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[autofit] Add bluezones for CJK Ideographs. 

To remove extremas of vertical strokes of CJK Ideographs at
low resolution and make the top and bottom horizontal stems
aligned, bluezones for CJK Ideographs are calculated from
sample glyphs.  At present, vertical bluezones (bluezones
to align vertical stems) are disabled by default.  For detail, see
http://lists.gnu.org/archive/html/freetype-devel/2011-04/msg00070.html
http://lists.gnu.org/archive/html/freetype-devel/2011-04/msg00092.html
http://lists.gnu.org/archive/html/freetype-devel/2011-05/msg00001.html

* include/freetype/internal/fttrace.h: New trace component `afcjk'.
* src/autofit/afcjk.h (AF_CJK{Blue,Axis,Metric}Rec): Add CJK version
for AF_Latin{Blue,Axis,Metric}Rec.
(af_cjk_metrics_check_digits): Ditto, shared with Indic module.
(af_cjk_metrics_init_widths): Ditto.
(af_cjk_metrics_init): Take AF_CJKMetric instead of AF_LatinMetric.
(af_cjk_metrics_scale): Ditto (declaration).
(af_cjk_hints_init): Ditto (declaration).
(af_cjk_hints_apply): Ditto (declaration).
* src/autofit/afcjk.c (af_cjk_metrics_scale): Ditto (body).
(af_cjk_hints_init): Ditto (body).
(af_cjk_hints_apply): Ditto (body).
(af_cjk_metrics_init_widths): Duplicate af_latin_metrics_init_widths.
(af_cjk_metrics_check_digits): Duplicate af_latin_metrics_check_digits.
(af_cjk_metrics_init): Call CJK bluezone initializer.
(af_cjk_metrics_scale_dim): Add code to scale bluezones.
(af_cjk_hints_compute_blue_edges): New function, CJK version of
af_latin_hints_compute_blue_edges.
(af_cjk_metrics_init_blues): New function, CJK version of
af_latin_metrics_init_blues.
(af_cjk_hints_edges): Add code to align the edge stems to blue zones.

* src/autofit/afindic.c (af_indic_metrics_init): Take AF_CJKMetric
instead of AF_LatinMetric, and initialize as af_cjk_metrics_init.
However bluezones are not initialized.
(af_indic_metrics_scale): Take AF_CJKMetric instead of AF_LatinMetric.
(af_indic_hints_init): Ditto.
(af_indic_hints_apply): Ditto.

* docs/CHANGES: Note about CJK bluezone support.
This commit is contained in:
suzuki toshiya 2011-05-08 19:07:13 +09:00
parent d2e82aa07e
commit 084abf0469
6 changed files with 878 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
ChangeLog
View File

@ -1,3 +1,48 @@
2011-05-08 Just Fill Bugs <mozbugbox@yahoo.com.au>
suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
[autofit] Add bluezones for CJK Ideographs.
To remove extremas of vertical strokes of CJK Ideographs at
low resolution and make the top and bottom horizontal stems
aligned, bluezones for CJK Ideographs are calculated from
sample glyphs. At present, vertical bluezones (bluezones
to align vertical stems) are disabled by default. For detail, see
http://lists.gnu.org/archive/html/freetype-devel/2011-04/msg00070.html
http://lists.gnu.org/archive/html/freetype-devel/2011-04/msg00092.html
http://lists.gnu.org/archive/html/freetype-devel/2011-05/msg00001.html
* include/freetype/internal/fttrace.h: New trace component `afcjk'.
* src/autofit/afcjk.h (AF_CJK{Blue,Axis,Metric}Rec): Add CJK version
for AF_Latin{Blue,Axis,Metric}Rec.
(af_cjk_metrics_check_digits): Ditto, shared with Indic module.
(af_cjk_metrics_init_widths): Ditto.
(af_cjk_metrics_init): Take AF_CJKMetric instead of AF_LatinMetric.
(af_cjk_metrics_scale): Ditto (declaration).
(af_cjk_hints_init): Ditto (declaration).
(af_cjk_hints_apply): Ditto (declaration).
* src/autofit/afcjk.c (af_cjk_metrics_scale): Ditto (body).
(af_cjk_hints_init): Ditto (body).
(af_cjk_hints_apply): Ditto (body).
(af_cjk_metrics_init_widths): Duplicate af_latin_metrics_init_widths.
(af_cjk_metrics_check_digits): Duplicate af_latin_metrics_check_digits.
(af_cjk_metrics_init): Call CJK bluezone initializer.
(af_cjk_metrics_scale_dim): Add code to scale bluezones.
(af_cjk_hints_compute_blue_edges): New function, CJK version of
af_latin_hints_compute_blue_edges.
(af_cjk_metrics_init_blues): New function, CJK version of
af_latin_metrics_init_blues.
(af_cjk_hints_edges): Add code to align the edge stems to blue zones.
* src/autofit/afindic.c (af_indic_metrics_init): Take AF_CJKMetric
instead of AF_LatinMetric, and initialize as af_cjk_metrics_init.
However bluezones are not initialized.
(af_indic_metrics_scale): Take AF_CJKMetric instead of AF_LatinMetric.
(af_indic_hints_init): Ditto.
(af_indic_hints_apply): Ditto.
* docs/CHANGES: Note about CJK bluezone support.
2011-05-06 Werner Lemberg <wl@gnu.org>
[autofit] Remove unused struct member.

