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// 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/codec/cfx_codec_memory.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"
#include "third_party/base/span.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(pdfium::span<uint8_t> src_buf);
uint32_t GetAvailInput() const;
size_t GetFrameNum() const { return images_.size(); }
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_;
int32_t decode_status_;
std::unique_ptr<CFX_GifGraphicControlExtension> graphic_control_extension_;
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_;
protected:
bool ReadAllOrNone(uint8_t* dest, uint32_t size);
CFX_GifDecodeStatus ReadGifSignature();
CFX_GifDecodeStatus ReadLogicalScreenDescriptor();
RetainPtr<CFX_CodecMemory> input_buffer_;
private:
void SaveDecodingStatus(int32_t status);
CFX_GifDecodeStatus DecodeExtension();
CFX_GifDecodeStatus DecodeImageInfo();
void DecodingFailureAtTailCleanup(CFX_GifImage* gif_image);
bool ScanForTerminalMarker();
};
#endif // CORE_FXCODEC_GIF_CFX_GIFCONTEXT_H_
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