/*

 * Copyright 2018 Google Inc.

 *

 * Use of this source code is governed by a BSD-style license that can be

 * found in the LICENSE file.

 */

#ifndef SkSGOpacityEffect_DEFINED

#define SkSGOpacityEffect_DEFINED

#include "include/core/SkRect.h"

#include "include/core/SkRefCnt.h"

#include "modules/sksg/include/SkSGEffectNode.h"

#include "modules/sksg/include/SkSGNode.h"

#include "modules/sksg/include/SkSGRenderNode.h"

#include <utility>

class SkCanvas;

class SkMatrix;

struct SkPoint;

namespace sksg {

class InvalidationController;

/**

 * Concrete Effect node, applying opacity to its descendants.

 *

 */

class OpacityEffect final : public EffectNode {

public:

    static sk_sp<OpacityEffect> Make(sk_sp<RenderNode> child, float opacity = 1) {

        return child ? sk_sp<OpacityEffect>(new OpacityEffect(std::move(child), opacity)) : nullptr;

    }

    SG_ATTRIBUTE(Opacity, float, fOpacity)

protected:

    OpacityEffect(sk_sp<RenderNode>, float);

    void onRender(SkCanvas*, const RenderContext*) const override;

    const RenderNode* onNodeAt(const SkPoint&)     const override;

    SkRect onRevalidate(InvalidationController*, const SkMatrix&) override;

private:

    float fOpacity;

    using INHERITED = EffectNode;

};

} // namespace sksg

#endif // SkSGOpacityEffect_DEFINED