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/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkColorSpaceXformer.h"
#include "SkRadialGradient.h"
#include "SkRasterPipeline.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
namespace {
SkMatrix rad_to_unit_matrix(const SkPoint& center, SkScalar radius) {
SkScalar inv = SkScalarInvert(radius);
SkMatrix matrix;
matrix.setTranslate(-center.fX, -center.fY);
matrix.postScale(inv, inv);
return matrix;
}
} // namespace
/////////////////////////////////////////////////////////////////////
SkRadialGradient::SkRadialGradient(const SkPoint& center, SkScalar radius, const Descriptor& desc)
: SkGradientShaderBase(desc, rad_to_unit_matrix(center, radius))
, fCenter(center)
, fRadius(radius) {
}
SkShader::GradientType SkRadialGradient::asAGradient(GradientInfo* info) const {
if (info) {
commonAsAGradient(info);
info->fPoint[0] = fCenter;
info->fRadius[0] = fRadius;
}
return kRadial_GradientType;
}
sk_sp<SkFlattenable> SkRadialGradient::CreateProc(SkReadBuffer& buffer) {
DescriptorScope desc;
if (!desc.unflatten(buffer)) {
return nullptr;
}
const SkPoint center = buffer.readPoint();
const SkScalar radius = buffer.readScalar();
return SkGradientShader::MakeRadial(center, radius, desc.fColors, std::move(desc.fColorSpace),
desc.fPos, desc.fCount, desc.fTileMode, desc.fGradFlags,
desc.fLocalMatrix);
}
void SkRadialGradient::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writePoint(fCenter);
buffer.writeScalar(fRadius);
}
/////////////////////////////////////////////////////////////////////
#if SK_SUPPORT_GPU
#include "SkGr.h"
#include "GrShaderCaps.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
class GrRadialGradient : public GrGradientEffect {
public:
class GLSLRadialProcessor;
static std::unique_ptr<GrFragmentProcessor> Make(const CreateArgs& args) {
return GrGradientEffect::AdjustFP(std::unique_ptr<GrRadialGradient>(
new GrRadialGradient(args)),
args);
}
const char* name() const override { return "Radial Gradient"; }
std::unique_ptr<GrFragmentProcessor> clone() const override {
return std::unique_ptr<GrFragmentProcessor>(new GrRadialGradient(*this));
}
private:
explicit GrRadialGradient(const CreateArgs& args)
: INHERITED(kGrRadialGradient_ClassID, args, args.fShader->colorsAreOpaque()) {}
explicit GrRadialGradient(const GrRadialGradient& that) : INHERITED(that) {}
GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
GR_DECLARE_FRAGMENT_PROCESSOR_TEST
typedef GrGradientEffect INHERITED;
};
/////////////////////////////////////////////////////////////////////
class GrRadialGradient::GLSLRadialProcessor : public GrGradientEffect::GLSLProcessor {
public:
GLSLRadialProcessor(const GrProcessor&) {}
virtual void emitCode(EmitArgs&) override;
private:
typedef GrGradientEffect::GLSLProcessor INHERITED;
};
/////////////////////////////////////////////////////////////////////
GrGLSLFragmentProcessor* GrRadialGradient::onCreateGLSLInstance() const {
return new GrRadialGradient::GLSLRadialProcessor(*this);
}
/////////////////////////////////////////////////////////////////////
GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrRadialGradient);
#if GR_TEST_UTILS
std::unique_ptr<GrFragmentProcessor> GrRadialGradient::TestCreate(GrProcessorTestData* d) {
sk_sp<SkShader> shader;
do {
RandomGradientParams params(d->fRandom);
SkPoint center = {d->fRandom->nextUScalar1(), d->fRandom->nextUScalar1()};
SkScalar radius = d->fRandom->nextUScalar1();
shader = params.fUseColors4f
? SkGradientShader::MakeRadial(center, radius, params.fColors4f,
params.fColorSpace, params.fStops,
params.fColorCount, params.fTileMode)
: SkGradientShader::MakeRadial(center, radius, params.fColors,
params.fStops, params.fColorCount,
params.fTileMode);
} while (!shader);
GrTest::TestAsFPArgs asFPArgs(d);
std::unique_ptr<GrFragmentProcessor> fp = as_SB(shader)->asFragmentProcessor(asFPArgs.args());
GrAlwaysAssert(fp);
return fp;
}
#endif
/////////////////////////////////////////////////////////////////////
void GrRadialGradient::GLSLRadialProcessor::emitCode(EmitArgs& args) {
const GrRadialGradient& ge = args.fFp.cast<GrRadialGradient>();
this->emitUniforms(args.fUniformHandler, ge);
SkString t("length(");
t.append(args.fFragBuilder->ensureCoords2D(args.fTransformedCoords[0]));
t.append(")");
this->emitColor(args.fFragBuilder,
args.fUniformHandler,
args.fShaderCaps,
ge, t.c_str(),
args.fOutputColor,
args.fInputColor,
args.fTexSamplers);
}
/////////////////////////////////////////////////////////////////////
std::unique_ptr<GrFragmentProcessor> SkRadialGradient::asFragmentProcessor(
const GrFPArgs& args) const {
SkASSERT(args.fContext);
SkMatrix matrix;
if (!this->getLocalMatrix().invert(&matrix)) {
return nullptr;
}
if (args.fLocalMatrix) {
SkMatrix inv;
if (!args.fLocalMatrix->invert(&inv)) {
return nullptr;
}
matrix.postConcat(inv);
}
matrix.postConcat(fPtsToUnit);
return GrRadialGradient::Make(GrGradientEffect::CreateArgs(
args.fContext, this, &matrix, fTileMode, args.fDstColorSpaceInfo->colorSpace()));
}
#endif
sk_sp<SkShader> SkRadialGradient::onMakeColorSpace(SkColorSpaceXformer* xformer) const {
const AutoXformColors xformedColors(*this, xformer);
return SkGradientShader::MakeRadial(fCenter, fRadius, xformedColors.fColors.get(), fOrigPos,
fColorCount, fTileMode, fGradFlags,
&this->getLocalMatrix());
}
void SkRadialGradient::appendGradientStages(SkArenaAlloc*, SkRasterPipeline* p,
SkRasterPipeline*) const {
p->append(SkRasterPipeline::xy_to_radius);
}
void SkRadialGradient::toString(SkString* str) const {
str->append("SkRadialGradient: (");
str->append("center: (");
str->appendScalar(fCenter.fX);
str->append(", ");
str->appendScalar(fCenter.fY);
str->append(") radius: ");
str->appendScalar(fRadius);
str->append(" ");
this->INHERITED::toString(str);
str->append(")");
}
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