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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 "SkImageInfo.h"
#include "SkRefCnt.h"
class SkColorSpace;
class SkMatrix44;
/**
* Represents a color gamut transformation (as a 4x4 color matrix)
*/
class GrColorSpaceXform : public SkRefCnt {
public:
GrColorSpaceXform(const SkMatrix44& srcToDst, SkAlphaType srcAlphaType);
static sk_sp<GrColorSpaceXform> Make(SkColorSpace* src, SkColorSpace* dst,
SkAlphaType srcAlphaType);
const float* srcToDst() { return fSrcToDst; }
SkAlphaType alphaType() const { return fSrcAlphaType; }
/**
* GrGLSLFragmentProcessor::GenKey() must call this and include the returned value in its
* computed key.
*/
static uint32_t XformKey(GrColorSpaceXform* xform) {
if (!xform) {
return 0;
}
// Code generation just depends on whether the alpha type is premul or not
return kPremul_SkAlphaType == xform->fSrcAlphaType ? 1 : 2;
}
private:
// We store the column-major form of the srcToDst matrix, for easy uploading to uniforms
float fSrcToDst[16];
// Alpha type of the source. If it's premul, we need special handling
SkAlphaType fSrcAlphaType;
};
#endif
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