gecko-dev/gfx/2d/DrawTargetCairo.h

263 строки
10 KiB
C++

/* -*- 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/. */
#ifndef _MOZILLA_GFX_DRAWTARGET_CAIRO_H_
#define _MOZILLA_GFX_DRAWTARGET_CAIRO_H_
#include "2D.h"
#include "cairo.h"
#include "PathCairo.h"
#include <vector>
namespace mozilla {
namespace gfx {
class SourceSurfaceCairo;
class GradientStopsCairo : public GradientStops
{
public:
MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(GradientStopsCairo)
GradientStopsCairo(GradientStop* aStops, uint32_t aNumStops,
ExtendMode aExtendMode)
: mExtendMode(aExtendMode)
{
for (uint32_t i = 0; i < aNumStops; ++i) {
mStops.push_back(aStops[i]);
}
}
virtual ~GradientStopsCairo() {}
const std::vector<GradientStop>& GetStops() const
{
return mStops;
}
ExtendMode GetExtendMode() const
{
return mExtendMode;
}
virtual BackendType GetBackendType() const { return BackendType::CAIRO; }
private:
std::vector<GradientStop> mStops;
ExtendMode mExtendMode;
};
class DrawTargetCairo final : public DrawTarget
{
public:
MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(DrawTargetCairo, override)
friend class BorrowedCairoContext;
friend class BorrowedXlibDrawable;
DrawTargetCairo();
virtual ~DrawTargetCairo();
virtual bool IsValid() const override;
virtual DrawTargetType GetType() const override;
virtual BackendType GetBackendType() const override { return BackendType::CAIRO; }
virtual already_AddRefed<SourceSurface> Snapshot() override;
virtual IntSize GetSize() override;
virtual bool IsCurrentGroupOpaque() override;
virtual void SetPermitSubpixelAA(bool aPermitSubpixelAA) override;
virtual bool LockBits(uint8_t** aData, IntSize* aSize,
int32_t* aStride, SurfaceFormat* aFormat,
IntPoint* aOrigin = nullptr) override;
virtual void ReleaseBits(uint8_t* aData) override;
virtual void Flush() override;
virtual void DrawSurface(SourceSurface *aSurface,
const Rect &aDest,
const Rect &aSource,
const DrawSurfaceOptions &aSurfOptions = DrawSurfaceOptions(),
const DrawOptions &aOptions = DrawOptions()) override;
virtual void DrawFilter(FilterNode *aNode,
const Rect &aSourceRect,
const Point &aDestPoint,
const DrawOptions &aOptions = DrawOptions()) override;
virtual void DrawSurfaceWithShadow(SourceSurface *aSurface,
const Point &aDest,
const Color &aColor,
const Point &aOffset,
Float aSigma,
CompositionOp aOperator) override;
virtual void ClearRect(const Rect &aRect) override;
virtual void CopySurface(SourceSurface *aSurface,
const IntRect &aSourceRect,
const IntPoint &aDestination) override;
virtual void CopyRect(const IntRect &aSourceRect,
const IntPoint &aDestination) override;
virtual void FillRect(const Rect &aRect,
const Pattern &aPattern,
const DrawOptions &aOptions = DrawOptions()) override;
virtual void StrokeRect(const Rect &aRect,
const Pattern &aPattern,
const StrokeOptions &aStrokeOptions = StrokeOptions(),
const DrawOptions &aOptions = DrawOptions()) override;
virtual void StrokeLine(const Point &aStart,
const Point &aEnd,
const Pattern &aPattern,
const StrokeOptions &aStrokeOptions = StrokeOptions(),
const DrawOptions &aOptions = DrawOptions()) override;
virtual void Stroke(const Path *aPath,
const Pattern &aPattern,
const StrokeOptions &aStrokeOptions = StrokeOptions(),
const DrawOptions &aOptions = DrawOptions()) override;
virtual void Fill(const Path *aPath,
const Pattern &aPattern,
const DrawOptions &aOptions = DrawOptions()) override;
virtual void FillGlyphs(ScaledFont *aFont,
const GlyphBuffer &aBuffer,
const Pattern &aPattern,
const DrawOptions &aOptions) override;
virtual void Mask(const Pattern &aSource,
const Pattern &aMask,
const DrawOptions &aOptions = DrawOptions()) override;
virtual void MaskSurface(const Pattern &aSource,
SourceSurface *aMask,
Point aOffset,
const DrawOptions &aOptions = DrawOptions()) override;
virtual bool Draw3DTransformedSurface(SourceSurface* aSurface,
const Matrix4x4& aMatrix) override;
virtual void PushClip(const Path *aPath) override;
virtual void PushClipRect(const Rect &aRect) override;
virtual void PopClip() override;
virtual void PushLayer(bool aOpaque, Float aOpacity,
SourceSurface* aMask,
const Matrix& aMaskTransform,
const IntRect& aBounds = IntRect(),
bool aCopyBackground = false) override;
virtual void PopLayer() override;
virtual already_AddRefed<PathBuilder> CreatePathBuilder(FillRule aFillRule = FillRule::FILL_WINDING) const override;
virtual already_AddRefed<SourceSurface> CreateSourceSurfaceFromData(unsigned char *aData,
const IntSize &aSize,
int32_t aStride,
SurfaceFormat aFormat) const override;
virtual already_AddRefed<SourceSurface> OptimizeSourceSurface(SourceSurface *aSurface) const override;
virtual already_AddRefed<SourceSurface>
CreateSourceSurfaceFromNativeSurface(const NativeSurface &aSurface) const override;
virtual already_AddRefed<DrawTarget>
CreateSimilarDrawTarget(const IntSize &aSize, SurfaceFormat aFormat) const override;
virtual already_AddRefed<DrawTarget>
CreateShadowDrawTarget(const IntSize &aSize, SurfaceFormat aFormat,
float aSigma) const override;
virtual already_AddRefed<GradientStops>
CreateGradientStops(GradientStop *aStops,
uint32_t aNumStops,
ExtendMode aExtendMode = ExtendMode::CLAMP) const override;
virtual already_AddRefed<FilterNode> CreateFilter(FilterType aType) override;
virtual void GetGlyphRasterizationMetrics(ScaledFont *aScaledFont, const uint16_t* aGlyphIndices,
uint32_t aNumGlyphs, GlyphMetrics* aGlyphMetrics) override;
virtual void *GetNativeSurface(NativeSurfaceType aType) override;
bool Init(cairo_surface_t* aSurface, const IntSize& aSize, SurfaceFormat* aFormat = nullptr);
bool Init(const IntSize& aSize, SurfaceFormat aFormat);
bool Init(unsigned char* aData, const IntSize &aSize, int32_t aStride, SurfaceFormat aFormat);
virtual void SetTransform(const Matrix& aTransform) override;
virtual void DetachAllSnapshots() override { MarkSnapshotIndependent(); }
// Call to set up aContext for drawing (with the current transform, etc).
// Pass the path you're going to be using if you have one.
// Implicitly calls WillChange(aPath).
void PrepareForDrawing(cairo_t* aContext, const Path* aPath = nullptr);
static cairo_surface_t *GetDummySurface();
// Cairo hardcodes this as its maximum surface size.
static size_t GetMaxSurfaceSize() {
return 32767;
}
private: // methods
// Init cairo surface without doing a cairo_surface_reference() call.
bool InitAlreadyReferenced(cairo_surface_t* aSurface, const IntSize& aSize, SurfaceFormat* aFormat = nullptr);
enum DrawPatternType { DRAW_FILL, DRAW_STROKE };
void DrawPattern(const Pattern& aPattern,
const StrokeOptions& aStrokeOptions,
const DrawOptions& aOptions,
DrawPatternType aDrawType,
bool aPathBoundsClip = false);
void CopySurfaceInternal(cairo_surface_t* aSurface,
const IntRect& aSource,
const IntPoint& aDest);
Rect GetUserSpaceClip();
// Call before you make any changes to the backing surface with which this
// context is associated. Pass the path you're going to be using if you have
// one.
void WillChange(const Path* aPath = nullptr);
// Call if there is any reason to disassociate the snapshot from this draw
// target; for example, because we're going to be destroyed.
void MarkSnapshotIndependent();
// If the current operator is "source" then clear the destination before we
// draw into it, to simulate the effect of an unbounded source operator.
void ClearSurfaceForUnboundedSource(const CompositionOp &aOperator);
// Set the Cairo context font options according to the current draw target
// font state.
void SetFontOptions();
private: // data
cairo_t* mContext;
cairo_surface_t* mSurface;
IntSize mSize;
bool mTransformSingular;
uint8_t* mLockedBits;
cairo_font_options_t* mFontOptions;
struct PushedLayer
{
PushedLayer(Float aOpacity, bool aWasPermittingSubpixelAA)
: mOpacity(aOpacity)
, mMaskPattern(nullptr)
, mWasPermittingSubpixelAA(aWasPermittingSubpixelAA)
{}
Float mOpacity;
cairo_pattern_t* mMaskPattern;
bool mWasPermittingSubpixelAA;
};
std::vector<PushedLayer> mPushedLayers;
// The latest snapshot of this surface. This needs to be told when this
// target is modified. We keep it alive as a cache.
RefPtr<SourceSurfaceCairo> mSnapshot;
static cairo_surface_t *mDummySurface;
};
} // namespace gfx
} // namespace mozilla
#endif // _MOZILLA_GFX_DRAWTARGET_CAIRO_H_