1 /*
2 * Copyright (C) 2009 Google 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 are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "config.h"
32 #include "WebImage.h"
33
34 #include "Image.h"
35 #include "ImageSource.h"
36 #include "SharedBuffer.h"
37
38 #include "WebData.h"
39 #include "WebSize.h"
40
41 #include <CoreGraphics/CGImage.h>
42
43 #include <wtf/PassRefPtr.h>
44 #include <wtf/RetainPtr.h>
45
46 using namespace WebCore;
47
48 namespace WebKit {
49
fromData(const WebData & data,const WebSize & desiredSize)50 WebImage WebImage::fromData(const WebData& data, const WebSize& desiredSize)
51 {
52 ImageSource source;
53 source.setData(PassRefPtr<SharedBuffer>(data).get(), true);
54 if (!source.isSizeAvailable())
55 return WebImage();
56
57 // Frames are arranged by decreasing size, then decreasing bit depth.
58 // Pick the frame closest to |desiredSize|'s area without being smaller,
59 // which has the highest bit depth.
60 const size_t frameCount = source.frameCount();
61 size_t index = 0; // Default to first frame if none are large enough.
62 int frameAreaAtIndex = 0;
63 for (size_t i = 0; i < frameCount; ++i) {
64 const IntSize frameSize = source.frameSizeAtIndex(i);
65 if (WebSize(frameSize) == desiredSize) {
66 index = i;
67 break; // Perfect match.
68 }
69 const int frameArea = frameSize.width() * frameSize.height();
70 if (frameArea < (desiredSize.width * desiredSize.height))
71 break; // No more frames that are large enough.
72
73 if (!i || (frameArea < frameAreaAtIndex)) {
74 index = i; // Closer to desired area than previous best match.
75 frameAreaAtIndex = frameArea;
76 }
77 }
78
79 RetainPtr<CGImageRef> frame(AdoptCF, source.createFrameAtIndex(index));
80 if (!frame)
81 return WebImage();
82
83 return WebImage(frame.get());
84 }
85
reset()86 void WebImage::reset()
87 {
88 CGImageRelease(m_imageRef);
89 m_imageRef = 0;
90 }
91
assign(const WebImage & image)92 void WebImage::assign(const WebImage& image)
93 {
94 assign(image.m_imageRef);
95 }
96
isNull() const97 bool WebImage::isNull() const
98 {
99 return !m_imageRef;
100 }
101
size() const102 WebSize WebImage::size() const
103 {
104 return WebSize(CGImageGetWidth(m_imageRef), CGImageGetHeight(m_imageRef));
105 }
106
WebImage(const PassRefPtr<Image> & image)107 WebImage::WebImage(const PassRefPtr<Image>& image)
108 : m_imageRef(0)
109 {
110 NativeImagePtr p;
111 if (image.get() && (p = image->nativeImageForCurrentFrame()))
112 assign(p);
113 }
114
operator =(const PassRefPtr<Image> & image)115 WebImage& WebImage::operator=(const PassRefPtr<Image>& image)
116 {
117 NativeImagePtr p;
118 if (image.get() && (p = image->nativeImageForCurrentFrame()))
119 assign(p);
120 else
121 reset();
122 return *this;
123 }
124
assign(CGImageRef imageRef)125 void WebImage::assign(CGImageRef imageRef)
126 {
127 // Make sure to retain the imageRef first incase m_imageRef == imageRef.
128 CGImageRetain(imageRef);
129 CGImageRelease(m_imageRef);
130 m_imageRef = imageRef;
131 }
132
133 } // namespace WebKit
134