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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 "GrFragmentProcessor.h"
#include "GrCoordTransform.h"
#include "GrInvariantOutput.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 GrFragmentProcessor {
public:
virtual ~GrSingleTextureEffect();
protected:
/** unfiltered, clamp mode */
GrSingleTextureEffect(GrTexture*, const SkMatrix&, GrCoordSet = kLocal_GrCoordSet);
/** clamp mode */
GrSingleTextureEffect(GrTexture*, const SkMatrix&, GrTextureParams::FilterMode filterMode,
GrCoordSet = kLocal_GrCoordSet);
GrSingleTextureEffect(GrTexture*,
const SkMatrix&,
const GrTextureParams&,
GrCoordSet = kLocal_GrCoordSet);
/**
* Can be used as a helper to implement subclass onComputeInvariantOutput(). It assumes that
* the subclass output color will be a modulation of the input color with a value read from the
* texture.
*/
void updateInvariantOutputForModulation(GrInvariantOutput* inout) const {
if (GrPixelConfigIsAlphaOnly(this->texture(0)->config())) {
inout->mulByUnknownSingleComponent();
} else if (GrPixelConfigIsOpaque(this->texture(0)->config())) {
inout->mulByUnknownOpaqueFourComponents();
} else {
inout->mulByUnknownFourComponents();
}
}
private:
GrCoordTransform fCoordTransform;
GrTextureAccess fTextureAccess;
typedef GrFragmentProcessor INHERITED;
};
#endif
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