blob: 3d564389cc4d8b3341ce9891301ae2249f2aceda [file] [log] [blame]
/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "src/core/SkMatrixProvider.h"
#include "src/core/SkTLazy.h"
#include "src/core/SkVM.h"
#include "src/shaders/SkLocalMatrixShader.h"
#if SK_SUPPORT_GPU
#include "src/gpu/GrFragmentProcessor.h"
#include "src/gpu/effects/GrMatrixEffect.h"
#endif
#if SK_SUPPORT_GPU
std::unique_ptr<GrFragmentProcessor> SkLocalMatrixShader::asFragmentProcessor(
const GrFPArgs& args) const {
return as_SB(fProxyShader)->asFragmentProcessor(
GrFPArgs::WithPreLocalMatrix(args, this->getLocalMatrix()));
}
#endif
sk_sp<SkFlattenable> SkLocalMatrixShader::CreateProc(SkReadBuffer& buffer) {
SkMatrix lm;
buffer.readMatrix(&lm);
auto baseShader(buffer.readShader());
if (!baseShader) {
return nullptr;
}
return baseShader->makeWithLocalMatrix(lm);
}
void SkLocalMatrixShader::flatten(SkWriteBuffer& buffer) const {
buffer.writeMatrix(this->getLocalMatrix());
buffer.writeFlattenable(fProxyShader.get());
}
#ifdef SK_ENABLE_LEGACY_SHADERCONTEXT
SkShaderBase::Context* SkLocalMatrixShader::onMakeContext(
const ContextRec& rec, SkArenaAlloc* alloc) const
{
SkTCopyOnFirstWrite<SkMatrix> lm(this->getLocalMatrix());
if (rec.fLocalMatrix) {
lm.writable()->preConcat(*rec.fLocalMatrix);
}
ContextRec newRec(rec);
newRec.fLocalMatrix = lm;
return as_SB(fProxyShader)->makeContext(newRec, alloc);
}
#endif
SkImage* SkLocalMatrixShader::onIsAImage(SkMatrix* outMatrix, SkTileMode* mode) const {
SkMatrix imageMatrix;
SkImage* image = fProxyShader->isAImage(&imageMatrix, mode);
if (image && outMatrix) {
// Local matrix must be applied first so it is on the right side of the concat.
*outMatrix = SkMatrix::Concat(imageMatrix, this->getLocalMatrix());
}
return image;
}
bool SkLocalMatrixShader::onAppendStages(const SkStageRec& rec) const {
SkTCopyOnFirstWrite<SkMatrix> lm(this->getLocalMatrix());
if (rec.fLocalM) {
lm.writable()->preConcat(*rec.fLocalM);
}
SkStageRec newRec = rec;
newRec.fLocalM = lm;
return as_SB(fProxyShader)->appendStages(newRec);
}
skvm::Color SkLocalMatrixShader::onProgram(skvm::Builder* p,
skvm::Coord device, skvm::Coord local, skvm::Color paint,
const SkMatrixProvider& matrices, const SkMatrix* localM,
const SkColorInfo& dst,
skvm::Uniforms* uniforms, SkArenaAlloc* alloc) const {
SkTCopyOnFirstWrite<SkMatrix> lm(this->getLocalMatrix());
if (localM) {
lm.writable()->preConcat(*localM);
}
return as_SB(fProxyShader)->program(p, device,local, paint,
matrices,lm.get(), dst,
uniforms,alloc);
}
sk_sp<SkShader> SkShader::makeWithLocalMatrix(const SkMatrix& localMatrix) const {
if (localMatrix.isIdentity()) {
return sk_ref_sp(const_cast<SkShader*>(this));
}
const SkMatrix* lm = &localMatrix;
sk_sp<SkShader> baseShader;
SkMatrix otherLocalMatrix;
sk_sp<SkShader> proxy(as_SB(this)->makeAsALocalMatrixShader(&otherLocalMatrix));
if (proxy) {
otherLocalMatrix.preConcat(localMatrix);
lm = &otherLocalMatrix;
baseShader = proxy;
} else {
baseShader = sk_ref_sp(const_cast<SkShader*>(this));
}
return sk_make_sp<SkLocalMatrixShader>(std::move(baseShader), *lm);
}
////////////////////////////////////////////////////////////////////
/**
* Replaces the CTM when used. Created to support clipShaders, which have to be evaluated
* using the CTM that was present at the time they were specified (which may be different
* from the CTM at the time something is drawn through the clip.
*/
class SkCTMShader final : public SkShaderBase {
public:
SkCTMShader(sk_sp<SkShader> proxy, const SkMatrix& ctm)
: fProxyShader(std::move(proxy))
, fCTM(ctm)
{}
GradientType asAGradient(GradientInfo* info) const override {
return fProxyShader->asAGradient(info);
}
#if SK_SUPPORT_GPU
std::unique_ptr<GrFragmentProcessor> asFragmentProcessor(const GrFPArgs&) const override;
#endif
protected:
void flatten(SkWriteBuffer&) const override { SkASSERT(false); }
#ifdef SK_ENABLE_LEGACY_SHADERCONTEXT
Context* onMakeContext(const ContextRec&, SkArenaAlloc*) const override { return nullptr; }
#endif
bool onAppendStages(const SkStageRec& rec) const override {
SkOverrideDeviceMatrixProvider matrixProvider(fCTM);
SkStageRec newRec = {
rec.fPipeline,
rec.fAlloc,
rec.fDstColorType,
rec.fDstCS,
rec.fPaint,
rec.fLocalM,
matrixProvider,
};
return as_SB(fProxyShader)->appendStages(newRec);
}
skvm::Color onProgram(skvm::Builder* p,
skvm::Coord device, skvm::Coord local, skvm::Color paint,
const SkMatrixProvider& matrices, const SkMatrix* localM,
const SkColorInfo& dst,
skvm::Uniforms* uniforms, SkArenaAlloc* alloc) const override {
SkOverrideDeviceMatrixProvider matrixProvider(fCTM);
return as_SB(fProxyShader)->program(p, device,local, paint,
matrixProvider,localM, dst,
uniforms,alloc);
}
private:
SK_FLATTENABLE_HOOKS(SkCTMShader)
sk_sp<SkShader> fProxyShader;
SkMatrix fCTM;
using INHERITED = SkShaderBase;
};
#if SK_SUPPORT_GPU
std::unique_ptr<GrFragmentProcessor> SkCTMShader::asFragmentProcessor(
const GrFPArgs& args) const {
SkMatrix ctmInv;
if (!fCTM.invert(&ctmInv)) {
return nullptr;
}
auto ctmProvider = SkOverrideDeviceMatrixProvider(fCTM);
auto base = as_SB(fProxyShader)->asFragmentProcessor(
GrFPArgs::WithPreLocalMatrix(args.withNewMatrixProvider(ctmProvider),
this->getLocalMatrix()));
if (!base) {
return nullptr;
}
// In order for the shader to be evaluated with the original CTM, we explicitly evaluate it
// at sk_FragCoord, and pass that through the inverse of the original CTM. This avoids requiring
// local coords for the shader and mapping from the draw's local to device and then back.
return GrFragmentProcessor::DeviceSpace(GrMatrixEffect::Make(ctmInv, std::move(base)));
}
#endif
sk_sp<SkFlattenable> SkCTMShader::CreateProc(SkReadBuffer& buffer) {
SkASSERT(false);
return nullptr;
}
sk_sp<SkShader> SkShaderBase::makeWithCTM(const SkMatrix& postM) const {
return sk_sp<SkShader>(new SkCTMShader(sk_ref_sp(this), postM));
}