forked from minhngoc25a/freetype2
* src/pshinter/pshalgo.c (PSH_STRONG_THRESHOLD): Changed to hold
the accepted shift for strong points in fractional pixels (which is a heuristic value). (psh_glyph_find_strong_points): Compute threshold for psh_hint_table_find_strong_points. (psh_hint_table_find_strong_point): Add parameter to pass threshold.
This commit is contained in:
Werner Lemberg
parent
a6498eff0f
commit
849b62bf38
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@ -1,3 +1,12 @@
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2004-02-21 Werner Lemberg <wl@gnu.org>
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* src/pshinter/pshalgo.c (PSH_STRONG_THRESHOLD): Changed to hold
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the accepted shift for strong points in fractional pixels (which
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is a heuristic value).
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(psh_glyph_find_strong_points): Compute threshold for
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psh_hint_table_find_strong_points.
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(psh_hint_table_find_strong_point): Add parameter to pass threshold.
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2004-02-20 Werner Lemberg <wl@gnu.org>
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* src/pshinter/pshrec.c (ps_mask_table_set_bits): Don't call
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@ -1368,9 +1368,6 @@
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}
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#define PSH_STRONG_THRESHOLD 30
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/* major_dir is the direction for points on the bottom/left of the stem; */
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/* Points on the top/right of the stem will have a direction of */
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/* -major_dir. */
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@ -1378,6 +1375,7 @@
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static void
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psh_hint_table_find_strong_point( PSH_Hint_Table table,
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PSH_Point point,
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FT_Int threshold,
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FT_Int major_dir )
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{
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PSH_Hint* sort = table->sort;
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@ -1407,7 +1405,7 @@
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flag = PSH_POINT_EDGE_MIN;
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d = point->org_u - hint->org_pos;
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if ( ABS( d ) < PSH_STRONG_THRESHOLD )
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if ( ABS( d ) < threshold )
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{
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Is_Strong:
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psh_point_set_strong( point );
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@ -1421,7 +1419,7 @@
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flag = PSH_POINT_EDGE_MAX;
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d = point->org_u - hint->org_pos - hint->org_len;
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if ( ABS( d ) < PSH_STRONG_THRESHOLD )
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if ( ABS( d ) < threshold )
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goto Is_Strong;
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}
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}
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@ -1457,7 +1455,7 @@
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flag = PSH_POINT_EDGE_MIN;
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d = point->org_u - hint->org_pos;
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if ( ABS( d ) < PSH_STRONG_THRESHOLD )
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if ( ABS( d ) < threshold )
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{
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Is_Strong2:
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point->flags2 |= flag;
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@ -1471,7 +1469,7 @@
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flag = PSH_POINT_EDGE_MAX;
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d = point->org_u - hint->org_pos - hint->org_len;
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if ( ABS( d ) < PSH_STRONG_THRESHOLD )
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if ( ABS( d ) < threshold )
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goto Is_Strong2;
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}
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@ -1487,6 +1485,10 @@
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}
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/* the accepted shift for strong points in fractional pixels */
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#define PSH_STRONG_THRESHOLD 50
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/* find strong points in a glyph */
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static void
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psh_glyph_find_strong_points( PSH_Glyph glyph,
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@ -1494,68 +1496,74 @@
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{
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/* a point is strong if it is located on a stem */
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/* edge and has an "in" or "out" tangent to the hint's direction */
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PSH_Hint_Table table = &glyph->hint_tables[dimension];
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PS_Mask mask = table->hint_masks->masks;
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FT_UInt num_masks = table->hint_masks->num_masks;
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FT_UInt first = 0;
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FT_Int major_dir = dimension == 0 ? PSH_DIR_VERTICAL
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: PSH_DIR_HORIZONTAL;
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PSH_Dimension dim = &glyph->globals->dimension[dimension];
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FT_Fixed scale = dim->scale_mult;
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FT_Int threshold;
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threshold = (FT_Int)FT_DivFix( PSH_STRONG_THRESHOLD, scale );
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/* process secondary hints to "selected" points */
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if ( num_masks > 1 && glyph->num_points > 0 )
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{
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PSH_Hint_Table table = &glyph->hint_tables[dimension];
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PS_Mask mask = table->hint_masks->masks;
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FT_UInt num_masks = table->hint_masks->num_masks;
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FT_UInt first = 0;
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FT_Int major_dir = dimension == 0 ? PSH_DIR_VERTICAL
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: PSH_DIR_HORIZONTAL;
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/* process secondary hints to "selected" points */
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if ( num_masks > 1 && glyph->num_points > 0 )
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first = mask->end_point;
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mask++;
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for ( ; num_masks > 1; num_masks--, mask++ )
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{
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first = mask->end_point;
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mask++;
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for ( ; num_masks > 1; num_masks--, mask++ )
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FT_UInt next;
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FT_Int count;
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next = mask->end_point;
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count = next - first;
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if ( count > 0 )
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{
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FT_UInt next;
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FT_Int count;
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PSH_Point point = glyph->points + first;
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next = mask->end_point;
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count = next - first;
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if ( count > 0 )
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{
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PSH_Point point = glyph->points + first;
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psh_hint_table_activate_mask( table, mask );
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psh_hint_table_activate_mask( table, mask );
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for ( ; count > 0; count--, point++ )
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psh_hint_table_find_strong_point( table, point, major_dir );
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}
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first = next;
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for ( ; count > 0; count--, point++ )
