skia2/include/gpu/effects/GrExtractAlphaFragmentProcessor.h

46 lines
1.4 KiB
C++

/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrExtractAlphaFragmentProcessor_DEFINED
#define GrExtractAlphaFragmentProcessor_DEFINED
#include "GrFragmentProcessor.h"
/** This processor extracts the incoming color's alpha, ignores r, g, and b, and feeds
the replicated alpha to it's inner processor. */
class GrExtractAlphaFragmentProcessor : public GrFragmentProcessor {
public:
static GrFragmentProcessor* Create(const GrFragmentProcessor* processor) {
if (!processor) {
return nullptr;
}
return SkNEW_ARGS(GrExtractAlphaFragmentProcessor, (processor));
}
~GrExtractAlphaFragmentProcessor() override {}
const char* name() const override { return "Extract Alpha"; }
private:
GrExtractAlphaFragmentProcessor(const GrFragmentProcessor* processor) {
this->initClassID<GrExtractAlphaFragmentProcessor>();
this->registerChildProcessor(processor);
}
GrGLFragmentProcessor* onCreateGLInstance() const override;
void onGetGLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override;
bool onIsEqual(const GrFragmentProcessor&) const override;
void onComputeInvariantOutput(GrInvariantOutput* inout) const override;
typedef GrFragmentProcessor INHERITED;
};
#endif