From 493aa68f5c4cb2e659570809931539dc1987630c Mon Sep 17 00:00:00 2001 From: Werner Lemberg Date: Fri, 21 Sep 2018 08:32:22 +0200 Subject: [PATCH] [base] Some comments. --- src/base/ftobjs.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/src/base/ftobjs.c b/src/base/ftobjs.c index 6509a4ab8..608c4783b 100644 --- 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 ) @@ -404,9 +406,14 @@ 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 ) { if ( pbox.yMax - pbox.yMin == 0 )