1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/layout/svg/nsSVGMaskFrame.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,320 @@
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 +// Main header first:
1.10 +#include "nsSVGMaskFrame.h"
1.11 +
1.12 +// Keep others in (case-insensitive) order:
1.13 +#include "gfxContext.h"
1.14 +#include "gfxImageSurface.h"
1.15 +#include "nsRenderingContext.h"
1.16 +#include "nsSVGEffects.h"
1.17 +#include "mozilla/dom/SVGMaskElement.h"
1.18 +
1.19 +using namespace mozilla::dom;
1.20 +
1.21 +/**
1.22 + * Byte offsets of channels in a native packed gfxColor or cairo image surface.
1.23 + */
1.24 +#ifdef IS_BIG_ENDIAN
1.25 +#define GFX_ARGB32_OFFSET_A 0
1.26 +#define GFX_ARGB32_OFFSET_R 1
1.27 +#define GFX_ARGB32_OFFSET_G 2
1.28 +#define GFX_ARGB32_OFFSET_B 3
1.29 +#else
1.30 +#define GFX_ARGB32_OFFSET_A 3
1.31 +#define GFX_ARGB32_OFFSET_R 2
1.32 +#define GFX_ARGB32_OFFSET_G 1
1.33 +#define GFX_ARGB32_OFFSET_B 0
1.34 +#endif
1.35 +
1.36 +// c = n / 255
1.37 +// c <= 0.04045 ? c / 12.92 : pow((c + 0.055) / 1.055, 2.4)) * 255 + 0.5
1.38 +static const uint8_t gsRGBToLinearRGBMap[256] = {
1.39 + 0, 0, 0, 0, 0, 0, 0, 1,
1.40 + 1, 1, 1, 1, 1, 1, 1, 1,
1.41 + 1, 1, 2, 2, 2, 2, 2, 2,
1.42 + 2, 2, 3, 3, 3, 3, 3, 3,
1.43 + 4, 4, 4, 4, 4, 5, 5, 5,
1.44 + 5, 6, 6, 6, 6, 7, 7, 7,
1.45 + 8, 8, 8, 8, 9, 9, 9, 10,
1.46 + 10, 10, 11, 11, 12, 12, 12, 13,
1.47 + 13, 13, 14, 14, 15, 15, 16, 16,
1.48 + 17, 17, 17, 18, 18, 19, 19, 20,
1.49 + 20, 21, 22, 22, 23, 23, 24, 24,
1.50 + 25, 25, 26, 27, 27, 28, 29, 29,
1.51 + 30, 30, 31, 32, 32, 33, 34, 35,
1.52 + 35, 36, 37, 37, 38, 39, 40, 41,
1.53 + 41, 42, 43, 44, 45, 45, 46, 47,
1.54 + 48, 49, 50, 51, 51, 52, 53, 54,
1.55 + 55, 56, 57, 58, 59, 60, 61, 62,
1.56 + 63, 64, 65, 66, 67, 68, 69, 70,
1.57 + 71, 72, 73, 74, 76, 77, 78, 79,
1.58 + 80, 81, 82, 84, 85, 86, 87, 88,
1.59 + 90, 91, 92, 93, 95, 96, 97, 99,
1.60 +100, 101, 103, 104, 105, 107, 108, 109,
1.61 +111, 112, 114, 115, 116, 118, 119, 121,
1.62 +122, 124, 125, 127, 128, 130, 131, 133,
1.63 +134, 136, 138, 139, 141, 142, 144, 146,
1.64 +147, 149, 151, 152, 154, 156, 157, 159,
1.65 +161, 163, 164, 166, 168, 170, 171, 173,
1.66 +175, 177, 179, 181, 183, 184, 186, 188,
1.67 +190, 192, 194, 196, 198, 200, 202, 204,
1.68 +206, 208, 210, 212, 214, 216, 218, 220,
1.69 +222, 224, 226, 229, 231, 233, 235, 237,
1.70 +239, 242, 244, 246, 248, 250, 253, 255
1.71 +};
1.72 +
1.73 +static void
1.74 +ComputesRGBLuminanceMask(uint8_t *aData,
1.75 + int32_t aStride,
1.76 + const nsIntRect &aRect,
1.77 + float aOpacity)
1.78 +{
1.79 + for (int32_t y = aRect.y; y < aRect.YMost(); y++) {
1.80 + for (int32_t x = aRect.x; x < aRect.XMost(); x++) {
1.81 + uint8_t *pixel = aData + aStride * y + 4 * x;
1.82 + uint8_t a = pixel[GFX_ARGB32_OFFSET_A];
1.83 +
1.84 + uint8_t luminance;
1.85 + if (a) {
