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diff --git a/Source/WebCore/rendering/RenderVideo.cpp b/Source/WebCore/rendering/RenderVideo.cpp
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+/*
+ * Copyright (C) 2007, 2008, 2009, 2010 Apple Inc.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+
+#if ENABLE(VIDEO)
+#include "RenderVideo.h"
+
+#include "Document.h"
+#include "FrameView.h"
+#include "GraphicsContext.h"
+#include "HTMLNames.h"
+#include "HTMLVideoElement.h"
+#include "MediaPlayer.h"
+#include "RenderView.h"
+
+#if USE(ACCELERATED_COMPOSITING)
+#include "RenderLayer.h"
+#include "RenderLayerBacking.h"
+#endif
+
+using namespace std;
+
+namespace WebCore {
+
+using namespace HTMLNames;
+
+RenderVideo::RenderVideo(HTMLVideoElement* video)
+    : RenderMedia(video)
+{
+    setIntrinsicSize(calculateIntrinsicSize());
+}
+
+RenderVideo::~RenderVideo()
+{
+    if (MediaPlayer* p = player()) {
+        p->setVisible(false);
+        p->setFrameView(0);
+    }
+}
+
+IntSize RenderVideo::defaultSize()
+{
+    // These values are specified in the spec.
+    static const int cDefaultWidth = 300;
+    static const int cDefaultHeight = 150;
+
+    return IntSize(cDefaultWidth, cDefaultHeight);
+}
+
+void RenderVideo::intrinsicSizeChanged()
+{
+    if (videoElement()->shouldDisplayPosterImage())
+        RenderMedia::intrinsicSizeChanged();
+    updateIntrinsicSize(); 
+}
+
+void RenderVideo::updateIntrinsicSize()
+{
+    IntSize size = calculateIntrinsicSize();
+    size.scale(style()->effectiveZoom());
+
+    // Never set the element size to zero when in a media document.
+    if (size.isEmpty() && node()->ownerDocument() && node()->ownerDocument()->isMediaDocument())
+        return;
+
+    if (size == intrinsicSize())
+        return;
+
+    setIntrinsicSize(size);
+    setPreferredLogicalWidthsDirty(true);
+    setNeedsLayout(true);
+}
+    
+IntSize RenderVideo::calculateIntrinsicSize()
+{
+    HTMLVideoElement* video = videoElement();
+    
+    // Spec text from 4.8.6
+    //
+    // The intrinsic width of a video element's playback area is the intrinsic width 
+    // of the video resource, if that is available; otherwise it is the intrinsic 
+    // width of the poster frame, if that is available; otherwise it is 300 CSS pixels.
+    //
+    // The intrinsic height of a video element's playback area is the intrinsic height 
+    // of the video resource, if that is available; otherwise it is the intrinsic 
+    // height of the poster frame, if that is available; otherwise it is 150 CSS pixels.
+    
+    if (player() && video->readyState() >= HTMLVideoElement::HAVE_METADATA)
+        return player()->naturalSize();
+
+    if (video->shouldDisplayPosterImage() && !m_cachedImageSize.isEmpty() && !imageResource()->errorOccurred())
+        return m_cachedImageSize;
+
+    // When the natural size of the video is unavailable, we use the provided
+    // width and height attributes of the video element as the intrinsic size until
+    // better values become available. 
+    if (video->hasAttribute(widthAttr) && video->hasAttribute(heightAttr))
+        return IntSize(video->width(), video->height());
+
+    // <video> in standalone media documents should not use the default 300x150
+    // size since they also have audio-only files. By setting the intrinsic
+    // size to 300x1 the video will resize itself in these cases, and audio will
+    // have the correct height (it needs to be > 0 for controls to render properly).
+    if (video->ownerDocument() && video->ownerDocument()->isMediaDocument())
+        return IntSize(defaultSize().width(), 1);
+
+    return defaultSize();
+}
+
+void RenderVideo::imageChanged(WrappedImagePtr newImage, const IntRect* rect)
+{
+    RenderMedia::imageChanged(newImage, rect);
+
+    // Cache the image intrinsic size so we can continue to use it to draw the image correctly
+    // even if we know the video intrinsic size but aren't able to draw video frames yet
+    // (we don't want to scale the poster to the video size without keeping aspect ratio).
+    if (videoElement()->shouldDisplayPosterImage())
+        m_cachedImageSize = intrinsicSize();
+
+    // The intrinsic size is now that of the image, but in case we already had the
+    // intrinsic size of the video we call this here to restore the video size.