5
docs/CHANGES
View File

@ -16,6 +16,11 @@ CHANGES BETWEEN 2.4.4 and 2.4.5
redundant and is simply ignored; this means that FreeType now
ignores the global advance width value in TrueType fonts.
- Just Fill Bugs contributed an experimental code to compute blue
zones for CJK Ideographs, to improve the alignment of horizontal
stems at the top or bottom edges. Mainly tested with a TrueType
WenQuanYi-ZenHei.
III. MISCELLANEOUS

1
include/freetype/internal/fttrace.h
View File

@ -136,6 +136,7 @@ FT_TRACE_DEF( gxvprop )
FT_TRACE_DEF( gxvlcar )
/* autofit components */
FT_TRACE_DEF( afcjk )
FT_TRACE_DEF( aflatin )
FT_TRACE_DEF( aflatin2 )
FT_TRACE_DEF( afwarp )

740
src/autofit/afcjk.c
View File

@ -22,12 +22,18 @@
*
*/
#include <ft2build.h>
#include FT_ADVANCES_H
#include FT_INTERNAL_DEBUG_H
#include "aftypes.h"
#include "aflatin.h"
#ifdef AF_CONFIG_OPTION_CJK
#undef AF_CONFIG_OPTION_CJK_BLUE_HANI_VERT
#include "afcjk.h"
#include "aferrors.h"
@ -37,6 +43,16 @@
#endif
/*************************************************************************/
/* */
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
/* messages during execution. */
/* */
#undef FT_COMPONENT
#define FT_COMPONENT trace_afcjk
/*************************************************************************/
/*************************************************************************/
/***** *****/
@ -45,24 +61,481 @@
/*************************************************************************/
/*************************************************************************/
/* Basically the Latin version with AF_CJKMetrics to replace AF_LatinMetrics */
FT_LOCAL_DEF( void )
af_cjk_metrics_init_widths( AF_CJKMetrics metrics,
FT_Face face,
FT_ULong charcode )
{
/* scan the array of segments in each direction */
AF_GlyphHintsRec hints[1];
af_glyph_hints_init( hints, face->memory );
metrics->axis[AF_DIMENSION_HORZ].width_count = 0;
metrics->axis[AF_DIMENSION_VERT].width_count = 0;
{
FT_Error error;
FT_UInt glyph_index;
int dim;
AF_CJKMetricsRec dummy[1];
AF_Scaler scaler = &dummy->root.scaler;
glyph_index = FT_Get_Char_Index( face, charcode );
if ( glyph_index == 0 )
goto Exit;
error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
if ( error || face->glyph->outline.n_points <= 0 )
goto Exit;
FT_ZERO( dummy );
dummy->units_per_em = metrics->units_per_em;
scaler->x_scale = 0x10000L;
scaler->y_scale = 0x10000L;
scaler->x_delta = 0;
scaler->y_delta = 0;
scaler->face = face;
scaler->render_mode = FT_RENDER_MODE_NORMAL;
scaler->flags = 0;
af_glyph_hints_rescale( hints, (AF_ScriptMetrics)dummy );
error = af_glyph_hints_reload( hints, &face->glyph->outline );
if ( error )
goto Exit;
for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
{
AF_CJKAxis axis = &metrics->axis[dim];
AF_AxisHints axhints = &hints->axis[dim];
AF_Segment seg, limit, link;
FT_UInt num_widths = 0;
error = af_latin_hints_compute_segments( hints,
(AF_Dimension)dim );
if ( error )
goto Exit;
af_latin_hints_link_segments( hints,
(AF_Dimension)dim );
seg = axhints->segments;
limit = seg + axhints->num_segments;
for ( ; seg < limit; seg++ )
{
link = seg->link;
/* we only consider stem segments there! */
if ( link && link->link == seg && link > seg )
{
FT_Pos dist;
dist = seg->pos - link->pos;
if ( dist < 0 )
dist = -dist;
if ( num_widths < AF_CJK_MAX_WIDTHS )
