Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/image-decoders/ico/ICOImageDecoder.h

-/*
- * 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:
- *
- *     * Redistributions of source code must retain the above copyright
- * 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
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef ICOImageDecoder_h
-#define ICOImageDecoder_h
-
-#include "core/platform/image-decoders/bmp/BMPImageReader.h"
-
-namespace WebCore {
-
-    class PNGImageDecoder;
-
-    // This class decodes the ICO and CUR image formats.
-    class ICOImageDecoder : public ImageDecoder {
-    public:
-        ICOImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProfileOption, size_t maxDecodedBytes);
-        virtual ~ICOImageDecoder();
-
-        // ImageDecoder
-        virtual String filenameExtension() const { return "ico"; }
-        virtual void setData(SharedBuffer*, bool allDataReceived);
-        virtual bool isSizeAvailable();
-        virtual IntSize size() const;
-        virtual IntSize frameSizeAtIndex(size_t) const;
-        virtual bool setSize(unsigned width, unsigned height);
-        virtual size_t frameCount();
-        virtual ImageFrame* frameBufferAtIndex(size_t);
-        // CAUTION: setFailed() deletes all readers and decoders.  Be careful to
-        // avoid accessing deleted memory, especially when calling this from
-        // inside BMPImageReader!
-        virtual bool setFailed();
-        virtual bool hotSpot(IntPoint&) const;
-
-    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 WebCore
-
-#endif