416 + {
1.417 + return mDisplayPortMargins;
1.418 + }
1.419 +
1.420 + void SetUseDisplayPortMargins()
1.421 + {
1.422 + mUseDisplayPortMargins = true;
1.423 + }
1.424 +
1.425 + bool GetUseDisplayPortMargins() const
1.426 + {
1.427 + return mUseDisplayPortMargins;
1.428 + }
1.429 +
1.430 +private:
1.431 + // New fields from now on should be made private and old fields should
1.432 + // be refactored to be private.
1.433 +
1.434 + // A unique ID assigned to each scrollable frame.
1.435 + ViewID mScrollId;
1.436 +
1.437 + // The position of the top-left of the CSS viewport, relative to the document
1.438 + // (or the document relative to the viewport, if that helps understand it).
1.439 + //
1.440 + // Thus it is relative to the document. It is in the same coordinate space as
1.441 + // |mScrollableRect|, but a different coordinate space than |mViewport| and
1.442 + // |mDisplayPort|.
1.443 + //
1.444 + // It is required that the rect:
1.445 + // { x = mScrollOffset.x, y = mScrollOffset.y,
1.446 + // width = mCompositionBounds.x / mResolution.scale,
1.447 + // height = mCompositionBounds.y / mResolution.scale }
1.448 + // Be within |mScrollableRect|.
1.449 + //
1.450 + // This is valid for any layer, but is always relative to this frame and
1.451 + // not any parents, regardless of parent transforms.
1.452 + CSSPoint mScrollOffset;
1.453 +
1.454 + // The "user zoom". Content is painted by gecko at mResolution * mDevPixelsPerCSSPixel,
1.455 + // but will be drawn to the screen at mZoom. In the steady state, the
1.456 + // two will be the same, but during an async zoom action the two may
1.457 + // diverge. This information is initialized in Gecko but updated in the APZC.
1.458 + CSSToScreenScale mZoom;
1.459 +
1.460 + // Whether mScrollOffset was updated by something other than the APZ code, and
1.461 + // if the APZC receiving this metrics should update its local copy.
1.462 + bool mUpdateScrollOffset;
1.463 + // The scroll generation counter used to acknowledge the scroll offset update.
1.464 + uint32_t mScrollGeneration;
1.465 +
1.466 + // A description of the content element corresponding to this frame.
1.467 + // This is empty unless the apz.printtree pref is turned on.
1.468 + std::string mContentDescription;
1.469 +
1.470 + // The size of the root scrollable's composition bounds, but in local CSS pixels.
1.471 + CSSSize mRootCompositionSize;
1.472 +
1.473 + // A display port expressed as layer margins that apply to the rect of what
1.474 + // is drawn of the scrollable element.
1.475 + LayerMargin mDisplayPortMargins;
1.476 +
1.477 + // If this is true then we use the display port margins on this metrics,
1.478 + // otherwise use the display port rect.
1.479 + bool mUseDisplayPortMargins;
1.480 +};
1.481 +
1.482 +/**
1.483 + * This class allows us to uniquely identify a scrollable layer. The
1.484 + * mLayersId identifies the layer tree (corresponding to a child process
1.485 + * and/or tab) that the scrollable layer belongs to. The mPresShellId
1.486 + * is a temporal identifier (corresponding to the document loaded that
1.487 + * contains the scrollable layer, which may change over time). The
1.488 + * mScrollId corresponds to the actual frame that is scrollable.
