1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
/*
* Copyright (C) 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "ImageSource.h"
#if PLATFORM(CG)
#include "IntSize.h"
#include "SharedBuffer.h"
#include <ApplicationServices/ApplicationServices.h>
namespace WebCore {
static const CFStringRef kCGImageSourceShouldPreferRGB32 = CFSTR("kCGImageSourceShouldPreferRGB32");
ImageSource::ImageSource()
: m_decoder(0)
{
}
ImageSource::~ImageSource()
{
clear();
}
void ImageSource::clear()
{
if (m_decoder) {
CFRelease(m_decoder);
m_decoder = 0;
}
}
CFDictionaryRef imageSourceOptions()
{
static CFDictionaryRef options;
if (!options) {
const void* keys[2] = { kCGImageSourceShouldCache, kCGImageSourceShouldPreferRGB32 };
const void* values[2] = { kCFBooleanTrue, kCFBooleanTrue };
options = CFDictionaryCreate(NULL, keys, values, 2,
&kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
}
return options;
}
bool ImageSource::initialized() const
{
return m_decoder;
}
void ImageSource::setData(SharedBuffer* data, bool allDataReceived)
{
if (!m_decoder)
m_decoder = CGImageSourceCreateIncremental(NULL);
#if PLATFORM(MAC)
// On Mac the NSData inside the SharedBuffer can be secretly appended to without the SharedBuffer's knowledge. We use SharedBuffer's ability
// to wrap itself inside CFData to get around this, ensuring that ImageIO is really looking at the SharedBuffer.
CFDataRef cfData = data->createCFData();
#else
// If no NSData is available, then we know SharedBuffer will always just be a vector. That means no secret changes can occur to it behind the
// scenes. We use CFDataCreateWithBytesNoCopy in that case.
CFDataRef cfData = CFDataCreateWithBytesNoCopy(0, reinterpret_cast<const UInt8*>(data->data()), data->size(), kCFAllocatorNull);
#endif
CGImageSourceUpdateData(m_decoder, cfData, allDataReceived);
CFRelease(cfData);
}
bool ImageSource::isSizeAvailable()
{
bool result = false;
CGImageSourceStatus imageSourceStatus = CGImageSourceGetStatus(m_decoder);
// Ragnaros yells: TOO SOON! You have awakened me TOO SOON, Executus!
if (imageSourceStatus >= kCGImageStatusIncomplete) {
CFDictionaryRef image0Properties = CGImageSourceCopyPropertiesAtIndex(m_decoder, 0, imageSourceOptions());
if (image0Properties) {
CFNumberRef widthNumber = (CFNumberRef)CFDictionaryGetValue(image0Properties, kCGImagePropertyPixelWidth);
CFNumberRef heightNumber = (CFNumberRef)CFDictionaryGetValue(image0Properties, kCGImagePropertyPixelHeight);
result = widthNumber && heightNumber;
CFRelease(image0Properties);
}
}
return result;
}
IntSize ImageSource::frameSizeAtIndex(size_t index) const
{
IntSize result;
CFDictionaryRef properties = CGImageSourceCopyPropertiesAtIndex(m_decoder, index, imageSourceOptions());
if (properties) {
int w = 0, h = 0;
CFNumberRef num = (CFNumberRef)CFDictionaryGetValue(properties, kCGImagePropertyPixelWidth);
if (num)
CFNumberGetValue(num, kCFNumberIntType, &w);
num = (CFNumberRef)CFDictionaryGetValue(properties, kCGImagePropertyPixelHeight);
if (num)
CFNumberGetValue(num, kCFNumberIntType, &h);
result = IntSize(w, h);
CFRelease(properties);
}
return result;
}
IntSize ImageSource::size() const
{
return frameSizeAtIndex(0);
}
int ImageSource::repetitionCount()
{
int result = cAnimationLoopOnce; // No property means loop once.
if (!initialized())
return result;
// A property with value 0 means loop forever.
CFDictionaryRef properties = CGImageSourceCopyProperties(m_decoder, imageSourceOptions());
if (properties) {
CFDictionaryRef gifProperties = (CFDictionaryRef)CFDictionaryGetValue(properties, kCGImagePropertyGIFDictionary);
if (gifProperties) {
CFNumberRef num = (CFNumberRef)CFDictionaryGetValue(gifProperties, kCGImagePropertyGIFLoopCount);
if (num)
CFNumberGetValue(num, kCFNumberIntType, &result);
} else
result = cAnimationNone; // Turns out we're not a GIF after all, so we don't animate.
CFRelease(properties);
}
return result;
}
size_t ImageSource::frameCount() const
{
return m_decoder ? CGImageSourceGetCount(m_decoder) : 0;
}
CGImageRef ImageSource::createFrameAtIndex(size_t index)
{
if (!initialized())
return 0;
CGImageRef image = CGImageSourceCreateImageAtIndex(m_decoder, index, imageSourceOptions());
CFStringRef imageUTI = CGImageSourceGetType(m_decoder);
static const CFStringRef xbmUTI = CFSTR("public.xbitmap-image");
if (!imageUTI || !CFEqual(imageUTI, xbmUTI))
return image;
// If it is an xbm image, mask out all the white areas to render them transparent.
const CGFloat maskingColors[6] = {255, 255, 255, 255, 255, 255};
CGImageRef maskedImage = CGImageCreateWithMaskingColors(image, maskingColors);
if (!maskedImage)
return image;
CGImageRelease(image);
return maskedImage;
}
bool ImageSource::frameIsCompleteAtIndex(size_t index)
{
return CGImageSourceGetStatusAtIndex(m_decoder, index) == kCGImageStatusComplete;
}
float ImageSource::frameDurationAtIndex(size_t index)
{
if (!initialized())
return 0;
float duration = 0;
CFDictionaryRef properties = CGImageSourceCopyPropertiesAtIndex(m_decoder, index, imageSourceOptions());
if (properties) {
CFDictionaryRef typeProperties = (CFDictionaryRef)CFDictionaryGetValue(properties, kCGImagePropertyGIFDictionary);
if (typeProperties) {
CFNumberRef num = (CFNumberRef)CFDictionaryGetValue(typeProperties, kCGImagePropertyGIFDelayTime);
if (num)
CFNumberGetValue(num, kCFNumberFloatType, &duration);
}
CFRelease(properties);
}
// Many annoying ads specify a 0 duration to make an image flash as quickly as possible.
// We follow WinIE's behavior and use a duration of 100 ms for any frames that specify
// a duration of <= 50 ms. See <http://bugs.webkit.org/show_bug.cgi?id=14413> or Radar 4051389 for more.
if (duration < 0.051f)
return 0.100f;
return duration;
}
bool ImageSource::frameHasAlphaAtIndex(size_t index)
{
// Might be interesting to do this optimization on Mac some day, but for now we're just using this
// for the Cairo source, since it uses our decoders, and our decoders can answer this question.
// FIXME: Could return false for JPEG and other non-transparent image formats.
// FIXME: Could maybe return false for a GIF Frame if we have enough info in the GIF properties dictionary
// to determine whether or not a transparent color was defined.
return true;
}
}
#endif // PLATFORM(CG)
|
