Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 85 insertions, 0 deletions

diff --git a/Source/WebCore/platform/image-decoders/gif/GIFImageDecoder.h b/Source/WebCore/platform/image-decoders/gif/GIFImageDecoder.h
new file mode 100644
index 0000000..64240d4
--- /dev/null
+++ b/Source/WebCore/platform/image-decoders/gif/GIFImageDecoder.h
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2006 Apple Computer, 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:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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 GIFImageDecoder_h
+#define GIFImageDecoder_h
+
+#include "ImageDecoder.h"
+#include <wtf/OwnPtr.h>
+
+struct GIFImageReader;
+
+namespace WebCore {
+
+    // This class decodes the GIF image format.
+    class GIFImageDecoder : public ImageDecoder {
+    public:
+        GIFImageDecoder(ImageSource::AlphaOption, ImageSource::GammaAndColorProfileOption);
+        virtual ~GIFImageDecoder();
+
+        enum GIFQuery { GIFFullQuery, GIFSizeQuery, GIFFrameCountQuery };
+
+        // ImageDecoder
+        virtual String filenameExtension() const { return "gif"; }
+        virtual void setData(SharedBuffer* data, bool allDataReceived);
+        virtual bool isSizeAvailable();
+        virtual bool setSize(int width, int height);
+        virtual size_t frameCount();
+        virtual int repetitionCount() const;
+        virtual RGBA32Buffer* frameBufferAtIndex(size_t index);
+        // CAUTION: setFailed() deletes |m_reader|.  Be careful to avoid
+        // accessing deleted memory, especially when calling this from inside
+        // GIFImageReader!
+        virtual bool setFailed();
+        virtual void clearFrameBufferCache(size_t clearBeforeFrame);
+
+        // Callbacks from the GIF reader.
+        void decodingHalted(unsigned bytesLeft);
+        bool haveDecodedRow(unsigned frameIndex, unsigned char* rowBuffer, unsigned char* rowEnd, unsigned rowNumber, unsigned repeatCount, bool writeTransparentPixels);
+        bool frameComplete(unsigned frameIndex, unsigned frameDuration, RGBA32Buffer::FrameDisposalMethod disposalMethod);
+        void gifComplete();
+
+    private:
+        // If the query is GIFFullQuery, decodes the image up to (but not
+        // including) |haltAtFrame|.  Otherwise, decodes as much as is needed to
+        // answer the query, ignoring bitmap data.  If decoding fails but there
+        // is no more data coming, sets the "decode failure" flag.
+        void decode(unsigned haltAtFrame, GIFQuery);
+
+        // Called to initialize the frame buffer with the given index, based on
+        // the previous frame's disposal method. Returns true on success. On
+        // failure, this will mark the image as failed.
+        bool initFrameBuffer(unsigned frameIndex);
+
+        bool m_alreadyScannedThisDataForFrameCount;
+        bool m_currentBufferSawAlpha;
+        mutable int m_repetitionCount;
+        OwnPtr<GIFImageReader> m_reader;
+        unsigned m_readOffset;
+    };
+
+} // namespace WebCore
+
+#endif