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authorDenis Bitouzé <dbitouze@wanadoo.fr>2021-02-25 18:23:07 +0000
committerDenis Bitouzé <dbitouze@wanadoo.fr>2021-02-25 18:23:07 +0000
commitc6101f91d071883b48b1b4b51e5eba0f36d9a78d (patch)
tree1bf7f5a881d7a4f5c5bf59d0b2821943dd822372 /Build/source/libs/freetype2/freetype-src/src/autofit/afcjk.c
parent07ee7222e389b0777456b427a55c22d0e6ffd267 (diff)
French translation for tlmgr updated
git-svn-id: svn://tug.org/texlive/trunk@57912 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Build/source/libs/freetype2/freetype-src/src/autofit/afcjk.c')
-rw-r--r--Build/source/libs/freetype2/freetype-src/src/autofit/afcjk.c2407
1 files changed, 0 insertions, 2407 deletions
diff --git a/Build/source/libs/freetype2/freetype-src/src/autofit/afcjk.c b/Build/source/libs/freetype2/freetype-src/src/autofit/afcjk.c
deleted file mode 100644
index 3b340cd5eda..00000000000
--- a/Build/source/libs/freetype2/freetype-src/src/autofit/afcjk.c
+++ /dev/null
@@ -1,2407 +0,0 @@
-/****************************************************************************
- *
- * afcjk.c
- *
- * Auto-fitter hinting routines for CJK writing system (body).
- *
- * Copyright (C) 2006-2020 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, archived at
- *
- * https://web.archive.org/web/20051219160454/http://www.kde.gr.jp:80/~akito/patch/freetype2/2.1.7/
- *
- */
-
-#include <freetype/ftadvanc.h>
-#include <freetype/internal/ftdebug.h>
-
-#include "afglobal.h"
-#include "aflatin.h"
-#include "afcjk.h"
-
-
-#ifdef AF_CONFIG_OPTION_CJK
-
-#undef AF_CONFIG_OPTION_CJK_BLUE_HANI_VERT
-
-#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 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];
-
-
- FT_TRACE5(( "\n"
- "cjk standard widths computation (style `%s')\n"
- "===================================================\n"
- "\n",
- af_style_names[metrics->root.style_class->style] ));
-
- 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_ULong glyph_index;
- int dim;
- AF_CJKMetricsRec dummy[1];
- AF_Scaler scaler = &dummy->root.scaler;
-
- AF_StyleClass style_class = metrics->root.style_class;
- AF_ScriptClass script_class = af_script_classes[style_class->script];
-
- /* If HarfBuzz is not available, we need a pointer to a single */
- /* unsigned long value. */
-#ifdef FT_CONFIG_OPTION_USE_HARFBUZZ
- void* shaper_buf;
-#else
- FT_ULong shaper_buf_;
- void* shaper_buf = &shaper_buf_;
-#endif
-
- const char* p;
-
-#ifdef FT_DEBUG_LEVEL_TRACE
- FT_ULong ch = 0;
-#endif
-
- p = script_class->standard_charstring;
-
-#ifdef FT_CONFIG_OPTION_USE_HARFBUZZ
- shaper_buf = af_shaper_buf_create( face );
-#endif
-
- /* We check a list of standard characters. The first match wins. */
-
- glyph_index = 0;
- while ( *p )
- {
- unsigned int num_idx;
-
-#ifdef FT_DEBUG_LEVEL_TRACE
- const char* p_old;
-#endif
-
-
- while ( *p == ' ' )
- p++;
-
-#ifdef FT_DEBUG_LEVEL_TRACE
- p_old = p;
- GET_UTF8_CHAR( ch, p_old );
-#endif
-
- /* reject input that maps to more than a single glyph */
- p = af_shaper_get_cluster( p, &metrics->root, shaper_buf, &num_idx );
- if ( num_idx > 1 )
- continue;
-
- /* otherwise exit loop if we have a result */
- glyph_index = af_shaper_get_elem( &metrics->root,
- shaper_buf,
- 0,
- NULL,
- NULL );
- if ( glyph_index )
- break;
- }
-
- af_shaper_buf_destroy( face, shaper_buf );
-
- if ( !glyph_index )
- goto Exit;
-
- if ( !glyph_index )
- goto Exit;
-
- FT_TRACE5(( "standard character: U+%04lX (glyph index %ld)\n",
- ch, glyph_index ));
-
- 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_StyleMetrics)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;
-
- /*
- * We assume that the glyphs selected for the stem width
- * computation are `featureless' enough so that the linking
- * algorithm works fine without adjustments of its scoring
- * function.
