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/rendering/PaintInfo.h"
35 #include "core/rendering/RenderView.h"
36
37 namespace WebCore {
38
39 using namespace HTMLNames;
40
RenderHTMLCanvas(HTMLCanvasElement * element)41 RenderHTMLCanvas::RenderHTMLCanvas(HTMLCanvasElement* element)
42 : RenderReplaced(element, element->size())
43 {
44 view()->frameView()->setIsVisuallyNonEmpty();
45 }
46
layerTypeRequired() const47 LayerType RenderHTMLCanvas::layerTypeRequired() const
48 {
49 return NormalLayer;
50 }
51
paintReplaced(PaintInfo & paintInfo,const LayoutPoint & paintOffset)52 void RenderHTMLCanvas::paintReplaced(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
53 {
54 GraphicsContext* context = paintInfo.context;
55
56 LayoutRect contentRect = contentBoxRect();
57 contentRect.moveBy(paintOffset);
58 LayoutRect paintRect = replacedContentRect();
59 paintRect.moveBy(paintOffset);
60
61 bool clip = !contentRect.contains(paintRect);
62 if (clip) {
63 // Not allowed to overflow the content box.
64 paintInfo.context->save();
65 paintInfo.context->clip(pixelSnappedIntRect(contentRect));
66 }
67
68 // FIXME: InterpolationNone should be used if ImageRenderingOptimizeContrast is set.
69 // See bug for more details: crbug.com/353716.
70 InterpolationQuality interpolationQuality = style()->imageRendering() == ImageRenderingOptimizeContrast ? InterpolationLow : CanvasDefaultInterpolationQuality;
71 InterpolationQuality previousInterpolationQuality = context->imageInterpolationQuality();
72 context->setImageInterpolationQuality(interpolationQuality);
73 toHTMLCanvasElement(node())->paint(context, paintRect);
74 context->setImageInterpolationQuality(previousInterpolationQuality);
75
76 if (clip)
77 context->restore();
78 }
79
canvasSizeChanged()80 void RenderHTMLCanvas::canvasSizeChanged()
81 {
82 IntSize canvasSize = toHTMLCanvasElement(node())->size();
83 LayoutSize zoomedSize(canvasSize.width() * style()->effectiveZoom(), canvasSize.height() * style()->effectiveZoom());
84
85 if (zoomedSize == intrinsicSize())
86 return;
87
88 setIntrinsicSize(zoomedSize);
89
90 if (!parent())
91 return;
92
93 if (!preferredLogicalWidthsDirty())
94 setPreferredLogicalWidthsDirty();
95
96 LayoutSize oldSize = size();
97 updateLogicalWidth();
98 updateLogicalHeight();
99 if (oldSize == size())
100 return;
101
102 if (!selfNeedsLayout())
103 setNeedsLayoutAndFullPaintInvalidation();
104 }
105
additionalCompositingReasons(CompositingTriggerFlags triggers) const106 CompositingReasons RenderHTMLCanvas::additionalCompositingReasons(CompositingTriggerFlags triggers) const
107 {
108 if (!(triggers & CanvasTrigger))
109 return CompositingReasonNone;
110
111 HTMLCanvasElement* canvas = toHTMLCanvasElement(node());
112 if (canvas->renderingContext() && canvas->renderingContext()->isAccelerated())
113 return CompositingReasonCanvas;
114
115 return CompositingReasonNone;
116 }
117
118 } // namespace WebCore
119