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Explain why make_frames works

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Rangi 2022-02-21 08:58:22 -05:00
parent 418b73bc6d
commit 2cc17f780a
1 changed files with 1 additions and 2 deletions
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3
tools/pokemon_animation.c
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@ -107,8 +107,7 @@ void make_frames(const uint8_t *tilemap, long tilemap_size, int width, struct Fr
} }
bitmask->bitlength++; bitmask->bitlength++;
} }
// I don't remember exactly why this works. // tile order ABCDEFGHIJKLMNOP... becomes db order %HGFEDCBA %PONMLKJI ...
// I think it was that the bits are read backwards, but not indexed backwards.
int last = bitmask->bitlength - 1; int last = bitmask->bitlength - 1;
bitmask->data[last / 8] >>= (7 - (last % 8)); bitmask->data[last / 8] >>= (7 - (last % 8));