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 "NativeImageSkia.h"
37 #include "SharedBuffer.h"
38
39 #include "WebData.h"
40 #include "WebSize.h"
41
42 #include <wtf/OwnPtr.h>
43 #include <wtf/PassRefPtr.h>
44
45 using namespace WebCore;
46
47 namespace WebKit {
48
fromData(const WebData & data,const WebSize & desiredSize)49 WebImage WebImage::fromData(const WebData& data, const WebSize& desiredSize)
50 {
51 ImageSource source;
52 source.setData(PassRefPtr<SharedBuffer>(data).get(), true);
53 if (!source.isSizeAvailable())
54 return WebImage();
55
56 // Frames are arranged by decreasing size, then decreasing bit depth.
57 // Pick the frame closest to |desiredSize|'s area without being smaller,
58 // which has the highest bit depth.
59 const size_t frameCount = source.frameCount();
60 size_t index = 0; // Default to first frame if none are large enough.
61 int frameAreaAtIndex = 0;
62 for (size_t i = 0; i < frameCount; ++i) {
63 const IntSize frameSize = source.frameSizeAtIndex(i);
64 if (WebSize(frameSize) == desiredSize) {
65 index = i;
66 break; // Perfect match.
67 }
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 OwnPtr<NativeImageSkia> frame(source.createFrameAtIndex(index));
80 if (!frame.get())
81 return WebImage();
82
83 return WebImage(*frame);
84 }
85
reset()86 void WebImage::reset()
87 {
88 m_bitmap.reset();
89 }
90
assign(const WebImage & image)91 void WebImage::assign(const WebImage& image)
92 {
93 m_bitmap = image.m_bitmap;
94 }
95
isNull() const96 bool WebImage::isNull() const
97 {
98 return m_bitmap.isNull();
99 }
100
size() const101 WebSize WebImage::size() const
102 {
103 return WebSize(m_bitmap.width(), m_bitmap.height());
104 }
105
WebImage(const PassRefPtr<Image> & image)106 WebImage::WebImage(const PassRefPtr<Image>& image)
107 {
108 operator=(image);
109 }
110
operator =(const PassRefPtr<Image> & image)111 WebImage& WebImage::operator=(const PassRefPtr<Image>& image)
112 {
113 NativeImagePtr p;
114 if (image.get() && (p = image->nativeImageForCurrentFrame()))
115 assign(*p);
116 else
117 reset();
118 return *this;
119 }
120
121 } // namespace WebKit
122