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query_sixel: support alacritty's ugh decisions #1430

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nick black 2021-04-04 05:37:19 -04:00
parent 0c2e3d6e35
commit 7865539505
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GPG Key ID: 5F43400C21CBFACC
1 changed files with 25 additions and 8 deletions
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33
src/lib/terminfo.c
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@ -305,6 +305,17 @@ query_sixel_details(tinfo* ti, int fd){
return 0; return 0;
} }
// we found Sixel support -- set up the API
static void
setup_sixel(tinfo* ti, int (**pixel_init)(int fd)){
ti->sixel_supported = true;
ti->color_registers = 256; // assumed default [shrug]
*pixel_init = ti->pixel_init = sprite_sixel_init;
ti->pixel_draw = sixel_draw;
ti->sixel_maxx = ti->sixel_maxy = 0;
ti->pixel_destroy = sixel_delete;
}
// query for Sixel support // query for Sixel support
static int static int
query_sixel(tinfo* ti, int fd){ query_sixel(tinfo* ti, int fd){
@ -320,8 +331,12 @@ query_sixel(tinfo* ti, int fd){
WANT_QMARK, WANT_QMARK,
WANT_SEMI, WANT_SEMI,
WANT_C, WANT_C,
WANT_C_ALACRITTY_HACK,
DONE DONE
} state = WANT_CSI; } state = WANT_CSI;
// we're looking for a 4 following a semicolon, or alacritty's insistence
// on CSI 6c followed by XTSMGRAPHICS, which probably breaks us on a real
// VT102, but how many of them could there be? le sigh FIXME
while(read(fd, &in, 1) == 1){ while(read(fd, &in, 1) == 1){
switch(state){ switch(state){
case WANT_CSI: case WANT_CSI:
@ -339,20 +354,22 @@ query_sixel(tinfo* ti, int fd){
state = WANT_C; state = WANT_C;
}else if(in == 'c'){ }else if(in == 'c'){
state = DONE; state = DONE;
}else if(in == '6'){
state = WANT_C_ALACRITTY_HACK;
} }
break; break;
case WANT_C: case WANT_C:
if(in == 'c'){ if(in == 'c'){
state = DONE; state = DONE;
}else if(in == '4'){ }else if(in == '4'){
if(!ti->sixel_supported){ setup_sixel(ti, &pixel_init);
ti->sixel_supported = true; state = DONE;
ti->color_registers = 256; // assumed default [shrug] }
pixel_init = ti->pixel_init = sprite_sixel_init; break;
ti->pixel_draw = sixel_draw; case WANT_C_ALACRITTY_HACK:
ti->sixel_maxx = ti->sixel_maxy = 0; if(in == 'c'){
ti->pixel_destroy = sixel_delete; setup_sixel(ti, &pixel_init);
} state = DONE;
} }
break; break;
case DONE: case DONE: