chromium/src/third_party/blink/renderer/platform/graphics/replaying_canvas.cc

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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#include "third_party/blink/renderer/platform/graphics/replaying_canvas.h"

namespace blink {

CanvasInterceptor<ReplayingCanvas>::~CanvasInterceptor() {
  if (TopLevelCall())
    Canvas()->UpdateInRange();
}

ReplayingCanvas::ReplayingCanvas(SkBitmap bitmap,
                                 unsigned from_step,
                                 unsigned to_step)
    : InterceptingCanvas(bitmap),
      from_step_(from_step),
      to_step_(to_step),
      abort_drawing_(false) {}

void ReplayingCanvas::UpdateInRange() {
  if (abort_drawing_)
    return;
  unsigned step = CallCount() + 1;
  if (to_step_ && step > to_step_)
    abort_drawing_ = true;
  if (step == from_step_)
    this->SkCanvas::clear(SK_ColorTRANSPARENT);
}

bool ReplayingCanvas::abort() {
  return abort_drawing_;
}

SkCanvas::SaveLayerStrategy ReplayingCanvas::getSaveLayerStrategy(
    const SaveLayerRec& rec) {
  // We're about to create a layer and we have not cleared the device yet.
  // Let's clear now, so it has effect on all layers.
  if (CallCount() <= from_step_)
    this->SkCanvas::clear(SK_ColorTRANSPARENT);

  return this->InterceptingCanvas<ReplayingCanvas>::getSaveLayerStrategy(rec);
}

void ReplayingCanvas::onDrawPicture(const SkPicture* picture,
                                    const SkMatrix* matrix,
                                    const SkPaint* paint) {
  this->UnrollDrawPicture(picture, matrix, paint, this);
}

}  // namespace blink