--- a/misc/libfreetype/src/pshinter/pshalgo.c Tue Jul 16 11:14:27 2013 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,2306 +0,0 @@
-/***************************************************************************/
-/* */
-/* pshalgo.c */
-/* */
-/* PostScript hinting algorithm (body). */
-/* */
-/* Copyright 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 */
-/* 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 <ft2build.h>
-#include FT_INTERNAL_OBJECTS_H
-#include FT_INTERNAL_DEBUG_H
-#include FT_INTERNAL_CALC_H
-#include "pshalgo.h"
-
-#include "pshnterr.h"
-
-
-#undef FT_COMPONENT
-#define FT_COMPONENT trace_pshalgo2
-
-
-#ifdef DEBUG_HINTER
- PSH_Hint_Table ps_debug_hint_table = 0;
- PSH_HintFunc ps_debug_hint_func = 0;
- PSH_Glyph ps_debug_glyph = 0;
-#endif
-
-
-#define COMPUTE_INFLEXS /* compute inflection points to optimize `S' */
- /* and similar glyphs */
-#define STRONGER /* slightly increase the contrast of smooth */
- /* hinting */
-
-
- /*************************************************************************/
- /*************************************************************************/
- /***** *****/
- /***** BASIC HINTS RECORDINGS *****/
- /***** *****/
- /*************************************************************************/
- /*************************************************************************/
-
- /* return true if two stem hints overlap */
- static FT_Int
- psh_hint_overlap( PSH_Hint hint1,
- PSH_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
- psh_hint_table_done( PSH_Hint_Table table,
- FT_Memory memory )
- {
- FT_FREE( table->zones );
- table->num_zones = 0;
- table->zone = 0;
-
- FT_FREE( table->sort );
- FT_FREE( table->hints );
- table->num_hints = 0;
- table->max_hints = 0;
- table->sort_global = 0;
- }
-
-
- /* deactivate all hints in a table */
- static void
- psh_hint_table_deactivate( PSH_Hint_Table table )
- {
- FT_UInt count = table->max_hints;
- PSH_Hint hint = table->hints;
-
-
- for ( ; count > 0; count--, hint++ )
- {
- psh_hint_deactivate( hint );
- hint->order = -1;
- }
- }
-
-
- /* internal function to record a new hint */
- static void
- psh_hint_table_record( PSH_Hint_Table table,
- FT_UInt idx )
- {
- PSH_Hint hint = table->hints + idx;
-
-
- if ( idx >= table->max_hints )
- {
- FT_TRACE0(( "psh_hint_table_record: invalid hint index %d\n", idx ));
- return;
- }
-
- /* ignore active hints */
- if ( psh_hint_is_active( hint ) )
- return;
-
- psh_hint_activate( hint );
-
- /* now scan the current active hint set to check */
- /* whether `hint' overlaps with another hint */
- {
- PSH_Hint* sorted = table->sort_global;
- FT_UInt count = table->num_hints;
- PSH_Hint hint2;
-
-
- hint->parent = 0;
- for ( ; count > 0; count--, sorted++ )
- {
- hint2 = sorted[0];
-
- if ( psh_hint_overlap( hint, hint2 ) )
- {
- hint->parent = hint2;
- break;
- }
- }
- }
-
- if ( table->num_hints < table->max_hints )
- table->sort_global[table->num_hints++] = hint;
- else
- FT_TRACE0(( "psh_hint_table_record: too many sorted hints! BUG!\n" ));
- }
-
-
- static void
- psh_hint_table_record_mask( PSH_Hint_Table table,
- PS_Mask hint_mask )
- {
- FT_Int mask = 0, val = 0;
- FT_Byte* cursor = hint_mask->bytes;
- FT_UInt idx, limit;
-
-
- limit = hint_mask->num_bits;
-
- for ( idx = 0; idx < limit; idx++ )
- {
- if ( mask == 0 )
- {
- val = *cursor++;
- mask = 0x80;
- }
-
- if ( val & mask )
- psh_hint_table_record( table, idx );
-
- mask >>= 1;
- }
- }
-
-
- /* create hints table */
- static FT_Error
- psh_hint_table_init( PSH_Hint_Table table,
- PS_Hint_Table hints,
- PS_Mask_Table hint_masks,
- PS_Mask_Table counter_masks,
- FT_Memory memory )
- {
- FT_UInt count;
- FT_Error error;
-
- FT_UNUSED( counter_masks );
-
-
- count = hints->num_hints;
-
- /* allocate our tables */
- if ( FT_NEW_ARRAY( table->sort, 2 * count ) ||
- FT_NEW_ARRAY( table->hints, count ) ||
- FT_NEW_ARRAY( table->zones, 2 * count + 1 ) )
- goto Exit;
-
- table->max_hints = count;
- table->sort_global = table->sort + count;
- table->num_hints = 0;
- table->num_zones = 0;
- table->zone = 0;
-
- /* initialize the `table->hints' array */
- {
- PSH_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 )
- {
- PS_Mask mask = hint_masks->masks;
-
-
- count = hint_masks->num_masks;
- table->hint_masks = hint_masks;
-
- for ( ; count > 0; count--, mask++ )
- psh_hint_table_record_mask( table, mask );
- }
-
- /* finally, do a linear parse in case some hints were left alone */
- if ( table->num_hints != table->max_hints )
- {
- FT_UInt idx;
-
-
- FT_TRACE0(( "psh_hint_table_init: missing/incorrect hint masks\n" ));
-
- count = table->max_hints;
- for ( idx = 0; idx < count; idx++ )
- psh_hint_table_record( table, idx );
- }
-
- Exit:
- return error;
- }
-
-
- static void
- psh_hint_table_activate_mask( PSH_Hint_Table table,
- PS_Mask hint_mask )
- {
- FT_Int mask = 0, val = 0;
- FT_Byte* cursor = hint_mask->bytes;
- FT_UInt idx, limit, count;
-
-
- limit = hint_mask->num_bits;
- count = 0;
-
- psh_hint_table_deactivate( table );
-
- for ( idx = 0; idx < limit; idx++ )
- {
- if ( mask == 0 )
- {
- val = *cursor++;
- mask = 0x80;
- }
-
- if ( val & mask )
- {
- PSH_Hint hint = &table->hints[idx];
-
-
- if ( !psh_hint_is_active( hint ) )
- {
- FT_UInt count2;