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psh_hint_table_find_strong_point( table, point,
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threshold, major_dir );
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}
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first = next;
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}
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}
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/* process primary hints for all points */
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if ( num_masks == 1 )
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/* process primary hints for all points */
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if ( num_masks == 1 )
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{
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FT_UInt count = glyph->num_points;
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PSH_Point point = glyph->points;
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psh_hint_table_activate_mask( table, table->hint_masks->masks );
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for ( ; count > 0; count--, point++ )
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{
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FT_UInt count = glyph->num_points;
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PSH_Point point = glyph->points;
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psh_hint_table_activate_mask( table, table->hint_masks->masks );
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for ( ; count > 0; count--, point++ )
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{
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if ( !psh_point_is_strong( point ) )
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psh_hint_table_find_strong_point( table, point, major_dir );
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}
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if ( !psh_point_is_strong( point ) )
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psh_hint_table_find_strong_point( table, point,
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threshold, major_dir );
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}
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}
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/* now, certain points may have been attached to hint and */
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/* not marked as strong; update their flags then */
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{
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FT_UInt count = glyph->num_points;
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PSH_Point point = glyph->points;
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/* now, certain points may have been attached to hint and */
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/* not marked as strong; update their flags then */
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{
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FT_UInt count = glyph->num_points;
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PSH_Point point = glyph->points;
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for ( ; count > 0; count--, point++ )
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if ( point->hint && !psh_point_is_strong( point ) )
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psh_point_set_strong( point );
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}
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for ( ; count > 0; count--, point++ )
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if ( point->hint && !psh_point_is_strong( point ) )
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psh_point_set_strong( point );
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}
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}
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@ -1568,50 +1576,45 @@
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PSH_Dimension dim = &glyph->globals->dimension[dimension];
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FT_Fixed scale = dim->scale_mult;
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FT_UInt count = glyph->num_points;
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PSH_Point point = glyph->points;
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for ( ; count > 0; count--, point++ )
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{
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FT_UInt count = glyph->num_points;
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PSH_Point point = glyph->points;
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PSH_Hint hint = point->hint;
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for ( ; count > 0; count--, point++ )
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if ( hint )
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{
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PSH_Hint hint = point->hint;
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FT_Pos delta;
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if ( hint )
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if ( psh_point_is_edge_min( point ) )
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point->cur_u = hint->cur_pos;
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else if ( psh_point_is_edge_max( point ) )
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point->cur_u = hint->cur_pos + hint->cur_len;
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else
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{
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FT_Pos delta;
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delta = point->org_u - hint->org_pos;
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if ( delta <= 0 )
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point->cur_u = hint->cur_pos + FT_MulFix( delta, scale );
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if ( psh_point_is_edge_min( point ) )
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{
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point->cur_u = hint->cur_pos;
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}
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else if ( psh_point_is_edge_max( point ) )
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{
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point->cur_u = hint->cur_pos + hint->cur_len;
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}
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else if ( delta >= hint->org_len )
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point->cur_u = hint->cur_pos + hint->cur_len +
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FT_MulFix( delta - hint->org_len, scale );
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else if ( hint->org_len > 0 )
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point->cur_u = hint->cur_pos +
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FT_MulDiv( delta, hint->cur_len,
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hint->org_len );
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else
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{
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delta = point->org_u - hint->org_pos;
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if ( delta <= 0 )
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point->cur_u = hint->cur_pos + FT_MulFix( delta, scale );
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else if ( delta >= hint->org_len )
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point->cur_u = hint->cur_pos + hint->cur_len +
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FT_MulFix( delta - hint->org_len, scale );
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else if ( hint->org_len > 0 )
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point->cur_u = hint->cur_pos +
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FT_MulDiv( delta, hint->cur_len,
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hint->org_len );
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else
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point->cur_u = hint->cur_pos;
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}
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psh_point_set_fitted( point );
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point->cur_u = hint->cur_pos;
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}
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psh_point_set_fitted( point );
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}
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}
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}
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@ -1623,109 +1626,107 @@
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{
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#if 1
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/* first technique: a point is strong if it is a local extrema */
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PSH_Dimension dim = &glyph->globals->dimension[dimension];
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FT_Fixed scale = dim->scale_mult;
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FT_UInt count = glyph->num_points;
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PSH_Point point = glyph->points;
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/* first technique: a point is strong if it is a local extrema */
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for ( ; count > 0; count--, point++ )
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{
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FT_UInt count = glyph->num_points;
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PSH_Point point = glyph->points;
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if ( psh_point_is_strong( point ) )
