Follow-up Comment #13, bug #17573 (project wesnoth):
This version of the patch has been moved to sdl_utils. It is only compiled
in with gcc, and it should only operate when the library versions of glibc and
SDL lib indicate there might be a bug with SDL.
One potential problem. I looked through the assembler for memcpy and it is
processor specific and uses heuristic numbers to determine when to specific
processor specific block copying methods, hence the bug does/doesn't replicate
depending on the size and exact offset of the allocated memory. I allocated
the test memory with a 1 byte offset and test it x=3 times before deciding
that the bug doesn't occur. The most times I saw on my machine the bug not
occur was 4 times, but making the number of tests larger will make the first x
screen scrolls glitchy.
One addition to make it affect fewer systems would be to not compile it in
when the compile time libraries indicate no problem will happen.
(file #12653)
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Additional Item Attachment:
File name: SDL_BlitSurfacePatch.5.patch Size:9 KB
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