-
-#if 0
- PSH_Hint* sort = table->sort;
- PSH_Hint hint2;
-
-
- for ( count2 = count; count2 > 0; count2--, sort++ )
- {
- hint2 = sort[0];
- if ( psh_hint_overlap( hint, hint2 ) )
- FT_TRACE0(( "psh_hint_table_activate_mask:"
- " found overlapping hints\n" ))
- }
-#else
- count2 = 0;
-#endif
-
- if ( count2 == 0 )
- {
- psh_hint_activate( hint );
- if ( count < table->max_hints )
- table->sort[count++] = hint;
- else
- FT_TRACE0(( "psh_hint_tableactivate_mask:"
- " too many active hints\n" ));
- }
- }
- }
-
- mask >>= 1;
- }
- table->num_hints = count;
-
- /* now, sort the hints; they are guaranteed to not overlap */
- /* so we can compare their "org_pos" field directly */
- {
- FT_Int i1, i2;
- PSH_Hint hint1, hint2;
- PSH_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[i2 + 1] = hint2;
- sort[i2] = hint1;
- }
- }
- }
- }
-
-
- /*************************************************************************/
- /*************************************************************************/
- /***** *****/
- /***** HINTS GRID-FITTING AND OPTIMIZATION *****/
- /***** *****/
- /*************************************************************************/
- /*************************************************************************/
-
-#if 1
- static FT_Pos
- psh_dimension_quantize_len( PSH_Dimension dim,
- FT_Pos len,
- FT_Bool do_snapping )
- {
- if ( len <= 64 )
- len = 64;
- else
- {
- FT_Pos delta = len - dim->stdw.widths[0].cur;
-
-
- if ( delta < 0 )
- delta = -delta;
-
- if ( delta < 40 )
- {
- len = dim->stdw.widths[0].cur;
- if ( len < 48 )
- len = 48;
- }
-
- if ( len < 3 * 64 )
- {
- delta = ( len & 63 );
- len &= -64;
-
- if ( delta < 10 )
- len += delta;
-
- else if ( delta < 32 )
- len += 10;
-
- else if ( delta < 54 )
- len += 54;
-
- else
- len += delta;
- }
- else
- len = FT_PIX_ROUND( len );
- }
-
- if ( do_snapping )
- len = FT_PIX_ROUND( len );
-
- return len;
- }
-#endif /* 0 */
-
-
-#ifdef DEBUG_HINTER
-
- static void
- ps_simple_scale( PSH_Hint_Table table,
- FT_Fixed scale,
- FT_Fixed delta,
- FT_Int dimension )
- {
- PSH_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 ( ps_debug_hint_func )
- ps_debug_hint_func( hint, dimension );
- }
- }
-
-#endif /* DEBUG_HINTER */
-
-
- static FT_Fixed
- psh_hint_snap_stem_side_delta( FT_Fixed pos,
- FT_Fixed len )
- {
- FT_Fixed delta1 = FT_PIX_ROUND( pos ) - pos;
- FT_Fixed delta2 = FT_PIX_ROUND( pos + len ) - pos - len;
-
-
- if ( FT_ABS( delta1 ) <= FT_ABS( delta2 ) )
- return delta1;
- else
- return delta2;
- }
-
-
- static void
- psh_hint_align( PSH_Hint hint,
- PSH_Globals globals,
- FT_Int dimension,
- PSH_Glyph glyph )
- {
- PSH_Dimension dim = &globals->dimension[dimension];
- FT_Fixed scale = dim->scale_mult;
- FT_Fixed delta = dim->scale_delta;
-
-
- if ( !psh_hint_is_fitted( hint ) )
- {
- FT_Pos pos = FT_MulFix( hint->org_pos, scale ) + delta;
- FT_Pos len = FT_MulFix( hint->org_len, scale );
-
- FT_Int do_snapping;
- FT_Pos fit_len;
- PSH_AlignmentRec align;
-
-
- /* ignore stem alignments when requested through the hint flags */
- if ( ( dimension == 0 && !glyph->do_horz_hints ) ||
- ( dimension == 1 && !glyph->do_vert_hints ) )
- {
- hint->cur_pos = pos;
- hint->cur_len = len;
-
- psh_hint_set_fitted( hint );
- return;
- }
-
- /* perform stem snapping when requested - this is necessary
- * for monochrome and LCD hinting modes only
- */
- do_snapping = ( dimension == 0 && glyph->do_horz_snapping ) ||
- ( dimension == 1 && glyph->do_vert_snapping );
-
- hint->cur_len = fit_len = len;
-
- /* check blue zones for horizontal stems */
- align.align = PSH_BLUE_ALIGN_NONE;
- align.align_bot = align.align_top = 0;
-
- if ( dimension == 1 )
- 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:
- {
- PSH_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 ( !psh_hint_is_fitted( parent ) )
- psh_hint_align( parent, globals, dimension, glyph );
-
- /* keep original relation between hints, this is, use the */
- /* scaled distance between the centers of the hints to */
- /* compute the new position */
- par_org_center = parent->org_pos + ( parent->org_len >> 1 );
- par_cur_center = parent->cur_pos + ( parent->cur_len >> 1 );
- cur_org_center = hint->org_pos + ( hint->org_len >> 1 );
-
- cur_delta = FT_MulFix( cur_org_center - par_org_center, scale );
- pos = par_cur_center + cur_delta - ( len >> 1 );
- }
-
- hint->cur_pos = pos;
- hint->cur_len = fit_len;
-
- /* Stem adjustment tries to snap stem widths to standard
- * ones. This is important to prevent unpleasant rounding
- * artefacts.
- */
- if ( glyph->do_stem_adjust )
- {
- if ( len <= 64 )
- {
- /* the stem is less than one pixel; we will center it
- * around the nearest pixel center
- */
- if ( len >= 32 )
- {
- /* This is a special case where we also widen the stem
- * and align it to the pixel grid.
- *
- * stem_center = pos + (len/2)
- * nearest_pixel_center = FT_ROUND(stem_center-32)+32
- * new_pos = nearest_pixel_center-32
- * = FT_ROUND(stem_center-32)
- * = FT_FLOOR(stem_center-32+32)
- * = FT_FLOOR(stem_center)
- * new_len = 64
- */
- pos = FT_PIX_FLOOR( pos + ( len >> 1 ) );
- len = 64;
- }
- else if ( len > 0 )
- {
- /* This is a very small stem; we simply align it to the
- * pixel grid, trying to find the minimal displacement.