+    updateIntrinsicSize();
+}
+
+IntRect RenderVideo::videoBox() const
+{
+    if (m_cachedImageSize.isEmpty() && videoElement()->shouldDisplayPosterImage())
+        return IntRect();
+
+    IntSize elementSize;
+    if (videoElement()->shouldDisplayPosterImage())
+        elementSize = m_cachedImageSize;
+    else
+        elementSize = intrinsicSize();
+
+    IntRect contentRect = contentBoxRect();
+    if (elementSize.isEmpty() || contentRect.isEmpty())
+        return IntRect();
+
+    IntRect renderBox = contentRect;
+    int ratio = renderBox.width() * elementSize.height() - renderBox.height() * elementSize.width();
+    if (ratio > 0) {
+        int newWidth = renderBox.height() * elementSize.width() / elementSize.height();
+        // Just fill the whole area if the difference is one pixel or less (in both sides)
+        if (renderBox.width() - newWidth > 2)
+            renderBox.setWidth(newWidth);
+        renderBox.move((contentRect.width() - renderBox.width()) / 2, 0);
+    } else if (ratio < 0) {
+        int newHeight = renderBox.width() * elementSize.height() / elementSize.width();
+        if (renderBox.height() - newHeight > 2)
+            renderBox.setHeight(newHeight);
+        renderBox.move(0, (contentRect.height() - renderBox.height()) / 2);
+    }
+
+    return renderBox;
+}
+
+bool RenderVideo::shouldDisplayVideo() const
+{
+    return !videoElement()->shouldDisplayPosterImage();
+}
+
+void RenderVideo::paintReplaced(PaintInfo& paintInfo, int tx, int ty)
+{
+    MediaPlayer* mediaPlayer = player();
+    bool displayingPoster = videoElement()->shouldDisplayPosterImage();
+
+    if (!displayingPoster) {
+        if (!mediaPlayer)
+            return;
+        updatePlayer();
+    }
+
+    IntRect rect = videoBox();
+    if (rect.isEmpty())
+        return;
+    rect.move(tx, ty);
+
+    if (displayingPoster)
+        paintIntoRect(paintInfo.context, rect);
+    else
+        mediaPlayer->paint(paintInfo.context, rect);
+}
+
+void RenderVideo::layout()
+{
+    RenderMedia::layout();
+    updatePlayer();
+}
+    
+HTMLVideoElement* RenderVideo::videoElement() const
+{
+    ASSERT(node()->hasTagName(videoTag));
+    return static_cast<HTMLVideoElement*>(node()); 
+}
+
+void RenderVideo::updateFromElement()
+{
+    RenderMedia::updateFromElement();
+    updatePlayer();
+}
+
+void RenderVideo::updatePlayer()
+{
+    updateIntrinsicSize();
+
+    MediaPlayer* mediaPlayer = player();
+    if (!mediaPlayer)
+        return;
+
+    if (!videoElement()->inActiveDocument()) {
+        mediaPlayer->setVisible(false);
+        return;
+    }
+
+#if USE(ACCELERATED_COMPOSITING)
+    layer()->contentChanged(RenderLayer::VideoChanged);
+#endif
+    
+    IntRect videoBounds = videoBox(); 
+    mediaPlayer->setFrameView(document()->view());
+    mediaPlayer->setSize(IntSize(videoBounds.width(), videoBounds.height()));
+    mediaPlayer->setVisible(true);
+}
+
+int RenderVideo::computeReplacedLogicalWidth(bool includeMaxWidth) const
+{
+    return RenderReplaced::computeReplacedLogicalWidth(includeMaxWidth);
+}
+
+int RenderVideo::computeReplacedLogicalHeight() const
+{
+    return RenderReplaced::computeReplacedLogicalHeight();
+}
+
+int RenderVideo::minimumReplacedHeight() const 
+{
+    return RenderReplaced::minimumReplacedHeight(); 
+}
+
+#if USE(ACCELERATED_COMPOSITING)
+bool RenderVideo::supportsAcceleratedRendering() const
+{
+    MediaPlayer* p = player();
+    if (p)
+        return p->supportsAcceleratedRendering();
+
+    return false;
+}
+
+void RenderVideo::acceleratedRenderingStateChanged()
+{
+    MediaPlayer* p = player();
+    if (p)
+        p->acceleratedRenderingStateChanged();
+}
+#endif  // USE(ACCELERATED_COMPOSITING)
+
+} // namespace WebCore
+
+#endif