[WIP] Move ImageDecoders to SkCodec

third_party/WebKit/Source/platform/image-decoders/png/PNGImageReader.h

-/*
- * 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 PNGImageReader_h
-#define PNGImageReader_h
-
-#include "platform/PlatformExport.h"
-#include "platform/geometry/IntRect.h"
-#include "platform/image-decoders/ImageFrame.h"
-#include "platform/wtf/Allocator.h"
-#include "platform/wtf/PtrUtil.h"
-#include "platform/wtf/Vector.h"
-#include "png.h"
-
-#if !defined(PNG_LIBPNG_VER_MAJOR) || !defined(PNG_LIBPNG_VER_MINOR)
-#error version error: compile against a versioned libpng.
-#endif
-
-#if PNG_LIBPNG_VER_MAJOR > 1 || \
-    (PNG_LIBPNG_VER_MAJOR == 1 && PNG_LIBPNG_VER_MINOR >= 4)
-#define JMPBUF(png_ptr) png_jmpbuf(png_ptr)
-#else
-#define JMPBUF(png_ptr) png_ptr->jmpbuf
-#endif
-
-namespace blink {
-
-class FastSharedBufferReader;
-class PNGImageDecoder;
-class SegmentReader;
-
-class PLATFORM_EXPORT PNGImageReader final {
-  USING_FAST_MALLOC(PNGImageReader);
-  WTF_MAKE_NONCOPYABLE(PNGImageReader);
-
- public:
-  PNGImageReader(PNGImageDecoder*, size_t initial_offset);
-  ~PNGImageReader();
-
-  struct FrameInfo {
-    // The offset where the frame data of this frame starts.
-    size_t start_offset;
-    // The number of bytes that contain frame data, starting at start_offset.
-    size_t byte_length;
-    size_t duration;
-    IntRect frame_rect;
-    ImageFrame::DisposalMethod disposal_method;
-    ImageFrame::AlphaBlendSource alpha_blend;
-  };
-
-  enum class ParseQuery { kSize, kMetaData };
-
-  bool Parse(SegmentReader&, ParseQuery);
-
-  // Returns false on a fatal error.
-  bool Decode(SegmentReader&, size_t);
-  const FrameInfo& GetFrameInfo(size_t) const;
-
-  // Number of complete frames parsed so far; includes frame 0 even if partial.
-  size_t FrameCount() const { return frame_info_.size(); }
-
-  bool ParseCompleted() const { return parse_completed_; };
-
-  bool FrameIsReceivedAtIndex(size_t index) const {
-    if (!index)
-      return FirstFrameFullyReceived();
-    return index < FrameCount();
-  }
-
-  void ClearDecodeState(size_t);
-
-  png_structp PngPtr() const { return png_; }
-  png_infop InfoPtr() const { return info_; }
-
-  png_bytep InterlaceBuffer() const { return interlace_buffer_.get(); }
-  void CreateInterlaceBuffer(int size) {
-    interlace_buffer_ = WrapArrayUnique(new png_byte[size]);
-  }
-  void ClearInterlaceBuffer() { interlace_buffer_.reset(); }
-
- private:
-  png_structp png_;
-  png_infop info_;
-  png_uint_32 width_;
-  png_uint_32 height_;
-
-  PNGImageDecoder* decoder_;
-
-  // The offset in the stream where the PNG image starts.
-  const size_t initial_offset_;
-  // How many bytes have been read during parsing.
-  size_t read_offset_;
-  size_t progressive_decode_offset_;
-  size_t idat_offset_;
-
-  bool idat_is_part_of_animation_;
-  // All IDAT chunks must precede the first fdAT chunk, and all fdAT chunks
-  // should be separated from the IDAT chunks by an fcTL chunk. So this is true
-  // until the first fcTL chunk after an IDAT chunk. After that, only fdAT
-  // chunks are expected.
-  bool expect_idats_;
-  bool is_animated_;
-  bool parsed_signature_;
-  bool parsed_ihdr_;
-  bool parse_completed_;
-  uint32_t reported_frame_count_;
-  uint32_t next_sequence_number_;
-  // True when an fcTL has been parsed but not its corresponding fdAT or IDAT
-  // chunk. Consecutive fcTLs is an error.
-  bool fctl_needs_dat_chunk_;
-  bool ignore_animation_;
-
-  std::unique_ptr<png_byte[]> interlace_buffer_;
-
-  // Value used for the byte_length of a FrameInfo struct to indicate that it is
-  // the first frame and its byte_length is not yet known. 1 is a safe value
-  // since the byte_length field of a frame is at least 12.
-  static constexpr size_t kFirstFrameIndicator = 1;
-
-  // Stores information about a frame until it can be pushed to |frame_info|
-  // once all the frame data has been read from the stream.
-  FrameInfo new_frame_;
-  Vector<FrameInfo, 1> frame_info_;
-
-  size_t ProcessData(const FastSharedBufferReader&,
-                     size_t offset,
-                     size_t length);
-  // Returns false on a fatal error.
-  bool ParseSize(const FastSharedBufferReader&);
-  // Returns false on an error.
-  bool ParseFrameInfo(const png_byte* data);
-  bool ShouldDecodeWithNewPNG(size_t) const;
-  void StartFrameDecoding(const FastSharedBufferReader&, size_t);
-  // Returns whether the frame was completely decoded.
-  bool ProgressivelyDecodeFirstFrame(const FastSharedBufferReader&);
-  void DecodeFrame(const FastSharedBufferReader&, size_t);
-  void ProcessFdatChunkAsIdat(png_uint_32 fdat_length);
-  // Returns false on a fatal error.
-  bool CheckSequenceNumber(const png_byte* position);
-  bool FirstFrameFullyReceived() const {
-    return !frame_info_.IsEmpty() &&
-           frame_info_[0].byte_length != kFirstFrameIndicator;
-  }
-};
-
-}  // namespace blink
-
-#endif