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sixel: add support for fully transparent bg (P2=1) (#132)

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P2 selects how the terminal draws the background color.

P2                  Meaning
0 or 2 (default)    Pixel positions specified as 0 are set to the
                    current background color.
1                   Pixel positions specified as 0 remain at their
                    current color.

Both modes are now supported.

Ref. https://www.vt100.net/docs/vt3xx-gp/chapter14.html
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veltza 2024-04-17 19:04:27 +03:00 • committed by GitHub
parent dd8675943d
commit 118e965d0c
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6 changed files with 85 additions and 33 deletions
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4
sixel.h
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@ -39,6 +39,7 @@ typedef struct parser_context {
int attributed_pad;
int attributed_ph;
int attributed_pv;
int transparent;
int repeat_count;
int color_index;
int bgindex;
@ -52,10 +53,11 @@ typedef struct parser_context {
void scroll_images(int n);
void delete_image(ImageList *im);
int sixel_parser_init(sixel_state_t *st, sixel_color_t fgcolor, sixel_color_t bgcolor, unsigned char use_private_register, int cell_width, int cell_height);
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