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
36 namespace WebCore {
37
CSSImageGeneratorValue()38 CSSImageGeneratorValue::CSSImageGeneratorValue()
39 : m_accessedImage(false)
40 {
41 }
42
~CSSImageGeneratorValue()43 CSSImageGeneratorValue::~CSSImageGeneratorValue()
44 {
45 }
46
addClient(RenderObject * renderer,const IntSize & size)47 void 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
removeClient(RenderObject * renderer)62 void 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
getImage(RenderObject * renderer,const IntSize & size)81 Image* 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
putImage(const IntSize & size,PassRefPtr<Image> image)103 void CSSImageGeneratorValue::putImage(const IntSize& size, PassRefPtr<Image> image)
104 {
105 m_images.add(size, image);
106 }
107
generatedImage()108 StyleGeneratedImage* 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