axis->widths[num_widths++].org = dist;
}
}
af_sort_widths( num_widths, axis->widths );
axis->width_count = num_widths;
}
Exit:
for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
{
AF_CJKAxis axis = &metrics->axis[dim];
FT_Pos stdw;
stdw = ( axis->width_count > 0 )
? axis->widths[0].org
: AF_LATIN_CONSTANT( metrics, 50 );
/* let's try 20% of the smallest width */
axis->edge_distance_threshold = stdw / 5;
axis->standard_width = stdw;
axis->extra_light = 0;
}
}
af_glyph_hints_done( hints );
}
#define AF_CJK_MAX_TEST_CHARACTERS 32
/* Every blue zone has 2 types of fill and unfill,
* Which means fill the entire square or not.
* */
enum
{
AF_CJK_BLUE_TYPE_FILL,
AF_CJK_BLUE_TYPE_UNFILL,
AF_CJK_BLUE_TYPE_MAX
};
/* Put some common and representative Han Ideographs characters here. */
static const FT_ULong af_cjk_hani_blue_chars[AF_CJK_BLUE_MAX]
[AF_CJK_BLUE_TYPE_MAX]
[AF_CJK_MAX_TEST_CHARACTERS] =
{
{
{
0x4ED6, 0x4EEC, 0x4F60, 0x4F86, 0x5011, 0x5230, 0x548C, 0x5730,
0x5BF9, 0x5C0D, 0x5C31, 0x5E2D, 0x6211, 0x65F6, 0x6642, 0x6703,
0x6765, 0x70BA, 0x80FD, 0x8230, 0x8AAA, 0x8BF4, 0x8FD9, 0x9019,
0x9F4A /* top fill */
},
{
0x519B, 0x540C, 0x5DF2, 0x613F, 0x65E2, 0x661F, 0x662F, 0x666F,
0x6C11, 0x7167, 0x73B0, 0x73FE, 0x7406, 0x7528, 0x7F6E, 0x8981,
0x8ECD, 0x90A3, 0x914D, 0x91CC, 0x958B, 0x96F7, 0x9732, 0x9762,
0x987E /* top unfill */
}
},
{
{
0x4E2A, 0x4E3A, 0x4EBA, 0x4ED6, 0x4EE5, 0x4EEC, 0x4F60, 0x4F86,
0x500B, 0x5011, 0x5230, 0x548C, 0x5927, 0x5BF9, 0x5C0D, 0x5C31,
0x6211, 0x65F6, 0x6642, 0x6709, 0x6765, 0x70BA, 0x8981, 0x8AAA,
0x8BF4 /* bottom fill */
},
{
0x4E3B, 0x4E9B, 0x56E0, 0x5B83, 0x60F3, 0x610F, 0x7406, 0x751F,
0x7576, 0x770B, 0x7740, 0x7F6E, 0x8005, 0x81EA, 0x8457, 0x88E1,
0x8FC7, 0x8FD8, 0x8FDB, 0x9032, 0x904E, 0x9053, 0x9084, 0x91CC,
0x9762 /* bottom unfill */
}
},
#ifndef AF_CONFIG_OPTION_CJK_BLUE_HANI_VERT
{ {0x0000}, {0x0000} },
{ {0x0000}, {0x0000} }
#else
{
{
0x4E9B, 0x4EEC, 0x4F60, 0x4F86, 0x5011, 0x5230, 0x548C, 0x5730,
0x5979, 0x5C06, 0x5C07, 0x5C31, 0x5E74, 0x5F97, 0x60C5, 0x6700,
0x6837, 0x6A23, 0x7406, 0x80FD, 0x8AAA, 0x8BF4, 0x8FD9, 0x9019,
0x901A /* left fill */
},
{
0x5373, 0x5417, 0x5427, 0x542C, 0x5462, 0x54C1, 0x54CD, 0x55CE,
0x5E08, 0x5E2B, 0x6536, 0x65AD, 0x65B7, 0x660E, 0x773C, 0x9593,
0x95F4, 0x9645, 0x9648, 0x9650, 0x9664, 0x9673, 0x968F, 0x969B,
0x96A8 /* left unfill */
}
},
{
{
0x4E8B, 0x524D, 0x5B78, 0x5C06, 0x5C07, 0x60C5, 0x60F3, 0x6216,
0x653F, 0x65AF, 0x65B0, 0x6837, 0x6A23, 0x6C11, 0x6C92, 0x6CA1,
0x7136, 0x7279, 0x73B0, 0x73FE, 0x7403, 0x7B2C, 0x7D93, 0x8C01,
0x8D77 /* right fill */
},
{
0x4F8B, 0x5225, 0x522B, 0x5236, 0x52A8, 0x52D5, 0x5417, 0x55CE,
0x589E, 0x6307, 0x660E, 0x671D, 0x671F, 0x6784, 0x7269, 0x786E,
0x79CD, 0x8ABF, 0x8C03, 0x8CBB, 0x8D39, 0x90A3, 0x90FD, 0x9593,
0x95F4 /* right unfill */
}
}
#endif /* AF_CONFIG_OPTION_CJK_BLUE_HANI_VERT */
};
/* Calculate blue zones for all the CJK_BLUE_XXX's */
static void
af_cjk_metrics_init_blues( AF_CJKMetrics metrics,
FT_Face face,
const FT_ULong blue_chars[AF_CJK_BLUE_MAX]
[AF_CJK_BLUE_TYPE_MAX]
[AF_CJK_MAX_TEST_CHARACTERS] )
{
FT_Pos fills[AF_CJK_MAX_TEST_CHARACTERS];
FT_Pos flats[AF_CJK_MAX_TEST_CHARACTERS];
FT_Int num_fills;
FT_Int num_flats;
FT_Int bb;
AF_CJKBlue blue;
FT_Error error;
AF_CJKAxis axis;
FT_GlyphSlot glyph = face->glyph;
/* we compute the blues simply by loading each character from the */
