1/*
2 * Copyright (C) 2008, 2011, 2012, 2013 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 "CSSCanvasValue.h"
30#include "CSSCrossfadeValue.h"
31#include "CSSGradientValue.h"
32#include "Image.h"
33#include "RenderObject.h"
34#include <wtf/text/WTFString.h>
35
36namespace WebCore {
37
38static const double timeToKeepCachedGeneratedImagesInSeconds = 3;
39
40CSSImageGeneratorValue::CSSImageGeneratorValue(ClassType classType)
41    : CSSValue(classType)
42{
43}
44
45CSSImageGeneratorValue::~CSSImageGeneratorValue()
46{
47}
48
49void CSSImageGeneratorValue::addClient(RenderObject* renderer)
50{
51    ASSERT(renderer);
52    ref();
53    m_clients.add(renderer);
54}
55
56void CSSImageGeneratorValue::removeClient(RenderObject* renderer)
57{
58    ASSERT(renderer);
59    m_clients.remove(renderer);
60    deref();
61}
62
63GeneratorGeneratedImage* CSSImageGeneratorValue::cachedImageForSize(IntSize size)
64{
65    if (size.isEmpty())
66        return 0;
67
68    CachedGeneratedImage* cachedGeneratedImage = m_images.get(size);
69    if (!cachedGeneratedImage)
70        return 0;
71
72    cachedGeneratedImage->puntEvictionTimer();
73    return cachedGeneratedImage->image();
74}
75
76void CSSImageGeneratorValue::saveCachedImageForSize(IntSize size, PassRefPtr<GeneratorGeneratedImage> image)
77{
78    ASSERT(!m_images.contains(size));
79    m_images.add(size, adoptPtr(new CachedGeneratedImage(*this, size, image)));
80}
81
82void CSSImageGeneratorValue::evictCachedGeneratedImage(IntSize size)
83{
84    ASSERT(m_images.contains(size));
85    m_images.remove(size);
86}
87
88CSSImageGeneratorValue::CachedGeneratedImage::CachedGeneratedImage(CSSImageGeneratorValue& owner, IntSize size, PassRefPtr<GeneratorGeneratedImage> image)
89    : m_owner(owner)
90    , m_size(size)
91    , m_image(image)
92    , m_evictionTimer(this, &CSSImageGeneratorValue::CachedGeneratedImage::evictionTimerFired, timeToKeepCachedGeneratedImagesInSeconds)
93{
94    m_evictionTimer.restart();
95}
96
97void CSSImageGeneratorValue::CachedGeneratedImage::evictionTimerFired(DeferrableOneShotTimer<CachedGeneratedImage>*)
98{
99    // NOTE: This is essentially a "delete this", the object is no longer valid after this line.
100    m_owner.evictCachedGeneratedImage(m_size);
101}
102
103PassRefPtr<Image> CSSImageGeneratorValue::image(RenderObject* renderer, const IntSize& size)
104{
105    switch (classType()) {
106    case CanvasClass:
107        return static_cast<CSSCanvasValue*>(this)->image(renderer, size);
108    case CrossfadeClass:
109        return static_cast<CSSCrossfadeValue*>(this)->image(renderer, size);
110    case LinearGradientClass:
111        return static_cast<CSSLinearGradientValue*>(this)->image(renderer, size);
112    case RadialGradientClass:
113        return static_cast<CSSRadialGradientValue*>(this)->image(renderer, size);
114    default:
115        ASSERT_NOT_REACHED();
116    }
117    return 0;
118}
119
120bool CSSImageGeneratorValue::isFixedSize() const
121{
122    switch (classType()) {
123    case CanvasClass:
124        return static_cast<const CSSCanvasValue*>(this)->isFixedSize();
125    case CrossfadeClass:
126        return static_cast<const CSSCrossfadeValue*>(this)->isFixedSize();
127    case LinearGradientClass:
128        return static_cast<const CSSLinearGradientValue*>(this)->isFixedSize();
129    case RadialGradientClass:
130        return static_cast<const CSSRadialGradientValue*>(this)->isFixedSize();
131    default:
132        ASSERT_NOT_REACHED();
133    }
134    return false;
135}
136
137IntSize CSSImageGeneratorValue::fixedSize(const RenderObject* renderer)
138{
139    switch (classType()) {
140    case CanvasClass:
141        return static_cast<CSSCanvasValue*>(this)->fixedSize(renderer);
142    case CrossfadeClass:
143        return static_cast<CSSCrossfadeValue*>(this)->fixedSize(renderer);
144    case LinearGradientClass:
145        return static_cast<CSSLinearGradientValue*>(this)->fixedSize(renderer);
146    case RadialGradientClass:
147        return static_cast<CSSRadialGradientValue*>(this)->fixedSize(renderer);
148    default:
149        ASSERT_NOT_REACHED();
150    }
151    return IntSize();
152}
153
154bool CSSImageGeneratorValue::isPending() const
155{
156    switch (classType()) {
157    case CrossfadeClass:
158        return static_cast<const CSSCrossfadeValue*>(this)->isPending();
159    case CanvasClass:
160        return static_cast<const CSSCanvasValue*>(this)->isPending();
161    case LinearGradientClass:
162        return static_cast<const CSSLinearGradientValue*>(this)->isPending();
163    case RadialGradientClass:
164        return static_cast<const CSSRadialGradientValue*>(this)->isPending();
165    default:
166        ASSERT_NOT_REACHED();
167    }
168    return false;
169}
170
171bool CSSImageGeneratorValue::knownToBeOpaque(const RenderObject* renderer) const
172{
173    switch (classType()) {
174    case CrossfadeClass:
175        return static_cast<const CSSCrossfadeValue*>(this)->knownToBeOpaque(renderer);
176    case CanvasClass:
177        return false;
178    case LinearGradientClass:
179        return static_cast<const CSSLinearGradientValue*>(this)->knownToBeOpaque(renderer);
180    case RadialGradientClass:
181        return static_cast<const CSSRadialGradientValue*>(this)->knownToBeOpaque(renderer);
182    default:
183        ASSERT_NOT_REACHED();
184    }
185    return false;
186}
187
188void CSSImageGeneratorValue::loadSubimages(CachedResourceLoader* cachedResourceLoader)
189{
190    switch (classType()) {
191    case CrossfadeClass:
192        static_cast<CSSCrossfadeValue*>(this)->loadSubimages(cachedResourceLoader);
193        break;
194    case CanvasClass:
195        static_cast<CSSCanvasValue*>(this)->loadSubimages(cachedResourceLoader);
196        break;
197    case LinearGradientClass:
198        static_cast<CSSLinearGradientValue*>(this)->loadSubimages(cachedResourceLoader);
199        break;
200    case RadialGradientClass:
201        static_cast<CSSRadialGradientValue*>(this)->loadSubimages(cachedResourceLoader);
202        break;
203    default:
204        ASSERT_NOT_REACHED();
205    }
206}
207
208} // namespace WebCore
209