-/***************************************************************************/\r
-/* */\r
-/* aflatin.c */\r
-/* */\r
-/* Auto-fitter hinting routines for latin script (body). */\r
-/* */\r
-/* Copyright 2003, 2004, 2005, 2006, 2007 by */\r
-/* David Turner, Robert Wilhelm, and Werner Lemberg. */\r
-/* */\r
-/* This file is part of the FreeType project, and may only be used, */\r
-/* modified, and distributed under the terms of the FreeType project */\r
-/* license, LICENSE.TXT. By continuing to use, modify, or distribute */\r
-/* this file you indicate that you have read the license and */\r
-/* understand and accept it fully. */\r
-/* */\r
-/***************************************************************************/\r
-\r
-\r
-#include "aflatin.h"\r
-#include "aferrors.h"\r
-\r
-\r
-#ifdef AF_USE_WARPER\r
-#include "afwarp.h"\r
-#endif\r
-\r
-\r
- /*************************************************************************/\r
- /*************************************************************************/\r
- /***** *****/\r
- /***** L A T I N G L O B A L M E T R I C S *****/\r
- /***** *****/\r
- /*************************************************************************/\r
- /*************************************************************************/\r
-\r
- FT_LOCAL_DEF( void )\r
- af_latin_metrics_init_widths( AF_LatinMetrics metrics,\r
- FT_Face face,\r
- FT_ULong charcode )\r
- {\r
- /* scan the array of segments in each direction */\r
- AF_GlyphHintsRec hints[1];\r
-\r
-\r
- af_glyph_hints_init( hints, face->memory );\r
-\r
- metrics->axis[AF_DIMENSION_HORZ].width_count = 0;\r
- metrics->axis[AF_DIMENSION_VERT].width_count = 0;\r
-\r
- {\r
- FT_Error error;\r
- FT_UInt glyph_index;\r
- int dim;\r
- AF_LatinMetricsRec dummy[1];\r
- AF_Scaler scaler = &dummy->root.scaler;\r
-\r
-\r
- glyph_index = FT_Get_Char_Index( face, charcode );\r
- if ( glyph_index == 0 )\r
- goto Exit;\r
-\r
- error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );\r
- if ( error || face->glyph->outline.n_points <= 0 )\r
- goto Exit;\r
-\r
- FT_ZERO( dummy );\r
-\r
- dummy->units_per_em = metrics->units_per_em;\r
- scaler->x_scale = scaler->y_scale = 0x10000L;\r
- scaler->x_delta = scaler->y_delta = 0;\r
- scaler->face = face;\r
- scaler->render_mode = FT_RENDER_MODE_NORMAL;\r
- scaler->flags = 0;\r
-\r
- af_glyph_hints_rescale( hints, (AF_ScriptMetrics)dummy );\r
-\r
- error = af_glyph_hints_reload( hints, &face->glyph->outline, 0 );\r
- if ( error )\r
- goto Exit;\r
-\r
- for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )\r
- {\r
- AF_LatinAxis axis = &metrics->axis[dim];\r
- AF_AxisHints axhints = &hints->axis[dim];\r
- AF_Segment seg, limit, link;\r
- FT_UInt num_widths = 0;\r
-\r
-\r
- error = af_latin_hints_compute_segments( hints,\r
- (AF_Dimension)dim );\r
- if ( error )\r
- goto Exit;\r
-\r
- af_latin_hints_link_segments( hints,\r
- (AF_Dimension)dim );\r
-\r
- seg = axhints->segments;\r
- limit = seg + axhints->num_segments;\r
-\r
- for ( ; seg < limit; seg++ )\r
- {\r
- link = seg->link;\r
-\r
- /* we only consider stem segments there! */\r
- if ( link && link->link == seg && link > seg )\r
- {\r
- FT_Pos dist;\r
-\r
-\r
- dist = seg->pos - link->pos;\r
- if ( dist < 0 )\r
- dist = -dist;\r
-\r
- if ( num_widths < AF_LATIN_MAX_WIDTHS )\r
- axis->widths[ num_widths++ ].org = dist;\r
- }\r
- }\r
-\r
- af_sort_widths( num_widths, axis->widths );\r
- axis->width_count = num_widths;\r
- }\r
-\r
- Exit:\r
- for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )\r
- {\r
- AF_LatinAxis axis = &metrics->axis[dim];\r
- FT_Pos stdw;\r
-\r
-\r
- stdw = ( axis->width_count > 0 )\r
- ? axis->widths[0].org\r
- : AF_LATIN_CONSTANT( metrics, 50 );\r
-\r
- /* let's try 20% of the smallest width */\r
- axis->edge_distance_threshold = stdw / 5;\r
- axis->standard_width = stdw;\r
- axis->extra_light = 0;\r
- }\r
- }\r
-\r
- af_glyph_hints_done( hints );\r
- }\r
-\r
-\r
-\r
-#define AF_LATIN_MAX_TEST_CHARACTERS 12\r
-\r
-\r
- static const char* const af_latin_blue_chars[AF_LATIN_MAX_BLUES] =\r
- {\r
- "THEZOCQS",\r
- "HEZLOCUS",\r
- "fijkdbh",\r
- "xzroesc",\r
- "xzroesc",\r
- "pqgjy"\r
- };\r
-\r
-\r
- static void\r
- af_latin_metrics_init_blues( AF_LatinMetrics metrics,\r
- FT_Face face )\r
- {\r
- FT_Pos flats [AF_LATIN_MAX_TEST_CHARACTERS];\r
- FT_Pos rounds[AF_LATIN_MAX_TEST_CHARACTERS];\r
- FT_Int num_flats;\r
- FT_Int num_rounds;\r
- FT_Int bb;\r
- AF_LatinBlue blue;\r
- FT_Error error;\r
- AF_LatinAxis axis = &metrics->axis[AF_DIMENSION_VERT];\r
- FT_GlyphSlot glyph = face->glyph;\r
-\r
-\r
- /* we compute the blues simply by loading each character from the */\r
- /* 'af_latin_blue_chars[blues]' string, then compute its top-most or */\r
- /* bottom-most points (depending on `AF_IS_TOP_BLUE') */\r
-\r
- AF_LOG(( "blue zones computation\n" ));\r
- AF_LOG(( "------------------------------------------------\n" ));\r
-\r
- for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ )\r
- {\r
- const char* p = af_latin_blue_chars[bb];\r
- const char* limit = p + AF_LATIN_MAX_TEST_CHARACTERS;\r
- FT_Pos* blue_ref;\r
- FT_Pos* blue_shoot;\r
-\r
-\r
- AF_LOG(( "blue %3d: ", bb ));\r
-\r
- num_flats = 0;\r
- num_rounds = 0;\r
-\r
- for ( ; p < limit && *p; p++ )\r
- {\r
- FT_UInt glyph_index;\r
- FT_Int best_point, best_y, best_first, best_last;\r
- FT_Vector* points;\r
- FT_Bool round = 0;\r
-\r
-\r
- AF_LOG(( "'%c'", *p ));\r
-\r
- /* load the character in the face -- skip unknown or empty ones */\r
- glyph_index = FT_Get_Char_Index( face, (FT_UInt)*p );\r
- if ( glyph_index == 0 )\r
- continue;\r
-\r
- error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );\r
- if ( error || glyph->outline.n_points <= 0 )\r
- continue;\r
-\r
- /* now compute min or max point indices and coordinates */\r
- points = glyph->outline.points;\r
- best_point = -1;\r
- best_y = 0; /* make compiler happy */\r
- best_first = 0; /* ditto */\r
- best_last = 0; /* ditto */\r
-\r
- {\r
- FT_Int nn;\r
- FT_Int first = 0;\r
- FT_Int last = -1;\r
-\r
-\r
- for ( nn = 0; nn < glyph->outline.n_contours; first = last+1, nn++ )\r
- {\r
- FT_Int old_best_point = best_point;\r
- FT_Int pp;\r
-\r
-\r
- last = glyph->outline.contours[nn];\r
-\r
- /* Avoid single-point contours since they are never rasterized. */\r
- /* In some fonts, they correspond to mark attachment points */\r
- /* which are way outside of the glyph's real outline. */\r
- if ( last <= first )\r
- continue;\r
-\r
- if ( AF_LATIN_IS_TOP_BLUE( bb ) )\r
- {\r
- for ( pp = first; pp <= last; pp++ )\r
- if ( best_point < 0 || points[pp].y > best_y )\r
- {\r
- best_point = pp;\r
- best_y = points[pp].y;\r
- }\r
- }\r
- else\r
- {\r
- for ( pp = first; pp <= last; pp++ )\r
- if ( best_point < 0 || points[pp].y < best_y )\r
- {\r
- best_point = pp;\r
- best_y = points[pp].y;\r
- }\r
- }\r
-\r
- if ( best_point != old_best_point )\r
- {\r
- best_first = first;\r
- best_last = last;\r
- }\r
- }\r
- AF_LOG(( "%5d", best_y ));\r
- }\r
-\r
- /* now check whether the point belongs to a straight or round */\r
- /* segment; we first need to find in which contour the extremum */\r
- /* lies, then inspect its previous and next points */\r
- if ( best_point >= 0 )\r
- {\r
- FT_Int prev, next;\r
- FT_Pos dist;\r
-\r
-\r
- /* now look for the previous and next points that are not on the */\r
- /* same Y coordinate. Threshold the `closeness'... */\r
- prev = best_point;\r
- next = prev;\r
-\r
- do\r
- {\r
- if ( prev > best_first )\r
- prev--;\r
- else\r
- prev = best_last;\r
-\r
- dist = points[prev].y - best_y;\r
- if ( dist < -5 || dist > 5 )\r
- break;\r
-\r
- } while ( prev != best_point );\r
-\r
- do\r
- {\r
- if ( next < best_last )\r
- next++;\r
- else\r
- next = best_first;\r
-\r
- dist = points[next].y - best_y;\r
- if ( dist < -5 || dist > 5 )\r
- break;\r
-\r
- } while ( next != best_point );\r
-\r
- /* now, set the `round' flag depending on the segment's kind */\r
- round = FT_BOOL(\r
- FT_CURVE_TAG( glyph->outline.tags[prev] ) != FT_CURVE_TAG_ON ||\r
- FT_CURVE_TAG( glyph->outline.tags[next] ) != FT_CURVE_TAG_ON );\r
-\r
- AF_LOG(( "%c ", round ? 'r' : 'f' ));\r
- }\r
-\r
- if ( round )\r
- rounds[num_rounds++] = best_y;\r
- else\r
- flats[num_flats++] = best_y;\r
- }\r
-\r
- AF_LOG(( "\n" ));\r
-\r
- if ( num_flats == 0 && num_rounds == 0 )\r
- {\r
- /*\r
- * we couldn't find a single glyph to compute this blue zone,\r
- * we will simply ignore it then\r
- */\r
- AF_LOG(( "empty!\n" ));\r
- continue;\r
- }\r
-\r
- /* we have computed the contents of the `rounds' and `flats' tables, */\r
- /* now determine the reference and overshoot position of the blue -- */\r
- /* we simply take the median value after a simple sort */\r
- af_sort_pos( num_rounds, rounds );\r
- af_sort_pos( num_flats, flats );\r
-\r
- blue = & axis->blues[axis->blue_count];\r
- blue_ref = & blue->ref.org;\r
- blue_shoot = & blue->shoot.org;\r
-\r
- axis->blue_count++;\r
-\r
- if ( num_flats == 0 )\r
- {\r
- *blue_ref =\r
- *blue_shoot = rounds[num_rounds / 2];\r
- }\r
- else if ( num_rounds == 0 )\r
- {\r
- *blue_ref =\r
- *blue_shoot = flats[num_flats / 2];\r
- }\r
- else\r
- {\r
- *blue_ref = flats[num_flats / 2];\r
- *blue_shoot = rounds[num_rounds / 2];\r
- }\r
-\r
- /* there are sometimes problems: if the overshoot position of top */\r
- /* zones is under its reference position, or the opposite for bottom */\r
- /* zones. We must thus check everything there and correct the errors */\r
- if ( *blue_shoot != *blue_ref )\r
- {\r
- FT_Pos ref = *blue_ref;\r
- FT_Pos shoot = *blue_shoot;\r
- FT_Bool over_ref = FT_BOOL( shoot > ref );\r
-\r
-\r
- if ( AF_LATIN_IS_TOP_BLUE( bb ) ^ over_ref )\r
- *blue_shoot = *blue_ref = ( shoot + ref ) / 2;\r
- }\r
-\r
- blue->flags = 0;\r
- if ( AF_LATIN_IS_TOP_BLUE( bb ) )\r
- blue->flags |= AF_LATIN_BLUE_TOP;\r
-\r
- /*\r
- * The following flags is used later to adjust the y and x scales\r
- * in order to optimize the pixel grid alignment of the top of small\r
- * letters.\r
- */\r
- if ( bb == AF_LATIN_BLUE_SMALL_TOP )\r
- blue->flags |= AF_LATIN_BLUE_ADJUSTMENT;\r
-\r
- AF_LOG(( "-- ref = %ld, shoot = %ld\n", *blue_ref, *blue_shoot ));\r
- }\r
-\r
- return;\r
- }\r
-\r
-\r
- FT_LOCAL_DEF( FT_Error )\r
- af_latin_metrics_init( AF_LatinMetrics metrics,\r
- FT_Face face )\r
- {\r
- FT_Error error = AF_Err_Ok;\r
- FT_CharMap oldmap = face->charmap;\r
- FT_UInt ee;\r
-\r
- static const FT_Encoding latin_encodings[] =\r
- {\r
- FT_ENCODING_UNICODE,\r
- FT_ENCODING_APPLE_ROMAN,\r
- FT_ENCODING_ADOBE_STANDARD,\r
- FT_ENCODING_ADOBE_LATIN_1,\r
- FT_ENCODING_NONE /* end of list */\r
- };\r
-\r
-\r
- metrics->units_per_em = face->units_per_EM;\r
-\r
- /* do we have a latin charmap in there? */\r
- for ( ee = 0; latin_encodings[ee] != FT_ENCODING_NONE; ee++ )\r
- {\r
- error = FT_Select_Charmap( face, latin_encodings[ee] );\r
- if ( !error )\r
- break;\r
- }\r
-\r
- if ( !error )\r
- {\r
- /* For now, compute the standard width and height from the `o'. */\r
- af_latin_metrics_init_widths( metrics, face, 'o' );\r
- af_latin_metrics_init_blues( metrics, face );\r
- }\r
-\r
- FT_Set_Charmap( face, oldmap );\r
- return AF_Err_Ok;\r
- }\r
-\r
-\r
- static void\r