1.86 + /* sRGB -> intensity (unpremultiply cancels out the
1.87 + * (a/255.0) multiplication with aOpacity */
1.88 + luminance =
1.89 + static_cast<uint8_t>
1.90 + ((pixel[GFX_ARGB32_OFFSET_R] * 0.2125 +
1.91 + pixel[GFX_ARGB32_OFFSET_G] * 0.7154 +
1.92 + pixel[GFX_ARGB32_OFFSET_B] * 0.0721) *
1.93 + aOpacity);
1.94 + } else {
1.95 + luminance = 0;
1.96 + }
1.97 + memset(pixel, luminance, 4);
1.98 + }
1.99 + }
1.100 +}
1.101 +
1.102 +static void
1.103 +ComputeLinearRGBLuminanceMask(uint8_t *aData,
1.104 + int32_t aStride,
1.105 + const nsIntRect &aRect,
1.106 + float aOpacity)
1.107 +{
1.108 + for (int32_t y = aRect.y; y < aRect.YMost(); y++) {
1.109 + for (int32_t x = aRect.x; x < aRect.XMost(); x++) {
1.110 + uint8_t *pixel = aData + aStride * y + 4 * x;
1.111 + uint8_t a = pixel[GFX_ARGB32_OFFSET_A];
1.112 +
1.113 + uint8_t luminance;
1.114 + // unpremultiply
1.115 + if (a) {
1.116 + if (a != 255) {
1.117 + pixel[GFX_ARGB32_OFFSET_B] =
1.118 + (255 * pixel[GFX_ARGB32_OFFSET_B]) / a;
1.119 + pixel[GFX_ARGB32_OFFSET_G] =
1.120 + (255 * pixel[GFX_ARGB32_OFFSET_G]) / a;
1.121 + pixel[GFX_ARGB32_OFFSET_R] =
1.122 + (255 * pixel[GFX_ARGB32_OFFSET_R]) / a;
1.123 + }
1.124 +
1.125 + /* sRGB -> linearRGB -> intensity */
1.126 + luminance =
1.127 + static_cast<uint8_t>
1.128 + ((gsRGBToLinearRGBMap[pixel[GFX_ARGB32_OFFSET_R]] *
1.129 + 0.2125 +
1.130 + gsRGBToLinearRGBMap[pixel[GFX_ARGB32_OFFSET_G]] *
1.131 + 0.7154 +
1.132 + gsRGBToLinearRGBMap[pixel[GFX_ARGB32_OFFSET_B]] *
1.133 + 0.0721) * (a / 255.0) * aOpacity);
1.134 + } else {
1.135 + luminance = 0;
1.136 + }
1.137 + memset(pixel, luminance, 4);
1.138 + }
1.139 + }
1.140 +}
1.141 +
1.142 +static void
1.143 +ComputeAlphaMask(uint8_t *aData,
1.144 + int32_t aStride,
1.145 + const nsIntRect &aRect,
1.146 + float aOpacity)
1.147 +{
1.148 + for (int32_t y = aRect.y; y < aRect.YMost(); y++) {
1.149 + for (int32_t x = aRect.x; x < aRect.XMost(); x++) {
1.150 + uint8_t *pixel = aData + aStride * y + 4 * x;
1.151 + uint8_t luminance = pixel[GFX_ARGB32_OFFSET_A] * aOpacity;
1.152 + memset(pixel, luminance, 4);
1.153 + }
1.154 + }
1.155 +}
1.156 +
1.157 +//----------------------------------------------------------------------
1.158 +// Implementation
1.159 +
1.160 +nsIFrame*
1.161 +NS_NewSVGMaskFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
1.162 +{
1.163 + return new (aPresShell) nsSVGMaskFrame(aContext);
1.164 +}
1.165 +
1.166 +NS_IMPL_FRAMEARENA_HELPERS(nsSVGMaskFrame)
1.167 +
1.168 +already_AddRefed<gfxPattern>
1.169 +nsSVGMaskFrame::ComputeMaskAlpha(nsRenderingContext *aContext,
1.170 + nsIFrame* aParent,
1.171 + const gfxMatrix &aMatrix,
1.172 + float aOpacity)
1.173 +{
1.174 + // If the flag is set when we get here, it means this mask frame
1.175 + // has already been used painting the current mask, and the document
1.176 + // has a mask reference loop.
