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move fill/stain routines into fill.c

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nick black 2020-02-29 15:50:29 -05:00
parent a39efb1d6d
commit 1030409096
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GPG Key ID: 5F43400C21CBFACC
2 changed files with 19 additions and 310 deletions
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19
src/lib/internal.h
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@ -428,6 +428,25 @@ rgb_quantize_8(unsigned r, unsigned g, unsigned b){
return WHITE;
}
// Given r, g, and b values 0..255, do a weighted average per Rec. 601, and
// return the 8-bit greyscale value (this value will be the r, g, and b value
// for the new color).
static inline int
rgb_greyscale(int r, int g, int b){
if(r < 0 || r > 255){
return -1;
}
if(g < 0 || g > 255){
return -1;
}
if(b < 0 || b > 255){
return -1;
}
// Use Rec. 601 scaling plus linear approximation of gamma decompression
float fg = (0.299 * (r / 255.0) + 0.587 * (g / 255.0) + 0.114 * (b / 255.0));
return fg * 255;
}
static inline int
term_emit(const char* name __attribute__ ((unused)), const char* seq,
FILE* out, bool flush){

310
src/lib/notcurses.c
View File

@ -1895,316 +1895,6 @@ void palette256_free(palette256* p){
free(p);
}
// Given r, g, and b values 0..255, do a weighted average per Rec. 601, and
// return the 8-bit greyscale value (this value will be the r, g, and b value
// for the new color).
static inline int
rgb_greyscale(int r, int g, int b){
if(r < 0 || r > 255){
return -1;
}
if(g < 0 || g > 255){
return -1;
}
if(b < 0 || b > 255){
return -1;
}
// Use Rec. 601 scaling plus linear approximation of gamma decompression
float fg = (0.299 * (r / 255.0) + 0.587 * (g / 255.0) + 0.114 * (b / 255.0));
return fg * 255;
}
void ncplane_greyscale(ncplane *n){
for(int y = 0 ; y < n->leny ; ++y){
for(int x = 0 ; x < n->lenx ; ++x){
cell* c = &n->fb[nfbcellidx(n, y, x)];
unsigned r, g, b;
cell_fg_rgb(c, &r, &g, &b);
int gy = rgb_greyscale(r, g, b);
cell_set_fg_rgb(c, gy, gy, gy);
cell_bg_rgb(c, &r, &g, &b);
gy = rgb_greyscale(r, g, b);
cell_set_bg_rgb(c, gy, gy, gy);
}
}
}
// if this is not polyfillable cell, we return 0. if it is, we attempt to fill
// it, then recurse out. return -1 on error, or number of cells filled on
// success. so a return of 0 means there's no work to be done here, and N means
// we did some work here, filling everything we could reach. out-of-plane is 0.
static int
ncplane_polyfill_locked(ncplane* n, int y, int x, const cell* c){
if(y >= n->leny || x >= n->lenx){
return 0; // not fillable
}
if(y < 0 || x < 0){
return 0; // not fillable
}
cell* cur = &n->fb[nfbcellidx(n, y, x)];
if(cur->gcluster){
return 0; // glyph, not polyfillable
}
if(cell_duplicate(n, cur, c) < 0){
return -1;
}
int r, ret = 1;
if((r = ncplane_polyfill_locked(n, y - 1, x, c)) < 0){
return -1;
}
ret += r;
if((r = ncplane_polyfill_locked(n, y + 1, x, c)) < 0){
return -1;
}
ret += r;
if((r = ncplane_polyfill_locked(n, y, x - 1, c)) < 0){
return -1;
}
ret += r;
if((r = ncplane_polyfill_locked(n, y, x + 1, c)) < 0){
return -1;
}
ret += r;
return ret;
}
// at the initial step only, invalid y, x is an error, so explicitly check.
int ncplane_polyfill_yx(ncplane* n, int y, int x, const cell* c){
int ret = -1;
if(y < n->leny && x < n->lenx){
if(y >= 0 && x >= 0){
ret = ncplane_polyfill_locked(n, y, x, c);
}
}
return ret;
}
// Our gradient is a 2d lerp among the four corners of the region. We start
// with the observation that each corner ought be its exact specified corner,
// and the middle ought be the exact average of all four corners' components.
