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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 "Document.h"
     30 #include "GraphicsContext.h"
     31 #include "HTMLCanvasElement.h"
     32 #include "HTMLNames.h"
     33 #include "RenderView.h"
     34 #include "FrameView.h"
     35 
     36 namespace WebCore {
     37 
     38 using namespace HTMLNames;
     39 
     40 RenderHTMLCanvas::RenderHTMLCanvas(HTMLCanvasElement* element)
     41     : RenderReplaced(element, element->size())
     42 {
     43     view()->frameView()->setIsVisuallyNonEmpty();
     44 }
     45 
     46 bool RenderHTMLCanvas::requiresLayer() const
     47 {
     48     if (RenderReplaced::requiresLayer())
     49         return true;
     50 
     51 #if ENABLE(3D_CANVAS)
     52     HTMLCanvasElement* canvas = static_cast<HTMLCanvasElement*>(node());
     53     return canvas && canvas->is3D();
     54 #else
     55     return false;
     56 #endif
     57 }
     58 
     59 void RenderHTMLCanvas::paintReplaced(PaintInfo& paintInfo, int tx, int ty)
     60 {
     61     IntRect rect = contentBoxRect();
     62     rect.move(tx, ty);
     63     static_cast<HTMLCanvasElement*>(node())->paint(paintInfo.context, rect);
     64 }
     65 
     66 void RenderHTMLCanvas::canvasSizeChanged()
     67 {
     68     IntSize canvasSize = static_cast<HTMLCanvasElement*>(node())->size();
     69     IntSize zoomedSize(canvasSize.width() * style()->effectiveZoom(), canvasSize.height() * style()->effectiveZoom());
     70 
     71     if (zoomedSize == intrinsicSize())
     72         return;
     73 
     74     setIntrinsicSize(zoomedSize);
     75 
     76     if (!parent())
     77         return;
     78 
     79     if (!prefWidthsDirty())
     80         setPrefWidthsDirty(true);
     81 
     82     IntSize oldSize = size();
     83     calcWidth();
     84     calcHeight();
     85     if (oldSize == size())
     86         return;
     87 
     88     if (!selfNeedsLayout())
     89         setNeedsLayout(true);
     90 }
     91 
     92 } // namespace WebCore
     93