Cleaning up naming of GIF files/classes/variables

Moved everything from core/fxcodec/lgif to core/fxcodec/gif
Converted CGifContext -> CFX_GifContext
Removed _ptr suffixes from CXF_GifContext
Movef fx_gif.* -> cfx_gif.*
Renamed structs in cfx_gif.h
Renamed members of CFX_GifImage
Renamed members of CFX_GifContext
Renamed CFX_LZWDecoder -> CFX_LZWDecompressor

BUG=pdfium:903

Change-Id: I537e905e935da26832e6bbdc03e0373ed5500bcb
Reviewed-on: https://pdfium-review.googlesource.com/14990
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

7 files changed, 0 insertions, 1160 deletions

diff --git a/core/fxcodec/lgif/cfx_lzwdecoder.cpp b/core/fxcodec/lgif/cfx_lzwdecoder.cpp
deleted file mode 100644
index 9479eeafaa..0000000000
--- a/core/fxcodec/lgif/cfx_lzwdecoder.cpp
+++ /dev/null
@@ -1,184 +0,0 @@
-// 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
-
-#include "core/fxcodec/lgif/cfx_lzwdecoder.h"
-
-#include <algorithm>
-#include <memory>
-#include <utility>
-
-#include "core/fxcodec/lbmp/fx_bmp.h"
-#include "third_party/base/numerics/safe_math.h"
-#include "third_party/base/ptr_util.h"
-#include "third_party/base/stl_util.h"
-
-std::unique_ptr<CFX_LZWDecoder> CFX_LZWDecoder::Create(uint8_t color_exp,
-                                                       uint8_t code_exp) {
-  if (code_exp > GIF_MAX_LZW_EXP || code_exp + 1 < color_exp)
-    return nullptr;
-  return std::unique_ptr<CFX_LZWDecoder>(
-      new CFX_LZWDecoder(color_exp, code_exp));
-}
-
-CFX_LZWDecoder::CFX_LZWDecoder(uint8_t color_exp, uint8_t code_exp)
-    : code_size_(code_exp),
-      code_size_cur_(0),
-      code_color_end_(static_cast<uint16_t>(2 << color_exp)),
-      code_clear_(static_cast<uint16_t>(1 << code_exp)),
-      code_end_(static_cast<uint16_t>((1 << code_exp) + 1)),
-      code_next_(0),
-      code_first_(0),
-      stack_size_(0),
-      code_old_(0),
-      next_in_(nullptr),
-      avail_in_(0),
-      bits_left_(0),
-      code_store_(0) {}
-
-CFX_LZWDecoder::~CFX_LZWDecoder() {}
-
-GifDecodeStatus CFX_LZWDecoder::Decode(uint8_t* src_buf,
-                                       uint32_t src_size,
-                                       uint8_t* des_buf,
-                                       uint32_t* des_size) {
-  if (!src_buf || src_size == 0 || !des_buf || !des_size)
-    return GifDecodeStatus::Error;
-
-  if (*des_size == 0)
-    return GifDecodeStatus::InsufficientDestSize;
-
-  next_in_ = src_buf;
-  avail_in_ = src_size;
-
-  ClearTable();
-
-  uint32_t i = 0;
-  if (stack_size_ != 0) {
-    if (*des_size < stack_size_) {
-      memcpy(des_buf, &stack_[GIF_MAX_LZW_CODE - stack_size_], *des_size);
-      stack_size_ -= static_cast<uint16_t>(*des_size);
-      return GifDecodeStatus::InsufficientDestSize;
-    }
-
-    memcpy(des_buf, &stack_[GIF_MAX_LZW_CODE - stack_size_], stack_size_);
-    des_buf += stack_size_;
-    i += stack_size_;
-    stack_size_ = 0;
-  }
-
-  while (i <= *des_size && (avail_in_ > 0 || bits_left_ >= code_size_cur_)) {
-    if (code_size_cur_ > GIF_MAX_LZW_EXP)
-      return GifDecodeStatus::Error;
-
-    if (avail_in_ > 0) {
-      if (bits_left_ > 31)
-        return GifDecodeStatus::Error;
-
-      pdfium::base::CheckedNumeric<uint32_t> safe_code = *next_in_++;
-      safe_code <<= bits_left_;
-      safe_code |= code_store_;
-      if (!safe_code.IsValid())
-        return GifDecodeStatus::Error;
-
-      code_store_ = safe_code.ValueOrDie();
-      --avail_in_;
-      bits_left_ += 8;
-    }
-
-    while (bits_left_ >= code_size_cur_) {
-      uint16_t code =
-          static_cast<uint16_t>(code_store_) & ((1 << code_size_cur_) - 1);
-      code_store_ >>= code_size_cur_;
-      bits_left_ -= code_size_cur_;
-      if (code == code_clear_) {
-        ClearTable();
-        continue;
-      }
-      if (code == code_end_) {
-        *des_size = i;
-        return GifDecodeStatus::Success;
-      }
-
-      if (code_old_ != static_cast<uint16_t>(-1)) {
-        if (code_next_ < GIF_MAX_LZW_CODE) {
-          if (code == code_next_) {
-            AddCode(code_old_, code_first_);
-            if (!DecodeString(code))
-              return GifDecodeStatus::Error;
-          } else if (code > code_next_) {
-            return GifDecodeStatus::Error;
-          } else {
-            if (!DecodeString(code))
-              return GifDecodeStatus::Error;
-
-            uint8_t append_char = stack_[GIF_MAX_LZW_CODE - stack_size_];
-            AddCode(code_old_, append_char);
-          }
-        }
-      } else {
-        if (!DecodeString(code))
-          return GifDecodeStatus::Error;
-      }
-
-      code_old_ = code;
-      if (i + stack_size_ > *des_size) {
-        memcpy(des_buf, &stack_[GIF_MAX_LZW_CODE - stack_size_], *des_size - i);
-        stack_size_ -= static_cast<uint16_t>(*des_size - i);
-        return GifDecodeStatus::InsufficientDestSize;
-      }
-
-      memcpy(des_buf, &stack_[GIF_MAX_LZW_CODE - stack_size_], stack_size_);
