Save opaque alpha in the destination, fixes white spotlight in testalpha on Mac OS X.
--- a/src/video/SDL_RLEaccel.c Mon Dec 01 00:41:15 2008 +0000
+++ b/src/video/SDL_RLEaccel.c Mon Dec 01 00:41:19 2008 +0000
@@ -971,7 +971,7 @@
s &= 0xff00; \
d &= 0xff00; \
d = (d + ((s - d) * alpha >> 8)) & 0xff00; \
- dst = d1 | d; \
+ dst = d1 | d | 0xff000000; \
} while(0)
/*