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continue;
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for ( ; count > 0; count--, point++ )
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/* sometimes, some local extremas are smooth points */
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if ( psh_point_is_smooth( point ) )
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{
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if ( psh_point_is_strong( point ) )
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if ( point->dir_in == PSH_DIR_NONE ||
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point->dir_in != point->dir_out )
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continue;
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/* sometimes, some local extremas are smooth points */
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if ( psh_point_is_smooth( point ) )
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if ( !psh_point_is_extremum( point ) &&
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!psh_point_is_inflex( point ) )
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continue;
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point->flags &= ~PSH_POINT_SMOOTH;
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}
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/* find best enclosing point coordinates */
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{
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PSH_Point before = 0;
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PSH_Point after = 0;
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FT_Pos diff_before = -32000;
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FT_Pos diff_after = 32000;
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FT_Pos u = point->org_u;
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FT_Int count2 = glyph->num_points;
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PSH_Point cur = glyph->points;
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for ( ; count2 > 0; count2--, cur++ )
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{
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if ( point->dir_in == PSH_DIR_NONE ||
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point->dir_in != point->dir_out )
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continue;
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if ( !psh_point_is_extremum( point ) &&
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!psh_point_is_inflex( point ) )
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continue;
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point->flags &= ~PSH_POINT_SMOOTH;
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}
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/* find best enclosing point coordinates */
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{
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PSH_Point before = 0;
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PSH_Point after = 0;
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FT_Pos diff_before = -32000;
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FT_Pos diff_after = 32000;
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FT_Pos u = point->org_u;
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FT_Int count2 = glyph->num_points;
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PSH_Point cur = glyph->points;
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for ( ; count2 > 0; count2--, cur++ )
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if ( psh_point_is_strong( cur ) )
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{
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if ( psh_point_is_strong( cur ) )
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FT_Pos diff = cur->org_u - u;;
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if ( diff <= 0 )
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{
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FT_Pos diff = cur->org_u - u;;
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if ( diff <= 0 )
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if ( diff > diff_before )
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{
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if ( diff > diff_before )
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{
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diff_before = diff;
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before = cur;
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}
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diff_before = diff;
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before = cur;
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}
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else if ( diff >= 0 )
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}
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else if ( diff >= 0 )
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{
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if ( diff < diff_after )
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{
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if ( diff < diff_after )
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{
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diff_after = diff;
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after = cur;
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}
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diff_after = diff;
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after = cur;
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}
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}
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}
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}
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if ( !before )
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{
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if ( !after )
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continue;
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if ( !before )
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{
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if ( !after )
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continue;
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/* we are before the first strong point coordinate; */
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/* simply translate the point */
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point->cur_u = after->cur_u +
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/* we are before the first strong point coordinate; */
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/* simply translate the point */
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point->cur_u = after->cur_u +
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FT_MulFix( point->org_u - after->org_u, scale );
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}
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else if ( !after )
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{
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/* we are after the last strong point coordinate; */
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/* simply translate the point */
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point->cur_u = before->cur_u +
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}
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else if ( !after )
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{
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/* we are after the last strong point coordinate; */
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/* simply translate the point */
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point->cur_u = before->cur_u +
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FT_MulFix( point->org_u - before->org_u, scale );
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}
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}
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else
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{
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if ( diff_before == 0 )
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point->cur_u = before->cur_u;
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else if ( diff_after == 0 )
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point->cur_u = after->cur_u;
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else
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{
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if ( diff_before == 0 )
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point->cur_u = before->cur_u;
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else if ( diff_after == 0 )
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point->cur_u = after->cur_u;
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else
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point->cur_u = before->cur_u +
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point->cur_u = before->cur_u +
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FT_MulDiv( u - before->org_u,
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after->cur_u - before->cur_u,
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after->org_u - before->org_u );
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}
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psh_point_set_fitted( point );
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}
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psh_point_set_fitted( point );
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}
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}
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