- */
- af_latin_hints_link_segments( hints,
- 0,
- NULL,
- (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;
-
-#ifdef FT_DEBUG_LEVEL_TRACE
- {
- FT_UInt i;
-
-
- FT_TRACE5(( "%s widths:\n",
- dim == AF_DIMENSION_VERT ? "horizontal"
- : "vertical" ));
-
- FT_TRACE5(( " %ld (standard)", axis->standard_width ));
- for ( i = 1; i < axis->width_count; i++ )
- FT_TRACE5(( " %ld", axis->widths[i].org ));
-
- FT_TRACE5(( "\n" ));
- }
-#endif
- }
- }
-
- FT_TRACE5(( "\n" ));
-
- af_glyph_hints_done( hints );
- }
-
-
- /* Find all blue zones. */
-
- static void
- af_cjk_metrics_init_blues( AF_CJKMetrics metrics,
- FT_Face face )
- {
- FT_Pos fills[AF_BLUE_STRING_MAX_LEN];
- FT_Pos flats[AF_BLUE_STRING_MAX_LEN];
-
- FT_UInt num_fills;
- FT_UInt num_flats;
-
- FT_Bool fill;
-
- AF_CJKBlue blue;
- FT_Error error;
- AF_CJKAxis axis;
- FT_Outline outline;
-
- AF_StyleClass sc = metrics->root.style_class;
-
- AF_Blue_Stringset bss = sc->blue_stringset;
- const AF_Blue_StringRec* bs = &af_blue_stringsets[bss];
-
- /* If HarfBuzz is not available, we need a pointer to a single */
- /* unsigned long value. */
-#ifdef FT_CONFIG_OPTION_USE_HARFBUZZ
- void* shaper_buf;
-#else
- FT_ULong shaper_buf_;
- void* shaper_buf = &shaper_buf_;
-#endif
-
-
- /* we walk over the blue character strings as specified in the */
- /* style's entry in the `af_blue_stringset' array, computing its */
- /* extremum points (depending on the string properties) */
-
- FT_TRACE5(( "cjk blue zones computation\n"
- "==========================\n"
- "\n" ));
-
-#ifdef FT_CONFIG_OPTION_USE_HARFBUZZ
- shaper_buf = af_shaper_buf_create( face );
-#endif
-
- for ( ; bs->string != AF_BLUE_STRING_MAX; bs++ )
- {
- const char* p = &af_blue_strings[bs->string];
- FT_Pos* blue_ref;
- FT_Pos* blue_shoot;
-
-
- if ( AF_CJK_IS_HORIZ_BLUE( bs ) )
- axis = &metrics->axis[AF_DIMENSION_HORZ];
- else
- axis = &metrics->axis[AF_DIMENSION_VERT];
-
-#ifdef FT_DEBUG_LEVEL_TRACE
- {
- FT_String* cjk_blue_name[4] =
- {
- (FT_String*)"bottom", /* -- , -- */
- (FT_String*)"top", /* -- , TOP */
- (FT_String*)"left", /* HORIZ, -- */
- (FT_String*)"right" /* HORIZ, TOP */
- };
-
-
- FT_TRACE5(( "blue zone %d (%s):\n",
- axis->blue_count,
- cjk_blue_name[AF_CJK_IS_HORIZ_BLUE( bs ) |
- AF_CJK_IS_TOP_BLUE( bs ) ] ));
- }
-#endif /* FT_DEBUG_LEVEL_TRACE */
-
- num_fills = 0;
- num_flats = 0;
-
- fill = 1; /* start with characters that define fill values */
- FT_TRACE5(( " [overshoot values]\n" ));
-
- while ( *p )
- {
- FT_ULong glyph_index;
- FT_Pos best_pos; /* same as points.y or points.x, resp. */
- FT_Int best_point;
- FT_Vector* points;
-
- unsigned int num_idx;
-
-#ifdef FT_DEBUG_LEVEL_TRACE
- const char* p_old;
- FT_ULong ch;
-#endif
-
-
- while ( *p == ' ' )
- p++;
-
-#ifdef FT_DEBUG_LEVEL_TRACE
- p_old = p;
- GET_UTF8_CHAR( ch, p_old );
-#endif
-
- /* switch to characters that define flat values */
- if ( *p == '|' )
- {
- fill = 0;
- FT_TRACE5(( " [reference values]\n" ));
- p++;
- continue;
- }
-
- /* reject input that maps to more than a single glyph */
- p = af_shaper_get_cluster( p, &metrics->root, shaper_buf, &num_idx );
- if ( num_idx > 1 )
- continue;
-
- /* load the character in the face -- skip unknown or empty ones */
- glyph_index = af_shaper_get_elem( &metrics->root,
- shaper_buf,
- 0,
- NULL,
- NULL );
- if ( glyph_index == 0 )
- {
- FT_TRACE5(( " U+%04lX unavailable\n", ch ));
- continue;
- }
-
