SkColorFilterBase.h

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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.
 */
 
#ifndef SkColorFilterBase_DEFINED
#define SkColorFilterBase_DEFINED
 
#include "include/core/SkColor.h"
#include "include/core/SkColorFilter.h"
#include "include/core/SkFlattenable.h"
#include "include/core/SkRefCnt.h"
#include "include/private/SkColorData.h"
 
#include <cstddef>
 
class SkColorSpace;
class SkRuntimeEffect;
enum class SkBlendMode;
struct SkDeserialProcs;
struct SkStageRec;
 
#define SK_ALL_COLOR_FILTERS(M) \
    M(BlendMode)                \
    M(ColorSpaceXform)          \
    M(Compose)                  \
    M(Gaussian)                 \
    M(Matrix)                   \
    M(Runtime)                  \
    M(Table)                    \
    M(WorkingFormat)
 
class SkColorFilterBase : public SkColorFilter {
public:
    [[nodiscard]] virtual bool appendStages(const SkStageRec& rec, bool shaderIsOpaque) const = 0;
 
    /** Returns the flags for this filter. Override in subclasses to return custom flags.
    */
    virtual bool onIsAlphaUnchanged() const { return false; }
 
    enum class Type {
        // Used for stubs/tests
        kNoop,
#define M(type) k##type,
        SK_ALL_COLOR_FILTERS(M)
#undef M
 
    };
 
    virtual Type type() const = 0;
 
    bool affectsTransparentBlack() const {
        return this->filterColor4f(SkColors::kTransparent, nullptr, nullptr) !=
               SkColors::kTransparent;
    }
 
    virtual SkRuntimeEffect* asRuntimeEffect() const { return nullptr; }
 
    static SkFlattenable::Type GetFlattenableType() {
        return kSkColorFilter_Type;
    }
 
    SkFlattenable::Type getFlattenableType() const override {
        return kSkColorFilter_Type;
    }
 
    static sk_sp<SkColorFilter> Deserialize(const void* data, size_t size,
                                          const SkDeserialProcs* procs = nullptr) {
        return sk_sp<SkColorFilter>(static_cast<SkColorFilter*>(
                                  SkFlattenable::Deserialize(
                                  kSkColorFilter_Type, data, size, procs).release()));
    }
 
    virtual SkPMColor4f onFilterColor4f(const SkPMColor4f& color, SkColorSpace* dstCS) const;
 
protected:
    SkColorFilterBase() {}
 
    virtual bool onAsAColorMatrix(float[20]) const;
    virtual bool onAsAColorMode(SkColor* color, SkBlendMode* bmode) const;
 
private:
    friend class SkColorFilter;
 
    using INHERITED = SkFlattenable;
};
 
static inline SkColorFilterBase* as_CFB(SkColorFilter* filter) {
    return static_cast<SkColorFilterBase*>(filter);
}
 
static inline const SkColorFilterBase* as_CFB(const SkColorFilter* filter) {
    return static_cast<const SkColorFilterBase*>(filter);
}
 
static inline const SkColorFilterBase* as_CFB(const sk_sp<SkColorFilter>& filter) {
    return static_cast<SkColorFilterBase*>(filter.get());
}
 
static inline sk_sp<SkColorFilterBase> as_CFB_sp(sk_sp<SkColorFilter> filter) {
    return sk_sp<SkColorFilterBase>(static_cast<SkColorFilterBase*>(filter.release()));
}
 
void SkRegisterComposeColorFilterFlattenable();
void SkRegisterMatrixColorFilterFlattenable();
void SkRegisterModeColorFilterFlattenable();
void SkRegisterSkColorSpaceXformColorFilterFlattenable();
void SkRegisterTableColorFilterFlattenable();
void SkRegisterWorkingFormatColorFilterFlattenable();
 
#endif