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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrSingleTextureEffect_DEFINED
#define GrSingleTextureEffect_DEFINED
#include "GrEffect.h"
#include "SkMatrix.h"
class GrTexture;
/**
* A base class for effects that draw a single texture with a texture matrix. This effect has no
* backend implementations. One must be provided by the subclass.
*/
class GrSingleTextureEffect : public GrEffect {
public:
virtual ~GrSingleTextureEffect();
const SkMatrix& getMatrix() const { return fMatrix; }
/** Indicates whether the matrix operates on local coords or positions */
CoordsType coordsType() const { return fCoordsType; }
protected:
/** unfiltered, clamp mode */
GrSingleTextureEffect(GrTexture*, const SkMatrix&, CoordsType = kLocal_CoordsType);
/** clamp mode */
GrSingleTextureEffect(GrTexture*, const SkMatrix&, bool bilerp, CoordsType = kLocal_CoordsType);
GrSingleTextureEffect(GrTexture*,
const SkMatrix&,
const GrTextureParams&,
CoordsType = kLocal_CoordsType);
/**
* Helper for subclass onIsEqual() functions.
*/
bool hasSameTextureParamsMatrixAndCoordsType(const GrSingleTextureEffect& other) const {
const GrTextureAccess& otherAccess = other.fTextureAccess;
// We don't have to check the accesses' swizzles because they are inferred from the texture.
return fTextureAccess.getTexture() == otherAccess.getTexture() &&
fTextureAccess.getParams() == otherAccess.getParams() &&
this->getMatrix().cheapEqualTo(other.getMatrix()) &&
fCoordsType == other.fCoordsType;
}
/**
* Can be used as a helper to implement subclass getConstantColorComponents(). It assumes that
* the subclass output color will be a modulation of the input color with a value read from the
* texture.
*/
void updateConstantColorComponentsForModulation(GrColor* color, uint32_t* validFlags) const {
if ((*validFlags & kA_GrColorComponentFlag) && 0xFF == GrColorUnpackA(*color) &&
GrPixelConfigIsOpaque(this->texture(0)->config())) {
*validFlags = kA_GrColorComponentFlag;
} else {
*validFlags = 0;
}
}
private:
GrTextureAccess fTextureAccess;
SkMatrix fMatrix;
CoordsType fCoordsType;
typedef GrEffect INHERITED;
};
#endif
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