ref: 35d6448581414f216d1295437ad3a911ea6699e4
dir: /picker.c/
#include <u.h>
#include <libc.h>
#include <thread.h>
#include <draw.h>
#include <memdraw.h>
#include <mouse.h>
#include <keyboard.h>
#include "hsluv.h"
#define MAX(a,b) ((a)>=(b)?(a):(b))
#define MIN(a,b) ((a)<=(b)?(a):(b))
#define D2C(x) (int)MAX(0, MIN(0xff, x*256.0))
enum
{
Ckey,
Cmouse,
Cresize,
Numchan,
Offset = 6,
Sliderheight = 48,
};
typedef struct Color Color;
typedef struct Space Space;
struct Color {
Rectangle r;
double v[4];
double rgba[4];
ulong u;
Image *i;
};
struct Space {
char *name;
char opt;
char single;
void (*torgb)(double *v, double *rgb);
void (*fromrgb)(double *rgb, double *v);
double max[4];
};
static void
_hsluv2rgb(double *v, double *rgb)
{
hsluv2rgb(v[0], v[1], v[2], rgb+0, rgb+1, rgb+2);
}
static void
_rgb2hsluv(double *rgb, double *v)
{
rgb2hsluv(rgb[0], rgb[1], rgb[2], v+0, v+1, v+2);
}
static void
_hpluv2rgb(double *v, double *rgb)
{
hpluv2rgb(v[0], v[1], v[2], rgb+0, rgb+1, rgb+2);
}
static void
_rgb2hpluv(double *rgb, double *v)
{
rgb2hpluv(rgb[0], rgb[1], rgb[2], v+0, v+1, v+2);
}
static void
_torgb(double *v, double *rgb)
{
rgb[0] = v[0];
rgb[1] = v[1];
rgb[2] = v[2];
}
static void
_fromrgb(double *rgb, double *v)
{
v[0] = rgb[0];
v[1] = rgb[1];
v[2] = rgb[2];
}
static Space spaces[] = {
{
.name = "HSLuv",
.opt = 's',
.single = 0,
.torgb = _hsluv2rgb,
.fromrgb = _rgb2hsluv,
.max = {360.0, 100.0, 100.0, 1.0},
},
{
.name = "HPLuv",
.opt = 'l',
.single = 0,
.torgb = _hpluv2rgb,
.fromrgb = _rgb2hpluv,
.max = {360.0, 100.0, 100.0, 1.0},
},
{
.name = "RGB",
.opt = 'r',
.single = 1,
.torgb = _torgb,
.fromrgb = _fromrgb,
.max = {1.0, 1.0, 1.0, 1.0},
},
};
static char *menu2i[nelem(spaces)+2] = {
"snarf",
};
static Menu menu2 = { .item = menu2i };
static Color *colors;
static int ncolors, curcolor, nchan;
static Rectangle srects[3];
static Space *space;
static Image *bg;
static char hex[12];
static ulong
rgba2u(double *rgba)
{
return D2C(rgba[0])<<24 | D2C(rgba[1])<<16 | D2C(rgba[2])<<8 | D2C(rgba[3]);
}
static Image *
slider(int si, int w)
{
static Image *s, *sliders[4];
static u8int *b, *buf[4];
double c[4], rgba[4], dt;
Rectangle rect;
int i, n, mi;
ulong u;
rect = Rect(0, 0, w, 1);
s = sliders[si];
if (s == nil || Dx(s->r) != w) {
buf[si] = realloc(buf[si], 4*w);
if (s != nil)
freeimage(s);
if ((s = sliders[si] = allocimage(display, rect, RGBA32, 1, DNofill)) == nil)
sysfatal("allocimage: %r");
}
b = buf[si];
memmove(c, colors[curcolor].v, sizeof(c));
if (space->single) {
memset(c, 0, 3*sizeof(double));
c[si] = colors[curcolor].v[si];
}
dt = space->max[si] / w;
mi = c[si] / dt;
c[si] = 0.0;
for (i = n = 0; i < w; i++, n += 4) {
space->torgb(c, rgba);
rgba[3] = c[3];
u = rgba2u(rgba);
u = setalpha(u, u&0xff);
b[n] = 0xff;
if (mi-2 == i)
memset(b+n+1, 0, 3);
else if (mi-1 == i)
memset(b+n+1, 0xff, 3);
else if (mi+1 == i)
memset(b+n+1, 0xff, 3);
else if (mi+2 == i)
memset(b+n+1, 0, 3);
else {
b[n+0] = u & 0xff;
b[n+1] = (u>>8) & 0xff;
b[n+2] = (u>>16) & 0xff;
b[n+3] = (u>>24) & 0xff;
