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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 "SkLinearGradient.h"
#include "Sk4fLinearGradient.h"
#include "SkColorSpaceXformer.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
static SkMatrix pts_to_unit_matrix(const SkPoint pts[2]) {
SkVector vec = pts[1] - pts[0];
SkScalar mag = vec.length();
SkScalar inv = mag ? SkScalarInvert(mag) : 0;
vec.scale(inv);
SkMatrix matrix;
matrix.setSinCos(-vec.fY, vec.fX, pts[0].fX, pts[0].fY);
matrix.postTranslate(-pts[0].fX, -pts[0].fY);
matrix.postScale(inv, inv);
return matrix;
}
///////////////////////////////////////////////////////////////////////////////
SkLinearGradient::SkLinearGradient(const SkPoint pts[2], const Descriptor& desc)
: SkGradientShaderBase(desc, pts_to_unit_matrix(pts))
, fStart(pts[0])
, fEnd(pts[1]) {
}
sk_sp<SkFlattenable> SkLinearGradient::CreateProc(SkReadBuffer& buffer) {
DescriptorScope desc;
if (!desc.unflatten(buffer)) {
return nullptr;
}
SkPoint pts[2];
pts[0] = buffer.readPoint();
pts[1] = buffer.readPoint();
return SkGradientShader::MakeLinear(pts, desc.fColors, std::move(desc.fColorSpace), desc.fPos,
desc.fCount, desc.fTileMode, desc.fGradFlags,
desc.fLocalMatrix);
}
void SkLinearGradient::flatten(SkWriteBuffer& buffer) const {
this->INHERITED::flatten(buffer);
buffer.writePoint(fStart);
buffer.writePoint(fEnd);
}
SkShaderBase::Context* SkLinearGradient::onMakeContext(
const ContextRec& rec, SkArenaAlloc* alloc) const
{
return fTileMode != kDecal_TileMode
? CheckedMakeContext<LinearGradient4fContext>(alloc, *this, rec)
: nullptr;
}
SkShaderBase::Context* SkLinearGradient::onMakeBurstPipelineContext(
const ContextRec& rec, SkArenaAlloc* alloc) const {
if (fTileMode == SkShader::kDecal_TileMode) {
// we only support decal w/ stages
return nullptr;
}
// Raster pipeline has a 2-stop specialization faster than our burst.
return fColorCount > 2 ? CheckedMakeContext<LinearGradient4fContext>(alloc, *this, rec)
: nullptr;
}
void SkLinearGradient::appendGradientStages(SkArenaAlloc*, SkRasterPipeline*,
SkRasterPipeline*) const {
// No extra stage needed for linear gradients.
}
sk_sp<SkShader> SkLinearGradient::onMakeColorSpace(SkColorSpaceXformer* xformer) const {
const AutoXformColors xformedColors(*this, xformer);
SkPoint pts[2] = { fStart, fEnd };
return SkGradientShader::MakeLinear(pts, xformedColors.fColors.get(), fOrigPos, fColorCount,
fTileMode, fGradFlags, &this->getLocalMatrix());
}
SkShader::GradientType SkLinearGradient::asAGradient(GradientInfo* info) const {
if (info) {
commonAsAGradient(info);
info->fPoint[0] = fStart;
info->fPoint[1] = fEnd;
}
return kLinear_GradientType;
}
#if SK_SUPPORT_GPU
#include "GrShaderCaps.h"
#include "glsl/GrGLSLFragmentShaderBuilder.h"
#include "SkGr.h"
/////////////////////////////////////////////////////////////////////
class GrLinearGradient : public GrGradientEffect {
public:
class GLSLLinearProcessor;
static std::unique_ptr<GrFragmentProcessor> Make(const CreateArgs& args) {
return GrGradientEffect::AdjustFP(std::unique_ptr<GrLinearGradient>(
new GrLinearGradient(args)),
args);
}
const char* name() const override { return "Linear Gradient"; }
std::unique_ptr<GrFragmentProcessor> clone() const override {
return std::unique_ptr<GrFragmentProcessor>(new GrLinearGradient(*this));
}
private:
explicit GrLinearGradient(const CreateArgs& args)
: INHERITED(kGrLinearGradient_ClassID, args, args.fShader->colorsAreOpaque()) {
}
explicit GrLinearGradient(const GrLinearGradient& that) : INHERITED(that) {}
GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
GR_DECLARE_FRAGMENT_PROCESSOR_TEST
typedef GrGradientEffect INHERITED;
};
/////////////////////////////////////////////////////////////////////
class GrLinearGradient::GLSLLinearProcessor : public GrGradientEffect::GLSLProcessor {
public:
GLSLLinearProcessor(const GrProcessor&) {}
virtual void emitCode(EmitArgs&) override;
private:
typedef GrGradientEffect::GLSLProcessor INHERITED;
};
/////////////////////////////////////////////////////////////////////
GrGLSLFragmentProcessor* GrLinearGradient::onCreateGLSLInstance() const {
return new GrLinearGradient::GLSLLinearProcessor(*this);
}
/////////////////////////////////////////////////////////////////////
GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrLinearGradient);
#if GR_TEST_UTILS
std::unique_ptr<GrFragmentProcessor> GrLinearGradient::TestCreate(GrProcessorTestData* d) {
SkPoint points[] = {{d->fRandom->nextUScalar1(), d->fRandom->nextUScalar1()},
{d->fRandom->nextUScalar1(), d->fRandom->nextUScalar1()}};
RandomGradientParams params(d->fRandom);
auto shader = params.fUseColors4f ?
SkGradientShader::MakeLinear(points, params.fColors4f, params.fColorSpace, params.fStops,
params.fColorCount, params.fTileMode) :
SkGradientShader::MakeLinear(points, params.fColors, params.fStops,
params.fColorCount, params.fTileMode);
GrTest::TestAsFPArgs asFPArgs(d);
std::unique_ptr<GrFragmentProcessor> fp = as_SB(shader)->asFragmentProcessor(asFPArgs.args());
GrAlwaysAssert(fp);
return fp;
}
#endif
/////////////////////////////////////////////////////////////////////
void GrLinearGradient::GLSLLinearProcessor::emitCode(EmitArgs& args) {
const GrLinearGradient& ge = args.fFp.cast<GrLinearGradient>();
this->emitUniforms(args.fUniformHandler, ge);
SkString t = args.fFragBuilder->ensureCoords2D(args.fTransformedCoords[0]);
t.append(".x");
this->emitColor(args.fFragBuilder,
args.fUniformHandler,
args.fShaderCaps,
ge,
t.c_str(),
args.fOutputColor,
args.fInputColor,
args.fTexSamplers);
}
/////////////////////////////////////////////////////////////////////
std::unique_ptr<GrFragmentProcessor> SkLinearGradient::asFragmentProcessor(
const GrFPArgs& args) const {
SkASSERT(args.fContext);
SkMatrix matrix;
if (!this->totalLocalMatrix(args.fPreLocalMatrix, args.fPostLocalMatrix)->invert(&matrix)) {
return nullptr;
}
matrix.postConcat(fPtsToUnit);
return GrLinearGradient::Make(GrGradientEffect::CreateArgs(
args.fContext, this, &matrix, fTileMode, args.fDstColorSpaceInfo));
}
#endif
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