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      1 /*
      2  * Copyright (C) 2010 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 
     33 #if USE(ACCELERATED_COMPOSITING)
     34 
     35 #include "ImageLayerChromium.h"
     36 
     37 #include "cc/CCLayerImpl.h"
     38 #include "Image.h"
     39 #include "LayerRendererChromium.h"
     40 #include "LayerTexture.h"
     41 
     42 namespace WebCore {
     43 
     44 PassRefPtr<ImageLayerChromium> ImageLayerChromium::create(GraphicsLayerChromium* owner)
     45 {
     46     return adoptRef(new ImageLayerChromium(owner));
     47 }
     48 
     49 ImageLayerChromium::ImageLayerChromium(GraphicsLayerChromium* owner)
     50     : ContentLayerChromium(owner)
     51     , m_imageForCurrentFrame(0)
     52     , m_contents(0)
     53 {
     54 }
     55 
     56 void ImageLayerChromium::setContents(Image* contents)
     57 {
     58     // setContents() currently gets called whenever there is any
     59     // style change that affects the layer even if that change doesn't
     60     // affect the actual contents of the image (e.g. a CSS animation).
     61     // With this check in place we avoid unecessary texture uploads.
     62     if ((m_contents == contents) && (m_contents->nativeImageForCurrentFrame() == m_imageForCurrentFrame))
     63         return;
     64 
     65     m_contents = contents;
     66     m_imageForCurrentFrame = m_contents->nativeImageForCurrentFrame();
     67     m_dirtyRect = IntRect(IntPoint(0, 0), bounds());
     68     setNeedsDisplay();
     69 }
     70 
     71 void ImageLayerChromium::paintContentsIfDirty(const IntRect&)
     72 {
     73     ASSERT(layerRenderer());
     74 
     75     if (!m_dirtyRect.isEmpty()) {
     76         m_decodedImage.updateFromImage(m_contents->nativeImageForCurrentFrame());
     77         updateLayerSize(m_decodedImage.size());
     78         IntRect paintRect(IntPoint(0, 0), m_decodedImage.size());
     79         if (!m_dirtyRect.isEmpty()) {
     80             m_tiler->invalidateRect(paintRect);
     81             m_dirtyRect = IntRect();
     82         }
     83     }
     84 }
     85 
     86 void ImageLayerChromium::updateCompositorResources()
     87 {
     88     IntRect paintRect(IntPoint(0, 0), m_decodedImage.size());
     89     m_tiler->updateFromPixels(paintRect, paintRect, m_decodedImage.pixels());
     90 }
     91 
     92 IntRect ImageLayerChromium::layerBounds() const
     93 {
     94     return IntRect(IntPoint(0, 0), m_decodedImage.size());
     95 }
     96 
     97 TransformationMatrix ImageLayerChromium::tilingTransform()
     98 {
     99     // Tiler draws from the upper left corner. The draw transform
    100     // specifies the middle of the layer.
    101     TransformationMatrix transform = ccLayerImpl()->drawTransform();
    102     const IntRect sourceRect = layerBounds();
    103     const IntSize destSize = bounds();
    104 
    105     transform.translate(-destSize.width() / 2.0, -destSize.height() / 2.0);
    106 
    107     // Tiler also draws at the original content size, so rescale the original
    108     // image dimensions to the bounds that it is meant to be drawn at.
    109     float scaleX = destSize.width() / static_cast<float>(sourceRect.size().width());
    110     float scaleY = destSize.height() / static_cast<float>(sourceRect.size().height());
    111     transform.scale3d(scaleX, scaleY, 1.0f);
    112 
    113     return transform;
    114 }
    115 
    116 }
    117 #endif // USE(ACCELERATED_COMPOSITING)
    118