/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkLocalMatrixShader_DEFINED
#define SkLocalMatrixShader_DEFINED
#include "include/core/SkColor.h"
#include "include/core/SkFlattenable.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkShader.h"
#include "include/core/SkTypes.h"
#include "src/shaders/SkShaderBase.h"
#include <type_traits>
#include <utility>
class SkArenaAlloc;
class SkImage;
class SkReadBuffer;
class SkWriteBuffer;
enum class SkTileMode;
struct SkStageRec;
class SkLocalMatrixShader final :
public SkShaderBase {
public:
template <
typename T,
typename... Args>
static std::enable_if_t<std::is_base_of_v<SkShader, T>, sk_sp<SkShader>>
MakeWrapped(
const SkMatrix* localMatrix, Args&&... args) {
auto t = sk_make_sp<T>(std::forward<Args>(args)...);
if (localMatrix) {
return t->makeWithLocalMatrix(*localMatrix);
}
return t;
}
SkLocalMatrixShader(sk_sp<SkShader> wrapped,
const SkMatrix& localMatrix)
: fLocalMatrix(localMatrix), fWrappedShader(std::move(wrapped)) {}
bool isOpaque()
const override {
return as_SB(fWrappedShader)->isOpaque(); }
bool isConstant()
const override;
GradientType asGradient(GradientInfo* info, SkMatrix* localMatrix)
const override;
ShaderType type()
const override {
return ShaderType::kLocalMatrix; }
sk_sp<SkShader> makeAsALocalMatrixShader(SkMatrix* localMatrix)
const override {
if (localMatrix) {
*localMatrix = fLocalMatrix;
}
return fWrappedShader;
}
const SkMatrix& localMatrix()
const {
return fLocalMatrix; }
sk_sp<SkShader> wrappedShader()
const {
return fWrappedShader; }
protected:
void flatten(SkWriteBuffer&)
const override;
#ifdef SK_ENABLE_LEGACY_SHADERCONTEXT
Context* onMakeContext(
const ContextRec&, SkArenaAlloc*)
const override;
#endif
SkImage* onIsAImage(SkMatrix* matrix, SkTileMode* mode)
const override;
bool onAsLuminanceColor(SkColor4f*)
const override;
bool appendStages(
const SkStageRec&,
const SkShaders::MatrixRec&)
const override
;
private:
SK_FLATTENABLE_HOOKS(SkLocalMatrixShader)
SkMatrix fLocalMatrix;
sk_sp<SkShader> fWrappedShader;
};
/**
* 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);
bool isOpaque() const override { return fProxyShader->isOpaque(); }
bool isConstant() const override;
GradientType asGradient(GradientInfo* info, SkMatrix* localMatrix) const override;
ShaderType type() const override { return ShaderType::kCTM; }
const SkMatrix& ctm() const { return fCTM; }
sk_sp<SkShader> proxyShader() const { return fProxyShader; }
protected:
void flatten(SkWriteBuffer&) const override { SkASSERT(false); }
bool appendStages(const SkStageRec& rec, const SkShaders::MatrixRec&) const override;
private:
SK_FLATTENABLE_HOOKS(SkCTMShader)
sk_sp<SkShader> fProxyShader;
SkMatrix fCTM;
};
#endif
