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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 "core/rendering/RenderHTMLCanvas.h"
     28 
     29 #include "core/html/HTMLCanvasElement.h"
     30 #include "core/html/canvas/CanvasRenderingContext.h"
     31 #include "core/frame/FrameView.h"
     32 #include "core/frame/LocalFrame.h"
     33 #include "core/page/Page.h"
     34 #include "core/paint/HTMLCanvasPainter.h"
     35 #include "core/rendering/PaintInfo.h"
     36 #include "core/rendering/RenderView.h"
     37 
     38 namespace blink {
     39 
     40 using namespace HTMLNames;
     41 
     42 RenderHTMLCanvas::RenderHTMLCanvas(HTMLCanvasElement* element)
     43     : RenderReplaced(element, element->size())
     44 {
     45     view()->frameView()->setIsVisuallyNonEmpty();
     46 }
     47 
     48 LayerType RenderHTMLCanvas::layerTypeRequired() const
     49 {
     50     return NormalLayer;
     51 }
     52 
     53 void RenderHTMLCanvas::paintReplaced(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
     54 {
     55     HTMLCanvasPainter(*this).paintReplaced(paintInfo, paintOffset);
     56 }
     57 
     58 void RenderHTMLCanvas::canvasSizeChanged()
     59 {
     60     IntSize canvasSize = toHTMLCanvasElement(node())->size();
     61     LayoutSize zoomedSize(canvasSize.width() * style()->effectiveZoom(), canvasSize.height() * style()->effectiveZoom());
     62 
     63     if (zoomedSize == intrinsicSize())
     64         return;
     65 
     66     setIntrinsicSize(zoomedSize);
     67 
     68     if (!parent())
     69         return;
     70 
     71     if (!preferredLogicalWidthsDirty())
     72         setPreferredLogicalWidthsDirty();
     73 
     74     LayoutSize oldSize = size();
     75     updateLogicalWidth();
     76     updateLogicalHeight();
     77     if (oldSize == size())
     78         return;
     79 
     80     if (!selfNeedsLayout())
     81         setNeedsLayout();
     82 }
     83 
     84 CompositingReasons RenderHTMLCanvas::additionalCompositingReasons() const
     85 {
     86     HTMLCanvasElement* canvas = toHTMLCanvasElement(node());
     87     if (canvas->renderingContext() && canvas->renderingContext()->isAccelerated())
     88         return CompositingReasonCanvas;
     89 
     90     return CompositingReasonNone;
     91 }
     92 
     93 } // namespace blink
     94