Commit 2a9c4552f6b80838e2024486620ce220c0405398
2012-07-03T11:54:12
[autofit] Quantize stem widths. * src/autofit/afangles.c (af_sort_widths): Rename to... (af_sort_and_quantize_widths): This. Add code to avoid stem widths which are almost identical. * src/autofit/aftypes.h, src/autofit/aflatin.c, src/autofit/afcjk.c: Updated.
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diff --git a/ChangeLog b/ChangeLog
index 0e06873..dbe75d8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,15 @@
2012-07-03 Werner Lemberg <wl@gnu.org>
+ [autofit] Quantize stem widths.
+
+ * src/autofit/afangles.c (af_sort_widths): Rename to...
+ (af_sort_and_quantize_widths): This.
+ Add code to avoid stem widths which are almost identical.
+ * src/autofit/aftypes.h, src/autofit/aflatin.c, src/autofit/afcjk.c:
+ Updated.
+
+2012-07-03 Werner Lemberg <wl@gnu.org>
+
[autofit] Minor speed-up.
* src/autofit/afangles (af_sort_pos, af_sort_widths): Don't swap
diff --git a/src/autofit/afangles.c b/src/autofit/afangles.c
index 653d3f6..b44a5ba 100644
--- a/src/autofit/afangles.c
+++ b/src/autofit/afangles.c
@@ -267,14 +267,22 @@
FT_LOCAL_DEF( void )
- af_sort_widths( FT_UInt count,
- AF_Width table )
+ af_sort_and_quantize_widths( FT_UInt* count,
+ AF_Width table,
+ FT_Pos threshold )
{
FT_UInt i, j;
+ FT_UInt cur_idx;
+ FT_Pos cur_val;
+ FT_Pos sum;
AF_WidthRec swap;
- for ( i = 1; i < count; i++ )
+ if ( *count == 1 )
+ return;
+
+ /* sort */
+ for ( i = 1; i < *count; i++ )
{
for ( j = i; j > 0; j-- )
{
@@ -286,6 +294,51 @@
table[j - 1] = swap;
}
}
+
+ cur_idx = 0;
+ cur_val = table[cur_idx].org;
+
+ /* compute and use mean values for clusters not larger than */
+ /* `threshold'; this is very primitive and might not yield */
+ /* the best result, but normally, using reference character */
+ /* `o', `*count' is 2, so the code below is fully sufficient */
+ for ( i = 1; i < *count; i++ )
+ {
+ if ( table[i].org - cur_val > threshold ||
+ i == *count - 1 )
+ {
+ sum = 0;
+
+ /* fix loop for end of array */
+ if ( table[i].org - cur_val <= threshold &&
+ i == *count - 1 )
+ i++;
+
+ for ( j = cur_idx; j < i; j++ )
+ {
+ sum += table[j].org;
+ table[j].org = 0;
+ }
+ table[cur_idx].org = sum / j;
+
+ if ( i < *count - 1 )
+ {
+ cur_idx = i + 1;
+ cur_val = table[cur_idx].org;
+ }
+ }
+ }
+
+ cur_idx = 1;
+
+ /* compress array to remove zero values */
+ for ( i = 1; i < *count; i++ )
+ {
+ if ( table[i].org )
+ table[cur_idx++] = table[i];
+ }
+
+ *count = cur_idx;
}
diff --git a/src/autofit/afcjk.c b/src/autofit/afcjk.c
index 8e407c8..5b47a7f 100644
--- a/src/autofit/afcjk.c
+++ b/src/autofit/afcjk.c
@@ -150,7 +150,10 @@
}
}
- af_sort_widths( num_widths, axis->widths );
+ /* this also replaces multiple almost identical stem widths */
+ /* with a single one (the value 100 is heuristic) */
+ af_sort_and_quantize_widths( &num_widths, axis->widths,
+ dummy->units_per_em / 100 );
axis->width_count = num_widths;
}
diff --git a/src/autofit/aflatin.c b/src/autofit/aflatin.c
index 0fd3045..6ef0dba 100644
--- a/src/autofit/aflatin.c
+++ b/src/autofit/aflatin.c
@@ -138,7 +138,10 @@
}
}
- af_sort_widths( num_widths, axis->widths );
+ /* this also replaces multiple almost identical stem widths */
+ /* with a single one (the value 100 is heuristic) */
+ af_sort_and_quantize_widths( &num_widths, axis->widths,
+ dummy->units_per_em / 100 );
axis->width_count = num_widths;
}
diff --git a/src/autofit/aftypes.h b/src/autofit/aftypes.h
index 21e442c..fd2bbdc 100644
--- a/src/autofit/aftypes.h
+++ b/src/autofit/aftypes.h
@@ -4,7 +4,7 @@
/* */
/* Auto-fitter types (specification only). */
/* */
-/* Copyright 2003-2009, 2011 by */
+/* Copyright 2003-2009, 2011-2012 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
@@ -87,8 +87,9 @@ extern void* _af_debug_hints;
FT_Pos* table );
FT_LOCAL( void )
- af_sort_widths( FT_UInt count,
- AF_Width widths );
+ af_sort_and_quantize_widths( FT_UInt* count,
+ AF_Width widths,
+ FT_Pos threshold );
/*************************************************************************/