shithub: freetype+ttf2subf

Info  •  Files  •  Log  •  Branches

Expand comment.

git/fs: mount .git/fs: mount/attach disallowed

--- a/src/smooth/ftgrays.c

+++ b/src/smooth/ftgrays.c

@@ -373,8 +373,13 @@

 #endif /* __arm__ */

-  /* These macros speed up repetitive divisions by replacing them */

-  /* with multiplications and right shifts.                       */

+  /* Calculating coverages for a slanted line requires a division each */

+  /* time the line crosses from cell to cell.  These macros speed up   */

+  /* the repetitive divisions by replacing them with multiplications   */

+  /* and right shifts so that at most two divisions are performed for  */

+  /* each slanted line.  Nevertheless, these divisions are noticeable  */

+  /* in the overall performance because flattened curves produce a     */

+  /* very large number of slanted lines.                               */

 #define FT_UDIVPREP( c, b )                                                 \

   FT_Int64  b ## _r = c ? (FT_Int64)( ~(FT_UInt64)0 >> PIXEL_BITS ) / ( b ) \

                     : 0