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* src/pshinter/pshalgo3.c (ps3_hints_apply): Try to optimize 

y_scale so that the top of non-capital letters is aligned on a pixel
boundary whenever possible.

* src/autohint/ahhint.c (ah_hint_edges): Make sure that lowercase
m's maintain their symmetry.
This commit is contained in:
Werner Lemberg 2003-05-20 05:01:49 +00:00
parent 98ceccab51
commit 6bd1c6d293
3 changed files with 95 additions and 0 deletions
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9
ChangeLog
View File

@ -1,3 +1,12 @@
2003-05-20 David Chester <davidchester@qmx.net>
* src/pshinter/pshalgo3.c (ps3_hints_apply): Try to optimize
y_scale so that the top of non-capital letters is aligned on a pixel
boundary whenever possible.
* src/autohint/ahhint.c (ah_hint_edges): Make sure that lowercase
m's maintain their symmetry.
2003-05-20 Werner Lemberg <wl@gnu.org>
* src/autohint/ahhint.c (ah_hinter_load_glyph): Oops! David's

59
src/autohint/ahhint.c
View File

@ -428,6 +428,7 @@
AH_Edge edge_limit;
AH_Outline outline = hinter->glyph;
FT_Int dimension;
FT_Int n_edges;
edges = outline->horz_edges;
@ -687,6 +688,64 @@
}
}
/* make sure that lowercase m's maintain their symmetry */
/* In general, lowercase m's have six vertical edges if they are sans */
/* serif, or twelve if they are avec serif. This implementation is */
/* based on that assumption, and seems to work very well with most */
/* faces. However, if for a certain face this assumption is not */
/* true, the m is just rendered like before. In addition, any stem */
/* correction will only be applied to symmetrical glyphs (even if the */
/* glyph is not an m), so the potential for unwanted distortion is */
/* relatively low. */
n_edges = edge_limit - edges;
if ( !dimension && ( n_edges == 6 || n_edges == 12 ) )
{
AH_EdgeRec *edge1, *edge2, *edge3;
FT_Pos dist1, dist2, span, delta;
if ( n_edges == 6 )
{
edge1 = edges;
edge2 = edges + 2;
edge3 = edges + 4;
}
else
{
edge1 = edges + 1;
edge2 = edges + 5;
edge3 = edges + 9;
}
dist1 = edge2->opos - edge1->opos;
dist2 = edge3->opos - edge2->opos;
span = dist1 - dist2;
if ( span < 0 )
span = -span;
if ( span < 8 )
{
delta = edge3->pos - ( 2 * edge2->pos - edge1->pos );
edge3->pos -= delta;
if ( edge3->link )
edge3->link->pos -= delta;
/* move the serifs along with the stem */
if ( n_edges == 12 )
{
( edges + 8 )->pos -= delta;
( edges + 11 )->pos -= delta;
}
edge3->flags |= AH_EDGE_DONE;
if ( edge3->link )
edge3->link->flags |= AH_EDGE_DONE;
}
}
if ( !has_serifs )
goto Next_Dimension;

27
src/pshinter/pshalgo3.c
View File

@ -1915,6 +1915,33 @@
if ( error )
goto Exit;
/* try to optimize the y_scale so that the top of non-capital letters
* is aligned on a pixel boundary whenever possible
*/
{
PSH_Dimension dim_x = &glyph->globals->dimension[0];
PSH_Dimension dim_y = &glyph->globals->dimension[1];
FT_Fixed x_scale = dim_x->scale_mult;
FT_Fixed y_scale = dim_y->scale_mult;
FT_Fixed scaled;
FT_Fixed fitted;
scaled = FT_MulFix( globals->blues.normal_top.zones->org_ref, y_scale );
fitted = ( scaled + 32 ) & -64;
if (scaled != fitted ) {
y_scale = FT_MulDiv( y_scale, fitted, scaled );
if ( fitted < scaled )
x_scale -= x_scale / 50;
psh_globals_set_scale( glyph->globals, x_scale, y_scale, 0, 0 );
}
}
glyph->do_horz_hints = 1;
glyph->do_vert_hints = 1;