1.177 + if (mInUse) {
1.178 + NS_WARNING("Mask loop detected!");
1.179 + return nullptr;
1.180 + }
1.181 + AutoMaskReferencer maskRef(this);
1.182 +
1.183 + SVGMaskElement *mask = static_cast<SVGMaskElement*>(mContent);
1.184 +
1.185 + uint16_t units =
1.186 + mask->mEnumAttributes[SVGMaskElement::MASKUNITS].GetAnimValue();
1.187 + gfxRect bbox;
1.188 + if (units == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
1.189 + bbox = nsSVGUtils::GetBBox(aParent);
1.190 + }
1.191 +
1.192 + gfxRect maskArea = nsSVGUtils::GetRelativeRect(units,
1.193 + &mask->mLengthAttributes[SVGMaskElement::ATTR_X], bbox, aParent);
1.194 +
1.195 + gfxContext *gfx = aContext->ThebesContext();
1.196 +
1.197 + // Get the clip extents in device space:
1.198 + gfx->Save();
1.199 + nsSVGUtils::SetClipRect(gfx, aMatrix, maskArea);
1.200 + gfx->IdentityMatrix();
1.201 + gfxRect clipExtents = gfx->GetClipExtents();
1.202 + clipExtents.RoundOut();
1.203 + gfx->Restore();
1.204 +
1.205 + bool resultOverflows;
1.206 + gfxIntSize surfaceSize =
1.207 + nsSVGUtils::ConvertToSurfaceSize(gfxSize(clipExtents.Width(),
1.208 + clipExtents.Height()),
1.209 + &resultOverflows);
1.210 +
1.211 + // 0 disables mask, < 0 is an error
1.212 + if (surfaceSize.width <= 0 || surfaceSize.height <= 0)
1.213 + return nullptr;
1.214 +
1.215 + if (resultOverflows)
1.216 + return nullptr;
1.217 +
1.218 + nsRefPtr<gfxImageSurface> image =
1.219 + new gfxImageSurface(surfaceSize, gfxImageFormat::ARGB32);
1.220 + if (!image || image->CairoStatus())
1.221 + return nullptr;
1.222 +
1.223 + // We would like to use gfxImageSurface::SetDeviceOffset() to position
1.224 + // 'image'. However, we need to set the same matrix on the temporary context
1.225 + // and pattern that we create below as is currently set on 'gfx'.
1.226 + // Unfortunately, any device offset set by SetDeviceOffset() is affected by
1.227 + // the transform passed to the SetMatrix() calls, so to avoid that we account
1.228 + // for the device offset in the transform rather than use SetDeviceOffset().
