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* src/pshinter/pshalgo.c: major speed improvements to the Postscript

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hinter, more than 100% speed increase on my machine
This commit is contained in:
David Turner 2006-10-23 08:56:57 +00:00
parent b9e6d69a96
commit e140f14232
2 changed files with 317 additions and 185 deletions
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9
ChangeLog
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@ -1,3 +1,8 @@
2006-10-23 David Turner <david@freetype.org>
* src/pshinter/pshalgo.c: major speed improvements to the Postscript
hinter, more than 100% speed increase on my machine
2006-10-15 suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
* src/base/ftmac.c (FT_New_Face_From_FOND): Initialize variable
@ -65,7 +70,7 @@
auto-hinting shall be used or not.
* src/truetype/ttobjs.c (tt_face_init): Ditto.
2006-09-30 Werner Lemberg <wl@gnu.org>
* src/base/rules.mk (BASE_SRC): Remove `ftapi.c' (which is no longer
@ -95,7 +100,7 @@
* include/freetype/freetype.h (FT_FREETYPE_PATCH): Set to 2.
Add a new API to support color filtering of subpixel glyph bitmaps.
Add a new API to support color filtering of subpixel glyph bitmaps.
In a default build, the function `FT_Library_SetLcdFilter' returns
`FT_Err_Unimplemented_Feature'; you need to #define
FT_CONFIG_OPTION_SUBPIXEL_RENDERING in ftoption.h to compile the

493
src/pshinter/pshalgo.c
View File

@ -879,8 +879,96 @@
/*************************************************************************/
/*************************************************************************/
FT_LOCAL_DEF( FT_Int )
psh_corner_is_flat( FT_Pos x_in,
FT_Pos y_in,
FT_Pos x_out,
FT_Pos y_out )
{
FT_Pos ax = x_in;
FT_Pos ay = y_in;
FT_Pos d_in, d_out, d_corner;
if ( ax < 0 )
ax = -ax;
if ( ay < 0 )
ay = -ay;
d_in = ax + ay;
ax = x_out;
if ( ax < 0 )
ax = -ax;
ay = y_out;
if ( ay < 0 )
ay = -ay;
d_out = ax + ay;
ax = x_out + x_in;
if ( ax < 0 )
ax = -ax;
ay = y_out + y_in;
if ( ay < 0 )
ay = -ay;
d_corner = ax + ay;
return ( d_in + d_out - d_corner ) < ( d_corner >> 4 );
}
#ifdef COMPUTE_INFLEXS
static FT_Int
psh_corner_orientation( FT_Pos in_x,
FT_Pos in_y,
FT_Pos out_x,
FT_Pos out_y )
{
FT_Int result;
/* deal with the trivial cases quickly */
if ( in_y == 0 )
{
if ( in_x >= 0 )
result = out_y;
else
result = -out_y;
}
else if ( in_x == 0 )
{
if ( in_y >= 0 )
result = -out_x;
else
result = out_x;
}
else if ( out_y == 0 )
{
if ( out_x >= 0 )
result = in_y;
else
result = -in_y;
}
else if ( out_x == 0 )
{
if ( out_y >= 0 )
result = -in_x;
else
result = in_x;
}
else /* general case */
{
long long delta = (long long)in_x*out_y - (long long)in_y*out_x;
if ( delta == 0 )
result = 0;
else
result = 1 - 2*(delta < 0);
}
return result;
}
/* compute all inflex points in a given glyph */
static void
psh_glyph_compute_inflections( PSH_Glyph glyph )
@ -891,8 +979,8 @@
for ( n = 0; n < glyph->num_contours; n++ )
{
PSH_Point first, start, end, before, after;
FT_Angle angle_in, angle_seg, angle_out;
FT_Angle diff_in, diff_out;
FT_Pos in_x, in_y, out_x, out_y;
FT_Int orient_prev, orient_cur;
FT_Int finished = 0;
@ -910,9 +998,10 @@
if ( end == first )
goto Skip;
} while ( PSH_POINT_EQUAL_ORG( end, first ) );
in_x = end->org_u - start->org_u;
in_y = end->org_v - start->org_v;
angle_seg = PSH_POINT_ANGLE( start, end );
} while ( in_x == 0 && out_x == 0 );
/* extend the segment start whenever possible */
before = start;
@ -925,14 +1014,18 @@
