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sexblitter: set full cells

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pull/1085/head
nick black 4 years ago committed by Nick Black
parent 591d14eff7
commit 8f4fa930f1
1 changed files with 42 additions and 27 deletions
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69
src/lib/blit.c
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@ -479,15 +479,20 @@ strans_fold(unsigned* bitstring, unsigned bit, const uint8_t* rgba, bool bgr,
}
// if neither bit is present in the bitstring, store the sum of the absolute
// component differences into *diff. otherwise, set *diff to UINT_MAX.
static inline void
// component differences into *diff. otherwise, set *diff to UINT_MAX. returns
// true if neither pixel was transparent, and their components were equal.
static inline bool
collect_diffs(unsigned* diff, unsigned bitstring, const uint8_t* rgba1,
unsigned bit1, const uint8_t* rgba2, unsigned bit2){
if((bitstring & (bit1 | bit2)) == 0){
*diff = rgb_diff(rgba1[0], rgba1[1], rgba1[2], rgba2[0], rgba2[1], rgba2[2]);
if(!*diff){
return true;
}
}else{
*diff = UINT_MAX;
}
return false;
}
// sextant check for transparency. returns an EGC if we found transparent pixels
@ -495,9 +500,11 @@ collect_diffs(unsigned* diff, unsigned bitstring, const uint8_t* rgba1,
// returns NULL otherwise. transparency trumps everything else in terms of
// priority -- if even one pixel is transparent, we will have a transparent
// background, and lerp the rest together for foreground. we thus have a 32-way
// conditional tree in which each EGC must show up exactly once.
// conditional tree in which each EGC must show up exactly once. this also
// handles the opaque case where all six pixels are the same, emitting a space
// with both foreground and background set to that color.
static inline const char*
strans_check(cell* c, bool bgr, bool blendcolors,
strans_check(uint64_t* channels, bool bgr, bool blendcolors, unsigned diffs[15],
const uint8_t* rgbbase_l1, const uint8_t* rgbbase_r1,
const uint8_t* rgbbase_l2, const uint8_t* rgbbase_r2,
const uint8_t* rgbbase_l3, const uint8_t* rgbbase_r3){
@ -508,48 +515,52 @@ strans_check(cell* c, bool bgr, bool blendcolors,
// r2 - l3, r2 - r3
// l3 - r3
// if either pixel is transparent, the difference is UINT_MAX
unsigned diffs[15];
unsigned bitstring = 0;
unsigned div = 0;
unsigned r, g, b;
r = g = b = 0;
bool allzerodiffs = true;
strans_fold(&bitstring, 1u, rgbbase_l1, bgr, &r, &g, &b, &div);
strans_fold(&bitstring, 2u, rgbbase_r1, bgr, &r, &g, &b, &div);
collect_diffs(&diffs[0], bitstring, rgbbase_r1, 2u, rgbbase_l1, 1u);
allzerodiffs &= collect_diffs(&diffs[0], bitstring, rgbbase_r1, 2u, rgbbase_l1, 1u);
strans_fold(&bitstring, 4u, rgbbase_l2, bgr, &r, &g, &b, &div);
collect_diffs(&diffs[1], bitstring, rgbbase_l2, 4u, rgbbase_l1, 1u);
collect_diffs(&diffs[5], bitstring, rgbbase_l2, 4u, rgbbase_r1, 2u);
allzerodiffs &= collect_diffs(&diffs[1], bitstring, rgbbase_l2, 4u, rgbbase_l1, 1u);
allzerodiffs &= collect_diffs(&diffs[5], bitstring, rgbbase_l2, 4u, rgbbase_r1, 2u);
strans_fold(&bitstring, 8u, rgbbase_r2, bgr, &r, &g, &b, &div);
collect_diffs(&diffs[2], bitstring, rgbbase_r2, 8u, rgbbase_l1, 1u);
collect_diffs(&diffs[6], bitstring, rgbbase_r2, 8u, rgbbase_r1, 2u);
collect_diffs(&diffs[9], bitstring, rgbbase_r2, 8u, rgbbase_l1, 4u);
