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/*
* Copyright 2023 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/SkFlattenable.h"
#include "src/base/SkArenaAlloc.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/SkShaderBase.h"
#if defined(SK_GANESH)
#include "include/effects/SkRuntimeEffect.h"
#include "include/gpu/GrRecordingContext.h"
#include "src/gpu/ganesh/GrFPArgs.h"
#include "src/gpu/ganesh/GrFragmentProcessor.h"
#include "src/gpu/ganesh/effects/GrSkSLFP.h"
#endif
#if defined(SK_GRAPHITE)
#include "src/gpu/graphite/KeyHelpers.h"
#include "src/gpu/graphite/PaintParamsKey.h"
#endif // SK_GRAPHITE
class SkShader_CoordClamp final : public SkShaderBase {
public:
SkShader_CoordClamp(sk_sp<SkShader> shader, const SkRect& subset)
: fShader(std::move(shader)), fSubset(subset) {}
#if defined(SK_GANESH)
std::unique_ptr<GrFragmentProcessor> asFragmentProcessor(const GrFPArgs&,
const MatrixRec&) const override;
#endif
#if defined(SK_GRAPHITE)
void addToKey(const skgpu::graphite::KeyContext&,
skgpu::graphite::PaintParamsKeyBuilder*,
skgpu::graphite::PipelineDataGatherer*) const override;
#endif
protected:
SkShader_CoordClamp(SkReadBuffer&);
void flatten(SkWriteBuffer&) const override;
bool appendStages(const SkStageRec&, const MatrixRec&) const override;
skvm::Color program(skvm::Builder*,
skvm::Coord device,
skvm::Coord local,
skvm::Color paint,
const MatrixRec&,
const SkColorInfo& dst,
skvm::Uniforms*,
SkArenaAlloc*) const override;
private:
friend void ::SkRegisterCoordClampShaderFlattenable();
SK_FLATTENABLE_HOOKS(SkShader_CoordClamp)
sk_sp<SkShader> fShader;
SkRect fSubset;
};
sk_sp<SkFlattenable> SkShader_CoordClamp::CreateProc(SkReadBuffer& buffer) {
sk_sp<SkShader> shader(buffer.readShader());
SkRect subset = buffer.readRect();
if (!buffer.validate(SkToBool(shader))) {
return nullptr;
}
return SkShaders::CoordClamp(std::move(shader), subset);
}
void SkShader_CoordClamp::flatten(SkWriteBuffer& buffer) const {
buffer.writeFlattenable(fShader.get());
buffer.writeRect(fSubset);
}
bool SkShader_CoordClamp::appendStages(const SkStageRec& rec, const MatrixRec& mRec) const {
std::optional<MatrixRec> childMRec = mRec.apply(rec);
if (!childMRec.has_value()) {
return false;
}
// Strictly speaking, childMRec's total matrix is not valid. It is only valid inside the subset
// rectangle. However, we don't mark it as such because we want the "total matrix is valid"
// behavior in SkImageShader for filtering.
auto clampCtx = rec.fAlloc->make<SkRasterPipeline_CoordClampCtx>();
*clampCtx = {fSubset.fLeft, fSubset.fTop, fSubset.fRight, fSubset.fBottom};
rec.fPipeline->append(SkRasterPipelineOp::clamp_x_and_y, clampCtx);
return as_SB(fShader)->appendStages(rec, *childMRec);
}
skvm::Color SkShader_CoordClamp::program(skvm::Builder* p,
skvm::Coord device,
skvm::Coord local,
skvm::Color paint,
const MatrixRec& mRec,
const SkColorInfo& cinfo,
skvm::Uniforms* uniforms,
SkArenaAlloc* alloc) const {
std::optional<MatrixRec> childMRec = mRec.apply(p, &local, uniforms);
if (!childMRec.has_value()) {
return {};
}
// See comment in appendStages about not marking childMRec with an invalid total matrix.
auto l = uniforms->pushF(fSubset.left());
auto t = uniforms->pushF(fSubset.top());
auto r = uniforms->pushF(fSubset.right());
auto b = uniforms->pushF(fSubset.bottom());
local.x = p->clamp(local.x, p->uniformF(l), p->uniformF(r));
local.y = p->clamp(local.y, p->uniformF(t), p->uniformF(b));
return as_SB(fShader)->program(p, device, local, paint, *childMRec, cinfo, uniforms, alloc);
}
#if defined(SK_GANESH)
std::unique_ptr<GrFragmentProcessor> SkShader_CoordClamp::asFragmentProcessor(
const GrFPArgs& args, const MatrixRec& mRec) const {
static const SkRuntimeEffect* effect = SkMakeRuntimeEffect(SkRuntimeEffect::MakeForShader,
"uniform shader c;"
"uniform float4 s;"
"half4 main(float2 p) {"
"return c.eval(clamp(p, s.LT, s.RB));"
"}");
auto fp = as_SB(fShader)->asFragmentProcessor(args, mRec.applied());
if (!fp) {
return nullptr;
}
GrSkSLFP::OptFlags flags = GrSkSLFP::OptFlags::kNone;
if (fp->compatibleWithCoverageAsAlpha()) {
flags |= GrSkSLFP::OptFlags::kCompatibleWithCoverageAsAlpha;
}
if (fp->preservesOpaqueInput()) {
flags |= GrSkSLFP::OptFlags::kPreservesOpaqueInput;
}
fp = GrSkSLFP::Make(effect,
"clamp_fp",
/*inputFP=*/nullptr,
flags,
"c", std::move(fp),
"s", fSubset);
bool success;
std::tie(success, fp) = mRec.apply(std::move(fp));
return success ? std::move(fp) : nullptr;
}
#endif // defined(SK_GANESH)
#if defined(SK_GRAPHITE)
void SkShader_CoordClamp::addToKey(const skgpu::graphite::KeyContext& keyContext,
skgpu::graphite::PaintParamsKeyBuilder* builder,
skgpu::graphite::PipelineDataGatherer* gatherer) const {
using namespace skgpu::graphite;
CoordClampShaderBlock::CoordClampData data(fSubset);
CoordClampShaderBlock::BeginBlock(keyContext, builder, gatherer, &data);
as_SB(fShader)->addToKey(keyContext, builder, gatherer);
builder->endBlock();
}
#endif // SK_GRAPHITE
void SkRegisterCoordClampShaderFlattenable() { SK_REGISTER_FLATTENABLE(SkShader_CoordClamp); }
sk_sp<SkShader> SkShaders::CoordClamp(sk_sp<SkShader> shader, const SkRect& subset) {
if (!shader) {
return nullptr;
}
if (!subset.isSorted()) {
return nullptr;
}
return sk_make_sp<SkShader_CoordClamp>(std::move(shader), subset);
}
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