From: Mikko Rasa <tdb@tdb.fi>
Date: Thu, 3 May 2018 10:06:26 +0000 (+0300)
Subject: Fix scaling of font ascent and descent
X-Git-Url: http://git.tdb.fi/?p=ttf2png.git;a=commitdiff_plain;h=95a574b6cbf90e1ceee50a71643fc1bec43f554a

Fix scaling of font ascent and descent

Descent value is often negative and right-shifting a negative value is
implementation-defined.  Best to avoid it.

Also round descent down instead of up.
---

diff --git a/ttf2png.c b/ttf2png.c
index 42125ad..d7079d5 100644
--- a/ttf2png.c
+++ b/ttf2png.c
@@ -501,8 +501,8 @@ int init_font(Font *font, FT_Face face, const Range *ranges, unsigned n_ranges,
 	unsigned i, j;
 	unsigned size = 0;
 
-	font->ascent = (face->size->metrics.ascender+63)>>6;
-	font->descent = (face->size->metrics.descender+63)>>6;
+	font->ascent = (face->size->metrics.ascender+63)/64;
+	font->descent = (face->size->metrics.descender-63)/64;
 
 	if(verbose>=1)
 	{