7dd3bbda13
Even though glyph masks are stored without any baked-in color, the blending weights they represent are preblended so as to be gamma-aware on macOS and Windows. That means the color requested for the glyph alters the mask itself. It is not sufficient to store a single mask that can be used for any color, rather, there must be different masks stored for each potential preblend ramp that is generated by Skia. Skia uses a quantization scheme where only the high bits of the color are used to generate the preblend ramp so as to minimize the number of tables generated, so we do our best to mimic that scheme and avoid generating an excessive number of masks. This allows reuse of masks for some subset of colors, albeit not every color. However, coaxing Skia into generating preblended masks without baking in the final rasterized color requires some subversive use of SkShader to alter the queried luminance color without changing the actual color of an SkPaint. An alternative invasive approach would be to modify Skia to support this via a flag in SkPaint directly, but that would require patching Skia directly, which might be necessary in the future should SkShader become deprecated. Differential Revision: https://phabricator.services.mozilla.com/D219242
220 lines
9.3 KiB
C++
220 lines
9.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef _MOZILLA_GFX_DRAWTARGETSKIA_H
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#define _MOZILLA_GFX_DRAWTARGETSKIA_H
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#include "2D.h"
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#include <sstream>
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#include <vector>
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#ifdef MOZ_WIDGET_COCOA
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# include <ApplicationServices/ApplicationServices.h>
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#endif
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class SkCanvas;
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class SkShader;
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class SkSurface;
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namespace mozilla {
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template <>
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class RefPtrTraits<SkSurface> {
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public:
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static void Release(SkSurface* aSurface);
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static void AddRef(SkSurface* aSurface);
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};
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namespace gfx {
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class DataSourceSurface;
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class SourceSurfaceSkia;
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class BorrowedCGContext;
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class DrawTargetSkia : public DrawTarget {
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public:
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MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(DrawTargetSkia, override)
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DrawTargetSkia();
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virtual ~DrawTargetSkia();
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virtual DrawTargetType GetType() const override;
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virtual BackendType GetBackendType() const override {
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return BackendType::SKIA;
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}
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already_AddRefed<SourceSurface> Snapshot(SurfaceFormat aFormat);
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virtual already_AddRefed<SourceSurface> Snapshot() override {
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return Snapshot(mFormat);
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}
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already_AddRefed<SourceSurface> GetBackingSurface() override;
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virtual IntSize GetSize() const override { return mSize; };
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virtual bool LockBits(uint8_t** aData, IntSize* aSize, int32_t* aStride,
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SurfaceFormat* aFormat,
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IntPoint* aOrigin = nullptr) override;
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virtual void ReleaseBits(uint8_t* aData) override;
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virtual void Flush() override;
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virtual void DrawSurface(
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SourceSurface* aSurface, const Rect& aDest, const Rect& aSource,
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const DrawSurfaceOptions& aSurfOptions = DrawSurfaceOptions(),
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const DrawOptions& aOptions = DrawOptions()) override;
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virtual void DrawFilter(FilterNode* aNode, const Rect& aSourceRect,
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const Point& aDestPoint,
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const DrawOptions& aOptions = DrawOptions()) override;
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virtual void DrawSurfaceWithShadow(SourceSurface* aSurface,
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const Point& aDest,
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const ShadowOptions& aShadow,
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CompositionOp aOperator) override;
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virtual void ClearRect(const Rect& aRect) override;
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virtual void CopySurface(SourceSurface* aSurface, const IntRect& aSourceRect,
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const IntPoint& aDestination) override;
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virtual void FillRect(const Rect& aRect, const Pattern& aPattern,
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const DrawOptions& aOptions = DrawOptions()) override;
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virtual void StrokeRect(const Rect& aRect, const Pattern& aPattern,
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const StrokeOptions& aStrokeOptions = StrokeOptions(),
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const DrawOptions& aOptions = DrawOptions()) override;
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virtual void StrokeLine(const Point& aStart, const Point& aEnd,
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const Pattern& aPattern,
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const StrokeOptions& aStrokeOptions = StrokeOptions(),
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const DrawOptions& aOptions = DrawOptions()) override;
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virtual void Stroke(const Path* aPath, const Pattern& aPattern,
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const StrokeOptions& aStrokeOptions = StrokeOptions(),
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const DrawOptions& aOptions = DrawOptions()) override;
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virtual void Fill(const Path* aPath, const Pattern& aPattern,
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const DrawOptions& aOptions = DrawOptions()) override;
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virtual void FillGlyphs(ScaledFont* aFont, const GlyphBuffer& aBuffer,
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const Pattern& aPattern,
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const DrawOptions& aOptions = DrawOptions()) override;
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virtual void StrokeGlyphs(
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ScaledFont* aFont, const GlyphBuffer& aBuffer, const Pattern& aPattern,
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const StrokeOptions& aStrokeOptions = StrokeOptions(),
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const DrawOptions& aOptions = DrawOptions()) override;
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virtual void Mask(const Pattern& aSource, const Pattern& aMask,
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const DrawOptions& aOptions = DrawOptions()) override;
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virtual void MaskSurface(
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const Pattern& aSource, SourceSurface* aMask, Point aOffset,
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const DrawOptions& aOptions = DrawOptions()) override;
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virtual bool Draw3DTransformedSurface(SourceSurface* aSurface,
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const Matrix4x4& aMatrix) override;
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virtual void PushClip(const Path* aPath) override;
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virtual void PushClipRect(const Rect& aRect) override;
