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/paint/HTMLCanvasPainter.h"
35#include "core/rendering/PaintInfo.h"
36#include "core/rendering/RenderView.h"
37
38namespace blink {
39
40using namespace HTMLNames;
41
42RenderHTMLCanvas::RenderHTMLCanvas(HTMLCanvasElement* element)
43    : RenderReplaced(element, element->size())
44{
45    view()->frameView()->setIsVisuallyNonEmpty();
46}
47
48LayerType RenderHTMLCanvas::layerTypeRequired() const
49{
50    return NormalLayer;
51}
52
53void RenderHTMLCanvas::paintReplaced(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
54{
55    HTMLCanvasPainter(*this).paintReplaced(paintInfo, paintOffset);
56}
57
58void RenderHTMLCanvas::canvasSizeChanged()
59{
60    IntSize canvasSize = toHTMLCanvasElement(node())->size();
61    LayoutSize zoomedSize(canvasSize.width() * style()->effectiveZoom(), canvasSize.height() * style()->effectiveZoom());
62
63    if (zoomedSize == intrinsicSize())
64        return;
65
66    setIntrinsicSize(zoomedSize);
67
68    if (!parent())
69        return;
70
71    if (!preferredLogicalWidthsDirty())
72        setPreferredLogicalWidthsDirty();
73
74    LayoutSize oldSize = size();
75    updateLogicalWidth();
76    updateLogicalHeight();
77    if (oldSize == size())
78        return;
79
80    if (!selfNeedsLayout())
81        setNeedsLayout();
82}
83
84CompositingReasons RenderHTMLCanvas::additionalCompositingReasons() const
85{
86    HTMLCanvasElement* canvas = toHTMLCanvasElement(node());
87    if (canvas->renderingContext() && canvas->renderingContext()->isAccelerated())
88        return CompositingReasonCanvas;
89
90    return CompositingReasonNone;
91}
92
93} // namespace blink
94