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/*
* Copyright 2007 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkColorShader_DEFINED
#define SkColorShader_DEFINED
#include "SkShader.h"
/** \class SkColorShader
A Shader that represents a single color. In general, this effect can be
accomplished by just using the color field on the paint, but if an
actual shader object is needed, this provides that feature.
*/
class SK_API SkColorShader : public SkShader {
public:
/** Create a ColorShader that ignores the color in the paint, and uses the
specified color. Note: like all shaders, at draw time the paint's alpha
will be respected, and is applied to the specified color.
*/
explicit SkColorShader(SkColor c);
virtual bool isOpaque() const SK_OVERRIDE;
virtual size_t contextSize() const SK_OVERRIDE {
return sizeof(ColorShaderContext);
}
class ColorShaderContext : public SkShader::Context {
public:
ColorShaderContext(const SkColorShader& shader, const ContextRec&);
virtual uint32_t getFlags() const SK_OVERRIDE;
virtual uint8_t getSpan16Alpha() const 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;
private:
SkPMColor fPMColor;
uint32_t fFlags;
uint16_t fColor16;
typedef SkShader::Context INHERITED;
};
// we return false for this, use asAGradient
virtual BitmapType asABitmap(SkBitmap* outTexture,
SkMatrix* outMatrix,
TileMode xy[2]) const SK_OVERRIDE;
virtual GradientType asAGradient(GradientInfo* info) const SK_OVERRIDE;
virtual bool asFragmentProcessor(GrContext*, const SkPaint&, const SkMatrix*, GrColor*,
GrFragmentProcessor**) const SK_OVERRIDE;
SK_TO_STRING_OVERRIDE()
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkColorShader)
protected:
SkColorShader(SkReadBuffer&);
virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
virtual Context* onCreateContext(const ContextRec&, void* storage) const SK_OVERRIDE;
virtual bool onAsLuminanceColor(SkColor* lum) const SK_OVERRIDE {
*lum = fColor;
return true;
}
private:
SkColor fColor;
typedef SkShader INHERITED;
};
#endif
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