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      1 /*
      2  * Copyright (C) 2004, 2006, 2007 Apple 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
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "RenderHTMLCanvas.h"
     28 
     29 #include "CanvasRenderingContext.h"
     30 #include "Document.h"
     31 #include "FrameView.h"
     32 #include "GraphicsContext.h"
     33 #include "HTMLCanvasElement.h"
     34 #include "HTMLNames.h"
     35 #include "PaintInfo.h"
     36 #include "RenderView.h"
     37 
     38 namespace WebCore {
     39 
     40 using namespace HTMLNames;
     41 
     42 RenderHTMLCanvas::RenderHTMLCanvas(HTMLCanvasElement* element)
     43     : RenderReplaced(element, element->size())
     44 {
     45     view()->frameView()->setIsVisuallyNonEmpty();
     46 }
     47 
     48 bool RenderHTMLCanvas::requiresLayer() const
     49 {
     50 #if PLATFORM(ANDROID)
     51     // All Canvas are drawn on their own composited layer
     52     // This improves performances a lot (as this simplify
     53     // the repaint/inval chain dealing with the PictureSet)
     54     return true;
     55 #endif
     56 
     57     if (RenderReplaced::requiresLayer())
     58         return true;
     59 
     60     HTMLCanvasElement* canvas = static_cast<HTMLCanvasElement*>(node());
     61     return canvas && canvas->renderingContext() && canvas->renderingContext()->isAccelerated();
     62 }
     63 
     64 void RenderHTMLCanvas::paintReplaced(PaintInfo& paintInfo, int tx, int ty)
     65 {
     66     IntRect rect = contentBoxRect();
     67     rect.move(tx, ty);
     68     static_cast<HTMLCanvasElement*>(node())->paint(paintInfo.context, rect);
     69 }
     70 
     71 void RenderHTMLCanvas::canvasSizeChanged()
     72 {
     73     IntSize canvasSize = static_cast<HTMLCanvasElement*>(node())->size();
     74     IntSize zoomedSize(canvasSize.width() * style()->effectiveZoom(), canvasSize.height() * style()->effectiveZoom());
     75 
     76     if (zoomedSize == intrinsicSize())
     77         return;
     78 
     79     setIntrinsicSize(zoomedSize);
     80 
     81     if (!parent())
     82         return;
     83 
     84     if (!preferredLogicalWidthsDirty())
     85         setPreferredLogicalWidthsDirty(true);
     86 
     87     IntSize oldSize = size();
     88     computeLogicalWidth();
     89     computeLogicalHeight();
     90     if (oldSize == size())
     91         return;
     92 
     93     if (!selfNeedsLayout())
     94         setNeedsLayout(true);
     95 }
     96 
     97 } // namespace WebCore
     98