diff options
| author | cinap_lenrek <cinap_lenrek@felloff.net> | 2014-09-14 17:03:56 +0200 |
|---|---|---|
| committer | cinap_lenrek <cinap_lenrek@felloff.net> | 2014-09-14 17:03:56 +0200 |
| commit | fdf3883ce43eefe329c93494c32b7005a86759fb (patch) | |
| tree | cbdcf93b6ce80a7b89937df779be00faacbbc7de /sys/src/libmemdraw | |
| parent | e9fddbaad81de8afbffe3f8ff626a18a551619df (diff) | |
libmemdraw: update drawtest to use same rounding in alpha calculation as libmemdraw
Diffstat (limited to 'sys/src/libmemdraw')
| -rw-r--r-- | sys/src/libmemdraw/drawtest.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/sys/src/libmemdraw/drawtest.c b/sys/src/libmemdraw/drawtest.c index df9dd0123..7f71a37cb 100644 --- a/sys/src/libmemdraw/drawtest.c +++ b/sys/src/libmemdraw/drawtest.c @@ -974,7 +974,7 @@ drawonepixel(Memimage *dst, Point dp, Memimage *src, Point sp, Memimage *mask, P pixtorgba(getpixel(dst, dp), &dr, &dg, &db, &da); pixtorgba(getpixel(src, sp), &sr, &sg, &sb, &sa); m = getmask(mask, mp); - M = 255-(sa*m)/255; + M = 255-(sa*m + 127)/255; DBG print("dst %x %x %x %x src %x %x %x %x m %x = ", dr,dg,db,da, sr,sg,sb,sa, m); if(dst->flags&Fgrey){ @@ -985,18 +985,18 @@ DBG print("dst %x %x %x %x src %x %x %x %x m %x = ", dr,dg,db,da, sr,sg,sb,sa, m */ sk = RGB2K(sr, sg, sb); dk = RGB2K(dr, dg, db); - dk = (sk*m + dk*M)/255; + dk = (sk*m + dk*M + 127)/255; dr = dg = db = dk; - da = (sa*m + da*M)/255; + da = (sa*m + da*M + 127)/255; }else{ /* * True color alpha calculation treats all channels (including alpha) * the same. It might have been nice to use an array, but oh well. */ - dr = (sr*m + dr*M)/255; - dg = (sg*m + dg*M)/255; - db = (sb*m + db*M)/255; - da = (sa*m + da*M)/255; + dr = (sr*m + dr*M + 127)/255; + dg = (sg*m + dg*M + 127)/255; + db = (sb*m + db*M + 127)/255; + da = (sa*m + da*M + 127)/255; } DBG print("%x %x %x %x\n", dr,dg,db,da); |