/* 'blue_chars[blues]' string, then compute its extreme */
/* points (depending blue zone type etc.) */
FT_TRACE5(( "cjk blue zones computation\n" ));
FT_TRACE5(( "------------------------------------------------\n" ));
for ( bb = 0; bb < AF_CJK_BLUE_MAX; bb++ )
{
FT_Int fill_type;
FT_Pos* blue_ref;
FT_Pos* blue_shoot;
num_fills = 0;
num_flats = 0;
for ( fill_type = 0 ; fill_type < AF_CJK_BLUE_TYPE_MAX; fill_type++)
{
const FT_ULong* p = blue_chars[bb][fill_type];
const FT_ULong* limit = p + AF_CJK_MAX_TEST_CHARACTERS;
FT_Bool fill = FT_BOOL( fill_type == AF_CJK_BLUE_TYPE_FILL );
FT_TRACE5(( "cjk blue %3d/%d: ", bb, fill_type ));
for ( ; p < limit && *p; p++ )
{
FT_UInt glyph_index;
FT_Pos best_pos; /* same as points.y */
FT_Int best_point, best_first, best_last;
FT_Vector* points;
FT_TRACE5(( "0x%lX", *p ));
/* load the character in the face -- skip unknown or empty ones */
glyph_index = FT_Get_Char_Index( face, *p );
if ( glyph_index == 0 )
continue;
error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
if ( error || glyph->outline.n_points <= 0 )
continue;
/* now compute min or max point indices and coordinates */
points = glyph->outline.points;
best_point = -1;
best_pos = 0; /* make compiler happy */
best_first = 0; /* ditto */
best_last = 0; /* ditto */
{
FT_Int nn;
FT_Int first = 0;
FT_Int last = -1;
for ( nn = 0; nn < glyph->outline.n_contours; first = last+1, nn++ )
{
FT_Int old_best_point = best_point;
FT_Int pp;
last = glyph->outline.contours[nn];
/* Avoid single-point contours since they are never rasterized. */
/* In some fonts, they correspond to mark attachment points */
/* which are way outside of the glyph's real outline. */
if ( last <= first )
continue;
switch (bb)
{
case AF_CJK_BLUE_TOP:
for ( pp = first; pp <= last; pp++ )
if ( best_point < 0 || points[pp].y > best_pos )
{
best_point = pp;
best_pos = points[pp].y;
}
break;
case AF_CJK_BLUE_BOTTOM:
for ( pp = first; pp <= last; pp++ )
if ( best_point < 0 || points[pp].y < best_pos )
{
best_point = pp;
best_pos = points[pp].y;
}
break;
case AF_CJK_BLUE_LEFT:
for ( pp = first; pp <= last; pp++ )
if ( best_point < 0 || points[pp].x < best_pos )
{
best_point = pp;
best_pos = points[pp].x;
}
break;
case AF_CJK_BLUE_RIGHT:
for ( pp = first; pp <= last; pp++ )
if ( best_point < 0 || points[pp].x > best_pos )
{
best_point = pp;
best_pos = points[pp].x;
}
break;
default:
;
}
if ( best_point != old_best_point )
{
best_first = first;
best_last = last;
}
}
FT_TRACE5(( "%5ld, ", best_pos ));
}
if (fill)
fills[num_fills++] = best_pos;
else
flats[num_flats++] = best_pos;
}
FT_TRACE5(( "\n" ));
}
if ( num_flats == 0 && num_fills == 0)
{
/*
* we couldn't find a single glyph to compute this blue zone,
* we will simply ignore it then
*/
FT_TRACE5(( "empty\n" ));
continue;
}
/* we have computed the contents of the `fill' and `flats' tables, */
/* now determine the reference position of the blue -- */
/* we simply take the median value after a simple sort */
af_sort_pos( num_flats, flats );
af_sort_pos( num_fills, fills );
if ( AF_CJK_BLUE_TOP == bb || AF_CJK_BLUE_BOTTOM == bb )
axis = &metrics->axis[AF_DIMENSION_VERT];
else
axis = &metrics->axis[AF_DIMENSION_HORZ];
blue = & axis->blues[axis->blue_count];
blue_ref = & blue->ref.org;
blue_shoot = & blue->shoot.org;
axis->blue_count++;
if ( num_flats == 0 )
{
*blue_ref = fills[num_fills / 2];
