[MPlayer-cvslog] CVS: main/libvo gl_common.c,1.26,1.27

[Reimar Döffinger CVS]

CVS change done by Reimar Döffinger CVS

Update of /cvsroot/mplayer/main/libvo
In directory mail:/var2/tmp/cvs-serv2329

Modified Files:
	gl_common.c 
Log Message:
contrast 0 should lead to a grey, not a black image


Index: gl_common.c
===================================================================
RCS file: /cvsroot/mplayer/main/libvo/gl_common.c,v
retrieving revision 1.26
retrieving revision 1.27
diff -u -r1.26 -r1.27
--- gl_common.c	25 Sep 2005 16:12:01 -0000	1.26
+++ gl_common.c	25 Sep 2005 16:17:03 -0000	1.27
@@ -563,6 +563,11 @@
   rc = (-16 * ry + (-128) * ru + (-128) * rv) / 255.0 + brightness;
   gc = (-16 * gy + (-128) * gu + (-128) * gv) / 255.0 + brightness;
   bc = (-16 * by + (-128) * bu + (-128) * bv) / 255.0 + brightness;
+  // these "center" contrast control so that e.g. a contrast of 0
+  // leads to a grey image, not a black one
+  rc += 0.5 - contrast / 2.0;
+  gc += 0.5 - contrast / 2.0;
+  bc += 0.5 - contrast / 2.0;
   rgamma = 1.0 / rgamma;
   ggamma = 1.0 / ggamma;
   bgamma = 1.0 / bgamma;