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gecko-dev/gfx/2d/DrawTargetSkia.cpp
Lee Salzman a9a5f8d155 Bug 1911019 - Use different anti-aliasing approximation for subpixel rectangles. r=aosmond a=RyanVM 
The previous attempt at refining the subpixel anti-aliasing approximation modified the
distance-to-edge tracking, which can cause the AA to approach zero too soon.

This fixes this by reverting the distance-to-edge tracking back to the way it was, but
instead limiting the alpha to the area of the subpixel rectangle if necessary.

Differential Revision: https://phabricator.services.mozilla.com/D218493
2024-08-04 17:16:32 +00:00

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "DrawTargetSkia.h"
#include "SourceSurfaceSkia.h"
#include "ScaledFontBase.h"
#include "FilterNodeSoftware.h"
#include "HelpersSkia.h"
#include "mozilla/CheckedInt.h"
#include "mozilla/Vector.h"
#include "skia/include/core/SkBitmap.h"
#include "skia/include/core/SkCanvas.h"
#include "skia/include/core/SkFont.h"
#include "skia/include/core/SkSurface.h"
#include "skia/include/core/SkTextBlob.h"
#include "skia/include/core/SkTypeface.h"
#include "skia/include/effects/SkGradientShader.h"
#include "skia/include/core/SkColorFilter.h"
#include "skia/include/core/SkRegion.h"
#include "skia/include/effects/SkImageFilters.h"
#include "skia/include/private/base/SkMalloc.h"
#include "Blur.h"
#include "Logging.h"
#include "Tools.h"
#include "PathHelpers.h"
#include "PathSkia.h"
#include "Swizzle.h"
#include <algorithm>
#include <cmath>
#ifdef MOZ_WIDGET_COCOA
# include "BorrowedContext.h"
# include <ApplicationServices/ApplicationServices.h>
#endif
#ifdef XP_WIN
# include "ScaledFontDWrite.h"
#endif
namespace mozilla {
void RefPtrTraits<SkSurface>::Release(SkSurface* aSurface) {
SkSafeUnref(aSurface);
}
void RefPtrTraits<SkSurface>::AddRef(SkSurface* aSurface) {
SkSafeRef(aSurface);
}
} // namespace mozilla
namespace mozilla::gfx {
class GradientStopsSkia : public GradientStops {
public:
MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(GradientStopsSkia, override)
GradientStopsSkia(const std::vector<GradientStop>& aStops, uint32_t aNumStops,
ExtendMode aExtendMode)
: mCount(aNumStops), mExtendMode(aExtendMode) {
if (mCount == 0) {
return;
}
// Skia gradients always require a stop at 0.0 and 1.0, insert these if
// we don't have them.
uint32_t shift = 0;
if (aStops[0].offset != 0) {
mCount++;
shift = 1;
}
if (aStops[aNumStops - 1].offset != 1) {
mCount++;
}
mColors.resize(mCount);
mPositions.resize(mCount);
if (aStops[0].offset != 0) {
mColors[0] = ColorToSkColor(aStops[0].color, 1.0);
mPositions[0] = 0;
}
for (uint32_t i = 0; i < aNumStops; i++) {
mColors[i + shift] = ColorToSkColor(aStops[i].color, 1.0);
mPositions[i + shift] = SkFloatToScalar(aStops[i].offset);
}
if (aStops[aNumStops - 1].offset != 1) {
mColors[mCount - 1] = ColorToSkColor(aStops[aNumStops - 1].color, 1.0);
mPositions[mCount - 1] = SK_Scalar1;
}
}
BackendType GetBackendType() const override { return BackendType::SKIA; }
std::vector<SkColor> mColors;
std::vector<SkScalar> mPositions;
int mCount;
ExtendMode mExtendMode;
};
/**
* When constructing a temporary SkImage via GetSkImageForSurface, we may also
* have to construct a temporary DataSourceSurface, which must live as long as
* the SkImage. We attach this temporary surface to the image's pixelref, so
* that it can be released once the pixelref is freed.
*/
static void ReleaseTemporarySurface(const void* aPixels, void* aContext) {
DataSourceSurface* surf = static_cast<DataSourceSurface*>(aContext);
if (surf) {
surf->Release();
}
}
static void ReleaseTemporaryMappedSurface(const void* aPixels, void* aContext) {
DataSourceSurface* surf = static_cast<DataSourceSurface*>(aContext);
if (surf) {
surf->Unmap();
surf->Release();
}
}
static void WriteRGBXFormat(uint8_t* aData, const IntSize& aSize,
const int32_t aStride, SurfaceFormat aFormat) {
if (aFormat != SurfaceFormat::B8G8R8X8 || aSize.IsEmpty()) {
return;
}
SwizzleData(aData, aStride, SurfaceFormat::X8R8G8B8_UINT32, aData, aStride,
SurfaceFormat::A8R8G8B8_UINT32, aSize);
}
#ifdef DEBUG
static IntRect CalculateSurfaceBounds(const IntSize& aSize, const Rect* aBounds,
const Matrix* aMatrix) {
IntRect surfaceBounds(IntPoint(0, 0), aSize);
if (!aBounds) {
return surfaceBounds;
}
MOZ_ASSERT(aMatrix);
Matrix inverse(*aMatrix);
if (!inverse.Invert()) {
return surfaceBounds;
}
IntRect bounds;
Rect sampledBounds = inverse.TransformBounds(*aBounds);
if (!sampledBounds.ToIntRect(&bounds)) {
return surfaceBounds;
}
return surfaceBounds.Intersect(bounds);
}
static const int kARGBAlphaOffset =
SurfaceFormat::A8R8G8B8_UINT32 == SurfaceFormat::B8G8R8A8 ? 3 : 0;
static bool VerifyRGBXFormat(uint8_t* aData, const IntSize& aSize,
const int32_t aStride, SurfaceFormat aFormat) {
if (aFormat != SurfaceFormat::B8G8R8X8 || aSize.IsEmpty()) {
return true;
}
// We should've initialized the data to be opaque already
// On debug builds, verify that this is actually true.
int height = aSize.height;
int width = aSize.width * 4;
for (int row = 0; row < height; ++row) {
for (int column = 0; column < width; column += 4) {
if (aData[column + kARGBAlphaOffset] != 0xFF) {
gfxCriticalError() << "RGBX pixel at (" << column << "," << row
<< ") in " << width << "x" << height
<< " surface is not opaque: " << int(aData[column])
<< "," << int(aData[column + 1]) << ","
<< int(aData[column + 2]) << ","
<< int(aData[column + 3]);
}
}
aData += aStride;
}
return true;
}
// Since checking every pixel is expensive, this only checks the four corners
// and center of a surface that their alpha value is 0xFF.
static bool VerifyRGBXCorners(uint8_t* aData, const IntSize& aSize,
const int32_t aStride, SurfaceFormat aFormat,
const Rect* aBounds = nullptr,
const Matrix* aMatrix = nullptr) {
if (aFormat != SurfaceFormat::B8G8R8X8 || aSize.IsEmpty()) {
return true;
}
IntRect bounds = CalculateSurfaceBounds(aSize, aBounds, aMatrix);
if (bounds.IsEmpty()) {
return true;
}
const int height = bounds.Height();
const int width = bounds.Width();
const int pixelSize = 4;
MOZ_ASSERT(aSize.width * pixelSize <= aStride);
const int translation = bounds.Y() * aStride + bounds.X() * pixelSize;
const int topLeft = translation;
const int topRight = topLeft + (width - 1) * pixelSize;
const int bottomLeft = translation + (height - 1) * aStride;
const int bottomRight = bottomLeft + (width - 1) * pixelSize;
// Lastly the center pixel
const int middleRowHeight = height / 2;
const int middleRowWidth = (width / 2) * pixelSize;
const int middle = translation + aStride * middleRowHeight + middleRowWidth;
const int offsets[] = {topLeft, topRight, bottomRight, bottomLeft, middle};
for (int offset : offsets) {
if (aData[offset + kARGBAlphaOffset] != 0xFF) {
int row = offset / aStride;
int column = (offset % aStride) / pixelSize;
gfxCriticalError() << "RGBX corner pixel at (" << column << "," << row
<< ") in " << aSize.width << "x" << aSize.height
<< " surface, bounded by "
<< "(" << bounds.X() << "," << bounds.Y() << ","
<< width << "," << height
<< ") is not opaque: " << int(aData[offset]) << ","
<< int(aData[offset + 1]) << ","
<< int(aData[offset + 2]) << ","
<< int(aData[offset + 3]);
}
}
return true;
}
#endif
static sk_sp<SkImage> GetSkImageForSurface(SourceSurface* aSurface,
Maybe<MutexAutoLock>* aLock,
const Rect* aBounds = nullptr,
const Matrix* aMatrix = nullptr) {
if (!aSurface) {
gfxDebug() << "Creating null Skia image from null SourceSurface";
return nullptr;
}
if (aSurface->GetType() == SurfaceType::SKIA) {
return static_cast<SourceSurfaceSkia*>(aSurface)->GetImage(aLock);
}
RefPtr<DataSourceSurface> dataSurface = aSurface->GetDataSurface();
if (!dataSurface) {
gfxWarning() << "Failed getting DataSourceSurface for Skia image";
return nullptr;
}
DataSourceSurface::MappedSurface map;
void (*releaseProc)(const void*, void*);
if (dataSurface->GetType() == SurfaceType::DATA_SHARED_WRAPPER) {
// Technically all surfaces should be mapped and unmapped explicitly but it
// appears SourceSurfaceSkia and DataSourceSurfaceWrapper have issues with
// this. For now, we just map SourceSurfaceSharedDataWrapper to ensure we
// don't unmap the data during the transaction (for blob images).
if (!dataSurface->Map(DataSourceSurface::MapType::READ, &map)) {
gfxWarning() << "Failed mapping DataSourceSurface for Skia image";
return nullptr;
}
releaseProc = ReleaseTemporaryMappedSurface;
} else {
map.mData = dataSurface->GetData();
map.mStride = dataSurface->Stride();
releaseProc = ReleaseTemporarySurface;
}
DataSourceSurface* surf = dataSurface.forget().take();
// Skia doesn't support RGBX surfaces so ensure that the alpha value is opaque
// white.