- *
- * left = pos
- * right = pos + len
- * left_nearest_edge = ROUND(pos)
- * right_nearest_edge = ROUND(right)
- *
- * if ( ABS(left_nearest_edge - left) <=
- * ABS(right_nearest_edge - right) )
- * new_pos = left
- * else
- * new_pos = right
- */
- FT_Pos left_nearest = FT_PIX_ROUND( pos );
- FT_Pos right_nearest = FT_PIX_ROUND( pos + len );
- FT_Pos left_disp = left_nearest - pos;
- FT_Pos right_disp = right_nearest - ( pos + len );
-
-
- if ( left_disp < 0 )
- left_disp = -left_disp;
- if ( right_disp < 0 )
- right_disp = -right_disp;
- if ( left_disp <= right_disp )
- pos = left_nearest;
- else
- pos = right_nearest;
- }
- else
- {
- /* this is a ghost stem; we simply round it */
- pos = FT_PIX_ROUND( pos );
- }
- }
- else
- {
- len = psh_dimension_quantize_len( dim, len, 0 );
- }
- }
-
- /* now that we have a good hinted stem width, try to position */
- /* the stem along a pixel grid integer coordinate */
- hint->cur_pos = pos + psh_hint_snap_stem_side_delta( pos, len );
- hint->cur_len = len;
- }
- }
-
- if ( do_snapping )
- {
- pos = hint->cur_pos;
- len = hint->cur_len;
-
- if ( len < 64 )
- len = 64;
- else
- len = FT_PIX_ROUND( len );
-
- switch ( align.align )
- {
- case PSH_BLUE_ALIGN_TOP:
- hint->cur_pos = align.align_top - len;
- hint->cur_len = len;
- break;
-
- case PSH_BLUE_ALIGN_BOT:
- hint->cur_len = len;
- break;
-
- case PSH_BLUE_ALIGN_BOT | PSH_BLUE_ALIGN_TOP:
- /* don't touch */
- break;
-
-
- default:
- hint->cur_len = len;
- if ( len & 64 )
- pos = FT_PIX_FLOOR( pos + ( len >> 1 ) ) + 32;
- else
- pos = FT_PIX_ROUND( pos + ( len >> 1 ) );
-
- hint->cur_pos = pos - ( len >> 1 );
- hint->cur_len = len;
- }
- }
-
- psh_hint_set_fitted( hint );
-
-#ifdef DEBUG_HINTER
- if ( ps_debug_hint_func )
- ps_debug_hint_func( hint, dimension );
-#endif
- }
- }
-
-
-#if 0 /* not used for now, experimental */
-
- /*
- * A variant to perform "light" hinting (i.e. FT_RENDER_MODE_LIGHT)
- * of stems
- */
- static void
- psh_hint_align_light( PSH_Hint hint,
- PSH_Globals globals,
- FT_Int dimension,
- PSH_Glyph glyph )
- {
- PSH_Dimension dim = &globals->dimension[dimension];
- FT_Fixed scale = dim->scale_mult;
- FT_Fixed delta = dim->scale_delta;
-
-
- if ( !psh_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_len;
-
- PSH_AlignmentRec align;
-
-
- /* ignore stem alignments when requested through the hint flags */
- if ( ( dimension == 0 && !glyph->do_horz_hints ) ||
- ( dimension == 1 && !glyph->do_vert_hints ) )
- {
- hint->cur_pos = pos;
- hint->cur_len = len;
-
- psh_hint_set_fitted( hint );
- return;
- }
-
- fit_len = len;
-
- hint->cur_len = fit_len;
-
- /* check blue zones for horizontal stems */
- align.align = PSH_BLUE_ALIGN_NONE;
- align.align_bot = align.align_top = 0;
-
- if ( dimension == 1 )
- 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:
- {
- PSH_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 ( !psh_hint_is_fitted( parent ) )
- psh_hint_align_light( parent, globals, dimension, glyph );
-
- 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 );
- pos = par_cur_center + cur_delta - ( len >> 1 );
- }
-
- /* Stems less than one pixel wide are easy -- we want to
- * make them as dark as possible, so they must fall within
- * one pixel. If the stem is split between two pixels
- * then snap the edge that is nearer to the pixel boundary
- * to the pixel boundary.
- */
- if ( len <= 64 )
- {
- if ( ( pos + len + 63 ) / 64 != pos / 64 + 1 )
- pos += psh_hint_snap_stem_side_delta ( pos, len );
- }
-
- /* Position stems other to minimize the amount of mid-grays.
- * There are, in general, two positions that do this,
- * illustrated as A) and B) below.
- *
- * + + + +
- *
- * A) |--------------------------------|
- * B) |--------------------------------|
- * C) |--------------------------------|
- *
- * Position A) (split the excess stem equally) should be better
- * for stems of width N + f where f < 0.5.
- *
- * Position B) (split the deficiency equally) should be better
- * for stems of width N + f where f > 0.5.
- *
- * It turns out though that minimizing the total number of lit
- * pixels is also important, so position C), with one edge
- * aligned with a pixel boundary is actually preferable
- * to A). There are also more possibile positions for C) than
- * for A) or B), so it involves less distortion of the overall
- * character shape.
- */
- else /* len > 64 */
- {
- FT_Fixed frac_len = len & 63;
- FT_Fixed center = pos + ( len >> 1 );
- FT_Fixed delta_a, delta_b;
-
-
- if ( ( len / 64 ) & 1 )
- {
- delta_a = FT_PIX_FLOOR( center ) + 32 - center;
- delta_b = FT_PIX_ROUND( center ) - center;
- }
- else
- {
- delta_a = FT_PIX_ROUND( center ) - center;
- delta_b = FT_PIX_FLOOR( center ) + 32 - center;
- }
-
- /* We choose between B) and C) above based on the amount
- * of fractinal stem width; for small amounts, choose
- * C) always, for large amounts, B) always, and inbetween,
- * pick whichever one involves less stem movement.
