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fade: factor out duplicated maxsteps determination #659

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nick black 2020-06-01 01:45:08 -04:00 committed by Nick Black
parent 3ff083b73f
commit 0766dd08e7
1 changed files with 38 additions and 45 deletions
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83
src/lib/fade.c
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@ -1,18 +1,19 @@
#include "internal.h"
typedef struct planepalette {
typedef struct ncfadectx {
int rows; // number of rows when allocated
int cols; // number of columns when allocated
int maxsteps; // maximum number of iterations
unsigned maxr, maxg, maxb; // maxima across foreground channels
unsigned maxbr, maxbg, maxbb; // maxima across background channels
uint64_t* channels; // all channels from the framebuffer
} planepalette;
} ncfadectx;
// These arrays are too large to be safely placed on the stack. Get an atomic
// snapshot of all channels on the plane. While copying the snapshot, determine
// the maxima across each of the six components.
static int
alloc_ncplane_palette(ncplane* n, planepalette* pp){
alloc_ncplane_palette(ncplane* n, ncfadectx* pp){
ncplane_dim_yx(n, &pp->rows, &pp->cols);
// add an additional element for the background cell
int size = pp->rows * pp->cols + 1;
@ -73,22 +74,22 @@ alloc_ncplane_palette(ncplane* n, planepalette* pp){
if(bb > pp->maxbb){
pp->maxbb = bb;
}
int maxfsteps = pp->maxg > pp->maxr ? (pp->maxb > pp->maxg ? pp->maxb : pp->maxg) :
(pp->maxb > pp->maxr ? pp->maxb : pp->maxr);
int maxbsteps = pp->maxbg > pp->maxbr ? (pp->maxbb > pp->maxbg ? pp->maxbb : pp->maxbg) :
(pp->maxbb > pp->maxbr ? pp->maxbb : pp->maxbr);
pp->maxsteps = maxfsteps > maxbsteps ? maxfsteps : maxbsteps;
if(pp->maxsteps == 0){
pp->maxsteps = 1;
}
return 0;
}
static int
ncplane_fadein_internal(ncplane* n, const struct timespec* ts,
fadecb fader, planepalette* pp, void* curry){
int maxfsteps = pp->maxg > pp->maxr ? (pp->maxb > pp->maxg ? pp->maxb : pp->maxg) :
(pp->maxb > pp->maxr ? pp->maxb : pp->maxr);
int maxbsteps = pp->maxbg > pp->maxbr ? (pp->maxbb > pp->maxbg ? pp->maxbb : pp->maxbg) :
(pp->maxbb > pp->maxbr ? pp->maxbb : pp->maxbr);
int maxsteps = maxfsteps > maxbsteps ? maxfsteps : maxbsteps;
if(maxsteps == 0){
maxsteps = 1;
}
fadecb fader, ncfadectx* pp, void* curry){
uint64_t nanosecs_total = ts->tv_sec * NANOSECS_IN_SEC + ts->tv_nsec;
uint64_t nanosecs_step = nanosecs_total / maxsteps;
uint64_t nanosecs_step = nanosecs_total / pp->maxsteps;
if(nanosecs_step == 0){
nanosecs_step = 1;
}
@ -103,7 +104,7 @@ ncplane_fadein_internal(ncplane* n, const struct timespec* ts,
clock_gettime(CLOCK_MONOTONIC, &times);
curns = times.tv_sec * NANOSECS_IN_SEC + times.tv_nsec;
int iter = (curns - startns) / nanosecs_step + 1;
if(iter > maxsteps){
if(iter > pp->maxsteps){
break;
}
int y, x;
@ -119,15 +120,15 @@ ncplane_fadein_internal(ncplane* n, const struct timespec* ts,
channels_bg_rgb(pp->channels[pp->cols * y + x], &br, &bg, &bb);
cell* c = &n->fb[dimx * y + x];
if(!cell_fg_default_p(c)){
r = r * iter / maxsteps;
g = g * iter / maxsteps;
b = b * iter / maxsteps;
r = r * iter / pp->maxsteps;
g = g * iter / pp->maxsteps;
b = b * iter / pp->maxsteps;
cell_set_fg_rgb(c, r, g, b);
}
if(!cell_bg_default_p(c)){
br = br * iter / maxsteps;
bg = bg * iter / maxsteps;
bb = bb * iter / maxsteps;
br = br * iter / pp->maxsteps;
bg = bg * iter / pp->maxsteps;
bb = bb * iter / pp->maxsteps;
cell_set_bg_rgb(c, br, bg, bb);
}
}
@ -152,23 +153,15 @@ ncplane_fadein_internal(ncplane* n, const struct timespec* ts,
