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kc3-lang/freetype/src/pshinter/pshalgo2.c
David Turner
- src/pshinter/pshalgo2.c
-
#include <ft2build.h> #include FT_INTERNAL_OBJECTS_H #include FT_INTERNAL_DEBUG_H #include "pshalgo2.h" #ifdef DEBUG_HINTER extern PSH2_Hint_Table ps2_debug_hint_table = 0; extern PSH2_HintFunc ps2_debug_hint_func = 0; extern PSH2_Glyph ps2_debug_glyph = 0; #endif /************************************************************************/ /************************************************************************/ /***** *****/ /***** BASIC HINTS RECORDINGS *****/ /***** *****/ /************************************************************************/ /************************************************************************/ /* return true iff two stem hints overlap */ static FT_Int psh2_hint_overlap( PSH2_Hint hint1, PSH2_Hint hint2 ) { return ( hint1->org_pos + hint1->org_len >= hint2->org_pos && hint2->org_pos + hint2->org_len >= hint1->org_pos ); } /* destroy hints table */ static void psh2_hint_table_done( PSH2_Hint_Table table, FT_Memory memory ) { FREE( table->zones ); table->num_zones = 0; table->zone = 0; FREE( table->sort ); FREE( table->hints ); table->num_hints = 0; table->max_hints = 0; table->sort_global = 0; } /* deactivate all hints in a table */ static void psh2_hint_table_deactivate( PSH2_Hint_Table table ) { FT_UInt count = table->max_hints; PSH2_Hint hint = table->hints; for ( ; count > 0; count--, hint++ ) { psh2_hint_deactivate(hint); hint->order = -1; } } /* internal function used to record a new hint */ static void psh2_hint_table_record( PSH2_Hint_Table table, FT_UInt index ) { PSH2_Hint hint = table->hints + index; if ( index >= table->max_hints ) { FT_ERROR(( "%s.activate: invalid hint index %d\n", index )); return; } /* ignore active hints */ if ( psh2_hint_is_active(hint) ) return; psh2_hint_activate(hint); /* now scan the current active hint set in order to determine */ /* if we're overlapping with another segment.. */ { PSH2_Hint* sorted = table->sort_global; FT_UInt count = table->num_hints; PSH2_Hint hint2; hint->parent = 0; for ( ; count > 0; count--, sorted++ ) { hint2 = sorted[0]; if ( psh2_hint_overlap( hint, hint2 ) ) { hint->parent = hint2; break; } } } if ( table->num_hints < table->max_hints ) table->sort_global[ table->num_hints++ ] = hint; else { FT_ERROR(( "%s.activate: too many sorted hints !! BUG !!\n", "ps.fitter" )); } } static void psh2_hint_table_record_mask( PSH2_Hint_Table table, PS_Mask hint_mask ) { FT_Int mask = 0, val = 0; FT_Byte* cursor = hint_mask->bytes; FT_UInt index, limit; limit = hint_mask->num_bits; if ( limit != table->max_hints ) { FT_ERROR(( "%s.activate_mask: invalid bit count (%d instead of %d)\n", "ps.fitter", hint_mask->num_bits, table->max_hints )); } for ( index = 0; index < limit; index++ ) { if ( mask == 0 ) { val = *cursor++; mask = 0x80; } if ( val & mask ) psh2_hint_table_record( table, index ); mask >>= 1; } } /* create hints table */ static FT_Error psh2_hint_table_init( PSH2_Hint_Table table, PS_Hint_Table hints, PS_Mask_Table hint_masks, PS_Mask_Table counter_masks, FT_Memory memory ) { FT_UInt count = hints->num_hints; FT_Error error; FT_UNUSED(counter_masks); /* allocate our tables */ if ( ALLOC_ARRAY( table->sort, 2*count, PSH2_Hint ) || ALLOC_ARRAY( table->hints, count, PSH2_HintRec ) || ALLOC_ARRAY( table->zones, 2*count+1, PSH2_ZoneRec ) ) goto Exit; table->max_hints = count; table->sort_global = table->sort + count; table->num_hints = 0; table->num_zones = 0; table->zone = 0; /* now, initialise the "hints" array */ { PSH2_Hint write = table->hints; PS_Hint