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
38namespace WebCore {
39
40using namespace HTMLNames;
41
42RenderHTMLCanvas::RenderHTMLCanvas(HTMLCanvasElement* element)
43    : RenderReplaced(element, element->size())
44{
45    view()->frameView()->setIsVisuallyNonEmpty();
46}
47
48bool 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
64void 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
71void 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