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improve color conversion

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This commit is contained in:
Glenn Maynard
2004-09-05 22:54:49 +00:00
parent 9f38c2237c
commit d990cc92f8
1 changed files with 14 additions and 1 deletions
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stepmania/src/RageSurfaceUtils.cpp
+14 -1
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@@ -576,8 +576,21 @@ static bool blit_rgba_to_rgba( const RageSurface *src_surf, const RageSurface *d
else else
lookup[c][0] = 0; lookup[c][0] = 0;
} else { } else {
/*
* Calculate a color conversion table. There are a few ways we can do
* this (each list is the resulting table for 4->2 bit):
*
* SCALE( i, 0, max_src_val+1, 0, max_dst_val+1 );
* { 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3 }
* SCALE( i, 0, max_src_val, 0, max_dst_val );
* { 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3 }
* lrintf( ((float) i / max_src_val) * max_dst_val )
* { 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3 }
*
* We use the first, since it gives the most even distribution.
*/
for( uint32_t i = 0; i <= max_src_val; ++i ) for( uint32_t i = 0; i <= max_src_val; ++i )
lookup[c][i] = (uint8_t) SCALE( i, 0, max_src_val, 0, max_dst_val ); lookup[c][i] = (uint8_t) SCALE( i, 0, max_src_val+1, 0, max_dst_val+1 );
} }
} }