ref: 493aa68f5c4cb2e659570809931539dc1987630c
parent: 2a9850c4fc2fd75021359346c9ffc7478f12d449
author: Werner Lemberg <[email protected]>
date: Fri Sep 21 04:32:22 EDT 2018
[base] Some comments.
--- a/src/base/ftobjs.c
+++ b/src/base/ftobjs.c
@@ -391,8 +391,10 @@
case FT_RENDER_MODE_MONO:
pixel_mode = FT_PIXEL_MODE_MONO;
#if 1
- /* undocumented but confirmed: bbox values get rounded */
- /* for narrow glyphs bbox is extended to one pixel first */
+ /* x */
+
+ /* undocumented but confirmed: bbox values get rounded; */
+ /* for narrow glyphs bbox is extended to one pixel first */
if ( pbox.xMax - pbox.xMin <= 1 )
{if ( pbox.xMax - pbox.xMin == 0 )
@@ -404,8 +406,13 @@
cbox.xMin = cbox.xMax = ( cbox.xMin + cbox.xMax ) / 2;
}
+ /* we do asymmetric rounding so that the center */
+ /* of a pixel gets always included */
+
pbox.xMin += ( cbox.xMin + 31 ) >> 6;
pbox.xMax += ( cbox.xMax + 32 ) >> 6;
+
+ /* y */
if ( pbox.yMax - pbox.yMin <= 1 )
{