-      des_buf += stack_size_;
-      i += stack_size_;
-      stack_size_ = 0;
-    }
-  }
-
-  if (avail_in_ != 0)
-    return GifDecodeStatus::Error;
-
-  *des_size = i;
-  return GifDecodeStatus::Unfinished;
-}
-
-void CFX_LZWDecoder::ClearTable() {
-  code_size_cur_ = code_size_ + 1;
-  code_next_ = code_end_ + 1;
-  code_old_ = static_cast<uint16_t>(-1);
-  memset(code_table_, 0, sizeof(code_table_));
-  memset(stack_, 0, sizeof(stack_));
-  for (uint16_t i = 0; i < code_clear_; i++)
-    code_table_[i].suffix = static_cast<uint8_t>(i);
-}
-
-void CFX_LZWDecoder::AddCode(uint16_t prefix_code, uint8_t append_char) {
-  if (code_next_ == GIF_MAX_LZW_CODE)
-    return;
-
-  code_table_[code_next_].prefix = prefix_code;
-  code_table_[code_next_].suffix = append_char;
-  if (++code_next_ < GIF_MAX_LZW_CODE) {
-    if (code_next_ >> code_size_cur_)
-      code_size_cur_++;
-  }
-}
-
-bool CFX_LZWDecoder::DecodeString(uint16_t code) {
-  stack_size_ = 0;
-  while (code >= code_clear_ && code <= code_next_) {
-    if (code == code_table_[code].prefix || stack_size_ == GIF_MAX_LZW_CODE - 1)
-      return false;
-
-    stack_[GIF_MAX_LZW_CODE - 1 - stack_size_++] = code_table_[code].suffix;
-    code = code_table_[code].prefix;
-  }
-  if (code >= code_color_end_)
-    return false;
-
-  stack_[GIF_MAX_LZW_CODE - 1 - stack_size_++] = static_cast<uint8_t>(code);
-  code_first_ = static_cast<uint8_t>(code);
-  return true;
-}
diff --git a/core/fxcodec/lgif/cfx_lzwdecoder.h b/core/fxcodec/lgif/cfx_lzwdecoder.h
deleted file mode 100644
index 9dbf15d9b7..0000000000
--- a/core/fxcodec/lgif/cfx_lzwdecoder.h
+++ /dev/null
@@ -1,55 +0,0 @@
-// 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_LGIF_CFX_LZWDECODER_H_
-#define CORE_FXCODEC_LGIF_CFX_LZWDECODER_H_
-
-#include <memory>
-#include <vector>
-
-#include "core/fxcodec/lgif/fx_gif.h"
-
-class CFX_LZWDecoder {
- public:
-  typedef struct {
-    uint16_t prefix;
-    uint8_t suffix;
-  } CodeEntry;
-
-  // Returns nullptr on error
-  static std::unique_ptr<CFX_LZWDecoder> Create(uint8_t color_exp,
-                                                uint8_t code_exp);
-  ~CFX_LZWDecoder();
-
-  GifDecodeStatus Decode(uint8_t* src_buf,
-                         uint32_t src_size,
-                         uint8_t* des_buf,
-                         uint32_t* des_size);
-
- private:
-  CFX_LZWDecoder(uint8_t color_exp, uint8_t code_exp);
-  void ClearTable();
-  void AddCode(uint16_t prefix_code, uint8_t append_char);
-  bool DecodeString(uint16_t code);
-
-  uint8_t code_size_;
-  uint8_t code_size_cur_;
-  uint16_t code_color_end_;
-  uint16_t code_clear_;
-  uint16_t code_end_;
-  uint16_t code_next_;
-  uint8_t code_first_;
-  uint8_t stack_[GIF_MAX_LZW_CODE];
-  size_t stack_size_;
-  CodeEntry code_table_[GIF_MAX_LZW_CODE];
-  uint16_t code_old_;
-  uint8_t* next_in_;
-  uint32_t avail_in_;
-  uint8_t bits_left_;
-  uint32_t code_store_;
-};
-
-#endif  // CORE_FXCODEC_LGIF_CFX_LZWDECODER_H_
diff --git a/core/fxcodec/lgif/cfx_lzwdecoder_unittest.cpp b/core/fxcodec/lgif/cfx_lzwdecoder_unittest.cpp
deleted file mode 100644
index 9e4b7b788e..0000000000
--- a/core/fxcodec/lgif/cfx_lzwdecoder_unittest.cpp
+++ /dev/null
@@ -1,147 +0,0 @@
-// 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.
-
-#include "core/fxcodec/lgif/cfx_lzwdecoder.h"
-
-#include "core/fxcrt/fx_memory.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-TEST(CFX_LZWDecoder, CreateBadParams) {
-  EXPECT_EQ(nullptr, CFX_LZWDecoder::Create(0x10, 0x2));
-  EXPECT_EQ(nullptr, CFX_LZWDecoder::Create(0x4, 0x0F));
-}
-
-TEST(CFX_LZWDecoder, DecodeBadParams) {
-  uint8_t palette_exp = 0x0;
-  uint8_t code_exp = 0x2;
-
-  auto decoder = CFX_LZWDecoder::Create(palette_exp, code_exp);
-  ASSERT_NE(nullptr, decoder);
-
-  uint8_t image_data[10];
-  uint32_t image_size = FX_ArraySize(image_data);
-
-  uint8_t output_data[10];
-  uint32_t output_size = FX_ArraySize(output_data);
-
-  EXPECT_EQ(GifDecodeStatus::Error,
-            decoder->Decode(nullptr, image_size, output_data, &output_size));
-  EXPECT_EQ(GifDecodeStatus::Error,
-            decoder->Decode(image_data, 0, output_data, &output_size));
-  EXPECT_EQ(GifDecodeStatus::Error,
-            decoder->Decode(image_data, image_size, nullptr, &output_size));
-  EXPECT_EQ(GifDecodeStatus::Error,
-            decoder->Decode(image_data, image_size, output_data, nullptr));
-
-  output_size = 0;
-  EXPECT_EQ(GifDecodeStatus::InsufficientDestSize,
-            decoder->Decode(image_data, image_size, output_data, &output_size));
-}
-
-TEST(CFX_LZWDecoder, Decode1x1SingleColour) {
-  uint8_t palette_exp = 0x0;
-  uint8_t code_exp = 0x2;
-
-  auto decoder = CFX_LZWDecoder::Create(palette_exp, code_exp);
-  ASSERT_NE(nullptr, decoder);
-
-  uint8_t image_data[] = {0x44, 0x01};
-  uint32_t image_size = FX_ArraySize(image_data);
-
-  uint8_t output_data[1];
-  uint32_t output_size = FX_ArraySize(output_data);
-
-  EXPECT_EQ(GifDecodeStatus::Success,
