diff options
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 32 |
1 files changed, 16 insertions, 16 deletions
@@ -2,25 +2,25 @@ [smooth] Sub-banding protocol revision. - Rasterization sub-banding is utilized at large sizes while using a - rather small fixed memory pool. Indeed it is possible to make an + Rasterization sub-banding is utilized at large sizes while using + rather small fixed memory pool. Indeed it is possible to make an educated guess how much memory is necessary at a given size for a - given glyph. It turns out that, for a large majority of European - glyphs, you should store about 8 times more boundary pixels than - their height. Or, vice versa, if your memory pool can hold 800 - pixels the band height should be 100 and you should sub-band - anything larger than that. Should you still run out of memory, - FreeType bisects the band but you have wasted some time. This is - what has been implemented in FreeType since the beginning. - - It was overlooked, however, that the top band could grow to twice - the default band size leading to unnecessary memory overflows there. - This commit fixes that. Now the bands are distributed more evenly - and cannot exceed the default size. + given glyph. It turns out that, for large majority of European glyphs, + you should store about 8 times more boundary pixels than their height. + Or, vice versa, if your memory pool can hold 800 pixels the band + height should be 100 and you should sub-band anything larger than + that. Should you still run out of memory, FreeType bisects the band + but you have wasted some time. This is what has been implemented in + FreeType since the beginning. + + It was overlooked, however, that the top band could grow to twice the + default band size leading to unnecessary memory overflows there. This + commit fixes that. Now the bands are distributed more evenly and + cannot exceed the default size. Now the magic number 8 is really suitable for rather simple European - scripts. For complex Chinese logograms the magic number should be - 13 but that is subject for another day. + scripts. For complex Chinese logograms the magic number should be 13 + but that is subject for another day. * src/smooth/ftgrays.c (gray_convert_glyph): Revise sub-banding protocol. |