- error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
- outline = face->glyph->outline;
- if ( error || outline.n_points <= 2 )
- {
- FT_TRACE5(( " U+%04lX contains no (usable) outlines\n", ch ));
- continue;
- }
-
- /* now compute min or max point indices and coordinates */
- points = 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 < outline.n_contours; first = last + 1, nn++ )
- {
- FT_Int pp;
-
-
- last = 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;
-
- if ( AF_CJK_IS_HORIZ_BLUE( bs ) )
- {
- if ( AF_CJK_IS_RIGHT_BLUE( bs ) )
- {
- for ( pp = first; pp <= last; pp++ )
- if ( best_point < 0 || points[pp].x > best_pos )
- {
- best_point = pp;
- best_pos = points[pp].x;
- }
- }
- else
- {
- for ( pp = first; pp <= last; pp++ )
- if ( best_point < 0 || points[pp].x < best_pos )
- {
- best_point = pp;
- best_pos = points[pp].x;
- }
- }
- }
- else
- {
- if ( AF_CJK_IS_TOP_BLUE( bs ) )
- {
- for ( pp = first; pp <= last; pp++ )
- if ( best_point < 0 || points[pp].y > best_pos )
- {
- best_point = pp;
- best_pos = points[pp].y;
- }
- }
- else
- {
- for ( pp = first; pp <= last; pp++ )
- if ( best_point < 0 || points[pp].y < best_pos )
- {
- best_point = pp;
- best_pos = points[pp].y;
- }
- }
- }
- }
-
- FT_TRACE5(( " U+%04lX: best_pos = %5ld\n", ch, best_pos ));
- }
-
- if ( fill )
- fills[num_fills++] = best_pos;
- else
- flats[num_flats++] = best_pos;
-
- } /* end while loop */
-
- 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 and overshoot position of the blue -- */
- /* we simply take the median value after a simple sort */
- af_sort_pos( num_fills, fills );
- af_sort_pos( num_flats, flats );
-
- 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 =
- *blue_shoot = fills[num_fills / 2];
- }
- else if ( num_fills == 0 )
- {
- *blue_ref =
- *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 );
-
-
- /* AF_CJK_IS_TOP_BLUE covers `right' and `top' */
- if ( AF_CJK_IS_TOP_BLUE( bs ) ^ under_ref )
- {
- *blue_ref =
- *blue_shoot = ( shoot + ref ) / 2;
-
- FT_TRACE5(( " [reference smaller than overshoot,"
- " taking mean value]\n" ));
- }
- }
-
- blue->flags = 0;
- if ( AF_CJK_IS_TOP_BLUE( bs ) )
- blue->flags |= AF_CJK_BLUE_TOP;
-
- FT_TRACE5(( " -> reference = %ld\n"
- " overshoot = %ld\n",
- *blue_ref, *blue_shoot ));
-
- } /* end for loop */
-
- af_shaper_buf_destroy( face, shaper_buf );
-
- FT_TRACE5(( "\n" ));
-
- 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_Bool started = 0, same_width = 1;
- FT_Fixed advance = 0, old_advance = 0;
-
- /* If HarfBuzz is not available, we need a pointer to a single */
- /* unsigned long value. */
-#ifdef FT_CONFIG_OPTION_USE_HARFBUZZ
- void* shaper_buf;
-#else
- FT_ULong shaper_buf_;
- void* shaper_buf = &shaper_buf_;
-#endif
-
- /* in all supported charmaps, digits have character codes 0x30-0x39 */
- const char digits[] = "0 1 2 3 4 5 6 7 8 9";
- const char* p;
-
-
- p = digits;
-
-#ifdef FT_CONFIG_OPTION_USE_HARFBUZZ
- shaper_buf = af_shaper_buf_create( face );
-#endif
-
- while ( *p )
- {
- FT_ULong glyph_index;
- unsigned int num_idx;
-
-
- /* reject input that maps to more than a single glyph */
- p = af_shaper_get_cluster( p, &metrics->root, shaper_buf, &num_idx );
- if ( num_idx > 1 )
- continue;
-
- glyph_index = af_shaper_get_elem( &metrics->root,
- shaper_buf,
- 0,
- &advance,
- NULL );
- if ( !glyph_index )
- continue;
-
- if ( started )
- {
- if ( advance != old_advance )
- {
- same_width = 0;