- */
- if ( frac_len < 32 )
- {
- pos += psh_hint_snap_stem_side_delta ( pos, len );
- }
- else if ( frac_len < 48 )
- {
- FT_Fixed side_delta = psh_hint_snap_stem_side_delta ( pos,
- len );
-
- if ( FT_ABS( side_delta ) < FT_ABS( delta_b ) )
- pos += side_delta;
- else
- pos += delta_b;
- }
- else
- {
- pos += delta_b;
- }
- }
-
- hint->cur_pos = pos;
- }
- } /* switch */
-
- psh_hint_set_fitted( hint );
-
-#ifdef DEBUG_HINTER
- if ( ps_debug_hint_func )
- ps_debug_hint_func( hint, dimension );
-#endif
- }
- }
-
-#endif /* 0 */
-
-
- static void
- psh_hint_table_align_hints( PSH_Hint_Table table,
- PSH_Globals globals,
- FT_Int dimension,
- PSH_Glyph glyph )
- {
- PSH_Hint hint;
- FT_UInt count;
-
-#ifdef DEBUG_HINTER
-
- PSH_Dimension dim = &globals->dimension[dimension];
- FT_Fixed scale = dim->scale_mult;
- FT_Fixed delta = dim->scale_delta;
-
-
- if ( ps_debug_no_vert_hints && dimension == 0 )
- {
- ps_simple_scale( table, scale, delta, dimension );
- return;
- }
-
- if ( ps_debug_no_horz_hints && dimension == 1 )
- {
- ps_simple_scale( table, scale, delta, dimension );
- return;
- }
-
-#endif /* DEBUG_HINTER*/
-
- hint = table->hints;
- count = table->max_hints;
-
- for ( ; count > 0; count--, hint++ )
- psh_hint_align( hint, globals, dimension, glyph );
- }
-
-
- /*************************************************************************/
- /*************************************************************************/
- /***** *****/
- /***** POINTS INTERPOLATION ROUTINES *****/
- /***** *****/
- /*************************************************************************/
- /*************************************************************************/
-
-#define PSH_ZONE_MIN -3200000L
-#define PSH_ZONE_MAX +3200000L
-
-#define xxDEBUG_ZONES
-
-
-#ifdef DEBUG_ZONES
-
-#include FT_CONFIG_STANDARD_LIBRARY_H
-
- static void
- psh_print_zone( PSH_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 psh_print_zone( x ) do { } while ( 0 )
-
-#endif /* DEBUG_ZONES */
-
-
- /*************************************************************************/
- /*************************************************************************/
- /***** *****/
- /***** HINTER GLYPH MANAGEMENT *****/
- /***** *****/
- /*************************************************************************/
- /*************************************************************************/
-
-#if 1
-
-#define psh_corner_is_flat ft_corner_is_flat
-#define psh_corner_orientation ft_corner_orientation
-
-#else
-
- FT_LOCAL_DEF( FT_Int )
- psh_corner_is_flat( FT_Pos x_in,
- FT_Pos y_in,
- FT_Pos x_out,
- FT_Pos y_out )
- {
- FT_Pos ax = x_in;
- FT_Pos ay = y_in;
-
- FT_Pos d_in, d_out, d_corner;
-
-
- if ( ax < 0 )
- ax = -ax;
- if ( ay < 0 )
- ay = -ay;
- d_in = ax + ay;
-
- ax = x_out;
- if ( ax < 0 )
- ax = -ax;
- ay = y_out;
- if ( ay < 0 )
- ay = -ay;
- d_out = ax + ay;
-
- ax = x_out + x_in;
- if ( ax < 0 )
- ax = -ax;
- ay = y_out + y_in;
- if ( ay < 0 )
- ay = -ay;
- d_corner = ax + ay;
-
- return ( d_in + d_out - d_corner ) < ( d_corner >> 4 );
- }
-
- static FT_Int
- psh_corner_orientation( FT_Pos in_x,
- FT_Pos in_y,
- FT_Pos out_x,
- FT_Pos out_y )
- {
- FT_Int result;
-
-
- /* deal with the trivial cases quickly */
- if ( in_y == 0 )
- {
- if ( in_x >= 0 )
- result = out_y;
- else
- result = -out_y;
- }
- else if ( in_x == 0 )
- {
- if ( in_y >= 0 )
- result = -out_x;
- else
- result = out_x;
- }
- else if ( out_y == 0 )
- {
- if ( out_x >= 0 )
- result = in_y;
- else
- result = -in_y;
- }
- else if ( out_x == 0 )
- {
- if ( out_y >= 0 )
- result = -in_x;
- else
- result = in_x;
- }
- else /* general case */
- {
- long long delta = (long long)in_x * out_y - (long long)in_y * out_x;
-
- if ( delta == 0 )
- result = 0;
- else
- result = 1 - 2 * ( delta < 0 );
- }
-
- return result;
- }
-
-#endif /* !1 */
-
-
-#ifdef COMPUTE_INFLEXS
-
- /* compute all inflex points in a given glyph */
- static void
- psh_glyph_compute_inflections( PSH_Glyph glyph )
- {
- FT_UInt n;
-
-
- for ( n = 0; n < glyph->num_contours; n++ )
- {
- PSH_Point first, start, end, before, after;
- FT_Pos in_x, in_y, out_x, out_y;
- FT_Int orient_prev, orient_cur;
- FT_Int finished = 0;
-
-
- /* we need at least 4 points to create an inflection point */
- if ( glyph->contours[n].count < 4 )
- continue;
-
- /* compute first segment in contour */
- first = glyph->contours[n].start;
-
- start = end = first;
- do
- {
- end = end->next;
- if ( end == first )
- goto Skip;
-
- in_x = end->org_u - start->org_u;
- in_y = end->org_v - start->org_v;
-
- } while ( in_x == 0 && in_y == 0 );
-
- /* extend the segment start whenever possible */
- before = start;
- do
- {
- do
- {
- start = before;
- before = before->prev;
- if ( before == first )
- goto Skip;
-
- out_x = start->org_u - before->org_u;
- out_y = start->org_v - before->org_v;
-
- } while ( out_x == 0 && out_y == 0 );
-
- orient_prev = psh_corner_orientation( in_x, in_y, out_x, out_y );
-
- } while ( orient_prev == 0 );
-
- first = start;
- in_x = out_x;
- in_y = out_y;
-
- /* now, process all segments in the contour */
- do
- {
- /* first, extend current segment's end whenever possible */
- after = end;
- do
- {
- do
- {
- end = after;
- after = after->next;
- if ( after == first )
- finished = 1;
-
- out_x = after->org_u - end->org_u;
