Home | History | Annotate | Download | only in rendering 
      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/page/Frame.h"
     32 #include "core/page/FrameView.h"
     33 #include "core/page/Page.h"
     34 #include "core/rendering/PaintInfo.h"
     35 #include "core/rendering/RenderView.h"
     36 
     37 namespace WebCore {
     38 
     39 using namespace HTMLNames;
     40 
     41 RenderHTMLCanvas::RenderHTMLCanvas(HTMLCanvasElement* element)
     42     : RenderReplaced(element, element->size())
     43 {
     44     view()->frameView()->setIsVisuallyNonEmpty();
     45 }
     46 
     47 bool RenderHTMLCanvas::requiresLayer() const
     48 {
     49     if (RenderReplaced::requiresLayer())
     50         return true;
     51 
     52     HTMLCanvasElement* canvas = toHTMLCanvasElement(node());
     53     return canvas && canvas->renderingContext() && canvas->renderingContext()->isAccelerated();
     54 }
     55 
     56 void RenderHTMLCanvas::paintReplaced(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
     57 {
     58     LayoutRect rect = contentBoxRect();
     59     rect.moveBy(paintOffset);
     60 
     61     if (Frame* frame = this->frame()) {
     62         if (Page* page = frame->page()) {
     63             if (paintInfo.phase == PaintPhaseForeground)
     64                 page->addRelevantRepaintedObject(this, rect);
     65         }
     66     }
     67 
     68     bool useLowQualityScale = style()->imageRendering() == ImageRenderingOptimizeContrast;
     69     toHTMLCanvasElement(node())->paint(paintInfo.context, rect, useLowQualityScale);
     70 }
     71 
     72 void RenderHTMLCanvas::canvasSizeChanged()
     73 {
     74     IntSize canvasSize = toHTMLCanvasElement(node())->size();
     75     LayoutSize zoomedSize(canvasSize.width() * style()->effectiveZoom(), canvasSize.height() * style()->effectiveZoom());
     76 
     77     if (zoomedSize == intrinsicSize())
     78         return;
     79 
     80     setIntrinsicSize(zoomedSize);
     81 
     82     if (!parent())
     83         return;
     84 
     85     if (!preferredLogicalWidthsDirty())
     86         setPreferredLogicalWidthsDirty(true);
     87 
     88     LayoutSize oldSize = size();
     89     updateLogicalWidth();
     90     updateLogicalHeight();
     91     if (oldSize == size())
     92         return;
     93 
     94     if (!selfNeedsLayout())
     95         setNeedsLayout();
     96 }
     97 
     98 } // namespace WebCore
     99