if ( before == first )
goto Skip;
} while ( PSH_POINT_EQUAL_ORG( before, start ) );
out_x = start->org_u - before->org_u;
out_y = start->org_v - before->org_v;
angle_in = PSH_POINT_ANGLE( before, start );
} while ( out_x == 0 && out_y == 0 );
} while ( angle_in == angle_seg );
orient_prev = psh_corner_orientation( in_x, in_y, out_x, out_y );
} while ( orient_prev != 0 );
first = start;
diff_in = FT_Angle_Diff( angle_in, angle_seg );
in_x = out_x;
in_y = out_y;
/* now, process all segments in the contour */
do
@ -948,19 +1041,17 @@
if ( after == first )
finished = 1;
} while ( PSH_POINT_EQUAL_ORG( end, after ) );
out_x = after->org_u - end->org_u;
out_y = after->org_v - end->org_v;
angle_out = PSH_POINT_ANGLE( end, after );
} while ( out_x == 0 && out_y == 0 );
} while ( angle_out == angle_seg );
orient_cur = psh_corner_orientation( in_x, in_y, out_x, out_y );
diff_out = FT_Angle_Diff( angle_seg, angle_out );
} while ( orient_cur == 0 );
if ( ( diff_in ^ diff_out ) < 0 )
if ( (orient_cur ^ orient_prev) < 0 )
{
/* diff_in and diff_out have different signs, we have */
/* inflection points here... */
do
{
psh_point_set_inflex( start );
@ -971,10 +1062,11 @@
psh_point_set_inflex( start );
}
start = end;
end = after;
angle_seg = angle_out;
diff_in = diff_out;
start = end;
end = after;
orient_prev = orient_cur;
in_x = out_x;
in_y = out_y;
} while ( !finished );
@ -1199,29 +1291,14 @@
/* detect smooth points */
if ( point->flags & PSH_POINT_OFF )
point->flags |= PSH_POINT_SMOOTH;
else if ( point->dir_in != PSH_DIR_NONE ||
point->dir_out != PSH_DIR_NONE )
else if ( point->dir_in == point->dir_out )
{
if ( point->dir_in == point->dir_out )
point->flags |= PSH_POINT_SMOOTH;
}
else
{
FT_Angle angle_in, angle_out, diff;
angle_in = FT_Atan2( dxi, dyi );
angle_out = FT_Atan2( dxo, dyo );
diff = angle_in - angle_out;
if ( diff < 0 )
diff = -diff;
if ( diff > FT_ANGLE_PI )
diff = FT_ANGLE_2PI - diff;
if ( diff < FT_ANGLE_PI / 16 )
if ( point->dir_out != PSH_DIR_NONE ||
psh_corner_is_flat( dxi, dyi, dxo, dyo ) )
{
point->flags |= PSH_POINT_SMOOTH;
}
}
}
}
@ -1382,115 +1459,138 @@
/* -major_dir. */
static void
psh_hint_table_find_strong_point( PSH_Hint_Table table,
PSH_Point point,
FT_Int threshold,
FT_Int major_dir )
psh_hint_table_find_strong_points( PSH_Hint_Table table,
PSH_Point point,
FT_UInt count,
FT_Int threshold,
FT_Int major_dir )
{
PSH_Hint* sort = table->sort;
FT_UInt num_hints = table->num_hints;
FT_Int point_dir = 0;
if ( PSH_DIR_COMPARE( point->dir_in, major_dir ) )
point_dir = point->dir_in;
else if ( PSH_DIR_COMPARE( point->dir_out, major_dir ) )
point_dir = point->dir_out;
if ( point_dir )
for ( ; count > 0; count--, point++ )
{
FT_UInt flag;
FT_Int point_dir = 0;
FT_Pos org_u = point->org_u;
if ( psh_point_is_strong( point ) )
continue;
for ( ; num_hints > 0; num_hints--, sort++ )
if ( PSH_DIR_COMPARE( point->dir_in, major_dir ) )
point_dir = point->dir_in;
else if ( PSH_DIR_COMPARE( point->dir_out, major_dir ) )
point_dir = point->dir_out;
if ( point_dir )
{
PSH_Hint hint = sort[0];
FT_Pos d;
if ( point_dir == major_dir )
{
flag = PSH_POINT_EDGE_MIN;
d = point->org_u - hint->org_pos;
FT_UInt nn;
if ( FT_ABS( d ) < threshold )
for ( nn = 0; nn < num_hints; nn++ )
{
Is_Strong:
psh_point_set_strong( point );
point->flags2 |= flag;
point->hint = hint;
break;
PSH_Hint hint = sort[nn];
FT_Pos d = org_u - hint->org_pos;
if ( d < threshold && -d < threshold )
{
psh_point_set_strong( point );
point->flags2 |= PSH_POINT_EDGE_MIN;