- out_y = after->org_v - end->org_v;
-
- } while ( out_x == 0 && out_y == 0 );
-
- orient_cur = psh_corner_orientation( in_x, in_y, out_x, out_y );
-
- } while ( orient_cur == 0 );
-
- if ( ( orient_cur ^ orient_prev ) < 0 )
- {
- do
- {
- psh_point_set_inflex( start );
- start = start->next;
- }
- while ( start != end );
-
- psh_point_set_inflex( start );
- }
-
- start = end;
- end = after;
- orient_prev = orient_cur;
- in_x = out_x;
- in_y = out_y;
-
- } while ( !finished );
-
- Skip:
- ;
- }
- }
-
-#endif /* COMPUTE_INFLEXS */
-
-
- static void
- psh_glyph_done( PSH_Glyph glyph )
- {
- FT_Memory memory = glyph->memory;
-
-
- psh_hint_table_done( &glyph->hint_tables[1], memory );
- psh_hint_table_done( &glyph->hint_tables[0], memory );
-
- FT_FREE( glyph->points );
- FT_FREE( glyph->contours );
-
- glyph->num_points = 0;
- glyph->num_contours = 0;
-
- glyph->memory = 0;
- }
-
-
- static int
- psh_compute_dir( FT_Pos dx,
- FT_Pos dy )
- {
- FT_Pos ax, ay;
- int result = PSH_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 ) ? PSH_DIR_RIGHT : PSH_DIR_LEFT;
- }
- else if ( ax * 12 < ay )
- {
- /* |dx| <<< |dy| means a near-vertical segment */
- result = ( dy >= 0 ) ? PSH_DIR_UP : PSH_DIR_DOWN;
- }
-
- return result;
- }
-
-
- /* load outline point coordinates into hinter glyph */
- static void
- psh_glyph_load_points( PSH_Glyph glyph,
- FT_Int dimension )
- {
- FT_Vector* vec = glyph->outline->points;
- PSH_Point point = glyph->points;
- FT_UInt count = glyph->num_points;
-
-
- for ( ; count > 0; count--, point++, vec++ )
- {
- point->flags2 = 0;
- point->hint = NULL;
- if ( dimension == 0 )
- {
- point->org_u = vec->x;
- point->org_v = vec->y;
- }
- else
- {
- point->org_u = vec->y;
- point->org_v = vec->x;
- }
-
-#ifdef DEBUG_HINTER
- point->org_x = vec->x;
- point->org_y = vec->y;
-#endif
-
- }
- }
-
-
- /* save hinted point coordinates back to outline */
- static void
- psh_glyph_save_points( PSH_Glyph glyph,
- FT_Int dimension )
- {
- FT_UInt n;
- PSH_Point point = glyph->points;
- FT_Vector* vec = glyph->outline->points;
- char* tags = glyph->outline->tags;
-
-
- for ( n = 0; n < glyph->num_points; n++ )
- {
- if ( dimension == 0 )
- vec[n].x = point->cur_u;
- else
- vec[n].y = point->cur_u;
-
- if ( psh_point_is_strong( point ) )
- tags[n] |= (char)( ( dimension == 0 ) ? 32 : 64 );
-
-#ifdef DEBUG_HINTER
-
- if ( dimension == 0 )
- {
- point->cur_x = point->cur_u;
- point->flags_x = point->flags2 | point->flags;
- }
- else
- {
- point->cur_y = point->cur_u;
- point->flags_y = point->flags2 | point->flags;
- }
-
-#endif
-
- point++;
- }
- }
-
-
- static FT_Error
- psh_glyph_init( PSH_Glyph glyph,
- FT_Outline* outline,
- PS_Hints ps_hints,
- PSH_Globals globals )
- {
- FT_Error error;
- FT_Memory memory;
-
-
- /* clear all fields */
- FT_MEM_ZERO( glyph, sizeof ( *glyph ) );
-
- memory = glyph->memory = globals->memory;
-
- /* allocate and setup points + contours arrays */
- if ( FT_NEW_ARRAY( glyph->points, outline->n_points ) ||
- FT_NEW_ARRAY( glyph->contours, outline->n_contours ) )
- goto Exit;
-
- glyph->num_points = outline->n_points;
- glyph->num_contours = outline->n_contours;
-
- {
- FT_UInt first = 0, next, n;
- PSH_Point points = glyph->points;
- PSH_Contour contour = glyph->contours;
-
-
- for ( n = 0; n < glyph->num_contours; n++ )
- {
- FT_Int count;
- PSH_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;
- }
- }
-
- {
- PSH_Point points = glyph->points;
- PSH_Point point = points;
- FT_Vector* vec = outline->points;
- FT_UInt n;
-
-
- for ( n = 0; n < glyph->num_points; n++, point++ )
- {
- FT_Int n_prev = (FT_Int)( point->prev - points );
- FT_Int n_next = (FT_Int)( point->next - points );
- FT_Pos dxi, dyi, dxo, dyo;
-
-
- if ( !( outline->tags[n] & FT_CURVE_TAG_ON ) )
- point->flags = PSH_POINT_OFF;
-
- dxi = vec[n].x - vec[n_prev].x;
- dyi = vec[n].y - vec[n_prev].y;
-
- point->dir_in = (FT_Char)psh_compute_dir( dxi, dyi );
-
- dxo = vec[n_next].x - vec[n].x;
- dyo = vec[n_next].y - vec[n].y;
-
- point->dir_out = (FT_Char)psh_compute_dir( dxo, dyo );
-
- /* detect smooth points */
- if ( point->flags & PSH_POINT_OFF )
- point->flags |= PSH_POINT_SMOOTH;
-
- else if ( point->dir_in == point->dir_out )
- {
- if ( point->dir_out != PSH_DIR_NONE ||
- psh_corner_is_flat( dxi, dyi, dxo, dyo ) )
- point->flags |= PSH_POINT_SMOOTH;
- }
- }
- }
-
- glyph->outline = outline;
- glyph->globals = globals;
-
-#ifdef COMPUTE_INFLEXS
- psh_glyph_load_points( glyph, 0 );
- psh_glyph_compute_inflections( glyph );
-#endif /* COMPUTE_INFLEXS */
-
- /* now deal with hints tables */
- error = psh_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 = psh_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;
- }
-
-
- /* compute all extrema in a glyph for a given dimension */
- static void
- psh_glyph_compute_extrema( PSH_Glyph glyph )
- {
- FT_UInt n;
-
-
- /* first of all, compute all local extrema */
- for ( n = 0; n < glyph->num_contours; n++ )
- {
- PSH_Point first = glyph->contours[n].start;
- PSH_Point point, before, after;
-
-
- if ( glyph->contours[n].count == 0 )
- continue;
-
- point = first;
- before = point;
- after = point;
-
- do
- {
- before = before->prev;
- if ( before == first )
- goto Skip;
-
- } while ( before->org_u == point->org_u );
-
- first = point = before->next;
