X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=ttf2png.c;fp=ttf2png.c;h=bf9f8d2c728a78f41032078661b88de8960c7f46;hb=1fb6f37cfa76c47b65331b6fe8217f8973f35885;hp=5e6e351328e30b78f0b641ec867cda66d8313351;hpb=887d2514f9c7e57898cec5d598cd2a3bcd9ce757;p=ttf2png.git

diff --git a/ttf2png.c b/ttf2png.c
index 5e6e351..bf9f8d2 100644
--- a/ttf2png.c
+++ b/ttf2png.c
@@ -694,15 +694,9 @@ int copy_bitmap(const FT_Bitmap *bmp, Image *image)
 
 unsigned sqrti(unsigned num)
 {
-	unsigned result = num;
-	while(result*result>num)
-	{
-		unsigned diff = result*result-num;
-		if(diff<result)
-			break;
-
-		result -= (diff+result)/(result*2);
-	}
+	unsigned result = (num>0xFFFF ? 0xFFFF : 0x100);
+	while(result && result*result>=result+num)
+		result -= (result*result+result-num)/(result*2);
 
 	return result;
 }
@@ -740,7 +734,7 @@ unsigned find_distance_to_edge(const Image *image, int origin_x, int origin_y, u
 		}
 	}
 
-	return sqrti(closest)*0x7F/range;
+	return sqrti(closest*0x3F01)/range;
 }
 
 int create_distance_field(const FT_Bitmap *bmp, Image *image, unsigned scale, unsigned margin)