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/*
* Copyright 2021 Google LLC
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkBlenderBase_DEFINED
#define SkBlenderBase_DEFINED
#include "include/core/SkBlender.h"
#include "src/base/SkArenaAlloc.h"
#include <memory>
#include <optional>
struct GrFPArgs;
class GrFragmentProcessor;
class SkColorInfo;
class SkRuntimeEffect;
struct SkStageRec;
namespace skgpu::graphite {
enum class DstColorType;
class KeyContext;
class PaintParamsKeyBuilder;
class PipelineDataGatherer;
}
#define SK_ALL_BLENDERS(M) \
M(BlendMode) \
M(Runtime)
/**
* Encapsulates a blend function, including non-public APIs.
* Blends combine a source color (the result of our paint) and destination color (from the canvas)
* into a final color.
*/
class SkBlenderBase : public SkBlender {
public:
/**
* Returns true if this SkBlender represents any SkBlendMode, and returns the blender's
* SkBlendMode in `mode`. Returns false for other types of blends.
*/
virtual std::optional<SkBlendMode> asBlendMode() const { return {}; }
bool affectsTransparentBlack() const;
[[nodiscard]] bool appendStages(const SkStageRec& rec) const {
return this->onAppendStages(rec);
}
[[nodiscard]] virtual bool onAppendStages(const SkStageRec& rec) const = 0;
virtual SkRuntimeEffect* asRuntimeEffect() const { return nullptr; }
static SkFlattenable::Type GetFlattenableType() { return kSkBlender_Type; }
SkFlattenable::Type getFlattenableType() const override { return GetFlattenableType(); }
enum class BlenderType {
#define M(type) k ## type,
SK_ALL_BLENDERS(M)
#undef M
};
virtual BlenderType type() const = 0;
};
inline SkBlenderBase* as_BB(SkBlender* blend) {
return static_cast<SkBlenderBase*>(blend);
}
inline const SkBlenderBase* as_BB(const SkBlender* blend) {
return static_cast<const SkBlenderBase*>(blend);
}
inline const SkBlenderBase* as_BB(const sk_sp<SkBlender>& blend) {
return static_cast<SkBlenderBase*>(blend.get());
}
#endif // SkBlenderBase_DEFINED