1.489 + */
1.490 +struct ScrollableLayerGuid {
1.491 + uint64_t mLayersId;
1.492 + uint32_t mPresShellId;
1.493 + FrameMetrics::ViewID mScrollId;
1.494 +
1.495 + ScrollableLayerGuid()
1.496 + : mLayersId(0)
1.497 + , mPresShellId(0)
1.498 + , mScrollId(0)
1.499 + {
1.500 + MOZ_COUNT_CTOR(ScrollableLayerGuid);
1.501 + }
1.502 +
1.503 + ScrollableLayerGuid(uint64_t aLayersId, uint32_t aPresShellId,
1.504 + FrameMetrics::ViewID aScrollId)
1.505 + : mLayersId(aLayersId)
1.506 + , mPresShellId(aPresShellId)
1.507 + , mScrollId(aScrollId)
1.508 + {
1.509 + MOZ_COUNT_CTOR(ScrollableLayerGuid);
1.510 + }
1.511 +
1.512 + ScrollableLayerGuid(uint64_t aLayersId, const FrameMetrics& aMetrics)
1.513 + : mLayersId(aLayersId)
1.514 + , mPresShellId(aMetrics.mPresShellId)
1.515 + , mScrollId(aMetrics.GetScrollId())
1.516 + {
1.517 + MOZ_COUNT_CTOR(ScrollableLayerGuid);
1.518 + }
1.519 +
1.520 + ~ScrollableLayerGuid()
1.521 + {
1.522 + MOZ_COUNT_DTOR(ScrollableLayerGuid);
1.523 + }
1.524 +
1.525 + bool operator==(const ScrollableLayerGuid& other) const
1.526 + {
1.527 + return mLayersId == other.mLayersId
1.528 + && mPresShellId == other.mPresShellId
1.529 + && mScrollId == other.mScrollId;
1.530 + }
1.531 +
1.532 + bool operator!=(const ScrollableLayerGuid& other) const
1.533 + {
1.534 + return !(*this == other);
1.535 + }
1.536 +};
1.537 +
1.538 +template <int LogLevel>
1.539 +gfx::Log<LogLevel>& operator<<(gfx::Log<LogLevel>& log, const ScrollableLayerGuid& aGuid) {
1.540 + return log << '(' << aGuid.mLayersId << ',' << aGuid.mPresShellId << ',' << aGuid.mScrollId << ')';
1.541 +}
1.542 +
1.543 +struct ZoomConstraints {
1.544 + bool mAllowZoom;
1.545 + bool mAllowDoubleTapZoom;
1.546 + CSSToScreenScale mMinZoom;
1.547 + CSSToScreenScale mMaxZoom;
1.548 +
1.549 + ZoomConstraints()
1.550 + : mAllowZoom(true)
1.551 + , mAllowDoubleTapZoom(true)
1.552 + {
1.553 + MOZ_COUNT_CTOR(ZoomConstraints);
1.554 + }
1.555 +
1.556 + ZoomConstraints(bool aAllowZoom,
1.557 + bool aAllowDoubleTapZoom,
1.558 + const CSSToScreenScale& aMinZoom,
1.559 + const CSSToScreenScale& aMaxZoom)
1.560 + : mAllowZoom(aAllowZoom)
1.561 + , mAllowDoubleTapZoom(aAllowDoubleTapZoom)
1.562 + , mMinZoom(aMinZoom)
1.563 + , mMaxZoom(aMaxZoom)
1.564 + {
1.565 + MOZ_COUNT_CTOR(ZoomConstraints);
1.566 + }
1.567 +
1.568 + ~ZoomConstraints()
1.569 + {
1.570 + MOZ_COUNT_DTOR(ZoomConstraints);
1.571 + }
1.572 +
1.573 + bool operator==(const ZoomConstraints& other) const
1.574 + {
1.575 + return mAllowZoom == other.mAllowZoom
1.576 + && mAllowDoubleTapZoom == other.mAllowDoubleTapZoom
1.577 + && mMinZoom == other.mMinZoom
1.578 + && mMaxZoom == other.mMaxZoom;
1.579 + }
1.580 +
1.581 + bool operator!=(const ZoomConstraints& other) const
1.582 + {
1.583 + return !(*this == other);
1.584 + }
1.585 +};
1.586 +
1.587 +}
1.588 +}
1.589 +
1.590 +#endif /* GFX_FRAMEMETRICS_H */
