1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
// 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 AddError(const char* err_msg);
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;
char m_szLastError[GIF_MAX_ERROR_SIZE];
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_
|