allzerodiffs &= collect_diffs(&diffs[2], bitstring, rgbbase_r2, 8u, rgbbase_l1, 1u);
allzerodiffs &= collect_diffs(&diffs[6], bitstring, rgbbase_r2, 8u, rgbbase_r1, 2u);
allzerodiffs &= collect_diffs(&diffs[9], bitstring, rgbbase_r2, 8u, rgbbase_l1, 4u);
strans_fold(&bitstring, 16u, rgbbase_l3, bgr, &r, &g, &b, &div);
collect_diffs(&diffs[3], bitstring, rgbbase_l3, 16u, rgbbase_l1, 1u);
collect_diffs(&diffs[7], bitstring, rgbbase_l3, 16u, rgbbase_r1, 2u);
collect_diffs(&diffs[9], bitstring, rgbbase_l3, 16u, rgbbase_l2, 4u);
collect_diffs(&diffs[12], bitstring, rgbbase_l3, 16u, rgbbase_r2, 8u);
allzerodiffs &= collect_diffs(&diffs[3], bitstring, rgbbase_l3, 16u, rgbbase_l1, 1u);
allzerodiffs &= collect_diffs(&diffs[7], bitstring, rgbbase_l3, 16u, rgbbase_r1, 2u);
allzerodiffs &= collect_diffs(&diffs[9], bitstring, rgbbase_l3, 16u, rgbbase_l2, 4u);
allzerodiffs &= collect_diffs(&diffs[12], bitstring, rgbbase_l3, 16u, rgbbase_r2, 8u);
strans_fold(&bitstring, 32u, rgbbase_r3, bgr, &r, &g, &b, &div);
collect_diffs(&diffs[4], bitstring, rgbbase_r3, 32u, rgbbase_l1, 1u);
collect_diffs(&diffs[8], bitstring, rgbbase_r3, 32u, rgbbase_r1, 2u);
collect_diffs(&diffs[10], bitstring, rgbbase_r3, 32u, rgbbase_l2, 4u);
collect_diffs(&diffs[11], bitstring, rgbbase_r3, 32u, rgbbase_r2, 8u);
collect_diffs(&diffs[13], bitstring, rgbbase_r3, 32u, rgbbase_l3, 16u);
if(!bitstring){ // no transparent pixels, use main solver
allzerodiffs &= collect_diffs(&diffs[4], bitstring, rgbbase_r3, 32u, rgbbase_l1, 1u);
allzerodiffs &= collect_diffs(&diffs[8], bitstring, rgbbase_r3, 32u, rgbbase_r1, 2u);
allzerodiffs &= collect_diffs(&diffs[10], bitstring, rgbbase_r3, 32u, rgbbase_l2, 4u);
allzerodiffs &= collect_diffs(&diffs[11], bitstring, rgbbase_r3, 32u, rgbbase_r2, 8u);
allzerodiffs &= collect_diffs(&diffs[13], bitstring, rgbbase_r3, 32u, rgbbase_l3, 16u);
if(!bitstring){ // no transparent pixels, use main solver unless all are same
if(allzerodiffs){
channels_set_bg_rgb8(channels, r / div, g / div, b / div);
return " ";
}
return NULL;
}
// there were some transparent pixels. since they get priority, the foreground
// is just a general lerp across non-transparent pixels.
const char* egc = sex[bitstring];
cell_set_bg_alpha(c, CELL_ALPHA_TRANSPARENT);
channels_set_bg_alpha(channels, CELL_ALPHA_TRANSPARENT);
//fprintf(stderr, "bitstring: %u egcp: %p egc: %s\n", bitstring, egc, egc ? egc : "null");
if(*egc == ' '){ // entirely transparent
cell_set_fg_alpha(c, CELL_ALPHA_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);
cell_set_fg_rgb8(c, r / div, g / div, b / div);
channels_set_fg_rgb8(channels, r / div, g / div, b / div);
if(blendcolors){
cell_set_fg_alpha(c, CELL_ALPHA_BLEND);
channels_set_fg_alpha(channels, CELL_ALPHA_BLEND);
}
}
return egc;
@ -602,9 +613,13 @@ 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 = strans_check(c, bgr, blendcolors, rgbbase_l1, rgbbase_r1,
rgbbase_l2, rgbbase_r2, rgbbase_l3, rgbbase_r3);
unsigned diffs[15];
const char* egc = strans_check(&c->channels, bgr, blendcolors, diffs,
rgbbase_l1, rgbbase_r1, rgbbase_l2,
rgbbase_r2, rgbbase_l3, rgbbase_r3);
if(egc == NULL){
// no transparent pixels. solve for EGC + colors using the 15 absolute
// rgba differences in |diffs|
egc = "*"; // FIXME
}
if(*egc && pool_blit_direct(&nc->pool, c, egc, strlen(egc), 1) <= 0){

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