Source/platform/graphics/ReplayingCanvas.cpp

/*
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "config.h"
#include "platform/graphics/ReplayingCanvas.h"

#include "third_party/skia/include/core/SkBitmapDevice.h"

namespace blink {

CanvasInterceptor<ReplayingCanvas>::~CanvasInterceptor()
{
    if (topLevelCall())
        canvas()->updateInRange();
}

ReplayingCanvas::ReplayingCanvas(SkBitmap bitmap, unsigned fromStep, unsigned toStep)
    : InterceptingCanvas(bitmap), m_fromStep(fromStep), m_toStep(toStep), m_abortDrawing(false)
{
}

void ReplayingCanvas::updateInRange()
{
    if (m_abortDrawing)
        return;
    unsigned step = callCount() + 1;
    if (m_toStep && step > m_toStep)
        m_abortDrawing = true;
    if (step == m_fromStep)
        this->SkCanvas::clear(SkColorSetARGB(255, 255, 255, 255)); // FIXME: fill with nine patch instead.
}

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

SkCanvas::SaveLayerStrategy ReplayingCanvas::willSaveLayer(const SkRect* bounds, const SkPaint* paint, SaveFlags flags)
{
    // 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() <= m_fromStep)
        this->SkCanvas::clear(SkColorSetARGB(255, 255, 255, 255)); // FIXME: fill with nine patch instead.

    return this->InterceptingCanvas<ReplayingCanvas>::willSaveLayer(bounds, paint, flags);
}

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

} // namespace blink