correct C init tables

Originally committed as revision 11692 to svn://svn.mplayerhq.hu/mplayer/trunk/postproc

postproc/yuv2rgb.c

@@ -642,8 +642,8 @@ static int div_round (int dividend, int divisor)
 
 int yuv2rgb_c_init_tables (SwsContext *c, const int inv_table[4], int fullRange, int brightness, int contrast, int saturation)
 {  
-    const int bpp= c->dstFormat&0xFF;
-    const int isRgb= (c->dstFormat>>24) != 'R';
+    const int isRgb = IMGFMT_IS_RGB(c->dstFormat);
+    const int bpp = isRgb?IMGFMT_RGB_DEPTH(c->dstFormat):IMGFMT_BGR_DEPTH(c->dstFormat);
     int i;
     uint8_t table_Y[1024];
     uint32_t *table_32 = 0;