1.229 + gfxMatrix matrix =
1.230 + gfx->CurrentMatrix() * gfxMatrix().Translate(-clipExtents.TopLeft());
1.231 +
1.232 + nsRefPtr<nsRenderingContext> tmpCtx(new nsRenderingContext);
1.233 + tmpCtx->Init(this->PresContext()->DeviceContext(), image);
1.234 + tmpCtx->ThebesContext()->SetMatrix(matrix);
1.235 +
1.236 + mMaskParent = aParent;
1.237 + if (mMaskParentMatrix) {
1.238 + *mMaskParentMatrix = aMatrix;
1.239 + } else {
1.240 + mMaskParentMatrix = new gfxMatrix(aMatrix);
1.241 + }
1.242 +
1.243 + for (nsIFrame* kid = mFrames.FirstChild(); kid;
1.244 + kid = kid->GetNextSibling()) {
1.245 + // The CTM of each frame referencing us can be different
1.246 + nsISVGChildFrame* SVGFrame = do_QueryFrame(kid);
1.247 + if (SVGFrame) {
1.248 + SVGFrame->NotifySVGChanged(nsISVGChildFrame::TRANSFORM_CHANGED);
1.249 + }
1.250 + nsSVGUtils::PaintFrameWithEffects(tmpCtx, nullptr, kid);
1.251 + }
1.252 +
1.253 + uint8_t *data = image->Data();
1.254 + int32_t stride = image->Stride();
1.255 + nsIntRect rect(0, 0, surfaceSize.width, surfaceSize.height);
1.256 +
1.257 + if (StyleSVGReset()->mMaskType == NS_STYLE_MASK_TYPE_LUMINANCE) {
1.258 + if (StyleSVG()->mColorInterpolation ==
1.259 + NS_STYLE_COLOR_INTERPOLATION_LINEARRGB) {
1.260 + ComputeLinearRGBLuminanceMask(data, stride, rect, aOpacity);
1.261 + } else {
1.262 + ComputesRGBLuminanceMask(data, stride, rect, aOpacity);
1.263 + }
1.264 + } else {
1.265 + ComputeAlphaMask(data, stride, rect, aOpacity);
1.266 + }
1.267 +
1.268 + nsRefPtr<gfxPattern> retval = new gfxPattern(image);
1.269 + retval->SetMatrix(matrix);
1.270 + return retval.forget();
1.271 +}
1.272 +
1.273 +nsresult
1.274 +nsSVGMaskFrame::AttributeChanged(int32_t aNameSpaceID,
1.275 + nsIAtom* aAttribute,
1.276 + int32_t aModType)
1.277 +{
1.278 + if (aNameSpaceID == kNameSpaceID_None &&
1.279 + (aAttribute == nsGkAtoms::x ||
1.280 + aAttribute == nsGkAtoms::y ||
1.281 + aAttribute == nsGkAtoms::width ||
1.282 + aAttribute == nsGkAtoms::height||
1.283 + aAttribute == nsGkAtoms::maskUnits ||
1.284 + aAttribute == nsGkAtoms::maskContentUnits)) {
1.285 + nsSVGEffects::InvalidateDirectRenderingObservers(this);
1.286 + }
1.287 +
1.288 + return nsSVGMaskFrameBase::AttributeChanged(aNameSpaceID,
1.289 + aAttribute, aModType);
1.290 +}
1.291 +
1.292 +#ifdef DEBUG
1.293 +void
1.294 +nsSVGMaskFrame::Init(nsIContent* aContent,
1.295 + nsIFrame* aParent,
1.296 + nsIFrame* aPrevInFlow)
1.297 +{
1.298 + NS_ASSERTION(aContent->IsSVG(nsGkAtoms::mask),
1.299 + "Content is not an SVG mask");
1.300 +
1.301 + nsSVGMaskFrameBase::Init(aContent, aParent, aPrevInFlow);
1.302 +}
1.303 +#endif /* DEBUG */
1.304 +
1.305 +nsIAtom *
1.306 +nsSVGMaskFrame::GetType() const
1.307 +{
1.308 + return nsGkAtoms::svgMaskFrame;
1.309 +}
1.310 +
1.311 +gfxMatrix
1.312 +nsSVGMaskFrame::GetCanvasTM(uint32_t aFor, nsIFrame* aTransformRoot)
1.313 +{
1.314 + NS_ASSERTION(mMaskParentMatrix, "null parent matrix");
1.315 +
1.316 + SVGMaskElement *mask = static_cast<SVGMaskElement*>(mContent);
1.317 +
1.318 + return nsSVGUtils::AdjustMatrixForUnits(
1.319 + mMaskParentMatrix ? *mMaskParentMatrix : gfxMatrix(),
1.320 + &mask->mEnumAttributes[SVGMaskElement::MASKCONTENTUNITS],
1.321 + mMaskParent);
1.322 +}
1.323 +
