MotionBlurEffect.h

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/*
 * Copyright 2019 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#ifndef SkottieMotionBlurEffect_DEFINED
#define SkottieMotionBlurEffect_DEFINED
 
#include "modules/sksg/include/SkSGRenderNode.h"
 
namespace skottie {
namespace internal {
 
class Animator;
 
class MotionBlurEffect final : public sksg::CustomRenderNode {
public:
    static sk_sp<MotionBlurEffect> Make(sk_sp<Animator> animator,
                                        sk_sp<sksg::RenderNode> child,
                                        size_t samples_per_frame,
                                        float shutter_angle, float shutter_phase);
 
    SG_ATTRIBUTE(T, float, fT)
 
private:
    class AutoInvalBlocker;
 
    const RenderNode* onNodeAt(const SkPoint&) const override;
 
    SkRect onRevalidate(sksg::InvalidationController* ic, const SkMatrix& ctm) override;
 
    void onRender(SkCanvas* canvas, const RenderContext* ctx) const override;
 
    void renderToRaster8888Pow2Samples(SkCanvas* canvas, const RenderContext* ctx) const;
 
    SkRect seekToSample(size_t sample_idx, const SkMatrix& ctm) const;
 
    MotionBlurEffect(sk_sp<Animator> animator,
                     sk_sp<sksg::RenderNode> child,
                     size_t sample_count, float phase, float dt);
 
    const sk_sp<Animator> fAnimator;
    const size_t          fSampleCount;
    const float           fPhase,
                          fDT;
 
    float  fT                  = 0;
    size_t fVisibleSampleCount = 0;
 
    using INHERITED = sksg::CustomRenderNode;
};
 
} // namespace internal
} // namespace skottie
 
#endif // SkottieMotionBlurEffect_DEFINED