*blue_shoot = fills[num_fills / 2];
}
else if ( num_fills == 0 )
{
*blue_ref = flats[num_flats / 2];
*blue_shoot = flats[num_flats / 2];
}
else
{
*blue_ref = fills[num_fills / 2];
*blue_shoot = flats[num_flats / 2];
}
/* make sure blue_ref >= blue_shoot for top/right or
* vis vesa for bottom/left. */
if ( *blue_shoot != *blue_ref )
{
FT_Pos ref = *blue_ref;
FT_Pos shoot = *blue_shoot;
FT_Bool under_ref = FT_BOOL( shoot < ref );
if ( (AF_CJK_BLUE_TOP == bb || AF_CJK_BLUE_RIGHT == bb) ^ under_ref )
*blue_shoot = *blue_ref = ( shoot + ref ) / 2;
}
blue->flags = 0;
if ( AF_CJK_BLUE_TOP == bb )
blue->flags |= AF_CJK_BLUE_IS_TOP;
else if ( AF_CJK_BLUE_RIGHT == bb )
blue->flags |= AF_CJK_BLUE_IS_RIGHT;
FT_TRACE5(( "-- cjk ref = %ld shoot = %ld\n", *blue_ref, *blue_shoot ));
}
return;
}
/* Basically the Latin version with type AF_CJKMetrics for metrics. */
FT_LOCAL_DEF( void )
af_cjk_metrics_check_digits( AF_CJKMetrics metrics,
FT_Face face )
{
FT_UInt i;
FT_Bool started = 0, same_width = 1;
FT_Fixed advance, old_advance = 0;
/* check whether all ASCII digits have the same advance width; */
/* digit `0' is 0x30 in all supported charmaps */
for ( i = 0x30; i <= 0x39; i++ )
{
FT_UInt glyph_index;
glyph_index = FT_Get_Char_Index( face, i );
if ( glyph_index == 0 )
continue;
if ( FT_Get_Advance( face, glyph_index,
FT_LOAD_NO_SCALE |
FT_LOAD_NO_HINTING |
FT_LOAD_IGNORE_TRANSFORM,
&advance ) )
continue;
if ( started )
{
if ( advance != old_advance )
{
same_width = 0;
break;
}
}
else
{
old_advance = advance;
started = 1;
}
}
metrics->root.digits_have_same_width = same_width;
}
FT_LOCAL_DEF( FT_Error )
af_cjk_metrics_init( AF_LatinMetrics metrics,
FT_Face face )
af_cjk_metrics_init( AF_CJKMetrics metrics,
FT_Face face )
{
FT_CharMap oldmap = face->charmap;
metrics->units_per_em = face->units_per_EM;
/* TODO are there blues? */
if ( FT_Select_Charmap( face, FT_ENCODING_UNICODE ) )
face->charmap = NULL;
else
{
/* latin's version would suffice */
af_latin_metrics_init_widths( metrics, face, 0x7530 );
af_latin_metrics_check_digits( metrics, face );
af_cjk_metrics_init_widths( metrics, face, 0x7530 );
af_cjk_metrics_init_blues( metrics, face, af_cjk_hani_blue_chars );
af_cjk_metrics_check_digits( metrics, face );
}
FT_Set_Charmap( face, oldmap );
@ -72,31 +545,99 @@
static void
af_cjk_metrics_scale_dim( AF_LatinMetrics metrics,
AF_Scaler scaler,
AF_Dimension dim )
af_cjk_metrics_scale_dim( AF_CJKMetrics metrics,
AF_Scaler scaler,
AF_Dimension dim )
{
AF_LatinAxis axis;
FT_Fixed scale;
FT_Pos delta;
AF_CJKAxis axis;
FT_UInt nn;
axis = &metrics->axis[dim];
if ( dim == AF_DIMENSION_HORZ )
{
axis->scale = scaler->x_scale;
axis->delta = scaler->x_delta;
scale = scaler->x_scale;
delta = scaler->x_delta;
}
else
{
axis->scale = scaler->y_scale;
axis->delta = scaler->y_delta;
scale = scaler->y_scale;
delta = scaler->y_delta;
}
if ( axis->org_scale == scale && axis->org_delta == delta )
return;
axis->org_scale = scale;
axis->org_delta = delta;
axis->scale = scale;
axis->delta = delta;
/* scale the blue zones */
for ( nn = 0; nn < axis->blue_count; nn++ )
{
AF_CJKBlue blue = &axis->blues[nn];
FT_Pos dist;
blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta;
blue->ref.fit = blue->ref.cur;
blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta;
blue->shoot.fit = blue->shoot.cur;