}
c[si] = MIN(space->max[si], c[si] + dt);
}
loadimage(s, rect, b, 4*w);
return s;
}
static void
redraw(void)
{
Rectangle r, cr;
Image *im;
int i, colw;
lockdisplay(display);
draw(screen, screen->r, display->white, nil, ZP);
r = screen->r;
r.min.x += Offset;
r.min.y += Offset;
r.max.x -= Offset;
r.max.y = r.min.y + Sliderheight;
/* sliders */
for (i = 0; i < nchan; i++) {
srects[i] = r;
im = slider(i, Dx(r));
draw(screen, r, bg, nil, ZP);
draw(screen, r, im, nil, ZP);
r.min.y += Sliderheight + Offset;
r.max.y += Sliderheight + Offset;
}
/* palette */
colw = MIN(Sliderheight, (Dx(r)-(ncolors-1)*Offset)/ncolors);
cr = r;
cr.min.x += (Dx(cr) - colw*ncolors - (ncolors-1)*Offset) / 2;
for (i = 0; i < ncolors; i++) {
if (i == curcolor) {
freeimage(colors[i].i);
colors[i].i = nil;
}
if (colors[i].i == nil) {
colors[i].i = allocimage(display, Rect(0, 0, 1, 1), RGBA32, 1, setalpha(colors[i].u | 0xff, colors[i].u & 0xff));
if (colors[i].i == nil)
sysfatal("allocimage: %r");
}
cr.max.x = cr.min.x + colw;
draw(screen, cr, bg, nil, ZP);
draw(screen, cr, colors[i].i, nil, ZP);
colors[i].r = insetrect(cr, -3);
if (i == curcolor)
border(screen, colors[i].r, 2, display->black, ZP);
cr.min.x += colw + Offset;
}
r.min.y += Sliderheight + Offset;
/* current color */
r.max.y = screen->r.max.y - Offset;
draw(screen, r, bg, nil, ZP);
draw(screen, r, colors[curcolor].i, nil, ZP);
/* current color in hex */
if (nchan > 3)
sprint(hex, "%08lux", colors[curcolor].u);
else
sprint(hex, "%06lux", colors[curcolor].u>>8);
r.min.x += Dx(r)/2 - stringwidth(font, hex)/2;
r.min.y += Dy(r)/2 - font->height/2;
stringbg(screen, r.min, display->white, ZP, font, hex, display->black, ZP);
flushimage(display, 1);
unlockdisplay(display);
}
static void
usage(void)
{
int i;
print("usage: %s [-e] [-", argv0);
for (i = 0; i < nelem(spaces); i++)
print("%c", spaces[i].opt);
print("] [-a] rrggbb[aa] ...\n");
threadexitsall("usage");
}
static void
loadbg(void)
{
Rectangle r;
u8int *d;
int i, j;
r = Rect(0, 0, Sliderheight, Sliderheight);
d = calloc(1, Sliderheight*Sliderheight);
for (i = 0; i < Sliderheight/2; i++) {
for (j = 0; j < Sliderheight/2; j++)
d[j*Sliderheight+i] = 0xff;
}
for (; i < Sliderheight; i++) {
for (j = Sliderheight/2; j < Sliderheight; j++)
d[j*Sliderheight+i] = 0xff;
}
if ((bg = allocimage(display, r, GREY8, 1, DNofill)) == nil)
sysfatal("allocimage: %r");
if (loadimage(bg, r, d, Sliderheight*Sliderheight) < 0)
sysfatal("loadimage: %r");
free(d);
}
static int
printcolor(void)
{
int n;
char buf[16];
if (nchan < 4)
n = sprint(buf, "%d %06lux\n", curcolor, colors[curcolor].u>>8);
else
n = sprint(buf, "%d %08lux\n", curcolor, colors[curcolor].u);
return write(1, buf, n) == n ? 0 : -1;
}
static int
str2color(char *s, Color *c)
{
vlong v;
char *e;
int i;
if (strlen(s) != nchan*2) {
werrstr("wrong number of components");
return -1;
}
if ((v = strtoll(s, &e, 16)) == 0 && (e == s || *e || v < 0)) {
werrstr("invalid color");
return -1;
}
if (nchan < 4) {
v <<= 8;
v |= 0xff;
}
c->u = v;
for (i = 0; i < 4; i++) {