MOZ_ASSERT(VerifyRGBXCorners(map.mData, surf->GetSize(), map.mStride,
surf->GetFormat(), aBounds, aMatrix));
SkPixmap pixmap(MakeSkiaImageInfo(surf->GetSize(), surf->GetFormat()),
map.mData, map.mStride);
sk_sp<SkImage> image = SkImages::RasterFromPixmap(pixmap, releaseProc, surf);
if (!image) {
releaseProc(map.mData, surf);
gfxDebug() << "Failed making Skia raster image for temporary surface";
}
return image;
}
DrawTargetSkia::DrawTargetSkia()
: mCanvas(nullptr),
mSnapshot(nullptr),
mSnapshotLock{"DrawTargetSkia::mSnapshotLock"}
#ifdef MOZ_WIDGET_COCOA
,
mCG(nullptr),
mColorSpace(nullptr),
mCanvasData(nullptr),
mCGSize(0, 0),
mNeedLayer(false)
#endif
{
}
DrawTargetSkia::~DrawTargetSkia() {
if (mSnapshot) {
MutexAutoLock lock(mSnapshotLock);
// We're going to go away, hand our SkSurface to the SourceSurface.
mSnapshot->GiveSurface(mSurface.forget().take());
}
#ifdef MOZ_WIDGET_COCOA
if (mCG) {
CGContextRelease(mCG);
mCG = nullptr;
}
if (mColorSpace) {
CGColorSpaceRelease(mColorSpace);
mColorSpace = nullptr;
}
#endif
}
already_AddRefed<SourceSurface> DrawTargetSkia::Snapshot(
SurfaceFormat aFormat) {
// Without this lock, this could cause us to get out a snapshot and race with
// Snapshot::~Snapshot() actually destroying itself.
MutexAutoLock lock(mSnapshotLock);
if (mSnapshot && aFormat != mSnapshot->GetFormat()) {
if (!mSnapshot->hasOneRef()) {
mSnapshot->DrawTargetWillChange();
}
mSnapshot = nullptr;
}
RefPtr<SourceSurfaceSkia> snapshot = mSnapshot;
if (mSurface && !snapshot) {
snapshot = new SourceSurfaceSkia();
sk_sp<SkImage> image;
// If the surface is raster, making a snapshot may trigger a pixel copy.
// Instead, try to directly make a raster image referencing the surface
// pixels.
SkPixmap pixmap;
if (mSurface->peekPixels(&pixmap)) {
image = SkImages::RasterFromPixmap(pixmap, nullptr, nullptr);
} else {
image = mSurface->makeImageSnapshot();
}
if (!snapshot->InitFromImage(image, aFormat, this)) {
return nullptr;
}
mSnapshot = snapshot;
}
return snapshot.forget();
}
already_AddRefed<SourceSurface> DrawTargetSkia::GetBackingSurface() {
if (mBackingSurface) {
RefPtr<SourceSurface> snapshot = mBackingSurface;
return snapshot.forget();
}
return Snapshot();
}
bool DrawTargetSkia::LockBits(uint8_t** aData, IntSize* aSize, int32_t* aStride,
SurfaceFormat* aFormat, IntPoint* aOrigin) {
SkImageInfo info;
size_t rowBytes;
SkIPoint origin;
void* pixels = mCanvas->accessTopLayerPixels(&info, &rowBytes, &origin);
if (!pixels ||
// Ensure the layer is at the origin if required.
(!aOrigin && !origin.isZero())) {
return false;
}
MarkChanged();
*aData = reinterpret_cast<uint8_t*>(pixels);
*aSize = IntSize(info.width(), info.height());
*aStride = int32_t(rowBytes);
*aFormat = SkiaColorTypeToGfxFormat(info.colorType(), info.alphaType());
if (aOrigin) {
*aOrigin = IntPoint(origin.x(), origin.y());
}
return true;
}
void DrawTargetSkia::ReleaseBits(uint8_t* aData) {}
static void ReleaseImage(const void* aPixels, void* aContext) {
SkImage* image = static_cast<SkImage*>(aContext);
SkSafeUnref(image);
}
static sk_sp<SkImage> ExtractSubset(sk_sp<SkImage> aImage,
const IntRect& aRect) {
SkIRect subsetRect = IntRectToSkIRect(aRect);
if (aImage->bounds() == subsetRect) {
return aImage;
}
// makeSubset is slow, so prefer to use SkPixmap::extractSubset where
// possible.
SkPixmap pixmap, subsetPixmap;
if (aImage->peekPixels(&pixmap) &&
pixmap.extractSubset(&subsetPixmap, subsetRect)) {
// Release the original image reference so only the subset image keeps it
// alive.
return SkImages::RasterFromPixmap(subsetPixmap, ReleaseImage,
aImage.release());
}
return aImage->makeSubset(nullptr, subsetRect);
}
static void FreeAlphaPixels(void* aBuf, void*) { sk_free(aBuf); }
static bool ExtractAlphaBitmap(const sk_sp<SkImage>& aImage,
SkBitmap* aResultBitmap,
bool aAllowReuse = false) {
SkPixmap pixmap;
if (aAllowReuse && aImage->isAlphaOnly() && aImage->peekPixels(&pixmap)) {
SkBitmap bitmap;
bitmap.installPixels(pixmap.info(), pixmap.writable_addr(),
pixmap.rowBytes());
*aResultBitmap = bitmap;
return true;
}
SkImageInfo info = SkImageInfo::MakeA8(aImage->width(), aImage->height());
// Skia does not fully allocate the last row according to stride.
// Since some of our algorithms (i.e. blur) depend on this, we must allocate
// the bitmap pixels manually.
size_t stride = GetAlignedStride<4>(info.width(), info.bytesPerPixel());
if (stride) {
CheckedInt<size_t> size = stride;
size *= info.height();
// We need to leave room for an additional 3 bytes for a potential overrun
// in our blurring code.
size += 3;
if (size.isValid()) {
void* buf = sk_malloc_flags(size.value(), 0);
if (buf) {
SkBitmap bitmap;
if (bitmap.installPixels(info, buf, stride, FreeAlphaPixels, nullptr) &&
aImage->readPixels(bitmap.info(), bitmap.getPixels(),
bitmap.rowBytes(), 0, 0)) {
*aResultBitmap = bitmap;
return true;
}
}
}
}
gfxWarning() << "Failed reading alpha pixels for Skia bitmap";
return false;
}
static void SetPaintPattern(SkPaint& aPaint, const Pattern& aPattern,
Maybe<MutexAutoLock>& aLock, Float aAlpha = 1.0,
const SkMatrix* aMatrix = nullptr,
const Rect* aBounds = nullptr) {
switch (aPattern.GetType()) {
case PatternType::COLOR: {
DeviceColor color = static_cast<const ColorPattern&>(aPattern).mColor;
aPaint.setColor(ColorToSkColor(color, aAlpha));
break;
}
case PatternType::LINEAR_GRADIENT: {
const LinearGradientPattern& pat =
static_cast<const LinearGradientPattern&>(aPattern);
GradientStopsSkia* stops =
pat.mStops && pat.mStops->GetBackendType() == BackendType::SKIA
? static_cast<GradientStopsSkia*>(pat.mStops.get())
: nullptr;
if (!stops || stops->mCount < 2 || !pat.mBegin.IsFinite() ||
!pat.mEnd.IsFinite() || pat.mBegin == pat.mEnd) {
aPaint.setColor(SK_ColorTRANSPARENT);
} else {
SkTileMode mode = ExtendModeToTileMode(stops->mExtendMode, Axis::BOTH);
SkPoint points[2];
points[0] = SkPoint::Make(SkFloatToScalar(pat.mBegin.x),
SkFloatToScalar(pat.mBegin.y));
points[1] = SkPoint::Make(SkFloatToScalar(pat.mEnd.x),
SkFloatToScalar(pat.mEnd.y));
SkMatrix mat;
GfxMatrixToSkiaMatrix(pat.mMatrix, mat);
if (aMatrix) {
mat.postConcat(*aMatrix);
}
sk_sp<SkShader> shader = SkGradientShader::MakeLinear(
points, &stops->mColors.front(), &stops->mPositions.front(),
stops->mCount, mode, 0, &mat);
if (shader) {
aPaint.setShader(shader);
} else {
aPaint.setColor(SK_ColorTRANSPARENT);
}
}
break;
}
case PatternType::RADIAL_GRADIENT: {
const RadialGradientPattern& pat =
static_cast<const RadialGradientPattern&>(aPattern);
GradientStopsSkia* stops =
pat.mStops && pat.mStops->GetBackendType() == BackendType::SKIA
? static_cast<GradientStopsSkia*>(pat.mStops.get())
: nullptr;
if (!stops || stops->mCount < 2 || !pat.mCenter1.IsFinite() ||
!std::isfinite(pat.mRadius1) || !pat.mCenter2.IsFinite() ||
!std::isfinite(pat.mRadius2) ||
(pat.mCenter1 == pat.mCenter2 && pat.mRadius1 == pat.mRadius2)) {
aPaint.setColor(SK_ColorTRANSPARENT);
} else {
SkTileMode mode = ExtendModeToTileMode(stops->mExtendMode, Axis::BOTH);
SkPoint points[2];
points[0] = SkPoint::Make(SkFloatToScalar(pat.mCenter1.x),
SkFloatToScalar(pat.mCenter1.y));
points[1] = SkPoint::Make(SkFloatToScalar(pat.mCenter2.x),
SkFloatToScalar(pat.mCenter2.y));
SkMatrix mat;
GfxMatrixToSkiaMatrix(pat.mMatrix, mat);
if (aMatrix) {
mat.postConcat(*aMatrix);
}
sk_sp<SkShader> shader = SkGradientShader::MakeTwoPointConical(
points[0], SkFloatToScalar(pat.mRadius1), points[1],
SkFloatToScalar(pat.mRadius2), &stops->mColors.front(),
&stops->mPositions.front(), stops->mCount, mode, 0, &mat);
if (shader) {
aPaint.setShader(shader);
} else {
aPaint.setColor(SK_ColorTRANSPARENT);
}
}
break;
}
case PatternType::CONIC_GRADIENT: {
const ConicGradientPattern& pat =
static_cast<const ConicGradientPattern&>(aPattern);
GradientStopsSkia* stops =
pat.mStops && pat.mStops->GetBackendType() == BackendType::SKIA
? static_cast<GradientStopsSkia*>(pat.mStops.get())
: nullptr;
if (!stops || stops->mCount < 2 || !pat.mCenter.IsFinite() ||
!std::isfinite(pat.mAngle)) {
aPaint.setColor(SK_ColorTRANSPARENT);
} else {
SkMatrix mat;
GfxMatrixToSkiaMatrix(pat.mMatrix, mat);
if (aMatrix) {
mat.postConcat(*aMatrix);
}
SkScalar cx = SkFloatToScalar(pat.mCenter.x);
SkScalar cy = SkFloatToScalar(pat.mCenter.y);
// Skia's sweep gradient angles are relative to the x-axis, not the
// y-axis.
