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comparison src/video/SDL_RLEaccel.c @ 2817:b039bfa19ccd

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Save opaque alpha in the destination, fixes white spotlight in testalpha on Mac OS X.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 01 Dec 2008 00:41:19 +0000
parents 5f3831f1c3ea
children 4dba7aa7ea77
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2816:22e393158355 2817:b039bfa19ccd
969 Uint32 d1 = d & 0xff00ff; \ 969 Uint32 d1 = d & 0xff00ff; \
970 d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; \ 970 d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; \
971 s &= 0xff00; \ 971 s &= 0xff00; \
972 d &= 0xff00; \ 972 d &= 0xff00; \
973 d = (d + ((s - d) * alpha >> 8)) & 0xff00; \ 973 d = (d + ((s - d) * alpha >> 8)) & 0xff00; \
974 dst = d1 | d; \ 974 dst = d1 | d | 0xff000000; \
975 } while(0) 975 } while(0)
976 976
977 /* 977 /*
978 * For 16bpp pixels, we have stored the 5 most significant alpha bits in 978 * For 16bpp pixels, we have stored the 5 most significant alpha bits in
979 * bits 5-10. As before, we can process all 3 RGB components at the same time. 979 * bits 5-10. As before, we can process all 3 RGB components at the same time.