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2002-07-03 David Turner <david@freetype.org> 

* src/autohint/ahglobal.c, src/autohint/ahtypes.h, src/autohint/ahhint.c:
    small improvements to the automatic hinter. un-even stem-widths have now
    disappeared and everything looks much better, even if there are still
    issues with serifed fonts.
This commit is contained in:
David Turner 2002-07-04 22:48:12 +00:00
parent 9f7d079c89
commit 699053ca75
4 changed files with 143 additions and 39 deletions
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13
ChangeLog
View File

@ -1,3 +1,16 @@
2002-07-03 David Turner <david@freetype.org>
* src/autohint/ahglobal.c, src/autohint/ahtypes.h, src/autohint/ahhint.c:
small improvements to the automatic hinter. un-even stem-widths have now
disappeared and everything looks much better, even if there are still
issues with serifed fonts.
2002-07-03 Owen Taylor <owen@redhat.com>
* src/pshinter/pshalgo3.c, src/pshinter/pshalgo3.h, src/pshinter/pshalgo.h,
src/pshinter/pshinter.c: adding new algorithm based on Owen Taylor's recent
work
2002-07-01 Owen Taylor <owen@redhat.com>
* src/pshinter/pshalgo2.c (psh2_glyph_find_strong_points): fix a bug

1
src/autohint/ahglobal.c
View File

@ -368,7 +368,6 @@
limit = segments + outline->num_vsegments;
widths = globals->widths;
p_num_widths = &globals->num_widths;
}
/* Now, compute the edge distance threshold as a fraction of the */

146
src/autohint/ahhint.c
View File

@ -30,7 +30,7 @@
#define FACE_GLOBALS( face ) ((AH_Face_Globals*)(face)->autohint.data)
#define AH_USE_IUP
#define OPTIM_STEM_SNAP
/*************************************************************************/
/*************************************************************************/
@ -51,6 +51,7 @@
int n;
FT_Pos best = 64 + 32 + 2;
FT_Pos reference = width;
FT_Pos scaled;
for ( n = 0; n < count; n++ )
@ -70,16 +71,16 @@
}
}
scaled = (reference+32) & -64;
if ( width >= reference )
{
width -= 0x21;
if ( width < reference )
if ( width < scaled + 48 )
width = reference;
}
else
{
width += 0x21;
if ( width > reference )
if ( width > scaled - 48 )
width = reference;
}
@ -87,24 +88,62 @@
}
/* align one stem edge relative to the previous stem edge */
static void
ah_align_linked_edge( AH_Hinter* hinter,
AH_Edge* base_edge,
AH_Edge* stem_edge,
int vertical )
/* compute the snapped width of a given stem */
static FT_Pos
ah_compute_stem_width( AH_Hinter* hinter,
int vertical,
FT_Pos width )
{
FT_Pos dist = stem_edge->opos - base_edge->opos;
AH_Globals* globals = &hinter->globals->scaled;
FT_Pos sign = 1;
FT_Pos dist = width;
FT_Int sign = 0;
if ( dist < 0 )
{
dist = -dist;
sign = -1;
dist = -width;
sign = 1;
}
#if 1
if ( dist < 64 )
dist = 64;
{
FT_Pos delta = dist - globals->stds[vertical];
if ( delta < 0 )
delta = -delta;
if ( delta < 40 )
{
dist = globals->stds[vertical];
if ( dist < 32 )
dist = 32;
}
{
if ( dist < 3*64 )
{
delta = (dist & 63);
dist &= -64;
if ( delta < 10 )
dist += delta;
else if ( delta < 32 )
dist += 10;
else if ( delta < 54 )
dist += 54;
else
dist += delta;
}
else
dist = (dist+32) & -64;
}
}
#else
if ( vertical )
{
dist = ah_snap_width( globals->heights, globals->num_heights, dist );
@ -138,14 +177,32 @@
dist = ( dist + 64 ) >> 1;
else if ( dist < 128 )
dist = ( dist + 42 ) & -64;
dist = ( dist + 22 ) & -64;
else
/* XXX: round otherwise, prevent color fringes in LCD mode */
dist = ( dist + 32 ) & -64;
}
}
#endif
stem_edge->pos = base_edge->pos + sign * dist;
if ( sign )
dist = -dist;
return dist;
}
/* align one stem edge relative to the previous stem edge */
static void
ah_align_linked_edge( AH_Hinter* hinter,
AH_Edge* base_edge,
AH_Edge* stem_edge,
int vertical )
{
FT_Pos dist = stem_edge->opos - base_edge->opos;
stem_edge->pos = base_edge->pos +
ah_compute_stem_width( hinter, vertical, dist );
}
@ -168,6 +225,10 @@
sign = -1;
}
#if 0
if ( dist < 32 )
dist = 32;
#else
/* do not strengthen serifs */
if ( base->flags & ah_edge_done )
{
@ -179,6 +240,7 @@
else
dist = 0;
}
#endif
serif->pos = base->pos + sign * dist;
}
@ -308,20 +370,43 @@
{
edge->pos = ( edge->opos + 32 ) & -64;
anchor = edge;
}
else
edge->pos = anchor->pos +
( ( edge->opos - anchor->opos + 32 ) & -64 );
edge->flags |= ah_edge_done;
if ( edge > edges && edge->pos < edge[-1].pos )
{
edge->pos = edge[-1].pos;
min = 1;
}
ah_align_linked_edge( hinter, edge, edge2, dimension );
}
else
{
FT_Pos org_pos, org_len, org_center, cur_len;
FT_Pos cur_pos1, cur_pos2, delta1, delta2;
org_pos = anchor->pos + (edge->opos - anchor->opos);
org_len = edge2->opos - edge->opos;
org_center = org_pos + (org_len >> 1);
cur_len = ah_compute_stem_width( hinter, dimension, org_len );
cur_pos1 = ( org_pos + 32 ) & -64;
delta1 = ( cur_pos1 + (cur_len >> 1) - org_center );
if ( delta1 < 0 )
delta1 = -delta1;
cur_pos2 = (( org_pos + org_len + 32 ) & -64) - cur_len;
delta2 = ( cur_pos2 + (cur_len >> 1) - org_center );
if ( delta2 < 0 )
delta2 = -delta2;
edge->pos = ( delta1 <= delta2 ) ? cur_pos1 : cur_pos2;
edge2->pos = edge->pos + cur_len;
edge->flags |= ah_edge_done;
edge2->flags |= ah_edge_done;
if ( edge > edges && edge->pos < edge[-1].pos )
edge->pos = edge[-1].pos;
#if 0
delta = 0;
if ( edge2 + 1 < edge_limit &&
edge2[1].flags & ah_edge_done )
@ -334,6 +419,8 @@
edge->pos += delta;
}
edge2->flags |= ah_edge_done;
#endif
}
}
}
@ -855,6 +942,9 @@
for ( n = 0; n < design->num_heights; n++ )
scaled->heights[n] = FT_MulFix( design->heights[n], y_scale );
scaled->stds[0] = ( design->num_widths > 0 ) ? scaled->widths[0] : 32000;
scaled->stds[1] = ( design->num_heights > 0 ) ? scaled->heights[0] : 32000;
/* scale the blue zones */
for ( n = 0; n < ah_blue_max; n++ )
{

2
src/autohint/ahtypes.h
View File

@ -423,6 +423,8 @@ FT_BEGIN_HEADER
FT_Int num_widths;
FT_Int num_heights;
FT_Pos stds[2];
FT_Pos widths [AH_MAX_WIDTHS];
FT_Pos heights[AH_MAX_HEIGHTS];