read = hints->hints; for ( ; count > 0; count--, write++, read++ ) { write->org_pos = read->pos; write->org_len = read->len; write->flags = read->flags; } } /* we now need to determine the initial "parent" stems, first */ /* activate the hints that are given by the initial hint masks */ if ( hint_masks ) { FT_UInt count = hint_masks->num_masks; PS_Mask mask = hint_masks->masks; table->hint_masks = hint_masks; for ( ; count > 0; count--, mask++ ) psh2_hint_table_record_mask( table, mask ); } /* now, do a linear parse in case some hints were left alone */ if ( table->num_hints != table->max_hints ) { FT_UInt index, count; FT_ERROR(( "%s.init: missing/incorrect hint masks !!\n" )); count = table->max_hints; for ( index = 0; index < count; index++ ) psh2_hint_table_record( table, index ); } Exit: return error; } static void psh2_hint_table_activate_mask( PSH2_Hint_Table table, PS_Mask hint_mask ) { FT_Int mask = 0, val = 0; FT_Byte* cursor = hint_mask->bytes; FT_UInt index, limit, count; limit = hint_mask->num_bits; count = 0; psh2_hint_table_deactivate( table ); for ( index = 0; index < limit; index++ ) { if ( mask == 0 ) { val = *cursor++; mask = 0x80; } if ( val & mask ) { PSH2_Hint hint = &table->hints[index]; if ( !psh2_hint_is_active(hint) ) { PSH2_Hint* sort = table->sort; FT_UInt count2; PSH2_Hint hint2; #if 0 for ( count2 = count; count2 > 0; count2--, sort++ ) { hint2 = sort[0]; if ( psh2_hint_overlap( hint, hint2 ) ) { FT_ERROR(( "%s.activate_mask: found overlapping hints\n", "psf.hint" )); } } #else count2 = 0; #endif if ( count2 == 0 ) { psh2_hint_activate( hint ); if ( count < table->max_hints ) table->sort[count++] = hint; else { FT_ERROR(( "%s.activate_mask: too many active hints\n", "psf.hint" )); } } } } mask >>= 1; } table->num_hints = count; /* now, sort the hints, they're guaranteed to not overlap */ /* so we can compare their "org_pos" field directly.. */ { FT_Int i1, i2; PSH2_Hint hint1, hint2; PSH2_Hint* sort = table->sort; /* a simple bubble sort will do, since in 99% of cases, the hints */ /* will be already sorted.. and the sort will be linear */ for ( i1 = 1; i1 < (FT_Int)count; i1++ ) { hint1 = sort[i1]; for ( i2 = i1-1; i2 >= 0; i2-- ) { hint2 = sort[i2]; if ( hint2->org_pos < hint1->org_pos ) break; sort[i1] = hint2; sort[i2] = hint1; } } } } /************************************************************************/ /************************************************************************/ /***** *****/ /***** HINTS GRID-FITTING AND OPTIMISATION *****/ /***** *****/ /************************************************************************/ /************************************************************************/ #ifdef DEBUG_HINTER static void ps_simple_scale( PSH2_Hint_Table table, FT_Fixed scale, FT_Fixed delta, FT_Bool vertical ) { PSH2_Hint hint; FT_UInt count; for ( count = 0; count < table->max_hints; count++ ) { hint = table->hints + count; hint->cur_pos = FT_MulFix( hint->org_pos, scale ) + delta; hint->cur_len = FT_MulFix( hint->org_len, scale ); if (ps2_debug_hint_func) ps2_debug_hint_func( hint, vertical ); } } #endif static void psh2_hint_align( PSH2_Hint hint, PSH_Globals globals, FT_Bool vertical ) { PSH_Dimension dim = &globals->dimension[vertical]; FT_Fixed scale = dim->scale_mult; FT_Fixed delta = dim->scale_delta; if ( !psh2_hint_is_fitted(hint) ) { FT_Pos pos = FT_MulFix( hint->org_pos, scale ) + delta; FT_Pos len = FT_MulFix( hint->org_len, scale ); FT_Pos fit_center; FT_Pos fit_len; PSH_AlignmentRec align; /* compute fitted width/height */ fit_len = 0; if ( hint->org_len ) { fit_len = psh_dimension_snap_width( dim, hint->org_len ); if ( fit_len < 64 ) fit_len = 64; else fit_len = (fit_len + 32 ) & -64; } hint->cur_len = fit_len; /* check blue zones for horizontal stems */ align.align = 0; if (!vertical) { psh_blues_snap_stem( &globals->blues, hint->org_pos + hint->org_len, hint->org_pos, &align ); } switch (align.align) { case PSH_BLUE_ALIGN_TOP: { /* the top of the stem is aligned against a blue zone */ hint->cur_pos = align.align_top - fit_len; break; } case PSH_BLUE_ALIGN_BOT: { /* the bottom of the stem is aligned against a blue zone */ hint->cur_pos = align.align_bot; break; } case PSH_BLUE_ALIGN_TOP | PSH_BLUE_ALIGN_BOT: { /* both edges of the stem are aligned against blue zones */ hint->cur_pos = align.align_bot; hint->cur_len = align.align_top - align.align_bot; break; } default: { PSH2_Hint parent = hint->parent; if ( parent ) { FT_Pos par_org_center, par_cur_center; FT_Pos cur_org_center, cur_delta; /* ensure that parent is already fitted */ if ( !psh2_hint_is_fitted(parent) ) psh2_hint_align( parent, globals, vertical ); par_org_center = parent->org_pos + (parent->org_len/2); par_cur_center = parent->cur_pos + (parent->cur_len/2); cur_org_center = hint->org_pos + (hint->org_len/2); cur_delta = FT_MulFix( cur_org_center - par_org_center, scale ); #if 0 if ( cur_delta >= 0 ) cur_delta = (cur_delta+16) & -64; else cur_delta = -((-cur_delta+16) & -64); #endif pos = par_cur_center + cur_delta - (len >> 1); } /* normal processing */ if ( (fit_len/64) & 1 ) { /* odd number of pixels */ fit_center = ((pos + (len >> 1)) & -64) + 32; } else { /* even number of pixels */ fit_center = (pos + (len >> 1) + 32) & -64; } hint->cur_pos = fit_center - (fit_len >> 1); } } psh2_hint_set_fitted(hint); #ifdef DEBUG_HINTER if (ps2_debug_hint_func) ps2_debug_hint_func( hint, vertical ); #endif } } static void psh2_hint_table_align_hints( PSH2_Hint_Table table, PSH_Globals globals, FT_Bool vertical ) { PSH_Dimension dim = &globals->dimension[vertical]; FT_Fixed scale = dim->scale_mult; FT_Fixed delta = dim->scale_delta; PSH2_Hint hint; FT_UInt count; #ifdef DEBUG_HINTER if ( ps_debug_no_vert_hints && vertical ) { ps_simple_scale( table, scale, delta, vertical ); return; } if ( ps_debug_no_horz_hints && !vertical ) { ps_simple_scale( table, scale, delta, vertical ); return; } #endif hint = table->hints; count = table->max_hints; for ( ; count > 0; count--, hint++ ) psh2_hint_align( hint, globals, vertical ); } /************************************************************************/ /************************************************************************/ /***** *****/ /***** POINTS INTERPOLATION ROUTINES *****/ /***** *****/ /************************************************************************/ /************************************************************************/ #define PSH2_ZONE_MIN -3200000 #define PSH2_ZONE_MAX +3200000 #define xxDEBUG_ZONES #ifdef DEBUG_ZONES #include <stdio.h> static void print_zone( PSH2_Zone zone ) { printf( "zone [scale,delta,min,max] = [%.3f,%.3f,%d,%d]\n", zone->scale/65536.0, zone->delta/64.0, zone->min, zone->max ); } #else # define print_zone(x) do { } while (0) #endif /* setup interpolation zones once the hints have been grid-fitted */ /* by the optimizer.. */ static void psh2_hint_table_setup_zones( PSH2_Hint_Table table, FT_Fixed scale, FT_Fixed delta ) { FT_UInt count; PSH2_Zone zone; PSH2_Hint *sort, hint, hint2; zone = table->zones; /* special case, no hints defined */ if ( table->num_hints == 0 ) { zone->scale = scale; zone->delta = delta; zone->min = PSH2_ZONE_MIN; zone->max = PSH2_ZONE_MAX; table->num_zones = 1; table->zone = zone; return; } /* the first zone