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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 (RenderReplaced::requiresLayer())
     51         return true;
     52 
     53     HTMLCanvasElement* canvas = static_cast<HTMLCanvasElement*>(node());
     54     return canvas && canvas->renderingContext() && canvas->renderingContext()->isAccelerated();
     55 }
     56 
     57 void RenderHTMLCanvas::paintReplaced(PaintInfo& paintInfo, int tx, int ty)
     58 {
     59     IntRect rect = contentBoxRect();
     60     rect.move(tx, ty);
     61     static_cast<HTMLCanvasElement*>(node())->paint(paintInfo.context, rect);
     62 }
     63 
     64 void RenderHTMLCanvas::canvasSizeChanged()
     65 {
     66     IntSize canvasSize = static_cast<HTMLCanvasElement*>(node())->size();
     67     IntSize zoomedSize(canvasSize.width() * style()->effectiveZoom(), canvasSize.height() * style()->effectiveZoom());
     68 
     69     if (zoomedSize == intrinsicSize())
     70         return;
     71 
     72     setIntrinsicSize(zoomedSize);
     73 
     74     if (!parent())
     75         return;
     76 
     77     if (!preferredLogicalWidthsDirty())
     78         setPreferredLogicalWidthsDirty(true);
     79 
     80     IntSize oldSize = size();
     81     computeLogicalWidth();
     82     computeLogicalHeight();
     83     if (oldSize == size())
     84         return;
     85 
     86     if (!selfNeedsLayout())
     87         setNeedsLayout(true);
     88 }
     89 
     90 } // namespace WebCore
     91