Float angle = (pat.mAngle * 180.0 / M_PI) - 90.0;
if (angle != 0.0) {
mat.preRotate(angle, cx, cy);
}
SkTileMode mode = ExtendModeToTileMode(stops->mExtendMode, Axis::BOTH);
sk_sp<SkShader> shader = SkGradientShader::MakeSweep(
cx, cy, &stops->mColors.front(), &stops->mPositions.front(),
stops->mCount, mode, 360 * pat.mStartOffset, 360 * pat.mEndOffset,
0, &mat);
if (shader) {
aPaint.setShader(shader);
} else {
aPaint.setColor(SK_ColorTRANSPARENT);
}
}
break;
}
case PatternType::SURFACE: {
const SurfacePattern& pat = static_cast<const SurfacePattern&>(aPattern);
sk_sp<SkImage> image =
GetSkImageForSurface(pat.mSurface, &aLock, aBounds, &pat.mMatrix);
if (!image) {
aPaint.setColor(SK_ColorTRANSPARENT);
break;
}
SkMatrix mat;
GfxMatrixToSkiaMatrix(pat.mMatrix, mat);
if (aMatrix) {
mat.postConcat(*aMatrix);
}
if (!pat.mSamplingRect.IsEmpty()) {
image = ExtractSubset(image, pat.mSamplingRect);
if (!image) {
aPaint.setColor(SK_ColorTRANSPARENT);
break;
}
mat.preTranslate(pat.mSamplingRect.X(), pat.mSamplingRect.Y());
}
SkTileMode xTile = ExtendModeToTileMode(pat.mExtendMode, Axis::X_AXIS);
SkTileMode yTile = ExtendModeToTileMode(pat.mExtendMode, Axis::Y_AXIS);
SkFilterMode filterMode = pat.mSamplingFilter == SamplingFilter::POINT
? SkFilterMode::kNearest
: SkFilterMode::kLinear;
sk_sp<SkShader> shader =
image->makeShader(xTile, yTile, SkSamplingOptions(filterMode), mat);
if (shader) {
aPaint.setShader(shader);
} else {
gfxDebug() << "Failed creating Skia surface shader: x-tile="
<< (int)xTile << " y-tile=" << (int)yTile
<< " matrix=" << (mat.isFinite() ? "finite" : "non-finite");
aPaint.setColor(SK_ColorTRANSPARENT);
}
break;
}
}
}
static inline Rect GetClipBounds(SkCanvas* aCanvas) {
// Use a manually transformed getClipDeviceBounds instead of
// getClipBounds because getClipBounds inflates the the bounds
// by a pixel in each direction to compensate for antialiasing.
SkIRect deviceBounds;
if (!aCanvas->getDeviceClipBounds(&deviceBounds)) {
return Rect();
}
SkMatrix inverseCTM;
if (!aCanvas->getTotalMatrix().invert(&inverseCTM)) {
return Rect();
}
SkRect localBounds;
inverseCTM.mapRect(&localBounds, SkRect::Make(deviceBounds));
return SkRectToRect(localBounds);
}
struct AutoPaintSetup {
AutoPaintSetup(SkCanvas* aCanvas, const DrawOptions& aOptions,
const Pattern& aPattern, const Rect* aMaskBounds = nullptr,
const SkMatrix* aMatrix = nullptr,
const Rect* aSourceBounds = nullptr)
: mNeedsRestore(false), mAlpha(1.0) {
Init(aCanvas, aOptions, aMaskBounds, false);
SetPaintPattern(mPaint, aPattern, mLock, mAlpha, aMatrix, aSourceBounds);
}
AutoPaintSetup(SkCanvas* aCanvas, const DrawOptions& aOptions,
const Rect* aMaskBounds = nullptr, bool aForceGroup = false)
: mNeedsRestore(false), mAlpha(1.0) {
Init(aCanvas, aOptions, aMaskBounds, aForceGroup);
}
~AutoPaintSetup() {
if (mNeedsRestore) {
mCanvas->restore();
}
}
void Init(SkCanvas* aCanvas, const DrawOptions& aOptions,
const Rect* aMaskBounds, bool aForceGroup) {
mPaint.setBlendMode(GfxOpToSkiaOp(aOptions.mCompositionOp));
mCanvas = aCanvas;
// TODO: Can we set greyscale somehow?
if (aOptions.mAntialiasMode != AntialiasMode::NONE) {
mPaint.setAntiAlias(true);
} else {
mPaint.setAntiAlias(false);
}
bool needsGroup =
aForceGroup ||
(!IsOperatorBoundByMask(aOptions.mCompositionOp) &&
(!aMaskBounds || !aMaskBounds->Contains(GetClipBounds(aCanvas))));
// TODO: We could skip the temporary for operator_source and just
// clear the clip rect. The other operators would be harder
// but could be worth it to skip pushing a group.
if (needsGroup) {
mPaint.setBlendMode(SkBlendMode::kSrcOver);
SkPaint temp;
temp.setBlendMode(GfxOpToSkiaOp(aOptions.mCompositionOp));
temp.setAlpha(ColorFloatToByte(aOptions.mAlpha));
// TODO: Get a rect here
SkCanvas::SaveLayerRec rec(nullptr, &temp,
SkCanvas::kPreserveLCDText_SaveLayerFlag);
mCanvas->saveLayer(rec);
mNeedsRestore = true;
} else {
mPaint.setAlpha(ColorFloatToByte(aOptions.mAlpha));
mAlpha = aOptions.mAlpha;
}
}
// TODO: Maybe add an operator overload to access this easier?
SkPaint mPaint;
bool mNeedsRestore;
SkCanvas* mCanvas;
Maybe<MutexAutoLock> mLock;
Float mAlpha;
};
void DrawTargetSkia::Flush() {}
void DrawTargetSkia::DrawSurface(SourceSurface* aSurface, const Rect& aDest,
const Rect& aSource,
const DrawSurfaceOptions& aSurfOptions,
const DrawOptions& aOptions) {
if (aSource.IsEmpty()) {
return;
}
MarkChanged();
Maybe<MutexAutoLock> lock;
sk_sp<SkImage> image = GetSkImageForSurface(aSurface, &lock);
if (!image) {
return;
}
SkRect destRect = RectToSkRect(aDest);
SkRect sourceRect = RectToSkRect(aSource - aSurface->GetRect().TopLeft());
bool forceGroup =
image->isAlphaOnly() && aOptions.mCompositionOp != CompositionOp::OP_OVER;
AutoPaintSetup paint(mCanvas, aOptions, &aDest, forceGroup);
SkFilterMode filterMode =
aSurfOptions.mSamplingFilter == SamplingFilter::POINT
? SkFilterMode::kNearest
: SkFilterMode::kLinear;
mCanvas->drawImageRect(image, sourceRect, destRect,
SkSamplingOptions(filterMode), &paint.mPaint,
SkCanvas::kStrict_SrcRectConstraint);
}
DrawTargetType DrawTargetSkia::GetType() const {
return DrawTargetType::SOFTWARE_RASTER;
}
void DrawTargetSkia::DrawFilter(FilterNode* aNode, const Rect& aSourceRect,
const Point& aDestPoint,
const DrawOptions& aOptions) {
if (!aNode || aNode->GetBackendType() != FILTER_BACKEND_SOFTWARE) {
return;
}
FilterNodeSoftware* filter = static_cast<FilterNodeSoftware*>(aNode);
filter->Draw(this, aSourceRect, aDestPoint, aOptions);
}
void DrawTargetSkia::DrawSurfaceWithShadow(SourceSurface* aSurface,
const Point& aDest,
const ShadowOptions& aShadow,
CompositionOp aOperator) {
if (aSurface->GetSize().IsEmpty()) {
return;
}
MarkChanged();
Maybe<MutexAutoLock> lock;
sk_sp<SkImage> image = GetSkImageForSurface(aSurface, &lock);
if (!image) {
return;
}
mCanvas->save();
mCanvas->resetMatrix();
SkPaint paint;
paint.setBlendMode(GfxOpToSkiaOp(aOperator));
// bug 1201272
// We can't use the SkDropShadowImageFilter here because it applies the xfer
// mode first to render the bitmap to a temporary layer, and then implicitly
// uses src-over to composite the resulting shadow.
