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Code Issues 4 Releases Wiki Activity

* src/base/ftcalc.c (FT_DivFix): fixed a bug in the 64-bit code that 

created incorrect scale factors !!

    * src/autohint/ahglobal.c, src/autohint/ahglyph.c, src/autohint/ahhint.c:
    fixed the incorrect blue zone computations, and improved the composite
    support. Note that these changes result in improved rendering, while
    sometimes introducing their own artefacts. That's probably the last
    big change to the autohinter before the introduction of its complete
    replacement..
This commit is contained in:
David Turner 2001-05-14 14:04:23 +00:00
parent fdab085e25
commit 8e86015f39
5 changed files with 168 additions and 137 deletions
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12
ChangeLog
View File

@ -1,3 +1,15 @@
2001-05-14 David Turner <david@freetype.org>
* src/base/ftcalc.c (FT_DivFix): fixed a bug in the 64-bit code that
created incorrect scale factors !!
* src/autohint/ahglobal.c, src/autohint/ahglyph.c, src/autohint/ahhint.c:
fixed the incorrect blue zone computations, and improved the composite
support. Note that these changes result in improved rendering, while
sometimes introducing their own artefacts. That's probably the last
big change to the autohinter before the introduction of its complete
replacement..
2001-05-12 Werner Lemberg <wl@gnu.org>
* include/freetype/ftbbox.h: FTBBOX_H -> __FTBBOX_H__.

2
src/autohint/ahglobal.c
View File

@ -47,7 +47,7 @@
for ( i = 1; i < count; i++ )
{
for ( j = i; j > 1; j-- )
for ( j = i; j > 0; j-- )
{
if ( table[j] > table[j - 1] )
break;