blue->flags &= ~AF_CJK_BLUE_ACTIVE;
/* a blue zone is only active if it is less than 3/4 pixels tall */
dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale );
if ( dist <= 48 && dist >= -48 )
{
FT_Pos delta1, delta2;
blue->ref.fit = FT_PIX_ROUND( blue->ref.cur );
/* shoot is under shoot for cjk */
delta1 = FT_DivFix(blue->ref.fit, scale) - blue->shoot.org;
delta2 = delta1;
if ( delta1 < 0 )
delta2 = -delta2;
delta2 = FT_MulFix( delta2, scale );
FT_TRACE5(( "delta: %d", delta1 ));
if ( delta2 < 32 )
delta2 = 0;
/*
else if ( delta2 < 64 )
delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 );
*/
else
delta2 = FT_PIX_ROUND( delta2 );
FT_TRACE5(( "/%d\n", delta2 ));
if ( delta1 < 0 )
delta2 = -delta2;
blue->shoot.fit = blue->ref.fit - delta2;
FT_TRACE5(( ">> active cjk blue zone %c%d[%ld/%ld]: "
"ref: cur=%.2f fit=%.2f shoot: cur=%.2f fit=%.2f\n",
( dim == AF_DIMENSION_HORZ ) ? 'H':'V',
nn, blue->ref.org, blue->shoot.org,
blue->ref.cur/64.0, blue->ref.fit/64.0,
blue->shoot.cur/64.0, blue->shoot.fit/64.0 ));
blue->flags |= AF_CJK_BLUE_ACTIVE;
}
}
}
FT_LOCAL_DEF( void )
af_cjk_metrics_scale( AF_LatinMetrics metrics,
AF_Scaler scaler )
af_cjk_metrics_scale( AF_CJKMetrics metrics,
AF_Scaler scaler )
{
metrics->root.scaler = *scaler;
@ -329,7 +870,7 @@
AF_AxisHints axis = &hints->axis[dim];
FT_Error error = AF_Err_Ok;
FT_Memory memory = hints->memory;
AF_LatinAxis laxis = &((AF_LatinMetrics)hints->metrics)->axis[dim];
AF_CJKAxis laxis = &((AF_CJKMetrics)hints->metrics)->axis[dim];
AF_Segment segments = axis->segments;
AF_Segment segment_limit = segments + axis->num_segments;
@ -601,9 +1142,93 @@
}
FT_LOCAL_DEF( void )
af_cjk_hints_compute_blue_edges( AF_GlyphHints hints,
AF_CJKMetrics metrics,
AF_Dimension dim )
{
AF_AxisHints axis = &hints->axis[ dim ];
AF_Edge edge = axis->edges;
AF_Edge edge_limit = edge + axis->num_edges;
AF_CJKAxis cjk = &metrics->axis[ dim ];
FT_Fixed scale = cjk->scale;
FT_Pos best_dist0; /* initial threshold */
/* compute the initial threshold as a fraction of the EM size */
best_dist0 = FT_MulFix( metrics->units_per_em / 40, scale );
if ( best_dist0 > 64 / 2 ) /* Maximum 1/2 pixel */
best_dist0 = 64 / 2;
/* compute which blue zones are active, i.e. have their scaled */
/* size < 3/4 pixels */
/* If the distant between an edge and a blue zone is shorter than
* best_dist0, set the blue zone for the edge. Then search for
* the blue zone with the smallest best_dist to the edge. */
for ( ; edge < edge_limit; edge++ )
{
FT_UInt bb;
AF_Width best_blue = NULL;
FT_Pos best_dist = best_dist0;
for ( bb = 0; bb < cjk->blue_count; bb++ )
{
AF_CJKBlue blue = cjk->blues + bb;
FT_Bool is_top_right_blue, is_major_dir;
/* skip inactive blue zones (i.e., those that are too small) */
if ( !( blue->flags & AF_CJK_BLUE_ACTIVE ) )
continue;
/* if it is a top zone, check for right edges -- if it is a bottom */
/* zone, check for left edges */
/* */
/* of course, that's for TrueType */
is_top_right_blue = FT_BOOL( ( ( blue->flags & AF_CJK_BLUE_IS_TOP ) != 0 ) ||
( ( blue->flags & AF_CJK_BLUE_IS_RIGHT ) != 0 ) );
is_major_dir = FT_BOOL( edge->dir == axis->major_dir );
/* 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 */
/* direction */
if ( is_top_right_blue ^ is_major_dir )
{
FT_Pos dist;
AF_Width compare;
/* Compare the edge to the closest blue zone type */
if ( FT_ABS( edge->fpos - blue->ref.org ) >