-
- for (;;)
- {
- after = point;
- do
- {
- after = after->next;
- if ( after == first )
- goto Next;
-
- } while ( after->org_u == point->org_u );
-
- if ( before->org_u < point->org_u )
- {
- if ( after->org_u < point->org_u )
- {
- /* local maximum */
- goto Extremum;
- }
- }
- else /* before->org_u > point->org_u */
- {
- if ( after->org_u > point->org_u )
- {
- /* local minimum */
- Extremum:
- do
- {
- psh_point_set_extremum( point );
- point = point->next;
-
- } while ( point != after );
- }
- }
-
- before = after->prev;
- point = after;
-
- } /* for */
-
- Next:
- ;
- }
-
- /* for each extremum, determine its direction along the */
- /* orthogonal axis */
- for ( n = 0; n < glyph->num_points; n++ )
- {
- PSH_Point point, before, after;
-
-
- point = &glyph->points[n];
- before = point;
- after = point;
-
- if ( psh_point_is_extremum( point ) )
- {
- do
- {
- before = before->prev;
- if ( before == point )
- goto Skip;
-
- } while ( before->org_v == point->org_v );
-
- do
- {
- after = after->next;
- if ( after == point )
- goto Skip;
-
- } while ( after->org_v == point->org_v );
- }
-
- if ( before->org_v < point->org_v &&
- after->org_v > point->org_v )
- {
- psh_point_set_positive( point );
- }
- else if ( before->org_v > point->org_v &&
- after->org_v < point->org_v )
- {
- psh_point_set_negative( point );
- }
-
- Skip:
- ;
- }
- }
-
-
- /* major_dir is the direction for points on the bottom/left of the stem; */
- /* Points on the top/right of the stem will have a direction of */
- /* -major_dir. */
-
- static void
- psh_hint_table_find_strong_points( PSH_Hint_Table table,
- PSH_Point point,
- FT_UInt count,
- FT_Int threshold,
- FT_Int major_dir )
- {
- PSH_Hint* sort = table->sort;
- FT_UInt num_hints = table->num_hints;
-
-
- for ( ; count > 0; count--, point++ )
- {
- FT_Int point_dir = 0;
- FT_Pos org_u = point->org_u;
-
-
- if ( psh_point_is_strong( point ) )
- continue;
-
- if ( PSH_DIR_COMPARE( point->dir_in, major_dir ) )
- point_dir = point->dir_in;
-
- else if ( PSH_DIR_COMPARE( point->dir_out, major_dir ) )
- point_dir = point->dir_out;
-
- if ( point_dir )
- {
- if ( point_dir == major_dir )
- {
- FT_UInt nn;
-
-
- for ( nn = 0; nn < num_hints; nn++ )
- {
- PSH_Hint hint = sort[nn];
- FT_Pos d = org_u - hint->org_pos;
-
-
- if ( d < threshold && -d < threshold )
- {
- psh_point_set_strong( point );
- point->flags2 |= PSH_POINT_EDGE_MIN;
- point->hint = hint;
- break;
- }
- }
- }
- else if ( point_dir == -major_dir )
- {
- FT_UInt nn;
-
-
- for ( nn = 0; nn < num_hints; nn++ )
- {
- PSH_Hint hint = sort[nn];
- FT_Pos d = org_u - hint->org_pos - hint->org_len;
-
-
- if ( d < threshold && -d < threshold )
- {
- psh_point_set_strong( point );
- point->flags2 |= PSH_POINT_EDGE_MAX;
- point->hint = hint;
- break;
- }
- }
- }
- }
-
-#if 1
- else if ( psh_point_is_extremum( point ) )
- {
- /* treat extrema as special cases for stem edge alignment */
- FT_UInt nn, min_flag, max_flag;
-
-
- if ( major_dir == PSH_DIR_HORIZONTAL )
- {
- min_flag = PSH_POINT_POSITIVE;
- max_flag = PSH_POINT_NEGATIVE;
- }
- else
- {
- min_flag = PSH_POINT_NEGATIVE;
- max_flag = PSH_POINT_POSITIVE;
- }
-
- if ( point->flags2 & min_flag )
- {
- for ( nn = 0; nn < num_hints; nn++ )
- {
- PSH_Hint hint = sort[nn];
- FT_Pos d = org_u - hint->org_pos;
-
-
- if ( d < threshold && -d < threshold )
- {
- point->flags2 |= PSH_POINT_EDGE_MIN;
- point->hint = hint;
- psh_point_set_strong( point );
- break;
- }
- }
- }
- else if ( point->flags2 & max_flag )
- {
- for ( nn = 0; nn < num_hints; nn++ )
- {
- PSH_Hint hint = sort[nn];
- FT_Pos d = org_u - hint->org_pos - hint->org_len;
-
-
- if ( d < threshold && -d < threshold )
- {
- point->flags2 |= PSH_POINT_EDGE_MAX;
- point->hint = hint;
- psh_point_set_strong( point );
- break;
- }
- }
- }
-
- if ( point->hint == NULL )
- {
- for ( nn = 0; nn < num_hints; nn++ )
- {
- PSH_Hint hint = sort[nn];
-
-
- if ( org_u >= hint->org_pos &&
- org_u <= hint->org_pos + hint->org_len )
- {
- point->hint = hint;
- break;
- }
- }
- }
- }
-
-#endif /* 1 */
- }
- }
-
-
- /* the accepted shift for strong points in fractional pixels */
-#define PSH_STRONG_THRESHOLD 32
-
- /* the maximum shift value in font units */
-#define PSH_STRONG_THRESHOLD_MAXIMUM 30
-
-
- /* find strong points in a glyph */
- static void
- psh_glyph_find_strong_points( PSH_Glyph glyph,
- FT_Int dimension )
- {
- /* a point is `strong' if it is located on a stem edge and */
- /* has an `in' or `out' tangent parallel to the hint's direction */
-
- PSH_Hint_Table table = &glyph->hint_tables[dimension];
- PS_Mask mask = table->hint_masks->masks;
- FT_UInt num_masks = table->hint_masks->num_masks;
- FT_UInt first = 0;
- FT_Int major_dir = dimension == 0 ? PSH_DIR_VERTICAL
- : PSH_DIR_HORIZONTAL;
- PSH_Dimension dim = &glyph->globals->dimension[dimension];
- FT_Fixed scale = dim->scale_mult;
- FT_Int threshold;
-
-
- threshold = (FT_Int)FT_DivFix( PSH_STRONG_THRESHOLD, scale );
- if ( threshold > PSH_STRONG_THRESHOLD_MAXIMUM )
- threshold = PSH_STRONG_THRESHOLD_MAXIMUM;
-
- /* process secondary hints to `selected' points */
- if ( num_masks > 1 && glyph->num_points > 0 )
- {
- /* the `endchar' op can reduce the number of points */
- first = mask->end_point > glyph->num_points
- ? glyph->num_points
- : mask->end_point;