c->rgba[i] = (double)((v>>24)&0xff) / 255.0;
v <<= 8;
}
c->v[3] = c->rgba[3];
space->fromrgb(c->rgba, c->v);
return 0;
}
void
threadmain(int argc, char **argv)
{
Mousectl *mctl;
Keyboardctl *kctl;
Rune r;
Mouse m;
Alt a[Numchan+1] = {
[Ckey] = { nil, &r, CHANRCV },
[Cmouse] = { nil, &m, CHANRCV },
[Cresize] = { nil, nil, CHANRCV },
{ nil, nil, CHANEND },
};
Color *c;
int i, once;
ulong u;
space = &spaces[0];
nchan = 3;
once = 0;
ARGBEGIN{
case 'a':
nchan = 4;
break;
case 'e':
once = 1;
break;
default:
space = nil;
for (i = 0; i < nelem(spaces); i++) {
if (spaces[i].opt == ARGC()) {
space = &spaces[i];
break;
}
}
if (space == nil) {
fprint(2, "unknown color space '%c'\n", ARGC());
usage();
}
break;
}ARGEND
ncolors = argc;
if (ncolors < 1) {
fprint(2, "no colors specified\n");
usage();
}
colors = calloc(ncolors, sizeof(Color));
for (i = 0; i < ncolors; i++) {
if (str2color(argv[i], &colors[i]) != 0) {
fprint(2, "'%s': %r\n", argv[i]);
usage();
}
}
for (i = 0; i < nelem(spaces); i++)
menu2i[i+1] = spaces[i].name;
if (initdraw(nil, nil, "picker") < 0)
sysfatal("initdraw: %r");
if ((kctl = initkeyboard(nil)) == nil)
sysfatal("initkeyboard: %r");
a[Ckey].c = kctl->c;
if ((mctl = initmouse(nil, screen)) == nil)
sysfatal("initmouse: %r");
a[Cmouse].c = mctl->c;
a[Cresize].c = mctl->resizec;
display->locking = 1;
unlockdisplay(display);
if (nchan > 3)
loadbg();
redraw();
for (;;) {
next:
c = &colors[curcolor];
switch (alt(a)) {
case -1:
goto end;
case Ckey:
switch (r) {
case Kleft:
curcolor = MAX(0, curcolor-1);
redraw();
break;
case Kright:
curcolor = MIN(ncolors-1, curcolor+1);
redraw();
break;
case Kdel:
goto end;
}
break;
case Cmouse:
if (m.buttons == 1) {
m.xy.x = MAX(screen->r.min.x, MIN(screen->r.max.x, m.xy.x));
for (i = 0; i < nchan; i++) {
Rectangle r = srects[i];
r.max.x += 1;
if (ptinrect(m.xy, r)) {
c->v[i] = MIN(space->max[i], (double)(m.xy.x - r.min.x) * space->max[i]/(double)(Dx(r)-1));
c->rgba[3] = c->v[3];
changed:
space->torgb(c->v, c->rgba);
u = rgba2u(c->rgba);
if (c->u != u) {
c->u = u;
if (!once)
printcolor();
}
redraw();
goto next;
}
}
for (i = 0; i < ncolors; i++) {
if (ptinrect(m.xy, colors[i].r)) {
curcolor = i;
redraw();
goto next;
}
}
} else if (m.buttons == 2) {
if ((i = menuhit(2, mctl, &menu2, nil)) >= 0) {
if (i == 0) {
int f;
if ((f = open("/dev/snarf", OWRITE)) >= 0) {
write(f, hex, strlen(hex));
close(f);
}
} else {
space = &spaces[i];
space->fromrgb(c->rgba, c->v);
for (i = 0; i < 3; i++)
c->v[i] = MAX(0.0, MIN(space->max[i], c->v[i]));
goto changed;
}
}
} else if (m.buttons == 4) {
if (enter(nchan < 4 ? "rgb:" : "rgba:", hex+1, sizeof(hex)-1, mctl, kctl, nil) > 0) {
u = c->u;
if (str2color(hex+1, c) == 0 && c->u != u) {
c->u = ~c->u; /* just for the update to kick in */
goto changed;
}
}
}
break;
case Cresize:
getwindow(display, Refnone);
redraw();
break;
}
}
end:
if (once) {
for (i = 0; i < ncolors; i++) {
if (nchan < 4)
print("%06lux ", colors[i].u>>8);
else
print("%08lux ", colors[i].u);
}
print("\n");
}
threadexitsall(nil);
}