FT_ABS( edge->fpos - blue->shoot.org ) )
compare = &blue->shoot;
else
compare = &blue->ref;
dist = edge->fpos - compare->org;
if (dist < 0)
dist = -dist;
dist = FT_MulFix( dist, scale );
if ( dist < best_dist )
{
best_dist = dist;
best_blue = compare;
}
}
}
if ( best_blue )
edge->blue_edge = best_blue;
}
}
FT_LOCAL_DEF( FT_Error )
af_cjk_hints_init( AF_GlyphHints hints,
AF_LatinMetrics metrics )
AF_CJKMetrics metrics )
{
FT_Render_Mode mode;
FT_UInt32 scaler_flags, other_flags;
@ -728,11 +1353,11 @@
AF_Edge_Flags base_flags,
AF_Edge_Flags stem_flags )
{
AF_LatinMetrics metrics = (AF_LatinMetrics) hints->metrics;
AF_LatinAxis axis = & metrics->axis[dim];
AF_CJKMetrics metrics = (AF_CJKMetrics) hints->metrics;
AF_CJKAxis axis = & metrics->axis[dim];
FT_Pos dist = width;
FT_Int sign = 0;
FT_Int vertical = ( dim == AF_DIMENSION_VERT );
FT_Bool vertical = FT_BOOL( dim == AF_DIMENSION_VERT );
FT_UNUSED( base_flags );
FT_UNUSED( stem_flags );
@ -1029,6 +1654,58 @@
FT_Pos last_stem_pos = 0;
/* we begin by aligning all stems relative to the blue zone */
FT_TRACE5(( "==== cjk hinting %s edges =====\n",
dim == AF_DIMENSION_HORZ ? "vertical" : "horizontal" ));
if ( AF_HINTS_DO_BLUES( hints ) )
{
for ( edge = edges; edge < edge_limit; edge++ )
{
AF_Width blue;
AF_Edge edge1, edge2;
if ( edge->flags & AF_EDGE_DONE )
continue;
blue = edge->blue_edge;
edge1 = NULL;
edge2 = edge->link;
if ( blue )
{
edge1 = edge;
}
else if ( edge2 && edge2->blue_edge )
{
blue = edge2->blue_edge;
edge1 = edge2;
edge2 = edge;
}
if ( !edge1 )
continue;
FT_TRACE5(( "CJKBLUE: edge %d @%d (opos=%.2f) snapped to (%.2f), "
"was (%.2f)\n",
edge1-edges, edge1->fpos, edge1->opos / 64.0, blue->fit / 64.0,
edge1->pos / 64.0 ));
edge1->pos = blue->fit;
edge1->flags |= AF_EDGE_DONE;
if ( edge2 && !edge2->blue_edge )
{
af_cjk_align_linked_edge( hints, dim, edge1, edge2 );
edge2->flags |= AF_EDGE_DONE;
}
if ( !anchor )
anchor = edge;
}
}
/* now we align all stem edges. */
for ( edge = edges; edge < edge_limit; edge++ )
{
@ -1063,6 +1740,15 @@
}
/* now align the stem */
/* this should not happen, but it's better to be safe */
if ( edge2->blue_edge )
{
FT_TRACE5(( "ASSERTION FAILED for edge %d\n", edge2-edges ));
af_cjk_align_linked_edge( hints, dim, edge2, edge );
edge->flags |= AF_EDGE_DONE;
continue;
}
if ( edge2 < edge )
{
@ -1389,7 +2075,7 @@
FT_LOCAL_DEF( FT_Error )
af_cjk_hints_apply( AF_GlyphHints hints,
FT_Outline* outline,
AF_LatinMetrics metrics )
AF_CJKMetrics metrics )
{
FT_Error error;
int dim;
@ -1407,6 +2093,8 @@
error = af_cjk_hints_detect_features( hints, AF_DIMENSION_HORZ );
if ( error )
goto Exit;
af_cjk_hints_compute_blue_edges( hints, metrics, AF_DIMENSION_HORZ );
}
if ( AF_HINTS_DO_VERTICAL( hints ) )
@ -1414,6 +2102,8 @@
error = af_cjk_hints_detect_features( hints, AF_DIMENSION_VERT );
if ( error )
goto Exit;
af_cjk_hints_compute_blue_edges( hints, metrics, AF_DIMENSION_VERT );
}
/* grid-fit the outline */
@ -1512,7 +2202,7 @@
AF_SCRIPT_CJK,
af_cjk_uniranges,
sizeof( AF_LatinMetricsRec ),
sizeof( AF_CJKMetricsRec ),
(AF_Script_InitMetricsFunc) af_cjk_metrics_init,
(AF_Script_ScaleMetricsFunc)af_cjk_metrics_scale,
@ -1534,7 +2224,7 @@
AF_SCRIPT_CJK,
af_cjk_uniranges,
sizeof( AF_LatinMetricsRec ),
sizeof( AF_CJKMetricsRec ),
(AF_Script_InitMetricsFunc) NULL,
(AF_Script_ScaleMetricsFunc)NULL,