-            decoder->Decode(image_data, image_size, output_data, &output_size));
-  uint8_t expected_data[] = {0x00};
-
-  EXPECT_EQ(FX_ArraySize(output_data), output_size);
-  EXPECT_TRUE(0 == memcmp(expected_data, output_data, sizeof(expected_data)));
-}
-
-TEST(CFX_LZWDecoder, Decode10x10SingleColour) {
-  uint8_t palette_exp = 0x0;
-  uint8_t code_exp = 0x2;
-
-  auto decoder = CFX_LZWDecoder::Create(palette_exp, code_exp);
-  ASSERT_NE(nullptr, decoder);
-
-  uint8_t image_data[] = {0x84, 0x8F, 0xA9, 0xCB, 0xED, 0x0F, 0x63, 0x2B};
-  uint32_t image_size = FX_ArraySize(image_data);
-
-  uint8_t output_data[100];
-  memset(output_data, 0, sizeof(output_data));
-  uint32_t output_size = FX_ArraySize(output_data);
-
-  EXPECT_EQ(GifDecodeStatus::Success,
-            decoder->Decode(image_data, image_size, output_data, &output_size));
-  uint8_t expected_data[] = {
-      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-      0x00, 0x00, 0x00, 0x00};
-
-  EXPECT_EQ(FX_ArraySize(output_data), output_size);
-  EXPECT_TRUE(0 == memcmp(expected_data, output_data, sizeof(expected_data)));
-}
-
-TEST(CFX_LZWDecoder, Decode10x10MultipleColour) {
-  uint8_t palette_exp = 0x1;
-  uint8_t code_exp = 0x2;
-
-  auto decoder = CFX_LZWDecoder::Create(palette_exp, code_exp);
-  ASSERT_NE(nullptr, decoder);
-
-  uint8_t image_data[] = {0x8C, 0x2D, 0x99, 0x87, 0x2A, 0x1C, 0xDC, 0x33,
-                          0xA0, 0x02, 0x75, 0xEC, 0x95, 0xFA, 0xA8, 0xDE,
-                          0x60, 0x8C, 0x04, 0x91, 0x4C, 0x01};
-  uint32_t image_size = FX_ArraySize(image_data);
-
-  uint8_t output_data[100];
-  memset(output_data, 0, sizeof(output_data));
-  uint32_t output_size = FX_ArraySize(output_data);
-
-  EXPECT_EQ(GifDecodeStatus::Success,
-            decoder->Decode(image_data, image_size, output_data, &output_size));
-  uint8_t expected_data[] = {
-      0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01,
-      0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01,
-      0x01, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00,
-      0x00, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x02,
-      0x02, 0x02, 0x02, 0x02, 0x02, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01,
-      0x02, 0x02, 0x02, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x02, 0x02,
-      0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02,
-      0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01,
-      0x01, 0x01, 0x01, 0x01};
-
-  EXPECT_EQ(FX_ArraySize(output_data), output_size);
-  EXPECT_TRUE(0 == memcmp(expected_data, output_data, sizeof(expected_data)));
-}
-
-TEST(CFX_LZWDecoder, HandleColourCodeOutOfPalette) {
-  uint8_t palette_exp = 0x2;  // Image uses 10 colours, so the palette exp
-                              // should be 3, 2^(3+1) = 16 colours.
-  uint8_t code_exp = 0x4;
-
-  auto decoder = CFX_LZWDecoder::Create(palette_exp, code_exp);
-  ASSERT_NE(nullptr, decoder);
-
-  uint8_t image_data[] = {0x30, 0xC9, 0x49, 0x81, 0xBD, 0x78, 0xE8, 0xCD,
-                          0x89, 0xFF, 0x60, 0x20, 0x8E, 0xE4, 0x61, 0x9E,
-                          0xA8, 0xA1, 0xAE, 0x2C, 0xE2, 0xBE, 0xB0, 0x20,
-                          0xCF, 0x74, 0x61, 0xDF, 0x78, 0x04};
-  uint32_t image_size = FX_ArraySize(image_data);
-
-  uint8_t output_data[100];
-  memset(output_data, 0, sizeof(output_data));
-  uint32_t output_size = FX_ArraySize(output_data);
-
-  EXPECT_EQ(GifDecodeStatus::Error,
-            decoder->Decode(image_data, image_size, output_data, &output_size));
-}
diff --git a/core/fxcodec/lgif/cgifcontext.cpp b/core/fxcodec/lgif/cgifcontext.cpp
deleted file mode 100644
index af1895316f..0000000000
--- a/core/fxcodec/lgif/cgifcontext.cpp
+++ /dev/null
@@ -1,549 +0,0 @@
-// 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
-
-#include "core/fxcodec/lgif/cgifcontext.h"
-
-#include <algorithm>
-#include <utility>
-
-#include "core/fxcodec/codec/ccodec_gifmodule.h"
-#include "core/fxcodec/lbmp/fx_bmp.h"
-#include "core/fxcodec/lgif/fx_gif.h"
-#include "third_party/base/ptr_util.h"
-#include "third_party/base/stl_util.h"
-
-namespace {
-
-const int32_t s_gif_interlace_step[4] = {8, 8, 4, 2};
-
-}  // namespace
-
-CGifContext::CGifContext(CCodec_GifModule* gif_module,
-                         CCodec_GifModule::Delegate* pDelegate)
-    : m_pModule(gif_module),
-      m_pDelegate(pDelegate),
-      global_pal_exp(0),
-      img_row_offset(0),
-      img_row_avail_size(0),
-      avail_in(0),
-      decode_status(GIF_D_STATUS_SIG),
-      skip_size(0),
-      next_in(nullptr),
-      width(0),
-      height(0),
-      bc_index(0),
-      pixel_aspect(0),
-      global_sort_flag(0),
-      global_color_resolution(0),
-      img_pass_num(0) {
-}
-
-CGifContext::~CGifContext() {}
-
-void CGifContext::RecordCurrentPosition(uint32_t* cur_pos_ptr) {
-  m_pDelegate->GifRecordCurrentPosition(*cur_pos_ptr);
-}
-
-void CGifContext::ReadScanline(int32_t row_num, uint8_t* row_buf) {
