summaryrefslogtreecommitdiff
path: root/core/fxcodec/lgif
diff options
context:
space:
mode:
Diffstat (limited to 'core/fxcodec/lgif')
-rw-r--r--core/fxcodec/lgif/cfx_lzwdecoder.cpp184
-rw-r--r--core/fxcodec/lgif/cfx_lzwdecoder.h55
-rw-r--r--core/fxcodec/lgif/cfx_lzwdecoder_unittest.cpp147
-rw-r--r--core/fxcodec/lgif/cgifcontext.cpp549
-rw-r--r--core/fxcodec/lgif/cgifcontext.h76
-rw-r--r--core/fxcodec/lgif/fx_gif.cpp18
-rw-r--r--core/fxcodec/lgif/fx_gif.h131
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_
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 00:42:54 +0000