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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrColorSpaceXform_DEFINED
#define GrColorSpaceXform_DEFINED
#include "GrColor.h"
#include "GrFragmentProcessor.h"
#include "SkColorSpaceXformSteps.h"
#include "SkRefCnt.h"
class SkColorSpace;
/**
* Represents a color space transformation
*/
class GrColorSpaceXform : public SkRefCnt {
public:
GrColorSpaceXform(const SkColorSpaceXformSteps& steps) : fSteps(steps) {}
static sk_sp<GrColorSpaceXform> Make(SkColorSpace* src, SkColorSpace* dst);
static sk_sp<GrColorSpaceXform> MakeUnpremulToUnpremul(SkColorSpace* src, SkColorSpace* dst);
const SkColorSpaceXformSteps& steps() const { return fSteps; }
/**
* GrGLSLFragmentProcessor::GenKey() must call this and include the returned value in its
* computed key.
*/
static uint32_t XformKey(const GrColorSpaceXform* xform) {
// Code generation depends on which steps we apply
return xform ? xform->fSteps.flags.mask() : 0;
}
static bool Equals(const GrColorSpaceXform* a, const GrColorSpaceXform* b);
GrColor4f apply(const GrColor4f& srcColor);
private:
friend class GrGLSLColorSpaceXformHelper;
SkColorSpaceXformSteps fSteps;
};
class GrColorSpaceXformEffect : public GrFragmentProcessor {
public:
/**
* Returns a fragment processor that converts the input's color space from src to dst.
*/
static std::unique_ptr<GrFragmentProcessor> Make(SkColorSpace* src, SkColorSpace* dst);
/**
* Returns a fragment processor that calls the passed in fragment processor, and then converts
* the color space of the output from src to dst.
*/
static std::unique_ptr<GrFragmentProcessor> Make(std::unique_ptr<GrFragmentProcessor> child,
SkColorSpace* src, SkColorSpace* dst);
const char* name() const override { return "ColorSpaceXform"; }
std::unique_ptr<GrFragmentProcessor> clone() const override;
const GrColorSpaceXform* colorXform() const { return fColorXform.get(); }
private:
GrColorSpaceXformEffect(std::unique_ptr<GrFragmentProcessor> child,
sk_sp<GrColorSpaceXform> colorXform);
static OptimizationFlags OptFlags(const GrFragmentProcessor* child);
GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
void onGetGLSLProcessorKey(const GrShaderCaps&, GrProcessorKeyBuilder*) const override;
bool onIsEqual(const GrFragmentProcessor&) const override;
sk_sp<GrColorSpaceXform> fColorXform;
typedef GrFragmentProcessor INHERITED;
};
#endif
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