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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 #ifndef BMPImageDecoder_h | |
32 #define BMPImageDecoder_h | |
33 | |
34 #include "core/platform/image-decoders/bmp/BMPImageReader.h" | |
35 #include "wtf/OwnPtr.h" | |
36 | |
37 namespace WebCore { | |
38 | |
39 // This class decodes the BMP image format. | |
40 class BMPImageDecoder : public ImageDecoder { | |
41 public: | |
42 BMPImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProf
ileOption, size_t maxDecodedBytes); | |
43 | |
44 // ImageDecoder | |
45 virtual String filenameExtension() const { return "bmp"; } | |
46 virtual void setData(SharedBuffer*, bool allDataReceived); | |
47 virtual bool isSizeAvailable(); | |
48 virtual ImageFrame* frameBufferAtIndex(size_t); | |
49 // CAUTION: setFailed() deletes |m_reader|. Be careful to avoid | |
50 // accessing deleted memory, especially when calling this from inside | |
51 // BMPImageReader! | |
52 virtual bool setFailed(); | |
53 | |
54 private: | |
55 inline uint32_t readUint32(int offset) const | |
56 { | |
57 return BMPImageReader::readUint32(m_data.get(), m_decodedOffset + of
fset); | |
58 } | |
59 | |
60 // Decodes the image. If |onlySize| is true, stops decoding after | |
61 // calculating the image size. If decoding fails but there is no more | |
62 // data coming, sets the "decode failure" flag. | |
63 void decode(bool onlySize); | |
64 | |
65 // Decodes the image. If |onlySize| is true, stops decoding after | |
66 // calculating the image size. Returns whether decoding succeeded. | |
67 bool decodeHelper(bool onlySize); | |
68 | |
69 // Processes the file header at the beginning of the data. Sets | |
70 // |*imgDataOffset| based on the header contents. Returns true if the | |
71 // file header could be decoded. | |
72 bool processFileHeader(size_t* imgDataOffset); | |
73 | |
74 // An index into |m_data| representing how much we've already decoded. | |
75 // Note that this only tracks data _this_ class decodes; once the | |
76 // BMPImageReader takes over this will not be updated further. | |
77 size_t m_decodedOffset; | |
78 | |
79 // The reader used to do most of the BMP decoding. | |
80 OwnPtr<BMPImageReader> m_reader; | |
81 }; | |
82 | |
83 } // namespace WebCore | |
84 | |
85 #endif | |
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