From dc56acaec174575c5c27f6135a40abca511bc88e Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Fri, 23 Nov 2012 15:34:58 +0200
Subject: [PATCH] Fix the logic for determining grid range

---
 ttf2png.c | 22 +++++++---------------
 1 file changed, 7 insertions(+), 15 deletions(-)

diff --git a/ttf2png.c b/ttf2png.c
index ebc9530..7e78e84 100644
--- a/ttf2png.c
+++ b/ttf2png.c
@@ -362,14 +362,6 @@ void render_grid(Font *font, unsigned cellw, unsigned cellh, unsigned cpl, int s
 	unsigned first, last;
 	unsigned maxw = 0, maxh = 0;
 
-	for(i=1;; i<<=1)
-	{
-		first = font->glyphs[0].code&~(i-1);
-		last = first+i-1;
-		if(last>=font->glyphs[font->n_glyphs-1].code)
-			break;
-	}
-
 	for(i=0; i<font->n_glyphs; ++i)
 	{
 		int y;
@@ -410,21 +402,21 @@ void render_grid(Font *font, unsigned cellw, unsigned cellh, unsigned cpl, int s
 
 	if(cpl==0)
 	{
-		unsigned count = (seq ? font->n_glyphs : last-first+1);
 		for(i=1;; i<<=1)
 		{
 			cpl = i/cellw;
-			if(cpl>0 && (count+cpl-1)/cpl*cellh<=cpl*cellw)
+			if(cpl>0 && font->n_glyphs/cpl*cellh<=cpl*cellw)
 				break;
 		}
 	}
 
+	first = font->glyphs[0].code;
+	if(!seq)
+		first -= first%cpl;
+	last = font->glyphs[font->n_glyphs-1].code;
+
 	font->image.w = round_to_pot(cpl*cellw);
-	if(seq && font->n_glyphs<last-first+1)
-		font->image.h = (font->n_glyphs+cpl-1)/cpl*cellh;
-	else
-		font->image.h = (last-first+cpl)/cpl*cellh;
-	font->image.h = round_to_pot(font->image.h);
+	font->image.h = round_to_pot((last-first+cpl)/cpl*cellh);
 
 	font->image.data = (char *)malloc(font->image.w*font->image.h);
 	memset(font->image.data, 255, font->image.w*font->image.h);
-- 
2.43.0