// The canvas spec, however, states that the composite op must be used to
// composite the resulting shadow, so we must instead use a SkBlurImageFilter
// to blur the image ourselves.
SkPaint shadowPaint;
shadowPaint.setBlendMode(GfxOpToSkiaOp(aOperator));
auto shadowDest = IntPoint::Round(aDest + aShadow.mOffset);
SkBitmap blurMask;
// Extract the alpha channel of the image into a bitmap. If the image is A8
// format already, then we can directly reuse the bitmap rather than create a
// new one as the surface only needs to be drawn from once.
if (ExtractAlphaBitmap(image, &blurMask, true)) {
// Prefer using our own box blur instead of Skia's. It currently performs
// much better than SkBlurImageFilter or SkBlurMaskFilter on the CPU.
AlphaBoxBlur blur(Rect(0, 0, blurMask.width(), blurMask.height()),
int32_t(blurMask.rowBytes()), aShadow.mSigma,
aShadow.mSigma);
blur.Blur(reinterpret_cast<uint8_t*>(blurMask.getPixels()));
blurMask.notifyPixelsChanged();
shadowPaint.setColor(ColorToSkColor(aShadow.mColor, 1.0f));
mCanvas->drawImage(blurMask.asImage(), shadowDest.x, shadowDest.y,
SkSamplingOptions(SkFilterMode::kLinear), &shadowPaint);
} else {
sk_sp<SkImageFilter> blurFilter(
SkImageFilters::Blur(aShadow.mSigma, aShadow.mSigma, nullptr));
sk_sp<SkColorFilter> colorFilter(SkColorFilters::Blend(
ColorToSkColor(aShadow.mColor, 1.0f), SkBlendMode::kSrcIn));
shadowPaint.setImageFilter(blurFilter);
shadowPaint.setColorFilter(colorFilter);
mCanvas->drawImage(image, shadowDest.x, shadowDest.y,
SkSamplingOptions(SkFilterMode::kLinear), &shadowPaint);
}
if (aSurface->GetFormat() != SurfaceFormat::A8) {
// Composite the original image after the shadow
auto dest = IntPoint::Round(aDest);
mCanvas->drawImage(image, dest.x, dest.y,
SkSamplingOptions(SkFilterMode::kLinear), &paint);
}
mCanvas->restore();
}
void DrawTargetSkia::FillRect(const Rect& aRect, const Pattern& aPattern,
const DrawOptions& aOptions) {
// The sprite blitting path in Skia can be faster than the shader blitter for
// operators other than source (or source-over with opaque surface). So, when
// possible/beneficial, route to DrawSurface which will use the sprite
// blitter.
if (aPattern.GetType() == PatternType::SURFACE &&
aOptions.mCompositionOp != CompositionOp::OP_SOURCE) {
const SurfacePattern& pat = static_cast<const SurfacePattern&>(aPattern);
// Verify there is a valid surface and a pattern matrix without skew.
if (pat.mSurface &&
(aOptions.mCompositionOp != CompositionOp::OP_OVER ||
GfxFormatToSkiaAlphaType(pat.mSurface->GetFormat()) !=
kOpaque_SkAlphaType) &&
!pat.mMatrix.HasNonAxisAlignedTransform()) {
// Bound the sampling to smaller of the bounds or the sampling rect.
IntRect srcRect(IntPoint(0, 0), pat.mSurface->GetSize());
if (!pat.mSamplingRect.IsEmpty()) {
srcRect = srcRect.Intersect(pat.mSamplingRect);
}
// Transform the destination rectangle by the inverse of the pattern
// matrix so that it is in pattern space like the source rectangle.
Rect patRect = aRect - pat.mMatrix.GetTranslation();
patRect.Scale(1.0f / pat.mMatrix._11, 1.0f / pat.mMatrix._22);
// Verify the pattern rectangle will not tile or clamp.
if (!patRect.IsEmpty() && srcRect.Contains(RoundedOut(patRect))) {
// The pattern is a surface with an axis-aligned source rectangle
// fitting entirely in its bounds, so just treat it as a DrawSurface.
DrawSurface(pat.mSurface, aRect, patRect,
DrawSurfaceOptions(pat.mSamplingFilter), aOptions);
return;
}
}
}
MarkChanged();
SkRect rect = RectToSkRect(aRect);
AutoPaintSetup paint(mCanvas, aOptions, aPattern, &aRect, nullptr, &aRect);
mCanvas->drawRect(rect, paint.mPaint);
}
void DrawTargetSkia::Stroke(const Path* aPath, const Pattern& aPattern,
const StrokeOptions& aStrokeOptions,
const DrawOptions& aOptions) {
MarkChanged();
MOZ_ASSERT(aPath, "Null path");
if (aPath->GetBackendType() != BackendType::SKIA) {
return;
}
const PathSkia* skiaPath = static_cast<const PathSkia*>(aPath);
AutoPaintSetup paint(mCanvas, aOptions, aPattern);
if (!StrokeOptionsToPaint(paint.mPaint, aStrokeOptions)) {
return;
}
if (!skiaPath->GetPath().isFinite()) {
return;
}
mCanvas->drawPath(skiaPath->GetPath(), paint.mPaint);
}
static Double DashPeriodLength(const StrokeOptions& aStrokeOptions) {
Double length = 0;
for (size_t i = 0; i < aStrokeOptions.mDashLength; i++) {
length += aStrokeOptions.mDashPattern[i];
}
if (aStrokeOptions.mDashLength & 1) {
// "If an odd number of values is provided, then the list of values is
// repeated to yield an even number of values."
// Double the length.
length += length;
}
return length;
}
static inline Double RoundDownToMultiple(Double aValue, Double aFactor) {
return floor(aValue / aFactor) * aFactor;
}
static Rect UserSpaceStrokeClip(const IntRect& aDeviceClip,
const Matrix& aTransform,
const StrokeOptions& aStrokeOptions) {
Matrix inverse = aTransform;
if (!inverse.Invert()) {
return Rect();
}
Rect deviceClip(aDeviceClip);
deviceClip.Inflate(MaxStrokeExtents(aStrokeOptions, aTransform));
return inverse.TransformBounds(deviceClip);
}
static Rect ShrinkClippedStrokedRect(const Rect& aStrokedRect,
const IntRect& aDeviceClip,
const Matrix& aTransform,
const StrokeOptions& aStrokeOptions) {
Rect userSpaceStrokeClip =
UserSpaceStrokeClip(aDeviceClip, aTransform, aStrokeOptions);
RectDouble strokedRectDouble(aStrokedRect.X(), aStrokedRect.Y(),
aStrokedRect.Width(), aStrokedRect.Height());
RectDouble intersection = strokedRectDouble.Intersect(
RectDouble(userSpaceStrokeClip.X(), userSpaceStrokeClip.Y(),
userSpaceStrokeClip.Width(), userSpaceStrokeClip.Height()));
Double dashPeriodLength = DashPeriodLength(aStrokeOptions);
if (intersection.IsEmpty() || dashPeriodLength == 0.0f) {
return Rect(intersection.X(), intersection.Y(), intersection.Width(),
intersection.Height());
}
// Reduce the rectangle side lengths in multiples of the dash period length
// so that the visible dashes stay in the same place.
MarginDouble insetBy = strokedRectDouble - intersection;
insetBy.top = RoundDownToMultiple(insetBy.top, dashPeriodLength);
insetBy.right = RoundDownToMultiple(insetBy.right, dashPeriodLength);
insetBy.bottom = RoundDownToMultiple(insetBy.bottom, dashPeriodLength);
insetBy.left = RoundDownToMultiple(insetBy.left, dashPeriodLength);
strokedRectDouble.Deflate(insetBy);
return Rect(strokedRectDouble.X(), strokedRectDouble.Y(),
strokedRectDouble.Width(), strokedRectDouble.Height());
}
void DrawTargetSkia::StrokeRect(const Rect& aRect, const Pattern& aPattern,
const StrokeOptions& aStrokeOptions,
const DrawOptions& aOptions) {
// Stroking large rectangles with dashes is expensive with Skia (fixed
// overhead based on the number of dashes, regardless of whether the dashes
// are visible), so we try to reduce the size of the stroked rectangle as
// much as possible before passing it on to Skia.
Rect rect = aRect;
if (aStrokeOptions.mDashLength > 0 && !rect.IsEmpty()) {
IntRect deviceClip(IntPoint(0, 0), mSize);
SkIRect clipBounds;
if (mCanvas->getDeviceClipBounds(&clipBounds)) {
deviceClip = SkIRectToIntRect(clipBounds);
}
rect =
ShrinkClippedStrokedRect(rect, deviceClip, mTransform, aStrokeOptions);
if (rect.IsEmpty()) {
return;
}
}
MarkChanged();
AutoPaintSetup paint(mCanvas, aOptions, aPattern);
if (!StrokeOptionsToPaint(paint.mPaint, aStrokeOptions)) {
return;
}
mCanvas->drawRect(RectToSkRect(rect), paint.mPaint);
}
void DrawTargetSkia::StrokeLine(const Point& aStart, const Point& aEnd,
const Pattern& aPattern,
const StrokeOptions& aStrokeOptions,
const DrawOptions& aOptions) {
MarkChanged();
AutoPaintSetup paint(mCanvas, aOptions, aPattern);
if (!StrokeOptionsToPaint(paint.mPaint, aStrokeOptions)) {
return;
}
mCanvas->drawLine(SkFloatToScalar(aStart.x), SkFloatToScalar(aStart.y),
SkFloatToScalar(aEnd.x), SkFloatToScalar(aEnd.y),
paint.mPaint);
}
void DrawTargetSkia::Fill(const Path* aPath, const Pattern& aPattern,
const DrawOptions& aOptions) {
MarkChanged();
if (!aPath || aPath->GetBackendType() != BackendType::SKIA) {
return;
}
const PathSkia* skiaPath = static_cast<const PathSkia*>(aPath);
AutoPaintSetup paint(mCanvas, aOptions, aPattern);
if (!skiaPath->GetPath().isFinite()) {
return;
}
mCanvas->drawPath(skiaPath->GetPath(), paint.mPaint);
}
#ifdef MOZ_WIDGET_COCOA
static inline CGAffineTransform GfxMatrixToCGAffineTransform(const Matrix& m) {
CGAffineTransform t;
t.a = m._11;
t.b = m._12;
t.c = m._21;
t.d = m._22;
t.tx = m._31;
t.ty = m._32;
return t;
}
/***
* We have to do a lot of work to draw glyphs with CG because
* CG assumes that the origin of rects are in the bottom left
* while every other DrawTarget assumes the top left is the origin.
