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 "CSSImageGeneratorValue.h"
28
29#include "Image.h"
30#include "IntSize.h"
31#include "IntSizeHash.h"
32#include "PlatformString.h"
33#include "RenderObject.h"
34#include "StyleGeneratedImage.h"
35
36namespace WebCore {
37
38CSSImageGeneratorValue::CSSImageGeneratorValue()
39: m_accessedImage(false)
40{
41}
42
43CSSImageGeneratorValue::~CSSImageGeneratorValue()
44{
45}
46
47void CSSImageGeneratorValue::addClient(RenderObject* renderer, const IntSize& size)
48{
49    ref();
50    if (!size.isEmpty())
51        m_sizes.add(size);
52
53    RenderObjectSizeCountMap::iterator it = m_clients.find(renderer);
54    if (it == m_clients.end())
55        m_clients.add(renderer, SizeCountPair(size, 1));
56    else {
57        SizeCountPair& sizeCount = it->second;
58        ++sizeCount.second;
59    }
60}
61
62void CSSImageGeneratorValue::removeClient(RenderObject* renderer)
63{
64    RenderObjectSizeCountMap::iterator it = m_clients.find(renderer);
65    ASSERT(it != m_clients.end());
66
67    SizeCountPair& sizeCount = it->second;
68    IntSize size = sizeCount.first;
69    if (!size.isEmpty()) {
70        m_sizes.remove(size);
71        if (!m_sizes.contains(size))
72            m_images.remove(size);
73    }
74
75    if (!--sizeCount.second)
76        m_clients.remove(renderer);
77
78    deref();
79}
80
81Image* CSSImageGeneratorValue::getImage(RenderObject* renderer, const IntSize& size)
82{
83    RenderObjectSizeCountMap::iterator it = m_clients.find(renderer);
84    ASSERT(it != m_clients.end());
85
86    SizeCountPair& sizeCount = it->second;
87    IntSize oldSize = sizeCount.first;
88    if (oldSize != size) {
89        // If renderer is the only client, make sure we don't delete this.
90        RefPtr<CSSImageGeneratorValue> protect(this);
91        removeClient(renderer);
92        addClient(renderer, size);
93    }
94
95    // Don't generate an image for empty sizes.
96    if (size.isEmpty())
97        return 0;
98
99    // Look up the image in our cache.
100    return m_images.get(size).get();
101}
102
103void CSSImageGeneratorValue::putImage(const IntSize& size, PassRefPtr<Image> image)
104{
105    m_images.add(size, image);
106}
107
108StyleGeneratedImage* CSSImageGeneratorValue::generatedImage()
109{
110    if (!m_accessedImage) {
111        m_accessedImage = true;
112        m_image = StyleGeneratedImage::create(this, isFixedSize());
113    }
114    return m_image.get();
115}
116
117} // namespace WebCore
118