[smooth] Switch to vertical bisections.
With horizontal bisections, the smallest section is a whole single
scanline. Almost horizontal lines or other complex scanlines can
easily overflow the rendering pool. Switching to vertical bisections
splits the scanlines and should rule out the overflows. Fixes #1269.
* src/smooth/ftgrays.c (gray_convert_glyph): Bisect vertically.
diff --git a/src/smooth/ftgrays.c b/src/smooth/ftgrays.c
index 3345e79..f011e9f 100644
--- a/src/smooth/ftgrays.c
+++ b/src/smooth/ftgrays.c
@@ -1892,18 +1892,17 @@
height = ( height + n - 1 ) / n;
}
- ras.min_ex = ras.cbox.xMin;
- ras.max_ex = ras.cbox.xMax;
-
for ( y = ras.cbox.yMin; y < ras.cbox.yMax; )
{
ras.min_ey = y;
y += height;
ras.max_ey = FT_MIN( y, ras.cbox.yMax );
+ ras.count_ey = ras.max_ey - ras.min_ey;
+
band = bands;
- band[1] = ras.min_ey;
- band[0] = ras.max_ey;
+ band[1] = ras.cbox.xMin;
+ band[0] = ras.cbox.xMax;
do
{
@@ -1911,10 +1910,8 @@
int error;
- ras.min_ey = band[1];
- ras.max_ey = band[0];
-
- ras.count_ey = ras.max_ey - ras.min_ey;
+ ras.min_ex = band[1];
+ ras.max_ex = band[0];
/* memory management: zero out and skip ycells */
for ( i = 0; i < ras.count_ey; ++i )