point->hint = hint;
break;
}
}
}
else if ( point_dir == -major_dir )
{
flag = PSH_POINT_EDGE_MAX;
d = point->org_u - hint->org_pos - hint->org_len;
FT_UInt nn;
if ( FT_ABS( d ) < threshold )
goto Is_Strong;
for ( nn = 0; nn < num_hints; nn++ )
{
PSH_Hint hint = sort[nn];
FT_Pos d = org_u - hint->org_pos - hint->org_len;
if ( d < threshold && -d < threshold )
{
psh_point_set_strong( point );
point->flags2 |= PSH_POINT_EDGE_MAX;
point->hint = hint;
break;
}
}
}
}
}
#if 1
else if ( psh_point_is_extremum( point ) )
{
/* treat extrema as special cases for stem edge alignment */
FT_UInt min_flag, max_flag;
if ( major_dir == PSH_DIR_HORIZONTAL )
else if ( psh_point_is_extremum( point ) )
{
min_flag = PSH_POINT_POSITIVE;
max_flag = PSH_POINT_NEGATIVE;
}
else
{
min_flag = PSH_POINT_NEGATIVE;
max_flag = PSH_POINT_POSITIVE;
}
/* treat extrema as special cases for stem edge alignment */
FT_UInt nn, min_flag, max_flag;
for ( ; num_hints > 0; num_hints--, sort++ )
{
PSH_Hint hint = sort[0];
FT_Pos d;
FT_Int flag;
if ( major_dir == PSH_DIR_HORIZONTAL )
{
min_flag = PSH_POINT_POSITIVE;
max_flag = PSH_POINT_NEGATIVE;
}
else
{
min_flag = PSH_POINT_NEGATIVE;
max_flag = PSH_POINT_POSITIVE;
}
if ( point->flags2 & min_flag )
{
flag = PSH_POINT_EDGE_MIN;
d = point->org_u - hint->org_pos;
if ( FT_ABS( d ) < threshold )
for ( nn = 0; nn < num_hints; nn++ )
{
Is_Strong2:
point->flags2 |= flag;
point->hint = hint;
psh_point_set_strong( point );
break;
PSH_Hint hint = sort[nn];
FT_Pos d = org_u - hint->org_pos;
if ( d < threshold && -d < threshold )
{
point->flags2 |= PSH_POINT_EDGE_MIN;
point->hint = hint;
psh_point_set_strong( point );
break;
}
}
}
else if ( point->flags2 & max_flag )
{
flag = PSH_POINT_EDGE_MAX;
d = point->org_u - hint->org_pos - hint->org_len;
for ( nn = 0; nn < num_hints; nn++ )
{
PSH_Hint hint = sort[nn];
FT_Pos d = org_u - hint->org_pos - hint->org_len;
if ( FT_ABS( d ) < threshold )
goto Is_Strong2;
if ( d < threshold && -d < threshold )
{
point->flags2 |= PSH_POINT_EDGE_MAX;
point->hint = hint;
psh_point_set_strong( point );
break;
}
}
}
if ( point->org_u >= hint->org_pos &&
point->org_u <= hint->org_pos + hint->org_len )
if ( point->hint == NULL )
{
point->hint = hint;
for ( nn = 0; nn < num_hints; nn++ )
{
PSH_Hint hint = sort[nn];
if ( org_u >= hint->org_pos &&
org_u <= hint->org_pos + hint->org_len )
{
point->hint = hint;
break;
}
}
}
}
}
#endif /* 1 */
}
}
@ -1544,9 +1644,8 @@
psh_hint_table_activate_mask( table, mask );
for ( ; count > 0; count--, point++ )
psh_hint_table_find_strong_point( table, point,
threshold, major_dir );
psh_hint_table_find_strong_points( table, point, count,
threshold, major_dir );
}
first = next;
}
@ -1560,12 +1659,9 @@
psh_hint_table_activate_mask( table, table->hint_masks->masks );
for ( ; count > 0; count--, point++ )
{
if ( !psh_point_is_strong( point ) )
psh_hint_table_find_strong_point( table, point,
threshold, major_dir );
}
psh_hint_table_find_strong_points( table, point, count,
threshold, major_dir );
}
/* now, certain points may have been attached to a hint and */
@ -1710,6 +1806,8 @@
}
#define PSH_MAX_STRONG_INTERNAL 16
static void
psh_glyph_interpolate_normal_points( PSH_Glyph glyph,
FT_Int dimension )
@ -1718,14 +1816,60 @@
#if 1
/* first technique: a point is strong if it is a local extremum */
PSH_Dimension dim = &glyph->globals->dimension[dimension];
FT_Fixed scale = dim->scale_mult;
PSH_Dimension dim = &glyph->globals->dimension[dimension];
FT_Fixed scale = dim->scale_mult;