89
src/autofit/afcjk.h
View File

@ -20,6 +20,7 @@
#define __AFCJK_H__
#include "afhints.h"
#include "aflatin.h"
FT_BEGIN_HEADER
@ -29,23 +30,103 @@ FT_BEGIN_HEADER
AF_DECLARE_SCRIPT_CLASS(af_cjk_script_class)
/* CJK (global) metrics management */
/*
* CJK glyphs tend to fill the square. So we have both verticle and
* horizontal blue zones. But some glyphs have flat bounding stroke that
* leave some space between neighbour glyphs.
*/
enum
{
AF_CJK_BLUE_TOP,
AF_CJK_BLUE_BOTTOM,
AF_CJK_BLUE_LEFT,
AF_CJK_BLUE_RIGHT,
AF_CJK_BLUE_MAX
};
#define AF_CJK_MAX_WIDTHS 16
#define AF_CJK_MAX_BLUES AF_CJK_BLUE_MAX
enum
{
AF_CJK_BLUE_ACTIVE = 1 << 0,
AF_CJK_BLUE_IS_TOP = 1 << 1,
AF_CJK_BLUE_IS_RIGHT = 1 << 2,
AF_CJK_BLUE_ADJUSTMENT = 1 << 3, /* used for scale adjustment */
/* optimization */
AF_CJK_BLUE_FLAG_MAX
};
typedef struct AF_CJKBlueRec_
{
AF_WidthRec ref;
AF_WidthRec shoot; /* undershoot */
FT_UInt flags;
} AF_CJKBlueRec, *AF_CJKBlue;
typedef struct AF_CJKAxisRec_
{
FT_Fixed scale;
FT_Pos delta;
FT_UInt width_count;
AF_WidthRec widths[AF_CJK_MAX_WIDTHS];
FT_Pos edge_distance_threshold;
FT_Pos standard_width;
FT_Bool extra_light;
/* used for horizontal metrics too for CJK */
FT_Bool control_overshoot;
FT_UInt blue_count;
AF_CJKBlueRec blues[AF_CJK_BLUE_MAX];
FT_Fixed org_scale;
FT_Pos org_delta;
} AF_CJKAxisRec, *AF_CJKAxis;
typedef struct AF_CJKMetricsRec_
{
AF_ScriptMetricsRec root;
FT_UInt units_per_em;
AF_CJKAxisRec axis[AF_DIMENSION_MAX];
} AF_CJKMetricsRec, *AF_CJKMetrics;
FT_LOCAL( FT_Error )
af_cjk_metrics_init( AF_LatinMetrics metrics,
af_cjk_metrics_init( AF_CJKMetrics metrics,
FT_Face face );
FT_LOCAL( void )
af_cjk_metrics_scale( AF_LatinMetrics metrics,
af_cjk_metrics_scale( AF_CJKMetrics metrics,
AF_Scaler scaler );
FT_LOCAL( FT_Error )
af_cjk_hints_init( AF_GlyphHints hints,
AF_LatinMetrics metrics );
AF_CJKMetrics metrics );
FT_LOCAL( FT_Error )
af_cjk_hints_apply( AF_GlyphHints hints,
FT_Outline* outline,
AF_LatinMetrics metrics );
AF_CJKMetrics metrics );
/* Shared. called from afindic.c */
FT_LOCAL( void )
af_cjk_metrics_check_digits( AF_CJKMetrics metrics,
FT_Face face );
FT_LOCAL( void )
af_cjk_metrics_init_widths( AF_CJKMetrics metrics,
FT_Face face,
FT_ULong charcode );
/* */

35
src/autofit/afindic.c
View File

@ -33,16 +33,35 @@
static FT_Error
af_indic_metrics_init( AF_LatinMetrics metrics,
af_indic_metrics_init( AF_CJKMetrics metrics,
FT_Face face )
{
/* use CJK routines */
return af_cjk_metrics_init( metrics, face );
/* skip blue zone init in CJK routines */
FT_CharMap oldmap = face->charmap;
metrics->units_per_em = face->units_per_EM;
if ( FT_Select_Charmap( face, FT_ENCODING_UNICODE ) )
face->charmap = NULL;
else
{
af_cjk_metrics_init_widths( metrics, face, 0x7530 );
#if 0
/* either need indic specific blue_chars[] or just skip blue zones. */
af_cjk_metrics_init_blues( metrics, face, af_cjk_blue_chars );
#endif
af_cjk_metrics_check_digits( metrics, face );
}
FT_Set_Charmap( face, oldmap );
return AF_Err_Ok;
}
static void
af_indic_metrics_scale( AF_LatinMetrics metrics,
af_indic_metrics_scale( AF_CJKMetrics metrics,
AF_Scaler scaler )
{
/* use CJK routines */
@ -52,7 +71,7 @@
static FT_Error
af_indic_hints_init( AF_GlyphHints hints,
AF_LatinMetrics metrics )
AF_CJKMetrics metrics )
{
/* use CJK routines */
return af_cjk_hints_init( hints, metrics );
@ -62,7 +81,7 @@
static FT_Error
af_indic_hints_apply( AF_GlyphHints hints,
FT_Outline* outline,
AF_LatinMetrics metrics)
AF_CJKMetrics metrics)
{
/* use CJK routines */
return af_cjk_hints_apply( hints, outline, metrics );
@ -98,7 +117,7 @@
AF_SCRIPT_INDIC,
af_indic_uniranges,
sizeof( AF_LatinMetricsRec ),
sizeof( AF_CJKMetricsRec ),
(AF_Script_InitMetricsFunc) af_indic_metrics_init,
(AF_Script_ScaleMetricsFunc)af_indic_metrics_scale,
@ -120,7 +139,7 @@
AF_SCRIPT_INDIC,
af_indic_uniranges,
sizeof( AF_LatinMetricsRec ),
sizeof( AF_CJKMetricsRec ),
(AF_Script_InitMetricsFunc) NULL,
(AF_Script_ScaleMetricsFunc)NULL,