}
int ncplane_fadeout(ncplane* n, const struct timespec* ts, fadecb fader, void* curry){
planepalette pp;
ncfadectx pp;
if(!n->nc->tcache.RGBflag && !n->nc->tcache.CCCflag){ // terminal can't fade
return -1;
}
if(alloc_ncplane_palette(n, &pp)){
return -1;
}
int maxfsteps = pp.maxg > pp.maxr ? (pp.maxb > pp.maxg ? pp.maxb : pp.maxg) :
(pp.maxb > pp.maxr ? pp.maxb : pp.maxr);
int maxbsteps = pp.maxbg > pp.maxbr ? (pp.maxbb > pp.maxbg ? pp.maxbb : pp.maxbg) :
(pp.maxbb > pp.maxbr ? pp.maxbb : pp.maxbr);
int maxsteps = maxfsteps > maxbsteps ? maxfsteps : maxbsteps;
if(maxsteps == 0){
maxsteps = 1;
}
uint64_t nanosecs_total = timespec_to_ns(ts);
uint64_t nanosecs_step = nanosecs_total / maxsteps;
uint64_t nanosecs_step = nanosecs_total / pp.maxsteps;
if(nanosecs_step == 0){
nanosecs_step = 1;
}
@ -182,7 +175,7 @@ int ncplane_fadeout(ncplane* n, const struct timespec* ts, fadecb fader, void* c
unsigned r, g, b;
uint64_t curns = times.tv_sec * NANOSECS_IN_SEC + times.tv_nsec;
int iter = (curns - startns) / nanosecs_step + 1;
if(iter > maxsteps){
if(iter > pp.maxsteps){
break;
}
int y, x;
@ -195,16 +188,16 @@ int ncplane_fadeout(ncplane* n, const struct timespec* ts, fadecb fader, void* c
cell* c = &n->fb[dimx * y + x];
if(!cell_fg_default_p(c)){
channels_fg_rgb(pp.channels[pp.cols * y + x], &r, &g, &b);
r = r * (maxsteps - iter) / maxsteps;
g = g * (maxsteps - iter) / maxsteps;
b = b * (maxsteps - iter) / maxsteps;
r = r * (pp.maxsteps - iter) / pp.maxsteps;
g = g * (pp.maxsteps - iter) / pp.maxsteps;
b = b * (pp.maxsteps - iter) / pp.maxsteps;
cell_set_fg_rgb(c, r, g, b);
}
if(!cell_bg_default_p(c)){
channels_bg_rgb(pp.channels[pp.cols * y + x], &br, &bg, &bb);
br = br * (maxsteps - iter) / maxsteps;
bg = bg * (maxsteps - iter) / maxsteps;
bb = bb * (maxsteps - iter) / maxsteps;
br = br * (pp.maxsteps - iter) / pp.maxsteps;
bg = bg * (pp.maxsteps - iter) / pp.maxsteps;
bb = bb * (pp.maxsteps - iter) / pp.maxsteps;
cell_set_bg_rgb(c, br, bg, bb);
}
}
@ -212,16 +205,16 @@ int ncplane_fadeout(ncplane* n, const struct timespec* ts, fadecb fader, void* c
cell* c = &n->basecell;
if(!cell_fg_default_p(c)){
channels_fg_rgb(pp.channels[pp.cols * y], &r, &g, &b);
r = r * (maxsteps - iter) / maxsteps;
g = g * (maxsteps - iter) / maxsteps;
b = b * (maxsteps - iter) / maxsteps;
r = r * (pp.maxsteps - iter) / pp.maxsteps;
g = g * (pp.maxsteps - iter) / pp.maxsteps;
b = b * (pp.maxsteps - iter) / pp.maxsteps;
cell_set_fg_rgb(&n->basecell, r, g, b);
}
if(!cell_bg_default_p(c)){
channels_bg_rgb(pp.channels[pp.cols * y], &br, &bg, &bb);
br = br * (maxsteps - iter) / maxsteps;
bg = bg * (maxsteps - iter) / maxsteps;
bb = bb * (maxsteps - iter) / maxsteps;
br = br * (pp.maxsteps - iter) / pp.maxsteps;
bg = bg * (pp.maxsteps - iter) / pp.maxsteps;
bb = bb * (pp.maxsteps - iter) / pp.maxsteps;
cell_set_bg_rgb(&n->basecell, br, bg, bb);
}
uint64_t nextwake = (iter + 1) * nanosecs_step + startns;
@ -250,7 +243,7 @@ int ncplane_fadeout(ncplane* n, const struct timespec* ts, fadecb fader, void* c
}
int ncplane_fadein(ncplane* n, const struct timespec* ts, fadecb fader, void* curry){
planepalette pp;
ncfadectx pp;
if(!n->nc->tcache.RGBflag && !n->nc->tcache.CCCflag){ // terminal can't fade
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
@ -270,7 +263,7 @@ int ncplane_fadein(ncplane* n, const struct timespec* ts, fadecb fader, void* cu
}
int ncplane_pulse(ncplane* n, const struct timespec* ts, fadecb fader, void* curry){
planepalette pp;
ncfadectx pp;
int ret;
if(!n->nc->tcache.RGBflag && !n->nc->tcache.CCCflag){ // terminal can't fade
return -1;