264
src/autohint/ahglyph.c
View File

@ -28,7 +28,109 @@
#include <stdio.h>
#define xxxAH_DEBUG_GLYPH
#ifdef AH_DEBUG
void ah_dump_edges( AH_Outline* outline )
{
AH_Edge* edges;
AH_Edge* edge_limit;
AH_Segment* segments;
FT_Int dimension;
edges = outline->horz_edges;
edge_limit = edges + outline->num_hedges;
segments = outline->horz_segments;
for ( dimension = 1; dimension >= 0; dimension-- )
{
AH_Edge* edge;
printf ( "Table of %s edges:\n",
!dimension ? "vertical" : "horizontal" );
printf ( " [ index | pos | dir | link |"
" serif | blue | opos | pos ]\n" );
for ( edge = edges; edge < edge_limit; edge++ )
{
printf ( " [ %5d | %4d | %5s | %4d | %5d | %c | %5.2f | %5.2f ]\n",
edge - edges,
(int)edge->fpos,
edge->dir == ah_dir_up
? "up"
: ( edge->dir == ah_dir_down
? "down"
: ( edge->dir == ah_dir_left
? "left"
: ( edge->dir == ah_dir_right
? "right"
: "none" ) ) ),
edge->link ? ( edge->link - edges ) : -1,
edge->serif ? ( edge->serif - edges ) : -1,
edge->blue_edge ? 'y' : 'n',
edge->opos / 64.0,
edge->pos / 64.0 );
}
edges = outline->vert_edges;
edge_limit = edges + outline->num_vedges;
segments = outline->vert_segments;
}
}
/* A function used to dump the array of linked segments */
void ah_dump_segments( AH_Outline* outline )
{
AH_Segment* segments;
AH_Segment* segment_limit;
AH_Point* points;
FT_Int dimension;
points = outline->points;
segments = outline->horz_segments;
segment_limit = segments + outline->num_hsegments;
for ( dimension = 1; dimension >= 0; dimension-- )
{
AH_Segment* seg;
printf ( "Table of %s segments:\n",
!dimension ? "vertical" : "horizontal" );
printf ( " [ index | pos | dir | link | serif |"
" numl | first | start ]\n" );
for ( seg = segments; seg < segment_limit; seg++ )
{
printf ( " [ %5d | %4d | %5s | %4d | %5d | %4d | %5d | %5d ]\n",
seg - segments,
(int)seg->pos,
seg->dir == ah_dir_up
? "up"
: ( seg->dir == ah_dir_down
? "down"
: ( seg->dir == ah_dir_left
? "left"
: ( seg->dir == ah_dir_right
? "right"
: "none" ) ) ),
seg->link ? (seg->link-segments) : -1,
seg->serif ? (seg->serif-segments) : -1,
(int)seg->num_linked,
seg->first - points,
seg->last - points );
}
segments = outline->vert_segments;
segment_limit = segments + outline->num_vsegments;
}
}
#endif /* AH_DEBUG */
/* compute the direction value of a given vector.. */
@ -344,8 +446,6 @@
outline->num_hsegments = 0;
outline->num_vsegments = 0;
#if 1
/* We can't rely on the value of `FT_Outline.flags' to know the fill */
/* direction used for a glyph, given that some fonts are broken (e.g. */
/* the Arphic ones). We thus recompute it each time we need to. */
@ -359,23 +459,6 @@
outline->horz_major_dir = ah_dir_right;
}
#else /* !1 */
/* Compute the vertical and horizontal major directions; this is */
/* currently done by inspecting the `ft_outline_reverse_fill' flag. */
/* However, some fonts have improper glyphs, and it'd be a good idea */
/* to be able to re-compute these values on the fly. */
outline->vert_major_dir = ah_dir_up;
outline->horz_major_dir = ah_dir_left;
if ( source->flags & ft_outline_reverse_fill )
{
outline->vert_major_dir = ah_dir_down;
outline->horz_major_dir = ah_dir_right;
}
#endif /* !1 */
outline->x_scale = face->size->metrics.x_scale;
outline->y_scale = face->size->metrics.y_scale;
@ -952,59 +1035,6 @@
}
#ifdef AH_DEBUG_GLYPH
/* A function used to dump the array of linked segments */
void ah_dump_segments( AH_Outline* outline )
{
AH_Segment* segments;
AH_Segment* segment_limit;
AH_Point* points;
FT_Int dimension;
points = outline->points;
segments = outline->horz_segments;
segment_limit = segments + outline->num_hsegments;
for ( dimension = 1; dimension >= 0; dimension-- )
{
AH_Segment* seg;
printf ( "Table of %s segments:\n",
!dimension ? "vertical" : "horizontal" );
printf ( " [ index | pos | dir | link | serif |"
" numl | first | start ]\n" );
for ( seg = segments; seg < segment_limit; seg++ )
{
printf ( " [ %5d | %4d | %5s | %4d | %5d | %4d | %5d | %5d ]\n",
seg - segments,
(int)seg->pos,
seg->dir == ah_dir_up
? "up"
: ( seg->dir == ah_dir_down
? "down"
: ( seg->dir == ah_dir_left
? "left"
: ( seg->dir == ah_dir_right
? "right"
: "none" ) ) ),
seg->link ? (seg->link-segments) : -1,
seg->serif ? (seg->serif-segments) : -1,
(int)seg->num_linked,
seg->first - points,
seg->last - points );
}
segments = outline->vert_segments;
segment_limit = segments + outline->num_vsegments;
}
}
#endif /* AH_DEBUG_GLYPH */
static
void ah_outline_compute_edges( AH_Outline* outline )
@ -1218,7 +1248,7 @@
/* set the round/straight flags */
edge->flags = ah_edge_normal;
if ( is_straight == 0 && is_round )
if ( is_round > 0 && is_round >= is_straight )
edge->flags |= ah_edge_round;
/* set the edge's main direction */
@ -1286,6 +1316,38 @@
AH_Globals* globals = &face_globals->design;
FT_Fixed y_scale = outline->y_scale;
FT_Bool blue_active[ ah_blue_max ];
/* compute which blue zones are active, i.e. have their scaled */
/* size < 3/4 pixels */
{
AH_Blue blue;
FT_Bool check = 0;
for ( blue = ah_blue_capital_top; blue < ah_blue_max; blue++ )
{
FT_Pos ref, shoot, dist;
ref = globals->blue_refs[blue];
shoot = globals->blue_shoots[blue];
dist = ref-shoot;
if (dist < 0)
dist = -dist;
blue_active[blue] = 0;
if ( FT_MulFix( dist, y_scale ) < 48 )
{
blue_active[blue] = 1;
check = 1;
}
}
/* return immediately if no blue zone is active */
if (!check)
return;
}
/* compute for each horizontal edge, which blue zone is closer */
for ( ; edge < edge_limit; edge++ )
@ -1309,6 +1371,8 @@
FT_Bool is_top_blue = AH_IS_TOP_BLUE( blue );
FT_Bool is_major_dir = edge->dir == outline->horz_major_dir;
if ( !blue_active[blue] )
continue;
/* if it is a top zone, the edge must be against the major */
/* direction; if it is a bottom zone, it must be in the major */
@ -1392,58 +1456,6 @@
}
#ifdef AH_DEBUG_GLYPH
void ah_dump_edges( AH_Outline* outline )
{
AH_Edge* edges;
AH_Edge* edge_limit;
AH_Segment* segments;
FT_Int dimension;
edges = outline->horz_edges;
edge_limit = edges + outline->num_hedges;
segments = outline->horz_segments;
for ( dimension = 1; dimension >= 0; dimension-- )
{
AH_Edge* edge;
printf ( "Table of %s edges:\n",
!dimension ? "vertical" : "horizontal" );
printf ( " [ index | pos | dir | link |"
" serif | blue | opos | pos ]\n" );
for ( edge = edges; edge < edge_limit; edge++ )
{
printf ( " [ %5d | %4d | %5s | %4d | %5d | %c | %5.2f | %5.2f ]\n",
edge - edges,
(int)edge->fpos,
edge->dir == ah_dir_up
? "up"
: ( edge->dir == ah_dir_down
? "down"
: ( edge->dir == ah_dir_left
? "left"
: ( edge->dir == ah_dir_right
? "right"
: "none" ) ) ),
edge->link ? ( edge->link - edges ) : -1,
edge->serif ? ( edge->serif - edges ) : -1,
edge->blue_edge ? 'y' : 'n',
edge->opos / 64.0,
edge->pos / 64.0 );
}
edges = outline->vert_edges;
edge_limit = edges + outline->num_vedges;
segments = outline->vert_segments;
}
}
#endif /* AH_DEBUG_GLYPH */
/* END */