- af_latin_metrics_scale_dim( AF_LatinMetrics metrics,\r
- AF_Scaler scaler,\r
- AF_Dimension dim )\r
- {\r
- FT_Fixed scale;\r
- FT_Pos delta;\r
- AF_LatinAxis axis;\r
- FT_UInt nn;\r
-\r
-\r
- if ( dim == AF_DIMENSION_HORZ )\r
- {\r
- scale = scaler->x_scale;\r
- delta = scaler->x_delta;\r
- }\r
- else\r
- {\r
- scale = scaler->y_scale;\r
- delta = scaler->y_delta;\r
- }\r
-\r
- axis = &metrics->axis[dim];\r
-\r
- if ( axis->org_scale == scale && axis->org_delta == delta )\r
- return;\r
-\r
- axis->org_scale = scale;\r
- axis->org_delta = delta;\r
-\r
- /*\r
- * correct X and Y scale to optimize the alignment of the top of small\r
- * letters to the pixel grid\r
- */\r
- {\r
- AF_LatinAxis Axis = &metrics->axis[AF_DIMENSION_VERT];\r
- AF_LatinBlue blue = NULL;\r
-\r
-\r
- for ( nn = 0; nn < Axis->blue_count; nn++ )\r
- {\r
- if ( Axis->blues[nn].flags & AF_LATIN_BLUE_ADJUSTMENT )\r
- {\r
- blue = &Axis->blues[nn];\r
- break;\r
- }\r
- }\r
-\r
- if ( blue )\r
- {\r
- FT_Pos scaled = FT_MulFix( blue->shoot.org, scaler->y_scale );\r
- FT_Pos fitted = ( scaled + 40 ) & ~63;\r
-\r
-\r
- if ( scaled != fitted )\r
- {\r
-#if 0\r
- if ( dim == AF_DIMENSION_HORZ )\r
- {\r
- if ( fitted < scaled )\r
- scale -= scale / 50; /* scale *= 0.98 */\r
- }\r
- else\r
-#endif\r
- if ( dim == AF_DIMENSION_VERT )\r
- {\r
- scale = FT_MulDiv( scale, fitted, scaled );\r
- }\r
- }\r
- }\r
- }\r
-\r
- axis->scale = scale;\r
- axis->delta = delta;\r
-\r
- if ( dim == AF_DIMENSION_HORZ )\r
- {\r
- metrics->root.scaler.x_scale = scale;\r
- metrics->root.scaler.x_delta = delta;\r
- }\r
- else\r
- {\r
- metrics->root.scaler.y_scale = scale;\r
- metrics->root.scaler.y_delta = delta;\r
- }\r
-\r
- /* scale the standard widths */\r
- for ( nn = 0; nn < axis->width_count; nn++ )\r
- {\r
- AF_Width width = axis->widths + nn;\r
-\r
-\r
- width->cur = FT_MulFix( width->org, scale );\r
- width->fit = width->cur;\r
- }\r
-\r
- /* an extra-light axis corresponds to a standard width that is */\r
- /* smaller than 0.75 pixels */\r
- axis->extra_light =\r
- (FT_Bool)( FT_MulFix( axis->standard_width, scale ) < 32 + 8 );\r
-\r
- if ( dim == AF_DIMENSION_VERT )\r
- {\r
- /* scale the blue zones */\r
- for ( nn = 0; nn < axis->blue_count; nn++ )\r
- {\r
- AF_LatinBlue blue = &axis->blues[nn];\r
- FT_Pos dist;\r
-\r
-\r
- blue->ref.cur = FT_MulFix( blue->ref.org, scale ) + delta;\r
- blue->ref.fit = blue->ref.cur;\r
- blue->shoot.cur = FT_MulFix( blue->shoot.org, scale ) + delta;\r
- blue->shoot.fit = blue->shoot.cur;\r
- blue->flags &= ~AF_LATIN_BLUE_ACTIVE;\r
-\r
- /* a blue zone is only active if it is less than 3/4 pixels tall */\r
- dist = FT_MulFix( blue->ref.org - blue->shoot.org, scale );\r
- if ( dist <= 48 && dist >= -48 )\r
- {\r
- FT_Pos delta1, delta2;\r
-\r
-\r
- delta1 = blue->shoot.org - blue->ref.org;\r
- delta2 = delta1;\r
- if ( delta1 < 0 )\r
- delta2 = -delta2;\r
-\r
- delta2 = FT_MulFix( delta2, scale );\r
-\r
- if ( delta2 < 32 )\r
- delta2 = 0;\r
- else if ( delta2 < 64 )\r
- delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 );\r
- else\r
- delta2 = FT_PIX_ROUND( delta2 );\r
-\r
- if ( delta1 < 0 )\r
- delta2 = -delta2;\r
-\r
- blue->ref.fit = FT_PIX_ROUND( blue->ref.cur );\r
- blue->shoot.fit = blue->ref.fit + delta2;\r
-\r
- blue->flags |= AF_LATIN_BLUE_ACTIVE;\r
- }\r
- }\r
- }\r
- }\r
-\r
-\r
- FT_LOCAL_DEF( void )\r
- af_latin_metrics_scale( AF_LatinMetrics metrics,\r
- AF_Scaler scaler )\r
- {\r
- metrics->root.scaler.render_mode = scaler->render_mode;\r
- metrics->root.scaler.face = scaler->face;\r
-\r
- af_latin_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ );\r
- af_latin_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT );\r
- }\r
-\r
-\r
- /*************************************************************************/\r
- /*************************************************************************/\r
- /***** *****/\r
- /***** L A T I N G L Y P H A N A L Y S I S *****/\r
- /***** *****/\r
- /*************************************************************************/\r
- /*************************************************************************/\r
-\r
- FT_LOCAL_DEF( FT_Error )\r
- af_latin_hints_compute_segments( AF_GlyphHints hints,\r
- AF_Dimension dim )\r
- {\r
- AF_AxisHints axis = &hints->axis[dim];\r
- FT_Memory memory = hints->memory;\r
- FT_Error error = AF_Err_Ok;\r
- AF_Segment segment = NULL;\r
- AF_SegmentRec seg0;\r
- AF_Point* contour = hints->contours;\r
- AF_Point* contour_limit = contour + hints->num_contours;\r
- AF_Direction major_dir, segment_dir;\r
-\r
-\r
- FT_ZERO( &seg0 );\r
- seg0.score = 32000;\r
- seg0.flags = AF_EDGE_NORMAL;\r
-\r
- major_dir = (AF_Direction)FT_ABS( axis->major_dir );\r
- segment_dir = major_dir;\r
-\r
- axis->num_segments = 0;\r
-\r
- /* set up (u,v) in each point */\r
- if ( dim == AF_DIMENSION_HORZ )\r
- {\r
- AF_Point point = hints->points;\r
- AF_Point limit = point + hints->num_points;\r
-\r
-\r
- for ( ; point < limit; point++ )\r
- {\r
- point->u = point->fx;\r
- point->v = point->fy;\r
- }\r
- }\r
- else\r
- {\r
- AF_Point point = hints->points;\r
- AF_Point limit = point + hints->num_points;\r
-\r
-\r
- for ( ; point < limit; point++ )\r
- {\r
- point->u = point->fy;\r
- point->v = point->fx;\r
- }\r
- }\r
-\r
- /* do each contour separately */\r
- for ( ; contour < contour_limit; contour++ )\r
- {\r
- AF_Point point = contour[0];\r
- AF_Point last = point->prev;\r
- int on_edge = 0;\r
- FT_Pos min_pos = 32000; /* minimum segment pos != min_coord */\r
- FT_Pos max_pos = -32000; /* maximum segment pos != max_coord */\r
- FT_Bool passed;\r
-\r
-\r
- if ( point == last ) /* skip singletons -- just in case */\r
- continue;\r
-\r
- if ( FT_ABS( last->out_dir ) == major_dir &&\r
- FT_ABS( point->out_dir ) == major_dir )\r
- {\r
- /* we are already on an edge, try to locate its start */\r
- last = point;\r
-\r
- for (;;)\r
- {\r
- point = point->prev;\r
- if ( FT_ABS( point->out_dir ) != major_dir )\r
- {\r
- point = point->next;\r
- break;\r
- }\r
- if ( point == last )\r
- break;\r
- }\r
- }\r
-\r
- last = point;\r
- passed = 0;\r
-\r
- for (;;)\r
- {\r
- FT_Pos u, v;\r
-\r
-\r
- if ( on_edge )\r
- {\r
- u = point->u;\r
- if ( u < min_pos )\r
- min_pos = u;\r
- if ( u > max_pos )\r
- max_pos = u;\r
-\r
- if ( point->out_dir != segment_dir || point == last )\r
- {\r
- /* we are just leaving an edge; record a new segment! */\r
- segment->last = point;\r
- segment->pos = (FT_Short)( ( min_pos + max_pos ) >> 1 );\r
-\r
- /* a segment is round if either its first or last point */\r
- /* is a control point */\r
- if ( ( segment->first->flags | point->flags ) &\r
- AF_FLAG_CONTROL )\r
- segment->flags |= AF_EDGE_ROUND;\r
-\r
- /* compute segment size */\r
- min_pos = max_pos = point->v;\r
-\r
- v = segment->first->v;\r
- if ( v < min_pos )\r
- min_pos = v;\r
- if ( v > max_pos )\r
- max_pos = v;\r
-\r
- segment->min_coord = (FT_Short)min_pos;\r
- segment->max_coord = (FT_Short)max_pos;\r
- segment->height = (FT_Short)( segment->max_coord -\r
- segment->min_coord );\r
-\r
- on_edge = 0;\r
- segment = NULL;\r
- /* fallthrough */\r
- }\r
- }\r
-\r
- /* now exit if we are at the start/end point */\r
- if ( point == last )\r
- {\r
- if ( passed )\r
- break;\r
- passed = 1;\r
- }\r
-\r
- if ( !on_edge && FT_ABS( point->out_dir ) == major_dir )\r
- {\r
- /* this is the start of a new segment! */\r
- segment_dir = (AF_Direction)point->out_dir;\r
-\r
- /* clear all segment fields */\r
- error = af_axis_hints_new_segment( axis, memory, &segment );\r
- if ( error )\r
- goto Exit;\r
-\r
- segment[0] = seg0;\r
- segment->dir = (FT_Char)segment_dir;\r
- min_pos = max_pos = point->u;\r
- segment->first = point;\r
- segment->last = point;\r
- segment->contour = contour;\r
- on_edge = 1;\r
- }\r
-\r
- point = point->next;\r
- }\r
-\r
- } /* contours */\r
-\r
-\r
- /* now slightly increase the height of segments when this makes */\r
- /* sense -- this is used to better detect and ignore serifs */\r
- {\r
- AF_Segment segments = axis->segments;\r
- AF_Segment segments_end = segments + axis->num_segments;\r
-\r
-\r
- for ( segment = segments; segment < segments_end; segment++ )\r
- {\r
- AF_Point first = segment->first;\r
- AF_Point last = segment->last;\r
- FT_Pos first_v = first->v;\r
- FT_Pos last_v = last->v;\r
-\r
-\r
- if ( first == last )\r
- continue;\r
-\r
- if ( first_v < last_v )\r
- {\r
- AF_Point p;\r
-\r
-\r
- p = first->prev;\r
- if ( p->v < first_v )\r
- segment->height = (FT_Short)( segment->height +\r
- ( ( first_v - p->v ) >> 1 ) );\r
-\r
- p = last->next;\r
- if ( p->v > last_v )\r
- segment->height = (FT_Short)( segment->height +\r
- ( ( p->v - last_v ) >> 1 ) );\r
- }\r
- else\r
- {\r
- AF_Point p;\r
-\r
-\r
- p = first->prev;\r
- if ( p->v > first_v )\r
- segment->height = (FT_Short)( segment->height +\r
- ( ( p->v - first_v ) >> 1 ) );\r
-\r
- p = last->next;\r
- if ( p->v < last_v )\r
- segment->height = (FT_Short)( segment->height +\r
- ( ( last_v - p->v ) >> 1 ) );\r
- }\r
- }\r
- }\r
-\r
- Exit:\r
- return error;\r
- }\r
-\r
-\r
- FT_LOCAL_DEF( void )\r
- af_latin_hints_link_segments( AF_GlyphHints hints,\r
- AF_Dimension dim )\r
- {\r
- AF_AxisHints axis = &hints->axis[dim];\r
- AF_Segment segments = axis->segments;\r
- AF_Segment segment_limit = segments + axis->num_segments;\r
- FT_Pos len_threshold, len_score;\r
- AF_Segment seg1, seg2;\r
-\r
-\r
- len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 );\r
- if ( len_threshold == 0 )\r
- len_threshold = 1;\r
-\r
- len_score = AF_LATIN_CONSTANT( hints->metrics, 6000 );\r
-\r
- /* now compare each segment to the others */\r
- for ( seg1 = segments; seg1 < segment_limit; seg1++ )\r
- {\r
- /* the fake segments are introduced to hint the metrics -- */\r
- /* we must never link them to anything */\r
- if ( seg1->dir != axis->major_dir || seg1->first == seg1->last )\r
- continue;\r
-\r
- for ( seg2 = segments; seg2 < segment_limit; seg2++ )\r
- if ( seg1->dir + seg2->dir == 0 && seg2->pos > seg1->pos )\r
- {\r
- FT_Pos pos1 = seg1->pos;\r
- FT_Pos pos2 = seg2->pos;\r
- FT_Pos dist = pos2 - pos1;\r
-\r
-\r
- if ( dist < 0 )\r
- dist = -dist;\r
-\r
- {\r
- FT_Pos min = seg1->min_coord;\r
- FT_Pos max = seg1->max_coord;\r
- FT_Pos len, score;\r
-\r
-\r
- if ( min < seg2->min_coord )\r
- min = seg2->min_coord;\r
-\r
- if ( max > seg2->max_coord )\r
- max = seg2->max_coord;\r
-\r
- len = max - min;\r
- if ( len >= len_threshold )\r
- {\r
- score = dist + len_score / len;\r
-\r
- if ( score < seg1->score )\r
- {\r
- seg1->score = score;\r
- seg1->link = seg2;\r
- }\r
-\r
- if ( score < seg2->score )\r
- {\r
- seg2->score = score;\r
- seg2->link = seg1;\r
- }\r
- }\r
- }\r
- }\r
- }\r
-\r
- /* now, compute the `serif' segments */\r
- for ( seg1 = segments; seg1 < segment_limit; seg1++ )\r
- {\r
- seg2 = seg1->link;\r
-\r
- if ( seg2 )\r
- {\r
- if ( seg2->link != seg1 )\r
- {\r
- seg1->link = 0;\r
- seg1->serif = seg2->link;\r
- }\r
- }\r
- }\r
- }\r
-\r
-\r
- FT_LOCAL_DEF( FT_Error )\r
- af_latin_hints_compute_edges( AF_GlyphHints hints,\r
- AF_Dimension dim )\r
- {\r
- AF_AxisHints axis = &hints->axis[dim];\r
- FT_Error error = AF_Err_Ok;\r
- FT_Memory memory = hints->memory;\r