- break;
- }
- }
- else
- {
- old_advance = advance;
- started = 1;
- }
- }
-
- af_shaper_buf_destroy( face, shaper_buf );
-
- metrics->root.digits_have_same_width = same_width;
- }
-
-
- /* Initialize global metrics. */
-
- 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 ) )
- {
- af_cjk_metrics_init_widths( metrics, face );
- af_cjk_metrics_init_blues( metrics, face );
- af_cjk_metrics_check_digits( metrics, face );
- }
-
- FT_Set_Charmap( face, oldmap );
- return FT_Err_Ok;
- }
-
-
- /* Adjust scaling value, then scale and shift widths */
- /* and blue zones (if applicable) for given dimension. */
-
- 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;
-
-
- if ( dim == AF_DIMENSION_HORZ )
- {
- scale = scaler->x_scale;
- delta = scaler->x_delta;
- }
- else
- {
- scale = scaler->y_scale;
- delta = scaler->y_delta;
- }
-
- axis = &metrics->axis[dim];
-
- 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: %ld", 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(( "/%ld\n", delta2 ));
-
- if ( delta1 < 0 )
- delta2 = -delta2;
-
- blue->shoot.fit = blue->ref.fit - delta2;
-
- FT_TRACE5(( ">> active cjk blue zone %c%d[%ld/%ld]:\n"
- " ref: cur=%.2f fit=%.2f\n"
- " 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;
- }
- }
- }
-
-
- /* Scale global values in both directions. */
-
- FT_LOCAL_DEF( void )
- af_cjk_metrics_scale( AF_CJKMetrics metrics,
- AF_Scaler scaler )
- {
- /* we copy the whole structure since the x and y scaling values */
- /* are not modified, contrary to e.g. the `latin' auto-hinter */
- metrics->root.scaler = *scaler;
-
- af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ );
- af_cjk_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT );
- }
-
-
- /* Extract standard_width from writing system/script specific */
- /* metrics class. */
-
- FT_LOCAL_DEF( void )
- af_cjk_get_standard_widths( AF_CJKMetrics metrics,
- FT_Pos* stdHW,
- FT_Pos* stdVW )
- {
- if ( stdHW )
- *stdHW = metrics->axis[AF_DIMENSION_VERT].standard_width;
-
- if ( stdVW )
- *stdVW = metrics->axis[AF_DIMENSION_HORZ].standard_width;
- }
-
-
- /*************************************************************************/
- /*************************************************************************/
- /***** *****/
- /***** C J K G L Y P H A N A L Y S I S *****/
- /***** *****/
- /*************************************************************************/
- /*************************************************************************/
-
-
- /* Walk over all contours and compute its segments. */
-
- 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 = FT_OFFSET( 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;
- FT_UInt f0 = pt->flags & AF_FLAG_CONTROL;
- FT_UInt f1;
-
-
- seg->flags &= ~AF_EDGE_ROUND;
-
- for ( ; pt != last; f0 = f1 )
- {
- pt = pt->next;
- f1 = 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++ )
- {
- 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 = NULL;
- seg->serif = link1;
- }
- else if ( link == link2 )
- {
- seg->link = NULL;
- seg->serif = seg1;
- }
- }
- }
- else
- {
- seg1->link = link1->link = NULL;
-
- break;
- }
- }
- }
- }
-
- for ( seg1 = segments; seg1 < segment_limit; seg1++ )
- {
- seg2 = seg1->link;
-
- if ( seg2 )
- {
- if ( seg2->link != seg1 )
- {
- seg1->link = NULL;
-
- if ( seg2->score < dist_threshold || seg1->score < seg2->score * 4 )
- seg1->serif = seg2->link;
- }
- }
- }
- }
-
-
