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 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 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 "Frame.h" 32#include "FrameView.h" 33#include "GraphicsContext.h" 34#include "HTMLCanvasElement.h" 35#include "HTMLNames.h" 36#include "Page.h" 37#include "PaintInfo.h" 38#include "RenderView.h" 39 40namespace WebCore { 41 42using namespace HTMLNames; 43 44RenderHTMLCanvas::RenderHTMLCanvas(HTMLCanvasElement& element, PassRef<RenderStyle> style) 45 : RenderReplaced(element, WTF::move(style), element.size()) 46{ 47 // Actual size is not known yet, report the default intrinsic size. 48 view().frameView().incrementVisuallyNonEmptyPixelCount(roundedIntSize(intrinsicSize())); 49} 50 51HTMLCanvasElement& RenderHTMLCanvas::canvasElement() const 52{ 53 return toHTMLCanvasElement(nodeForNonAnonymous()); 54} 55 56bool RenderHTMLCanvas::requiresLayer() const 57{ 58 if (RenderReplaced::requiresLayer()) 59 return true; 60 61 if (CanvasRenderingContext* context = canvasElement().renderingContext()) 62 return context->isAccelerated(); 63 64 return false; 65} 66 67void RenderHTMLCanvas::paintReplaced(PaintInfo& paintInfo, const LayoutPoint& paintOffset) 68{ 69 GraphicsContext* context = paintInfo.context; 70 71 LayoutRect contentRect = contentBoxRect(); 72 contentRect.moveBy(paintOffset); 73 LayoutRect paintRect = replacedContentRect(intrinsicSize()); 74 paintRect.moveBy(paintOffset); 75 76 // Not allowed to overflow the content box. 77 bool clip = !contentRect.contains(paintRect); 78 GraphicsContextStateSaver stateSaver(*paintInfo.context, clip); 79 if (clip) 80 paintInfo.context->clip(pixelSnappedIntRect(contentRect)); 81 82 if (Page* page = frame().page()) { 83 if (paintInfo.phase == PaintPhaseForeground) 84 page->addRelevantRepaintedObject(this, intersection(paintRect, contentRect)); 85 } 86 87 bool useLowQualityScale = style().imageRendering() == ImageRenderingCrispEdges || style().imageRendering() == ImageRenderingOptimizeSpeed; 88 canvasElement().paint(context, paintRect, useLowQualityScale); 89} 90 91void RenderHTMLCanvas::canvasSizeChanged() 92{ 93 IntSize canvasSize = canvasElement().size(); 94 LayoutSize zoomedSize(canvasSize.width() * style().effectiveZoom(), canvasSize.height() * style().effectiveZoom()); 95 96 if (zoomedSize == intrinsicSize()) 97 return; 98 99 setIntrinsicSize(zoomedSize); 100 101 if (!parent()) 102 return; 103 104 if (!preferredLogicalWidthsDirty()) 105 setPreferredLogicalWidthsDirty(true); 106 107 LayoutSize oldSize = size(); 108 updateLogicalWidth(); 109 updateLogicalHeight(); 110 if (oldSize == size()) 111 return; 112 113 if (!selfNeedsLayout()) 114 setNeedsLayout(); 115} 116 117} // namespace WebCore 118