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-rw-r--r--src/pshinter/pshglob.c750
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diff --git a/src/pshinter/pshglob.c b/src/pshinter/pshglob.c
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--- a/src/pshinter/pshglob.c
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-/***************************************************************************/
-/* */
-/* pshglob.c */
-/* */
-/* PostScript hinter global hinting management (body). */
-/* Inspired by the new auto-hinter module. */
-/* */
-/* Copyright 2001, 2002, 2003, 2004, 2006 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_FREETYPE_H
-#include FT_INTERNAL_OBJECTS_H
-#include "pshglob.h"
-
-#ifdef DEBUG_HINTER
- PSH_Globals ps_debug_globals = 0;
-#endif
-
-
- /*************************************************************************/
- /*************************************************************************/
- /***** *****/
- /***** STANDARD WIDTHS *****/
- /***** *****/
- /*************************************************************************/
- /*************************************************************************/
-
-
- /* scale the widths/heights table */
- static void
- psh_globals_scale_widths( PSH_Globals globals,
- FT_UInt direction )
- {
- PSH_Dimension dim = &globals->dimension[direction];
- PSH_Widths stdw = &dim->stdw;
- FT_UInt count = stdw->count;
- PSH_Width width = stdw->widths;
- PSH_Width stand = width; /* standard width/height */
- FT_Fixed scale = dim->scale_mult;
-
-
- if ( count > 0 )
- {
- width->cur = FT_MulFix( width->org, scale );
- width->fit = FT_PIX_ROUND( width->cur );
-
- width++;
- count--;
-
- for ( ; count > 0; count--, width++ )
- {
- FT_Pos w, dist;
-
-
- w = FT_MulFix( width->org, scale );
- dist = w - stand->cur;
-
- if ( dist < 0 )
- dist = -dist;
-
- if ( dist < 128 )
- w = stand->cur;
-
- width->cur = w;
- width->fit = FT_PIX_ROUND( w );
- }
- }
- }
-
-
-#if 0
-
- /* org_width is is font units, result in device pixels, 26.6 format */
- FT_LOCAL_DEF( FT_Pos )
- psh_dimension_snap_width( PSH_Dimension dimension,
- FT_Int org_width )
- {
- FT_UInt n;
- FT_Pos width = FT_MulFix( org_width, dimension->scale_mult );
- FT_Pos best = 64 + 32 + 2;
- FT_Pos reference = width;
-
-
- for ( n = 0; n < dimension->stdw.count; n++ )
- {
- FT_Pos w;
- FT_Pos dist;
-
-
- w = dimension->stdw.widths[n].cur;
- dist = width - w;
- if ( dist < 0 )
- dist = -dist;
- if ( dist < best )
- {
- best = dist;
- reference = w;
- }
- }
-
- if ( width >= reference )
- {
- width -= 0x21;
- if ( width < reference )
- width = reference;
- }
- else
- {
- width += 0x21;
- if ( width > reference )
- width = reference;
- }
-
- return width;
- }
-
-#endif /* 0 */
-
-
- /*************************************************************************/
- /*************************************************************************/
- /***** *****/
- /***** BLUE ZONES *****/
- /***** *****/
- /*************************************************************************/
- /*************************************************************************/
-
- static void
- psh_blues_set_zones_0( PSH_Blues target,
- FT_Bool is_others,
- FT_UInt read_count,
- FT_Short* read,
- PSH_Blue_Table top_table,
- PSH_Blue_Table bot_table )
- {
- FT_UInt count_top = top_table->count;
- FT_UInt count_bot = bot_table->count;
- FT_Bool first = 1;
-
- FT_UNUSED( target );
-
-
- for ( ; read_count > 1; read_count -= 2 )
- {
- FT_Int reference, delta;
- FT_UInt count;
- PSH_Blue_Zone zones, zone;
- FT_Bool top;
-
-
- /* read blue zone entry, and select target top/bottom zone */
- top = 0;
- if ( first || is_others )
- {
- reference = read[1];
- delta = read[0] - reference;
-
- zones = bot_table->zones;
- count = count_bot;
- first = 0;
- }
- else
- {
- reference = read[0];
- delta = read[1] - reference;
-
- zones = top_table->zones;
- count = count_top;
- top = 1;
- }
-
- /* insert into sorted table */
- zone = zones;
- for ( ; count > 0; count--, zone++ )
- {
- if ( reference < zone->org_ref )
- break;
-
- if ( reference == zone->org_ref )
- {
- FT_Int delta0 = zone->org_delta;
-
-
- /* we have two zones on the same reference position -- */
- /* only keep the largest one */
- if ( delta < 0 )
- {
- if ( delta < delta0 )
- zone->org_delta = delta;
- }
- else
- {
- if ( delta > delta0 )
- zone->org_delta = delta;
- }
- goto Skip;
- }
- }
-
- for ( ; count > 0; count-- )
- zone[count] = zone[count-1];
-
- zone->org_ref = reference;
- zone->org_delta = delta;
-
- if ( top )
- count_top++;
- else
- count_bot++;
-
- Skip:
- read += 2;
- }
-
- top_table->count = count_top;
- bot_table->count = count_bot;
- }
-
-
- /* Re-read blue zones from the original fonts and store them into out */
- /* private structure. This function re-orders, sanitizes and */
- /* fuzz-expands the zones as well. */
- static void
- psh_blues_set_zones( PSH_Blues target,
- FT_UInt count,
- FT_Short* blues,
- FT_UInt count_others,
- FT_Short* other_blues,
- FT_Int fuzz,
- FT_Int family )
- {
- PSH_Blue_Table top_table, bot_table;
- FT_Int count_top, count_bot;
-
-
- if ( family )
- {
- top_table = &target->family_top;
- bot_table = &target->family_bottom;
- }
- else
- {
- top_table = &target->normal_top;
- bot_table = &target->normal_bottom;
- }
-
- /* read the input blue zones, and build two sorted tables */
- /* (one for the top zones, the other for the bottom zones) */
- top_table->count = 0;
- bot_table->count = 0;
-
- /* first, the blues */
- psh_blues_set_zones_0( target, 0,
- count, blues, top_table, bot_table );
- psh_blues_set_zones_0( target, 1,
- count_others, other_blues, top_table, bot_table );
-
- count_top = top_table->count;
- count_bot = bot_table->count;
-
- /* sanitize top table */
- if ( count_top > 0 )
- {
- PSH_Blue_Zone zone = top_table->zones;
-
-
- for ( count = count_top; count > 0; count--, zone++ )
- {
- FT_Int delta;
-
-
- if ( count > 1 )
- {
- delta = zone[1].org_ref - zone[0].org_ref;
- if ( zone->org_delta > delta )
- zone->org_delta = delta;
- }
-
- zone->org_bottom = zone->org_ref;
- zone->org_top = zone->org_delta + zone->org_ref;
- }
- }
-
- /* sanitize bottom table */
- if ( count_bot > 0 )
- {
- PSH_Blue_Zone zone = bot_table->zones;
-
-
- for ( count = count_bot; count > 0; count--, zone++ )
- {
- FT_Int delta;
-
-
- if ( count > 1 )
- {
- delta = zone[0].org_ref - zone[1].org_ref;
- if ( zone->org_delta < delta )
- zone->org_delta = delta;
- }
-
- zone->org_top = zone->org_ref;
- zone->org_bottom = zone->org_delta + zone->org_ref;
- }
- }
-
- /* expand top and bottom tables with blue fuzz */
- {
- FT_Int dim, top, bot, delta;
- PSH_Blue_Zone zone;
-
-
- zone = top_table->zones;
- count = count_top;
-
- for ( dim = 1; dim >= 0; dim-- )
- {
- if ( count > 0 )
- {
- /* expand the bottom of the lowest zone normally */
- zone->org_bottom -= fuzz;
-
- /* expand the top and bottom of intermediate zones; */
- /* checking that the interval is smaller than the fuzz */
- top = zone->org_top;
-
- for ( count--; count > 0; count-- )
- {
- bot = zone[1].org_bottom;
- delta = bot - top;
-
- if ( delta < 2 * fuzz )
- zone[0].org_top = zone[1].org_bottom = top + delta / 2;
- else
- {
- zone[0].org_top = top + fuzz;
- zone[1].org_bottom = bot - fuzz;
- }
-
- zone++;
- top = zone->org_top;
- }
-
- /* expand the top of the highest zone normally */
- zone->org_top = top + fuzz;
- }
- zone = bot_table->zones;
- count = count_bot;
- }
- }
- }
-
-
- /* reset the blues table when the device transform changes */
- static void
- psh_blues_scale_zones( PSH_Blues blues,
- FT_Fixed scale,
- FT_Pos delta )
- {
- FT_UInt count;
- FT_UInt num;
- PSH_Blue_Table table = 0;
-
- /* */
- /* Determine whether we need to suppress overshoots or */
- /* not. We simply need to compare the vertical scale */
- /* parameter to the raw bluescale value. Here is why: */
- /* */
- /* We need to suppress overshoots for all pointsizes. */
- /* At 300dpi that satisfies: */
- /* */
- /* pointsize < 240*bluescale + 0.49 */
- /* */
- /* This corresponds to: */
- /* */
- /* pixelsize < 1000*bluescale + 49/24 */
- /* */
- /* scale*EM_Size < 1000*bluescale + 49/24 */
- /* */
- /* However, for normal Type 1 fonts, EM_Size is 1000! */
- /* We thus only check: */
- /* */
- /* scale < bluescale + 49/24000 */
- /* */
- /* which we shorten to */
- /* */
- /* "scale < bluescale" */
- /* */
- /* Note that `blue_scale' is stored 1000 times its real */
- /* value, and that `scale' converts from font units to */
- /* fractional pixels. */
- /* */
-
- /* 1000 / 64 = 125 / 8 */
- if ( scale >= 0x20C49BAL )
- blues->no_overshoots = FT_BOOL( scale < blues->blue_scale * 8 / 125 );
- else
- blues->no_overshoots = FT_BOOL( scale * 125 < blues->blue_scale * 8 );
-
- /* */
- /* The blue threshold is the font units distance under */
- /* which overshoots are suppressed due to the BlueShift */
- /* even if the scale is greater than BlueScale. */
- /* */
- /* It is the smallest distance such that */
- /* */
- /* dist <= BlueShift && dist*scale <= 0.5 pixels */
- /* */
- {
- FT_Int threshold = blues->blue_shift;
-
-
- while ( threshold > 0 && FT_MulFix( threshold, scale ) > 32 )
- threshold--;
-
- blues->blue_threshold = threshold;
- }
-
- for ( num = 0; num < 4; num++ )
- {
- PSH_Blue_Zone zone;
-
-
- switch ( num )
- {
- case 0:
- table = &blues->normal_top;
- break;
- case 1:
- table = &blues->normal_bottom;
- break;
- case 2:
- table = &blues->family_top;
- break;
- default:
- table = &blues->family_bottom;
- break;
- }
-
- zone = table->zones;
- count = table->count;
- for ( ; count > 0; count--, zone++ )
- {
- zone->cur_top = FT_MulFix( zone->org_top, scale ) + delta;
- zone->cur_bottom = FT_MulFix( zone->org_bottom, scale ) + delta;
- zone->cur_ref = FT_MulFix( zone->org_ref, scale ) + delta;
- zone->cur_delta = FT_MulFix( zone->org_delta, scale );
-
- /* round scaled reference position */
- zone->cur_ref = FT_PIX_ROUND( zone->cur_ref );
-
-#if 0
- if ( zone->cur_ref > zone->cur_top )
- zone->cur_ref -= 64;
- else if ( zone->cur_ref < zone->cur_bottom )
- zone->cur_ref += 64;
-#endif
- }
- }
-
- /* process the families now */
-
- for ( num = 0; num < 2; num++ )
- {
- PSH_Blue_Zone zone1, zone2;
- FT_UInt count1, count2;
- PSH_Blue_Table normal, family;
-
-
- switch ( num )
- {
- case 0:
- normal = &blues->normal_top;
- family = &blues->family_top;
- break;
-
- default:
- normal = &blues->normal_bottom;
- family = &blues->family_bottom;
- }
-
- zone1 = normal->zones;
- count1 = normal->count;
-
- for ( ; count1 > 0; count1--, zone1++ )
- {
- /* try to find a family zone whose reference position is less */
- /* than 1 pixel far from the current zone */
- zone2 = family->zones;
- count2 = family->count;
-
- for ( ; count2 > 0; count2--, zone2++ )
- {
- FT_Pos Delta;
-
-
- Delta = zone1->org_ref - zone2->org_ref;
- if ( Delta < 0 )
- Delta = -Delta;
-
- if ( FT_MulFix( Delta, scale ) < 64 )
- {
- zone1->cur_top = zone2->cur_top;
- zone1->cur_bottom = zone2->cur_bottom;
- zone1->cur_ref = zone2->cur_ref;
- zone1->cur_delta = zone2->cur_delta;
- break;
- }
- }
- }
- }
- }
-
-
- FT_LOCAL_DEF( void )
- psh_blues_snap_stem( PSH_Blues blues,
- FT_Int stem_top,
- FT_Int stem_bot,
- PSH_Alignment alignment )
- {
- PSH_Blue_Table table;
- FT_UInt count;
- FT_Pos delta;
- PSH_Blue_Zone zone;
- FT_Int no_shoots;
-
-
- alignment->align = PSH_BLUE_ALIGN_NONE;
-
- no_shoots = blues->no_overshoots;
-
- /* look up stem top in top zones table */
- table = &blues->normal_top;
- count = table->count;
- zone = table->zones;
-
- for ( ; count > 0; count--, zone++ )
- {
- delta = stem_top - zone->org_bottom;
- if ( delta < -blues->blue_fuzz )
- break;
-
- if ( stem_top <= zone->org_top + blues->blue_fuzz )
- {
- if ( no_shoots || delta <= blues->blue_threshold )
- {
- alignment->align |= PSH_BLUE_ALIGN_TOP;
- alignment->align_top = zone->cur_ref;
- }
- break;
- }
- }
-
- /* look up stem bottom in bottom zones table */
- table = &blues->normal_bottom;
- count = table->count;
- zone = table->zones + count-1;
-
- for ( ; count > 0; count--, zone-- )
- {
- delta = zone->org_top - stem_bot;
- if ( delta < -blues->blue_fuzz )
- break;
-
- if ( stem_bot >= zone->org_bottom - blues->blue_fuzz )
- {
- if ( no_shoots || delta < blues->blue_threshold )
- {
- alignment->align |= PSH_BLUE_ALIGN_BOT;
- alignment->align_bot = zone->cur_ref;
- }
- break;
- }
- }
- }
-
-
- /*************************************************************************/
- /*************************************************************************/
- /***** *****/
- /***** GLOBAL HINTS *****/
- /***** *****/
- /*************************************************************************/
- /*************************************************************************/
-
- static void
- psh_globals_destroy( PSH_Globals globals )
- {
- if ( globals )
- {
- FT_Memory memory;
-
-
- memory = globals->memory;
- globals->dimension[0].stdw.count = 0;
- globals->dimension[1].stdw.count = 0;
-
- globals->blues.normal_top.count = 0;
- globals->blues.normal_bottom.count = 0;
- globals->blues.family_top.count = 0;
- globals->blues.family_bottom.count = 0;
-
- FT_FREE( globals );
-
-#ifdef DEBUG_HINTER
- ps_debug_globals = 0;
-#endif
- }
- }
-
-
- static FT_Error
- psh_globals_new( FT_Memory memory,
- T1_Private* priv,
- PSH_Globals *aglobals )
- {
- PSH_Globals globals;
- FT_Error error;
-
-
- if ( !FT_NEW( globals ) )
- {
- FT_UInt count;
- FT_Short* read;
-
-
- globals->memory = memory;
-
- /* copy standard widths */
- {
- PSH_Dimension dim = &globals->dimension[1];
- PSH_Width write = dim->stdw.widths;
-
-
- write->org = priv->standard_width[0];
- write++;
-
- read = priv->snap_widths;
- for ( count = priv->num_snap_widths; count > 0; count-- )
- {
- write->org = *read;
- write++;
- read++;
- }
-
- dim->stdw.count = priv->num_snap_widths + 1;
- }
-
- /* copy standard heights */
- {
- PSH_Dimension dim = &globals->dimension[0];
- PSH_Width write = dim->stdw.widths;
-
-
- write->org = priv->standard_height[0];
- write++;
- read = priv->snap_heights;
- for ( count = priv->num_snap_heights; count > 0; count-- )
- {
- write->org = *read;
- write++;
- read++;
- }
-
- dim->stdw.count = priv->num_snap_heights + 1;
- }
-
- /* copy blue zones */
- psh_blues_set_zones( &globals->blues, priv->num_blue_values,
- priv->blue_values, priv->num_other_blues,
- priv->other_blues, priv->blue_fuzz, 0 );
-
- psh_blues_set_zones( &globals->blues, priv->num_family_blues,
- priv->family_blues, priv->num_family_other_blues,
- priv->family_other_blues, priv->blue_fuzz, 1 );
-
- globals->blues.blue_scale = priv->blue_scale;
- globals->blues.blue_shift = priv->blue_shift;
- globals->blues.blue_fuzz = priv->blue_fuzz;
-
- globals->dimension[0].scale_mult = 0;
- globals->dimension[0].scale_delta = 0;
- globals->dimension[1].scale_mult = 0;
- globals->dimension[1].scale_delta = 0;
-
-#ifdef DEBUG_HINTER
- ps_debug_globals = globals;
-#endif
- }
-
- *aglobals = globals;
- return error;
- }
-
-
- FT_LOCAL_DEF( FT_Error )
- psh_globals_set_scale( PSH_Globals globals,
- FT_Fixed x_scale,
- FT_Fixed y_scale,
- FT_Fixed x_delta,
- FT_Fixed y_delta )
- {
- PSH_Dimension dim = &globals->dimension[0];
-
-
- dim = &globals->dimension[0];
- if ( x_scale != dim->scale_mult ||
- x_delta != dim->scale_delta )
- {
- dim->scale_mult = x_scale;
- dim->scale_delta = x_delta;
-
- psh_globals_scale_widths( globals, 0 );
- }
-
- dim = &globals->dimension[1];
- if ( y_scale != dim->scale_mult ||
- y_delta != dim->scale_delta )
- {
- dim->scale_mult = y_scale;
- dim->scale_delta = y_delta;
-
- psh_globals_scale_widths( globals, 1 );
- psh_blues_scale_zones( &globals->blues, y_scale, y_delta );
- }
-
- return 0;
- }
-
-
- FT_LOCAL_DEF( void )
- psh_globals_funcs_init( PSH_Globals_FuncsRec* funcs )
- {
- funcs->create = psh_globals_new;
- funcs->set_scale = psh_globals_set_scale;
- funcs->destroy = psh_globals_destroy;
- }
-
-
-/* END */
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