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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.
*/
#include "GrColorSpaceXform.h"
#include "SkColorSpace.h"
#include "SkColorSpacePriv.h"
#include "SkMatrix44.h"
#include "glsl/GrGLSLColorSpaceXformHelper.h"
#include "glsl/GrGLSLFragmentProcessor.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
sk_sp<GrColorSpaceXform> GrColorSpaceXform::Make(SkColorSpace* src, SkColorSpace* dst) {
// No transformation is performed in legacy mode, until SkColorSpaceXformCanvas is gone
if (!dst) {
return nullptr;
}
// Treat null sources as sRGB.
if (!src) {
src = sk_srgb_singleton();
}
// TODO: Plumb source alpha type
SkColorSpaceXformSteps steps(src, kPremul_SkAlphaType, dst);
return steps.flags.mask() == 0 ? nullptr /* Noop transform */
: sk_make_sp<GrColorSpaceXform>(steps);
}
sk_sp<GrColorSpaceXform> GrColorSpaceXform::MakeUnpremulToUnpremul(SkColorSpace* src,
SkColorSpace* dst) {
// No transformation is performed in legacy mode, until SkColorSpaceXformCanvas is gone
if (!dst) {
return nullptr;
}
// Treat null sources as sRGB.
if (!src) {
src = sk_srgb_singleton();
}
SkColorSpaceXformSteps steps = SkColorSpaceXformSteps::UnpremulToUnpremul(src, dst);
return steps.flags.mask() == 0 ? nullptr /* Noop transform */
: sk_make_sp<GrColorSpaceXform>(steps);
}
bool GrColorSpaceXform::Equals(const GrColorSpaceXform* a, const GrColorSpaceXform* b) {
if (a == b) {
return true;
}
if (!a || !b || a->fSteps.flags.mask() != b->fSteps.flags.mask()) {
return false;
}
if (a->fSteps.flags.linearize &&
0 != memcmp(&a->fSteps.srcTF, &b->fSteps.srcTF, sizeof(a->fSteps.srcTF))) {
return false;
}
if (a->fSteps.flags.gamut_transform &&
0 != memcmp(&a->fSteps.src_to_dst_matrix, &b->fSteps.src_to_dst_matrix,
sizeof(a->fSteps.src_to_dst_matrix))) {
return false;
}
if (a->fSteps.flags.encode &&
0 != memcmp(&a->fSteps.dstTFInv, &b->fSteps.dstTFInv, sizeof(a->fSteps.dstTFInv))) {
return false;
}
return true;
}
GrColor4f GrColorSpaceXform::apply(const GrColor4f& srcColor) {
GrColor4f result = srcColor;
fSteps.apply(result.fRGBA);
return result;
}
//////////////////////////////////////////////////////////////////////////////
class GrGLColorSpaceXformEffect : public GrGLSLFragmentProcessor {
public:
void emitCode(EmitArgs& args) override {
const GrColorSpaceXformEffect& csxe = args.fFp.cast<GrColorSpaceXformEffect>();
GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
GrGLSLUniformHandler* uniformHandler = args.fUniformHandler;
fColorSpaceHelper.emitCode(uniformHandler, csxe.colorXform());
if (this->numChildProcessors()) {
SkString childColor("src_color");
this->emitChild(0, &childColor, args);
SkString xformedColor;
fragBuilder->appendColorGamutXform(&xformedColor, childColor.c_str(), &fColorSpaceHelper);
fragBuilder->codeAppendf("%s = %s * %s;", args.fOutputColor, xformedColor.c_str(),
args.fInputColor);
} else {
if (nullptr == args.fInputColor) {
args.fInputColor = "half4(1)";
}
SkString xformedColor;
fragBuilder->appendColorGamutXform(&xformedColor, args.fInputColor, &fColorSpaceHelper);
fragBuilder->codeAppendf("%s = %s;", args.fOutputColor, xformedColor.c_str());
}
}
private:
void onSetData(const GrGLSLProgramDataManager& pdman,
const GrFragmentProcessor& processor) override {
const GrColorSpaceXformEffect& csxe = processor.cast<GrColorSpaceXformEffect>();
fColorSpaceHelper.setData(pdman, csxe.colorXform());
}
GrGLSLColorSpaceXformHelper fColorSpaceHelper;
typedef GrGLSLFragmentProcessor INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
GrColorSpaceXformEffect::GrColorSpaceXformEffect(std::unique_ptr<GrFragmentProcessor> child,
sk_sp<GrColorSpaceXform> colorXform)
: INHERITED(kGrColorSpaceXformEffect_ClassID, OptFlags(child.get()))
, fColorXform(std::move(colorXform)) {
if (child) {
this->registerChildProcessor(std::move(child));
}
}
std::unique_ptr<GrFragmentProcessor> GrColorSpaceXformEffect::clone() const {
std::unique_ptr<GrFragmentProcessor> child =
this->numChildProcessors() ? this->childProcessor(0).clone() : nullptr;
return std::unique_ptr<GrFragmentProcessor>(
new GrColorSpaceXformEffect(std::move(child), fColorXform));
}
bool GrColorSpaceXformEffect::onIsEqual(const GrFragmentProcessor& s) const {
const GrColorSpaceXformEffect& other = s.cast<GrColorSpaceXformEffect>();
return GrColorSpaceXform::Equals(fColorXform.get(), other.fColorXform.get());
}
void GrColorSpaceXformEffect::onGetGLSLProcessorKey(const GrShaderCaps& caps,
GrProcessorKeyBuilder* b) const {
b->add32(GrColorSpaceXform::XformKey(fColorXform.get()));
}
GrGLSLFragmentProcessor* GrColorSpaceXformEffect::onCreateGLSLInstance() const {
return new GrGLColorSpaceXformEffect();
}
GrFragmentProcessor::OptimizationFlags GrColorSpaceXformEffect::OptFlags(
const GrFragmentProcessor* child) {
// TODO: Implement constant output for constant input
if (child) {
OptimizationFlags flags = kNone_OptimizationFlags;
if (child->compatibleWithCoverageAsAlpha()) {
flags |= kCompatibleWithCoverageAsAlpha_OptimizationFlag;
}
if (child->preservesOpaqueInput()) {
flags |= kPreservesOpaqueInput_OptimizationFlag;
}
return flags;
} else {
return kCompatibleWithCoverageAsAlpha_OptimizationFlag |
kPreservesOpaqueInput_OptimizationFlag;
}
}
std::unique_ptr<GrFragmentProcessor> GrColorSpaceXformEffect::Make(SkColorSpace* src,
SkColorSpace* dst) {
auto xform = GrColorSpaceXform::Make(src, dst);
if (!xform) {
return nullptr;
}
return std::unique_ptr<GrFragmentProcessor>(new GrColorSpaceXformEffect(nullptr,
std::move(xform)));
}
std::unique_ptr<GrFragmentProcessor> GrColorSpaceXformEffect::Make(
std::unique_ptr<GrFragmentProcessor> child,
SkColorSpace* src, SkColorSpace* dst) {
if (!child) {
return nullptr;
}
auto xform = GrColorSpaceXform::Make(src, dst);
if (!xform) {
return child;
}
return std::unique_ptr<GrFragmentProcessor>(new GrColorSpaceXformEffect(std::move(child),
std::move(xform)));
}
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