0,0 → 1,2275 |
/***************************************************************************/ |
/* */ |
/* afcjk.c */ |
/* */ |
/* Auto-fitter hinting routines for CJK script (body). */ |
/* */ |
/* Copyright 2006-2013 by */ |
/* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
/* */ |
/* This file is part of the FreeType project, and may only be used, */ |
/* modified, and distributed under the terms of the FreeType project */ |
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
/* this file you indicate that you have read the license and */ |
/* understand and accept it fully. */ |
/* */ |
/***************************************************************************/ |
|
/* |
* The algorithm is based on akito's autohint patch, available here: |
* |
* http://www.kde.gr.jp/~akito/patch/freetype2/ |
* |
*/ |
|
#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" |
|
|
#ifdef AF_CONFIG_OPTION_USE_WARPER |
#include "afwarp.h" |
#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 |
|
|
/*************************************************************************/ |
/*************************************************************************/ |
/***** *****/ |
/***** C J K G L O B A L M E T R I C S *****/ |
/***** *****/ |
/*************************************************************************/ |
/*************************************************************************/ |
|
|
/* 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 ) |
{ |
/* 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, |
metrics->root.clazz->standard_char ); |
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; |
} |
} |
|
/* this also replaces multiple almost identical stem widths */ |
/* with a single one (the value 100 is heuristic) */ |
af_sort_and_quantize_widths( &num_widths, axis->widths, |
dummy->units_per_em / 100 ); |
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 |
|
|
/* Each blue zone has two types of fill and unfill, this is, */ |
/* filling the entire glyph 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; |
|
#ifdef FT_DEBUG_LEVEL_TRACE |
FT_String* cjk_blue_name[AF_CJK_BLUE_MAX] = { |
(FT_String*)"top", |
(FT_String*)"bottom", |
(FT_String*)"left", |
(FT_String*)"right" |
}; |
FT_String* cjk_blue_type_name[AF_CJK_BLUE_TYPE_MAX] = { |
(FT_String*)"filled", |
(FT_String*)"unfilled" |
}; |
#endif |
|
|
/* We compute the blues simply by loading each character from the */ |
/* `blue_chars[blues]' string, then computing 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 %s/%s\n", cjk_blue_name[bb], |
cjk_blue_type_name[fill_type] )); |
|
|
for ( ; p < limit && *p; p++ ) |
{ |
FT_UInt glyph_index; |
FT_Pos best_pos; /* same as points.y */ |
FT_Int best_point; |
FT_Vector* points; |
|
|
FT_TRACE5(( " U+%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 ) |
{ |
FT_TRACE5(( "unavailable\n" )); |
continue; |
} |
|
error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE ); |
if ( error || glyph->outline.n_points <= 0 ) |
{ |
FT_TRACE5(( "no outline\n" )); |
continue; |
} |
|
/* now compute min or max point indices and coordinates */ |
points = glyph->outline.points; |
best_point = -1; |
best_pos = 0; /* make compiler happy */ |
|
{ |
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 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: |
; |
} |
} |
FT_TRACE5(( "best_pos=%5ld\n", best_pos )); |
} |
|
if ( fill ) |
fills[num_fills++] = best_pos; |
else |
flats[num_flats++] = best_pos; |
} |
} |
|
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 */ |
/* vice versa 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 %s bluezone ref = %ld shoot = %ld\n", |
cjk_blue_name[bb], *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_CJKMetrics metrics, |
FT_Face face ) |
{ |
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 ); |
af_cjk_metrics_init_blues( metrics, face, af_cjk_hani_blue_chars ); |
af_cjk_metrics_check_digits( metrics, face ); |
} |
|
FT_Set_Charmap( face, oldmap ); |
|
return FT_Err_Ok; |
} |
|
|
static void |
af_cjk_metrics_scale_dim( AF_CJKMetrics metrics, |
AF_Scaler scaler, |
AF_Dimension dim ) |
{ |
FT_Fixed scale; |
FT_Pos delta; |
AF_CJKAxis axis; |
FT_UInt nn; |
|
|
axis = &metrics->axis[dim]; |
|
if ( dim == AF_DIMENSION_HORZ ) |
{ |
scale = scaler->x_scale; |
delta = scaler->x_delta; |
} |
else |
{ |
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; |
#if 0 |
else if ( delta2 < 64 ) |
delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 ); |
#endif |
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_CJKMetrics metrics, |