* This means we have to transform the CGContext to have rects
* actually be applied in top left fashion. We do this by:
*
* 1) Translating the context up by the height of the canvas
* 2) Flipping the context by the Y axis so it's upside down.
*
* These two transforms put the origin in the top left.
* Transforms are better understood thinking about them from right to left order
* (mathematically).
*
* Consider a point we want to draw at (0, 10) in normal cartesian planes with
* a box of (100, 100). in CG terms, this would be at (0, 10).
* Positive Y values point up.
* In our DrawTarget terms, positive Y values point down, so (0, 10) would be
* at (0, 90) in cartesian plane terms. That means our point at (0, 10) in
* DrawTarget terms should end up at (0, 90). How does this work with the
* current transforms?
*
* Going right to left with the transforms, a CGPoint of (0, 10) has cartesian
* coordinates of (0, 10). The first flip of the Y axis puts the point now at
* (0, -10); Next, we translate the context up by the size of the canvas
* (Positive Y values go up in CG coordinates but down in our draw target
* coordinates). Since our canvas size is (100, 100), the resulting coordinate
* becomes (0, 90), which is what we expect from our DrawTarget code. These two
* transforms put the CG context equal to what every other DrawTarget expects.
*
* Next, we need two more transforms for actual text. IF we left the transforms
* as is, the text would be drawn upside down, so we need another flip of the Y
* axis to draw the text right side up. However, with only the flip, the text
* would be drawn in the wrong place. Thus we also have to invert the Y position
* of the glyphs to get them in the right place.
*
* Thus we have the following transforms:
* 1) Translation of the context up
* 2) Flipping the context around the Y axis
* 3) Flipping the context around the Y axis
* 4) Inverting the Y position of each glyph
*
* We cannot cancel out (2) and (3) as we have to apply the clips and transforms
* of DrawTargetSkia between (2) and (3).
*
* Consider the example letter P, drawn at (0, 20) in CG coordinates in a
* (100, 100) rect.
* Again, going right to left of the transforms. We'd get:
*
* 1) The letter P drawn at (0, -20) due to the inversion of the Y axis
* 2) The letter P upside down (b) at (0, 20) due to the second flip
* 3) The letter P right side up at (0, -20) due to the first flip
* 4) The letter P right side up at (0, 80) due to the translation
*
* tl;dr - CGRects assume origin is bottom left, DrawTarget rects assume top
* left.
*/
static bool SetupCGContext(DrawTargetSkia* aDT, CGContextRef aCGContext,
SkCanvas* aCanvas, const IntPoint& aOrigin,
const IntSize& aSize, bool aClipped) {
// DrawTarget expects the origin to be at the top left, but CG
// expects it to be at the bottom left. Transform to set the origin to
// the top left. Have to set this before we do anything else.
// This is transform (1) up top
CGContextTranslateCTM(aCGContext, -aOrigin.x, aOrigin.y + aSize.height);
// Transform (2) from the comments.
CGContextScaleCTM(aCGContext, 1, -1);
// Want to apply clips BEFORE the transform since the transform
// will apply to the clips we apply.
if (aClipped) {
SkRegion clipRegion;
aCanvas->temporary_internal_getRgnClip(&clipRegion);
Vector<CGRect, 8> rects;
for (SkRegion::Iterator it(clipRegion); !it.done(); it.next()) {
const SkIRect& rect = it.rect();
if (!rects.append(
CGRectMake(rect.x(), rect.y(), rect.width(), rect.height()))) {
break;
}
}
if (rects.length()) {
CGContextClipToRects(aCGContext, rects.begin(), rects.length());
}
}
CGContextConcatCTM(aCGContext,
GfxMatrixToCGAffineTransform(aDT->GetTransform()));
return true;
}
// End long comment about transforms.
// The context returned from this method will have the origin
// in the top left and will have applied all the neccessary clips
// and transforms to the CGContext. See the comment above
// SetupCGContext.
CGContextRef DrawTargetSkia::BorrowCGContext(const DrawOptions& aOptions) {
// Since we can't replay Skia clips, we have to use a layer if we have a
// complex clip. After saving a layer, the SkCanvas queries for needing a
// layer change so save if we pushed a layer.
mNeedLayer = !mCanvas->isClipEmpty() && !mCanvas->isClipRect();
if (mNeedLayer) {
SkPaint paint;
paint.setBlendMode(SkBlendMode::kSrc);
SkCanvas::SaveLayerRec rec(nullptr, &paint,
SkCanvas::kInitWithPrevious_SaveLayerFlag);
mCanvas->saveLayer(rec);
}
uint8_t* data = nullptr;
int32_t stride;
SurfaceFormat format;
IntSize size;
IntPoint origin;
if (!LockBits(&data, &size, &stride, &format, &origin)) {
NS_WARNING("Could not lock skia bits to wrap CG around");
return nullptr;
}
if (!mNeedLayer && (data == mCanvasData) && mCG && (mCGSize == size)) {
// If our canvas data still points to the same data,
// we can reuse the CG Context
CGContextSetAlpha(mCG, aOptions.mAlpha);
CGContextSetShouldAntialias(mCG,
aOptions.mAntialiasMode != AntialiasMode::NONE);
CGContextSaveGState(mCG);
SetupCGContext(this, mCG, mCanvas, origin, size, true);
return mCG;
}
if (!mColorSpace) {
mColorSpace = (format == SurfaceFormat::A8) ? CGColorSpaceCreateDeviceGray()
: CGColorSpaceCreateDeviceRGB();
}
if (mCG) {
// Release the old CG context since it's no longer valid.
CGContextRelease(mCG);
}
mCanvasData = data;
mCGSize = size;
uint32_t bitmapInfo =
(format == SurfaceFormat::A8)
? kCGImageAlphaOnly
: kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host;
mCG = CGBitmapContextCreateWithData(
mCanvasData, mCGSize.width, mCGSize.height, 8, /* bits per component */
stride, mColorSpace, bitmapInfo, NULL, /* Callback when released */
NULL);
if (!mCG) {
if (mNeedLayer) {
mCanvas->restore();
}
ReleaseBits(mCanvasData);
NS_WARNING("Could not create bitmap around skia data\n");
return nullptr;
}
CGContextSetAlpha(mCG, aOptions.mAlpha);
CGContextSetShouldAntialias(mCG,
aOptions.mAntialiasMode != AntialiasMode::NONE);
CGContextSetShouldSmoothFonts(mCG, true);
CGContextSetTextDrawingMode(mCG, kCGTextFill);
CGContextSaveGState(mCG);
SetupCGContext(this, mCG, mCanvas, origin, size, !mNeedLayer);
return mCG;
}
void DrawTargetSkia::ReturnCGContext(CGContextRef aCGContext) {
MOZ_ASSERT(aCGContext == mCG);
ReleaseBits(mCanvasData);
CGContextRestoreGState(aCGContext);
if (mNeedLayer) {
// A layer was used for clipping and is about to be popped by the restore.
// Make sure the CG context referencing it is released first so the popped
// layer doesn't accidentally get used.
if (mCG) {
CGContextRelease(mCG);
mCG = nullptr;
}
mCanvas->restore();
}
}
CGContextRef BorrowedCGContext::BorrowCGContextFromDrawTarget(DrawTarget* aDT) {
DrawTargetSkia* skiaDT = static_cast<DrawTargetSkia*>(aDT);
return skiaDT->BorrowCGContext(DrawOptions());
}
void BorrowedCGContext::ReturnCGContextToDrawTarget(DrawTarget* aDT,
CGContextRef cg) {
DrawTargetSkia* skiaDT = static_cast<DrawTargetSkia*>(aDT);
skiaDT->ReturnCGContext(cg);
}
#endif
static bool CanDrawFont(ScaledFont* aFont) {
switch (aFont->GetType()) {
case FontType::FREETYPE:
case FontType::FONTCONFIG:
case FontType::MAC:
case FontType::GDI:
case FontType::DWRITE:
return true;
default:
return false;
}
}
void DrawTargetSkia::DrawGlyphs(ScaledFont* aFont, const GlyphBuffer& aBuffer,
const Pattern& aPattern,
const StrokeOptions* aStrokeOptions,
const DrawOptions& aOptions) {
if (!CanDrawFont(aFont)) {
return;
}
MarkChanged();
ScaledFontBase* skiaFont = static_cast<ScaledFontBase*>(aFont);
SkTypeface* typeface = skiaFont->GetSkTypeface();
if (!typeface) {
return;
}
AutoPaintSetup paint(mCanvas, aOptions, aPattern);
if (aStrokeOptions && !StrokeOptionsToPaint(paint.mPaint, *aStrokeOptions)) {
return;
}
AntialiasMode aaMode = aFont->GetDefaultAAMode();
if (aOptions.mAntialiasMode != AntialiasMode::DEFAULT) {
aaMode = aOptions.mAntialiasMode;
}
bool aaEnabled = aaMode != AntialiasMode::NONE;
paint.mPaint.setAntiAlias(aaEnabled);
SkFont font(sk_ref_sp(typeface), SkFloatToScalar(skiaFont->mSize));
bool useSubpixelAA =
GetPermitSubpixelAA() &&
(aaMode == AntialiasMode::DEFAULT || aaMode == AntialiasMode::SUBPIXEL);
font.setEdging(useSubpixelAA ? SkFont::Edging::kSubpixelAntiAlias
: (aaEnabled ? SkFont::Edging::kAntiAlias
: SkFont::Edging::kAlias));
skiaFont->SetupSkFontDrawOptions(font);
// Limit the amount of internal batch allocations Skia does.
