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Add sixel support

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Originated from https://gist.github.com/CommandMaker/27ba97427424c06aff54d0a2a91a4ef1
This commit is contained in:
Aaron Lindsay
2025-07-29 10:17:35 -04:00
parent f114bcedd1
commit 8430e5c5ec
10 changed files with 1835 additions and 399 deletions
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63
sixel.h Normal file
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#ifndef SIXEL_H
#define SIXEL_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 unsigned int sixel_color_t;
typedef struct sixel_image_buffer {
sixel_color_no_t *data;
int width;
int height;
sixel_color_t palette[DECSIXEL_PALETTE_MAX];
sixel_color_no_t ncolors;
int palette_modified;
int use_private_register;
} sixel_image_t;
typedef enum parse_state {
PS_ESC = 1, /* ESC */
PS_DECSIXEL = 2, /* DECSIXEL body part ", $, -, ? ... ~ */
PS_DECGRA = 3, /* DECGRA Set Raster Attributes " Pan; Pad; Ph; Pv */
PS_DECGRI = 4, /* DECGRI Graphics Repeat Introducer ! Pn Ch */
PS_DECGCI = 5, /* DECGCI Graphics Color Introducer # Pc; Pu; Px; Py; Pz */
PS_ERROR = 6,
} parse_state_t;
typedef struct parser_context {
parse_state_t state;
int pos_x;
int pos_y;
int max_x;
int max_y;
int attributed_pan;
int attributed_pad;
int attributed_ph;
int attributed_pv;
int transparent;
int repeat_count;
int color_index;
int bgindex;
int grid_width;
int grid_height;
int param;
int nparams;
int params[DECSIXEL_PARAMS_MAX];
sixel_image_t image;
} sixel_state_t;
void scroll_images(int n);
void delete_image(ImageList *im);
int sixel_parser_init(sixel_state_t *st, int transparent, sixel_color_t fgcolor, sixel_color_t bgcolor, unsigned char use_private_register, int cell_width, int cell_height);
int sixel_parser_parse(sixel_state_t *st, const unsigned char *p, size_t len);
int sixel_parser_set_default_color(sixel_state_t *st);
int sixel_parser_finalize(sixel_state_t *st, ImageList **newimages, int cx, int cy, int cw, int ch);
void sixel_parser_deinit(sixel_state_t *st);
Pixmap sixel_create_clipmask(char *pixels, int width, int height);
#endif