- AF_LatinAxis laxis = &((AF_LatinMetrics)hints->metrics)->axis[dim];\r
-\r
- AF_Segment segments = axis->segments;\r
- AF_Segment segment_limit = segments + axis->num_segments;\r
- AF_Segment seg;\r
-\r
- AF_Direction up_dir;\r
- FT_Fixed scale;\r
- FT_Pos edge_distance_threshold;\r
- FT_Pos segment_length_threshold;\r
-\r
-\r
- axis->num_edges = 0;\r
-\r
- scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale\r
- : hints->y_scale;\r
-\r
- up_dir = ( dim == AF_DIMENSION_HORZ ) ? AF_DIR_UP\r
- : AF_DIR_RIGHT;\r
-\r
- /*\r
- * We ignore all segments that are less than 1 pixels in length,\r
- * to avoid many problems with serif fonts. We compute the\r
- * corresponding threshold in font units.\r
- */\r
- if ( dim == AF_DIMENSION_HORZ )\r
- segment_length_threshold = FT_DivFix( 64, hints->y_scale );\r
- else\r
- segment_length_threshold = 0;\r
-\r
- /*********************************************************************/\r
- /* */\r
- /* We will begin by generating a sorted table of edges for the */\r
- /* current direction. To do so, we simply scan each segment and try */\r
- /* to find an edge in our table that corresponds to its position. */\r
- /* */\r
- /* If no edge is found, we create and insert a new edge in the */\r
- /* sorted table. Otherwise, we simply add the segment to the edge's */\r
- /* list which will be processed in the second step to compute the */\r
- /* edge's properties. */\r
- /* */\r
- /* Note that the edges table is sorted along the segment/edge */\r
- /* position. */\r
- /* */\r
- /*********************************************************************/\r
-\r
- edge_distance_threshold = FT_MulFix( laxis->edge_distance_threshold,\r
- scale );\r
- if ( edge_distance_threshold > 64 / 4 )\r
- edge_distance_threshold = 64 / 4;\r
-\r
- edge_distance_threshold = FT_DivFix( edge_distance_threshold,\r
- scale );\r
-\r
- for ( seg = segments; seg < segment_limit; seg++ )\r
- {\r
- AF_Edge found = 0;\r
- FT_Int ee;\r
-\r
-\r
- if ( seg->height < segment_length_threshold )\r
- continue;\r
-\r
- /* A special case for serif edges: If they are smaller than */\r
- /* 1.5 pixels we ignore them. */\r
- if ( seg->serif &&\r
- 2 * seg->height < 3 * segment_length_threshold )\r
- continue;\r
-\r
- /* look for an edge corresponding to the segment */\r
- for ( ee = 0; ee < axis->num_edges; ee++ )\r
- {\r
- AF_Edge edge = axis->edges + ee;\r
- FT_Pos dist;\r
-\r
-\r
- dist = seg->pos - edge->fpos;\r
- if ( dist < 0 )\r
- dist = -dist;\r
-\r
- if ( dist < edge_distance_threshold && edge->dir == seg->dir )\r
- {\r
- found = edge;\r
- break;\r
- }\r
- }\r
-\r
- if ( !found )\r
- {\r
- AF_Edge edge;\r
-\r
-\r
- /* insert a new edge in the list and */\r
- /* sort according to the position */\r
- error = af_axis_hints_new_edge( axis, seg->pos, seg->dir, memory, &edge );\r
- if ( error )\r
- goto Exit;\r
-\r
- /* add the segment to the new edge's list */\r
- FT_ZERO( edge );\r
-\r
- edge->first = seg;\r
- edge->last = seg;\r
- edge->fpos = seg->pos;\r
- edge->dir = seg->dir;\r
- edge->opos = edge->pos = FT_MulFix( seg->pos, scale );\r
- seg->edge_next = seg;\r
- }\r
- else\r
- {\r
- /* if an edge was found, simply add the segment to the edge's */\r
- /* list */\r
- seg->edge_next = found->first;\r
- found->last->edge_next = seg;\r
- found->last = seg;\r
- }\r
- }\r
-\r
-\r
- /*********************************************************************/\r
- /* */\r
- /* Good, we will now compute each edge's properties according to */\r
- /* segments found on its position. Basically, these are: */\r
- /* */\r
- /* - edge's main direction */\r
- /* - stem edge, serif edge or both (which defaults to stem then) */\r
- /* - rounded edge, straight or both (which defaults to straight) */\r
- /* - link for edge */\r
- /* */\r
- /*********************************************************************/\r
-\r
- /* first of all, set the `edge' field in each segment -- this is */\r
- /* required in order to compute edge links */\r
-\r
- /*\r
- * Note that removing this loop and setting the `edge' field of each\r
- * segment directly in the code above slows down execution speed for\r
- * some reasons on platforms like the Sun.\r
- */\r
- {\r
- AF_Edge edges = axis->edges;\r
- AF_Edge edge_limit = edges + axis->num_edges;\r
- AF_Edge edge;\r
-\r
-\r
- for ( edge = edges; edge < edge_limit; edge++ )\r
- {\r
- seg = edge->first;\r
- if ( seg )\r
- do\r
- {\r
- seg->edge = edge;\r
- seg = seg->edge_next;\r
-\r
- } while ( seg != edge->first );\r
- }\r
-\r
- /* now, compute each edge properties */\r
- for ( edge = edges; edge < edge_limit; edge++ )\r
- {\r
- FT_Int is_round = 0; /* does it contain round segments? */\r
- FT_Int is_straight = 0; /* does it contain straight segments? */\r
- FT_Pos ups = 0; /* number of upwards segments */\r
- FT_Pos downs = 0; /* number of downwards segments */\r
-\r
-\r
- seg = edge->first;\r
-\r
- do\r
- {\r
- FT_Bool is_serif;\r
-\r
-\r
- /* check for roundness of segment */\r
- if ( seg->flags & AF_EDGE_ROUND )\r
- is_round++;\r
- else\r
- is_straight++;\r
-\r
- /* check for segment direction */\r
- if ( seg->dir == up_dir )\r
- ups += seg->max_coord-seg->min_coord;\r
- else\r
- downs += seg->max_coord-seg->min_coord;\r
-\r
- /* check for links -- if seg->serif is set, then seg->link must */\r
- /* be ignored */\r
- is_serif = (FT_Bool)( seg->serif &&\r
- seg->serif->edge &&\r
- seg->serif->edge != edge );\r
-\r
- if ( ( seg->link && seg->link->edge != NULL ) || is_serif )\r
- {\r
- AF_Edge edge2;\r
- AF_Segment seg2;\r
-\r
-\r
- edge2 = edge->link;\r
- seg2 = seg->link;\r
-\r
- if ( is_serif )\r
- {\r
- seg2 = seg->serif;\r
- edge2 = edge->serif;\r
- }\r
-\r
- if ( edge2 )\r
- {\r
- FT_Pos edge_delta;\r
- FT_Pos seg_delta;\r
-\r
-\r
- edge_delta = edge->fpos - edge2->fpos;\r
- if ( edge_delta < 0 )\r
- edge_delta = -edge_delta;\r
-\r
- seg_delta = seg->pos - seg2->pos;\r
- if ( seg_delta < 0 )\r
- seg_delta = -seg_delta;\r
-\r
- if ( seg_delta < edge_delta )\r
- edge2 = seg2->edge;\r
- }\r
- else\r
- edge2 = seg2->edge;\r
-\r
- if ( is_serif )\r
- {\r
- edge->serif = edge2;\r
- edge2->flags |= AF_EDGE_SERIF;\r
- }\r
- else\r
- edge->link = edge2;\r
- }\r
-\r
- seg = seg->edge_next;\r
-\r
- } while ( seg != edge->first );\r
-\r
- /* set the round/straight flags */\r
- edge->flags = AF_EDGE_NORMAL;\r
-\r
- if ( is_round > 0 && is_round >= is_straight )\r
- edge->flags |= AF_EDGE_ROUND;\r
-\r
-#if 0\r
- /* set the edge's main direction */\r
- edge->dir = AF_DIR_NONE;\r
-\r
- if ( ups > downs )\r
- edge->dir = (FT_Char)up_dir;\r
-\r
- else if ( ups < downs )\r
- edge->dir = (FT_Char)-up_dir;\r
-\r
- else if ( ups == downs )\r
- edge->dir = 0; /* both up and down! */\r
-#endif\r
-\r
- /* gets rid of serifs if link is set */\r
- /* XXX: This gets rid of many unpleasant artefacts! */\r
- /* Example: the `c' in cour.pfa at size 13 */\r
-\r
- if ( edge->serif && edge->link )\r
- edge->serif = 0;\r
- }\r
- }\r
-\r
- Exit:\r
- return error;\r
- }\r
-\r
-\r
- FT_LOCAL_DEF( FT_Error )\r
- af_latin_hints_detect_features( AF_GlyphHints hints,\r
- AF_Dimension dim )\r
- {\r
- FT_Error error;\r
-\r
-\r
- error = af_latin_hints_compute_segments( hints, dim );\r
- if ( !error )\r
- {\r
- af_latin_hints_link_segments( hints, dim );\r
-\r
- error = af_latin_hints_compute_edges( hints, dim );\r
- }\r
- return error;\r
- }\r
-\r
-\r
- FT_LOCAL_DEF( void )\r
- af_latin_hints_compute_blue_edges( AF_GlyphHints hints,\r
- AF_LatinMetrics metrics )\r
- {\r
- AF_AxisHints axis = &hints->axis[ AF_DIMENSION_VERT ];\r
- AF_Edge edge = axis->edges;\r
- AF_Edge edge_limit = edge + axis->num_edges;\r
- AF_LatinAxis latin = &metrics->axis[ AF_DIMENSION_VERT ];\r
- FT_Fixed scale = latin->scale;\r
-\r
-\r
- /* compute which blue zones are active, i.e. have their scaled */\r
- /* size < 3/4 pixels */\r
-\r
- /* for each horizontal edge search the blue zone which is closest */\r
- for ( ; edge < edge_limit; edge++ )\r
- {\r
- FT_Int bb;\r
- AF_Width best_blue = NULL;\r
- FT_Pos best_dist; /* initial threshold */\r
-\r
-\r
- /* compute the initial threshold as a fraction of the EM size */\r
- best_dist = FT_MulFix( metrics->units_per_em / 40, scale );\r
-\r
- if ( best_dist > 64 / 2 )\r
- best_dist = 64 / 2;\r
-\r
- for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ )\r
- {\r
- AF_LatinBlue blue = latin->blues + bb;\r
- FT_Bool is_top_blue, is_major_dir;\r
-\r
-\r
- /* skip inactive blue zones (i.e., those that are too small) */\r
- if ( !( blue->flags & AF_LATIN_BLUE_ACTIVE ) )\r
- continue;\r
-\r
- /* if it is a top zone, check for right edges -- if it is a bottom */\r
- /* zone, check for left edges */\r
- /* */\r
- /* of course, that's for TrueType */\r
- is_top_blue = (FT_Byte)( ( blue->flags & AF_LATIN_BLUE_TOP ) != 0 );\r
- is_major_dir = FT_BOOL( edge->dir == axis->major_dir );\r
-\r
- /* if it is a top zone, the edge must be against the major */\r
- /* direction; if it is a bottom zone, it must be in the major */\r
- /* direction */\r
- if ( is_top_blue ^ is_major_dir )\r
- {\r
- FT_Pos dist;\r
-\r
-\r
- /* first of all, compare it to the reference position */\r
- dist = edge->fpos - blue->ref.org;\r
- if ( dist < 0 )\r
- dist = -dist;\r
-\r
- dist = FT_MulFix( dist, scale );\r
- if ( dist < best_dist )\r
- {\r
- best_dist = dist;\r
- best_blue = & blue->ref;\r
- }\r
-\r
- /* now, compare it to the overshoot position if the edge is */\r
- /* rounded, and if the edge is over the reference position of a */\r
- /* top zone, or under the reference position of a bottom zone */\r
- if ( edge->flags & AF_EDGE_ROUND && dist != 0 )\r
- {\r
- FT_Bool is_under_ref = FT_BOOL( edge->fpos < blue->ref.org );\r
-\r
-\r
- if ( is_top_blue ^ is_under_ref )\r
- {\r
- blue = latin->blues + bb;\r
- dist = edge->fpos - blue->shoot.org;\r
- if ( dist < 0 )\r
- dist = -dist;\r
-\r
- dist = FT_MulFix( dist, scale );\r
- if ( dist < best_dist )\r
- {\r
- best_dist = dist;\r
- best_blue = & blue->shoot;\r
- }\r
- }\r
- }\r
- }\r
- }\r
-\r
- if ( best_blue )\r
- edge->blue_edge = best_blue;\r
- }\r
- }\r
-\r
-\r
- static FT_Error\r
- af_latin_hints_init( AF_GlyphHints hints,\r
- AF_LatinMetrics metrics )\r
- {\r
- FT_Render_Mode mode;\r
- FT_UInt32 scaler_flags, other_flags;\r
- FT_Face face = metrics->root.scaler.face;\r
-\r
-\r
- af_glyph_hints_rescale( hints, (AF_ScriptMetrics)metrics );\r
-\r
- /*\r
- * correct x_scale and y_scale if needed, since they may have\r
- * been modified `af_latin_metrics_scale_dim' above\r
- */\r
- hints->x_scale = metrics->axis[AF_DIMENSION_HORZ].scale;\r
- hints->x_delta = metrics->axis[AF_DIMENSION_HORZ].delta;\r
- hints->y_scale = metrics->axis[AF_DIMENSION_VERT].scale;\r
- hints->y_delta = metrics->axis[AF_DIMENSION_VERT].delta;\r
-\r
- /* compute flags depending on render mode, etc. */\r
- mode = metrics->root.scaler.render_mode;\r
-\r
-#if 0 /* #ifdef AF_USE_WARPER */\r
- if ( mode == FT_RENDER_MODE_LCD || mode == FT_RENDER_MODE_LCD_V )\r
- {\r
- metrics->root.scaler.render_mode = mode = FT_RENDER_MODE_NORMAL;\r
- }\r
-#endif\r
-\r
- scaler_flags = hints->scaler_flags;\r
- other_flags = 0;\r
-\r
- /*\r
- * We snap the width of vertical stems for the monochrome and\r
