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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkEmptyShader_DEFINED
#define SkEmptyShader_DEFINED
#include "SkShader.h"
/**
* \class SkEmptyShader
* A Shader that always draws nothing. Its setContext always returns false,
* so it never expects that its shadeSpan() methods will get called.
*/
class SK_API SkEmptyShader : public SkShader {
public:
SkEmptyShader() {}
virtual uint32_t getFlags() SK_OVERRIDE;
virtual uint8_t getSpan16Alpha() const SK_OVERRIDE;
virtual bool setContext(const SkBitmap&, const SkPaint&,
const SkMatrix&) SK_OVERRIDE;
virtual void shadeSpan(int x, int y, SkPMColor span[], int count) SK_OVERRIDE;
virtual void shadeSpan16(int x, int y, uint16_t span[], int count) SK_OVERRIDE;
virtual void shadeSpanAlpha(int x, int y, uint8_t alpha[], int count) SK_OVERRIDE;
protected:
SkEmptyShader(SkFlattenableReadBuffer&);
virtual Factory getFactory() SK_OVERRIDE;
virtual void flatten(SkFlattenableWriteBuffer&) SK_OVERRIDE;
private:
typedef SkShader INHERITED;
};
#endif
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