Move gif image decoder to SkCodec

third_party/WebKit/Source/platform/image-decoders/gif/GIFImageReader.h

Index: third_party/WebKit/Source/platform/image-decoders/gif/GIFImageReader.h
diff --git a/third_party/WebKit/Source/platform/image-decoders/gif/GIFImageReader.h b/third_party/WebKit/Source/platform/image-decoders/gif/GIFImageReader.h
deleted file mode 100644
index de91c1ac390cae04e0c1ac670a130b5f7eca64b9..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/platform/image-decoders/gif/GIFImageReader.h
+++ /dev/null
@@ -1,363 +0,0 @@
-/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is Mozilla Communicator client code.
- *
- * The Initial Developer of the Original Code is
- * Netscape Communications Corporation.
- * Portions created by the Initial Developer are Copyright (C) 1998
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either the GNU General Public License Version 2 or later (the "GPL"), or
- * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
-
-#ifndef GIFImageReader_h
-#define GIFImageReader_h
-
-// Define ourselves as the clientPtr.  Mozilla just hacked their C++ callback
-// class into this old C decoder, so we will too.
-#include "platform/image-decoders/FastSharedBufferReader.h"
-#include "platform/image-decoders/gif/GIFImageDecoder.h"
-#include "wtf/Allocator.h"
-#include "wtf/Noncopyable.h"
-#include "wtf/Vector.h"
-#include <memory>
-
-#define MAX_DICTIONARY_ENTRY_BITS 12
-#define MAX_DICTIONARY_ENTRIES 4096  // 2^MAX_DICTIONARY_ENTRY_BITS
-#define MAX_COLORS 256
-#define BYTES_PER_COLORMAP_ENTRY 3
-
-const int cLoopCountNotSeen = -2;
-
-// List of possible parsing states.
-enum GIFState {
-  GIFType,
-  GIFGlobalHeader,
-  GIFGlobalColormap,
-  GIFImageStart,
-  GIFImageHeader,
-  GIFImageColormap,
-  GIFImageBody,
-  GIFLZWStart,
-  GIFLZW,
-  GIFSubBlock,
-  GIFExtension,
-  GIFControlExtension,
-  GIFConsumeBlock,
-  GIFSkipBlock,
-  GIFDone,
-  GIFCommentExtension,
-  GIFApplicationExtension,
-  GIFNetscapeExtensionBlock,
-  GIFConsumeNetscapeExtension,
-  GIFConsumeComment
-};
-
-struct GIFFrameContext;
-
-// LZW decoder state machine.
-class GIFLZWContext final {
-  USING_FAST_MALLOC(GIFLZWContext);
-  WTF_MAKE_NONCOPYABLE(GIFLZWContext);
-
- public:
-  GIFLZWContext(blink::GIFImageDecoder* client,
-                const GIFFrameContext* frameContext)
-      : codesize(0),
-        codemask(0),
-        clearCode(0),
-        avail(0),
-        oldcode(0),
-        firstchar(0),
-        bits(0),
-        datum(0),
-        ipass(0),
-        irow(0),
-        rowsRemaining(0),
-        rowIter(0),
-        m_client(client),
-        m_frameContext(frameContext) {}
-
-  bool prepareToDecode();
-  bool outputRow(GIFRow::const_iterator rowBegin);
-  bool doLZW(const unsigned char* block, size_t bytesInBlock);
-  bool hasRemainingRows() { return rowsRemaining; }
-
- private:
-  // LZW decoding states and output states.
-  int codesize;
-  int codemask;
-  int clearCode;  // Codeword used to trigger dictionary reset.
-  int avail;      // Index of next available slot in dictionary.
-  int oldcode;
-  unsigned char firstchar;
-  int bits;              // Number of unread bits in "datum".
-  int datum;             // 32-bit input buffer.
-  int ipass;             // Interlace pass; Ranges 1-4 if interlaced.
-  size_t irow;           // Current output row, starting at zero.
-  size_t rowsRemaining;  // Rows remaining to be output.
-
-  unsigned short prefix[MAX_DICTIONARY_ENTRIES];
-  unsigned char suffix[MAX_DICTIONARY_ENTRIES];
-  unsigned short suffixLength[MAX_DICTIONARY_ENTRIES];
-  GIFRow rowBuffer;  // Single scanline temporary buffer.
-  GIFRow::iterator rowIter;
-
-  // Initialized during construction and read-only.
