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