1 /*
2 * Copyright (c) 2008, 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 "platform/image-decoders/bmp/BMPImageDecoder.h"
33
34 #include "platform/PlatformInstrumentation.h"
35 #include "wtf/PassOwnPtr.h"
36
37 namespace blink {
38
39 // Number of bits in .BMP used to store the file header (doesn't match
40 // "sizeof(BMPImageDecoder::BitmapFileHeader)" since we omit some fields and
41 // don't pack).
42 static const size_t sizeOfFileHeader = 14;
43
BMPImageDecoder(ImageSource::AlphaOption alphaOption,ImageSource::GammaAndColorProfileOption gammaAndColorProfileOption,size_t maxDecodedBytes)44 BMPImageDecoder::BMPImageDecoder(ImageSource::AlphaOption alphaOption,
45 ImageSource::GammaAndColorProfileOption gammaAndColorProfileOption,
46 size_t maxDecodedBytes)
47 : ImageDecoder(alphaOption, gammaAndColorProfileOption, maxDecodedBytes)
48 , m_decodedOffset(0)
49 {
50 }
51
setData(SharedBuffer * data,bool allDataReceived)52 void BMPImageDecoder::setData(SharedBuffer* data, bool allDataReceived)
53 {
54 if (failed())
55 return;
56
57 ImageDecoder::setData(data, allDataReceived);
58 if (m_reader)
59 m_reader->setData(data);
60 }
61
isSizeAvailable()62 bool BMPImageDecoder::isSizeAvailable()
63 {
64 if (!ImageDecoder::isSizeAvailable())
65 decode(true);
66
67 return ImageDecoder::isSizeAvailable();
68 }
69
frameBufferAtIndex(size_t index)70 ImageFrame* BMPImageDecoder::frameBufferAtIndex(size_t index)
71 {
72 if (index)
73 return 0;
74
75 if (m_frameBufferCache.isEmpty()) {
76 m_frameBufferCache.resize(1);
77 m_frameBufferCache.first().setPremultiplyAlpha(m_premultiplyAlpha);
78 }
79
80 ImageFrame* buffer = &m_frameBufferCache.first();
81 if (buffer->status() != ImageFrame::FrameComplete) {
82 PlatformInstrumentation::willDecodeImage("BMP");
83 decode(false);
84 PlatformInstrumentation::didDecodeImage();
85 }
86 return buffer;
87 }
88
setFailed()89 bool BMPImageDecoder::setFailed()
90 {
91 m_reader.clear();
92 return ImageDecoder::setFailed();
93 }
94
decode(bool onlySize)95 void BMPImageDecoder::decode(bool onlySize)
96 {
97 if (failed())
98 return;
99
100 // If we couldn't decode the image but we've received all the data, decoding
101 // has failed.
102 if (!decodeHelper(onlySize) && isAllDataReceived())
103 setFailed();
104 // If we're done decoding the image, we don't need the BMPImageReader
105 // anymore. (If we failed, |m_reader| has already been cleared.)
106 else if (!m_frameBufferCache.isEmpty() && (m_frameBufferCache.first().status() == ImageFrame::FrameComplete))
107 m_reader.clear();
108 }
109
decodeHelper(bool onlySize)110 bool BMPImageDecoder::decodeHelper(bool onlySize)
111 {
112 size_t imgDataOffset = 0;
113 if ((m_decodedOffset < sizeOfFileHeader) && !processFileHeader(imgDataOffset))
114 return false;
115
116 if (!m_reader) {
117 m_reader = adoptPtr(new BMPImageReader(this, m_decodedOffset, imgDataOffset, false));
118 m_reader->setData(m_data.get());
119 }
120
121 if (!m_frameBufferCache.isEmpty())
122 m_reader->setBuffer(&m_frameBufferCache.first());
123
124 return m_reader->decodeBMP(onlySize);
125 }
126
processFileHeader(size_t & imgDataOffset)127 bool BMPImageDecoder::processFileHeader(size_t& imgDataOffset)
128 {
129 // Read file header.
130 ASSERT(!m_decodedOffset);
131 if (m_data->size() < sizeOfFileHeader)
132 return false;
133 const uint16_t fileType = (m_data->data()[0] << 8) | static_cast<uint8_t>(m_data->data()[1]);
134 imgDataOffset = readUint32(10);
135 m_decodedOffset = sizeOfFileHeader;
136
137 // See if this is a bitmap filetype we understand.
138 enum {
139 BMAP = 0x424D, // "BM"
140 // The following additional OS/2 2.x header values (see
141 // http://www.fileformat.info/format/os2bmp/egff.htm ) aren't widely
142 // decoded, and are unlikely to be in much use.
143 /*
144 ICON = 0x4943, // "IC"
145 POINTER = 0x5054, // "PT"
146 COLORICON = 0x4349, // "CI"
147 COLORPOINTER = 0x4350, // "CP"
148 BITMAPARRAY = 0x4241, // "BA"
149 */
150 };
151 return (fileType == BMAP) || setFailed();
152 }
153
154 } // namespace blink
155