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 "Document.h"
30#include "GraphicsContext.h"
31#include "HTMLCanvasElement.h"
32#include "HTMLNames.h"
33#include "RenderView.h"
34#include "FrameView.h"
35
36namespace WebCore {
37
38using namespace HTMLNames;
39
40RenderHTMLCanvas::RenderHTMLCanvas(HTMLCanvasElement* element)
41    : RenderReplaced(element, element->size())
42{
43    view()->frameView()->setIsVisuallyNonEmpty();
44}
45
46bool RenderHTMLCanvas::requiresLayer() const
47{
48    if (RenderReplaced::requiresLayer())
49        return true;
50
51#if ENABLE(3D_CANVAS)
52    HTMLCanvasElement* canvas = static_cast<HTMLCanvasElement*>(node());
53    return canvas && canvas->is3D();
54#else
55    return false;
56#endif
57}
58
59void RenderHTMLCanvas::paintReplaced(PaintInfo& paintInfo, int tx, int ty)
60{
61    IntRect rect = contentBoxRect();
62    rect.move(tx, ty);
63    static_cast<HTMLCanvasElement*>(node())->paint(paintInfo.context, rect);
64}
65
66void RenderHTMLCanvas::canvasSizeChanged()
67{
68    IntSize canvasSize = static_cast<HTMLCanvasElement*>(node())->size();
69    IntSize zoomedSize(canvasSize.width() * style()->effectiveZoom(), canvasSize.height() * style()->effectiveZoom());
70
71    if (zoomedSize == intrinsicSize())
72        return;
73
74    setIntrinsicSize(zoomedSize);
75
76    if (!parent())
77        return;
78
79    if (!prefWidthsDirty())
80        setPrefWidthsDirty(true);
81
82    IntSize oldSize = size();
83    calcWidth();
84    calcHeight();
85    if (oldSize == size())
86        return;
87
88    if (!selfNeedsLayout())
89        setNeedsLayout(true);
90}
91
92} // namespace WebCore
93