1/*
2 * Copyright (C) 2008 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/css/CSSCanvasValue.h"
28
29#include "core/rendering/RenderObject.h"
30#include "wtf/text/StringBuilder.h"
31
32namespace blink {
33
34CSSCanvasValue::~CSSCanvasValue()
35{
36#if !ENABLE(OILPAN)
37    if (m_element)
38        m_element->removeObserver(m_canvasObserver.get());
39#endif
40}
41
42String CSSCanvasValue::customCSSText() const
43{
44    StringBuilder result;
45    result.appendLiteral("-webkit-canvas(");
46    result.append(m_name);
47    result.append(')');
48    return result.toString();
49}
50
51void CSSCanvasValue::canvasChanged(HTMLCanvasElement*, const FloatRect& changedRect)
52{
53    IntRect imageChangeRect = enclosingIntRect(changedRect);
54    RenderObjectSizeCountMap::const_iterator end = clients().end();
55    for (RenderObjectSizeCountMap::const_iterator curr = clients().begin(); curr != end; ++curr)
56        const_cast<RenderObject*>(curr->key)->imageChanged(static_cast<WrappedImagePtr>(this), &imageChangeRect);
57}
58
59void CSSCanvasValue::canvasResized(HTMLCanvasElement*)
60{
61    RenderObjectSizeCountMap::const_iterator end = clients().end();
62    for (RenderObjectSizeCountMap::const_iterator curr = clients().begin(); curr != end; ++curr)
63        const_cast<RenderObject*>(curr->key)->imageChanged(static_cast<WrappedImagePtr>(this));
64}
65
66#if !ENABLE(OILPAN)
67void CSSCanvasValue::canvasDestroyed(HTMLCanvasElement* element)
68{
69    ASSERT_UNUSED(element, element == m_element);
70    m_element = nullptr;
71}
72#endif
73
74IntSize CSSCanvasValue::fixedSize(const RenderObject* renderer)
75{
76    if (HTMLCanvasElement* elt = element(&renderer->document()))
77        return IntSize(elt->width(), elt->height());
78    return IntSize();
79}
80
81HTMLCanvasElement* CSSCanvasValue::element(Document* document)
82{
83     if (!m_element) {
84        m_element = &document->getCSSCanvasElement(m_name);
85        m_element->addObserver(m_canvasObserver.get());
86    }
87    return m_element;
88}
89
90PassRefPtr<Image> CSSCanvasValue::image(RenderObject* renderer, const IntSize& /*size*/)
91{
92    ASSERT(clients().contains(renderer));
93    HTMLCanvasElement* elt = element(&renderer->document());
94    if (!elt || !elt->buffer())
95        return nullptr;
96    return elt->copiedImage();
97}
98
99bool CSSCanvasValue::equals(const CSSCanvasValue& other) const
100{
101    return m_name == other.m_name;
102}
103
104void CSSCanvasValue::traceAfterDispatch(Visitor* visitor)
105{
106    visitor->trace(m_canvasObserver);
107    visitor->trace(m_element);
108    CSSImageGeneratorValue::traceAfterDispatch(visitor);
109}
110
111} // namespace blink
112