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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 "SkColorSpace.h"
#include "SkMatrix44.h"
#include "SkRefCnt.h"
/**
* Represents a color space transformation
*/
class GrColorSpaceXform : public SkRefCnt {
public:
GrColorSpaceXform(const SkColorSpaceTransferFn&, const SkMatrix44&, uint32_t);
static sk_sp<GrColorSpaceXform> Make(const SkColorSpace* src,
GrPixelConfig srcConfig,
const SkColorSpace* dst);
static sk_sp<GrColorSpaceXform> MakeGamutXform(const SkColorSpace* src,
const SkColorSpace* dst) {
auto result = Make(src, kUnknown_GrPixelConfig, dst);
SkASSERT(!result || 0 == (result->fFlags & ~kApplyGamutXform_Flag));
return result;
}
const SkColorSpaceTransferFn& transferFn() const { return fSrcTransferFn; }
const float* transferFnCoeffs() const {
static_assert(0 == offsetof(SkColorSpaceTransferFn, fG), "TransferFn layout");
return &fSrcTransferFn.fG;
}
const SkMatrix44& gamutXform() const { return fGamutXform; }
/**
* 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 (as encoded by fFlags)
return SkToBool(xform) ? xform->fFlags : 0;
}
static bool Equals(const GrColorSpaceXform* a, const GrColorSpaceXform* b);
GrColor4f unclampedXform(const GrColor4f& srcColor);
GrColor4f clampedXform(const GrColor4f& srcColor);
private:
friend class GrGLSLColorSpaceXformHelper;
enum Flags {
kApplyTransferFn_Flag = 0x1,
kApplyGamutXform_Flag = 0x2,
// Almost never used. This handles the case where the src data is sRGB pixel config,
// but the color space has a different transfer function. In that case, we first undo
// the HW sRGB -> Linear conversion, before applying any other steps.
kApplyInverseSRGB_Flag = 0x4,
};
SkColorSpaceTransferFn fSrcTransferFn;
SkMatrix44 fGamutXform;
uint32_t fFlags;
};
class GrColorSpaceXformEffect : public GrFragmentProcessor {
public:
/**
* 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,
const SkColorSpace* src,
GrPixelConfig srcConfig,
const 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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