src/shaders/SkRuntimeShader.h

/*
 * 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 SkRuntimeShader_DEFINED
#define SkRuntimeShader_DEFINED

#include "include/core/SkData.h"
#include "include/core/SkFlattenable.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkSpan.h"
#include "include/effects/SkRuntimeEffect.h"
#include "include/private/SkDebug.h"
#include "src/core/SkRuntimeEffectPriv.h"
#include "src/shaders/SkShaderBase.h"
#include "src/sksl/tracing/SkSLDebugTracePriv.h"

#include <vector>

class SkColorSpace;
class SkReadBuffer;
class SkWriteBuffer;
struct SkIPoint;
struct SkStageRec;

using UniformsCallback = SkRuntimeEffectPriv::UniformsCallback;

class SkRuntimeShader : public SkShaderBase {
public:
    SkRuntimeShader(sk_sp<SkRuntimeEffect> effect,
                    sk_sp<SkSL::DebugTracePriv> debugTrace,
                    sk_sp<const SkData> uniforms,
                    SkSpan<const SkRuntimeEffect::ChildPtr> children);

    SkRuntimeShader(sk_sp<SkRuntimeEffect> effect,
                    sk_sp<SkSL::DebugTracePriv> debugTrace,
                    UniformsCallback uniformsCallback,
                    SkSpan<const SkRuntimeEffect::ChildPtr> children);

    SkRuntimeEffect::TracedShader makeTracedClone(const SkIPoint& coord);

    bool isOpaque() const override { return fEffect->alwaysOpaque(); }

    ShaderType type() const override { return ShaderType::kRuntime; }

    bool appendStages(const SkStageRec& rec, const SkShaders::MatrixRec& mRec) const override;

    void flatten(SkWriteBuffer& buffer) const override;

    SkRuntimeEffect* asRuntimeEffect() const override { return fEffect.get(); }

    sk_sp<SkRuntimeEffect> effect() const { return fEffect; }
    SkSpan<const SkRuntimeEffect::ChildPtr> children() const { return fChildren; }

    sk_sp<const SkData> uniformData(const SkColorSpace* dstCS) const;

    SK_FLATTENABLE_HOOKS(SkRuntimeShader)

private:
    enum Flags {
        kHasLegacyLocalMatrix_Flag = 1 << 1,
    };

    sk_sp<SkRuntimeEffect> fEffect;
    sk_sp<SkSL::DebugTracePriv> fDebugTrace;
    sk_sp<const SkData> fUniformData;
    UniformsCallback fUniformsCallback;
    std::vector<SkRuntimeEffect::ChildPtr> fChildren;
};

#endif