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sexblitter: restore transparency #1089

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nick black 2020-10-31 18:03:01 -04:00
parent 13a9b38390
commit 8548cdc780
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1 changed files with 60 additions and 12 deletions
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72
src/lib/blit.c
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@ -444,17 +444,6 @@ quadrant_blit(ncplane* nc, int placey, int placex, int linesize,
return total;
}
static const char* sex[64] = {
" ", "🬀", "🬁", "🬃", "🬇", "🬏", "🬞", "🬂",
"🬄", "🬈", "🬐", "🬟", "🬅", "🬉", "🬑", "🬠",
"🬋", "🬓", "🬢", "🬖", "🬦", "🬭", "🬆", "🬊",
"🬒", "🬡", "🬌", "▌", "🬣", "🬗", "🬧", "🬍",
"█", "🬻", "🬺", "🬸", "🬴", "🬬", "🬝", "🬹",
"🬷", "🬳", "🬫", "🬜", "🬶", "🬲", "🬪", "🬛",
"🬰", "🬨", "🬙", "🬥", "🬕", "🬎", "🬵", "🬱",
"🬩", "🬚", "🬯", "▐", "🬘", "🬤", "🬔", "🬮",
};
// take a sum over channels, and the sample count, write back lerped channel
static inline uint32_t
generalerp(unsigned rsum, unsigned gsum, unsigned bsum, int count){
@ -476,6 +465,16 @@ generalerp(unsigned rsum, unsigned gsum, unsigned bsum, int count){
// of pixels that minimizes total source distance from the resulting lerps.
static const char*
sex_solver(const uint32_t rgbas[6], uint64_t* channels, bool blendcolors){
static const char* sex[64] = {
" ", "🬀", "🬁", "🬃", "🬇", "🬏", "🬞", "🬂",
"🬄", "🬈", "🬐", "🬟", "🬅", "🬉", "🬑", "🬠",
"🬋", "🬓", "🬢", "🬖", "🬦", "🬭", "🬆", "🬊",
"🬒", "🬡", "🬌", "▌", "🬣", "🬗", "🬧", "🬍",
"█", "🬻", "🬺", "🬸", "🬴", "🬬", "🬝", "🬹",
"🬷", "🬳", "🬫", "🬜", "🬶", "🬲", "🬪", "🬛",
"🬰", "🬨", "🬙", "🬥", "🬕", "🬎", "🬵", "🬱",
"🬩", "🬚", "🬯", "▐", "🬘", "🬤", "🬔", "🬮",
};
// each element within the set of 64 has an inverse element within the set,
// for which we will calculate the same total differences, so just handle the
// first 32, and then assign fg to whichever cluster is larger.
@ -544,6 +543,52 @@ sex_solver(const uint32_t rgbas[6], uint64_t* channels, bool blendcolors){
return sex[best];
}
static const char*
sex_trans_check(const uint32_t rgbas[6], uint64_t* channels, bool blendcolors){
static const char* sex[64] = {
"█", "🬻", "🬺", "🬹", "🬸", "🬷", "🬶", "🬵", "🬴", "🬳", "🬲", // 10
"🬱", "🬰", "🬯", "🬮", "🬭", "🬬", "🬫", "🬪", "🬩", "🬨", "▐", // 21
"🬧", "🬦", "🬥", "🬤", "🬣", "🬢", "🬡", "🬠", "🬟", // 30
"🬞", "🬝", "🬜", "🬛", "🬚", "🬙", "🬘", "🬗", "🬖", "🬕", // 40
"🬔", "▌", "🬓", "🬒", "🬑", "🬐", "🬏", "🬎", "🬍", "🬌", // 50
"🬋", "🬊", "🬉", "🬈", "🬇", "🬆", "🬅", "🬄", "🬃", "🬂", // 60
"🬁", "🬀", " ",
};
unsigned transstring = 0;
unsigned r = 0, g = 0, b = 0;
unsigned div = 0;
for(unsigned mask = 0 ; mask < 6 ; ++mask){
if(ffmpeg_trans_p(ncpixel_a(rgbas[mask]))){
transstring |= (1u << mask);
}else{
r += ncpixel_r(rgbas[mask]);
g += ncpixel_g(rgbas[mask]);
b += ncpixel_b(rgbas[mask]);
++div;
}
}
if(transstring == 0){
return NULL;
}
channels_set_bg_alpha(channels, CELL_ALPHA_TRANSPARENT);
// there were some transparent pixels. since they get priority, the foreground
// is just a general lerp across non-transparent pixels.
const char* egc = sex[transstring];
channels_set_bg_alpha(channels, CELL_ALPHA_TRANSPARENT);
//fprintf(stderr, "transtring: %u egc: %s\n", transtring, egc);
if(*egc == ' '){ // entirely transparent
channels_set_fg_alpha(channels, CELL_ALPHA_TRANSPARENT);
return "";
}else{ // partially transparent, thus div >= 1
//fprintf(stderr, "div: %u r: %u g: %u b: %u\n", div, r, g, b);
channels_set_fchannel(channels, generalerp(r, g, b, div));
if(blendcolors){
channels_set_fg_alpha(channels, CELL_ALPHA_BLEND);
}
}
return egc;
}
// sextant blitter. maps 3x2 to each cell. since we only have two colors at
// our disposal (foreground and background), we lose some fidelity.
static inline int
@ -583,7 +628,10 @@ sextant_blit(ncplane* nc, int placey, int placex, int linesize,
cell* c = ncplane_cell_ref_yx(nc, y, x);
c->channels = 0;
c->stylemask = 0;
const char* egc = sex_solver(rgbas, &c->channels, blendcolors);
const char* egc = sex_trans_check(rgbas, &c->channels, blendcolors);
if(egc == NULL){
egc = sex_solver(rgbas, &c->channels, blendcolors);
}
//fprintf(stderr, "sex EGC: %s channels: %016lx\n", egc, c->channels);
if(*egc){
if(pool_blit_direct(&nc->pool, c, egc, strlen(egc), 1) <= 0){