- mask++;
- for ( ; num_masks > 1; num_masks--, mask++ )
- {
- FT_UInt next;
- FT_Int count;
-
-
- next = mask->end_point > glyph->num_points
- ? glyph->num_points
- : mask->end_point;
- count = next - first;
- if ( count > 0 )
- {
- PSH_Point point = glyph->points + first;
-
-
- psh_hint_table_activate_mask( table, mask );
-
- psh_hint_table_find_strong_points( table, point, count,
- threshold, major_dir );
- }
- first = next;
- }
- }
-
- /* process primary hints for all points */
- if ( num_masks == 1 )
- {
- FT_UInt count = glyph->num_points;
- PSH_Point point = glyph->points;
-
-
- psh_hint_table_activate_mask( table, table->hint_masks->masks );
-
- psh_hint_table_find_strong_points( table, point, count,
- threshold, major_dir );
- }
-
- /* now, certain points may have been attached to a hint and */
- /* not marked as strong; update their flags then */
- {
- FT_UInt count = glyph->num_points;
- PSH_Point point = glyph->points;
-
-
- for ( ; count > 0; count--, point++ )
- if ( point->hint && !psh_point_is_strong( point ) )
- psh_point_set_strong( point );
- }
- }
-
-
- /* find points in a glyph which are in a blue zone and have `in' or */
- /* `out' tangents parallel to the horizontal axis */
- static void
- psh_glyph_find_blue_points( PSH_Blues blues,
- PSH_Glyph glyph )
- {
- PSH_Blue_Table table;
- PSH_Blue_Zone zone;
- FT_UInt glyph_count = glyph->num_points;
- FT_UInt blue_count;
- PSH_Point point = glyph->points;
-
-
- for ( ; glyph_count > 0; glyph_count--, point++ )
- {
- FT_Pos y;
-
-
- /* check tangents */
- if ( !PSH_DIR_COMPARE( point->dir_in, PSH_DIR_HORIZONTAL ) &&
- !PSH_DIR_COMPARE( point->dir_out, PSH_DIR_HORIZONTAL ) )
- continue;
-
- /* skip strong points */
- if ( psh_point_is_strong( point ) )
- continue;
-
- y = point->org_u;
-
- /* look up top zones */
- table = &blues->normal_top;
- blue_count = table->count;
- zone = table->zones;
-
- for ( ; blue_count > 0; blue_count--, zone++ )
- {
- FT_Pos delta = y - zone->org_bottom;
-
-
- if ( delta < -blues->blue_fuzz )
- break;
-
- if ( y <= zone->org_top + blues->blue_fuzz )
- if ( blues->no_overshoots || delta <= blues->blue_threshold )
- {
- point->cur_u = zone->cur_bottom;
- psh_point_set_strong( point );
- psh_point_set_fitted( point );
- }
- }
-
- /* look up bottom zones */
- table = &blues->normal_bottom;
- blue_count = table->count;
- zone = table->zones + blue_count - 1;
-
- for ( ; blue_count > 0; blue_count--, zone-- )
- {
- FT_Pos delta = zone->org_top - y;
-
-
- if ( delta < -blues->blue_fuzz )
- break;
-
- if ( y >= zone->org_bottom - blues->blue_fuzz )
- if ( blues->no_overshoots || delta < blues->blue_threshold )
- {
- point->cur_u = zone->cur_top;
- psh_point_set_strong( point );
- psh_point_set_fitted( point );
- }
- }
- }
- }
-
-
- /* interpolate strong points with the help of hinted coordinates */
- static void
- psh_glyph_interpolate_strong_points( PSH_Glyph glyph,
- FT_Int dimension )
- {
- PSH_Dimension dim = &glyph->globals->dimension[dimension];
- FT_Fixed scale = dim->scale_mult;
-
- FT_UInt count = glyph->num_points;
- PSH_Point point = glyph->points;
-
-
- for ( ; count > 0; count--, point++ )
- {
- PSH_Hint hint = point->hint;
-
-
- if ( hint )
- {
- FT_Pos delta;
-
-
- if ( psh_point_is_edge_min( point ) )
- point->cur_u = hint->cur_pos;
-
- else if ( psh_point_is_edge_max( point ) )
- point->cur_u = hint->cur_pos + hint->cur_len;
-
- else
- {
- 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 /* hint->org_len > 0 */
- point->cur_u = hint->cur_pos +
- FT_MulDiv( delta, hint->cur_len,
- hint->org_len );
- }
- psh_point_set_fitted( point );
- }
- }
- }
-
-
-#define PSH_MAX_STRONG_INTERNAL 16
-
- static void
- psh_glyph_interpolate_normal_points( PSH_Glyph glyph,
- FT_Int dimension )
- {
-
-#if 1
- /* first technique: a point is strong if it is a local extremum */
-
- PSH_Dimension dim = &glyph->globals->dimension[dimension];
- FT_Fixed scale = dim->scale_mult;
- FT_Memory memory = glyph->memory;
-
- PSH_Point* strongs = NULL;
- PSH_Point strongs_0[PSH_MAX_STRONG_INTERNAL];
- FT_UInt num_strongs = 0;
-
- PSH_Point points = glyph->points;
- PSH_Point points_end = points + glyph->num_points;
- PSH_Point point;
-
-
- /* first count the number of strong points */
- for ( point = points; point < points_end; point++ )
- {
- if ( psh_point_is_strong( point ) )
- num_strongs++;
- }
-
- if ( num_strongs == 0 ) /* nothing to do here */
- return;
-
- /* allocate an array to store a list of points, */
- /* stored in increasing org_u order */
- if ( num_strongs <= PSH_MAX_STRONG_INTERNAL )
- strongs = strongs_0;
- else
- {
- FT_Error error;
-
-
- if ( FT_NEW_ARRAY( strongs, num_strongs ) )
- return;
- }
-
- num_strongs = 0;
- for ( point = points; point < points_end; point++ )
- {
- PSH_Point* insert;
-
-
- if ( !psh_point_is_strong( point ) )
- continue;
-
- for ( insert = strongs + num_strongs; insert > strongs; insert-- )
- {
- if ( insert[-1]->org_u <= point->org_u )
- break;
-
- insert[0] = insert[-1];
- }
- insert[0] = point;
- num_strongs++;
- }
-
- /* now try to interpolate all normal points */
- for ( point = points; point < points_end; point++ )
- {
- if ( psh_point_is_strong( point ) )
- continue;
-
- /* sometimes, some local extrema are smooth points */
- if ( psh_point_is_smooth( point ) )