// Another observation is that if all four corners are the same, every cell
// ought be the exact same color. From this arises the observation that a
// perimeter element is not affected by the other three sides:
//
// a corner element is defined by itself
// a perimeter element is defined by the two points on its side
// an internal element is defined by all four points
//
// 2D equation of state: solve for each quadrant's contribution (min 2x2):
//
// X' = (xlen - 1) - X
// Y' = (ylen - 1) - Y
// TLC: X' * Y' * TL
// TRC: X * Y' * TR
// BLC: X' * Y * BL
// BRC: X * Y * BR
// steps: (xlen - 1) * (ylen - 1) [maximum steps away from origin]
//
// Then add TLC + TRC + BLC + BRC + steps / 2, and divide by steps (the
// steps / 2 is to work around truncate-towards-zero).
static int
calc_gradient_component(unsigned tl, unsigned tr, unsigned bl, unsigned br,
int y, int x, int ylen, int xlen){
assert(y >= 0);
assert(y < ylen);
assert(x >= 0);
assert(x < xlen);
const int avm = (ylen - 1) - y;
const int ahm = (xlen - 1) - x;
if(xlen < 2){
if(ylen < 2){
return tl;
}
return (tl * avm + bl * y) / (ylen - 1);
}
if(ylen < 2){
return (tl * ahm + tr * x) / (xlen - 1);
}
const int tlc = ahm * avm * tl;
const int blc = ahm * y * bl;
const int trc = x * avm * tr;
const int brc = y * x * br;
const int divisor = (ylen - 1) * (xlen - 1);
return ((tlc + blc + trc + brc) + divisor / 2) / divisor;
}
// calculate one of the channels of a gradient at a particular point.
static inline uint32_t
calc_gradient_channel(uint32_t ul, uint32_t ur, uint32_t ll, uint32_t lr,
int y, int x, int ylen, int xlen){
uint32_t chan = 0;
channel_set_rgb_clipped(&chan,
calc_gradient_component(channel_r(ul), channel_r(ur),
channel_r(ll), channel_r(lr),
y, x, ylen, xlen),
calc_gradient_component(channel_g(ul), channel_g(ur),
channel_g(ll), channel_g(lr),
y, x, ylen, xlen),
calc_gradient_component(channel_b(ul), channel_b(ur),
channel_b(ll), channel_b(lr),
y, x, ylen, xlen));
return chan;
}
// calculate both channels of a gradient at a particular point, storing them
// into `c`->channels. x and y ought be the location within the gradient.
static inline void
calc_gradient_channels(cell* c, uint64_t ul, uint64_t ur, uint64_t ll,
uint64_t lr, int y, int x, int ylen, int xlen){
if(!channels_fg_default_p(ul)){
cell_set_fchannel(c, calc_gradient_channel(channels_fchannel(ul),
channels_fchannel(ur),
channels_fchannel(ll),
channels_fchannel(lr),
y, x, ylen, xlen));
}else{
cell_set_fg_default(c);
}
if(!channels_bg_default_p(ul)){
cell_set_bchannel(c, calc_gradient_channel(channels_bchannel(ul),
channels_bchannel(ur),
channels_bchannel(ll),
channels_bchannel(lr),
y, x, ylen, xlen));
}else{
cell_set_bg_default(c);
}
}
static bool
check_gradient_args(uint64_t ul, uint64_t ur, uint64_t bl, uint64_t br){
// Can't use default or palette-indexed colors in a gradient unless they're
// all the same.