- * horizontal LCD rendering targets only.\r
- */\r
- if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD )\r
- other_flags |= AF_LATIN_HINTS_HORZ_SNAP;\r
-\r
- /*\r
- * We snap the width of horizontal stems for the monochrome and\r
- * vertical LCD rendering targets only.\r
- */\r
- if ( mode == FT_RENDER_MODE_MONO || mode == FT_RENDER_MODE_LCD_V )\r
- other_flags |= AF_LATIN_HINTS_VERT_SNAP;\r
-\r
- /*\r
- * We adjust stems to full pixels only if we don't use the `light' mode.\r
- */\r
- if ( mode != FT_RENDER_MODE_LIGHT )\r
- other_flags |= AF_LATIN_HINTS_STEM_ADJUST;\r
-\r
- if ( mode == FT_RENDER_MODE_MONO )\r
- other_flags |= AF_LATIN_HINTS_MONO;\r
-\r
- /*\r
- * In `light' hinting mode we disable horizontal hinting completely.\r
- * We also do it if the face is italic.\r
- */\r
- if ( mode == FT_RENDER_MODE_LIGHT ||\r
- (face->style_flags & FT_STYLE_FLAG_ITALIC) != 0 )\r
- scaler_flags |= AF_SCALER_FLAG_NO_HORIZONTAL;\r
-\r
- hints->scaler_flags = scaler_flags;\r
- hints->other_flags = other_flags;\r
-\r
- return 0;\r
- }\r
-\r
-\r
- /*************************************************************************/\r
- /*************************************************************************/\r
- /***** *****/\r
- /***** L A T I N G L Y P H G R I D - F I T T I N G *****/\r
- /***** *****/\r
- /*************************************************************************/\r
- /*************************************************************************/\r
-\r
- /* snap a given width in scaled coordinates to one of the */\r
- /* current standard widths */\r
-\r
- static FT_Pos\r
- af_latin_snap_width( AF_Width widths,\r
- FT_Int count,\r
- FT_Pos width )\r
- {\r
- int n;\r
- FT_Pos best = 64 + 32 + 2;\r
- FT_Pos reference = width;\r
- FT_Pos scaled;\r
-\r
-\r
- for ( n = 0; n < count; n++ )\r
- {\r
- FT_Pos w;\r
- FT_Pos dist;\r
-\r
-\r
- w = widths[n].cur;\r
- dist = width - w;\r
- if ( dist < 0 )\r
- dist = -dist;\r
- if ( dist < best )\r
- {\r
- best = dist;\r
- reference = w;\r
- }\r
- }\r
-\r
- scaled = FT_PIX_ROUND( reference );\r
-\r
- if ( width >= reference )\r
- {\r
- if ( width < scaled + 48 )\r
- width = reference;\r
- }\r
- else\r
- {\r
- if ( width > scaled - 48 )\r
- width = reference;\r
- }\r
-\r
- return width;\r
- }\r
-\r
-\r
- /* compute the snapped width of a given stem */\r
-\r
- static FT_Pos\r
- af_latin_compute_stem_width( AF_GlyphHints hints,\r
- AF_Dimension dim,\r
- FT_Pos width,\r
- AF_Edge_Flags base_flags,\r
- AF_Edge_Flags stem_flags )\r
- {\r
- AF_LatinMetrics metrics = (AF_LatinMetrics) hints->metrics;\r
- AF_LatinAxis axis = & metrics->axis[dim];\r
- FT_Pos dist = width;\r
- FT_Int sign = 0;\r
- FT_Int vertical = ( dim == AF_DIMENSION_VERT );\r
-\r
-\r
- if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ||\r
- axis->extra_light )\r
- return width;\r
-\r
- if ( dist < 0 )\r
- {\r
- dist = -width;\r
- sign = 1;\r
- }\r
-\r
- if ( ( vertical && !AF_LATIN_HINTS_DO_VERT_SNAP( hints ) ) ||\r
- ( !vertical && !AF_LATIN_HINTS_DO_HORZ_SNAP( hints ) ) )\r
- {\r
- /* smooth hinting process: very lightly quantize the stem width */\r
-\r
- /* leave the widths of serifs alone */\r
-\r
- if ( ( stem_flags & AF_EDGE_SERIF ) && vertical && ( dist < 3 * 64 ) )\r
- goto Done_Width;\r
-\r
- else if ( ( base_flags & AF_EDGE_ROUND ) )\r
- {\r
- if ( dist < 80 )\r
- dist = 64;\r
- }\r
- else if ( dist < 56 )\r
- dist = 56;\r
-\r
- if ( axis->width_count > 0 )\r
- {\r
- FT_Pos delta;\r
-\r
-\r
- /* compare to standard width */\r
- if ( axis->width_count > 0 )\r
- {\r
- delta = dist - axis->widths[0].cur;\r
-\r
- if ( delta < 0 )\r
- delta = -delta;\r
-\r
- if ( delta < 40 )\r
- {\r
- dist = axis->widths[0].cur;\r
- if ( dist < 48 )\r
- dist = 48;\r
-\r
- goto Done_Width;\r
- }\r
- }\r
-\r
- if ( dist < 3 * 64 )\r
- {\r
- delta = dist & 63;\r
- dist &= -64;\r
-\r
- if ( delta < 10 )\r
- dist += delta;\r
-\r
- else if ( delta < 32 )\r
- dist += 10;\r
-\r
- else if ( delta < 54 )\r
- dist += 54;\r
-\r
- else\r
- dist += delta;\r
- }\r
- else\r
- dist = ( dist + 32 ) & ~63;\r
- }\r
- }\r
- else\r
- {\r
- /* strong hinting process: snap the stem width to integer pixels */\r
- FT_Pos org_dist = dist;\r
-\r
-\r
- dist = af_latin_snap_width( axis->widths, axis->width_count, dist );\r
-\r
- if ( vertical )\r
- {\r
- /* in the case of vertical hinting, always round */\r
- /* the stem heights to integer pixels */\r
-\r
- if ( dist >= 64 )\r
- dist = ( dist + 16 ) & ~63;\r
- else\r
- dist = 64;\r
- }\r
- else\r
- {\r
- if ( AF_LATIN_HINTS_DO_MONO( hints ) )\r
- {\r
- /* monochrome horizontal hinting: snap widths to integer pixels */\r
- /* with a different threshold */\r
-\r
- if ( dist < 64 )\r
- dist = 64;\r
- else\r
- dist = ( dist + 32 ) & ~63;\r
- }\r
- else\r
- {\r
- /* for horizontal anti-aliased hinting, we adopt a more subtle */\r
- /* approach: we strengthen small stems, round stems whose size */\r
- /* is between 1 and 2 pixels to an integer, otherwise nothing */\r
-\r
- if ( dist < 48 )\r
- dist = ( dist + 64 ) >> 1;\r
-\r
- else if ( dist < 128 )\r
- {\r
- /* We only round to an integer width if the corresponding */\r
- /* distortion is less than 1/4 pixel. Otherwise this */\r
- /* makes everything worse since the diagonals, which are */\r
- /* not hinted, appear a lot bolder or thinner than the */\r
- /* vertical stems. */\r
-\r
- FT_Int delta;\r
-\r
-\r
- dist = ( dist + 22 ) & ~63;\r
- delta = dist - org_dist;\r
- if ( delta < 0 )\r
- delta = -delta;\r
-\r
- if (delta >= 16)\r
- {\r
- dist = org_dist;\r
- if ( dist < 48 )\r
- dist = ( dist + 64 ) >> 1;\r
- }\r
- }\r
- else\r
- /* round otherwise to prevent color fringes in LCD mode */\r
- dist = ( dist + 32 ) & ~63;\r
- }\r
- }\r
- }\r
-\r
- Done_Width:\r
- if ( sign )\r
- dist = -dist;\r
-\r
- return dist;\r
- }\r
-\r
-\r
- /* align one stem edge relative to the previous stem edge */\r
-\r
- static void\r
- af_latin_align_linked_edge( AF_GlyphHints hints,\r
- AF_Dimension dim,\r
- AF_Edge base_edge,\r
- AF_Edge stem_edge )\r
- {\r
- FT_Pos dist = stem_edge->opos - base_edge->opos;\r
-\r
- FT_Pos fitted_width = af_latin_compute_stem_width(\r
- hints, dim, dist,\r
- (AF_Edge_Flags)base_edge->flags,\r
- (AF_Edge_Flags)stem_edge->flags );\r
-\r
-\r
- stem_edge->pos = base_edge->pos + fitted_width;\r
-\r
- AF_LOG(( "LINK: edge %d (opos=%.2f) linked to (%.2f), "\r
- "dist was %.2f, now %.2f\n",\r
- stem_edge-hints->axis[dim].edges, stem_edge->opos / 64.0,\r
- stem_edge->pos / 64.0, dist / 64.0, fitted_width / 64.0 ));\r
- }\r
-\r
-\r
- static void\r
- af_latin_align_serif_edge( AF_GlyphHints hints,\r
- AF_Edge base,\r
- AF_Edge serif )\r
- {\r
- FT_UNUSED( hints );\r
-\r
- serif->pos = base->pos + (serif->opos - base->opos);\r
- }\r
-\r
-\r
- /*************************************************************************/\r
- /*************************************************************************/\r
- /*************************************************************************/\r
- /**** ****/\r
- /**** E D G E H I N T I N G ****/\r
- /**** ****/\r
- /*************************************************************************/\r
- /*************************************************************************/\r
- /*************************************************************************/\r
-\r
-\r
- FT_LOCAL_DEF( void )\r
- af_latin_hint_edges( AF_GlyphHints hints,\r
- AF_Dimension dim )\r
- {\r
- AF_AxisHints axis = &hints->axis[dim];\r
- AF_Edge edges = axis->edges;\r
- AF_Edge edge_limit = edges + axis->num_edges;\r
- FT_Int n_edges;\r
- AF_Edge edge;\r
- AF_Edge anchor = 0;\r
- FT_Int has_serifs = 0;\r
-\r
-\r
- /* we begin by aligning all stems relative to the blue zone */\r
- /* if needed -- that's only for horizontal edges */\r
-\r
- if ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_BLUES( hints ) )\r
- {\r
- for ( edge = edges; edge < edge_limit; edge++ )\r
- {\r
- AF_Width blue;\r
- AF_Edge edge1, edge2;\r
-\r
-\r
- if ( edge->flags & AF_EDGE_DONE )\r
- continue;\r
-\r
- blue = edge->blue_edge;\r
- edge1 = NULL;\r
- edge2 = edge->link;\r
-\r
- if ( blue )\r
- {\r
- edge1 = edge;\r
- }\r
- else if ( edge2 && edge2->blue_edge )\r
- {\r
- blue = edge2->blue_edge;\r
- edge1 = edge2;\r
- edge2 = edge;\r
- }\r
-\r
- if ( !edge1 )\r
- continue;\r
-\r
- AF_LOG(( "BLUE: edge %d (opos=%.2f) snapped to (%.2f), "\r
- "was (%.2f)\n",\r
- edge1-edges, edge1->opos / 64.0, blue->fit / 64.0,\r
- edge1->pos / 64.0 ));\r
-\r
- edge1->pos = blue->fit;\r
- edge1->flags |= AF_EDGE_DONE;\r
-\r
- if ( edge2 && !edge2->blue_edge )\r
- {\r
- af_latin_align_linked_edge( hints, dim, edge1, edge2 );\r
- edge2->flags |= AF_EDGE_DONE;\r
- }\r
-\r
- if ( !anchor )\r
- anchor = edge;\r
- }\r
- }\r
-\r
- /* now we will align all stem edges, trying to maintain the */\r
- /* relative order of stems in the glyph */\r
- for ( edge = edges; edge < edge_limit; edge++ )\r
- {\r
- AF_Edge edge2;\r
-\r
-\r
- if ( edge->flags & AF_EDGE_DONE )\r
- continue;\r
-\r
- /* skip all non-stem edges */\r
- edge2 = edge->link;\r
- if ( !edge2 )\r
- {\r
- has_serifs++;\r
- continue;\r
- }\r
-\r
- /* now align the stem */\r
-\r
- /* this should not happen, but it's better to be safe */\r
- if ( edge2->blue_edge )\r
- {\r
- AF_LOG(( "ASSERTION FAILED for edge %d\n", edge2-edges ));\r
-\r
- af_latin_align_linked_edge( hints, dim, edge2, edge );\r
- edge->flags |= AF_EDGE_DONE;\r
- continue;\r
- }\r
-\r
- if ( !anchor )\r
- {\r
- FT_Pos org_len, org_center, cur_len;\r
- FT_Pos cur_pos1, error1, error2, u_off, d_off;\r
-\r
-\r
- org_len = edge2->opos - edge->opos;\r
- cur_len = af_latin_compute_stem_width(\r
- hints, dim, org_len,\r
- (AF_Edge_Flags)edge->flags,\r
- (AF_Edge_Flags)edge2->flags );\r
- if ( cur_len <= 64 )\r
- u_off = d_off = 32;\r
- else\r
- {\r
- u_off = 38;\r
- d_off = 26;\r
- }\r
-\r
- if ( cur_len < 96 )\r
- {\r
- org_center = edge->opos + ( org_len >> 1 );\r
-\r
- cur_pos1 = FT_PIX_ROUND( org_center );\r
-\r
- error1 = org_center - ( cur_pos1 - u_off );\r
- if ( error1 < 0 )\r
- error1 = -error1;\r
-\r
- error2 = org_center - ( cur_pos1 + d_off );\r
- if ( error2 < 0 )\r
- error2 = -error2;\r
-\r
- if ( error1 < error2 )\r
- cur_pos1 -= u_off;\r
- else\r
- cur_pos1 += d_off;\r
-\r
- edge->pos = cur_pos1 - cur_len / 2;\r
- edge2->pos = edge->pos + cur_len;\r
- }\r
- else\r
- edge->pos = FT_PIX_ROUND( edge->opos );\r
-\r
- AF_LOG(( "ANCHOR: edge %d (opos=%.2f) and %d (opos=%.2f) "\r
- "snapped to (%.2f) (%.2f)\n",\r
- edge-edges, edge->opos / 64.0,\r
- edge2-edges, edge2->opos / 64.0,\r
- edge->pos / 64.0, edge2->pos / 64.0 ));\r
- anchor = edge;\r
-\r
- edge->flags |= AF_EDGE_DONE;\r
-\r
- af_latin_align_linked_edge( hints, dim, edge, edge2 );\r
- }\r
- else\r
- {\r
- FT_Pos org_pos, org_len, org_center, cur_len;\r
- FT_Pos cur_pos1, cur_pos2, delta1, delta2;\r
-\r
-\r
- org_pos = anchor->pos + ( edge->opos - anchor->opos );\r
- org_len = edge2->opos - edge->opos;\r
- org_center = org_pos + ( org_len >> 1 );\r
-\r
- cur_len = af_latin_compute_stem_width(\r
- hints, dim, org_len,\r
- (AF_Edge_Flags)edge->flags,\r
- (AF_Edge_Flags)edge2->flags );\r
-\r
- if ( edge2->flags & AF_EDGE_DONE )\r
- edge->pos = edge2->pos - cur_len;\r
-\r
- else if ( cur_len < 96 )\r
