ref: c3135e43f54a3694a4ac476d3c6ee49a2e6d332f
parent: 3a0844c8ef274a1dff8594164579a093435fb286
author: Werner Lemberg <[email protected]>
date: Mon May 2 02:04:15 EDT 2011
[autofit] Fix and add comments.
--- a/src/autofit/aflatin.c
+++ b/src/autofit/aflatin.c
@@ -614,7 +614,7 @@
}
/* an extra-light axis corresponds to a standard width that is */
- /* smaller than 0.75 pixels */
+ /* smaller than 5/8 pixels */
axis->extra_light =
(FT_Bool)( FT_MulFix( axis->standard_width, scale ) < 32 + 8 );
@@ -1059,7 +1059,7 @@
/* */
/*********************************************************************/
- /* assure that edge distance threshold is at least 0.25px */
+ /* assure that edge distance threshold is at most 0.25px */
edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold,
scale );
if ( edge_distance_threshold > 64 / 4 )
@@ -1787,7 +1787,7 @@
for ( edge = edges; edge < edge_limit; edge++ )
{AF_Width blue;
- AF_Edge edge1, edge2;
+ AF_Edge edge1, edge2; /* these edges form the stem to check */
if ( edge->flags & AF_EDGE_DONE )
@@ -1800,6 +1800,7 @@
if ( blue )
edge1 = edge;
+ /* flip edges if the other stem is aligned to a blue zone */
else if ( edge2 && edge2->blue_edge )
{blue = edge2->blue_edge;
@@ -1829,8 +1830,8 @@
}
}
- /* now we align all stem edges, trying to maintain the */
- /* relative order of stems in the glyph */
+ /* now we align all other stem edges, trying to maintain the */
+ /* relative order of stems in the glyph */
for ( edge = edges; edge < edge_limit; edge++ )
{AF_Edge edge2;
@@ -1861,6 +1862,8 @@
if ( !anchor )
{+ /* if we reach this if clause, no stem has been aligned yet */
+
FT_Pos org_len, org_center, cur_len;
FT_Pos cur_pos1, error1, error2, u_off, d_off;
@@ -1871,14 +1874,18 @@
(AF_Edge_Flags)edge->flags,
(AF_Edge_Flags)edge2->flags );
- /* some voodoo to specially round edges for small stem widths */
+ /* some voodoo to specially round edges for small stem widths; */
+ /* the idea is to align the center of a stem, then shifting */
+ /* the stem edges to suitable positions */
if ( cur_len <= 64 )
{+ /* width <= 1px */
u_off = 32;
d_off = 32;
}
else
{+ /* 1px < width < 1.5px */
u_off = 38;
d_off = 26;
}
--- a/src/autofit/aflatin2.c
+++ b/src/autofit/aflatin2.c
@@ -594,7 +594,7 @@
}
/* an extra-light axis corresponds to a standard width that is */
- /* smaller than 0.75 pixels */
+ /* smaller than 5/8 pixels */
axis->extra_light =
(FT_Bool)( FT_MulFix( axis->standard_width, scale ) < 32 + 8 );