--- /dev/null
+/***************************************************************************/
+/* */
+/* ahhint.c */
+/* */
+/* Glyph hinter (body). */
+/* */
+/* Copyright 2000 Catharon Productions Inc. */
+/* Author: David Turner */
+/* */
+/* This file is part of the Catharon Typography Project and shall only */
+/* be used, modified, and distributed under the terms of the Catharon */
+/* Open Source License that should come with this file under the name */
+/* `CatharonLicense.txt'. By continuing to use, modify, or distribute */
+/* this file you indicate that you have read the license and */
+/* understand and accept it fully. */
+/* */
+/* Note that this license is compatible with the FreeType license. */
+/* */
+/***************************************************************************/
+
+
+#ifdef FT_FLAT_COMPILE
+
+#include "ahhint.h"
+#include "ahglyph.h"
+#include "ahangles.h"
+
+#else
+
+#include <autohint/ahhint.h>
+#include <autohint/ahglyph.h>
+#include <autohint/ahangles.h>
+
+#endif
+
+#include <freetype/ftoutln.h>
+
+
+#define FACE_GLOBALS( face ) ((AH_Face_Globals*)(face)->autohint.data)
+
+#define AH_USE_IUP
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /**** ****/
+ /**** Hinting routines ****/
+ /**** ****/
+ /*************************************************************************/
+ /*************************************************************************/
+
+
+ static int disable_horz_edges = 0;
+ static int disable_vert_edges = 0;
+
+
+ /* snap a given width in scaled coordinates to one of the */
+ /* current standard widths */
+ static
+ FT_Pos ah_snap_width( FT_Pos* widths,
+ FT_Int count,
+ FT_Pos width )
+ {
+ int n;
+ FT_Pos best = 64 + 32 + 2;
+ FT_Pos reference = width;
+
+
+ for ( n = 0; n < count; n++ )
+ {
+ FT_Pos w;
+ FT_Pos dist;
+
+
+ w = widths[n];
+ 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;
+ }
+
+
+ /* align one stem edge relative to the previous stem edge */
+ static
+ void ah_align_linked_edge( AH_Hinter* hinter,
+ AH_Edge* base_edge,
+ AH_Edge* stem_edge,
+ int vertical )
+ {
+ FT_Pos dist = stem_edge->opos - base_edge->opos;
+ AH_Globals* globals = &hinter->globals->scaled;
+ FT_Pos sign = 1;
+
+
+ if ( dist < 0 )
+ {
+ dist = -dist;
+ sign = -1;
+ }
+
+ if ( vertical )
+ {
+ dist = ah_snap_width( globals->heights, globals->num_heights, dist );
+
+ /* in the case of vertical hinting, always round */
+ /* the stem heights to integer pixels */
+ if ( dist >= 64 )
+ dist = ( dist + 16 ) & -64;
+ else
+ dist = 64;
+ }
+ else
+ {
+ dist = ah_snap_width( globals->widths, globals->num_widths, dist );
+
+ if ( hinter->flags & ah_hinter_monochrome )
+ {
+ /* monochrome horizontal hinting: snap widths to integer pixels */
+ /* with a different threshold */
+ if ( dist < 64 )
+ dist = 64;
+ else
+ dist = ( dist + 32 ) & -64;
+ }
+ else
+ {
+ /* for horizontal anti-aliased hinting, we adopt a more subtle */
+ /* approach: we strengthen small stems, round stems whose size */
+ /* is between 1 and 2 pixels to an integer, otherwise nothing */
+ if ( dist < 48 )
+ dist = ( dist + 64 ) >> 1;
+
+ else if ( dist < 128 )
+ dist = ( dist + 42 ) & -64;
+ }
+ }
+
+ stem_edge->pos = base_edge->pos + sign * dist;
+ }
+
+
+ static
+ void ah_align_serif_edge( AH_Hinter* hinter,
+ AH_Edge* base,
+ AH_Edge* serif )
+ {
+ FT_Pos dist;
+ FT_Pos sign = 1;
+
+ UNUSED( hinter );
+
+
+ dist = serif->opos - base->opos;
+ if ( dist < 0 )
+ {
+ dist = -dist;
+ sign = -1;
+ }
+
+ /* do not strengthen serifs */
+ if ( base->flags & ah_edge_done )
+ {
+ if ( dist > 64 )
+ dist = ( dist + 16 ) & -64;
+
+ else if ( dist <= 32 )
