ref: ffde0eda463e8b908975abcabc5345cfaa1a14f7
parent: e2ca58cb3ef6991fb467b30b7693e7b91692fa82
author: cinap_lenrek <cinap_lenrek@felloff.net>
date: Sun Jun 25 18:14:52 EDT 2017
aux/vga: simplify vesa by adding rgbmask2chan() function
--- a/sys/src/cmd/aux/vga/vesa.c
+++ b/sys/src/cmd/aux/vga/vesa.c
@@ -36,8 +36,6 @@
int dx, dy;
int depth;
char *model;
- int r, g, b, x;
- int ro, go, bo, xo;
int directcolor; /* flags */
ulong paddr;
};
@@ -119,6 +117,36 @@
return f[0];
}
+static char*
+rgbmask2chan(char *buf, int depth, u32int rm, u32int gm, u32int bm)
+{+ u32int m[4], dm; /* r,g,b,x */
+ char tmp[32];
+ int c, n;
+
+ dm = 1<<depth-1;
+ dm |= dm-1;
+
+ m[0] = rm & dm;
+ m[1] = gm & dm;
+ m[2] = bm & dm;
+ m[3] = (~(m[0] | m[1] | m[2])) & dm;
+
+ buf[0] = 0;
+Next:
+ for(c=0; c<4; c++){+ for(n = 0; m[c] & (1<<n); n++)
+ ;
+ if(n){+ m[0] >>= n, m[1] >>= n, m[2] >>= n, m[3] >>= n;
+ snprint(tmp, sizeof tmp, "%c%d%s", "rgbx"[c], n, buf);
+ strcpy(buf, tmp);
+ goto Next;
+ }
+ }
+ return buf;
+}
+
Mode*
dbvesamode(Vga *vga, char *size)
{@@ -732,14 +760,6 @@
m->model = modelstr[mod];
break;
}
- m->r = p[31];
- m->g = p[33];
- m->b = p[35];
- m->x = p[37];
- m->ro = p[32];
- m->go = p[34];
- m->bo = p[36];
- m->xo = p[38];
m->directcolor = p[39];
m->paddr = LONG(p+40);
@@ -747,45 +767,11 @@
if(m->depth <= 8)
snprint(m->chan, sizeof m->chan, "%c%d",
(m->attr & AttrColor) ? 'm' : 'k', m->depth);
- else {- int o;
- ulong d, c, x;
-
- m->xo = m->x = 0;
- d = 1<<m->depth-1;
- d |= d-1;
- c = ((1<<m->r)-1) << m->ro;
- c |= ((1<<m->g)-1) << m->go;
- c |= ((1<<m->b)-1) << m->bo;
- if(x = d ^ c){- for(; (x & 1) == 0; x >>= 1)
- m->xo++;
- for(; (x & 1) == 1; x >>= 1)
- m->x++;
- }
-
- o = 0;
- m->chan[0] = 0;
- while(o < m->depth){- char tmp[sizeof m->chan];
-
- if(m->r && m->ro == o){- snprint(tmp, sizeof tmp, "r%d%s", m->r, m->chan);
- o += m->r;
- }else if(m->g && m->go == o){- snprint(tmp, sizeof tmp, "g%d%s", m->g, m->chan);
- o += m->g;
- }else if(m->b && m->bo == o){- snprint(tmp, sizeof tmp, "b%d%s", m->b, m->chan);
- o += m->b;
- }else if(m->x && m->xo == o){- snprint(tmp, sizeof tmp, "x%d%s", m->x, m->chan);
- o += m->x;
- }else
- break;
- strncpy(m->chan, tmp, sizeof m->chan);
- }
- }
+ else
+ rgbmask2chan(m->chan, m->depth,
+ (1UL<<p[31])-1 << p[32],
+ (1UL<<p[33])-1 << p[34],
+ (1UL<<p[35])-1 << p[36]);
return 0;
}