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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "include/core/SkColorFilter.h"
#include "include/core/SkString.h"
#include "include/private/SkColorData.h"
#include "src/core/SkArenaAlloc.h"
#include "src/core/SkBlendModePriv.h"
#include "src/core/SkBlenderBase.h"
#include "src/core/SkRasterPipeline.h"
#include "src/core/SkReadBuffer.h"
#include "src/core/SkRuntimeEffectPriv.h"
#include "src/core/SkVM.h"
#include "src/core/SkWriteBuffer.h"
#include "src/shaders/SkColorShader.h"
#include "src/shaders/SkComposeShader.h"
#ifdef SK_ENABLE_SKSL
#include "src/core/SkKeyHelpers.h"
#include "src/core/SkPaintParamsKey.h"
#endif
namespace {
struct LocalMatrixStageRec final : public SkStageRec {
LocalMatrixStageRec(const SkStageRec& rec, const SkMatrix& lm)
: INHERITED(rec) {
if (!lm.isIdentity()) {
if (fLocalM) {
fStorage.setConcat(lm, *fLocalM);
fLocalM = fStorage.isIdentity() ? nullptr : &fStorage;
} else {
fLocalM = &lm;
}
}
}
private:
SkMatrix fStorage;
using INHERITED = SkStageRec;
};
} // namespace
sk_sp<SkShader> SkShaders::Blend(SkBlendMode mode, sk_sp<SkShader> dst, sk_sp<SkShader> src) {
if (!src || !dst) {
return nullptr;
}
switch (mode) {
case SkBlendMode::kClear: return Color(0);
case SkBlendMode::kDst: return dst;
case SkBlendMode::kSrc: return src;
default: break;
}
return sk_sp<SkShader>(new SkShader_Blend(mode, std::move(dst), std::move(src)));
}
sk_sp<SkShader> SkShaders::Blend(sk_sp<SkBlender> blender, sk_sp<SkShader> dst, sk_sp<SkShader> src) {
if (!src || !dst) {
return nullptr;
}
if (!blender) {
return SkShaders::Blend(SkBlendMode::kSrcOver, std::move(dst), std::move(src));
}
return sk_sp<SkShader>(new SkShader_Blend(std::move(blender), std::move(dst), std::move(src)));
}
///////////////////////////////////////////////////////////////////////////////
SkShader_Blend::SkShader_Blend(sk_sp<SkBlender> blender, sk_sp<SkShader> dst, sk_sp<SkShader> src)
: fDst(std::move(dst))
, fSrc(std::move(src))
, fBlender(std::move(blender))
, fMode((SkBlendMode)kCustom_SkBlendMode) {
if (std::optional<SkBlendMode> bm = as_BB(fBlender)->asBlendMode(); bm.has_value()) {
fMode = *bm;
fBlender.reset();
}
}
sk_sp<SkFlattenable> SkShader_Blend::CreateProc(SkReadBuffer& buffer) {
sk_sp<SkShader> dst(buffer.readShader());
sk_sp<SkShader> src(buffer.readShader());
if (!buffer.validate(dst && src)) {
return nullptr;
}
sk_sp<SkBlender> blender(nullptr);
unsigned mode = buffer.read32();
if (mode == kCustom_SkBlendMode) {
blender = buffer.readBlender();
if (buffer.validate(blender != nullptr)) {
return SkShaders::Blend(std::move(blender), std::move(dst), std::move(src));
}
} else {
if (buffer.validate(mode <= (unsigned)SkBlendMode::kLastMode)) {
return SkShaders::Blend(static_cast<SkBlendMode>(mode), std::move(dst), std::move(src));
}
}
return nullptr;
}
void SkShader_Blend::flatten(SkWriteBuffer& buffer) const {
buffer.writeFlattenable(fDst.get());
buffer.writeFlattenable(fSrc.get());
if (fBlender) {
buffer.write32(kCustom_SkBlendMode);
buffer.writeFlattenable(fBlender.get());
} else {
buffer.write32((int)fMode);
}
}
// Returns the output of e0, and leaves the output of e1 in r,g,b,a
static float* append_two_shaders(const SkStageRec& rec, SkShader* s0, SkShader* s1) {
struct Storage {
float fRes0[4 * SkRasterPipeline_kMaxStride];
};
auto storage = rec.fAlloc->make<Storage>();
if (!as_SB(s0)->appendStages(rec)) {
return nullptr;
}
rec.fPipeline->append(SkRasterPipeline::store_src, storage->fRes0);
if (!as_SB(s1)->appendStages(rec)) {
return nullptr;
}
return storage->fRes0;
}
bool SkShader_Blend::onAppendStages(const SkStageRec& orig_rec) const {
if (fBlender) {
return false;
}
const LocalMatrixStageRec rec(orig_rec, this->getLocalMatrix());
float* res0 = append_two_shaders(rec, fDst.get(), fSrc.get());
if (!res0) {
return false;
}
rec.fPipeline->append(SkRasterPipeline::load_dst, res0);
SkBlendMode_AppendStages(fMode, rec.fPipeline);
return true;
}
skvm::Color SkShader_Blend::onProgram(skvm::Builder* p,
skvm::Coord device, skvm::Coord local, skvm::Color paint,
const SkMatrixProvider& mats, const SkMatrix* localM,
const SkColorInfo& cinfo,
skvm::Uniforms* uniforms, SkArenaAlloc* alloc) const {
skvm::Color d,s;
if ((d = as_SB(fDst)->program(p, device,local, paint, mats,localM, cinfo, uniforms,alloc)) &&
(s = as_SB(fSrc)->program(p, device,local, paint, mats,localM, cinfo, uniforms,alloc)))
{
if (fBlender) {
return as_BB(fBlender)->program(p, s,d, cinfo, uniforms,alloc);
} else {
return p->blend(fMode, s,d);
}
}
return {};
}
#if SK_SUPPORT_GPU
#include "include/gpu/GrRecordingContext.h"
#include "src/gpu/ganesh/GrFragmentProcessor.h"
#include "src/gpu/ganesh/effects/GrBlendFragmentProcessor.h"
std::unique_ptr<GrFragmentProcessor> SkShader_Blend::asFragmentProcessor(
const GrFPArgs& orig_args) const {
GrFPArgs::WithPreLocalMatrix args(orig_args, this->getLocalMatrix());
auto fpA = as_SB(fDst)->asFragmentProcessor(args);
auto fpB = as_SB(fSrc)->asFragmentProcessor(args);
if (!fpA || !fpB) {
// This is unexpected. Both src and dst shaders should be valid. Just fail.
return nullptr;
}
if (fBlender) {
return as_BB(fBlender)->asFragmentProcessor(std::move(fpB), std::move(fpA), orig_args);
} else {
return GrBlendFragmentProcessor::Make(std::move(fpB), std::move(fpA), fMode);
}
}
#endif
#ifdef SK_ENABLE_SKSL
void SkShader_Blend::addToKey(const SkKeyContext& keyContext,
SkPaintParamsKeyBuilder* builder,
SkPipelineDataGatherer* gatherer) const {
// TODO: add blender support
SkASSERT(!fBlender);
BlendShaderBlock::BeginBlock(keyContext, builder, gatherer, { fMode });
as_SB(fDst)->addToKey(keyContext, builder, gatherer);
as_SB(fSrc)->addToKey(keyContext, builder, gatherer);
builder->endBlock();
}
#endif
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