diff options
Diffstat (limited to 'src/pshinter/pshalgo1.c')
| -rw-r--r-- | src/pshinter/pshalgo1.c | 736 |
1 files changed, 736 insertions, 0 deletions
diff --git a/src/pshinter/pshalgo1.c b/src/pshinter/pshalgo1.c new file mode 100644 index 000000000..eaa82de3d --- /dev/null +++ b/src/pshinter/pshalgo1.c @@ -0,0 +1,736 @@ +#include <ft2build.h> +#include FT_INTERNAL_OBJECTS_H +#include FT_INTERNAL_DEBUG_H +#include "pshalgo1.h" + +#ifdef DEBUG_HINTER + extern PSH1_Hint_Table ps1_debug_hint_table = 0; + extern PSH1_HintFunc ps1_debug_hint_func = 0; +#endif + + /************************************************************************/ + /************************************************************************/ + /***** *****/ + /***** BASIC HINTS RECORDINGS *****/ + /***** *****/ + /************************************************************************/ + /************************************************************************/ + + /* return true iff two stem hints overlap */ + static FT_Int + psh1_hint_overlap( PSH1_Hint hint1, + PSH1_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 + psh1_hint_table_done( PSH1_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 + psh1_hint_table_deactivate( PSH1_Hint_Table table ) + { + FT_UInt count = table->max_hints; + PSH1_Hint hint = table->hints; + + for ( ; count > 0; count--, hint++ ) + { + psh1_hint_deactivate(hint); + hint->order = -1; + } + } + + + /* internal function used to record a new hint */ + static void + psh1_hint_table_record( PSH1_Hint_Table table, + FT_UInt index ) + { + PSH1_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 ( psh1_hint_is_active(hint) ) + return; + + psh1_hint_activate(hint); + + /* now scan the current active hint set in order to determine */ + /* if we're overlapping with another segment.. */ + { + PSH1_Hint* sorted = table->sort_global; + FT_UInt count = table->num_hints; + PSH1_Hint hint2; + + hint->parent = 0; + for ( ; count > 0; count--, sorted++ ) + { + hint2 = sorted[0]; + + if ( psh1_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 + psh1_hint_table_record_mask( PSH1_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 ) + psh1_hint_table_record( table, index ); + + mask >>= 1; + } + } + + + /* create hints table */ + static FT_Error + psh1_hint_table_init( PSH1_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, PSH1_Hint ) || + ALLOC_ARRAY( table->hints, count, PSH1_HintRec ) || + ALLOC_ARRAY( table->zones, 2*count+1, PSH1_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 */ + { + PSH1_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++ ) + psh1_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++ ) + psh1_hint_table_record( table, index ); + } + + Exit: + return error; + } + + + + static void + psh1_hint_table_activate_mask( PSH1_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; + + psh1_hint_table_deactivate( table ); + + for ( index = 0; index < limit; index++ ) + { + if ( mask == 0 ) + { + val = *cursor++; + mask = 0x80; + } + + if ( val & mask ) + { + PSH1_Hint hint = &table->hints[index]; + + if ( !psh1_hint_is_active(hint) ) + { + PSH1_Hint* sort = table->sort; + FT_UInt count2; + PSH1_Hint hint2; + + for ( count2 = count; count2 > 0; count2--, sort++ ) + { + hint2 = sort[0]; + if ( psh1_hint_overlap( hint, hint2 ) ) + { + FT_ERROR(( "%s.activate_mask: found overlapping hints\n", + "psf.hint" )); + break; + } + } + + if ( count2 == 0 ) + { + psh1_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; + PSH1_Hint hint1, hint2; + PSH1_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 + void + ps_simple_scale( PSH1_Hint_Table table, + FT_Fixed scale, + FT_Fixed delta, + FT_Bool vertical ) + { + PSH1_Hint hint; + FT_UInt count; + + for ( count = 0; count < table->num_hints; count++ ) + { + hint = table->sort[count]; + if ( psh1_hint_is_active(hint) ) + { + hint->cur_pos = FT_MulFix( hint->org_pos, scale ) + delta; + hint->cur_len = FT_MulFix( hint->org_len, scale ); + + if (ps1_debug_hint_func) + ps1_debug_hint_func( hint, vertical ); + } + } + } +#endif + + FT_LOCAL_DEF FT_Error + psh1_hint_table_optimize( PSH1_Hint_Table table, + PSH_Globals globals, + FT_Outline* outline, + FT_Bool vertical ) + { + PSH_Dimension dim = &globals->dimension[vertical]; + FT_Fixed scale = dim->scale_mult; + FT_Fixed delta = dim->scale_delta; + +#ifdef DEBUG_HINTER + if ( ps_debug_no_vert_hints && vertical ) + { + ps_simple_scale( table, scale, delta, vertical ); + return 0; + } + + if ( ps_debug_no_horz_hints && !vertical ) + { + ps_simple_scale( table, scale, delta, vertical ); + return 0; + } +#endif + + /* XXXX: for now, we only scale the hints to test all other aspects */ + /* of the Postscript Hinter.. */ + { + PSH1_Hint hint; + FT_UInt count; + + for ( count = 0; count < table->num_hints; count++ ) + { + hint = table->sort[count]; + if ( psh1_hint_is_active(hint) ) + { +# if 1 + 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 = 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: + /* 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); + } +# else + hint->cur_pos = (FT_MulFix( hint->org_pos, scale ) + delta + 32) & -64; + hint->cur_len = FT_MulFix( hint->org_len, scale ); +# endif + +#ifdef DEBUG_HINTER + if (ps1_debug_hint_func) + ps1_debug_hint_func( hint, vertical ); +#endif + } + } + } + + return 0; + } + + + + + /************************************************************************/ + /************************************************************************/ + /***** *****/ + /***** POINTS INTERPOLATION ROUTINES *****/ + /***** *****/ + /************************************************************************/ + /************************************************************************/ + +#define PSH1_ZONE_MIN -3200000 +#define PSH1_ZONE_MAX +3200000 + + +#define xxDEBUG_ZONES + +#ifdef DEBUG_ZONES + +#include <stdio.h> + + static void + print_zone( PSH1_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 + psh1_hint_table_setup_zones( PSH1_Hint_Table table, + FT_Fixed scale, + FT_Fixed delta ) + { + FT_UInt count; + PSH1_Zone zone; + PSH1_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 = PSH1_ZONE_MIN; + zone->max = PSH1_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 = PSH1_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 = PSH1_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 + psh1_hint_table_tune_coord( PSH1_Hint_Table table, + FT_Int coord ) + { + PSH1_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; + } + + + /* tune a given outline with current interpolation zones */ + /* the function only works in a single dimension.. */ + static void + psh1_hint_table_tune_outline( PSH1_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; + + psh1_hint_table_activate_mask( table, mask ); + psh1_hint_table_optimize( table, globals, outline, vertical ); + psh1_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 = psh1_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; + } + } + } + + + /************************************************************************/ + /************************************************************************/ + /***** *****/ + /***** HIGH-LEVEL INTERFACE *****/ + /***** *****/ + /************************************************************************/ + /************************************************************************/ + + FT_Error + ps1_hints_apply( PS_Hints ps_hints, + FT_Outline* outline, + PSH_Globals globals ) + { + PSH1_Hint_TableRec hints; + FT_Error error; + FT_Int dimension; + + for ( dimension = 1; dimension >= 0; dimension-- ) + { + PS_Dimension dim = &ps_hints->dimension[dimension]; + + /* initialise hints table */ + memset( &hints, 0, sizeof(hints) ); + error = psh1_hint_table_init( &hints, + &dim->hints, + &dim->masks, + &dim->counters, + ps_hints->memory ); + if (error) goto Exit; + + psh1_hint_table_tune_outline( &hints, + outline, + globals, + dimension ); + + psh1_hint_table_done( &hints, ps_hints->memory ); + } + + Exit: + return error; + } |