const uint32_t kMaxGlyphBatchSize = 8192;
for (uint32_t offset = 0; offset < aBuffer.mNumGlyphs;) {
uint32_t batchSize =
std::min(aBuffer.mNumGlyphs - offset, kMaxGlyphBatchSize);
SkTextBlobBuilder builder;
auto runBuffer = builder.allocRunPos(font, batchSize);
for (uint32_t i = 0; i < batchSize; i++, offset++) {
runBuffer.glyphs[i] = aBuffer.mGlyphs[offset].mIndex;
runBuffer.points()[i] = PointToSkPoint(aBuffer.mGlyphs[offset].mPosition);
}
sk_sp<SkTextBlob> text = builder.make();
mCanvas->drawTextBlob(text, 0, 0, paint.mPaint);
}
}
Maybe<Rect> DrawTargetSkia::GetGlyphLocalBounds(
ScaledFont* aFont, const GlyphBuffer& aBuffer, const Pattern& aPattern,
const StrokeOptions* aStrokeOptions, const DrawOptions& aOptions) {
if (!CanDrawFont(aFont)) {
return Nothing();
}
ScaledFontBase* skiaFont = static_cast<ScaledFontBase*>(aFont);
SkTypeface* typeface = skiaFont->GetSkTypeface();
if (!typeface) {
return Nothing();
}
AutoPaintSetup paint(mCanvas, aOptions, aPattern);
if (aStrokeOptions && !StrokeOptionsToPaint(paint.mPaint, *aStrokeOptions)) {
return Nothing();
}
AntialiasMode aaMode = aFont->GetDefaultAAMode();
if (aOptions.mAntialiasMode != AntialiasMode::DEFAULT) {
aaMode = aOptions.mAntialiasMode;
}
bool aaEnabled = aaMode != AntialiasMode::NONE;
paint.mPaint.setAntiAlias(aaEnabled);
SkFont font(sk_ref_sp(typeface), SkFloatToScalar(skiaFont->mSize));
bool useSubpixelAA =
GetPermitSubpixelAA() &&
(aaMode == AntialiasMode::DEFAULT || aaMode == AntialiasMode::SUBPIXEL);
font.setEdging(useSubpixelAA ? SkFont::Edging::kSubpixelAntiAlias
: (aaEnabled ? SkFont::Edging::kAntiAlias
: SkFont::Edging::kAlias));
skiaFont->SetupSkFontDrawOptions(font);
// Limit the amount of internal batch allocations Skia does.
const uint32_t kMaxGlyphBatchSize = 8192;
// Avoid using TextBlobBuilder for bounds computations as the conservative
// bounds can be wrong due to buggy font metrics. Instead, explicitly compute
// tight bounds directly with the SkFont.
Vector<SkGlyphID, 32> glyphs;
Vector<SkRect, 32> rects;
Rect bounds;
for (uint32_t offset = 0; offset < aBuffer.mNumGlyphs;) {
uint32_t batchSize =
std::min(aBuffer.mNumGlyphs - offset, kMaxGlyphBatchSize);
if (glyphs.resizeUninitialized(batchSize) &&
rects.resizeUninitialized(batchSize)) {
for (uint32_t i = 0; i < batchSize; i++) {
glyphs[i] = aBuffer.mGlyphs[offset + i].mIndex;
}
font.getBounds(glyphs.begin(), batchSize, rects.begin(), nullptr);
for (uint32_t i = 0; i < batchSize; i++) {
bounds = bounds.Union(SkRectToRect(rects[i]) +
aBuffer.mGlyphs[offset + i].mPosition);
}
}
offset += batchSize;
}
SkRect storage;
bounds = SkRectToRect(
paint.mPaint.computeFastBounds(RectToSkRect(bounds), &storage));
if (bounds.IsEmpty()) {
return Nothing();
}
return Some(bounds);
}
void DrawTargetSkia::FillGlyphs(ScaledFont* aFont, const GlyphBuffer& aBuffer,
const Pattern& aPattern,
const DrawOptions& aOptions) {
DrawGlyphs(aFont, aBuffer, aPattern, nullptr, aOptions);
}
void DrawTargetSkia::StrokeGlyphs(ScaledFont* aFont, const GlyphBuffer& aBuffer,
const Pattern& aPattern,
const StrokeOptions& aStrokeOptions,
const DrawOptions& aOptions) {
DrawGlyphs(aFont, aBuffer, aPattern, &aStrokeOptions, aOptions);
}
void DrawTargetSkia::Mask(const Pattern& aSource, const Pattern& aMask,
const DrawOptions& aOptions) {
Maybe<MutexAutoLock> lock;
SkPaint maskPaint;
SetPaintPattern(maskPaint, aMask, lock);
sk_sp<SkShader> maskShader(maskPaint.refShader());
if (!maskShader && maskPaint.getAlpha() != 0xFF) {
if (maskPaint.getAlpha() == 0) {
return;
}
maskShader = SkShaders::Color(maskPaint.getColor());
if (!maskShader) {
gfxDebug() << "Failed creating Skia clip shader for Mask";
return;
}
}
MarkChanged();
AutoPaintSetup paint(mCanvas, aOptions, aSource);
mCanvas->save();
if (maskShader) {
mCanvas->clipShader(maskShader);
}
mCanvas->drawPaint(paint.mPaint);
mCanvas->restore();
}
void DrawTargetSkia::MaskSurface(const Pattern& aSource, SourceSurface* aMask,
Point aOffset, const DrawOptions& aOptions) {
Maybe<MutexAutoLock> lock;
sk_sp<SkImage> maskImage = GetSkImageForSurface(aMask, &lock);
SkMatrix maskOffset = SkMatrix::Translate(
PointToSkPoint(aOffset + Point(aMask->GetRect().TopLeft())));
sk_sp<SkShader> maskShader = maskImage->makeShader(
SkTileMode::kClamp, SkTileMode::kClamp,
SkSamplingOptions(SkFilterMode::kLinear), maskOffset);
if (!maskShader) {
gfxDebug() << "Failed creating Skia clip shader for MaskSurface";
return;
}
MarkChanged();
AutoPaintSetup paint(mCanvas, aOptions, aSource);
mCanvas->save();
mCanvas->clipShader(maskShader);
mCanvas->drawRect(RectToSkRect(Rect(aMask->GetRect()) + aOffset),
paint.mPaint);
mCanvas->restore();
}
bool DrawTarget::Draw3DTransformedSurface(SourceSurface* aSurface,
const Matrix4x4& aMatrix) {
// Composite the 3D transform with the DT's transform.
Matrix4x4 fullMat = aMatrix * Matrix4x4::From2D(mTransform);
if (fullMat.IsSingular()) {
return false;
}
// Transform the surface bounds and clip to this DT.
IntRect xformBounds = RoundedOut(fullMat.TransformAndClipBounds(
Rect(Point(0, 0), Size(aSurface->GetSize())),
Rect(Point(0, 0), Size(GetSize()))));
if (xformBounds.IsEmpty()) {
return true;
}
// Offset the matrix by the transformed origin.
fullMat.PostTranslate(-xformBounds.X(), -xformBounds.Y(), 0);
// Read in the source data.
Maybe<MutexAutoLock> lock;
sk_sp<SkImage> srcImage = GetSkImageForSurface(aSurface, &lock);
if (!srcImage) {
return true;
}
// Set up an intermediate destination surface only the size of the transformed
// bounds. Try to pass through the source's format unmodified in both the BGRA
// and ARGB cases.
RefPtr<DataSourceSurface> dstSurf = Factory::CreateDataSourceSurface(
xformBounds.Size(),
!srcImage->isOpaque() ? aSurface->GetFormat()
: SurfaceFormat::A8R8G8B8_UINT32,
true);
if (!dstSurf) {
return false;
}
DataSourceSurface::ScopedMap map(dstSurf, DataSourceSurface::READ_WRITE);
if (!map.IsMapped()) {
return false;
}
std::unique_ptr<SkCanvas> dstCanvas(SkCanvas::MakeRasterDirect(
SkImageInfo::Make(xformBounds.Width(), xformBounds.Height(),
GfxFormatToSkiaColorType(dstSurf->GetFormat()),
kPremul_SkAlphaType),
map.GetData(), map.GetStride()));
if (!dstCanvas) {
return false;
}
// Do the transform.
SkPaint paint;
paint.setAntiAlias(true);
paint.setBlendMode(SkBlendMode::kSrc);
SkMatrix xform;
GfxMatrixToSkiaMatrix(fullMat, xform);
dstCanvas->setMatrix(xform);
dstCanvas->drawImage(srcImage, 0, 0, SkSamplingOptions(SkFilterMode::kLinear),
&paint);
// Temporarily reset the DT's transform, since it has already been composed
// above.
Matrix origTransform = mTransform;
SetTransform(Matrix());
// Draw the transformed surface within the transformed bounds.