AF_Scaler scaler ) |
{ |
metrics->root.scaler = *scaler; |
|
af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ ); |
af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT ); |
} |
|
|
/*************************************************************************/ |
/*************************************************************************/ |
/***** *****/ |
/***** C J K G L Y P H A N A L Y S I S *****/ |
/***** *****/ |
/*************************************************************************/ |
/*************************************************************************/ |
|
static FT_Error |
af_cjk_hints_compute_segments( AF_GlyphHints hints, |
AF_Dimension dim ) |
{ |
AF_AxisHints axis = &hints->axis[dim]; |
AF_Segment segments = axis->segments; |
AF_Segment segment_limit = segments + axis->num_segments; |
FT_Error error; |
AF_Segment seg; |
|
|
error = af_latin_hints_compute_segments( hints, dim ); |
if ( error ) |
return error; |
|
/* a segment is round if it doesn't have successive */ |
/* on-curve points. */ |
for ( seg = segments; seg < segment_limit; seg++ ) |
{ |
AF_Point pt = seg->first; |
AF_Point last = seg->last; |
AF_Flags f0 = (AF_Flags)( pt->flags & AF_FLAG_CONTROL ); |
AF_Flags f1; |
|
|
seg->flags &= ~AF_EDGE_ROUND; |
|
for ( ; pt != last; f0 = f1 ) |
{ |
pt = pt->next; |
f1 = (AF_Flags)( pt->flags & AF_FLAG_CONTROL ); |
|
if ( !f0 && !f1 ) |
break; |
|
if ( pt == last ) |
seg->flags |= AF_EDGE_ROUND; |
} |
} |
|
return FT_Err_Ok; |
} |
|
|
static void |
af_cjk_hints_link_segments( AF_GlyphHints hints, |
AF_Dimension dim ) |
{ |
AF_AxisHints axis = &hints->axis[dim]; |
AF_Segment segments = axis->segments; |
AF_Segment segment_limit = segments + axis->num_segments; |
AF_Direction major_dir = axis->major_dir; |
AF_Segment seg1, seg2; |
FT_Pos len_threshold; |
FT_Pos dist_threshold; |
|
|
len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 ); |
|
dist_threshold = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale |
: hints->y_scale; |
dist_threshold = FT_DivFix( 64 * 3, dist_threshold ); |
|
/* now compare each segment to the others */ |
for ( seg1 = segments; seg1 < segment_limit; seg1++ ) |
{ |
/* the fake segments are for metrics hinting only */ |
if ( seg1->first == seg1->last ) |
continue; |
|
if ( seg1->dir != major_dir ) |
continue; |
|
for ( seg2 = segments; seg2 < segment_limit; seg2++ ) |
if ( seg2 != seg1 && seg1->dir + seg2->dir == 0 ) |
{ |
FT_Pos dist = seg2->pos - seg1->pos; |
|
|
if ( dist < 0 ) |
continue; |
|
{ |
FT_Pos min = seg1->min_coord; |
FT_Pos max = seg1->max_coord; |
FT_Pos len; |
|
|
if ( min < seg2->min_coord ) |
min = seg2->min_coord; |
|
if ( max > seg2->max_coord ) |
max = seg2->max_coord; |
|
len = max - min; |
if ( len >= len_threshold ) |
{ |
if ( dist * 8 < seg1->score * 9 && |
( dist * 8 < seg1->score * 7 || seg1->len < len ) ) |
{ |
seg1->score = dist; |
seg1->len = len; |
seg1->link = seg2; |
} |
|
if ( dist * 8 < seg2->score * 9 && |
( dist * 8 < seg2->score * 7 || seg2->len < len ) ) |
{ |
seg2->score = dist; |
seg2->len = len; |
seg2->link = seg1; |
} |
} |
} |
} |
} |
|
/* |
* now compute the `serif' segments |
* |
* In Hanzi, some strokes are wider on one or both of the ends. |
* We either identify the stems on the ends as serifs or remove |
* the linkage, depending on the length of the stems. |
* |
*/ |
|
{ |
AF_Segment link1, link2; |
|
|
for ( seg1 = segments; seg1 < segment_limit; seg1++ ) |
{ |
link1 = seg1->link; |
if ( !link1 || link1->link != seg1 || link1->pos <= seg1->pos ) |
continue; |
|
if ( seg1->score >= dist_threshold ) |
continue; |
|
for ( seg2 = segments; seg2 < segment_limit; seg2++ ) |
{ |
if ( seg2->pos > seg1->pos || seg1 == seg2 ) |
continue; |
|
link2 = seg2->link; |
if ( !link2 || link2->link != seg2 || link2->pos < link1->pos ) |
continue; |
|
if ( seg1->pos == seg2->pos && link1->pos == link2->pos ) |
continue; |
|
if ( seg2->score <= seg1->score || seg1->score * 4 <= seg2->score ) |
continue; |
|
/* seg2 < seg1 < link1 < link2 */ |
|
if ( seg1->len >= seg2->len * 3 ) |
{ |
AF_Segment seg; |
|
|
for ( seg = segments; seg < segment_limit; seg++ ) |
{ |
AF_Segment link = seg->link; |
|
|
if ( link == seg2 ) |
{ |
seg->link = 0; |
seg->serif = link1; |
} |
else if ( link == link2 ) |
{ |
seg->link = 0; |
seg->serif = seg1; |
} |
} |
} |
else |
{ |
seg1->link = link1->link = 0; |
|
break; |
} |
} |
} |
} |
|
for ( seg1 = segments; seg1 < segment_limit; seg1++ ) |
{ |
seg2 = seg1->link; |
|
if ( seg2 ) |
{ |
seg2->num_linked++; |
if ( seg2->link != seg1 ) |
{ |
seg1->link = 0; |
|
if ( seg2->score < dist_threshold || seg1->score < seg2->score * 4 ) |
seg1->serif = seg2->link; |
else |
seg2->num_linked--; |
} |
} |
} |
} |
|
|
static FT_Error |
af_cjk_hints_compute_edges( AF_GlyphHints hints, |
AF_Dimension dim ) |
{ |
AF_AxisHints axis = &hints->axis[dim]; |
FT_Error error = FT_Err_Ok; |
FT_Memory memory = hints->memory; |
AF_CJKAxis laxis = &((AF_CJKMetrics)hints->metrics)->axis[dim]; |
|
AF_Segment segments = axis->segments; |
AF_Segment segment_limit = segments + axis->num_segments; |
AF_Segment seg; |
|
FT_Fixed scale; |
FT_Pos edge_distance_threshold; |
|
|
axis->num_edges = 0; |
|
scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale |
: hints->y_scale; |
|
/*********************************************************************/ |
/* */ |
/* We begin by generating a sorted table of edges for the current */ |
/* direction. To do so, we simply scan each segment and try to find */ |
/* an edge in our table that corresponds to its position. */ |
/* */ |
/* If no edge is found, we create and insert a new edge in the */ |
/* sorted table. Otherwise, we simply add the segment to the edge's */ |
/* list which is then processed in the second step to compute the */ |
/* edge's properties. */ |
/* */ |
/* Note that the edges table is sorted along the segment/edge */ |
/* position. */ |
/* */ |
/*********************************************************************/ |
|
edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold, |
scale ); |
if ( edge_distance_threshold > 64 / 4 ) |
edge_distance_threshold = FT_DivFix( 64 / 4, scale ); |
else |
edge_distance_threshold = laxis->edge_distance_threshold; |
|
for ( seg = segments; seg < segment_limit; seg++ ) |
{ |
AF_Edge found = 0; |
FT_Pos best = 0xFFFFU; |
FT_Int ee; |
|
|
/* look for an edge corresponding to the segment */ |
for ( ee = 0; ee < axis->num_edges; ee++ ) |
{ |
AF_Edge edge = axis->edges + ee; |
FT_Pos dist; |
|
|
if ( edge->dir != seg->dir ) |
continue; |
|
dist = seg->pos - edge->fpos; |
if ( dist < 0 ) |
dist = -dist; |
|
if ( dist < edge_distance_threshold && dist < best ) |
{ |
AF_Segment link = seg->link; |
|
|
/* check whether all linked segments of the candidate edge */ |
/* can make a single edge. */ |
if ( link ) |
{ |
AF_Segment seg1 = edge->first; |
FT_Pos dist2 = 0; |
|
|
do |
{ |
AF_Segment link1 = seg1->link; |
|
|
if ( link1 ) |
{ |
dist2 = AF_SEGMENT_DIST( link, link1 ); |
if ( dist2 >= edge_distance_threshold ) |
break; |
} |
|
} while ( ( seg1 = seg1->edge_next ) != edge->first ); |
|
if ( dist2 >= edge_distance_threshold ) |
continue; |
} |
|
best = dist; |
found = edge; |
} |
} |
|
if ( !found ) |
{ |
AF_Edge edge; |
|
|
/* insert a new edge in the list and */ |
/* sort according to the position */ |
error = af_axis_hints_new_edge( axis, seg->pos, |
(AF_Direction)seg->dir, |
memory, &edge ); |
if ( error ) |
goto Exit; |
|
/* add the segment to the new edge's list */ |
FT_ZERO( edge ); |
|
edge->first = seg; |
edge->last = seg; |
edge->fpos = seg->pos; |
edge->opos = edge->pos = FT_MulFix( seg->pos, scale ); |
seg->edge_next = seg; |
edge->dir = seg->dir; |
} |
else |
{ |
/* if an edge was found, simply add the segment to the edge's */ |
/* list */ |
seg->edge_next = found->first; |
found->last->edge_next = seg; |
found->last = seg; |
} |
} |
|
/*********************************************************************/ |
/* */ |
/* Good, we now compute each edge's properties according to segments */ |
/* found on its position. Basically, these are as follows. */ |
/* */ |
/* - edge's main direction */ |
/* - stem edge, serif edge or both (which defaults to stem then) */ |
/* - rounded edge, straight or both (which defaults to straight) */ |
/* - link for edge */ |
/* */ |
/*********************************************************************/ |
|
/* first of all, set the `edge' field in each segment -- this is */ |
/* required in order to compute edge links */ |
/* */ |
/* Note that removing this loop and setting the `edge' field of each */ |
/* segment directly in the code above slows down execution speed for */ |
/* some reasons on platforms like the Sun. */ |
|
{ |
AF_Edge edges = axis->edges; |
AF_Edge edge_limit = edges + axis->num_edges; |
AF_Edge edge; |
|
|
for ( edge = edges; edge < edge_limit; edge++ ) |
{ |
seg = edge->first; |
if ( seg ) |
do |
{ |
seg->edge = edge; |
seg = seg->edge_next; |
|
} while ( seg != edge->first ); |
} |
|
/* now compute each edge properties */ |
for ( edge = edges; edge < edge_limit; edge++ ) |
{ |
FT_Int is_round = 0; /* does it contain round segments? */ |
FT_Int is_straight = 0; /* does it contain straight segments? */ |
|
|
seg = edge->first; |
|
do |
{ |
FT_Bool is_serif; |
|
|
/* check for roundness of segment */ |
if ( seg->flags & AF_EDGE_ROUND ) |
is_round++; |
else |
is_straight++; |
|
/* check for links -- if seg->serif is set, then seg->link must */ |
/* be ignored */ |
is_serif = (FT_Bool)( seg->serif && seg->serif->edge != edge ); |
|
if ( seg->link || is_serif ) |
{ |
AF_Edge edge2; |
AF_Segment seg2; |
|
|
edge2 = edge->link; |
seg2 = seg->link; |
|
if ( is_serif ) |
{ |
seg2 = seg->serif; |
edge2 = edge->serif; |
} |
|
if ( edge2 ) |
{ |
FT_Pos edge_delta; |
FT_Pos seg_delta; |
|
|
edge_delta = edge->fpos - edge2->fpos; |
if ( edge_delta < 0 ) |
edge_delta = -edge_delta; |
|
seg_delta = AF_SEGMENT_DIST( seg, seg2 ); |
|
if ( seg_delta < edge_delta ) |
edge2 = seg2->edge; |
} |
else |
edge2 = seg2->edge; |
|
if ( is_serif ) |
{ |
edge->serif = edge2; |
edge2->flags |= AF_EDGE_SERIF; |
} |
else |
edge->link = edge2; |
} |
|
seg = seg->edge_next; |
|
} while ( seg != edge->first ); |
|
/* set the round/straight flags */ |
edge->flags = AF_EDGE_NORMAL; |
|
if ( is_round > 0 && is_round >= is_straight ) |
edge->flags |= AF_EDGE_ROUND; |
|
/* get rid of serifs if link is set */ |
/* XXX: This gets rid of many unpleasant artefacts! */ |
/* Example: the `c' in cour.pfa at size 13 */ |
|
if ( edge->serif && edge->link ) |
edge->serif = 0; |
} |
} |
|
Exit: |
return error; |
} |
|
|
static FT_Error |
af_cjk_hints_detect_features( AF_GlyphHints hints, |
AF_Dimension dim ) |
{ |
FT_Error error; |
|
|
error = af_cjk_hints_compute_segments( hints, dim ); |
if ( !error ) |
{ |
af_cjk_hints_link_segments( hints, dim ); |
|
error = af_cjk_hints_compute_edges( hints, dim ); |
} |
return error; |
} |
|
|
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_CJKMetrics metrics ) |
{ |
FT_Render_Mode mode; |
FT_UInt32 scaler_flags, other_flags; |
|
|
af_glyph_hints_rescale( hints, (AF_ScriptMetrics)metrics ); |
|
/* |
* correct x_scale and y_scale when needed, since they may have |
* been modified af_cjk_scale_dim above |
*/ |
hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale; |
hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta; |
hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale; |
hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta; |
|
/* compute flags depending on render mode, etc. */ |
mode = metrics->root.scaler.render_mode; |
|
#ifdef AF_CONFIG_OPTION_USE_WARPER |
if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V ) |
metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL; |
#endif |
|
scaler_flags = hints->scaler_flags; |
other_flags = 0; |
|
/* |
* We snap the width of vertical stems for the monochrome and |
* horizontal LCD rendering targets only. |
*/ |
if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD ) |
other_flags |= AF_LATIN_HINTS_HORZ_SNAP; |
|
/* |
* We snap the width of horizontal stems for the monochrome and |
* vertical LCD rendering targets only. |
*/ |
if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V ) |
other_flags |= AF_LATIN_HINTS_VERT_SNAP; |
|
/* |
* We adjust stems to full pixels only if we don't use the `light' mode. |
*/ |
if ( mode != FT_RENDER_MODE_LIGHT ) |
other_flags |= AF_LATIN_HINTS_STEM_ADJUST; |
|
if ( mode == FT_RENDER_MODE_MONO ) |
other_flags |= AF_LATIN_HINTS_MONO; |
|
scaler_flags |= AF_SCALER_FLAG_NO_ADVANCE; |
|
hints->scaler_flags = scaler_flags; |
hints->other_flags = other_flags; |
|
return 0; |
} |
|
|
/*************************************************************************/ |
/*************************************************************************/ |
/***** *****/ |
/***** C J K G L Y P H G R I D - F I T T I N G *****/ |
/***** *****/ |
/*************************************************************************/ |
/*************************************************************************/ |
|
/* snap a given width in scaled coordinates to one of the */ |
/* current standard widths */ |
|
static FT_Pos |
af_cjk_snap_width( AF_Width widths, |
FT_Int count, |
FT_Pos width ) |
{ |
int n; |
FT_Pos best = 64 + 32 + 2; |
FT_Pos reference = width; |
FT_Pos scaled; |
|
|
for ( n = 0; n < count; n++ ) |
{ |
FT_Pos w; |
FT_Pos dist; |
|
|
w = widths[n].cur; |
dist = width - w; |
if ( dist < 0 ) |
dist = -dist; |
if ( dist < best ) |
{ |
best = dist; |
reference = w; |
} |
} |
|
scaled = FT_PIX_ROUND( reference ); |
|
if ( width >= reference ) |
{ |
if ( width < scaled + 48 ) |
width = reference; |
} |
else |
{ |
if ( width > scaled - 48 ) |
width = reference; |
} |
|
return width; |
} |
|
|
/* compute the snapped width of a given stem */ |
|
static FT_Pos |
af_cjk_compute_stem_width( AF_GlyphHints hints, |
AF_Dimension dim, |
FT_Pos width, |
AF_Edge_Flags base_flags, |
AF_Edge_Flags stem_flags ) |
{ |
AF_CJKMetrics metrics = (AF_CJKMetrics) hints->metrics; |
AF_CJKAxis axis = & metrics->axis[dim]; |
FT_Pos dist = width; |
FT_Int sign = 0; |
FT_Bool vertical = FT_BOOL( dim == AF_DIMENSION_VERT ); |
|
FT_UNUSED( base_flags ); |
FT_UNUSED( stem_flags ); |
|
|
if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ) |
return width; |
|
if ( dist < 0 ) |
{ |
dist = -width; |
sign = 1; |
} |
|
if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) || |
( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) ) |
{ |
/* smooth hinting process: very lightly quantize the stem width */ |
|
if ( axis->width_count > 0 ) |
{ |
if ( FT_ABS( dist - axis->widths[0].cur ) < 40 ) |
{ |
dist = axis->widths[0].cur; |
if ( dist < 48 ) |
dist = 48; |
|
goto Done_Width; |
} |
} |
|
if ( dist < 54 ) |
dist += ( 54 - dist ) / 2 ; |
else if ( dist < 3 * 64 ) |
{ |
FT_Pos delta; |
|
|
delta = dist & 63; |
dist &= -64; |
|
if ( delta < 10 ) |
dist += delta; |
else if ( delta < 22 ) |
dist += 10; |
else if ( delta < 42 ) |
dist += delta; |
else if ( delta < 54 ) |
dist += 54; |
else |
dist += delta; |
} |
} |
else |
{ |
/* strong hinting process: snap the stem width to integer pixels */ |
|
dist = af_cjk_snap_width( axis->widths, axis->width_count, dist ); |
|
if ( vertical ) |
{ |
/* in the case of vertical hinting, always round */ |
/* the stem heights to integer pixels */ |
|
if ( dist >= 64 ) |
dist = ( dist + 16 ) & ~63; |
else |
dist = 64; |
} |
else |
{ |
if ( AF_LATIN_HINTS_DO_MONO( hints ) ) |
{ |
/* monochrome horizontal hinting: snap widths to integer pixels */ |
/* with a different threshold */ |
|
if ( dist < 64 ) |
dist = 64; |
else |
dist = ( dist + 32 ) & ~63; |
} |
else |
{ |
/* for horizontal anti-aliased hinting, we adopt a more subtle */ |
/* approach: we strengthen small stems, round stems whose size */ |
/* is between 1 and 2 pixels to an integer, otherwise nothing */ |
|
if ( dist < 48 ) |
dist = ( dist + 64 ) >> 1; |
|
else if ( dist < 128 ) |
dist = ( dist + 22 ) & ~63; |
else |
/* round otherwise to prevent color fringes in LCD mode */ |
dist = ( dist + 32 ) & ~63; |
} |
} |
} |
|
Done_Width: |
if ( sign ) |
dist = -dist; |
|
return dist; |
} |
|
|
/* align one stem edge relative to the previous stem edge */ |
|
static void |
af_cjk_align_linked_edge( AF_GlyphHints hints, |
AF_Dimension dim, |
AF_Edge base_edge, |
AF_Edge stem_edge ) |
{ |
FT_Pos dist = stem_edge->opos - base_edge->opos; |
|
FT_Pos fitted_width = af_cjk_compute_stem_width( |
hints, dim, dist, |
(AF_Edge_Flags)base_edge->flags, |
(AF_Edge_Flags)stem_edge->flags ); |
|
|
stem_edge->pos = base_edge->pos + fitted_width; |
} |
|
|
static void |
af_cjk_align_serif_edge( AF_GlyphHints hints, |
AF_Edge base, |
AF_Edge serif ) |
{ |
FT_UNUSED( hints ); |
|
serif->pos = base->pos + ( serif->opos - base->opos ); |
} |
|
|
/*************************************************************************/ |
/*************************************************************************/ |
/*************************************************************************/ |
/**** ****/ |
/**** E D G E H I N T I N G ****/ |
/**** ****/ |
/*************************************************************************/ |
/*************************************************************************/ |
/*************************************************************************/ |
|
|
#define AF_LIGHT_MODE_MAX_HORZ_GAP 9 |
#define AF_LIGHT_MODE_MAX_VERT_GAP 15 |
#define AF_LIGHT_MODE_MAX_DELTA_ABS 14 |
|
|
static FT_Pos |
af_hint_normal_stem( AF_GlyphHints hints, |
AF_Edge edge, |
AF_Edge edge2, |
FT_Pos anchor, |
AF_Dimension dim ) |
{ |
FT_Pos org_len, cur_len, org_center; |
FT_Pos cur_pos1, cur_pos2; |
FT_Pos d_off1, u_off1, d_off2, u_off2, delta; |
FT_Pos offset; |
FT_Pos threshold = 64; |
|
|
if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ) |
{ |
if ( ( edge->flags & AF_EDGE_ROUND ) && |
( edge2->flags & AF_EDGE_ROUND ) ) |
{ |
if ( dim == AF_DIMENSION_VERT ) |
threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP; |
else |
threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP; |
} |
else |
{ |
if ( dim == AF_DIMENSION_VERT ) |
threshold = 64 - AF_LIGHT_MODE_MAX_HORZ_GAP / 3; |
else |
threshold = 64 - AF_LIGHT_MODE_MAX_VERT_GAP / 3; |
} |
} |
|
org_len = edge2->opos - edge->opos; |
cur_len = af_cjk_compute_stem_width( hints, dim, org_len, |
(AF_Edge_Flags)edge->flags, |
(AF_Edge_Flags)edge2->flags ); |
|
org_center = ( edge->opos + edge2->opos ) / 2 + anchor; |
cur_pos1 = org_center - cur_len / 2; |
cur_pos2 = cur_pos1 + cur_len; |
d_off1 = cur_pos1 - FT_PIX_FLOOR( cur_pos1 ); |
d_off2 = cur_pos2 - FT_PIX_FLOOR( cur_pos2 ); |
u_off1 = 64 - d_off1; |
u_off2 = 64 - d_off2; |
delta = 0; |
|
|
if ( d_off1 == 0 || d_off2 == 0 ) |
goto Exit; |
|
if ( cur_len <= threshold ) |
{ |
if ( d_off2 < cur_len ) |
{ |
if ( u_off1 <= d_off2 ) |
delta = u_off1; |
else |
delta = -d_off2; |
} |
|
goto Exit; |
} |
|
if ( threshold < 64 ) |
{ |
if ( d_off1 >= threshold || u_off1 >= threshold || |
d_off2 >= threshold || u_off2 >= threshold ) |
goto Exit; |
} |
|
offset = cur_len & 63; |
|
if ( offset < 32 ) |
{ |
if ( u_off1 <= offset || d_off2 <= offset ) |
goto Exit; |
} |
else |
offset = 64 - threshold; |
|
d_off1 = threshold - u_off1; |
u_off1 = u_off1 - offset; |
u_off2 = threshold - d_off2; |
d_off2 = d_off2 - offset; |
|
if ( d_off1 <= u_off1 ) |
u_off1 = -d_off1; |
|
if ( d_off2 <= u_off2 ) |
u_off2 = -d_off2; |
|
if ( FT_ABS( u_off1 ) <= FT_ABS( u_off2 ) ) |
delta = u_off1; |
else |
delta = u_off2; |
|
Exit: |
|
#if 1 |
if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ) |
{ |
if ( delta > AF_LIGHT_MODE_MAX_DELTA_ABS ) |
delta = AF_LIGHT_MODE_MAX_DELTA_ABS; |
else if ( delta < -AF_LIGHT_MODE_MAX_DELTA_ABS ) |
delta = -AF_LIGHT_MODE_MAX_DELTA_ABS; |
} |
#endif |
|
cur_pos1 += delta; |
|
if ( edge->opos < edge2->opos ) |
{ |
edge->pos = cur_pos1; |
edge2->pos = cur_pos1 + cur_len; |
} |
else |
{ |
edge->pos = cur_pos1 + cur_len; |
edge2->pos = cur_pos1; |
} |
|
return delta; |
} |
|
|
static void |
af_cjk_hint_edges( AF_GlyphHints hints, |
AF_Dimension dim ) |
{ |
AF_AxisHints axis = &hints->axis[dim]; |
AF_Edge edges = axis->edges; |
AF_Edge edge_limit = edges + axis->num_edges; |
FT_PtrDist n_edges; |
AF_Edge edge; |
AF_Edge anchor = 0; |
FT_Pos delta = 0; |
FT_Int skipped = 0; |
FT_Bool has_last_stem = FALSE; |
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++ ) |
{ |
AF_Edge edge2; |
|
|
if ( edge->flags & AF_EDGE_DONE ) |
continue; |
|
/* skip all non-stem edges */ |
edge2 = edge->link; |
if ( !edge2 ) |
{ |
skipped++; |
continue; |
} |
|
/* Some CJK characters have so many stems that |
* the hinter is likely to merge two adjacent ones. |
* To solve this problem, if either edge of a stem |
* is too close to the previous one, we avoid |
* aligning the two edges, but rather interpolate |
* their locations at the end of this function in |
* order to preserve the space between the stems. |
*/ |
if ( has_last_stem && |
( edge->pos < last_stem_pos + 64 || |
edge2->pos < last_stem_pos + 64 ) ) |
{ |
skipped++; |
continue; |
} |
|
/* 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 ) |
{ |
af_cjk_align_linked_edge( hints, dim, edge2, edge ); |
edge->flags |= AF_EDGE_DONE; |
/* We rarely reaches here it seems; |
* usually the two edges belonging |
* to one stem are marked as DONE together |
*/ |
has_last_stem = TRUE; |
last_stem_pos = edge->pos; |
continue; |
} |
|
if ( dim != AF_DIMENSION_VERT && !anchor ) |
{ |
|
#if 0 |
if ( fixedpitch ) |
{ |
AF_Edge left = edge; |
AF_Edge right = edge_limit - 1; |
AF_EdgeRec left1, left2, right1, right2; |
FT_Pos target, center1, center2; |
FT_Pos delta1, delta2, d1, d2; |
|
|
while ( right > left && !right->link ) |
right--; |
|
left1 = *left; |
left2 = *left->link; |
right1 = *right->link; |
right2 = *right; |
|
delta = ( ( ( hinter->pp2.x + 32 ) & -64 ) - hinter->pp2.x ) / 2; |
target = left->opos + ( right->opos - left->opos ) / 2 + delta - 16; |
|
delta1 = delta; |
delta1 += af_hint_normal_stem( hints, left, left->link, |
delta1, 0 ); |
|
if ( left->link != right ) |
af_hint_normal_stem( hints, right->link, right, delta1, 0 ); |
|
center1 = left->pos + ( right->pos - left->pos ) / 2; |
|
if ( center1 >= target ) |
delta2 = delta - 32; |
else |
delta2 = delta + 32; |
|
delta2 += af_hint_normal_stem( hints, &left1, &left2, delta2, 0 ); |
|
if ( delta1 != delta2 ) |
{ |
if ( left->link != right ) |
af_hint_normal_stem( hints, &right1, &right2, delta2, 0 ); |
|
center2 = left1.pos + ( right2.pos - left1.pos ) / 2; |
|
d1 = center1 - target; |
d2 = center2 - target; |
|
if ( FT_ABS( d2 ) < FT_ABS( d1 ) ) |
{ |
left->pos = left1.pos; |
left->link->pos = left2.pos; |
|
if ( left->link != right ) |
{ |
right->link->pos = right1.pos; |
right->pos = right2.pos; |
} |
|
delta1 = delta2; |
} |
} |
|
delta = delta1; |
right->link->flags |= AF_EDGE_DONE; |
right->flags |= AF_EDGE_DONE; |
} |
else |
|
#endif /* 0 */ |
|
delta = af_hint_normal_stem( hints, edge, edge2, 0, |
AF_DIMENSION_HORZ ); |
} |
else |
af_hint_normal_stem( hints, edge, edge2, delta, dim ); |
|
#if 0 |
printf( "stem (%d,%d) adjusted (%.1f,%.1f)\n", |
edge - edges, edge2 - edges, |
( edge->pos - edge->opos ) / 64.0, |
( edge2->pos - edge2->opos ) / 64.0 ); |
#endif |
|
anchor = edge; |
edge->flags |= AF_EDGE_DONE; |
edge2->flags |= AF_EDGE_DONE; |
has_last_stem = TRUE; |
last_stem_pos = edge2->pos; |
} |
|
/* 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 with serifs. 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. */ |
|
/* We don't handle horizontal edges since we can't easily assure that */ |
/* the third (lowest) stem aligns with the base line; it might end up */ |
/* one pixel higher or lower. */ |
|
n_edges = edge_limit - edges; |
if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) ) |
{ |
AF_Edge edge1, edge2, edge3; |
FT_Pos dist1, dist2, span; |
|
|
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 ( edge1->link == edge1 + 1 && |
edge2->link == edge2 + 1 && |
edge3->link == edge3 + 1 && 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 |= AF_EDGE_DONE; |
if ( edge3->link ) |
edge3->link->flags |= AF_EDGE_DONE; |
} |
} |
|
if ( !skipped ) |
return; |
|
/* |
* now hint the remaining edges (serifs and single) in order |
* to complete our processing |
*/ |
for ( edge = edges; edge < edge_limit; edge++ ) |
{ |
if ( edge->flags & AF_EDGE_DONE ) |
continue; |
|
if ( edge->serif ) |
{ |
af_cjk_align_serif_edge( hints, edge->serif, edge ); |
edge->flags |= AF_EDGE_DONE; |
skipped--; |
} |
} |
|
if ( !skipped ) |
return; |
|
for ( edge = edges; edge < edge_limit; edge++ ) |
{ |
AF_Edge before, after; |
|
|
if ( edge->flags & AF_EDGE_DONE ) |
continue; |
|
before = after = edge; |
|
while ( --before >= edges ) |
if ( before->flags & AF_EDGE_DONE ) |
break; |
|
while ( ++after < edge_limit ) |
if ( after->flags & AF_EDGE_DONE ) |
break; |
|
if ( before >= edges || after < edge_limit ) |
{ |
if ( before < edges ) |
af_cjk_align_serif_edge( hints, after, edge ); |
else if ( after >= edge_limit ) |
af_cjk_align_serif_edge( hints, before, edge ); |
else |
{ |
if ( after->fpos == before->fpos ) |
edge->pos = before->pos; |
else |
edge->pos = before->pos + |
FT_MulDiv( edge->fpos - before->fpos, |
after->pos - before->pos, |
after->fpos - before->fpos ); |
} |
} |
} |
} |
|
|
static void |
af_cjk_align_edge_points( AF_GlyphHints hints, |
AF_Dimension dim ) |
{ |
AF_AxisHints axis = & hints->axis[dim]; |
AF_Edge edges = axis->edges; |
AF_Edge edge_limit = edges + axis->num_edges; |
AF_Edge edge; |
FT_Bool snapping; |
|
|
snapping = FT_BOOL( ( dim == AF_DIMENSION_HORZ && |
AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) || |
( dim == AF_DIMENSION_VERT && |
AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ); |
|
for ( edge = edges; edge < edge_limit; edge++ ) |
{ |
/* move the points of each segment */ |
/* in each edge to the edge's position */ |
AF_Segment seg = edge->first; |
|
|
if ( snapping ) |
{ |
do |
{ |
AF_Point point = seg->first; |
|
|
for (;;) |
{ |
if ( dim == AF_DIMENSION_HORZ ) |
{ |
point->x = edge->pos; |
point->flags |= AF_FLAG_TOUCH_X; |
} |
else |
{ |
point->y = edge->pos; |
point->flags |= AF_FLAG_TOUCH_Y; |
} |
|
if ( point == seg->last ) |
break; |
|
point = point->next; |
} |
|
seg = seg->edge_next; |
|
} while ( seg != edge->first ); |
} |
else |
{ |
FT_Pos delta = edge->pos - edge->opos; |
|
|
do |
{ |
AF_Point point = seg->first; |
|
|
for (;;) |
{ |
if ( dim == AF_DIMENSION_HORZ ) |
{ |
point->x += delta; |
point->flags |= AF_FLAG_TOUCH_X; |
} |
else |
{ |
point->y += delta; |
point->flags |= AF_FLAG_TOUCH_Y; |
} |
|
if ( point == seg->last ) |
break; |
|
point = point->next; |
} |
|
seg = seg->edge_next; |
|
} while ( seg != edge->first ); |
} |
} |
} |
|
|
FT_LOCAL_DEF( FT_Error ) |
af_cjk_hints_apply( AF_GlyphHints hints, |
FT_Outline* outline, |
AF_CJKMetrics metrics ) |
{ |
FT_Error error; |
int dim; |
|
FT_UNUSED( metrics ); |
|
|
error = af_glyph_hints_reload( hints, outline ); |
if ( error ) |
goto Exit; |
|
/* analyze glyph outline */ |
if ( AF_HINTS_DO_HORIZONTAL( hints ) ) |
{ |
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 ) ) |
{ |
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 */ |
for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) |
{ |
if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) || |
( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) ) |
{ |
|
#ifdef AF_CONFIG_OPTION_USE_WARPER |
if ( dim == AF_DIMENSION_HORZ && |
metrics->root.scaler.render_mode == FT_RENDER_MODE_NORMAL ) |
{ |
AF_WarperRec warper; |
FT_Fixed scale; |
FT_Pos delta; |
|
|
af_warper_compute( &warper, hints, (AF_Dimension)dim, |
&scale, &delta ); |
af_glyph_hints_scale_dim( hints, (AF_Dimension)dim, |
scale, delta ); |
continue; |
} |
#endif /* AF_CONFIG_OPTION_USE_WARPER */ |
|
af_cjk_hint_edges( hints, (AF_Dimension)dim ); |
af_cjk_align_edge_points( hints, (AF_Dimension)dim ); |
af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim ); |
af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim ); |
} |
} |
|
#if 0 |
af_glyph_hints_dump_points( hints ); |
af_glyph_hints_dump_segments( hints ); |
af_glyph_hints_dump_edges( hints ); |
#endif |
|
af_glyph_hints_save( hints, outline ); |
|
Exit: |
return error; |
} |
|
|
/*************************************************************************/ |
/*************************************************************************/ |
/***** *****/ |
/***** C J K S C R I P T C L A S S *****/ |
/***** *****/ |
/*************************************************************************/ |
/*************************************************************************/ |
|
|
/* this corresponds to Unicode 6.0 */ |
|
static const AF_Script_UniRangeRec af_cjk_uniranges[] = |
{ |
AF_UNIRANGE_REC( 0x1100UL, 0x11FFUL ), /* Hangul Jamo */ |
AF_UNIRANGE_REC( 0x2E80UL, 0x2EFFUL ), /* CJK Radicals Supplement */ |
AF_UNIRANGE_REC( 0x2F00UL, 0x2FDFUL ), /* Kangxi Radicals */ |
AF_UNIRANGE_REC( 0x2FF0UL, 0x2FFFUL ), /* Ideographic Description Characters */ |
AF_UNIRANGE_REC( 0x3000UL, 0x303FUL ), /* CJK Symbols and Punctuation */ |
AF_UNIRANGE_REC( 0x3040UL, 0x309FUL ), /* Hiragana */ |
AF_UNIRANGE_REC( 0x30A0UL, 0x30FFUL ), /* Katakana */ |
AF_UNIRANGE_REC( 0x3100UL, 0x312FUL ), /* Bopomofo */ |
AF_UNIRANGE_REC( 0x3130UL, 0x318FUL ), /* Hangul Compatibility Jamo */ |
AF_UNIRANGE_REC( 0x3190UL, 0x319FUL ), /* Kanbun */ |
AF_UNIRANGE_REC( 0x31A0UL, 0x31BFUL ), /* Bopomofo Extended */ |
AF_UNIRANGE_REC( 0x31C0UL, 0x31EFUL ), /* CJK Strokes */ |
AF_UNIRANGE_REC( 0x31F0UL, 0x31FFUL ), /* Katakana Phonetic Extensions */ |
AF_UNIRANGE_REC( 0x3200UL, 0x32FFUL ), /* Enclosed CJK Letters and Months */ |
AF_UNIRANGE_REC( 0x3300UL, 0x33FFUL ), /* CJK Compatibility */ |
AF_UNIRANGE_REC( 0x3400UL, 0x4DBFUL ), /* CJK Unified Ideographs Extension A */ |
AF_UNIRANGE_REC( 0x4DC0UL, 0x4DFFUL ), /* Yijing Hexagram Symbols */ |
AF_UNIRANGE_REC( 0x4E00UL, 0x9FFFUL ), /* CJK Unified Ideographs */ |
AF_UNIRANGE_REC( 0xA960UL, 0xA97FUL ), /* Hangul Jamo Extended-A */ |
AF_UNIRANGE_REC( 0xAC00UL, 0xD7AFUL ), /* Hangul Syllables */ |
AF_UNIRANGE_REC( 0xD7B0UL, 0xD7FFUL ), /* Hangul Jamo Extended-B */ |
AF_UNIRANGE_REC( 0xF900UL, 0xFAFFUL ), /* CJK Compatibility Ideographs */ |
AF_UNIRANGE_REC( 0xFE10UL, 0xFE1FUL ), /* Vertical forms */ |
AF_UNIRANGE_REC( 0xFE30UL, 0xFE4FUL ), /* CJK Compatibility Forms */ |
AF_UNIRANGE_REC( 0xFF00UL, 0xFFEFUL ), /* Halfwidth and Fullwidth Forms */ |
AF_UNIRANGE_REC( 0x1B000UL, 0x1B0FFUL ), /* Kana Supplement */ |
AF_UNIRANGE_REC( 0x1D300UL, 0x1D35FUL ), /* Tai Xuan Hing Symbols */ |
AF_UNIRANGE_REC( 0x1F200UL, 0x1F2FFUL ), /* Enclosed Ideographic Supplement */ |
AF_UNIRANGE_REC( 0x20000UL, 0x2A6DFUL ), /* CJK Unified Ideographs Extension B */ |
AF_UNIRANGE_REC( 0x2A700UL, 0x2B73FUL ), /* CJK Unified Ideographs Extension C */ |
AF_UNIRANGE_REC( 0x2B740UL, 0x2B81FUL ), /* CJK Unified Ideographs Extension D */ |
AF_UNIRANGE_REC( 0x2F800UL, 0x2FA1FUL ), /* CJK Compatibility Ideographs Supplement */ |
AF_UNIRANGE_REC( 0UL, 0UL ) |
}; |
|
|
AF_DEFINE_SCRIPT_CLASS( af_cjk_script_class, |
AF_SCRIPT_CJK, |
af_cjk_uniranges, |
0x7530, /* 田 */ |
|
sizeof ( AF_CJKMetricsRec ), |
|
(AF_Script_InitMetricsFunc) af_cjk_metrics_init, |
(AF_Script_ScaleMetricsFunc)af_cjk_metrics_scale, |
(AF_Script_DoneMetricsFunc) NULL, |
|
(AF_Script_InitHintsFunc) af_cjk_hints_init, |
(AF_Script_ApplyHintsFunc) af_cjk_hints_apply |
) |
|
#else /* !AF_CONFIG_OPTION_CJK */ |
|
static const AF_Script_UniRangeRec af_cjk_uniranges[] = |
{ |
AF_UNIRANGE_REC( 0UL, 0UL ) |
}; |
|
|
AF_DEFINE_SCRIPT_CLASS( af_cjk_script_class, |
AF_SCRIPT_CJK, |
af_cjk_uniranges, |
0, |
|
sizeof ( AF_CJKMetricsRec ), |
|
(AF_Script_InitMetricsFunc) NULL, |
(AF_Script_ScaleMetricsFunc)NULL, |
(AF_Script_DoneMetricsFunc) NULL, |
|
(AF_Script_InitHintsFunc) NULL, |
(AF_Script_ApplyHintsFunc) NULL |
) |
|
#endif /* !AF_CONFIG_OPTION_CJK */ |
|
|
/* END */ |