-  m_pDelegate->GifReadScanline(row_num, row_buf);
-}
-
-bool CGifContext::GetRecordPosition(uint32_t cur_pos,
-                                    int32_t left,
-                                    int32_t top,
-                                    int32_t width,
-                                    int32_t height,
-                                    int32_t pal_num,
-                                    GifPalette* pal_ptr,
-                                    int32_t delay_time,
-                                    bool user_input,
-                                    int32_t trans_index,
-                                    int32_t disposal_method,
-                                    bool interlace) {
-  return m_pDelegate->GifInputRecordPositionBuf(
-      cur_pos, FX_RECT(left, top, left + width, top + height), pal_num, pal_ptr,
-      delay_time, user_input, trans_index, disposal_method, interlace);
-}
-
-GifDecodeStatus CGifContext::ReadHeader() {
-  uint32_t skip_size_org = skip_size;
-  GifHeader* gif_header_ptr = nullptr;
-  if (!ReadData(reinterpret_cast<uint8_t**>(&gif_header_ptr), 6))
-    return GifDecodeStatus::Unfinished;
-
-  if (strncmp(gif_header_ptr->signature, GIF_SIGNATURE, 3) != 0 ||
-      gif_header_ptr->version[0] != '8' || gif_header_ptr->version[2] != 'a')
-    return GifDecodeStatus::Error;
-
-  GifLocalScreenDescriptor* gif_lsd_ptr = nullptr;
-  if (!ReadData(reinterpret_cast<uint8_t**>(&gif_lsd_ptr), 7)) {
-    skip_size = skip_size_org;
-    return GifDecodeStatus::Unfinished;
-  }
-
-  if (gif_lsd_ptr->global_flags.global_pal) {
-    global_pal_exp = gif_lsd_ptr->global_flags.pal_bits;
-    uint32_t global_pal_size = unsigned(2 << global_pal_exp) * 3u;
-    uint8_t* global_pal_ptr = nullptr;
-    if (!ReadData(&global_pal_ptr, global_pal_size)) {
-      skip_size = skip_size_org;
-      return GifDecodeStatus::Unfinished;
-    }
-
-    global_sort_flag = gif_lsd_ptr->global_flags.sort_flag;
-    global_color_resolution = gif_lsd_ptr->global_flags.color_resolution;
-    m_GlobalPalette.resize(global_pal_size / 3);
-    memcpy(m_GlobalPalette.data(), global_pal_ptr, global_pal_size);
-  }
-
-  width = static_cast<int>(
-      GetWord_LSBFirst(reinterpret_cast<uint8_t*>(&gif_lsd_ptr->width)));
-  height = static_cast<int>(
-      GetWord_LSBFirst(reinterpret_cast<uint8_t*>(&gif_lsd_ptr->height)));
-  bc_index = gif_lsd_ptr->bc_index;
-  pixel_aspect = gif_lsd_ptr->pixel_aspect;
-  return GifDecodeStatus::Success;
-}
-
-GifDecodeStatus CGifContext::GetFrame() {
-  GifDecodeStatus ret = GifDecodeStatus::Success;
-  while (true) {
-    switch (decode_status) {
-      case GIF_D_STATUS_TAIL:
-        return GifDecodeStatus::Success;
-      case GIF_D_STATUS_SIG: {
-        uint8_t* sig_ptr = nullptr;
-        if (!ReadData(&sig_ptr, 1))
-          return GifDecodeStatus::Unfinished;
-
-        switch (*sig_ptr) {
-          case GIF_SIG_EXTENSION:
-            SaveDecodingStatus(GIF_D_STATUS_EXT);
-            continue;
-          case GIF_SIG_IMAGE:
-            SaveDecodingStatus(GIF_D_STATUS_IMG_INFO);
-            continue;
-          case GIF_SIG_TRAILER:
-            SaveDecodingStatus(GIF_D_STATUS_TAIL);
-            return GifDecodeStatus::Success;
-          default:
-            if (avail_in) {
-              // The Gif File has non_standard Tag!
-              SaveDecodingStatus(GIF_D_STATUS_SIG);
-              continue;
-            }
-            // The Gif File Doesn't have Trailer Tag!
-            return GifDecodeStatus::Success;
-        }
-      }
-      case GIF_D_STATUS_EXT: {
-        uint8_t* ext_ptr = nullptr;
-        if (!ReadData(&ext_ptr, 1))
-          return GifDecodeStatus::Unfinished;
-
-        switch (*ext_ptr) {
-          case GIF_BLOCK_CE:
-            SaveDecodingStatus(GIF_D_STATUS_EXT_CE);
-            continue;
-          case GIF_BLOCK_GCE:
-            SaveDecodingStatus(GIF_D_STATUS_EXT_GCE);
-            continue;
-          case GIF_BLOCK_PTE:
-            SaveDecodingStatus(GIF_D_STATUS_EXT_PTE);
-            continue;
-          default: {
-            int32_t status = GIF_D_STATUS_EXT_UNE;
-            if (*ext_ptr == GIF_BLOCK_PTE) {
-              status = GIF_D_STATUS_EXT_PTE;
-            }
-            SaveDecodingStatus(status);
-            continue;
-          }
-        }
-      }
-      case GIF_D_STATUS_IMG_INFO: {
-        ret = DecodeImageInfo();
-        if (ret != GifDecodeStatus::Success)
-          return ret;
-
-        continue;
-      }
-      case GIF_D_STATUS_IMG_DATA: {
-        uint8_t* data_size_ptr = nullptr;
-        uint8_t* data_ptr = nullptr;
-        uint32_t skip_size_org = skip_size;
-        if (!ReadData(&data_size_ptr, 1))
-          return GifDecodeStatus::Unfinished;
-
-        while (*data_size_ptr != GIF_BLOCK_TERMINAL) {
-          if (!ReadData(&data_ptr, *data_size_ptr)) {
-            skip_size = skip_size_org;
-            return GifDecodeStatus::Unfinished;
