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
|
/*
* Copyright © 2016-2020 Hayaki Saito
* Copyright © 2020 Hans Petter Jansson
* originally written by kmiya@cluti (https://github.com/saitoha/sixel/blob/master/fromsixel.c)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include <stdint.h>
#define DECSIXEL_PARAMS_MAX 16
#define DECSIXEL_PALETTE_MAX 1024
#define DECSIXEL_PARAMVALUE_MAX 65535
#define DECSIXEL_WIDTH_MAX 4096
#define DECSIXEL_HEIGHT_MAX 4096
typedef unsigned short sixel_color_no_t;
typedef struct sixel_image_buffer {
sixel_color_no_t *data;
int width;
int height;
int palette[DECSIXEL_PALETTE_MAX];
sixel_color_no_t ncolors;
int palette_modified;
int use_private_register;
} sixel_image_t;
typedef enum parse_state {
DECSIXEL_PS_ESC = 1, /* ESC */
DECSIXEL_PS_DECSIXEL, /* DECSIXEL body part ", $, -, ? ... ~ */
DECSIXEL_PS_DECGRA, /* DECGRA Set Raster Attributes " Pan; Pad; Ph; Pv */
DECSIXEL_PS_DECGRI, /* DECGRI Graphics Repeat Introducer ! Pn Ch */
DECSIXEL_PS_DECGCI, /* DECGCI Graphics Color Introducer # Pc; Pu; Px; Py; Pz */
} parse_state_t;
typedef struct parser_context {
parse_state_t state;
int pos_x;
int pos_y;
int max_x;
int max_y;
/* Pixel aspect ratio; unused */
int attributed_pan;
int attributed_pad;
int attributed_ph;
int attributed_pv;
int repeat_count;
int color_index;
int bgindex;
int param;
int nparams;
int params[DECSIXEL_PARAMS_MAX];
sixel_image_t image;
} sixel_state_t;
int sixel_parser_init(sixel_state_t *st, int fgcolor, int bgcolor, int use_private_register);
int sixel_parser_feed(sixel_state_t *st, const uint32_t *p, size_t len);
int sixel_parser_set_default_color(sixel_state_t *st);
int sixel_parser_finalize(sixel_state_t *st, unsigned char *pixels);
void sixel_parser_deinit(sixel_state_t *st);
|