- {
- if ( point->dir_in == PSH_DIR_NONE ||
- point->dir_in != point->dir_out )
- continue;
-
- if ( !psh_point_is_extremum( point ) &&
- !psh_point_is_inflex( point ) )
- continue;
-
- point->flags &= ~PSH_POINT_SMOOTH;
- }
-
- /* find best enclosing point coordinates then interpolate */
- {
- PSH_Point before, after;
- FT_UInt nn;
-
-
- for ( nn = 0; nn < num_strongs; nn++ )
- if ( strongs[nn]->org_u > point->org_u )
- break;
-
- if ( nn == 0 ) /* point before the first strong point */
- {
- after = strongs[0];
-
- point->cur_u = after->cur_u +
- FT_MulFix( point->org_u - after->org_u,
- scale );
- }
- else
- {
- before = strongs[nn - 1];
-
- for ( nn = num_strongs; nn > 0; nn-- )
- if ( strongs[nn - 1]->org_u < point->org_u )
- break;
-
- if ( nn == num_strongs ) /* point is after last strong point */
- {
- before = strongs[nn - 1];
-
- point->cur_u = before->cur_u +
- FT_MulFix( point->org_u - before->org_u,
- scale );
- }
- else
- {
- FT_Pos u;
-
-
- after = strongs[nn];
-
- /* now interpolate point between before and after */
- u = point->org_u;
-
- if ( u == before->org_u )
- point->cur_u = before->cur_u;
-
- else if ( u == after->org_u )
- 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 );
- }
- }
- psh_point_set_fitted( point );
- }
- }
-
- if ( strongs != strongs_0 )
- FT_FREE( strongs );
-
-#endif /* 1 */
-
- }
-
-
- /* interpolate other points */
- static void
- psh_glyph_interpolate_other_points( PSH_Glyph glyph,
- FT_Int dimension )
- {
- PSH_Dimension dim = &glyph->globals->dimension[dimension];
- FT_Fixed scale = dim->scale_mult;
- FT_Fixed delta = dim->scale_delta;
- PSH_Contour contour = glyph->contours;
- FT_UInt num_contours = glyph->num_contours;
-
-
- for ( ; num_contours > 0; num_contours--, contour++ )
- {
- PSH_Point start = contour->start;
- PSH_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 ( psh_point_is_fitted( point ) )
- {
- if ( !first )
- first = point;
-
- fit_count++;
- }
-
- /* if there are less than 2 fitted points in the contour, we */
- /* 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 */
- /* 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 ( !psh_point_is_fitted( next ) )
- break;
-
- first = next;
- }
-
- /* find next fitted point after unfitted one */
- for (;;)
- {
- next = next->next;
- if ( psh_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
- ps_hints_apply( PS_Hints ps_hints,
- FT_Outline* outline,
- PSH_Globals globals,
- FT_Render_Mode hint_mode )
- {
- PSH_GlyphRec glyphrec;
- PSH_Glyph glyph = &glyphrec;
- FT_Error error;
-#ifdef DEBUG_HINTER
- FT_Memory memory;
-#endif
- FT_Int dimension;
-
-
- /* something to do? */
- if ( outline->n_points == 0 || outline->n_contours == 0 )
- return PSH_Err_Ok;
-
-#ifdef DEBUG_HINTER
-
- memory = globals->memory;
-
- if ( ps_debug_glyph )
- {
- psh_glyph_done( ps_debug_glyph );
- FT_FREE( ps_debug_glyph );
- }
-
- if ( FT_NEW( glyph ) )
- return error;
-
- ps_debug_glyph = glyph;
-
-#endif /* DEBUG_HINTER */
-
- error = psh_glyph_init( glyph, outline, ps_hints, globals );
- if ( error )
- goto Exit;
-
- /* try to optimize the y_scale so that the top of non-capital letters
- * is aligned on a pixel boundary whenever possible
- */
- {
- PSH_Dimension dim_x = &glyph->globals->dimension[0];
- PSH_Dimension dim_y = &glyph->globals->dimension[1];
-
- FT_Fixed x_scale = dim_x->scale_mult;
- FT_Fixed y_scale = dim_y->scale_mult;
-
- FT_Fixed old_x_scale = x_scale;
- FT_Fixed old_y_scale = y_scale;
-
- FT_Fixed scaled;
- FT_Fixed fitted;
-
- FT_Bool rescale = FALSE;
-
-
- scaled = FT_MulFix( globals->blues.normal_top.zones->org_ref, y_scale );
- fitted = FT_PIX_ROUND( scaled );
-
- if ( fitted != 0 && scaled != fitted )
- {
- rescale = TRUE;
-
- y_scale = FT_MulDiv( y_scale, fitted, scaled );
-
- if ( fitted < scaled )
- x_scale -= x_scale / 50;
-
- psh_globals_set_scale( glyph->globals, x_scale, y_scale, 0, 0 );
- }
-
- glyph->do_horz_hints = 1;
- glyph->do_vert_hints = 1;
-
- glyph->do_horz_snapping = FT_BOOL( hint_mode == FT_RENDER_MODE_MONO ||
- hint_mode == FT_RENDER_MODE_LCD );
-
- glyph->do_vert_snapping = FT_BOOL( hint_mode == FT_RENDER_MODE_MONO ||
- hint_mode == FT_RENDER_MODE_LCD_V );
-
- glyph->do_stem_adjust = FT_BOOL( hint_mode != FT_RENDER_MODE_LIGHT );
-
- for ( dimension = 0; dimension < 2; dimension++ )
- {
- /* load outline coordinates into glyph */
- psh_glyph_load_points( glyph, dimension );
-
- /* compute local extrema */
- psh_glyph_compute_extrema( glyph );
-
- /* compute aligned stem/hints positions */
- psh_hint_table_align_hints( &glyph->hint_tables[dimension],
- glyph->globals,
- dimension,
- glyph );
-
- /* find strong points, align them, then interpolate others */
- psh_glyph_find_strong_points( glyph, dimension );
- if ( dimension == 1 )
- psh_glyph_find_blue_points( &globals->blues, glyph );
- psh_glyph_interpolate_strong_points( glyph, dimension );
- psh_glyph_interpolate_normal_points( glyph, dimension );
- psh_glyph_interpolate_other_points( glyph, dimension );
-
- /* save hinted coordinates back to outline */
- psh_glyph_save_points( glyph, dimension );
-
- if ( rescale )
- psh_globals_set_scale( glyph->globals,
- old_x_scale, old_y_scale, 0, 0 );
- }
- }
-
- Exit:
-
-#ifndef DEBUG_HINTER
- psh_glyph_done( glyph );
-#endif
-
- return error;
- }
-
-
-/* END */