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virtual void PushDeviceSpaceClipRects(const IntRect* aRects,
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uint32_t aCount) override;
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virtual void PopClip() override;
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virtual bool RemoveAllClips() override;
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virtual void PushLayer(bool aOpaque, Float aOpacity, SourceSurface* aMask,
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const Matrix& aMaskTransform,
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const IntRect& aBounds = IntRect(),
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bool aCopyBackground = false) override;
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virtual void PushLayerWithBlend(
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bool aOpaque, Float aOpacity, SourceSurface* aMask,
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const Matrix& aMaskTransform, const IntRect& aBounds = IntRect(),
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bool aCopyBackground = false,
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CompositionOp aCompositionOp = CompositionOp::OP_OVER) override;
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virtual void PopLayer() override;
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virtual already_AddRefed<SourceSurface> CreateSourceSurfaceFromData(
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unsigned char* aData, const IntSize& aSize, int32_t aStride,
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SurfaceFormat aFormat) const override;
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virtual already_AddRefed<SourceSurface> OptimizeSourceSurface(
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SourceSurface* aSurface) const override;
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virtual already_AddRefed<SourceSurface> OptimizeSourceSurfaceForUnknownAlpha(
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SourceSurface* aSurface) const override;
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virtual already_AddRefed<SourceSurface> CreateSourceSurfaceFromNativeSurface(
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const NativeSurface& aSurface) const override;
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virtual already_AddRefed<DrawTarget> CreateSimilarDrawTarget(
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const IntSize& aSize, SurfaceFormat aFormat) const override;
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virtual bool CanCreateSimilarDrawTarget(const IntSize& aSize,
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SurfaceFormat aFormat) const override;
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virtual RefPtr<DrawTarget> CreateClippedDrawTarget(
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const Rect& aBounds, SurfaceFormat aFormat) override;
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virtual already_AddRefed<PathBuilder> CreatePathBuilder(
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FillRule aFillRule = FillRule::FILL_WINDING) const override;
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virtual already_AddRefed<GradientStops> CreateGradientStops(
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GradientStop* aStops, uint32_t aNumStops,
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ExtendMode aExtendMode = ExtendMode::CLAMP) const override;
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virtual already_AddRefed<FilterNode> CreateFilter(FilterType aType) override;
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virtual void SetTransform(const Matrix& aTransform) override;
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virtual void* GetNativeSurface(NativeSurfaceType aType) override;
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virtual void DetachAllSnapshots() override { MarkChanged(); }
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bool Init(const IntSize& aSize, SurfaceFormat aFormat);
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bool Init(unsigned char* aData, const IntSize& aSize, int32_t aStride,
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SurfaceFormat aFormat, bool aUninitialized = false);
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bool Init(SkCanvas* aCanvas);
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bool Init(RefPtr<DataSourceSurface>&& aSurface);
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// Skia assumes that texture sizes fit in 16-bit signed integers.
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static size_t GetMaxSurfaceSize() { return 32767; }
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operator std::string() const {
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std::stringstream stream;
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stream << "DrawTargetSkia(" << this << ")";
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return stream.str();
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}
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Maybe<IntRect> GetDeviceClipRect(bool aAllowComplex = false) const;
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Maybe<Rect> GetGlyphLocalBounds(ScaledFont* aFont, const GlyphBuffer& aBuffer,
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const Pattern& aPattern,
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const StrokeOptions* aStrokeOptions,
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const DrawOptions& aOptions);
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void DrawGlyphMask(ScaledFont* aFont, const GlyphBuffer& aBuffer,
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const DeviceColor& aColor,
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const StrokeOptions* aStrokeOptions = nullptr,
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const DrawOptions& aOptions = DrawOptions());
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private:
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friend class SourceSurfaceSkia;
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static void ReleaseMappedSkSurface(void* aPixels, void* aContext);
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void MarkChanged();
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void DrawGlyphs(ScaledFont* aFont, const GlyphBuffer& aBuffer,
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const Pattern& aPattern,
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const StrokeOptions* aStrokeOptions = nullptr,
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const DrawOptions& aOptions = DrawOptions(),
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SkShader* aShader = nullptr);
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struct PushedLayer {
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PushedLayer(bool aOldPermitSubpixelAA, SourceSurface* aMask)
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: mOldPermitSubpixelAA(aOldPermitSubpixelAA), mMask(aMask) {}
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bool mOldPermitSubpixelAA;
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RefPtr<SourceSurface> mMask;
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};
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std::vector<PushedLayer> mPushedLayers;
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IntSize mSize;
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RefPtr<SkSurface> mSurface;
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SkCanvas* mCanvas = nullptr;
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RefPtr<DataSourceSurface> mBackingSurface;
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RefPtr<SourceSurfaceSkia> mSnapshot;
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Mutex mSnapshotLock MOZ_UNANNOTATED;
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#ifdef MOZ_WIDGET_COCOA
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friend class BorrowedCGContext;
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CGContextRef BorrowCGContext(const DrawOptions& aOptions);
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void ReturnCGContext(CGContextRef);
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bool FillGlyphsWithCG(ScaledFont* aFont, const GlyphBuffer& aBuffer,
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const Pattern& aPattern,
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const DrawOptions& aOptions = DrawOptions());
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CGContextRef mCG;
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CGColorSpaceRef mColorSpace;
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uint8_t* mCanvasData;
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IntSize mCGSize;
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bool mNeedLayer;
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#endif
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};
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} // namespace gfx
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} // namespace mozilla
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#endif // _MOZILLA_GFX_SOURCESURFACESKIA_H
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