| /* |
| * Copyright (c) 2008, 2009, Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
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| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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| */ |
| |
| #ifndef SKY_ENGINE_PLATFORM_IMAGE_DECODERS_ICO_ICOIMAGEDECODER_H_ |
| #define SKY_ENGINE_PLATFORM_IMAGE_DECODERS_ICO_ICOIMAGEDECODER_H_ |
| |
| #include "platform/image-decoders/bmp/BMPImageReader.h" |
| |
| namespace blink { |
| |
| class PNGImageDecoder; |
| |
| // This class decodes the ICO and CUR image formats. |
| class PLATFORM_EXPORT ICOImageDecoder : public ImageDecoder { |
| public: |
| ICOImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProfileOption, size_t maxDecodedBytes); |
| virtual ~ICOImageDecoder(); |
| |
| // ImageDecoder |
| virtual String filenameExtension() const override { return "ico"; } |
| virtual void setData(SharedBuffer*, bool allDataReceived) override; |
| virtual bool isSizeAvailable() override; |
| virtual IntSize size() const override; |
| virtual IntSize frameSizeAtIndex(size_t) const override; |
| virtual bool setSize(unsigned width, unsigned height) override; |
| virtual size_t frameCount() override; |
| virtual ImageFrame* frameBufferAtIndex(size_t) override; |
| // CAUTION: setFailed() deletes all readers and decoders. Be careful to |
| // avoid accessing deleted memory, especially when calling this from |
| // inside BMPImageReader! |
| virtual bool setFailed() override; |
| virtual bool hotSpot(IntPoint&) const override; |
| |
| private: |
| enum ImageType { |
| Unknown, |
| BMP, |
| PNG, |
| }; |
| |
| enum FileType { |
| ICON = 1, |
| CURSOR = 2, |
| }; |
| |
| struct IconDirectoryEntry { |
| IntSize m_size; |
| uint16_t m_bitCount; |
| IntPoint m_hotSpot; |
| uint32_t m_imageOffset; |
| }; |
| |
| // Returns true if |a| is a preferable icon entry to |b|. |
| // Larger sizes, or greater bitdepths at the same size, are preferable. |
| static bool compareEntries(const IconDirectoryEntry& a, const IconDirectoryEntry& b); |
| |
| inline uint16_t readUint16(int offset) const |
| { |
| return BMPImageReader::readUint16(m_data.get(), m_decodedOffset + offset); |
| } |
| |
| inline uint32_t readUint32(int offset) const |
| { |
| return BMPImageReader::readUint32(m_data.get(), m_decodedOffset + offset); |
| } |
| |
| // If the desired PNGImageDecoder exists, gives it the appropriate data. |
| void setDataForPNGDecoderAtIndex(size_t); |
| |
| // Decodes the entry at |index|. If |onlySize| is true, stops decoding |
| // after calculating the image size. If decoding fails but there is no |
| // more data coming, sets the "decode failure" flag. |
| void decode(size_t index, bool onlySize); |
| |
| // Decodes the directory and directory entries at the beginning of the |
| // data, and initializes members. Returns true if all decoding |
| // succeeded. Once this returns true, all entries' sizes are known. |
| bool decodeDirectory(); |
| |
| // Decodes the specified entry. |
| bool decodeAtIndex(size_t); |
| |
| // Processes the ICONDIR at the beginning of the data. Returns true if |
| // the directory could be decoded. |
| bool processDirectory(); |
| |
| // Processes the ICONDIRENTRY records after the directory. Keeps the |
| // "best" entry as the one we'll decode. Returns true if the entries |
| // could be decoded. |
| bool processDirectoryEntries(); |
| |
| // Stores the hot-spot for |index| in |hotSpot| and returns true, |
| // or returns false if there is none. |
| bool hotSpotAtIndex(size_t index, IntPoint& hotSpot) const; |
| |
| // Reads and returns a directory entry from the current offset into |
| // |data|. |
| IconDirectoryEntry readDirectoryEntry(); |
| |
| // Determines whether the desired entry is a BMP or PNG. Returns true |
| // if the type could be determined. |
| ImageType imageTypeAtIndex(size_t); |
| |
| // An index into |m_data| representing how much we've already decoded. |
| // Note that this only tracks data _this_ class decodes; once the |
| // BMPImageReader takes over this will not be updated further. |
| size_t m_decodedOffset; |
| |
| // Which type of file (ICO/CUR) this is. |
| FileType m_fileType; |
| |
| // The headers for the ICO. |
| typedef Vector<IconDirectoryEntry> IconDirectoryEntries; |
| IconDirectoryEntries m_dirEntries; |
| |
| // The image decoders for the various frames. |
| typedef Vector<OwnPtr<BMPImageReader> > BMPReaders; |
| BMPReaders m_bmpReaders; |
| typedef Vector<OwnPtr<PNGImageDecoder> > PNGDecoders; |
| PNGDecoders m_pngDecoders; |
| |
| // Valid only while a BMPImageReader is decoding, this holds the size |
| // for the particular entry being decoded. |
| IntSize m_frameSize; |
| }; |
| |
| } // namespace blink |
| |
| #endif // SKY_ENGINE_PLATFORM_IMAGE_DECODERS_ICO_ICOIMAGEDECODER_H_ |