-  blink::GIFImageDecoder* m_client;
-  const GIFFrameContext* m_frameContext;
-};
-
-// Data structure for one LZW block.
-struct GIFLZWBlock {
-  DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
-
- public:
-  GIFLZWBlock(size_t position, size_t size)
-      : blockPosition(position), blockSize(size) {}
-
-  size_t blockPosition;
-  size_t blockSize;
-};
-
-class GIFColorMap final {
-  DISALLOW_NEW();
-
- public:
-  typedef Vector<blink::ImageFrame::PixelData> Table;
-
-  GIFColorMap() : m_isDefined(false), m_position(0), m_colors(0) {}
-
-  // Set position and number of colors for the RGB table in the data stream.
-  void setTablePositionAndSize(size_t position, size_t colors) {
-    m_position = position;
-    m_colors = colors;
-  }
-  void setDefined() { m_isDefined = true; }
-  bool isDefined() const { return m_isDefined; }
-
-  // Build RGBA table using the data stream.
-  void buildTable(blink::FastSharedBufferReader*);
-  const Table& getTable() const { return m_table; }
-
- private:
-  bool m_isDefined;
-  size_t m_position;
-  size_t m_colors;
-  Table m_table;
-};
-
-// LocalFrame output state machine.
-struct GIFFrameContext {
-  USING_FAST_MALLOC(GIFFrameContext);
-  WTF_MAKE_NONCOPYABLE(GIFFrameContext);
-
- public:
-  GIFFrameContext(int id)
-      : m_frameId(id),
-        m_xOffset(0),
-        m_yOffset(0),
-        m_width(0),
-        m_height(0),
-        m_transparentPixel(kNotFound),
-        m_disposalMethod(blink::ImageFrame::DisposeNotSpecified),
-        m_dataSize(0),
-        m_progressiveDisplay(false),
-        m_interlaced(false),
-        m_delayTime(0),
-        m_currentLzwBlock(0),
-        m_isComplete(false),
-        m_isHeaderDefined(false),
-        m_isDataSizeDefined(false) {}
-
-  ~GIFFrameContext() {}
-
-  void addLzwBlock(size_t position, size_t size) {
-    m_lzwBlocks.push_back(GIFLZWBlock(position, size));
-  }
-
-  bool decode(blink::FastSharedBufferReader*,
-              blink::GIFImageDecoder* client,
-              bool* frameDecoded);
-
-  int frameId() const { return m_frameId; }
-  void setRect(unsigned x, unsigned y, unsigned width, unsigned height) {
-    m_xOffset = x;
-    m_yOffset = y;
-    m_width = width;
-    m_height = height;
-  }
-  blink::IntRect frameRect() const {
-    return blink::IntRect(m_xOffset, m_yOffset, m_width, m_height);
-  }
-  unsigned xOffset() const { return m_xOffset; }
-  unsigned yOffset() const { return m_yOffset; }
-  unsigned width() const { return m_width; }
-  unsigned height() const { return m_height; }
-  size_t transparentPixel() const { return m_transparentPixel; }
-  void setTransparentPixel(size_t pixel) { m_transparentPixel = pixel; }
-  blink::ImageFrame::DisposalMethod getDisposalMethod() const {
-    return m_disposalMethod;
-  }
-  void setDisposalMethod(blink::ImageFrame::DisposalMethod disposalMethod) {
-    m_disposalMethod = disposalMethod;
-  }
-  unsigned delayTime() const { return m_delayTime; }
-  void setDelayTime(unsigned delay) { m_delayTime = delay; }
-  bool isComplete() const { return m_isComplete; }
-  void setComplete() { m_isComplete = true; }
-  bool isHeaderDefined() const { return m_isHeaderDefined; }
-  void setHeaderDefined() { m_isHeaderDefined = true; }
-  bool isDataSizeDefined() const { return m_isDataSizeDefined; }
-  int dataSize() const { return m_dataSize; }
-  void setDataSize(int size) {
-    m_dataSize = size;
-    m_isDataSizeDefined = true;
-  }
-  bool progressiveDisplay() const { return m_progressiveDisplay; }
-  void setProgressiveDisplay(bool progressiveDisplay) {
-    m_progressiveDisplay = progressiveDisplay;
-  }
-  bool interlaced() const { return m_interlaced; }
-  void setInterlaced(bool interlaced) { m_interlaced = interlaced; }
-
-  void clearDecodeState() { m_lzwContext.reset(); }
-  const GIFColorMap& localColorMap() const { return m_localColorMap; }
-  GIFColorMap& localColorMap() { return m_localColorMap; }
-
- private:
-  int m_frameId;
-  unsigned m_xOffset;
-  unsigned m_yOffset;  // With respect to "screen" origin.
-  unsigned m_width;
-  unsigned m_height;
-  size_t m_transparentPixel;  // Index of transparent pixel. Value is kNotFound
-                              // if there is no transparent pixel.
-  blink::ImageFrame::DisposalMethod
-      m_disposalMethod;  // Restore to background, leave in place, etc.
-  int m_dataSize;
-
-  bool m_progressiveDisplay;  // If true, do Haeberli interlace hack.
-  bool m_interlaced;          // True, if scanlines arrive interlaced order.
-
-  unsigned m_delayTime;  // Display time, in milliseconds, for this image in a
-                         // multi-image GIF.
-
-  std::unique_ptr<GIFLZWContext> m_lzwContext;
-  Vector<GIFLZWBlock> m_lzwBlocks;  // LZW blocks for this frame.
-  GIFColorMap m_localColorMap;
-
-  size_t m_currentLzwBlock;
-  bool m_isComplete;
-  bool m_isHeaderDefined;
-  bool m_isDataSizeDefined;
-};
-
-class PLATFORM_EXPORT GIFImageReader final {
-  USING_FAST_MALLOC(GIFImageReader);
-  WTF_MAKE_NONCOPYABLE(GIFImageReader);
-
- public:
-  GIFImageReader(blink::GIFImageDecoder* client = 0)
-      : m_client(client),
-        m_state(GIFType),
-        // Number of bytes for GIF type, either "GIF87a" or "GIF89a".
-        m_bytesToConsume(6),
-        m_bytesRead(0),
-        m_version(0),
-        m_screenWidth(0),
-        m_screenHeight(0),
-        m_sentSizeToClient(false),
-        m_loopCount(cLoopCountNotSeen),
-        m_parseCompleted(false) {}
-
-  ~GIFImageReader() {}
-
-  void setData(PassRefPtr<blink::SegmentReader> data) { m_data = data; }
-  bool parse(blink::GIFImageDecoder::GIFParseQuery);
-  bool decode(size_t frameIndex);
-
-  size_t imagesCount() const {
-    if (m_frames.isEmpty())
-      return 0;
-
-    // This avoids counting an empty frame when the file is truncated right
-    // after GIFControlExtension but before GIFImageHeader.
-    // FIXME: This extra complexity is not necessary and we should just report
-    // m_frames.size().
-    return m_frames.back()->isHeaderDefined() ? m_frames.size()
-                                              : m_frames.size() - 1;
-  }
-  int loopCount() const { return m_loopCount; }
-
-  const GIFColorMap& globalColorMap() const { return m_globalColorMap; }
-
-  const GIFFrameContext* frameContext(size_t index) const {
-    return index < m_frames.size() ? m_frames[index].get() : 0;
-  }
-
-  bool parseCompleted() const { return m_parseCompleted; }
-
-  void clearDecodeState(size_t index) { m_frames[index]->clearDecodeState(); }
-
- private:
-  bool parseData(size_t dataPosition,
-                 size_t len,
-                 blink::GIFImageDecoder::GIFParseQuery);
-  void setRemainingBytes(size_t);
-
-  void addFrameIfNecessary();
-  bool currentFrameIsFirstFrame() const {
-    return m_frames.isEmpty() ||
-           (m_frames.size() == 1u && !m_frames[0]->isComplete());
-  }
-
-  blink::GIFImageDecoder* m_client;
-
-  // Parsing state machine.
-  GIFState m_state;         // Current decoder master state.
-  size_t m_bytesToConsume;  // Number of bytes to consume for next stage of
-                            // parsing.
-  size_t m_bytesRead;       // Number of bytes processed.
-
-  // Global (multi-image) state.
-  int m_version;           // Either 89 for GIF89 or 87 for GIF87.
-  unsigned m_screenWidth;  // Logical screen width & height.
-  unsigned m_screenHeight;
-  bool m_sentSizeToClient;
-  GIFColorMap m_globalColorMap;
-  int m_loopCount;  // Netscape specific extension block to control the number
-                    // of animation loops a GIF renders.
-
-  Vector<std::unique_ptr<GIFFrameContext>> m_frames;
-
-  RefPtr<blink::SegmentReader> m_data;
-  bool m_parseCompleted;
-};
-
-#endif