DrawSurface(dstSurf, Rect(xformBounds),
Rect(Point(0, 0), Size(xformBounds.Size())));
SetTransform(origTransform);
return true;
}
bool DrawTargetSkia::Draw3DTransformedSurface(SourceSurface* aSurface,
const Matrix4x4& aMatrix) {
if (aMatrix.IsSingular()) {
return false;
}
MarkChanged();
Maybe<MutexAutoLock> lock;
sk_sp<SkImage> image = GetSkImageForSurface(aSurface, &lock);
if (!image) {
return true;
}
mCanvas->save();
SkPaint paint;
paint.setAntiAlias(true);
SkMatrix xform;
GfxMatrixToSkiaMatrix(aMatrix, xform);
mCanvas->concat(xform);
mCanvas->drawImage(image, 0, 0, SkSamplingOptions(SkFilterMode::kLinear),
&paint);
mCanvas->restore();
return true;
}
already_AddRefed<SourceSurface> DrawTargetSkia::CreateSourceSurfaceFromData(
unsigned char* aData, const IntSize& aSize, int32_t aStride,
SurfaceFormat aFormat) const {
RefPtr<SourceSurfaceSkia> newSurf = new SourceSurfaceSkia();
if (!newSurf->InitFromData(aData, aSize, aStride, aFormat)) {
gfxDebug() << *this
<< ": Failure to create source surface from data. Size: "
<< aSize;
return nullptr;
}
return newSurf.forget();
}
already_AddRefed<DrawTarget> DrawTargetSkia::CreateSimilarDrawTarget(
const IntSize& aSize, SurfaceFormat aFormat) const {
RefPtr<DrawTargetSkia> target = new DrawTargetSkia();
#ifdef DEBUG
if (!IsBackedByPixels(mCanvas)) {
// If our canvas is backed by vector storage such as PDF then we want to
// create a new DrawTarget with similar storage to avoid losing fidelity
// (fidelity will be lost if the returned DT is Snapshot()'ed and drawn
// back onto us since a raster will be drawn instead of vector commands).
NS_WARNING("Not backed by pixels - we need to handle PDF backed SkCanvas");
}
#endif
if (!target->Init(aSize, aFormat)) {
return nullptr;
}
return target.forget();
}
bool DrawTargetSkia::CanCreateSimilarDrawTarget(const IntSize& aSize,
SurfaceFormat aFormat) const {
auto minmaxPair = std::minmax(aSize.width, aSize.height);
return minmaxPair.first > 0 &&
size_t(minmaxPair.second) < GetMaxSurfaceSize();
}
RefPtr<DrawTarget> DrawTargetSkia::CreateClippedDrawTarget(
const Rect& aBounds, SurfaceFormat aFormat) {
SkIRect clipBounds;
RefPtr<DrawTarget> result;
// Doing this save()/restore() dance is wasteful
mCanvas->save();
if (!aBounds.IsEmpty()) {
mCanvas->clipRect(RectToSkRect(aBounds), SkClipOp::kIntersect, true);
}
if (mCanvas->getDeviceClipBounds(&clipBounds)) {
RefPtr<DrawTarget> dt = CreateSimilarDrawTarget(
IntSize(clipBounds.width(), clipBounds.height()), aFormat);
if (dt) {
result = gfx::Factory::CreateOffsetDrawTarget(
dt, IntPoint(clipBounds.x(), clipBounds.y()));
if (result) {
result->SetTransform(mTransform);
}
}
} else {
// Everything is clipped but we still want some kind of surface
result = CreateSimilarDrawTarget(IntSize(1, 1), aFormat);
}
mCanvas->restore();
return result;
}
already_AddRefed<SourceSurface>
DrawTargetSkia::OptimizeSourceSurfaceForUnknownAlpha(
SourceSurface* aSurface) const {
if (aSurface->GetType() == SurfaceType::SKIA) {
RefPtr<SourceSurface> surface(aSurface);
return surface.forget();
}
if (RefPtr<DataSourceSurface> dataSurface = aSurface->GetDataSurface()) {
DataSourceSurface::ScopedMap map(dataSurface,
DataSourceSurface::READ_WRITE);
if (map.IsMapped()) {
// For plugins, GDI can sometimes just write 0 to the alpha channel
// even for RGBX formats. In this case, we have to manually write
// the alpha channel to make Skia happy with RGBX and in case GDI
// writes some bad data. Luckily, this only happens on plugins.
WriteRGBXFormat(map.GetData(), dataSurface->GetSize(), map.GetStride(),
dataSurface->GetFormat());
return dataSurface.forget();
}
}
return nullptr;
}
already_AddRefed<SourceSurface> DrawTargetSkia::OptimizeSourceSurface(
SourceSurface* aSurface) const {
if (aSurface->GetType() == SurfaceType::SKIA) {
RefPtr<SourceSurface> surface(aSurface);
return surface.forget();
}
// If we're not using skia-gl then drawing doesn't require any
// uploading, so any data surface is fine. Call GetDataSurface
// to trigger any required readback so that it only happens
// once.
if (RefPtr<DataSourceSurface> dataSurface = aSurface->GetDataSurface()) {
#ifdef DEBUG
DataSourceSurface::ScopedMap map(dataSurface, DataSourceSurface::READ);
if (map.IsMapped()) {
MOZ_ASSERT(VerifyRGBXFormat(map.GetData(), dataSurface->GetSize(),
map.GetStride(), dataSurface->GetFormat()));
}
#endif
return dataSurface.forget();
}
return nullptr;
}
already_AddRefed<SourceSurface>
DrawTargetSkia::CreateSourceSurfaceFromNativeSurface(
const NativeSurface& aSurface) const {
return nullptr;
}
void DrawTargetSkia::CopySurface(SourceSurface* aSurface,
const IntRect& aSourceRect,
const IntPoint& aDestination) {
MarkChanged();
Maybe<MutexAutoLock> lock;
sk_sp<SkImage> image = GetSkImageForSurface(aSurface, &lock);
if (!image) {
return;
}
SkPixmap srcPixmap;
if (!image->peekPixels(&srcPixmap)) {
return;
}
// Ensure the source rect intersects the surface bounds.
IntRect srcRect = aSourceRect.Intersect(SkIRectToIntRect(srcPixmap.bounds()));
// Move the destination offset to match the altered source rect.
IntPoint dstOffset =
aDestination + (srcRect.TopLeft() - aSourceRect.TopLeft());
// Then ensure the dest rect intersect the canvas bounds.
IntRect dstRect = IntRect(dstOffset, srcRect.Size()).Intersect(GetRect());
// Move the source rect to match the altered dest rect.
srcRect += dstRect.TopLeft() - dstOffset;
srcRect.SizeTo(dstRect.Size());
if (!srcPixmap.extractSubset(&srcPixmap, IntRectToSkIRect(srcRect))) {
return;
}
mCanvas->writePixels(srcPixmap.info(), srcPixmap.addr(), srcPixmap.rowBytes(),
dstRect.x, dstRect.y);
}
static inline SkPixelGeometry GetSkPixelGeometry() {
return Factory::GetBGRSubpixelOrder() ? kBGR_H_SkPixelGeometry
: kRGB_H_SkPixelGeometry;
}
template <typename T>
[[nodiscard]] static already_AddRefed<T> AsRefPtr(sk_sp<T>&& aSkPtr) {
return already_AddRefed<T>(aSkPtr.release());
}
bool DrawTargetSkia::Init(const IntSize& aSize, SurfaceFormat aFormat) {
if (size_t(std::max(aSize.width, aSize.height)) > GetMaxSurfaceSize()) {
return false;
}
// we need to have surfaces that have a stride aligned to 4 for interop with
// cairo
SkImageInfo info = MakeSkiaImageInfo(aSize, aFormat);
size_t stride = GetAlignedStride<4>(info.width(), info.bytesPerPixel());
if (!stride) {
return false;
}
SkSurfaceProps props(0, GetSkPixelGeometry());
if (aFormat == SurfaceFormat::A8) {
// Skia does not fully allocate the last row according to stride.
// Since some of our algorithms (i.e. blur) depend on this, we must allocate
// the bitmap pixels manually.
CheckedInt<size_t> size = stride;
size *= info.height();
// We need to leave room for an additional 3 bytes for a potential overrun
// in our blurring code.
size += 3;
if (!size.isValid()) {
return false;
}
void* buf = sk_malloc_flags(size.value(), SK_MALLOC_ZERO_INITIALIZE);
if (!buf) {
return false;
}
mSurface = AsRefPtr(SkSurfaces::WrapPixels(
info, buf, stride, FreeAlphaPixels, nullptr, &props));
} else {
mSurface = AsRefPtr(SkSurfaces::Raster(info, stride, &props));
}
if (!mSurface) {
return false;
}
mSize = aSize;
mFormat = aFormat;
mCanvas = mSurface->getCanvas();
SetPermitSubpixelAA(IsOpaque(mFormat));
if (info.isOpaque()) {
mCanvas->clear(SK_ColorBLACK);
}
return true;
}
bool DrawTargetSkia::Init(SkCanvas* aCanvas) {
mCanvas = aCanvas;
SkImageInfo imageInfo = mCanvas->imageInfo();
// If the canvas is backed by pixels we clear it to be on the safe side. If
// it's not (for example, for PDF output) we don't.