- {\r
- FT_Pos u_off, d_off;\r
-\r
-\r
- cur_pos1 = FT_PIX_ROUND( org_center );\r
-\r
- if (cur_len <= 64 )\r
- u_off = d_off = 32;\r
- else\r
- {\r
- u_off = 38;\r
- d_off = 26;\r
- }\r
-\r
- delta1 = org_center - ( cur_pos1 - u_off );\r
- if ( delta1 < 0 )\r
- delta1 = -delta1;\r
-\r
- delta2 = org_center - ( cur_pos1 + d_off );\r
- if ( delta2 < 0 )\r
- delta2 = -delta2;\r
-\r
- if ( delta1 < delta2 )\r
- cur_pos1 -= u_off;\r
- else\r
- cur_pos1 += d_off;\r
-\r
- edge->pos = cur_pos1 - cur_len / 2;\r
- edge2->pos = cur_pos1 + cur_len / 2;\r
-\r
- AF_LOG(( "STEM: %d (opos=%.2f) to %d (opos=%.2f) "\r
- "snapped to (%.2f) and (%.2f)\n",\r
- edge-edges, edge->opos / 64.0,\r
- edge2-edges, edge2->opos / 64.0,\r
- edge->pos / 64.0, edge2->pos / 64.0 ));\r
- }\r
- else\r
- {\r
- org_pos = anchor->pos + ( edge->opos - anchor->opos );\r
- org_len = edge2->opos - edge->opos;\r
- org_center = org_pos + ( org_len >> 1 );\r
-\r
- cur_len = af_latin_compute_stem_width(\r
- hints, dim, org_len,\r
- (AF_Edge_Flags)edge->flags,\r
- (AF_Edge_Flags)edge2->flags );\r
-\r
- cur_pos1 = FT_PIX_ROUND( org_pos );\r
- delta1 = cur_pos1 + ( cur_len >> 1 ) - org_center;\r
- if ( delta1 < 0 )\r
- delta1 = -delta1;\r
-\r
- cur_pos2 = FT_PIX_ROUND( org_pos + org_len ) - cur_len;\r
- delta2 = cur_pos2 + ( cur_len >> 1 ) - org_center;\r
- if ( delta2 < 0 )\r
- delta2 = -delta2;\r
-\r
- edge->pos = ( delta1 < delta2 ) ? cur_pos1 : cur_pos2;\r
- edge2->pos = edge->pos + cur_len;\r
-\r
- AF_LOG(( "STEM: %d (opos=%.2f) to %d (opos=%.2f) "\r
- "snapped to (%.2f) and (%.2f)\n",\r
- edge-edges, edge->opos / 64.0,\r
- edge2-edges, edge2->opos / 64.0,\r
- edge->pos / 64.0, edge2->pos / 64.0 ));\r
- }\r
-\r
- edge->flags |= AF_EDGE_DONE;\r
- edge2->flags |= AF_EDGE_DONE;\r
-\r
- if ( edge > edges && edge->pos < edge[-1].pos )\r
- {\r
- AF_LOG(( "BOUND: %d (pos=%.2f) to (%.2f)\n",\r
- edge-edges, edge->pos / 64.0, edge[-1].pos / 64.0 ));\r
- edge->pos = edge[-1].pos;\r
- }\r
- }\r
- }\r
-\r
- /* make sure that lowercase m's maintain their symmetry */\r
-\r
- /* In general, lowercase m's have six vertical edges if they are sans */\r
- /* serif, or twelve if they are with serifs. This implementation is */\r
- /* based on that assumption, and seems to work very well with most */\r
- /* faces. However, if for a certain face this assumption is not */\r
- /* true, the m is just rendered like before. In addition, any stem */\r
- /* correction will only be applied to symmetrical glyphs (even if the */\r
- /* glyph is not an m), so the potential for unwanted distortion is */\r
- /* relatively low. */\r
-\r
- /* We don't handle horizontal edges since we can't easily assure that */\r
- /* the third (lowest) stem aligns with the base line; it might end up */\r
- /* one pixel higher or lower. */\r
-\r
- n_edges = edge_limit - edges;\r
- if ( dim == AF_DIMENSION_HORZ && ( n_edges == 6 || n_edges == 12 ) )\r
- {\r
- AF_Edge edge1, edge2, edge3;\r
- FT_Pos dist1, dist2, span, delta;\r
-\r
-\r
- if ( n_edges == 6 )\r
- {\r
- edge1 = edges;\r
- edge2 = edges + 2;\r
- edge3 = edges + 4;\r
- }\r
- else\r
- {\r
- edge1 = edges + 1;\r
- edge2 = edges + 5;\r
- edge3 = edges + 9;\r
- }\r
-\r
- dist1 = edge2->opos - edge1->opos;\r
- dist2 = edge3->opos - edge2->opos;\r
-\r
- span = dist1 - dist2;\r
- if ( span < 0 )\r
- span = -span;\r
-\r
- if ( span < 8 )\r
- {\r
- delta = edge3->pos - ( 2 * edge2->pos - edge1->pos );\r
- edge3->pos -= delta;\r
- if ( edge3->link )\r
- edge3->link->pos -= delta;\r
-\r
- /* move the serifs along with the stem */\r
- if ( n_edges == 12 )\r
- {\r
- ( edges + 8 )->pos -= delta;\r
- ( edges + 11 )->pos -= delta;\r
- }\r
-\r
- edge3->flags |= AF_EDGE_DONE;\r
- if ( edge3->link )\r
- edge3->link->flags |= AF_EDGE_DONE;\r
- }\r
- }\r
-\r
- if ( has_serifs || !anchor )\r
- {\r
- /*\r
- * now hint the remaining edges (serifs and single) in order\r
- * to complete our processing\r
- */\r
- for ( edge = edges; edge < edge_limit; edge++ )\r
- {\r
- FT_Pos delta;\r
-\r
-\r
- if ( edge->flags & AF_EDGE_DONE )\r
- continue;\r
-\r
- delta = 1000;\r
-\r
- if ( edge->serif )\r
- {\r
- delta = edge->serif->opos - edge->opos;\r
- if ( delta < 0 )\r
- delta = -delta;\r
- }\r
-\r
- if ( delta < 64 + 16 )\r
- {\r
- af_latin_align_serif_edge( hints, edge->serif, edge );\r
- AF_LOG(( "SERIF: edge %d (opos=%.2f) serif to %d (opos=%.2f) "\r
- "aligned to (%.2f)\n",\r
- edge-edges, edge->opos / 64.0,\r
- edge->serif - edges, edge->serif->opos / 64.0,\r
- edge->pos / 64.0 ));\r
- }\r
- else if ( !anchor )\r
- {\r
- AF_LOG(( "SERIF_ANCHOR: edge %d (opos=%.2f) snapped to (%.2f)\n",\r
- edge-edges, edge->opos / 64.0, edge->pos / 64.0 ));\r
- edge->pos = FT_PIX_ROUND( edge->opos );\r
- anchor = edge;\r
- }\r
- else\r
- {\r
- AF_Edge before, after;\r
-\r
-\r
- for ( before = edge - 1; before >= edges; before-- )\r
- if ( before->flags & AF_EDGE_DONE )\r
- break;\r
-\r
- for ( after = edge + 1; after < edge_limit; after++ )\r
- if ( after->flags & AF_EDGE_DONE )\r
- break;\r
-\r
- if ( before >= edges && before < edge &&\r
- after < edge_limit && after > edge )\r
- {\r
- edge->pos = before->pos +\r
- FT_MulDiv( edge->opos - before->opos,\r
- after->pos - before->pos,\r
- after->opos - before->opos );\r
- AF_LOG(( "SERIF_LINK1: edge %d (opos=%.2f) snapped to (%.2f) "\r
- "from %d (opos=%.2f)\n",\r
- edge-edges, edge->opos / 64.0,\r
- edge->pos / 64.0, before - edges,\r
- before->opos / 64.0 ));\r
- }\r
- else\r
- {\r
- edge->pos = anchor->pos +\r
- ( ( edge->opos - anchor->opos + 16 ) & ~31 );\r
- AF_LOG(( "SERIF_LINK2: edge %d (opos=%.2f) snapped to (%.2f)\n",\r
- edge-edges, edge->opos / 64.0, edge->pos / 64.0 ));\r
- }\r
- }\r
-\r
- edge->flags |= AF_EDGE_DONE;\r
-\r
- if ( edge > edges && edge->pos < edge[-1].pos )\r
- edge->pos = edge[-1].pos;\r
-\r
- if ( edge + 1 < edge_limit &&\r
- edge[1].flags & AF_EDGE_DONE &&\r
- edge->pos > edge[1].pos )\r
- edge->pos = edge[1].pos;\r
- }\r
- }\r
- }\r
-\r
-\r
- static FT_Error\r
- af_latin_hints_apply( AF_GlyphHints hints,\r
- FT_Outline* outline,\r
- AF_LatinMetrics metrics )\r
- {\r
- FT_Error error;\r
- int dim;\r
-\r
-\r
- error = af_glyph_hints_reload( hints, outline, 1 );\r
- if ( error )\r
- goto Exit;\r
-\r
- /* analyze glyph outline */\r
-#ifdef AF_USE_WARPER\r
- if ( metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT ||\r
- AF_HINTS_DO_HORIZONTAL( hints ) )\r
-#else\r
- if ( AF_HINTS_DO_HORIZONTAL( hints ) )\r
-#endif\r
- {\r
- error = af_latin_hints_detect_features( hints, AF_DIMENSION_HORZ );\r
- if ( error )\r
- goto Exit;\r
- }\r
-\r
- if ( AF_HINTS_DO_VERTICAL( hints ) )\r
- {\r
- error = af_latin_hints_detect_features( hints, AF_DIMENSION_VERT );\r
- if ( error )\r
- goto Exit;\r
-\r
- af_latin_hints_compute_blue_edges( hints, metrics );\r
- }\r
-\r
- /* grid-fit the outline */\r
- for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )\r
- {\r
-#ifdef AF_USE_WARPER\r
- if ( ( dim == AF_DIMENSION_HORZ &&\r
- metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT ) )\r
- {\r
- AF_WarperRec warper;\r
- FT_Fixed scale;\r
- FT_Pos delta;\r
-\r
-\r
- af_warper_compute( &warper, hints, dim, &scale, &delta );\r
- af_glyph_hints_scale_dim( hints, dim, scale, delta );\r
- continue;\r
- }\r
-#endif\r
-\r
- if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) ||\r
- ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) )\r
- {\r
- af_latin_hint_edges( hints, (AF_Dimension)dim );\r
- af_glyph_hints_align_edge_points( hints, (AF_Dimension)dim );\r
- af_glyph_hints_align_strong_points( hints, (AF_Dimension)dim );\r
- af_glyph_hints_align_weak_points( hints, (AF_Dimension)dim );\r
- }\r
- }\r
- af_glyph_hints_save( hints, outline );\r
-\r
- Exit:\r
- return error;\r
- }\r
-\r
-\r
- /*************************************************************************/\r
- /*************************************************************************/\r
- /***** *****/\r
- /***** L A T I N S C R I P T C L A S S *****/\r
- /***** *****/\r
- /*************************************************************************/\r
- /*************************************************************************/\r
-\r
-\r
- /* XXX: this should probably fine tuned to differentiate better between */\r
- /* scripts... */\r
-\r
- static const AF_Script_UniRangeRec af_latin_uniranges[] =\r
- {\r
- { 0x0020, 0x007F }, /* Basic Latin (no control characters) */\r
- { 0x00A0, 0x00FF }, /* Latin-1 Supplement (no control characters) */\r
- { 0x0100, 0x017F }, /* Latin Extended-A */\r
- { 0x0180, 0x024F }, /* Latin Extended-B */\r
- { 0x0250, 0x02AF }, /* IPA Extensions */\r
- { 0x02B0, 0x02FF }, /* Spacing Modifier Letters */\r
- { 0x0300, 0x036F }, /* Combining Diacritical Marks */\r
- { 0x0370, 0x03FF }, /* Greek and Coptic */\r
- { 0x0400, 0x04FF }, /* Cyrillic */\r
- { 0x0500, 0x052F }, /* Cyrillic Supplement */\r
- { 0x1D00, 0x1D7F }, /* Phonetic Extensions */\r
- { 0x1D80, 0x1DBF }, /* Phonetic Extensions Supplement */\r
- { 0x1DC0, 0x1DFF }, /* Combining Diacritical Marks Supplement */\r
- { 0x1E00, 0x1EFF }, /* Latin Extended Additional */\r
- { 0x1F00, 0x1FFF }, /* Greek Extended */\r
- { 0x2000, 0x206F }, /* General Punctuation */\r
- { 0x2070, 0x209F }, /* Superscripts and Subscripts */\r
- { 0x20A0, 0x20CF }, /* Currency Symbols */\r
- { 0x2150, 0x218F }, /* Number Forms */\r
- { 0x2460, 0x24FF }, /* Enclosed Alphanumerics */\r
- { 0 , 0 }\r
- };\r
-\r
-\r
- FT_CALLBACK_TABLE_DEF const AF_ScriptClassRec\r
- af_latin_script_class =\r
- {\r
- AF_SCRIPT_LATIN,\r
- af_latin_uniranges,\r
-\r
- sizeof( AF_LatinMetricsRec ),\r
-\r
- (AF_Script_InitMetricsFunc) af_latin_metrics_init,\r
- (AF_Script_ScaleMetricsFunc)af_latin_metrics_scale,\r
- (AF_Script_DoneMetricsFunc) NULL,\r
-\r
- (AF_Script_InitHintsFunc) af_latin_hints_init,\r
- (AF_Script_ApplyHintsFunc) af_latin_hints_apply\r
- };\r
-\r
-\r
-/* END */\r
+/***************************************************************************/
+/* */
+/* aflatin.c */
+/* */
+/* Auto-fitter hinting routines for latin script (body). */
+/* */
+/* Copyright 2003, 2004, 2005, 2006, 2007 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. */
+/* */
+/***************************************************************************/
+
+
+#include "aflatin.h"
+#include "aferrors.h"
+
+
+#ifdef AF_USE_WARPER
+#include "afwarp.h"
+#endif
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** L A T I N G L O B A L M E T R I C S *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+
+ FT_LOCAL_DEF( void )
+ af_latin_metrics_init_widths( AF_LatinMetrics metrics,
+ FT_Face face,
+ FT_ULong charcode )
+ {
+ /* scan the array of segments in each direction */
+ AF_GlyphHintsRec hints[1];
+
+
+ af_glyph_hints_init( hints, face->memory );
+
+ metrics->axis[AF_DIMENSION_HORZ].width_count = 0;
+ metrics->axis[AF_DIMENSION_VERT].width_count = 0;
+
+ {
+ FT_Error error;
+ FT_UInt glyph_index;
+ int dim;
+ AF_LatinMetricsRec dummy[1];
+ AF_Scaler scaler = &dummy->root.scaler;
+
+
+ glyph_index = FT_Get_Char_Index( face, charcode );
+ if ( glyph_index == 0 )
+ goto Exit;
+
+ error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
+ if ( error || face->glyph->outline.n_points <= 0 )
+ goto Exit;
+
+ FT_ZERO( dummy );
+
+ dummy->units_per_em = metrics->units_per_em;
+ scaler->x_scale = scaler->y_scale = 0x10000L;
+ scaler->x_delta = 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, 0 );
+ if ( error )
+ goto Exit;
+
+ for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
+ {
+ AF_LatinAxis 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_LATIN_MAX_WIDTHS )
+ axis->widths[ num_widths++ ].org = dist;
+ }
+ }
+
+ af_sort_widths( num_widths, axis->widths );
+ axis->width_count = num_widths;
+ }
+
+ Exit:
+ for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
+ {
+ AF_LatinAxis 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_LATIN_MAX_TEST_CHARACTERS 12
+
+
+ static const char* const af_latin_blue_chars[AF_LATIN_MAX_BLUES] =
+ {
+ "THEZOCQS",
+ "HEZLOCUS",
+ "fijkdbh",
+ "xzroesc",
+ "xzroesc",
+ "pqgjy"
+ };
+
+
+ static void
+ af_latin_metrics_init_blues( AF_LatinMetrics metrics,
+ FT_Face face )
+ {
+ FT_Pos flats [AF_LATIN_MAX_TEST_CHARACTERS];
+ FT_Pos rounds[AF_LATIN_MAX_TEST_CHARACTERS];
+ FT_Int num_flats;
+ FT_Int num_rounds;
+ FT_Int bb;
+ AF_LatinBlue blue;
+ FT_Error error;
+ AF_LatinAxis axis = &metrics->axis[AF_DIMENSION_VERT];
+ FT_GlyphSlot glyph = face->glyph;
+
+
+ /* we compute the blues simply by loading each character from the */
+ /* 'af_latin_blue_chars[blues]' string, then compute its top-most or */
+ /* bottom-most points (depending on `AF_IS_TOP_BLUE') */
+
+ AF_LOG(( "blue zones computation\n" ));
+ AF_LOG(( "------------------------------------------------\n" ));
+
+ for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ )
+ {
+ const char* p = af_latin_blue_chars[bb];
+ const char* limit = p + AF_LATIN_MAX_TEST_CHARACTERS;
+ FT_Pos* blue_ref;
+ FT_Pos* blue_shoot;
+
+
+ AF_LOG(( "blue %3d: ", bb ));
+
+ num_flats = 0;
+ num_rounds = 0;
+
+ for ( ; p < limit && *p; p++ )
+ {
+ FT_UInt glyph_index;
+ FT_Int best_point, best_y, best_first, best_last;
+ FT_Vector* points;
+ FT_Bool round = 0;
+
+
+ AF_LOG(( "'%c'", *p ));
+
+ /* load the character in the face -- skip unknown or empty ones */
+ glyph_index = FT_Get_Char_Index( face, (FT_UInt)*p );
+ if ( glyph_index == 0 )
+ continue;
+
+ error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
+ if ( error || glyph->outline.n_points <= 0 )
+ continue;
+
+ /* now compute min or max point indices and coordinates */
+ points = glyph->outline.points;
+ best_point = -1;
+ best_y = 0; /* make compiler happy */
+ best_first = 0; /* ditto */
+ best_last = 0; /* ditto */
+
+ {
+ FT_Int nn;
+ FT_Int first = 0;
+ FT_Int last = -1;
+
+
+ for ( nn = 0; nn < glyph->outline.n_contours; first = last+1, nn++ )
+ {
+ FT_Int old_best_point = best_point;
+ FT_Int pp;
+
+
+ last = glyph->outline.contours[nn];
+
+ /* Avoid single-point contours since they are never rasterized. */
+ /* In some fonts, they correspond to mark attachment points */
+ /* which are way outside of the glyph's real outline. */
+ if ( last <= first )
+ continue;
+
+ if ( AF_LATIN_IS_TOP_BLUE( bb ) )
+ {
+ for ( pp = first; pp <= last; pp++ )
+ if ( best_point < 0 || points[pp].y > best_y )
+ {
+ best_point = pp;
+ best_y = points[pp].y;
+ }
+ }
+ else
+ {
+ for ( pp = first; pp <= last; pp++ )
+ if ( best_point < 0 || points[pp].y < best_y )
+ {
+ best_point = pp;
+ best_y = points[pp].y;
+ }
+ }
+
+ if ( best_point != old_best_point )
+ {
+ best_first = first;
+ best_last = last;
+ }
+ }
+ AF_LOG(( "%5d", best_y ));
+ }
+
+ /* now check whether the point belongs to a straight or round */
+ /* segment; we first need to find in which contour the extremum */
+ /* lies, then inspect its previous and next points */
+ if ( best_point >= 0 )
+ {
+ FT_Int prev, next;
+ FT_Pos dist;
+
+
+ /* now look for the previous and next points that are not on the */
+ /* same Y coordinate. Threshold the `closeness'... */
+ prev = best_point;
+ next = prev;
+
+ do
+ {
+ if ( prev > best_first )
+ prev--;
+ else
+ prev = best_last;
+
+ dist = points[prev].y - best_y;
+ if ( dist < -5 || dist > 5 )
+ break;
+
+ } while ( prev != best_point );
+
+ do
+ {
+ if ( next < best_last )
+ next++;
+ else
+ next = best_first;
+
+ dist = points[next].y - best_y;
+ if ( dist < -5 || dist > 5 )
+ break;
+
+ } while ( next != best_point );
+
+ /* now, set the `round' flag depending on the segment's kind */
+ round = FT_BOOL(
+ FT_CURVE_TAG( glyph->outline.tags[prev] ) != FT_CURVE_TAG_ON ||
+ FT_CURVE_TAG( glyph->outline.tags[next] ) != FT_CURVE_TAG_ON );
+
+ AF_LOG(( "%c ", round ? 'r' : 'f' ));
+ }
+
+ if ( round )
+ rounds[num_rounds++] = best_y;
+ else
+ flats[num_flats++] = best_y;
+ }
+
+ AF_LOG(( "\n" ));
+
+ if ( num_flats == 0 && num_rounds == 0 )
+ {
+ /*
+ * we couldn't find a single glyph to compute this blue zone,
+ * we will simply ignore it then
+ */
+ AF_LOG(( "empty!\n" ));
+ continue;
+ }
+
+ /* we have computed the contents of the `rounds' 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_rounds, rounds );
+ 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 = rounds[num_rounds / 2];
+ }
+ else if ( num_rounds == 0 )
+ {
+ *blue_ref =
+ *blue_shoot = flats[num_flats / 2];
+ }
+ else
+ {
+ *blue_ref = flats[num_flats / 2];
+ *blue_shoot = rounds[num_rounds / 2];
+ }
+
+ /* there are sometimes problems: if the overshoot position of top */
+ /* zones is under its reference position, or the opposite for bottom */
+ /* zones. We must thus check everything there and correct the errors */
+ if ( *blue_shoot != *blue_ref )
+ {
+ FT_Pos ref = *blue_ref;
+ FT_Pos shoot = *blue_shoot;
+ FT_Bool over_ref = FT_BOOL( shoot > ref );
+
+
+ if ( AF_LATIN_IS_TOP_BLUE( bb ) ^ over_ref )
+ *blue_shoot = *blue_ref = ( shoot + ref ) / 2;
+ }
+
+ blue->flags = 0;
+ if ( AF_LATIN_IS_TOP_BLUE( bb ) )
+ blue->flags |= AF_LATIN_BLUE_TOP;
+
+ /*
+ * The following flags is used later to adjust the y and x scales
+ * in order to optimize the pixel grid alignment of the top of small
+ * letters.
+ */
+ if ( bb == AF_LATIN_BLUE_SMALL_TOP )
+ blue->flags |= AF_LATIN_BLUE_ADJUSTMENT;
+
+ AF_LOG(( "-- ref = %ld, shoot = %ld\n", *blue_ref, *blue_shoot ));
+ }
+
+ return;
+ }
+
+
+ FT_LOCAL_DEF( FT_Error )
+ af_latin_metrics_init( AF_LatinMetrics metrics,
+ FT_Face face )
+ {
+ FT_Error error = AF_Err_Ok;
+ FT_CharMap oldmap = face->charmap;
+ FT_UInt ee;
+
+ static const FT_Encoding latin_encodings[] =
+ {
+ FT_ENCODING_UNICODE,
+ FT_ENCODING_APPLE_ROMAN,
+ FT_ENCODING_ADOBE_STANDARD,
+ FT_ENCODING_ADOBE_LATIN_1,
+ FT_ENCODING_NONE /* end of list */
+ };
+
+
+ metrics->units_per_em = face->units_per_EM;
+
+ /* do we have a latin charmap in there? */
+ for ( ee = 0; latin_encodings[ee] != FT_ENCODING_NONE; ee++ )
+ {
+ error = FT_Select_Charmap( face, latin_encodings[ee] );
+ if ( !error )
+ break;
+ }
+
+ if ( !error )
+ {
+ /* For now, compute the standard width and height from the `o'. */
+ af_latin_metrics_init_widths( metrics, face, 'o' );
+ af_latin_metrics_init_blues( metrics, face );
+ }
+
+ FT_Set_Charmap( face, oldmap );
+ return AF_Err_Ok;
+ }
+
+
+ static void
+ af_latin_metrics_scale_dim( AF_LatinMetrics metrics,
+ AF_Scaler scaler,
+ AF_Dimension dim )
+ {
+ FT_Fixed scale;
+ FT_Pos delta;
+ AF_LatinAxis 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;
+
+ /*
+ * correct X and Y scale to optimize the alignment of the top of small
+ * letters to the pixel grid
+ */
+ {
+ AF_LatinAxis Axis = &metrics->axis[AF_DIMENSION_VERT];
+ AF_LatinBlue blue = NULL;
+
+
+ for ( nn = 0; nn < Axis->blue_count; nn++ )
+ {
+ if ( Axis->blues[nn].flags & AF_LATIN_BLUE_ADJUSTMENT )
+ {
+ blue = &Axis->blues[nn];
+ break;
+ }
+ }
+
+ if ( blue )
+ {
+ FT_Pos scaled = FT_MulFix( blue->shoot.org, scaler->y_scale );
+ FT_Pos fitted = ( scaled + 40 ) & ~63;
+
+
+ if ( scaled != fitted )
+ {
+#if 0
+ if ( dim == AF_DIMENSION_HORZ )
+ {
+ if ( fitted < scaled )
+ scale -= scale / 50; /* scale *= 0.98 */
+ }
+ else
+#endif
+ if ( dim == AF_DIMENSION_VERT )
+ {
+ scale = FT_MulDiv( scale, fitted, scaled );
+ }
+ }
+ }
+ }
+
+ axis->scale = scale;
+ axis->delta = delta;
+
+ if ( dim == AF_DIMENSION_HORZ )
+ {
+ metrics->root.scaler.x_scale = scale;
+ metrics->root.scaler.x_delta = delta;
+ }
+ else
+ {
+ metrics->root.scaler.y_scale = scale;
+ metrics->root.scaler.y_delta = delta;
+ }
+
+ /* scale the standard widths */
+ for ( nn = 0; nn < axis->width_count; nn++ )
+ {
+ AF_Width width = axis->widths + nn;
+
+
+ width->cur = FT_MulFix( width->org, scale );
+ width->fit = width->cur;
+ }
+
+ /* an extra-light axis corresponds to a standard width that is */
+ /* smaller than 0.75 pixels */
+ axis->extra_light =
+ (FT_Bool)( FT_MulFix( axis->standard_width, scale ) < 32 + 8 );
+
+ if ( dim == AF_DIMENSION_VERT )
+ {
+ /* scale the blue zones */
+ for ( nn = 0; nn < axis->blue_count; nn++ )
+ {
+ AF_LatinBlue 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_LATIN_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;
+
+
+ delta1 = blue->shoot.org - blue->ref.org;
+ delta2 = delta1;
+ if ( delta1 < 0 )
+ delta2 = -delta2;
+
+ delta2 = FT_MulFix( delta2, scale );
+
+ if ( delta2 < 32 )
+ delta2 = 0;
+ else if ( delta2 < 64 )
+ delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & ~31 );
+ else
+ delta2 = FT_PIX_ROUND( delta2 );
+
+ if ( delta1 < 0 )
+ delta2 = -delta2;
+
+ blue->ref.fit = FT_PIX_ROUND( blue->ref.cur );
+ blue->shoot.fit = blue->ref.fit + delta2;
+
+ blue->flags |= AF_LATIN_BLUE_ACTIVE;
+ }
+ }
+ }
+ }
+
+
+ FT_LOCAL_DEF( void )
+ af_latin_metrics_scale( AF_LatinMetrics metrics,
+ AF_Scaler scaler )
+ {
+ metrics->root.scaler.render_mode = scaler->render_mode;
+ metrics->root.scaler.face = scaler->face;
+
+ af_latin_metrics_scale_dim( metrics, scaler, AF_DIMENSION_HORZ );
+ af_latin_metrics_scale_dim( metrics, scaler, AF_DIMENSION_VERT );
+ }
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** L A T I N G L Y P H A N A L Y S I S *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+
+ FT_LOCAL_DEF( FT_Error )
+ af_latin_hints_compute_segments( AF_GlyphHints hints,
+ AF_Dimension dim )
+ {
+ AF_AxisHints axis = &hints->axis[dim];
+ FT_Memory memory = hints->memory;
+ FT_Error error = AF_Err_Ok;
+ AF_Segment segment = NULL;
+ AF_SegmentRec seg0;
+ AF_Point* contour = hints->contours;
+ AF_Point* contour_limit = contour + hints->num_contours;
+ AF_Direction major_dir, segment_dir;
+
+
+ FT_ZERO( &seg0 );
+ seg0.score = 32000;
+ seg0.flags = AF_EDGE_NORMAL;
+
+ major_dir = (AF_Direction)FT_ABS( axis->major_dir );
+ segment_dir = major_dir;
+
+ axis->num_segments = 0;
+
+ /* set up (u,v) in each point */
+ if ( dim == AF_DIMENSION_HORZ )
+ {
+ AF_Point point = hints->points;
+ AF_Point limit = point + hints->num_points;
+
+
+ for ( ; point < limit; point++ )
+ {
+ point->u = point->fx;
+ point->v = point->fy;
+ }
+ }
+ else
+ {
+ AF_Point point = hints->points;
+ AF_Point limit = point + hints->num_points;
+
+
+ for ( ; point < limit; point++ )
+ {
+ point->u = point->fy;
+ point->v = point->fx;
+ }
+ }
+
+ /* do each contour separately */
+ for ( ; contour < contour_limit; contour++ )
+ {
+ AF_Point point = contour[0];
+ AF_Point last = point->prev;
+ int on_edge = 0;
+ FT_Pos min_pos = 32000; /* minimum segment pos != min_coord */
+ FT_Pos max_pos = -32000; /* maximum segment pos != max_coord */
+ FT_Bool passed;
+
+
+ if ( point == last ) /* skip singletons -- just in case */
+ continue;
+
+ if ( FT_ABS( last->out_dir ) == major_dir &&
+ FT_ABS( point->out_dir ) == major_dir )
+ {
+ /* we are already on an edge, try to locate its start */
+ last = point;
+
+ for (;;)
+ {
+ point = point->prev;
+ if ( FT_ABS( point->out_dir ) != major_dir )
+ {
+ point = point->next;
+ break;
+ }
+ if ( point == last )
+ break;
+ }
+ }
+
+ last = point;
+ passed = 0;
+
+ for (;;)
+ {
+ FT_Pos u, v;
+
+
+ if ( on_edge )
+ {
+ u = point->u;
+ if ( u < min_pos )
+ min_pos = u;
+ if ( u > max_pos )
+ max_pos = u;
+
+ if ( point->out_dir != segment_dir || point == last )
+ {
+ /* we are just leaving an edge; record a new segment! */
+ segment->last = point;
+ segment->pos = (FT_Short)( ( min_pos + max_pos ) >> 1 );
+
+ /* a segment is round if either its first or last point */
+ /* is a control point */
+ if ( ( segment->first->flags | point->flags ) &
+ AF_FLAG_CONTROL )
+ segment->flags |= AF_EDGE_ROUND;
+
+ /* compute segment size */
+ min_pos = max_pos = point->v;
+
+ v = segment->first->v;
+ if ( v < min_pos )
+ min_pos = v;
+ if ( v > max_pos )
+ max_pos = v;
+
+ segment->min_coord = (FT_Short)min_pos;
+ segment->max_coord = (FT_Short)max_pos;
+ segment->height = (FT_Short)( segment->max_coord -
+ segment->min_coord );
+
+ on_edge = 0;
+ segment = NULL;
+ /* fallthrough */
+ }
+ }
+
+ /* now exit if we are at the start/end point */
+ if ( point == last )
+ {
+ if ( passed )
+ break;
+ passed = 1;
+ }
+
+ if ( !on_edge && FT_ABS( point->out_dir ) == major_dir )
+ {
+ /* this is the start of a new segment! */
+ segment_dir = (AF_Direction)point->out_dir;
+
+ /* clear all segment fields */
+ error = af_axis_hints_new_segment( axis, memory, &segment );
+ if ( error )
+ goto Exit;
+
+ segment[0] = seg0;
+ segment->dir = (FT_Char)segment_dir;
+ min_pos = max_pos = point->u;
+ segment->first = point;
+ segment->last = point;
+ segment->contour = contour;
+ on_edge = 1;
+ }
+
+ point = point->next;
+ }
+
+ } /* contours */
+
+
+ /* now slightly increase the height of segments when this makes */
+ /* sense -- this is used to better detect and ignore serifs */
+ {
+ AF_Segment segments = axis->segments;
+ AF_Segment segments_end = segments + axis->num_segments;
+
+
+ for ( segment = segments; segment < segments_end; segment++ )
+ {
+ AF_Point first = segment->first;
+ AF_Point last = segment->last;
+ FT_Pos first_v = first->v;
+ FT_Pos last_v = last->v;
+
+
+ if ( first == last )
+ continue;
+
+ if ( first_v < last_v )
+ {
+ AF_Point p;
+
+
+ p = first->prev;
+ if ( p->v < first_v )
+ segment->height = (FT_Short)( segment->height +
+ ( ( first_v - p->v ) >> 1 ) );
+
+ p = last->next;
+ if ( p->v > last_v )
+ segment->height = (FT_Short)( segment->height +
+ ( ( p->v - last_v ) >> 1 ) );
+ }
+ else
+ {
+ AF_Point p;
+
+
+ p = first->prev;
+ if ( p->v > first_v )
+ segment->height = (FT_Short)( segment->height +
+ ( ( p->v - first_v ) >> 1 ) );
+
+ p = last->next;
+ if ( p->v < last_v )
+ segment->height = (FT_Short)( segment->height +
+ ( ( last_v - p->v ) >> 1 ) );
+ }
+ }
+ }
+
+ Exit:
+ return error;
+ }
+
+
+ FT_LOCAL_DEF( void )
+ af_latin_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;
+ FT_Pos len_threshold, len_score;
+ AF_Segment seg1, seg2;
+
+
+ len_threshold = AF_LATIN_CONSTANT( hints->metrics, 8 );
+ if ( len_threshold == 0 )
+ len_threshold = 1;
+
+ len_score = AF_LATIN_CONSTANT( hints->metrics, 6000 );
+
+ /* now compare each segment to the others */
+ for ( seg1 = segments; seg1 < segment_limit; seg1++ )
+ {
+ /* the fake segments are introduced to hint the metrics -- */
+ /* we must never link them to anything */
+ if ( seg1->dir != axis->major_dir || seg1->first == seg1->last )
+ continue;
+
+ for ( seg2 = segments; seg2 < segment_limit; seg2++ )
+ if ( seg1->dir + seg2->dir == 0 && seg2->pos > seg1->pos )
+ {
+ FT_Pos pos1 = seg1->pos;
+ FT_Pos pos2 = seg2->pos;
+ FT_Pos dist = pos2 - pos1;
+
+
+ if ( dist < 0 )
+ dist = -dist;
+
+ {
+ FT_Pos min = seg1->min_coord;
+ FT_Pos max = seg1->max_coord;
+ FT_Pos len, score;
+
+
+ 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 )
+ {
+ score = dist + len_score / len;
+
+ if ( score < seg1->score )
+ {
+ seg1->score = score;
+ seg1->link = seg2;
+ }
+
+ if ( score < seg2->score )
+ {
+ seg2->score = score;
+ seg2->link = seg1;
+ }
+ }
+ }
+ }
+ }
+
+ /* now, compute the `serif' segments */
+ for ( seg1 = segments; seg1 < segment_limit; seg1++ )
+ {
+ seg2 = seg1->link;
+
+ if ( seg2 )
+ {
+ if ( seg2->link != seg1 )
+ {
+ seg1->link = 0;
+ seg1->serif = seg2->link;
+ }
+ }
+ }
+ }
+
+
+ FT_LOCAL_DEF( FT_Error )
+ af_latin_hints_compute_edges( AF_GlyphHints hints,
+ AF_Dimension dim )
+ {
+ AF_AxisHints axis = &hints->axis[dim];
+ FT_Error error = AF_Err_Ok;
+ FT_Memory memory = hints->memory;
+ AF_LatinAxis laxis = &((AF_LatinMetrics)hints->metrics)->axis[dim];
+
+ AF_Segment segments = axis->segments;
+ AF_Segment segment_limit = segments + axis->num_segments;
+ AF_Segment seg;
+
+ AF_Direction up_dir;
+ FT_Fixed scale;
+ FT_Pos edge_distance_threshold;
+ FT_Pos segment_length_threshold;
+
+
+ axis->num_edges = 0;
+
+ scale = ( dim == AF_DIMENSION_HORZ ) ? hints->x_scale
+ : hints->y_scale;
+
+ up_dir = ( dim == AF_DIMENSION_HORZ ) ? AF_DIR_UP
+ : AF_DIR_RIGHT;
+
+ /*
+ * We ignore all segments that are less than 1 pixels in length,
+ * to avoid many problems with serif fonts. We compute the
+ * corresponding threshold in font units.
+ */
+ if ( dim == AF_DIMENSION_HORZ )
+ segment_length_threshold = FT_DivFix( 64, hints->y_scale );
+ else
+ segment_length_threshold = 0;
+
+ /*********************************************************************/
+ /* */
+ /* We will 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 will be 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 = 64 / 4;
+
+ edge_distance_threshold = FT_DivFix( edge_distance_threshold,
+ scale );
+
+ for ( seg = segments; seg < segment_limit; seg++ )
+ {
+ AF_Edge found = 0;
+ FT_Int ee;
+
+
+ if ( seg->height < segment_length_threshold )
+ continue;
+
+ /* A special case for serif edges: If they are smaller than */
+ /* 1.5 pixels we ignore them. */
+ if ( seg->serif &&
+ 2 * seg->height < 3 * segment_length_threshold )
+ continue;
+
+ /* 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;
+
+
+ dist = seg->pos - edge->fpos;
+ if ( dist < 0 )
+ dist = -dist;
+
+ if ( dist < edge_distance_threshold && edge->dir == seg->dir )
+ {
+ found = edge;
+ break;
+ }
+ }
+
+ 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, 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->dir = seg->dir;
+ edge->opos = edge->pos = FT_MulFix( seg->pos, scale );
+ 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 will now compute each edge's properties according to */
+ /* segments found on its position. Basically, these are: */
+ /* */
+ /* - 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? */
+ FT_Pos ups = 0; /* number of upwards segments */
+ FT_Pos downs = 0; /* number of downwards 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 segment direction */
+ if ( seg->dir == up_dir )
+ ups += seg->max_coord-seg->min_coord;
+ else
+ downs += seg->max_coord-seg->min_coord;
+
+ /* check for links -- if seg->serif is set, then seg->link must */
+ /* be ignored */
+ is_serif = (FT_Bool)( seg->serif &&
+ seg->serif->edge &&
+ seg->serif->edge != edge );
+
+ if ( ( seg->link && seg->link->edge != NULL ) || 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 = seg->pos - seg2->pos;
+ if ( seg_delta < 0 )
+ seg_delta = -seg_delta;
+
+ 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;
+
+#if 0
+ /* set the edge's main direction */
+ edge->dir = AF_DIR_NONE;
+
+ if ( ups > downs )
+ edge->dir = (FT_Char)up_dir;
+
+ else if ( ups < downs )
+ edge->dir = (FT_Char)-up_dir;
+
+ else if ( ups == downs )
+ edge->dir = 0; /* both up and down! */
+#endif
+
+ /* gets 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;
+ }
+
+
+ FT_LOCAL_DEF( FT_Error )
+ af_latin_hints_detect_features( AF_GlyphHints hints,
+ AF_Dimension dim )
+ {
+ FT_Error error;
+
+
+ error = af_latin_hints_compute_segments( hints, dim );
+ if ( !error )
+ {
+ af_latin_hints_link_segments( hints, dim );
+
+ error = af_latin_hints_compute_edges( hints, dim );
+ }
+ return error;
+ }
+
+
+ FT_LOCAL_DEF( void )
+ af_latin_hints_compute_blue_edges( AF_GlyphHints hints,
+ AF_LatinMetrics metrics )
+ {
+ AF_AxisHints axis = &hints->axis[ AF_DIMENSION_VERT ];
+ AF_Edge edge = axis->edges;
+ AF_Edge edge_limit = edge + axis->num_edges;
+ AF_LatinAxis latin = &metrics->axis[ AF_DIMENSION_VERT ];
+ FT_Fixed scale = latin->scale;
+
+
+ /* compute which blue zones are active, i.e. have their scaled */
+ /* size < 3/4 pixels */
+
+ /* for each horizontal edge search the blue zone which is closest */
+ for ( ; edge < edge_limit; edge++ )
+ {
+ FT_Int bb;
+ AF_Width best_blue = NULL;
+ FT_Pos best_dist; /* initial threshold */
+
+
+ /* compute the initial threshold as a fraction of the EM size */
+ best_dist = FT_MulFix( metrics->units_per_em / 40, scale );
+
+ if ( best_dist > 64 / 2 )
+ best_dist = 64 / 2;
+
+ for ( bb = 0; bb < AF_LATIN_BLUE_MAX; bb++ )
+ {
+ AF_LatinBlue blue = latin->blues + bb;
+ FT_Bool is_top_blue, is_major_dir;
+
+
+ /* skip inactive blue zones (i.e., those that are too small) */
+ if ( !( blue->flags & AF_LATIN_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_blue = (FT_Byte)( ( blue->flags & AF_LATIN_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_blue ^ is_major_dir )
+ {
+ FT_Pos dist;
+
+
+ /* first of all, compare it to the reference position */
+ dist = edge->fpos - blue->ref.org;
+ if ( dist < 0 )
+ dist = -dist;
+
+ dist = FT_MulFix( dist, scale );
+ if ( dist < best_dist )
+ {
+ best_dist = dist;
+ best_blue = & blue->ref;
+ }
+
+ /* now, compare it to the overshoot position if the edge is */
+ /* rounded, and if the edge is over the reference position of a */
+ /* top zone, or under the reference position of a bottom zone */
+ if ( edge->flags & AF_EDGE_ROUND && dist != 0 )
+ {
+ FT_Bool is_under_ref = FT_BOOL( edge->fpos < blue->ref.org );
+
+
+ if ( is_top_blue ^ is_under_ref )
+ {
+ blue = latin->blues + bb;
+ dist = edge->fpos - blue->shoot.org;
+ if ( dist < 0 )
+ dist = -dist;
+
+ dist = FT_MulFix( dist, scale );
+ if ( dist < best_dist )
+ {
+ best_dist = dist;
+ best_blue = & blue->shoot;
+ }
+ }
+ }
+ }
+ }
+
+ if ( best_blue )
+ edge->blue_edge = best_blue;
+ }
+ }
+
+
+ static FT_Error
+ af_latin_hints_init( AF_GlyphHints hints,
+ AF_LatinMetrics metrics )
+ {
+ FT_Render_Mode mode;
+ FT_UInt32 scaler_flags, other_flags;
+ FT_Face face = metrics->root.scaler.face;
+
+
+ af_glyph_hints_rescale( hints, (AF_ScriptMetrics)metrics );
+
+ /*
+ * correct x_scale and y_scale if needed, since they may have
+ * been modified `af_latin_metrics_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 /* #ifdef AF_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;
+
+ /*
+ * In `light' hinting mode we disable horizontal hinting completely.
+ * We also do it if the face is italic.
