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kitty: get graphics protocol syntactic #1095

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nick black 2021-03-08 23:10:00 -05:00 committed by Nick Black
parent 26d2ad8e7b
commit 3818f0b31f
1 changed files with 35 additions and 13 deletions
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46
src/lib/kitty.c
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@ -1,33 +1,54 @@
#include "internal.h"
static unsigned const char b64subs[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
// we can only write 4KiB at a time
static int
write_kitty_data(FILE* fp, int linesize, int leny, int lenx, const uint32_t* data){
#define KITTY_MAXLEN 4096 // 4096B maximum payload
if(linesize % sizeof(*data)){
return -1;
}
// FIXME must write m=1 for initial chunks, m=0 for final (assuming > 1)
fprintf(fp, "\e_Gf=24,s=%d,v=%d;", lenx, leny);
// FIXME need to base64 encode payload. each 3B RGB goes to a 4B base64
for(int y = 0 ; y < leny ; ++y){
int total = leny * lenx * 4; // 3B RGB -> 4B Base64, total bytes
int chunks = (total + (KITTY_MAXLEN - 1)) / KITTY_MAXLEN;
int totalout = 0; // total bytes of payload out
int y = 0;
int x = 0;
int targetout = 0;
//fprintf(stderr, "total: %d chunks = %d, s=%d,v=%d\n", total, chunks, lenx, leny);
while(chunks--){
if(totalout == 0){
fprintf(fp, "\e_Gf=24,s=%d,v=%d,a=T%s;", lenx, leny, chunks > 1 ? ",m=1" : "");
}else{
fprintf(fp, "\e_Gm=%d;", chunks ? 1 : 0);
}
if((targetout += KITTY_MAXLEN) > total){
targetout = total;
}
while(totalout < targetout){
if(x == lenx){
x = 0;
++y;
}
const uint32_t* line = data + (linesize / sizeof(*data)) * y;
for(int x = 0 ; x < lenx ; ++x){
uint32_t pixel = line[x];
unsigned r = ncpixel_r(pixel);
unsigned g = ncpixel_g(pixel);
unsigned b = ncpixel_b(pixel);
unsigned char b64[4] = {
((r & 0xfc) >> 2) + 'A',
((r & 0x3 << 2) | ((g & 0xf0) >> 4)) + 'A',
(((g & 0xf) << 2) | ((b & 0xc0) >> 6)) + 'A',
(b & 0x3f) + 'A'
b64subs[((r & 0xfc) >> 2)],
b64subs[((r & 0x3 << 2) | ((g & 0xf0) >> 4))],
b64subs[(((g & 0xf) << 2) | ((b & 0xc0) >> 6))],
b64subs[(b & 0x3f)]
};
// this isn't the correct base64 distribution FIXME
fprintf(stderr, "%u/%u/%u -> %c%c%c%c %u %u %u %u\n", r, g, b, b64[0], b64[1], b64[2], b64[3], b64[0], b64[1], b64[2], b64[3]);
//fprintf(stderr, "%u/%u/%u -> %c%c%c%c %u %u %u %u\n", r, g, b, b64[0], b64[1], b64[2], b64[3], b64[0], b64[1], b64[2], b64[3]);
fprintf(fp, "%c%c%c%c", b64[0], b64[1], b64[2], b64[3]);
}
totalout += 4;
++x;
}
fprintf(fp, "\e\\");
}
if(fclose(fp) == EOF){
return -1;
}
@ -65,6 +86,7 @@ int kitty_blit(ncplane* nc, int placey, int placex, int linesize,
int leny, int lenx, unsigned cellpixx){
(void)begy;
(void)begx;
//fprintf(stderr, "s=%d,v=%d\n", lenx, leny);
int r = kitty_blit_inner(nc, placey, placex, linesize, leny, lenx, cellpixx, data);
if(r < 0){
return -1;