- 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 = NULL;
- 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, 0,
- 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->dir = seg->dir;
- edge->fpos = seg->pos;
- edge->opos = FT_MulFix( seg->pos, scale );
- edge->pos = edge->opos;
- seg->edge_next = seg;
- }
- 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 the
- * segments found on its position. Basically, these are
- *
- * - the 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;
- if ( !seg )
- goto Skip_Loop;
-
- 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 );
-
- Skip_Loop:
- /* 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 = NULL;
- }
- }
-
- Exit:
- return error;
- }
-
-
- /* Detect segments and edges for given dimension. */
-
- 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;
- }
-
-
- /* Compute all edges which lie within blue zones. */
-
- static 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_Byte)( ( blue->flags & AF_CJK_BLUE_TOP ) != 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;
- }
- }
-
-
- /* Initalize hinting engine. */
-
- 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_StyleMetrics)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;
-
-#if 0 /* 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 unless in `light' or `lcd' mode.
- */
- if ( mode != FT_RENDER_MODE_LIGHT && mode != FT_RENDER_MODE_LCD )
- 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;
-
-#ifdef AF_CONFIG_OPTION_USE_WARPER
- /* get (global) warper flag */
- if ( !metrics->root.globals->module->warping )
- scaler_flags |= AF_SCALER_FLAG_NO_WARPER;
-#endif
-
- hints->scaler_flags = scaler_flags;
- hints->other_flags = other_flags;
-
- return FT_Err_Ok;
- }
-
-
- /*************************************************************************/
- /*************************************************************************/
- /***** *****/
- /***** 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_UInt count,
- FT_Pos width )
- {
- FT_UInt 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. */
- /* There is a lot of voodoo in this function; changing the hard-coded */
- /* parameters influence the whole hinting process. */
-
- static FT_Pos
- af_cjk_compute_stem_width( AF_GlyphHints hints,
- AF_Dimension dim,
- FT_Pos width,
- FT_UInt base_flags,
- FT_UInt 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,
- base_edge->flags,
- stem_edge->flags );
-
-
- stem_edge->pos = base_edge->pos + fitted_width;
-
- FT_TRACE5(( " CJKLINK: edge %ld @%d (opos=%.2f) linked to %.2f,"
- " dist was %.2f, now %.2f\n",
- stem_edge - hints->axis[dim].edges, stem_edge->fpos,
- stem_edge->opos / 64.0, stem_edge->pos / 64.0,
- dist / 64.0, fitted_width / 64.0 ));
- }
-
-
- /* Shift the coordinates of the `serif' edge by the same amount */
- /* as the corresponding `base' edge has been moved already. */
-
- 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,
- 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;
- }
-
-
- /* The main grid-fitting routine. */
-
- 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 = NULL;
- FT_Pos delta = 0;
- FT_Int skipped = 0;
- FT_Bool has_last_stem = FALSE;
- FT_Pos last_stem_pos = 0;
-
-#ifdef FT_DEBUG_LEVEL_TRACE
- FT_UInt num_actions = 0;
-#endif
-
-
- FT_TRACE5(( "cjk %s edge hinting (style `%s')\n",
- dim == AF_DIMENSION_VERT ? "horizontal" : "vertical",
- af_style_names[hints->metrics->style_class->style] ));
