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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkPictureShader_DEFINED
#define SkPictureShader_DEFINED
#include "SkAtomics.h"
#include "SkShaderBase.h"
class SkArenaAlloc;
class SkBitmap;
class SkPicture;
/*
* An SkPictureShader can be used to draw SkPicture-based patterns.
*
* The SkPicture is first rendered into a tile, which is then used to shade the area according
* to specified tiling rules.
*/
class SkPictureShader : public SkShaderBase {
public:
~SkPictureShader() override;
static sk_sp<SkShader> Make(sk_sp<SkPicture>, TileMode, TileMode, const SkMatrix*,
const SkRect*);
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkPictureShader)
#if SK_SUPPORT_GPU
std::unique_ptr<GrFragmentProcessor> asFragmentProcessor(const GrFPArgs&) const override;
#endif
protected:
SkPictureShader(SkReadBuffer&);
void flatten(SkWriteBuffer&) const override;
bool onAppendStages(const StageRec&) const override;
Context* onMakeContext(const ContextRec&, SkArenaAlloc*) const override;
sk_sp<SkShader> onMakeColorSpace(SkColorSpaceXformer* xformer) const override;
private:
SkPictureShader(sk_sp<SkPicture>, TileMode, TileMode, const SkMatrix*, const SkRect*,
sk_sp<SkColorSpace>);
sk_sp<SkShader> refBitmapShader(const SkMatrix&, SkTCopyOnFirstWrite<SkMatrix>* localMatrix,
SkColorSpace* dstColorSpace,
const int maxTextureSize = 0) const;
class PictureShaderContext : public Context {
public:
PictureShaderContext(
const SkPictureShader&, const ContextRec&, sk_sp<SkShader> bitmapShader, SkArenaAlloc*);
uint32_t getFlags() const override;
void shadeSpan(int x, int y, SkPMColor dstC[], int count) override;
sk_sp<SkShader> fBitmapShader;
SkShaderBase::Context* fBitmapShaderContext;
void* fBitmapShaderContextStorage;
typedef Context INHERITED;
};
sk_sp<SkPicture> fPicture;
SkRect fTile;
TileMode fTmx, fTmy;
// Should never be set by a public constructor. This is only used when onMakeColorSpace()
// forces a deferred color space xform.
sk_sp<SkColorSpace> fColorSpace;
const uint32_t fUniqueID;
mutable SkAtomic<bool> fAddedToCache;
typedef SkShaderBase INHERITED;
};
#endif // SkPictureShader_DEFINED
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