FT_Memory memory = glyph->memory;
FT_UInt count = glyph->num_points;
PSH_Point point = glyph->points;
PSH_Point* strongs = NULL;
PSH_Point strongs_0[ PSH_MAX_STRONG_INTERNAL ];
FT_UInt num_strongs = 0;
PSH_Point points = glyph->points;
PSH_Point points_end = points + glyph->num_points;
PSH_Point point;
for ( ; count > 0; count--, point++ )
/* first count the number of strong points */
for ( point = points; point < points_end; point++ )
{
if ( psh_point_is_strong( point ) )
num_strongs++;
}
if ( num_strongs == 0 ) /* nothing to do here */
return;
/* allocate an array to store a list of points, stored in increasing org_u order */
if ( num_strongs <= PSH_MAX_STRONG_INTERNAL )
strongs = strongs_0;
else
{
FT_Error error;
if ( !FT_NEW_ARRAY( strongs, num_strongs ) )
return;
}
num_strongs = 0;
for ( point = points; point < points_end; point++ )
{
PSH_Point* insert;
if ( !psh_point_is_strong( point ) )
continue;
for ( insert = strongs + num_strongs; insert > strongs; insert-- )
{
if ( insert[-1]->org_u <= point->org_u )
break;
insert[0] = insert[-1];
}
insert[0] = point;
num_strongs++;
}
/* now try to interpolate all normal points */
for ( point = points; point < points_end; point++ )
{
if ( psh_point_is_strong( point ) )
continue;
@ -1744,82 +1888,65 @@
point->flags &= ~PSH_POINT_SMOOTH;
}
/* find best enclosing point coordinates */
/* find best enclosing point coordinates then interpolate */
{
PSH_Point before = 0;
PSH_Point after = 0;
PSH_Point before, after;
FT_UInt nn;
FT_Pos diff_before = -32000;
FT_Pos diff_after = 32000;
FT_Pos u = point->org_u;
for ( nn = 0; nn < num_strongs; nn++ )
if ( strongs[nn]->org_u > point->org_u )
break;
FT_Int count2 = glyph->num_points;
PSH_Point cur = glyph->points;
for ( ; count2 > 0; count2--, cur++ )
if ( nn == 0 ) /* point before the first strong point */
{
if ( psh_point_is_strong( cur ) )
{
FT_Pos diff = cur->org_u - u;
after = strongs[0];
if ( diff <= 0 )
{
if ( diff > diff_before )
{
diff_before = diff;
before = cur;
}
}
else if ( diff >= 0 )
{
if ( diff < diff_after )
{
diff_after = diff;
after = cur;
}
}
}
}
if ( !before )
{
if ( !after )
continue;
/* we are before the first strong point coordinate; */
/* simply translate the point */
point->cur_u = after->cur_u +
FT_MulFix( point->org_u - after->org_u, scale );
}
else if ( !after )
{
/* we are after the last strong point coordinate; */
/* simply translate the point */
point->cur_u = before->cur_u +
FT_MulFix( point->org_u - before->org_u, scale );
FT_MulFix( point->org_u - after->org_u, scale );
}
else
{
if ( diff_before == 0 )
point->cur_u = before->cur_u;
before = strongs[nn-1];
else if ( diff_after == 0 )
point->cur_u = after->cur_u;
for ( nn = num_strongs; nn > 0; nn-- )
if ( strongs[nn-1]->org_u < point->org_u )
break;
if ( nn == num_strongs ) /* point is after last strong point */
{
before = strongs[nn-1];
else
point->cur_u = before->cur_u +
FT_MulDiv( u - before->org_u,
after->cur_u - before->cur_u,
after->org_u - before->org_u );
}
FT_MulFix( point->org_u - before->org_u, scale );
}
else
{
FT_Pos u;
after = strongs[nn];
/* now interpolate point between before and after */
u = point->org_u;
if ( u == before->org_u )
point->cur_u = before->cur_u;
else if ( u == after->org_u )
point->cur_u = after->cur_u;
else
point->cur_u = before->cur_u +
FT_MulDiv( u - before->org_u,
after->cur_u - before->cur_u,
after->org_u - before->org_u );
}
}
psh_point_set_fitted( point );
}
}
if ( strongs != strongs_0 )
FT_FREE( strongs );
#endif /* 1 */
}