-
- /* we begin by aligning all stems relative to the blue zone */
-
- 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;
-
-#ifdef FT_DEBUG_LEVEL_TRACE
- FT_TRACE5(( " CJKBLUE: edge %ld @%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 ));
-
- num_actions++;
-#endif
-
- 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;
-
-#ifdef FT_DEBUG_LEVEL_TRACE
- num_actions++;
-#endif
- }
-
- 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 %ld\n", edge2-edges ));
-
- af_cjk_align_linked_edge( hints, dim, edge2, edge );
- edge->flags |= AF_EDGE_DONE;
-
-#ifdef FT_DEBUG_LEVEL_TRACE
- num_actions++;
-#endif
-
- continue;
- }
-
- if ( edge2 < edge )
- {
- af_cjk_align_linked_edge( hints, dim, edge2, edge );
- edge->flags |= AF_EDGE_DONE;
-
-#ifdef FT_DEBUG_LEVEL_TRACE
- num_actions++;
-#endif
-
- /* 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 )
- goto Exit;
-
- /*
- * 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 )
- goto Exit;
-
- 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 );
- }
- }
- }
-
- Exit:
-
-#ifdef FT_DEBUG_LEVEL_TRACE
- if ( !num_actions )
- FT_TRACE5(( " (none)\n" ));
- FT_TRACE5(( "\n" ));
-#endif
-
- return;
- }
-
-
- 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 );
- }
- }
- }
-
-
- /* Apply the complete hinting algorithm to a CJK glyph. */
-
- FT_LOCAL_DEF( FT_Error )
- af_cjk_hints_apply( FT_UInt glyph_index,
- AF_GlyphHints hints,
- FT_Outline* outline,
- AF_CJKMetrics metrics )
- {
- FT_Error error;
- int dim;
-
- FT_UNUSED( metrics );
- FT_UNUSED( glyph_index );
-
-
- 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_HINTS_DO_WARP( hints ) )
- {
- 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 );
- }
- }
-
- af_glyph_hints_save( hints, outline );
-
- Exit:
- return error;
- }
-
-
- /*************************************************************************/
- /*************************************************************************/
- /***** *****/
- /***** C J K S C R I P T C L A S S *****/
- /***** *****/
- /*************************************************************************/
- /*************************************************************************/
-
-
- AF_DEFINE_WRITING_SYSTEM_CLASS(
- af_cjk_writing_system_class,
-
- AF_WRITING_SYSTEM_CJK,
-
- sizeof ( AF_CJKMetricsRec ),
-
- (AF_WritingSystem_InitMetricsFunc) af_cjk_metrics_init, /* style_metrics_init */
- (AF_WritingSystem_ScaleMetricsFunc)af_cjk_metrics_scale, /* style_metrics_scale */
- (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done */
- (AF_WritingSystem_GetStdWidthsFunc)af_cjk_get_standard_widths, /* style_metrics_getstdw */
-
- (AF_WritingSystem_InitHintsFunc) af_cjk_hints_init, /* style_hints_init */
- (AF_WritingSystem_ApplyHintsFunc) af_cjk_hints_apply /* style_hints_apply */
- )
-
-
-#else /* !AF_CONFIG_OPTION_CJK */
-
-
- AF_DEFINE_WRITING_SYSTEM_CLASS(
- af_cjk_writing_system_class,
-
- AF_WRITING_SYSTEM_CJK,
-
- sizeof ( AF_CJKMetricsRec ),
-
- (AF_WritingSystem_InitMetricsFunc) NULL, /* style_metrics_init */
- (AF_WritingSystem_ScaleMetricsFunc)NULL, /* style_metrics_scale */
- (AF_WritingSystem_DoneMetricsFunc) NULL, /* style_metrics_done */
- (AF_WritingSystem_GetStdWidthsFunc)NULL, /* style_metrics_getstdw */
-
- (AF_WritingSystem_InitHintsFunc) NULL, /* style_hints_init */
- (AF_WritingSystem_ApplyHintsFunc) NULL /* style_hints_apply */
- )
-
-
-#endif /* !AF_CONFIG_OPTION_CJK */
-
-
-/* END */