src/third_party/WebKit/Source/core/rendering/RenderHTMLCanvas.cpp

   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         setNeedsLayoutAndFullPaintInvalidation();
  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