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 "CanvasRenderingContext.h"
30 #include "Document.h"
31 #include "FrameView.h"
32 #include "GraphicsContext.h"
33 #include "HTMLCanvasElement.h"
34 #include "HTMLNames.h"
35 #include "PaintInfo.h"
36 #include "RenderView.h"
37
38 namespace WebCore {
39
40 using namespace HTMLNames;
41
RenderHTMLCanvas(HTMLCanvasElement * element)42 RenderHTMLCanvas::RenderHTMLCanvas(HTMLCanvasElement* element)
43 : RenderReplaced(element, element->size())
44 {
45 view()->frameView()->setIsVisuallyNonEmpty();
46 }
47
requiresLayer() const48 bool RenderHTMLCanvas::requiresLayer() const
49 {
50 #if PLATFORM(ANDROID)
51 // All Canvas are drawn on their own composited layer
52 // This improves performances a lot (as this simplify
53 // the repaint/inval chain dealing with the PictureSet)
54 return true;
55 #endif
56
57 if (RenderReplaced::requiresLayer())
58 return true;
59
60 HTMLCanvasElement* canvas = static_cast<HTMLCanvasElement*>(node());
61 return canvas && canvas->renderingContext() && canvas->renderingContext()->isAccelerated();
62 }
63
paintReplaced(PaintInfo & paintInfo,int tx,int ty)64 void RenderHTMLCanvas::paintReplaced(PaintInfo& paintInfo, int tx, int ty)
65 {
66 IntRect rect = contentBoxRect();
67 rect.move(tx, ty);
68 static_cast<HTMLCanvasElement*>(node())->paint(paintInfo.context, rect);
69 }
70
canvasSizeChanged()71 void RenderHTMLCanvas::canvasSizeChanged()
72 {
73 IntSize canvasSize = static_cast<HTMLCanvasElement*>(node())->size();
74 IntSize zoomedSize(canvasSize.width() * style()->effectiveZoom(), canvasSize.height() * style()->effectiveZoom());
75
76 if (zoomedSize == intrinsicSize())
77 return;
78
79 setIntrinsicSize(zoomedSize);
80
81 if (!parent())
82 return;
83
84 if (!preferredLogicalWidthsDirty())
85 setPreferredLogicalWidthsDirty(true);
86
87 IntSize oldSize = size();
88 computeLogicalWidth();
89 computeLogicalHeight();
90 if (oldSize == size())
91 return;
92
93 if (!selfNeedsLayout())
94 setNeedsLayout(true);
95 }
96
97 } // namespace WebCore
98