if(channels_fg_default_p(ul) || channels_fg_default_p(ur) ||
channels_fg_default_p(bl) || channels_fg_default_p(br)){
if(!(channels_fg_default_p(ul) && channels_fg_default_p(ur) &&
channels_fg_default_p(bl) && channels_fg_default_p(br))){
return true;
}
}
if(channels_bg_default_p(ul) || channels_bg_default_p(ur) ||
channels_bg_default_p(bl) || channels_bg_default_p(br)){
if(!(channels_bg_default_p(ul) && channels_bg_default_p(ur) &&
channels_bg_default_p(bl) && channels_bg_default_p(br))){
return true;
}
}
if(channel_palindex_p(ul) || channel_palindex_p(bl) ||
channel_palindex_p(br) || channel_palindex_p(ur)){
return true; // FIXME
}
return false;
}
int ncplane_gradient(ncplane* n, const char* egc, uint32_t attrword,
uint64_t ul, uint64_t ur, uint64_t bl, uint64_t br,
int ystop, int xstop){
if(check_gradient_args(ul, ur, bl, br)){
return -1;
}
if(egc == NULL){
return true;
}
int yoff, xoff, ymax, xmax;
ncplane_cursor_yx(n, &yoff, &xoff);
// must be at least 1x1, with its upper-left corner at the current cursor
if(ystop < yoff){
return -1;
}
if(xstop < xoff){
return -1;
}
ncplane_dim_yx(n, &ymax, &xmax);
// must be within the ncplane
if(xstop >= xmax || ystop >= ymax){
return -1;
}
const int xlen = xstop - xoff + 1;
const int ylen = ystop - yoff + 1;
if(ylen == 1){
if(xlen == 1){
if(ul != ur || ur != br || br != bl){
return -1;
}
}else{
if(ul != bl || ur != br){
return -1;
}
}
}else if(xlen == 1){
if(ul != ur || bl != br){
return -1;
}
}
for(int y = yoff ; y <= ystop ; ++y){
for(int x = xoff ; x <= xstop ; ++x){
cell* targc = ncplane_cell_ref_yx(n, y, x);
targc->channels = 0;
if(cell_load(n, targc, egc) < 0){
return -1;
}
targc->attrword = attrword;
calc_gradient_channels(targc, ul, ur, bl, br, y - yoff, x - xoff, ylen, xlen);
}
}
return 0;
}
int ncplane_stain(struct ncplane* n, int ystop, int xstop,
uint64_t tl, uint64_t tr, uint64_t bl, uint64_t br){
// Can't use default or palette-indexed colors in a gradient
if(check_gradient_args(tl, tr, bl, br)){
return -1;
}
int yoff, xoff, ymax, xmax;
ncplane_cursor_yx(n, &yoff, &xoff);
// must be at least 1x1, with its upper-left corner at the current cursor
if(ystop < yoff){
return -1;
}
if(xstop < xoff){
return -1;
}
ncplane_dim_yx(n, &ymax, &xmax);
// must be within the ncplane
if(xstop >= xmax || ystop >= ymax){
return -1;
}
const int xlen = xstop - xoff + 1;
const int ylen = ystop - yoff + 1;
for(int y = yoff ; y <= ystop ; ++y){
for(int x = xoff ; x <= xstop ; ++x){
cell* targc = ncplane_cell_ref_yx(n, y, x);
calc_gradient_channels(targc, tl, tr, bl, br, y - yoff, x - xoff, ylen, xlen);
}
}
return 0;
}
int ncplane_format(struct ncplane* n, int ystop, int xstop, uint32_t attrword){
int yoff, xoff, ymax, xmax;
ncplane_cursor_yx(n, &yoff, &xoff);
// must be at least 1x1, with its upper-left corner at the current cursor
if(ystop < yoff){
return -1;
}
if(xstop < xoff){
return -1;
}
ncplane_dim_yx(n, &ymax, &xmax);
// must be within the ncplane
if(xstop >= xmax || ystop >= ymax){
return -1;
}
for(int y = yoff ; y < ystop + 1 ; ++y){
for(int x = xoff ; x < xstop + 1 ; ++x){
cell* targc = ncplane_cell_ref_yx(n, y, x);
targc->attrword = attrword;
}
}
return 0;
}
void ncplane_translate(const ncplane* src, const ncplane* dst,
int* restrict y, int* restrict x){
if(y){