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* Copyright 2023 Google LLC
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef SkFilterColorProgram_DEFINED
#define SkFilterColorProgram_DEFINED
#include "include/private/SkColorData.h"
#include "src/core/SkVM.h"
#include <functional>
#include <memory>
#include <vector>
class SkRuntimeEffect;
#if defined(SK_ENABLE_SKSL)
#if defined(SK_ENABLE_SKVM)
* Runtime effects are often long lived & cached. Individual color filters or FPs created from them
* and are often short-lived. However, color filters and FPs may need to operate on a single color
* (on the CPU). This may be done at the paint level (eg, filter the paint color), or as part of
* FP tree analysis.
* SkFilterColorProgram is an skvm program representing a (color filter) SkRuntimeEffect. It can
* process a single color, without knowing the details of a particular instance (uniform values or
* children).
class SkFilterColorProgram {
static std::unique_ptr<SkFilterColorProgram> Make(const SkRuntimeEffect* effect);
SkPMColor4f eval(const SkPMColor4f& inColor,
const void* uniformData,
std::function<SkPMColor4f(int, SkPMColor4f)> evalChild) const;
struct SampleCall {
enum class Kind {
kInputColor, // eg child.eval(inputColor)
kImmediate, // eg child.eval(half4(1))
kPrevious, // eg child1.eval(child2.eval(...))
kUniform, // eg uniform half4 color; ... child.eval(color)
int fChild;
Kind fKind;
union {
SkPMColor4f fImm; // for kImmediate
int fPrevious; // for kPrevious
int fOffset; // for kUniform
SkFilterColorProgram(skvm::Program program, std::vector<SampleCall> sampleCalls);
skvm::Program fProgram;
std::vector<SampleCall> fSampleCalls;
#else // !defined(SK_ENABLE_SKVM)
// SkRP does not use SkFilterColorProgram; this stub implementation can be removed post-SkVM.
class SkFilterColorProgram {
static std::unique_ptr<SkFilterColorProgram> Make(const SkRuntimeEffect*) { return nullptr; }
#endif // SK_ENABLE_SKVM
#endif // SK_ENABLE_SKSL
#endif // SkFilterColorProgram_DEFINED