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DrawTargetSkia.cpp
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DrawTargetSkia.cpp
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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/ArrayUtils.h"
#include "mozilla/CheckedInt.h"
#include "mozilla/Vector.h"
#include "skia/include/core/SkFont.h"
#include "skia/include/core/SkTextBlob.h"
#include "skia/include/core/SkSurface.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/SkBlurImageFilter.h"
#include "Blur.h"
#include "Logging.h"
#include "Tools.h"
#include "DataSurfaceHelpers.h"
#include "PathHelpers.h"
#include "SourceSurfaceCapture.h"
#include "Swizzle.h"
#include <algorithm>
#ifdef MOZ_WIDGET_COCOA
# include "BorrowedContext.h"
# include <ApplicationServices/ApplicationServices.h>
# include "ScaledFontMac.h"
# include "CGTextDrawing.h"
#endif
#ifdef XP_WIN
# include "ScaledFontDWrite.h"
#endif
using namespace std;
namespace mozilla {
namespace 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 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,
const Rect* aBounds = nullptr,
const Matrix* aMatrix = nullptr) {
if (!aSurface) {
gfxDebug() << "Creating null Skia image from null SourceSurface";
return nullptr;
}
if (aSurface->GetType() == SurfaceType::CAPTURE) {
SourceSurfaceCapture* capture =
static_cast<SourceSurfaceCapture*>(aSurface);
RefPtr<SourceSurface> resolved = capture->Resolve(BackendType::SKIA);
if (!resolved) {
return nullptr;
}
MOZ_ASSERT(resolved->GetType() != SurfaceType::CAPTURE);
return GetSkImageForSurface(resolved, aBounds, aMatrix);
}
if (aSurface->GetType() == SurfaceType::SKIA) {
return static_cast<SourceSurfaceSkia*>(aSurface)->GetImage();
}
DataSourceSurface* surf = aSurface->GetDataSurface().take();
if (!surf) {
gfxWarning() << "Failed getting DataSourceSurface for Skia image";
return nullptr;
}
SkPixmap pixmap(MakeSkiaImageInfo(surf->GetSize(), surf->GetFormat()),
surf->GetData(), surf->Stride());
sk_sp<SkImage> image =
SkImage::MakeFromRaster(pixmap, ReleaseTemporarySurface, surf);
if (!image) {
ReleaseTemporarySurface(nullptr, surf);
gfxDebug() << "Failed making Skia raster image for temporary surface";
}
// Skia doesn't support RGBX surfaces so ensure that the alpha value is opaque
// white.
MOZ_ASSERT(VerifyRGBXCorners(surf->GetData(), surf->GetSize(), surf->Stride(),
surf->GetFormat(), aBounds, aMatrix));
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);
}
#ifdef MOZ_WIDGET_COCOA
if (mCG) {
CGContextRelease(mCG);
mCG = nullptr;
}
if (mColorSpace) {
CGColorSpaceRelease(mColorSpace);
mColorSpace = nullptr;
}
#endif
}
already_AddRefed<SourceSurface> DrawTargetSkia::Snapshot() {
// Without this lock, this could cause us to get out a snapshot and race with
// Snapshot::~Snapshot() actually destroying itself.
MutexAutoLock lock(mSnapshotLock);
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 = SkImage::MakeFromRaster(pixmap, nullptr, nullptr);
} else {
image = mSurface->makeImageSnapshot();
}
if (!snapshot->InitFromImage(image, mFormat, this)) {
return nullptr;
}
mSnapshot = snapshot;
}
return snapshot.forget();
}
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 SkImage::MakeFromRaster(subsetPixmap, ReleaseImage,
aImage.release());
}
return aImage->makeSubset(subsetRect);
}
static void FreeBitmapPixels(void* aBuf, void*) { sk_free(aBuf); }
static bool ExtractAlphaBitmap(const sk_sp<SkImage>& aImage,
SkBitmap* aResultBitmap) {
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 = SkAlign4(info.minRowBytes());
CheckedInt<size_t> size = stride;
size *= info.height();
if (size.isValid()) {
void* buf = sk_malloc_flags(size.value(), 0);
if (buf) {
SkBitmap bitmap;
if (bitmap.installPixels(info, buf, stride, FreeBitmapPixels, 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 sk_sp<SkImage> ExtractAlphaForSurface(SourceSurface* aSurface) {
sk_sp<SkImage> image = GetSkImageForSurface(aSurface);
if (!image) {
return nullptr;
}
if (image->isAlphaOnly()) {
return image;
}
SkBitmap bitmap;
if (!ExtractAlphaBitmap(image, &bitmap)) {
return nullptr;
}
// Mark the bitmap immutable so that it will be shared rather than copied.