if (IsBackedByPixels(mCanvas)) {
SkColor clearColor =
imageInfo.isOpaque() ? SK_ColorBLACK : SK_ColorTRANSPARENT;
mCanvas->clear(clearColor);
}
SkISize size = mCanvas->getBaseLayerSize();
mSize.width = size.width();
mSize.height = size.height();
mFormat =
SkiaColorTypeToGfxFormat(imageInfo.colorType(), imageInfo.alphaType());
SetPermitSubpixelAA(IsOpaque(mFormat));
return true;
}
bool DrawTargetSkia::Init(unsigned char* aData, const IntSize& aSize,
int32_t aStride, SurfaceFormat aFormat,
bool aUninitialized) {
MOZ_ASSERT((aFormat != SurfaceFormat::B8G8R8X8) || aUninitialized ||
VerifyRGBXFormat(aData, aSize, aStride, aFormat));
SkSurfaceProps props(0, GetSkPixelGeometry());
mSurface = AsRefPtr(SkSurfaces::WrapPixels(MakeSkiaImageInfo(aSize, aFormat),
aData, aStride, &props));
if (!mSurface) {
return false;
}
mSize = aSize;
mFormat = aFormat;
mCanvas = mSurface->getCanvas();
SetPermitSubpixelAA(IsOpaque(mFormat));
return true;
}
bool DrawTargetSkia::Init(RefPtr<DataSourceSurface>&& aSurface) {
auto map =
new DataSourceSurface::ScopedMap(aSurface, DataSourceSurface::READ_WRITE);
if (!map->IsMapped()) {
delete map;
return false;
}
SurfaceFormat format = aSurface->GetFormat();
IntSize size = aSurface->GetSize();
MOZ_ASSERT((format != SurfaceFormat::B8G8R8X8) ||
VerifyRGBXFormat(map->GetData(), size, map->GetStride(), format));
SkSurfaceProps props(0, GetSkPixelGeometry());
mSurface = AsRefPtr(SkSurfaces::WrapPixels(
MakeSkiaImageInfo(size, format), map->GetData(), map->GetStride(),
DrawTargetSkia::ReleaseMappedSkSurface, map, &props));
if (!mSurface) {
delete map;
return false;
}
// map is now owned by mSurface
mBackingSurface = std::move(aSurface);
mSize = size;
mFormat = format;
mCanvas = mSurface->getCanvas();
SetPermitSubpixelAA(IsOpaque(format));
return true;
}
/* static */ void DrawTargetSkia::ReleaseMappedSkSurface(void* aPixels,
void* aContext) {
auto map = reinterpret_cast<DataSourceSurface::ScopedMap*>(aContext);
delete map;
}
void DrawTargetSkia::SetTransform(const Matrix& aTransform) {
SkMatrix mat;
GfxMatrixToSkiaMatrix(aTransform, mat);
mCanvas->setMatrix(mat);
mTransform = aTransform;
}
void* DrawTargetSkia::GetNativeSurface(NativeSurfaceType aType) {
return nullptr;
}
already_AddRefed<PathBuilder> DrawTargetSkia::CreatePathBuilder(
FillRule aFillRule) const {
return PathBuilderSkia::Create(aFillRule);
}
void DrawTargetSkia::ClearRect(const Rect& aRect) {
MarkChanged();
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor((mFormat == SurfaceFormat::B8G8R8X8) ? SK_ColorBLACK
: SK_ColorTRANSPARENT);
paint.setBlendMode(SkBlendMode::kSrc);
mCanvas->drawRect(RectToSkRect(aRect), paint);
}
void DrawTargetSkia::PushClip(const Path* aPath) {
if (aPath->GetBackendType() != BackendType::SKIA) {
return;
}
const PathSkia* skiaPath = static_cast<const PathSkia*>(aPath);
mCanvas->save();
mCanvas->clipPath(skiaPath->GetPath(), SkClipOp::kIntersect, true);
}
void DrawTargetSkia::PushDeviceSpaceClipRects(const IntRect* aRects,
uint32_t aCount) {
// Build a region by unioning all the rects together.
SkRegion region;
for (uint32_t i = 0; i < aCount; i++) {
region.op(IntRectToSkIRect(aRects[i]), SkRegion::kUnion_Op);
}
// Clip with the resulting region. clipRegion does not transform
// this region by the current transform, unlike the other SkCanvas
// clip methods, so it is just passed through in device-space.
mCanvas->save();
mCanvas->clipRegion(region, SkClipOp::kIntersect);
}
void DrawTargetSkia::PushClipRect(const Rect& aRect) {
SkRect rect = RectToSkRect(aRect);
mCanvas->save();
mCanvas->clipRect(rect, SkClipOp::kIntersect, true);
}
void DrawTargetSkia::PopClip() {
mCanvas->restore();
SetTransform(GetTransform());
}
bool DrawTargetSkia::RemoveAllClips() {
mCanvas->restoreToCount(1);
SetTransform(GetTransform());
return true;
}
// Get clip bounds in device space for the clipping region. By default, only
// bounds for simple (empty or rect) regions are reported. If explicitly
// allowed, the bounds will be reported for complex (all other) regions as well.
Maybe<IntRect> DrawTargetSkia::GetDeviceClipRect(bool aAllowComplex) const {
if (mCanvas->isClipEmpty()) {
return Some(IntRect());
}
if (aAllowComplex || mCanvas->isClipRect()) {
SkIRect deviceBounds;
if (mCanvas->getDeviceClipBounds(&deviceBounds)) {
return Some(SkIRectToIntRect(deviceBounds));
}
}
return Nothing();
}
void DrawTargetSkia::PushLayer(bool aOpaque, Float aOpacity,
SourceSurface* aMask,
const Matrix& aMaskTransform,
const IntRect& aBounds, bool aCopyBackground) {
PushLayerWithBlend(aOpaque, aOpacity, aMask, aMaskTransform, aBounds,
aCopyBackground, CompositionOp::OP_OVER);
}
void DrawTargetSkia::PushLayerWithBlend(bool aOpaque, Float aOpacity,
SourceSurface* aMask,
const Matrix& aMaskTransform,
const IntRect& aBounds,
bool aCopyBackground,
CompositionOp aCompositionOp) {
SkPaint paint;
paint.setAlpha(ColorFloatToByte(aOpacity));
paint.setBlendMode(GfxOpToSkiaOp(aCompositionOp));
// aBounds is supplied in device space, but SaveLayerRec wants local space.
SkRect bounds = SkRect::MakeEmpty();
if (!aBounds.IsEmpty()) {
Matrix inverseTransform = mTransform;
if (inverseTransform.Invert()) {
bounds = RectToSkRect(inverseTransform.TransformBounds(Rect(aBounds)));
}
}
// We don't pass a lock object to GetSkImageForSurface here, to force a
// copy of the data if this is a copy-on-write snapshot. If we instead held
// the lock until the corresponding PopLayer, we'd risk deadlocking if someone
// tried to touch the originating DrawTarget while the layer was pushed.
sk_sp<SkImage> clipImage = GetSkImageForSurface(aMask, nullptr);
bool usedMask = false;
if (bool(clipImage)) {
Rect maskBounds(aMask->GetRect());
sk_sp<SkShader> shader = clipImage->makeShader(
SkTileMode::kClamp, SkTileMode::kClamp,
SkSamplingOptions(SkFilterMode::kLinear),
SkMatrix::Translate(PointToSkPoint(maskBounds.TopLeft())));
if (shader) {
usedMask = true;
mCanvas->save();
auto oldMatrix = mCanvas->getLocalToDevice();
SkMatrix clipMatrix;
GfxMatrixToSkiaMatrix(aMaskTransform, clipMatrix);
mCanvas->concat(clipMatrix);
mCanvas->clipRect(RectToSkRect(maskBounds));
mCanvas->clipShader(shader);
mCanvas->setMatrix(oldMatrix);
} else {
gfxDebug() << "Failed to create Skia clip shader for PushLayerWithBlend";
}
}
PushedLayer layer(GetPermitSubpixelAA(), usedMask ? aMask : nullptr);
mPushedLayers.push_back(layer);
SkCanvas::SaveLayerRec saveRec(
aBounds.IsEmpty() ? nullptr : &bounds, &paint, nullptr,
SkCanvas::kPreserveLCDText_SaveLayerFlag |
(aCopyBackground ? SkCanvas::kInitWithPrevious_SaveLayerFlag : 0));
mCanvas->saveLayer(saveRec);
SetPermitSubpixelAA(aOpaque);
#ifdef MOZ_WIDGET_COCOA
CGContextRelease(mCG);
mCG = nullptr;
#endif
}
void DrawTargetSkia::PopLayer() {
MOZ_RELEASE_ASSERT(!mPushedLayers.empty());
MarkChanged();
const PushedLayer& layer = mPushedLayers.back();
mCanvas->restore();
if (layer.mMask) {
mCanvas->restore();
}
SetTransform(GetTransform());
SetPermitSubpixelAA(layer.mOldPermitSubpixelAA);
mPushedLayers.pop_back();
#ifdef MOZ_WIDGET_COCOA
CGContextRelease(mCG);
mCG = nullptr;
#endif
}
already_AddRefed<GradientStops> DrawTargetSkia::CreateGradientStops(
GradientStop* aStops, uint32_t aNumStops, ExtendMode aExtendMode) const {
std::vector<GradientStop> stops;
stops.resize(aNumStops);
for (uint32_t i = 0; i < aNumStops; i++) {
stops[i] = aStops[i];
}
std::stable_sort(stops.begin(), stops.end());
return MakeAndAddRef<GradientStopsSkia>(stops, aNumStops, aExtendMode);
}
already_AddRefed<FilterNode> DrawTargetSkia::CreateFilter(FilterType aType) {
return FilterNodeSoftware::Create(aType);
}
void DrawTargetSkia::MarkChanged() {
// I'm not entirely certain whether this lock is needed, as multiple threads
// should never modify the DrawTarget at the same time anyway, but this seems
// like the safest.
MutexAutoLock lock(mSnapshotLock);
if (mSnapshot) {
if (mSnapshot->hasOneRef()) {
// No owners outside of this DrawTarget's own reference. Just dump it.
mSnapshot = nullptr;
return;
}
mSnapshot->DrawTargetWillChange();
mSnapshot = nullptr;
// Handle copying of any image snapshots bound to the surface.
if (mSurface) {
mSurface->notifyContentWillChange(SkSurface::kRetain_ContentChangeMode);
}
}
}
} // namespace mozilla::gfx
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