-          }
-
-          SaveDecodingStatus(GIF_D_STATUS_IMG_DATA);
-          skip_size_org = skip_size;
-          if (!ReadData(&data_size_ptr, 1))
-            return GifDecodeStatus::Unfinished;
-        }
-        SaveDecodingStatus(GIF_D_STATUS_SIG);
-        continue;
-      }
-      default: {
-        ret = DecodeExtension();
-        if (ret != GifDecodeStatus::Success)
-          return ret;
-        break;
-      }
-    }
-  }
-  return GifDecodeStatus::Success;
-}
-
-GifDecodeStatus CGifContext::LoadFrame(int32_t frame_num) {
-  if (!pdfium::IndexInBounds(m_Images, frame_num))
-    return GifDecodeStatus::Error;
-
-  uint8_t* data_size_ptr = nullptr;
-  uint8_t* data_ptr = nullptr;
-  uint32_t skip_size_org = skip_size;
-  GifImage* gif_image_ptr = m_Images[frame_num].get();
-  uint32_t gif_img_row_bytes = gif_image_ptr->m_ImageInfo.width;
-  if (gif_img_row_bytes == 0)
-    return GifDecodeStatus::Error;
-
-  if (decode_status == GIF_D_STATUS_TAIL) {
-    gif_image_ptr->m_ImageRowBuf.resize(gif_img_row_bytes);
-    GifGraphicControlExtension* gif_img_gce_ptr =
-        gif_image_ptr->m_ImageGCE.get();
-    int32_t loc_pal_num =
-        gif_image_ptr->m_ImageInfo.local_flags.local_pal
-            ? (2 << gif_image_ptr->m_ImageInfo.local_flags.pal_bits)
-            : 0;
-    avail_in = 0;
-    GifPalette* pLocalPalette = gif_image_ptr->m_LocalPalettes.empty()
-                                    ? nullptr
-                                    : gif_image_ptr->m_LocalPalettes.data();
-    if (!gif_img_gce_ptr) {
-      bool bRes = GetRecordPosition(
-          gif_image_ptr->image_data_pos, gif_image_ptr->m_ImageInfo.left,
-          gif_image_ptr->m_ImageInfo.top, gif_image_ptr->m_ImageInfo.width,
-          gif_image_ptr->m_ImageInfo.height, loc_pal_num, pLocalPalette, 0, 0,
-          -1, 0, gif_image_ptr->m_ImageInfo.local_flags.interlace);
-      if (!bRes) {
-        gif_image_ptr->m_ImageRowBuf.clear();
-        return GifDecodeStatus::Error;
-      }
-    } else {
-      bool bRes = GetRecordPosition(
-          gif_image_ptr->image_data_pos, gif_image_ptr->m_ImageInfo.left,
-          gif_image_ptr->m_ImageInfo.top, gif_image_ptr->m_ImageInfo.width,
-          gif_image_ptr->m_ImageInfo.height, loc_pal_num, pLocalPalette,
-          static_cast<int32_t>(gif_image_ptr->m_ImageGCE->delay_time),
-          gif_image_ptr->m_ImageGCE->gce_flags.user_input,
-          gif_image_ptr->m_ImageGCE->gce_flags.transparency
-              ? static_cast<int32_t>(gif_image_ptr->m_ImageGCE->trans_index)
-              : -1,
-          static_cast<int32_t>(
-              gif_image_ptr->m_ImageGCE->gce_flags.disposal_method),
-          gif_image_ptr->m_ImageInfo.local_flags.interlace);
-      if (!bRes) {
-        gif_image_ptr->m_ImageRowBuf.clear();
-        return GifDecodeStatus::Error;
-      }
-    }
-
-    if (gif_image_ptr->image_code_exp > GIF_MAX_LZW_EXP) {
-      gif_image_ptr->m_ImageRowBuf.clear();
-      return GifDecodeStatus::Error;
-    }
-
-    img_row_offset = 0;
-    img_row_avail_size = 0;
-    img_pass_num = 0;
-    gif_image_ptr->image_row_num = 0;
-    SaveDecodingStatus(GIF_D_STATUS_IMG_DATA);
-  }
-
-  if (decode_status == GIF_D_STATUS_IMG_DATA) {
-    if (!ReadData(&data_size_ptr, 1))
-      return GifDecodeStatus::Unfinished;
-
-    if (*data_size_ptr != GIF_BLOCK_TERMINAL) {
-      if (!ReadData(&data_ptr, *data_size_ptr)) {
-        skip_size = skip_size_org;
-        return GifDecodeStatus::Unfinished;
-      }
-
-      if (!m_ImgDecoder.get())
-        m_ImgDecoder =
-            CFX_LZWDecoder::Create(!gif_image_ptr->m_LocalPalettes.empty()
-                                       ? gif_image_ptr->local_pallette_exp
-                                       : global_pal_exp,
-                                   gif_image_ptr->image_code_exp);
-      SaveDecodingStatus(GIF_D_STATUS_IMG_DATA);
-      img_row_offset += img_row_avail_size;
-      img_row_avail_size = gif_img_row_bytes - img_row_offset;
-      GifDecodeStatus ret =
-          m_ImgDecoder.get()
-              ? m_ImgDecoder->Decode(
-                    data_ptr, *data_size_ptr,
-                    gif_image_ptr->m_ImageRowBuf.data() + img_row_offset,
-                    &img_row_avail_size)
-              : GifDecodeStatus::Error;
-      if (ret == GifDecodeStatus::Error) {
-        DecodingFailureAtTailCleanup(gif_image_ptr);
-        return GifDecodeStatus::Error;
-      }
-      while (ret != GifDecodeStatus::Error) {
-        if (ret == GifDecodeStatus::Success) {
-          ReadScanline(gif_image_ptr->image_row_num,
-                       gif_image_ptr->m_ImageRowBuf.data());
-          gif_image_ptr->m_ImageRowBuf.clear();
-          SaveDecodingStatus(GIF_D_STATUS_TAIL);
-          return GifDecodeStatus::Success;
-        }
-        if (ret == GifDecodeStatus::Unfinished) {
-          skip_size_org = skip_size;
-          if (!ReadData(&data_size_ptr, 1))
