Source/core/svg/graphics/SVGImageChromeClient.cpp

/*
 * Copyright (C) 2012 Apple Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions
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 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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#include "config.h"
#include "core/svg/graphics/SVGImageChromeClient.h"

#include "core/frame/FrameView.h"
#include "core/svg/graphics/SVGImage.h"
#include "platform/graphics/ImageObserver.h"
#include "wtf/CurrentTime.h"

namespace WebCore {

static const double animationFrameDelay = 0.025;

SVGImageChromeClient::SVGImageChromeClient(SVGImage* image)
    : m_image(image)
    , m_animationTimer(this, &SVGImageChromeClient::animationTimerFired)
{
}

bool SVGImageChromeClient::isSVGImageChromeClient() const
{
    return true;
}

void SVGImageChromeClient::chromeDestroyed()
{
    m_image = 0;
}

void SVGImageChromeClient::invalidateContentsAndRootView(const IntRect& r)
{
    // If m_image->m_page is null, we're being destructed, don't fire changedInRect() in that case.
    if (m_image && m_image->imageObserver() && m_image->m_page)
        m_image->imageObserver()->changedInRect(m_image, r);
}

void SVGImageChromeClient::scheduleAnimation()
{
    // Because a single SVGImage can be shared by multiple pages, we can't key
    // our svg image layout on the page's real animation frame. Therefore, we
    // run this fake animation timer to trigger layout in SVGImages. The name,
    // "animationTimer", is to match the new requestAnimationFrame-based layout
    // approach.
    if (m_animationTimer.isActive())
        return;
    // Schedule the 'animation' ASAP if the image does not contain any
    // animations, but prefer a fixed, jittery, frame-delay if there're any
    // animations. Checking for pending/active animations could be more
    // stringent.
    double fireTime = m_image->hasAnimations() ? animationFrameDelay : 0;
    m_animationTimer.startOneShot(fireTime, FROM_HERE);
}

void SVGImageChromeClient::animationTimerFired(Timer<SVGImageChromeClient>*)
{
    // In principle, we should call requestAnimationFrame callbacks here, but
    // we know there aren't any because script is forbidden inside SVGImages.
    if (m_image) {
        m_image->frameView()->page()->animator().serviceScriptedAnimations(currentTime());
        m_image->frameView()->updateLayoutAndStyleForPainting();
    }
}

}