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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 ICOImageDecoder_h |
| 32 #define ICOImageDecoder_h |
| 33 |
| 34 #include "platform/image-decoders/bmp/BMPImageReader.h" |
| 35 |
| 36 namespace WebCore { |
| 37 |
| 38 class PNGImageDecoder; |
| 39 |
| 40 // This class decodes the ICO and CUR image formats. |
| 41 class PLATFORM_EXPORT ICOImageDecoder : public ImageDecoder { |
| 42 public: |
| 43 ICOImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProfileO
ption, size_t maxDecodedBytes); |
| 44 virtual ~ICOImageDecoder(); |
| 45 |
| 46 // ImageDecoder |
| 47 virtual String filenameExtension() const { return "ico"; } |
| 48 virtual void setData(SharedBuffer*, bool allDataReceived); |
| 49 virtual bool isSizeAvailable(); |
| 50 virtual IntSize size() const; |
| 51 virtual IntSize frameSizeAtIndex(size_t) const; |
| 52 virtual bool setSize(unsigned width, unsigned height); |
| 53 virtual size_t frameCount(); |
| 54 virtual ImageFrame* frameBufferAtIndex(size_t); |
| 55 // CAUTION: setFailed() deletes all readers and decoders. Be careful to |
| 56 // avoid accessing deleted memory, especially when calling this from |
| 57 // inside BMPImageReader! |
| 58 virtual bool setFailed(); |
| 59 virtual bool hotSpot(IntPoint&) const; |
| 60 |
| 61 private: |
| 62 enum ImageType { |
| 63 Unknown, |
| 64 BMP, |
| 65 PNG, |
| 66 }; |
| 67 |
| 68 enum FileType { |
| 69 ICON = 1, |
| 70 CURSOR = 2, |
| 71 }; |
| 72 |
| 73 struct IconDirectoryEntry { |
| 74 IntSize m_size; |
| 75 uint16_t m_bitCount; |
| 76 IntPoint m_hotSpot; |
| 77 uint32_t m_imageOffset; |
| 78 }; |
| 79 |
| 80 // Returns true if |a| is a preferable icon entry to |b|. |
| 81 // Larger sizes, or greater bitdepths at the same size, are preferable. |
| 82 static bool compareEntries(const IconDirectoryEntry& a, const IconDirectoryE
ntry& b); |
| 83 |
| 84 inline uint16_t readUint16(int offset) const |
| 85 { |
| 86 return BMPImageReader::readUint16(m_data.get(), m_decodedOffset + offset
); |
| 87 } |
| 88 |
| 89 inline uint32_t readUint32(int offset) const |
| 90 { |
| 91 return BMPImageReader::readUint32(m_data.get(), m_decodedOffset + offset
); |
| 92 } |
| 93 |
| 94 // If the desired PNGImageDecoder exists, gives it the appropriate data. |
| 95 void setDataForPNGDecoderAtIndex(size_t); |
| 96 |
| 97 // Decodes the entry at |index|. If |onlySize| is true, stops decoding |
| 98 // after calculating the image size. If decoding fails but there is no |
| 99 // more data coming, sets the "decode failure" flag. |
| 100 void decode(size_t index, bool onlySize); |
| 101 |
| 102 // Decodes the directory and directory entries at the beginning of the |
| 103 // data, and initializes members. Returns true if all decoding |
| 104 // succeeded. Once this returns true, all entries' sizes are known. |
| 105 bool decodeDirectory(); |
| 106 |
| 107 // Decodes the specified entry. |
| 108 bool decodeAtIndex(size_t); |
| 109 |
| 110 // Processes the ICONDIR at the beginning of the data. Returns true if |
| 111 // the directory could be decoded. |
| 112 bool processDirectory(); |
| 113 |
| 114 // Processes the ICONDIRENTRY records after the directory. Keeps the |
| 115 // "best" entry as the one we'll decode. Returns true if the entries |
| 116 // could be decoded. |
| 117 bool processDirectoryEntries(); |
| 118 |
| 119 // Stores the hot-spot for |index| in |hotSpot| and returns true, |
| 120 // or returns false if there is none. |
| 121 bool hotSpotAtIndex(size_t index, IntPoint& hotSpot) const; |
| 122 |
| 123 // Reads and returns a directory entry from the current offset into |
| 124 // |data|. |
| 125 IconDirectoryEntry readDirectoryEntry(); |
| 126 |
| 127 // Determines whether the desired entry is a BMP or PNG. Returns true |
| 128 // if the type could be determined. |
| 129 ImageType imageTypeAtIndex(size_t); |
| 130 |
| 131 // An index into |m_data| representing how much we've already decoded. |
| 132 // Note that this only tracks data _this_ class decodes; once the |
| 133 // BMPImageReader takes over this will not be updated further. |
| 134 size_t m_decodedOffset; |
| 135 |
| 136 // Which type of file (ICO/CUR) this is. |
| 137 FileType m_fileType; |
| 138 |
| 139 // The headers for the ICO. |
| 140 typedef Vector<IconDirectoryEntry> IconDirectoryEntries; |
| 141 IconDirectoryEntries m_dirEntries; |
| 142 |
| 143 // The image decoders for the various frames. |
| 144 typedef Vector<OwnPtr<BMPImageReader> > BMPReaders; |
| 145 BMPReaders m_bmpReaders; |
| 146 typedef Vector<OwnPtr<PNGImageDecoder> > PNGDecoders; |
| 147 PNGDecoders m_pngDecoders; |
| 148 |
| 149 // Valid only while a BMPImageReader is decoding, this holds the size |
| 150 // for the particular entry being decoded. |
| 151 IntSize m_frameSize; |
| 152 }; |
| 153 |
| 154 } // namespace WebCore |
| 155 |
| 156 #endif |
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