-            return GifDecodeStatus::Unfinished;
-
-          if (*data_size_ptr != GIF_BLOCK_TERMINAL) {
-            if (!ReadData(&data_ptr, *data_size_ptr)) {
-              skip_size = skip_size_org;
-              return GifDecodeStatus::Unfinished;
-            }
-            if (!m_ImgDecoder.get())
-              m_ImgDecoder =
-                  CFX_LZWDecoder::Create(!gif_image_ptr->m_LocalPalettes.empty()
-                                             ? gif_image_ptr->local_pallette_exp
-                                             : global_pal_exp,
-                                         gif_image_ptr->image_code_exp);
-            SaveDecodingStatus(GIF_D_STATUS_IMG_DATA);
-            img_row_offset += img_row_avail_size;
-            img_row_avail_size = gif_img_row_bytes - img_row_offset;
-            ret =
-                m_ImgDecoder.get()
-                    ? m_ImgDecoder->Decode(
-                          data_ptr, *data_size_ptr,
-                          gif_image_ptr->m_ImageRowBuf.data() + img_row_offset,
-                          &img_row_avail_size)
-                    : GifDecodeStatus::Error;
-          }
-        }
-        if (ret == GifDecodeStatus::InsufficientDestSize) {
-          if (gif_image_ptr->m_ImageInfo.local_flags.interlace) {
-            ReadScanline(gif_image_ptr->image_row_num,
-                         gif_image_ptr->m_ImageRowBuf.data());
-            gif_image_ptr->image_row_num += s_gif_interlace_step[img_pass_num];
-            if (gif_image_ptr->image_row_num >=
-                static_cast<int32_t>(gif_image_ptr->m_ImageInfo.height)) {
-              img_pass_num++;
-              if (img_pass_num == FX_ArraySize(s_gif_interlace_step)) {
-                DecodingFailureAtTailCleanup(gif_image_ptr);
-                return GifDecodeStatus::Error;
-              }
-              gif_image_ptr->image_row_num =
-                  s_gif_interlace_step[img_pass_num] / 2;
-            }
-          } else {
-            ReadScanline(gif_image_ptr->image_row_num++,
-                         gif_image_ptr->m_ImageRowBuf.data());
-          }
-          img_row_offset = 0;
-          img_row_avail_size = gif_img_row_bytes;
-          ret = m_ImgDecoder.get()
-                    ? m_ImgDecoder->Decode(
-                          data_ptr, *data_size_ptr,
-                          gif_image_ptr->m_ImageRowBuf.data() + img_row_offset,
-                          &img_row_avail_size)
-                    : GifDecodeStatus::Error;
-        }
-        if (ret == GifDecodeStatus::Error) {
-          DecodingFailureAtTailCleanup(gif_image_ptr);
-          return GifDecodeStatus::Error;
-        }
-      }
-    }
-    SaveDecodingStatus(GIF_D_STATUS_TAIL);
-  }
-  return GifDecodeStatus::Error;
-}
-
-void CGifContext::SetInputBuffer(uint8_t* src_buf, uint32_t src_size) {
-  next_in = src_buf;
-  avail_in = src_size;
-  skip_size = 0;
-}
-
-uint32_t CGifContext::GetAvailInput(uint8_t** avail_buf_ptr) const {
-  if (avail_buf_ptr) {
-    *avail_buf_ptr = nullptr;
-    if (avail_in > 0)
-      *avail_buf_ptr = next_in;
-  }
-  return avail_in;
-}
-
-int32_t CGifContext::GetFrameNum() const {
-  return pdfium::CollectionSize<int32_t>(m_Images);
-}
-
-uint8_t* CGifContext::ReadData(uint8_t** des_buf_pp, uint32_t data_size) {
-  if (avail_in < skip_size + data_size)
-    return nullptr;
-
-  *des_buf_pp = next_in + skip_size;
-  skip_size += data_size;
-  return *des_buf_pp;
-}
-
-void CGifContext::SaveDecodingStatus(int32_t status) {
-  decode_status = status;
-  next_in += skip_size;
-  avail_in -= skip_size;
-  skip_size = 0;
-}
-
-GifDecodeStatus CGifContext::DecodeExtension() {
-  uint8_t* data_size_ptr = nullptr;
-  uint8_t* data_ptr = nullptr;
-  uint32_t skip_size_org = skip_size;
-  switch (decode_status) {
-    case GIF_D_STATUS_EXT_CE: {
-      if (!ReadData(&data_size_ptr, 1)) {
-        skip_size = skip_size_org;
-        return GifDecodeStatus::Unfinished;
-      }
-
-      cmt_data.clear();
-      while (*data_size_ptr != GIF_BLOCK_TERMINAL) {
-        uint8_t data_size = *data_size_ptr;
-        if (!ReadData(&data_ptr, *data_size_ptr) ||
-            !ReadData(&data_size_ptr, 1)) {
-          skip_size = skip_size_org;
-          return GifDecodeStatus::Unfinished;
-        }
-
-        cmt_data += ByteString(data_ptr, data_size);
-      }
-      break;
-    }
-    case GIF_D_STATUS_EXT_PTE: {
-      GifPlainTextExtension* gif_pte = nullptr;
-      if (!ReadData(reinterpret_cast<uint8_t**>(&gif_pte), 13))
-        return GifDecodeStatus::Unfinished;
-
-      m_GraphicControlExtension = nullptr;
-      if (!ReadData(&data_size_ptr, 1)) {
-        skip_size = skip_size_org;
-        return GifDecodeStatus::Unfinished;
-      }
-
-      while (*data_size_ptr != GIF_BLOCK_TERMINAL) {
-        if (!ReadData(&data_ptr, *data_size_ptr) ||
-            !ReadData(&data_size_ptr, 1)) {
-          skip_size = skip_size_org;