is before the first hint */ /* x' = (x-x0)*s + x0' = x*s + ( x0' - x0*s ) */ sort = table->sort; hint = sort[0]; zone->scale = scale; zone->delta = hint->cur_pos - FT_MulFix( hint->org_pos, scale ); zone->min = PSH2_ZONE_MIN; zone->max = hint->org_pos; print_zone( zone ); zone++; for ( count = table->num_hints; count > 0; count-- ) { FT_Fixed scale2; if ( hint->org_len > 0 ) { /* setup a zone for inner-stem interpolation */ /* (x' - x0') = (x - x0)*(x1'-x0')/(x1-x0) */ /* x' = x*s2 + x0' - x0*s2 */ scale2 = FT_DivFix( hint->cur_len, hint->org_len ); zone->scale = scale2; zone->min = hint->org_pos; zone->max = hint->org_pos + hint->org_len; zone->delta = hint->cur_pos - FT_MulFix( zone->min, scale2 ); print_zone( zone ); zone++; } if ( count == 1 ) break; sort++; hint2 = sort[0]; /* setup zone for inter-stem interpolation */ /* (x'-x1') = (x-x1)*(x2'-x1')/(x2-x1) */ /* x' = x*s3 + x1' - x1*s3 */ scale2 = FT_DivFix( hint2->cur_pos - (hint->cur_pos + hint->cur_len), hint2->org_pos - (hint->org_pos + hint->org_len) ); zone->scale = scale2; zone->min = hint->org_pos + hint->org_len; zone->max = hint2->org_pos; zone->delta = hint->cur_pos + hint->cur_len - FT_MulFix( zone->min, scale2 ); print_zone( zone ); zone++; hint = hint2; } /* the last zone */ zone->scale = scale; zone->min = hint->org_pos + hint->org_len; zone->max = PSH2_ZONE_MAX; zone->delta = hint->cur_pos + hint->cur_len - FT_MulFix( zone->min, scale ); print_zone( zone ); zone++; table->num_zones = zone - table->zones; table->zone = table->zones; } /* tune a single coordinate with the current interpolation zones */ static FT_Pos psh2_hint_table_tune_coord( PSH2_Hint_Table table, FT_Int coord ) { PSH2_Zone zone; zone = table->zone; if ( coord < zone->min ) { do { if ( zone == table->zones ) break; zone--; } while ( coord < zone->min ); table->zone = zone; } else if ( coord > zone->max ) { do { if ( zone == table->zones + table->num_zones - 1 ) break; zone++; } while ( coord > zone->max ); table->zone = zone; } return FT_MulFix( coord, zone->scale ) + zone->delta; } #if 0 /* tune a given outline with current interpolation zones */ /* the function only works in a single dimension.. */ static void psh2_hint_table_tune_outline( PSH2_Hint_Table table, FT_Outline* outline, PSH_Globals globals, FT_Bool vertical ) { FT_UInt count, first, last; PS_Mask_Table hint_masks = table->hint_masks; PS_Mask mask; PSH_Dimension dim = &globals->dimension[vertical]; FT_Fixed scale = dim->scale_mult; FT_Fixed delta = dim->scale_delta; if ( hint_masks && hint_masks->num_masks > 0 ) { first = 0; mask = hint_masks->masks; count = hint_masks->num_masks; for ( ; count > 0; count--, mask++ ) { last = mask->end_point; if ( last > first ) { FT_Vector* vec; FT_Int count2; psh2_hint_table_activate_mask( table, mask ); psh2_hint_table_optimize( table, globals, outline, vertical ); psh2_hint_table_setup_zones( table, scale, delta ); last = mask->end_point; vec = outline->points + first; count2 = last - first; for ( ; count2 > 0; count2--, vec++ ) { FT_Pos x, *px; px = vertical ? &vec->x : &vec->y; x = *px; *px = psh2_hint_table_tune_coord( table, (FT_Int)x ); } } first = last; } } else /* no hints in this glyph, simply scale the outline */ { FT_Vector* vec; vec = outline->points; count = outline->n_points; if ( vertical ) { for ( ; count > 0; count--, vec++ ) vec->x = FT_MulFix( vec->x, scale ) + delta; } else { for ( ; count > 0; count--, vec++ ) vec->y = FT_MulFix( vec->y, scale ) + delta; } } } #endif /************************************************************************/ /************************************************************************/ /***** *****/ /***** HINTER GLYPH MANAGEMENT *****/ /***** *****/ /************************************************************************/ /************************************************************************/ static int psh2_point_is_extremum( PSH2_Point point ) { PSH2_Point before = point; PSH2_Point after = point; FT_Pos d_before; FT_Pos d_after; do { before = before->prev; if ( before == point ) return 0; d_before = before->org_u - point->org_u; } while ( d_before == 0 ); do { after = after->next; if ( after == point ) return 0; d_after = after->org_u - point->org_u; } while ( d_after == 0 ); return ( ( d_before > 0 && d_after > 0 ) || ( d_before < 0 && d_after < 0 ) ); } static void psh2_glyph_done( PSH2_Glyph glyph ) { FT_Memory memory = glyph->memory; psh2_hint_table_done( &glyph->hint_tables[1], memory ); psh2_hint_table_done( &glyph->hint_tables[0], memory ); FREE( glyph->points ); FREE( glyph->contours ); glyph->num_points = 0; glyph->num_contours = 0; glyph->memory = 0; } static int psh2_compute_dir( FT_Pos dx, FT_Pos dy ) { FT_Pos ax, ay; int result = PSH2_DIR_NONE; ax = ( dx >= 0 ) ? dx : -dx; ay = ( dy >= 0 ) ? dy : -dy; if ( ay*12 < ax ) { /* |dy| <<< |dx| means a near-horizontal segment */ result = ( dx >= 0 ) ? PSH2_DIR_RIGHT : PSH2_DIR_LEFT; } else if ( ax*12 < ay ) { /* |dx| <<< |dy| means a near-vertical segment */ result = ( dy >= 0 ) ? PSH2_DIR_UP : PSH2_DIR_DOWN; } return result; } static FT_Error psh2_glyph_init( PSH2_Glyph glyph, FT_Outline* outline, PS_Hints ps_hints, PSH_Globals globals ) { FT_Error error; FT_Memory memory; /* clear all fields */ memset( glyph, 0, sizeof(*glyph) ); memory = globals->memory; /* allocate and setup points + contours arrays */ if ( ALLOC_ARRAY( glyph->points, outline->n_points, PSH2_PointRec ) || ALLOC_ARRAY( glyph->contours, outline->n_contours, PSH2_ContourRec ) ) goto Exit; glyph->num_points = outline->n_points; glyph->num_contours = outline->n_contours; { FT_UInt first = 0, next, n; PSH2_Point points = glyph->points; PSH2_Contour contour = glyph->contours; for ( n = 0; n < glyph->num_contours; n++ ) { FT_Int count; PSH2_Point point; next = outline->contours[n] + 1; count = next - first; contour->start = points + first; contour->count = (FT_UInt)count; if ( count > 0 ) { point = points + first; point->prev = points + next - 1; point->contour = contour; for ( ; count > 1; count-- ) { point[0].next = point + 1; point[1].prev = point; point++; point->contour = contour; } point->next = points + first; } contour++; first = next; } } { PSH2_Point points = glyph->points; PSH2_Point point = points; FT_Vector* vec = outline->points; FT_UInt n; for ( n = 0; n < glyph->num_points; n++, point++ ) { FT_Int n_prev = point->prev - points; FT_Int n_next = point->next - points; FT_Pos dxi, dyi, dxo, dyo; if ( !(outline->tags[n] & FT_Curve_Tag_On) ) point->flags = PSH2_POINT_OFF; dxi = vec[n].x - vec[n_prev].x; dyi = vec[n].y - vec[n_prev].y; point->dir_in = psh2_compute_dir( dxi, dyi ); dxo = vec[n_next].x - vec[n].x; dyo = vec[n_next].y - vec[n].y; point->dir_out = psh2_compute_dir( dxo, dyo ); /* detect smooth points */ if ( point->flags & PSH2_POINT_OFF ) { point->flags |= PSH2_POINT_SMOOTH; } else if ( point->dir_in != PSH2_DIR_NONE || point->dir_out != PSH2_DIR_NONE ) { if ( point->dir_in == point->dir_out ) point->flags |= PSH2_POINT_SMOOTH; } else { FT_Angle angle_in, angle_out, diff; angle_in = FT_Atan2( dxi, dyi ); angle_out = FT_Atan2( dxo, dyo ); diff = angle_in - angle_out; if ( diff < 0 ) diff = -diff; if ( diff > FT_ANGLE_PI ) diff = FT_ANGLE_2PI - diff; if ( (diff < FT_ANGLE_PI/16) ) point->flags |= PSH2_POINT_SMOOTH; } } } glyph->memory = memory; glyph->outline = outline; glyph->globals = globals; /* now deal with hints tables */ error = psh2_hint_table_init( &glyph->hint_tables [0], &ps_hints->dimension[0].hints, &ps_hints->dimension[0].masks, &ps_hints->dimension[0].counters, memory ); if (error) goto Exit; error = psh2_hint_table_init( &glyph->hint_tables [1], &ps_hints->dimension[1].hints, &ps_hints->dimension[1].masks, &ps_hints->dimension[1].counters, memory ); if (error) goto Exit; Exit: return error; } /* load outline point coordinates into hinter glyph */ static void psh2_glyph_load_points( PSH2_Glyph glyph, FT_Bool vertical ) { FT_Vector* vec = glyph->outline->points; PSH2_Point point = glyph->points; FT_UInt count = glyph->num_points; for ( ; count > 0; count--, point++, vec++ ) { point->flags &= PSH2_POINT_OFF | PSH2_POINT_SMOOTH; point->hint = 0; if (vertical) point->org_u = vec->x; else point->org_u = vec->y; #ifdef DEBUG_HINTER point->org_x = vec->x; point->org_y = vec->y; #endif } } /* save hinted point coordinates back to outline */ static void psh2_glyph_save_points( PSH2_Glyph glyph, FT_Bool vertical ) { FT_UInt n; PSH2_Point point = glyph->points; FT_Vector* vec = glyph->outline->points; char* tags = glyph->outline->tags; for ( n = 0; n < glyph->num_points; n++ ) { if (vertical) vec[n].x = point->cur_u; else vec[n].y = point->cur_u; if ( psh2_point_is_strong(point) ) tags[n] |= vertical ? 32 : 64; #ifdef DEBUG_HINTER if (vertical) { point->cur_x = point->cur_u; point->flags_x = point->flags; } else { point->cur_y = point->cur_u; point->flags_y = point->flags; } #endif point++; } } static void psh2_hint_table_find_strong_point( PSH2_Hint_Table table, PSH2_Point point, FT_Int major_dir ) { PSH2_Hint* sort = table->sort; FT_UInt num_hints = table->num_hints; for ( ; num_hints > 0; num_hints--, sort++ ) { PSH2_Hint hint = sort[0]; if ( ABS(point->dir_in) == major_dir || ABS(point->dir_out) == major_dir ) { FT_Pos d; d = point->org_u - hint->org_pos; if ( ABS(d) < 3 ) { Is_Strong: psh2_point_set_strong(point); point->hint = hint; break; } d -= hint->org_len; if ( ABS(d) < 3 ) goto Is_Strong; } #if 1 if ( point->org_u >= hint->org_pos && point->org_u <= hint->org_pos + hint->org_len && psh2_point_is_extremum( point ) ) { /* attach to hint, but don't mark as strong */ point->hint = hint; break; } #endif } } /* find strong points in a glyph */ static void psh2_glyph_find_strong_points( PSH2_Glyph glyph, FT_Bool vertical ) { /* a point is strong if it is located on a stem */ /* edge and has an "in" or "out" tangent to the hint's direction */ { PSH2_Hint_Table table = &glyph->hint_tables[vertical]; PS_Mask mask = table->hint_masks->masks; FT_UInt num_masks = table->hint_masks->num_masks; FT_UInt first = 0; FT_Int major_dir = vertical ? PSH2_DIR_UP : PSH2_DIR_RIGHT; FT_Int minor_dir = vertical ? PSH2_DIR_RIGHT : PSH2_DIR_UP; /* process secondary hints to "selected" points */ if ( num_masks > 1 ) { mask++; for ( ; num_masks > 1; num_masks--, mask++ ) { FT_UInt next; FT_Int count; next = mask->end_point; count = next - first; if ( count > 0 ) { PSH2_Point point = glyph->points + first; psh2_hint_table_activate_mask( table, mask ); for ( ; count > 0; count--, point++ ) psh2_hint_table_find_strong_point( table, point, major_dir ); } first = next; } } /* process primary hints for all points */ if ( num_masks == 1 ) { FT_UInt count = glyph->num_points; PSH2_Point point = glyph->points; psh2_hint_table_activate_mask( table, table->hint_masks->masks ); for ( ; count > 0; count--, point++ ) { if ( !psh2_point_is_strong(point) ) psh2_hint_table_find_strong_point( table, point, major_dir ); } } /* now, certain points may have been attached to hint and */ /* not marked as strong, update their flags then.. */ { FT_UInt count = glyph->num_points; PSH2_Point point = glyph->points; for ( ; count > 0; count--, point++ ) if ( point->hint && !psh2_point_is_strong(point) ) psh2_point_set_strong(point); } } } /* interpolate strong points with the help of hinted coordinates */ static void psh2_glyph_interpolate_strong_points( PSH2_Glyph glyph, FT_Bool vertical ) { PSH_Dimension dim = &glyph->globals->dimension[vertical]; FT_Fixed scale = dim->scale_mult; FT_Fixed delta = dim->scale_delta; { FT_UInt count = glyph->num_points; PSH2_Point point = glyph->points; for ( ; count > 0; count--, point++ ) { PSH2_Hint hint = point->hint; if ( hint ) { FT_Pos delta; delta = point->org_u - hint->org_pos; if ( delta <= 0 ) point->cur_u = hint->cur_pos + FT_MulFix( delta, scale ); else if ( delta >= hint->org_len ) point->cur_u = hint->cur_pos + hint->cur_len + FT_MulFix( delta - hint->org_len, scale ); else if ( hint->org_len > 0 ) point->cur_u = hint->cur_pos + FT_MulDiv( delta, hint->cur_len, hint->org_len ); else point->cur_u = hint->cur_pos; psh2_point_set_fitted(point); } } } } static void psh2_glyph_interpolate_normal_points( PSH2_Glyph glyph, FT_Bool vertical ) { #if 1 PSH_Dimension dim = &glyph->globals->dimension[vertical]; FT_Fixed scale = dim->scale_mult; /* first technique: a point is strong if it is a local extrema */ { FT_UInt count = glyph->num_points; PSH2_Point point = glyph->points; for ( ; count > 0; count--, point++ ) { if ( psh2_point_is_strong(point) ) continue; /* sometimes, some local extremas are smooth points */ if ( psh2_point_is_smooth(point) ) { if ( point->dir_in == PSH2_DIR_NONE || point->dir_in != point->dir_out ) continue; if ( !psh2_point_is_extremum( point ) ) continue; point->flags &= ~PSH2_POINT_SMOOTH; } /* find best enclosing point coordinates */ { PSH2_Point before = 0; PSH2_Point after = 0; FT_Pos diff_before = -32000; FT_Pos diff_after = 32000; FT_Pos u = point->org_u; FT_Int count2 = glyph->num_points; PSH2_Point cur = glyph->points; for ( ; count2 > 0; count2--, cur++ ) { if ( psh2_point_is_strong(cur) ) { FT_Pos diff = cur->org_u - u;; if ( diff <= 0 ) { if ( diff > diff_before ) { diff_before = diff; before = cur; } } else if ( diff >= 0 ) { if ( diff < diff_after ) { diff_after = diff; after = cur; } } } } if ( !before ) { if ( !after ) continue; /* we're before the first strong point coordinate */ /* simply translate the point.. */ point->cur_u = after->cur_u + FT_MulFix( point->org_u - after->org_u, scale ); } else if ( !after ) { /* we're after the last strong point coordinate */ /* simply translate the point.. */ point->cur_u = before->cur_u + FT_MulFix( point->org_u - before->org_u, scale ); } else { if ( diff_before == 0 ) point->cur_u = before->cur_u; else if ( diff_after == 0 ) point->cur_u = after->cur_u; else point->cur_u = before->cur_u + FT_MulDiv( u - before->org_u, after->cur_u - before->cur_u, after->org_u - before->org_u ); } psh2_point_set_fitted(point); } } } #endif } /* interpolate other points */ static void psh2_glyph_interpolate_other_points( PSH2_Glyph glyph, FT_Bool vertical ) { PSH_Dimension dim = &glyph->globals->dimension[vertical]; FT_Fixed scale = dim->scale_mult; FT_Fixed delta = dim->scale_delta; PSH2_Contour contour = glyph->contours; FT_UInt num_contours = glyph->num_contours; for ( ; num_contours > 0; num_contours--, contour++ ) { PSH2_Point start = contour->start; PSH2_Point first, next, point; FT_UInt fit_count; /* count the number of strong points in this contour */ next = start + contour->count; fit_count = 0; first = 0; for ( point = start; point < next; point++ ) if ( psh2_point_is_fitted(point) ) { if ( !first ) first = point; fit_count++; } /* if there is less than 2 fitted points in the contour, we'll */ /* simply scale and eventually translate the contour points */ if ( fit_count < 2 ) { if ( fit_count == 1 ) delta = first->cur_u - FT_MulFix( first->org_u, scale ); for ( point = start; point < next; point++ ) if ( point != first ) point->cur_u = FT_MulFix( point->org_u, scale ) + delta; goto Next_Contour; } /* there are more than 2 strong points in this contour, we'll */ /* need to interpolate weak points between them.. */ start = first; do { point = first; /* skip consecutive fitted points */ for (;;) { next = first->next; if ( next == start ) goto Next_Contour; if ( !psh2_point_is_fitted(next) ) break; first = next; } /* find next fitted point after unfitted one */ for (;;) { next = next->next; if ( psh2_point_is_fitted(next) ) break; } /* now interpolate between them */ { FT_Pos org_a, org_ab, cur_a, cur_ab; FT_Pos org_c, org_ac, cur_c; FT_Fixed scale_ab; if ( first->org_u <= next->org_u ) { org_a = first->org_u; cur_a = first->cur_u; org_ab = next->org_u - org_a; cur_ab = next->cur_u - cur_a; } else { org_a = next->org_u; cur_a = next->cur_u; org_ab = first->org_u - org_a; cur_ab = first->cur_u - cur_a; } scale_ab = 0x10000L; if ( org_ab > 0 ) scale_ab = FT_DivFix( cur_ab, org_ab ); point = first->next; do { org_c = point->org_u; org_ac = org_c - org_a; if ( org_ac <= 0 ) { /* on the left of the interpolation zone */ cur_c = cur_a + FT_MulFix( org_ac, scale ); } else if ( org_ac >= org_ab ) { /* on the right on the interpolation zone */ cur_c = cur_a + cur_ab + FT_MulFix( org_ac - org_ab, scale ); } else { /* within the interpolation zone */ cur_c = cur_a + FT_MulFix( org_ac, scale_ab ); } point->cur_u = cur_c; point = point->next; } while ( point != next ); } /* keep going until all points in the contours have been processed */ first = next; } while ( first != start ); Next_Contour: ; } } /************************************************************************/ /************************************************************************/ /***** *****/ /***** HIGH-LEVEL INTERFACE *****/ /***** *****/ /************************************************************************/ /************************************************************************/ FT_Error ps2_hints_apply( PS_Hints ps_hints, FT_Outline* outline, PSH_Globals globals ) { PSH2_Glyph glyph; PSH2_GlyphRec glyphrec; FT_Error error; FT_Memory memory; FT_Int dimension; memory = globals->memory; #ifdef DEBUG_HINTER if ( ps2_debug_glyph ) { psh2_glyph_done( ps2_debug_glyph ); FREE( ps2_debug_glyph ); } if ( ALLOC( glyph, sizeof(*glyph) ) ) return error; ps2_debug_glyph = glyph; #else glyph = &glyphrec; #endif error = psh2_glyph_init( glyph, outline, ps_hints, globals ); if (error) goto Exit; for ( dimension = 1; dimension >= 0; dimension-- ) { /* load outline coordinates into glyph */ psh2_glyph_load_points( glyph, dimension ); /* compute aligned stem/hints positions */ psh2_hint_table_align_hints( &glyph->hint_tables[dimension], glyph->globals, dimension ); /* find strong points, align them, then interpolate others */ psh2_glyph_find_strong_points( glyph, dimension ); psh2_glyph_interpolate_strong_points( glyph, dimension ); psh2_glyph_interpolate_normal_points( glyph, dimension ); psh2_glyph_interpolate_other_points( glyph, dimension ); /* save hinted coordinates back to outline */ psh2_glyph_save_points( glyph, dimension ); } Exit: #ifndef DEBUG_HINTER psh2_glyph_done( glyph ); #endif return error; }