bitmap.setImmutable();
return SkImage::MakeFromBitmap(bitmap);
}
static void SetPaintPattern(SkPaint& aPaint, const Pattern& aPattern,
Float aAlpha = 1.0,
const SkMatrix* aMatrix = nullptr,
const Rect* aBounds = nullptr) {
switch (aPattern.GetType()) {
case PatternType::COLOR: {
Color 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 =
static_cast<GradientStopsSkia*>(pat.mStops.get());
if (!stops || stops->mCount < 2 || !pat.mBegin.IsFinite() ||
!pat.mEnd.IsFinite() || pat.mBegin == pat.mEnd) {
aPaint.setColor(SK_ColorTRANSPARENT);
} else {
SkShader::TileMode 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 =
static_cast<GradientStopsSkia*>(pat.mStops.get());
if (!stops || stops->mCount < 2 || !pat.mCenter1.IsFinite() ||
!IsFinite(pat.mRadius1) || !pat.mCenter2.IsFinite() ||
!IsFinite(pat.mRadius2) ||
(pat.mCenter1 == pat.mCenter2 && pat.mRadius1 == pat.mRadius2)) {
aPaint.setColor(SK_ColorTRANSPARENT);
} else {
SkShader::TileMode 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::SURFACE: {
const SurfacePattern& pat = static_cast<const SurfacePattern&>(aPattern);
sk_sp<SkImage> image =
GetSkImageForSurface(pat.mSurface, 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);
mat.preTranslate(pat.mSamplingRect.X(), pat.mSamplingRect.Y());
}
SkShader::TileMode xTileMode =
ExtendModeToTileMode(pat.mExtendMode, Axis::X_AXIS);
SkShader::TileMode yTileMode =
ExtendModeToTileMode(pat.mExtendMode, Axis::Y_AXIS);
aPaint.setShader(image->makeShader(xTileMode, yTileMode, &mat));
if (pat.mSamplingFilter == SamplingFilter::POINT) {
aPaint.setFilterQuality(kNone_SkFilterQuality);
}
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, 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;
}
mPaint.setFilterQuality(kLow_SkFilterQuality);
}
// TODO: Maybe add an operator overload to access this easier?
SkPaint mPaint;
bool mNeedsRestore;
SkCanvas* mCanvas;
Float mAlpha;
};
void DrawTargetSkia::Flush() { mCanvas->flush(); }
void DrawTargetSkia::DrawSurface(SourceSurface* aSurface, const Rect& aDest,
const Rect& aSource,
const DrawSurfaceOptions& aSurfOptions,
const DrawOptions& aOptions) {
if (aSource.IsEmpty()) {
return;
}
MarkChanged();
sk_sp<SkImage> image = GetSkImageForSurface(aSurface);
if (!image) {
return;
}
SkRect destRect = RectToSkRect(aDest);
SkRect sourceRect = RectToSkRect(aSource);
bool forceGroup =
image->isAlphaOnly() && aOptions.mCompositionOp != CompositionOp::OP_OVER;
AutoPaintSetup paint(mCanvas, aOptions, &aDest, forceGroup);
if (aSurfOptions.mSamplingFilter == SamplingFilter::POINT) {
paint.mPaint.setFilterQuality(kNone_SkFilterQuality);
}
mCanvas->drawImageRect(image, sourceRect, destRect, &paint.mPaint);
}
DrawTargetType DrawTargetSkia::GetType() const {
return DrawTargetType::SOFTWARE_RASTER;
}
void DrawTargetSkia::DrawFilter(FilterNode* aNode, const Rect& aSourceRect,
const Point& aDestPoint,
const DrawOptions& aOptions) {
FilterNodeSoftware* filter = static_cast<FilterNodeSoftware*>(aNode);
filter->Draw(this, aSourceRect, aDestPoint, aOptions);
}
void DrawTargetSkia::DrawSurfaceWithShadow(SourceSurface* aSurface,
const Point& aDest,
const Color& aColor,
const Point& aOffset, Float aSigma,
CompositionOp aOperator) {
if (aSurface->GetSize().IsEmpty()) {
return;
}
MarkChanged();
sk_sp<SkImage> image = GetSkImageForSurface(aSurface);
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 + aOffset);
SkBitmap blurMask;
if (ExtractAlphaBitmap(image, &blurMask)) {
// 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()), aSigma, aSigma);
blur.Blur(reinterpret_cast<uint8_t*>(blurMask.getPixels()));
blurMask.notifyPixelsChanged();
shadowPaint.setColor(ColorToSkColor(aColor, 1.0f));
mCanvas->drawBitmap(blurMask, shadowDest.x, shadowDest.y, &shadowPaint);
} else {
sk_sp<SkImageFilter> blurFilter(
SkBlurImageFilter::Make(aSigma, aSigma, nullptr));
sk_sp<SkColorFilter> colorFilter(SkColorFilter::MakeModeFilter(
ColorToSkColor(aColor, 1.0f), SkBlendMode::kSrcIn));
shadowPaint.setImageFilter(blurFilter);
shadowPaint.setColorFilter(colorFilter);
mCanvas->drawImage(image, shadowDest.x, shadowDest.y, &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, &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);
}
bool DrawTargetSkia::ShouldLCDRenderText(FontType aFontType,
AntialiasMode aAntialiasMode) {
// Only allow subpixel AA if explicitly permitted.
if (!GetPermitSubpixelAA()) {
return false;
}
if (aAntialiasMode == AntialiasMode::DEFAULT) {
switch (aFontType) {
case FontType::MAC:
case FontType::GDI:
case FontType::DWRITE:
case FontType::FONTCONFIG:
return true;
case FontType::FREETYPE:
default:
// TODO: Figure out what to do for the other platforms.
return false;
}
}
return (aAntialiasMode == AntialiasMode::SUBPIXEL);
}
#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