-          return GifDecodeStatus::Unfinished;
-        }
-      }
-      break;
-    }
-    case GIF_D_STATUS_EXT_GCE: {
-      GifGraphicControlExtension* gif_gce_ptr = nullptr;
-      if (!ReadData(reinterpret_cast<uint8_t**>(&gif_gce_ptr), 6))
-        return GifDecodeStatus::Unfinished;
-
-      if (!m_GraphicControlExtension.get())
-        m_GraphicControlExtension =
-            pdfium::MakeUnique<GifGraphicControlExtension>();
-      m_GraphicControlExtension->block_size = gif_gce_ptr->block_size;
-      m_GraphicControlExtension->gce_flags = gif_gce_ptr->gce_flags;
-      m_GraphicControlExtension->delay_time = GetWord_LSBFirst(
-          reinterpret_cast<uint8_t*>(&gif_gce_ptr->delay_time));
-      m_GraphicControlExtension->trans_index = gif_gce_ptr->trans_index;
-      break;
-    }
-    default: {
-      if (decode_status == GIF_D_STATUS_EXT_PTE)
-        m_GraphicControlExtension = nullptr;
-      if (!ReadData(&data_size_ptr, 1))
-        return GifDecodeStatus::Unfinished;
-
-      while (*data_size_ptr != GIF_BLOCK_TERMINAL) {
-        if (!ReadData(&data_ptr, *data_size_ptr) ||
-            !ReadData(&data_size_ptr, 1)) {
-          skip_size = skip_size_org;
-          return GifDecodeStatus::Unfinished;
-        }
-      }
-    }
-  }
-  SaveDecodingStatus(GIF_D_STATUS_SIG);
-  return GifDecodeStatus::Success;
-}
-
-GifDecodeStatus CGifContext::DecodeImageInfo() {
-  if (width == 0 || height == 0)
-    return GifDecodeStatus::Error;
-
-  uint32_t skip_size_org = skip_size;
-  GifImageInfo* gif_img_info_ptr = nullptr;
-  if (!ReadData(reinterpret_cast<uint8_t**>(&gif_img_info_ptr), 9))
-    return GifDecodeStatus::Unfinished;
-
-  auto gif_image = pdfium::MakeUnique<GifImage>();
-  gif_image->m_ImageInfo.left =
-      GetWord_LSBFirst(reinterpret_cast<uint8_t*>(&gif_img_info_ptr->left));
-  gif_image->m_ImageInfo.top =
-      GetWord_LSBFirst(reinterpret_cast<uint8_t*>(&gif_img_info_ptr->top));
-  gif_image->m_ImageInfo.width =
-      GetWord_LSBFirst(reinterpret_cast<uint8_t*>(&gif_img_info_ptr->width));
-  gif_image->m_ImageInfo.height =
-      GetWord_LSBFirst(reinterpret_cast<uint8_t*>(&gif_img_info_ptr->height));
-  gif_image->m_ImageInfo.local_flags = gif_img_info_ptr->local_flags;
-  if (gif_image->m_ImageInfo.left + gif_image->m_ImageInfo.width > width ||
-      gif_image->m_ImageInfo.top + gif_image->m_ImageInfo.height > height)
-    return GifDecodeStatus::Error;
-
-  GifLocalFlags* gif_img_info_lf_ptr = &gif_img_info_ptr->local_flags;
-  if (gif_img_info_lf_ptr->local_pal) {
-    gif_image->local_pallette_exp = gif_img_info_lf_ptr->pal_bits;
-    uint32_t loc_pal_size = unsigned(2 << gif_img_info_lf_ptr->pal_bits) * 3u;
-    uint8_t* loc_pal_ptr = nullptr;
-    if (!ReadData(&loc_pal_ptr, loc_pal_size)) {
-      skip_size = skip_size_org;
-      return GifDecodeStatus::Unfinished;
-    }
-
-    gif_image->m_LocalPalettes = std::vector<GifPalette>(loc_pal_size / 3);
-    std::copy(loc_pal_ptr, loc_pal_ptr + loc_pal_size,
-              reinterpret_cast<uint8_t*>(gif_image->m_LocalPalettes.data()));
-  }
-
-  uint8_t* code_size_ptr = nullptr;
-  if (!ReadData(&code_size_ptr, 1)) {
-    skip_size = skip_size_org;
-    return GifDecodeStatus::Unfinished;
-  }
-
-  gif_image->image_code_exp = *code_size_ptr;
-  RecordCurrentPosition(&gif_image->image_data_pos);
-  gif_image->image_data_pos += skip_size;
-  gif_image->m_ImageGCE = nullptr;
-  if (m_GraphicControlExtension.get()) {
-    gif_image->m_ImageGCE = std::move(m_GraphicControlExtension);
-    m_GraphicControlExtension = nullptr;
-  }
-  m_Images.push_back(std::move(gif_image));
-  SaveDecodingStatus(GIF_D_STATUS_IMG_DATA);
-  return GifDecodeStatus::Success;
-}
-
-void CGifContext::DecodingFailureAtTailCleanup(GifImage* gif_image_ptr) {
-  gif_image_ptr->m_ImageRowBuf.clear();
-  SaveDecodingStatus(GIF_D_STATUS_TAIL);
-}
diff --git a/core/fxcodec/lgif/cgifcontext.h b/core/fxcodec/lgif/cgifcontext.h
deleted file mode 100644
index 2573a2e470..0000000000
--- a/core/fxcodec/lgif/cgifcontext.h
+++ /dev/null
@@ -1,76 +0,0 @@
-// 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_LGIF_CGIFCONTEXT_H_
-#define CORE_FXCODEC_LGIF_CGIFCONTEXT_H_
-
-#include <memory>
-#include <vector>
-
-#include "core/fxcodec/codec/ccodec_gifmodule.h"
-#include "core/fxcodec/lgif/cfx_lzwdecoder.h"
-#include "core/fxcodec/lgif/fx_gif.h"
-#include "core/fxcrt/fx_string.h"
-#include "core/fxcrt/unowned_ptr.h"
-
-class CGifContext : public CCodec_GifModule::Context {
- public:
-  CGifContext(CCodec_GifModule* gif_module,
-              CCodec_GifModule::Delegate* pDelegate);
-  ~CGifContext() override;
-
-  void RecordCurrentPosition(uint32_t* cur_pos_ptr);
-  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,
-                         GifPalette* pal_ptr,
-                         int32_t delay_time,
-                         bool user_input,
-                         int32_t trans_index,
-                         int32_t disposal_method,