10
src/autohint/ahhint.c
View File

@ -1051,13 +1051,13 @@
switch ( slot->format )
{
case ft_glyph_format_outline:
/* translate glyph outline if we need to */
if ( hinter->transformed )
{
FT_UInt n = slot->outline.n_points;
FT_Vector* point = slot->outline.points;
for ( ; n > 0; point++, n-- )
{
@ -1065,7 +1065,7 @@
point->y += hinter->trans_delta.y;
}
}
/* copy the outline points in the loader's current */
/* extra points, which is used to keep original glyph coordinates */
error = ah_loader_check_points( gloader, slot->outline.n_points + 2,
@ -1365,7 +1365,11 @@
ah_loader_rewind( hinter->loader );
#if 1
load_flags = FT_LOAD_NO_SCALE;
#else
load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_RECURSE;
#endif
error = ah_hinter_load( hinter, glyph_index, load_flags, 0 );

17
src/base/ftcalc.c
View File

@ -55,7 +55,8 @@
FT_EXPORT_DEF( FT_Fixed ) FT_RoundFix( FT_Fixed a )
{
return( ( a + 0x8000L ) & -0x10000L );
return ( a >= 0 ) ? ( a + 0x8000L ) & -0x10000L
: -((-a + 0x8000L ) & -0x10000L );
}
@ -63,7 +64,8 @@
FT_EXPORT_DEF( FT_Fixed ) FT_CeilFix( FT_Fixed a )
{
return( ( a + 0x10000L - 1 ) & -0x10000L );
return ( a >= 0 ) ? ( a + 0xFFFFL ) & -0x10000L
: -((-a + 0xFFFFL ) & -0x10000L );
}
@ -71,7 +73,8 @@
FT_EXPORT_DEF( FT_Fixed ) FT_FloorFix( FT_Fixed a )
{
return( a & -0x10000L );
return ( a >= 0 ) ? a & -0x10000L
: -((-a) & -0x10000L );
}
@ -176,16 +179,16 @@
FT_Int32 s;
FT_UInt32 q;
s = a; a = ABS(a);
s ^= b; b = ABS(b);
s = 1;
if ( a < 0 ) { a = -a; s = -1; }
if ( b < 0 ) { b = -b; s = -s; }
if ( b == 0 )
/* check for division by 0 */
q = 0x7FFFFFFFL;
else
/* compute result directly */
q = ( ((FT_Int64)a + (b >> 1)) << 16 ) / b;
q = ( ((FT_Int64)a << 16) + (b >> 1)) / b;
return (FT_Long)( s < 0 ? -q : q );
}