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/page/Frame.h"
32#include "core/page/FrameView.h"
33#include "core/page/Page.h"
34#include "core/rendering/PaintInfo.h"
35#include "core/rendering/RenderView.h"
36
37namespace WebCore {
38
39using namespace HTMLNames;
40
41RenderHTMLCanvas::RenderHTMLCanvas(HTMLCanvasElement* element)
42    : RenderReplaced(element, element->size())
43{
44    view()->frameView()->setIsVisuallyNonEmpty();
45}
46
47bool RenderHTMLCanvas::requiresLayer() const
48{
49    if (RenderReplaced::requiresLayer())
50        return true;
51
52    HTMLCanvasElement* canvas = toHTMLCanvasElement(node());
53    return canvas && canvas->renderingContext() && canvas->renderingContext()->isAccelerated();
54}
55
56void RenderHTMLCanvas::paintReplaced(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
57{
58    LayoutRect rect = contentBoxRect();
59    rect.moveBy(paintOffset);
60
61    if (Frame* frame = this->frame()) {
62        if (Page* page = frame->page()) {
63            if (paintInfo.phase == PaintPhaseForeground)
64                page->addRelevantRepaintedObject(this, rect);
65        }
66    }
67
68    bool useLowQualityScale = style()->imageRendering() == ImageRenderingOptimizeContrast;
69    toHTMLCanvasElement(node())->paint(paintInfo.context, rect, useLowQualityScale);
70}
71
72void RenderHTMLCanvas::canvasSizeChanged()
73{
74    IntSize canvasSize = toHTMLCanvasElement(node())->size();
75    LayoutSize zoomedSize(canvasSize.width() * style()->effectiveZoom(), canvasSize.height() * style()->effectiveZoom());
76
77    if (zoomedSize == intrinsicSize())
78        return;
79
80    setIntrinsicSize(zoomedSize);
81
82    if (!parent())
83        return;
84
85    if (!preferredLogicalWidthsDirty())
86        setPreferredLogicalWidthsDirty(true);
87
88    LayoutSize oldSize = size();
89    updateLogicalWidth();
90    updateLogicalHeight();
91    if (oldSize == size())
92        return;
93
94    if (!selfNeedsLayout())
95        setNeedsLayout();
96}
97
98} // namespace WebCore
99