-                         bool interlace);
-  GifDecodeStatus ReadHeader();
-  GifDecodeStatus GetFrame();
-  GifDecodeStatus LoadFrame(int32_t frame_num);
-  void SetInputBuffer(uint8_t* src_buf, uint32_t src_size);
-  uint32_t GetAvailInput(uint8_t** avail_buf_ptr) const;
-  int32_t GetFrameNum() const;
-
-  UnownedPtr<CCodec_GifModule> m_pModule;
-  UnownedPtr<CCodec_GifModule::Delegate> m_pDelegate;
-  std::vector<GifPalette> m_GlobalPalette;
-  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<GifGraphicControlExtension> m_GraphicControlExtension;
-  uint8_t* next_in;
-  std::vector<std::unique_ptr<GifImage>> m_Images;
-  std::unique_ptr<CFX_LZWDecoder> m_ImgDecoder;
-  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);
-  GifDecodeStatus DecodeExtension();
-  GifDecodeStatus DecodeImageInfo();
-  void DecodingFailureAtTailCleanup(GifImage* gif_image_ptr);
-};
-
-#endif  // CORE_FXCODEC_LGIF_CGIFCONTEXT_H_
diff --git a/core/fxcodec/lgif/fx_gif.cpp b/core/fxcodec/lgif/fx_gif.cpp
deleted file mode 100644
index b8e5cb8994..0000000000
--- a/core/fxcodec/lgif/fx_gif.cpp
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright 2014 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
-
-#include "core/fxcodec/lgif/fx_gif.h"
-
-static_assert(sizeof(GifImageInfo) == 9,
-              "GifImageInfo should have a size of 9");
-static_assert(sizeof(GifPalette) == 3, "GifPalette should have a size of 3");
-static_assert(sizeof(GifPlainTextExtension) == 13,
-              "GifPlainTextExtension should have a size of 13");
-static_assert(sizeof(GifGraphicControlExtension) == 5,
-              "GifGraphicControlExtension should have a size of 5");
-static_assert(sizeof(GifHeader) == 6, "GifHeader should have a size of 6");
-static_assert(sizeof(GifLocalScreenDescriptor) == 7,
-              "GifLocalScreenDescriptor should have a size of 7");
diff --git a/core/fxcodec/lgif/fx_gif.h b/core/fxcodec/lgif/fx_gif.h
deleted file mode 100644
index 08a64c8326..0000000000
--- a/core/fxcodec/lgif/fx_gif.h
+++ /dev/null
@@ -1,131 +0,0 @@
-// Copyright 2014 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_LGIF_FX_GIF_H_
-#define CORE_FXCODEC_LGIF_FX_GIF_H_
-
-#include <memory>
-#include <vector>
-
-class CGifContext;
-
-#define GIF_SIGNATURE "GIF"
-#define GIF_SIG_EXTENSION 0x21
-#define GIF_SIG_IMAGE 0x2C
-#define GIF_SIG_TRAILER 0x3B
-#define GIF_BLOCK_GCE 0xF9
-#define GIF_BLOCK_PTE 0x01
-#define GIF_BLOCK_CE 0xFE
-#define GIF_BLOCK_AE 0xFF
-#define GIF_BLOCK_TERMINAL 0x00
-#define GIF_MAX_LZW_EXP 12
-#define GIF_MAX_LZW_CODE 4096
-#define GIF_DATA_BLOCK 255
-#define GIF_MAX_ERROR_SIZE 256
-#define GIF_D_STATUS_SIG 0x01
-#define GIF_D_STATUS_TAIL 0x02
-#define GIF_D_STATUS_EXT 0x03
-#define GIF_D_STATUS_EXT_AE 0x04
-#define GIF_D_STATUS_EXT_CE 0x05
-#define GIF_D_STATUS_EXT_GCE 0x06
-#define GIF_D_STATUS_EXT_PTE 0x07
-#define GIF_D_STATUS_EXT_UNE 0x08
-#define GIF_D_STATUS_IMG_INFO 0x09
-#define GIF_D_STATUS_IMG_DATA 0x0A
-
-#pragma pack(1)
-typedef struct {
-  uint8_t pal_bits : 3;
-  uint8_t sort_flag : 1;
-  uint8_t color_resolution : 3;
-  uint8_t global_pal : 1;
-} GifGlobalFlags;
-
-typedef struct {
-  uint8_t pal_bits : 3;
-  uint8_t reserved : 2;
-  uint8_t sort_flag : 1;
-  uint8_t interlace : 1;
-  uint8_t local_pal : 1;
-} GifLocalFlags;
-
-typedef struct {
-  char signature[3];
-  char version[3];
-} GifHeader;
-
-typedef struct {
-  uint16_t width;
-  uint16_t height;
-  GifGlobalFlags global_flags;
-  uint8_t bc_index;
-  uint8_t pixel_aspect;
-} GifLocalScreenDescriptor;
-
-typedef struct {
-  uint16_t left;
-  uint16_t top;
-  uint16_t width;
-  uint16_t height;
-  GifLocalFlags local_flags;
-} GifImageInfo;
-
-typedef struct {
-  uint8_t transparency : 1;
-  uint8_t user_input : 1;
-  uint8_t disposal_method : 3;
-  uint8_t reserved : 3;
-} GifControlExtensionFlags;
-
-typedef struct {
-  uint8_t block_size;
-  GifControlExtensionFlags gce_flags;
-  uint16_t delay_time;
-  uint8_t trans_index;
-} GifGraphicControlExtension;
-
-typedef struct {
-  uint8_t block_size;
-  uint16_t grid_left;
-  uint16_t grid_top;
-  uint16_t grid_width;
-  uint16_t grid_height;
-
-  uint8_t char_width;
-  uint8_t char_height;
-
-  uint8_t fc_index;
-  uint8_t bc_index;
-} GifPlainTextExtension;
-
-typedef struct {
-  uint8_t block_size;
-  uint8_t app_identify[8];
-  uint8_t app_authentication[3];
-} GifApplicationExtension;
-
-typedef struct { uint8_t r, g, b; } GifPalette;
-#pragma pack()
-
-enum class GifDecodeStatus {
-  Error,
-  Success,
-  Unfinished,
-  InsufficientDestSize,  // Only used internally by CGifLZWDecoder::Decode()
-};
-
-typedef struct {
-  std::unique_ptr<GifGraphicControlExtension> m_ImageGCE;
-  std::vector<GifPalette> m_LocalPalettes;
-  std::vector<uint8_t> m_ImageRowBuf;
-  GifImageInfo m_ImageInfo;
-  uint8_t local_pallette_exp;
-  uint8_t image_code_exp;
-  uint32_t image_data_pos;
-  int32_t image_row_num;
-} GifImage;
-
-#endif  // CORE_FXCODEC_LGIF_FX_GIF_H_