+ */
+ if ( mode == FT_RENDER_MODE_LIGHT ||
+ (face->style_flags & FT_STYLE_FLAG_ITALIC) != 0 )
+ scaler_flags |= AF_SCALER_FLAG_NO_HORIZONTAL;
+
+ hints->scaler_flags = scaler_flags;
+ hints->other_flags = other_flags;
+
+ return 0;
+ }
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** L A T I N 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_latin_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_latin_compute_stem_width( AF_GlyphHints hints,
+ AF_Dimension dim,
+ FT_Pos width,
+ AF_Edge_Flags base_flags,
+ AF_Edge_Flags stem_flags )
+ {
+ AF_LatinMetrics metrics = (AF_LatinMetrics) hints->metrics;
+ AF_LatinAxis axis = & metrics->axis[dim];
+ FT_Pos dist = width;
+ FT_Int sign = 0;
+ FT_Int vertical = ( dim == AF_DIMENSION_VERT );
+
+
+ if ( !AF_LATIN_HINTS_DO_STEM_ADJUST( hints ) ||
+ axis->extra_light )
+ 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 */
+
+ /* leave the widths of serifs alone */
+
+ if ( ( stem_flags & AF_EDGE_SERIF ) && vertical && ( dist < 3 * 64 ) )
+ goto Done_Width;
+
+ else if ( ( base_flags & AF_EDGE_ROUND ) )
+ {
+ if ( dist < 80 )
+ dist = 64;
+ }
+ else if ( dist < 56 )
+ dist = 56;
+
+ if ( axis->width_count > 0 )
+ {
+ FT_Pos delta;
+
+
+ /* compare to standard width */
+ if ( axis->width_count > 0 )
+ {
+ delta = dist - axis->widths[0].cur;
+
+ if ( delta < 0 )
+ delta = -delta;
+
+ if ( delta < 40 )
+ {
+ dist = axis->widths[0].cur;
+ if ( dist < 48 )
+ dist = 48;
+
+ goto Done_Width;
+ }
+ }
+
+ if ( dist < 3 * 64 )
+ {
+ delta = dist & 63;
+ dist &= -64;
+
+ if ( delta < 10 )
+ dist += delta;
+
+ else if ( delta < 32 )
+ dist += 10;
+
+ else if ( delta < 54 )
+ dist += 54;
+
+ else
+ dist += delta;
+ }
+ else
+ dist = ( dist + 32 ) & ~63;
+ }
+ }
+ else
+ {
+ /* strong hinting process: snap the stem width to integer pixels */
+ FT_Pos org_dist = dist;
+
+
+ dist = af_latin_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 )
+ {
+ /* We only round to an integer width if the corresponding */
+ /* distortion is less than 1/4 pixel. Otherwise this */
+ /* makes everything worse since the diagonals, which are */
+ /* not hinted, appear a lot bolder or thinner than the */
+ /* vertical stems. */
+
+ FT_Int delta;
+
+
+ dist = ( dist + 22 ) & ~63;
+ delta = dist - org_dist;
+ if ( delta < 0 )
+ delta = -delta;
+
+ if (delta >= 16)
+ {
+ dist = org_dist;
+ if ( dist < 48 )
+ dist = ( dist + 64 ) >> 1;
+ }
+ }
+ 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_latin_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_latin_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;
+
+ AF_LOG(( "LINK: edge %d (opos=%.2f) linked to (%.2f), "
+ "dist was %.2f, now %.2f\n",
+ stem_edge-hints->axis[dim].edges, stem_edge->opos / 64.0,
+ stem_edge->pos / 64.0, dist / 64.0, fitted_width / 64.0 ));
+ }
+
+
+ static void
+ af_latin_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 ****/
+ /**** ****/
+ /*************************************************************************/
+ /*************************************************************************/
+ /*************************************************************************/
+
+
+ FT_LOCAL_DEF( void )
+ af_latin_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_Int n_edges;
+ AF_Edge edge;
+ AF_Edge anchor = 0;
+ FT_Int has_serifs = 0;
+
+
+ /* we begin by aligning all stems relative to the blue zone */
+ /* if needed -- that's only for horizontal edges */
+
+ if ( dim == AF_DIMENSION_VERT && 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;
+
+ AF_LOG(( "BLUE: edge %d (opos=%.2f) snapped to (%.2f), "
+ "was (%.2f)\n",
+ edge1-edges, 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_latin_align_linked_edge( hints, dim, edge1, edge2 );
+ edge2->flags |= AF_EDGE_DONE;
+ }
+
+ if ( !anchor )
+ anchor = edge;
+ }
+ }
+
+ /* now we will align all stem edges, trying to maintain the */
+ /* relative order of stems in the glyph */
+ 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 )
+ {
+ has_serifs++;
+ continue;
+ }
+
+ /* now align the stem */
+
+ /* this should not happen, but it's better to be safe */
+ if ( edge2->blue_edge )
+ {
+ AF_LOG(( "ASSERTION FAILED for edge %d\n", edge2-edges ));
+
+ af_latin_align_linked_edge( hints, dim, edge2, edge );
+ edge->flags |= AF_EDGE_DONE;
+ continue;
+ }
+
+ if ( !anchor )
+ {
+ FT_Pos org_len, org_center, cur_len;
+ FT_Pos cur_pos1, error1, error2, u_off, d_off;
+
+
+ org_len = edge2->opos - edge->opos;
+ cur_len = af_latin_compute_stem_width(
+ hints, dim, org_len,
+ (AF_Edge_Flags)edge->flags,
+ (AF_Edge_Flags)edge2->flags );
+ if ( cur_len <= 64 )
+ u_off = d_off = 32;
+ else
+ {
+ u_off = 38;
+ d_off = 26;
+ }
+
+ if ( cur_len < 96 )
+ {
+ org_center = edge->opos + ( org_len >> 1 );
+
+ cur_pos1 = FT_PIX_ROUND( org_center );
+
+ error1 = org_center - ( cur_pos1 - u_off );
+ if ( error1 < 0 )
+ error1 = -error1;
+
+ error2 = org_center - ( cur_pos1 + d_off );
+ if ( error2 < 0 )
+ error2 = -error2;
+
+ if ( error1 < error2 )
+ cur_pos1 -= u_off;
+ else
+ cur_pos1 += d_off;
+
+ edge->pos = cur_pos1 - cur_len / 2;
+ edge2->pos = edge->pos + cur_len;
+ }
+ else
+ edge->pos = FT_PIX_ROUND( edge->opos );
+
+ AF_LOG(( "ANCHOR: edge %d (opos=%.2f) and %d (opos=%.2f) "
+ "snapped to (%.2f) (%.2f)\n",
+ edge-edges, edge->opos / 64.0,
+ edge2-edges, edge2->opos / 64.0,
+ edge->pos / 64.0, edge2->pos / 64.0 ));
+ anchor = edge;
+
+ edge->flags |= AF_EDGE_DONE;
+
+ af_latin_align_linked_edge( hints, dim, edge, edge2 );
+ }
+ else
+ {
+ FT_Pos org_pos, org_len, org_center, cur_len;
+ FT_Pos cur_pos1, cur_pos2, delta1, delta2;
+
+
+ org_pos = anchor->pos + ( edge->opos - anchor->opos );
+ org_len = edge2->opos - edge->opos;
+ org_center = org_pos + ( org_len >> 1 );
+
+ cur_len = af_latin_compute_stem_width(
+ hints, dim, org_len,
+ (AF_Edge_Flags)edge->flags,
+ (AF_Edge_Flags)edge2->flags );
+
+ if ( edge2->flags & AF_EDGE_DONE )
+ edge->pos = edge2->pos - cur_len;
+
+ else if ( cur_len < 96 )
+ {
+ FT_Pos u_off, d_off;
+
+
+ cur_pos1 = FT_PIX_ROUND( org_center );
+
+ if (cur_len <= 64 )
+ u_off = d_off = 32;
+ else
+ {
+ u_off = 38;
+ d_off = 26;
+ }
+
+ delta1 = org_center - ( cur_pos1 - u_off );
+ if ( delta1 < 0 )
+ delta1 = -delta1;
+
+ delta2 = org_center - ( cur_pos1 + d_off );
+ if ( delta2 < 0 )
+ delta2 = -delta2;
+
+ if ( delta1 < delta2 )
+ cur_pos1 -= u_off;
+ else
+ cur_pos1 += d_off;
+
+ edge->pos = cur_pos1 - cur_len / 2;
+ edge2->pos = cur_pos1 + cur_len / 2;
+
+ AF_LOG(( "STEM: %d (opos=%.2f) to %d (opos=%.2f) "
+ "snapped to (%.2f) and (%.2f)\n",
+ edge-edges, edge->opos / 64.0,
+ edge2-edges, edge2->opos / 64.0,
+ edge->pos / 64.0, edge2->pos / 64.0 ));
+ }
+ else
+ {
+ org_pos = anchor->pos + ( edge->opos - anchor->opos );
+ org_len = edge2->opos - edge->opos;
+ org_center = org_pos + ( org_len >> 1 );
+
+ cur_len = af_latin_compute_stem_width(
+ hints, dim, org_len,
+ (AF_Edge_Flags)edge->flags,
+ (AF_Edge_Flags)edge2->flags );
+
+ cur_pos1 = FT_PIX_ROUND( org_pos );
+ delta1 = cur_pos1 + ( cur_len >> 1 ) - org_center;
+ if ( delta1 < 0 )
+ delta1 = -delta1;
+
+ cur_pos2 = FT_PIX_ROUND( org_pos + org_len ) - cur_len;
+ delta2 = cur_pos2 + ( cur_len >> 1 ) - org_center;
+ if ( delta2 < 0 )
+ delta2 = -delta2;
+
+ edge->pos = ( delta1 < delta2 ) ? cur_pos1 : cur_pos2;
+ edge2->pos = edge->pos + cur_len;
+
+ AF_LOG(( "STEM: %d (opos=%.2f) to %d (opos=%.2f) "
+ "snapped to (%.2f) and (%.2f)\n",
+ edge-edges, edge->opos / 64.0,
+ edge2-edges, edge2->opos / 64.0,
+ edge->pos / 64.0, edge2->pos / 64.0 ));
+ }
+
+ edge->flags |= AF_EDGE_DONE;
+ edge2->flags |= AF_EDGE_DONE;
+
+ if ( edge > edges && edge->pos < edge[-1].pos )
+ {
+ AF_LOG(( "BOUND: %d (pos=%.2f) to (%.2f)\n",
+ edge-edges, edge->pos / 64.0, edge[-1].pos / 64.0 ));
+ edge->pos = edge[-1].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, delta;
+
+
+ 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 ( 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 ( has_serifs || !anchor )
+ {
+ /*
+ * now hint the remaining edges (serifs and single) in order
+ * to complete our processing
+ */
+ for ( edge = edges; edge < edge_limit; edge++ )
+ {
+ FT_Pos delta;
+
+
+ if ( edge->flags & AF_EDGE_DONE )
+ continue;
+
+ delta = 1000;
+
+ if ( edge->serif )
+ {
+ delta = edge->serif->opos - edge->opos;
+ if ( delta < 0 )
+ delta = -delta;
+ }
+
+ if ( delta < 64 + 16 )
+ {
+ af_latin_align_serif_edge( hints, edge->serif, edge );
+ AF_LOG(( "SERIF: edge %d (opos=%.2f) serif to %d (opos=%.2f) "
+ "aligned to (%.2f)\n",
+ edge-edges, edge->opos / 64.0,
+ edge->serif - edges, edge->serif->opos / 64.0,
+ edge->pos / 64.0 ));
+ }
+ else if ( !anchor )
+ {
+ AF_LOG(( "SERIF_ANCHOR: edge %d (opos=%.2f) snapped to (%.2f)\n",
+ edge-edges, edge->opos / 64.0, edge->pos / 64.0 ));
+ edge->pos = FT_PIX_ROUND( edge->opos );
+ anchor = edge;
+ }
+ else
+ {
+ AF_Edge before, after;
+
+
+ for ( before = edge - 1; before >= edges; before-- )
+ if ( before->flags & AF_EDGE_DONE )
+ break;
+
+ for ( after = edge + 1; after < edge_limit; after++ )
+ if ( after->flags & AF_EDGE_DONE )
+ break;
+
+ if ( before >= edges && before < edge &&
+ after < edge_limit && after > edge )
+ {
+ edge->pos = before->pos +
+ FT_MulDiv( edge->opos - before->opos,
+ after->pos - before->pos,
+ after->opos - before->opos );
+ AF_LOG(( "SERIF_LINK1: edge %d (opos=%.2f) snapped to (%.2f) "
+ "from %d (opos=%.2f)\n",
+ edge-edges, edge->opos / 64.0,
+ edge->pos / 64.0, before - edges,
+ before->opos / 64.0 ));
+ }
+ else
+ {
+ edge->pos = anchor->pos +
+ ( ( edge->opos - anchor->opos + 16 ) & ~31 );
+ AF_LOG(( "SERIF_LINK2: edge %d (opos=%.2f) snapped to (%.2f)\n",
+ edge-edges, edge->opos / 64.0, edge->pos / 64.0 ));
+ }
+ }
+
+ edge->flags |= AF_EDGE_DONE;
+
+ if ( edge > edges && edge->pos < edge[-1].pos )
+ edge->pos = edge[-1].pos;
+
+ if ( edge + 1 < edge_limit &&
+ edge[1].flags & AF_EDGE_DONE &&
+ edge->pos > edge[1].pos )
+ edge->pos = edge[1].pos;
+ }
+ }
+ }
+
+
+ static FT_Error
+ af_latin_hints_apply( AF_GlyphHints hints,
+ FT_Outline* outline,
+ AF_LatinMetrics metrics )
+ {
+ FT_Error error;
+ int dim;
+
+
+ error = af_glyph_hints_reload( hints, outline, 1 );
+ if ( error )
+ goto Exit;
+
+ /* analyze glyph outline */
+#ifdef AF_USE_WARPER
+ if ( metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT ||
+ AF_HINTS_DO_HORIZONTAL( hints ) )
+#else
+ if ( AF_HINTS_DO_HORIZONTAL( hints ) )
+#endif
+ {
+ error = af_latin_hints_detect_features( hints, AF_DIMENSION_HORZ );
+ if ( error )
+ goto Exit;
+ }
+
+ if ( AF_HINTS_DO_VERTICAL( hints ) )
+ {
+ error = af_latin_hints_detect_features( hints, AF_DIMENSION_VERT );
+ if ( error )
+ goto Exit;
+
+ af_latin_hints_compute_blue_edges( hints, metrics );
+ }
+
+ /* grid-fit the outline */
+ for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ )
+ {
+#ifdef AF_USE_WARPER
+ if ( ( dim == AF_DIMENSION_HORZ &&
+ metrics->root.scaler.render_mode == FT_RENDER_MODE_LIGHT ) )
+ {
+ AF_WarperRec warper;
+ FT_Fixed scale;
+ FT_Pos delta;
+
+
+ af_warper_compute( &warper, hints, dim, &scale, &delta );
+ af_glyph_hints_scale_dim( hints, dim, scale, delta );
+ continue;
+ }
+#endif
+
+ if ( ( dim == AF_DIMENSION_HORZ && AF_HINTS_DO_HORIZONTAL( hints ) ) ||
+ ( dim == AF_DIMENSION_VERT && AF_HINTS_DO_VERTICAL( hints ) ) )
+ {
+ af_latin_hint_edges( hints, (AF_Dimension)dim );
+ af_glyph_hints_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;
+ }
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /***** *****/
+ /***** L A T I N S C R I P T C L A S S *****/
+ /***** *****/
+ /*************************************************************************/
+ /*************************************************************************/
+
+
+ /* XXX: this should probably fine tuned to differentiate better between */
+ /* scripts... */
+
+ static const AF_Script_UniRangeRec af_latin_uniranges[] =
+ {
+ { 0x0020, 0x007F }, /* Basic Latin (no control characters) */
+ { 0x00A0, 0x00FF }, /* Latin-1 Supplement (no control characters) */
+ { 0x0100, 0x017F }, /* Latin Extended-A */
+ { 0x0180, 0x024F }, /* Latin Extended-B */
+ { 0x0250, 0x02AF }, /* IPA Extensions */
+ { 0x02B0, 0x02FF }, /* Spacing Modifier Letters */
+ { 0x0300, 0x036F }, /* Combining Diacritical Marks */
+ { 0x0370, 0x03FF }, /* Greek and Coptic */
+ { 0x0400, 0x04FF }, /* Cyrillic */
+ { 0x0500, 0x052F }, /* Cyrillic Supplement */
+ { 0x1D00, 0x1D7F }, /* Phonetic Extensions */
+ { 0x1D80, 0x1DBF }, /* Phonetic Extensions Supplement */
+ { 0x1DC0, 0x1DFF }, /* Combining Diacritical Marks Supplement */
+ { 0x1E00, 0x1EFF }, /* Latin Extended Additional */
+ { 0x1F00, 0x1FFF }, /* Greek Extended */
+ { 0x2000, 0x206F }, /* General Punctuation */
+ { 0x2070, 0x209F }, /* Superscripts and Subscripts */
+ { 0x20A0, 0x20CF }, /* Currency Symbols */
+ { 0x2150, 0x218F }, /* Number Forms */
+ { 0x2460, 0x24FF }, /* Enclosed Alphanumerics */
+ { 0 , 0 }
+ };
+
+
+ FT_CALLBACK_TABLE_DEF const AF_ScriptClassRec
+ af_latin_script_class =
+ {
+ AF_SCRIPT_LATIN,
+ af_latin_uniranges,
+
+ sizeof( AF_LatinMetricsRec ),
+
+ (AF_Script_InitMetricsFunc) af_latin_metrics_init,
+ (AF_Script_ScaleMetricsFunc)af_latin_metrics_scale,
+ (AF_Script_DoneMetricsFunc) NULL,
+
+ (AF_Script_InitHintsFunc) af_latin_hints_init,
+ (AF_Script_ApplyHintsFunc) af_latin_hints_apply
+ };
+
+
+/* END */
projects / reactos.git / blobdiff