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[sixel] cut actionmap from a byte per to a bit #2573

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nick black 2022-01-25 16:21:21 -05:00 committed by nick black
parent 1c52377e08
commit d73f89e9a1
1 changed files with 20 additions and 3 deletions
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23
src/lib/sixel.c
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@ -674,6 +674,19 @@ load_color_table(const qstate* qs, uint32_t colors, unsigned char* table){
assert(loaded == colors);
}
// get the byte in the actionmap corresponding to a color + sixelrow
static inline unsigned
actionmap_offset(int cidx, int colors, int sixelrow){
return (sixelrow * colors + cidx) / 8;
}
// get the bit in the actionmap corresponding to a color + sixelrow.
// bytes in the actionmap are little-endian: 76543210fedcba98...
static inline unsigned
actionmap_bit(int cidx, int colors, int sixelrow){
return 1u << ((sixelrow * colors + cidx) % 8);
}
// we have converged upon colorregs in the octree. we now run over the pixels
// once again, and get the actual final color table entries.
static inline int
@ -702,9 +715,11 @@ build_data_table(qstate* qs, uint32_t colors, sixeltable* stab, const uint32_t*
stab->map->colors = colors;
int pos = 0;
//fprintf(stderr, "BUILDING DATA TABLE\n");
size_t actionsize = colors * (leny + 5) / 6; // using a byte per, could use bit
// 1 bit per color per sixelrow as a skiptable; if 0, color is absent there
size_t actionsize = ((colors * (leny + 5) / 6) + (CHAR_BIT - 1)) / CHAR_BIT;
stab->map->action = malloc(actionsize);
memset(stab->map->action, 0, actionsize);
int sixelrow = 0;
for(int visy = begy ; visy < (begy + leny) ; visy += 6){ // pixel row
for(int visx = begx ; visx < (begx + lenx) ; visx += 1){ // pixel column
for(int sy = visy ; sy < (begy + leny) && sy < visy + 6 ; ++sy){ // offset within sprixel
@ -721,10 +736,12 @@ build_data_table(qstate* qs, uint32_t colors, sixeltable* stab, const uint32_t*
return -1;
}
stab->map->data[cidx * stab->map->sixelcount + pos] |= (1u << (sy - visy));
stab->map->action[colors * (visy - begy) / 6 + cidx] = 1;
stab->map->action[actionmap_offset(cidx, colors, sixelrow)] |=
actionmap_bit(cidx, colors, sixelrow);
}
++pos;
}
++sixelrow;
}
return 0;
}
@ -993,7 +1010,7 @@ write_sixel_payload(fbuf* f, int lenx, const sixelmap* map){
while(p < map->sixelcount){
int needclosure = 0;
for(int i = 0 ; i < map->colors ; ++i){
if(!map->action[sixelrow * map->colors + i]){
if(!(map->action[actionmap_offset(i, map->colors, sixelrow)] & actionmap_bit(i, map->colors, sixelrow))){
continue;
}
int seenrle = 0; // number of repetitions