1 files changed, 76 insertions, 0 deletions
diff --git a/core/fxcodec/gif/cfx_gifcontext.h b/core/fxcodec/gif/cfx_gifcontext.h
new file mode 100644
index 0000000000..a1cffb2746
--- /dev/null
+++ b/core/fxcodec/gif/cfx_gifcontext.h
@@ -0,0 +1,76 @@
+// Copyright 2017 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef CORE_FXCODEC_GIF_CFX_GIFCONTEXT_H_
+#define CORE_FXCODEC_GIF_CFX_GIFCONTEXT_H_
+
+#include <memory>
+#include <vector>
+
+#include "core/fxcodec/codec/ccodec_gifmodule.h"
+#include "core/fxcodec/gif/cfx_gif.h"
+#include "core/fxcodec/gif/cfx_lzwdecompressor.h"
+#include "core/fxcrt/fx_string.h"
+#include "core/fxcrt/unowned_ptr.h"
+
+class CFX_GifContext : public CCodec_GifModule::Context {
+ public:
+  CFX_GifContext(CCodec_GifModule* gif_module,
+                 CCodec_GifModule::Delegate* delegate);
+  ~CFX_GifContext() override;
+
+  void RecordCurrentPosition(uint32_t* cur_pos);
+  void ReadScanline(int32_t row_num, uint8_t* row_buf);
+  bool GetRecordPosition(uint32_t cur_pos,
+                         int32_t left,
+                         int32_t top,
+                         int32_t width,
+                         int32_t height,
+                         int32_t pal_num,
+                         CFX_GifPalette* pal,
+                         int32_t delay_time,
+                         bool user_input,
+                         int32_t trans_index,
+                         int32_t disposal_method,
+                         bool interlace);
+  CFX_GifDecodeStatus ReadHeader();
+  CFX_GifDecodeStatus GetFrame();
+  CFX_GifDecodeStatus LoadFrame(int32_t frame_num);
+  void SetInputBuffer(uint8_t* src_buf, uint32_t src_size);
+  uint32_t GetAvailInput(uint8_t** avail_buf) const;
+  int32_t GetFrameNum() const;
+
+  UnownedPtr<CCodec_GifModule> gif_module_;
+  UnownedPtr<CCodec_GifModule::Delegate> delegate_;
+  std::vector<CFX_GifPalette> global_palette_;
+  uint8_t global_pal_exp_;
+  uint32_t img_row_offset_;
+  uint32_t img_row_avail_size_;
+  uint32_t avail_in_;
+  int32_t decode_status_;
+  uint32_t skip_size_;
+  ByteString cmt_data_;
+  std::unique_ptr<CFX_GifGraphicControlExtension> graphic_control_extension_;
+  uint8_t* next_in_;
+  std::vector<std::unique_ptr<CFX_GifImage>> images_;
+  std::unique_ptr<CFX_LZWDecompressor> lzw_decompressor_;
+  int width_;
+  int height_;
+  uint8_t bc_index_;
+  uint8_t pixel_aspect_;
+  uint8_t global_sort_flag_;
+  uint8_t global_color_resolution_;
+  uint8_t img_pass_num_;
+
+ private:
+  uint8_t* ReadData(uint8_t** des_buf_pp, uint32_t data_size);
+  void SaveDecodingStatus(int32_t status);
+  CFX_GifDecodeStatus DecodeExtension();
+  CFX_GifDecodeStatus DecodeImageInfo();
+  void DecodingFailureAtTailCleanup(CFX_GifImage* gif_image);
+};
+
+#endif  // CORE_FXCODEC_GIF_CFX_GIFCONTEXT_H_