actions/itgmania212121
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

improve color conversion

Browse Source
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
Download Patch File Download Diff File Expand all files Collapse all files
stepmania/src/RageSurfaceUtils.cpp
+14 -1
View File
@@ -576,8 +576,21 @@ static bool blit_rgba_to_rgba( const RageSurface *src_surf, const RageSurface *d
else
lookup[c][0] = 0;
} 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 )
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 );
}
}