+ dist = ( dist + 33 ) >> 1;
+ }
+
+ serif->pos = base->pos + sign * dist;
+ }
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /*************************************************************************/
+ /**** ****/
+ /**** E D G E H I N T I N G ****/
+ /**** ****/
+ /*************************************************************************/
+ /*************************************************************************/
+ /*************************************************************************/
+
+
+ /* Another alternative edge hinting algorithm */
+ static
+ void ah_hint_edges_3( AH_Hinter* hinter )
+ {
+ AH_Edge* edges;
+ AH_Edge* edge_limit;
+ AH_Outline* outline = hinter->glyph;
+ FT_Int dimension;
+
+
+ edges = outline->horz_edges;
+ edge_limit = edges + outline->num_hedges;
+
+ for ( dimension = 1; dimension >= 0; dimension-- )
+ {
+ AH_Edge* edge;
+ AH_Edge* before = 0;
+ AH_Edge* after = 0;
+ AH_Edge* anchor = 0;
+ int has_serifs = 0;
+
+
+ if ( disable_vert_edges && !dimension )
+ goto Next_Dimension;
+
+ if ( disable_horz_edges && dimension )
+ goto Next_Dimension;
+
+ /* we begin by aligning all stems relative to the blue zone */
+ /* if needed -- that's only for horizontal edges */
+ if ( dimension )
+ {
+ for ( edge = edges; edge < edge_limit; edge++ )
+ {
+ FT_Pos* blue;
+ AH_Edge *edge1, *edge2;
+
+
+ if ( edge->flags & ah_edge_done )
+ continue;
+
+ blue = edge->blue_edge;
+ edge1 = 0;
+ edge2 = edge->link;
+
+ if ( blue )
+ {
+ edge1 = edge;
+ }
+ else if (edge2 && edge2->blue_edge)
+ {
+ blue = edge2->blue_edge;
+ edge1 = edge2;
+ edge2 = edge;
+ }
+
+ if ( !edge1 )
+ continue;
+
+ edge1->pos = blue[0];
+ edge1->flags |= ah_edge_done;
+
+ if ( edge2 && !edge2->blue_edge )
+ {
+ ah_align_linked_edge( hinter, edge1, edge2, dimension );
+ edge2->flags |= ah_edge_done;
+ }
+
+ if ( !anchor )
+ anchor = edge;
+ }
+ }
+
+ /* now, we will align all stem edges, trying to maintain the */
+ /* relative order of stems in the glyph.. */
+ before = 0;
+ after = 0;
+ for ( edge = edges; edge < edge_limit; edge++ )
+ {
+ AH_Edge *edge2;
+
+
+ if ( edge->flags & ah_edge_done )
+ continue;
+
+ /* skip all non-stem edges */
+ edge2 = edge->link;
+ if ( !edge2 )
+ {
+ has_serifs++;
+ continue;
+ }
+
+ /* now, align the stem */
+
+ /* this should not happen, but it's better to be safe.. */
+ if ( edge2->blue_edge || edge2 < edge )
+ {
+
+#if 0
+ printf( "strange blue alignement, edge %d to %d\n",
+ edge - edges, edge2 - edges );
+#endif
+
+ ah_align_linked_edge( hinter, edge2, edge, dimension );
+ edge->flags |= ah_edge_done;
+ continue;
+ }
+
+ {
+ FT_Bool min = 0;
+ FT_Pos delta;
+
+ if ( !anchor )
+ {
+ edge->pos = ( edge->opos + 32 ) & -64;
+ anchor = edge;
+ }
+ else
+ edge->pos = anchor->pos +
+ ( ( edge->opos - anchor->opos + 32 ) & -64 );
+
+ edge->flags |= ah_edge_done;
+
+ if ( edge > edges && edge->pos < edge[-1].pos )
+ {
+ edge->pos = edge[-1].pos;
+ min = 1;
+ }
+
+ ah_align_linked_edge( hinter, edge, edge2, dimension );
+ delta = 0;
+ if ( edge2 + 1 < edge_limit &&
+ edge2[1].flags & ah_edge_done )
+ delta = edge2[1].pos - edge2->pos;
+
+ if ( delta < 0 )
+ {
+ edge2->pos += delta;
+ if ( !min )
+ edge->pos += delta;
+ }
+ edge2->flags |= ah_edge_done;
+ }
+ }
+
+ if ( !has_serifs )
+ goto Next_Dimension;
+
+ /* now, hint the remaining edges (serifs and single) in order */
+ /* to complete our processing */
+ for ( edge = edges; edge < edge_limit; edge++ )
+ {
+ if ( edge->flags & ah_edge_done )
+ continue;
+
+ if ( edge->serif )
+ {
+ ah_align_serif_edge( hinter, edge->serif, edge );
+ }
+ else if ( !anchor )
+ {
+ edge->pos = ( edge->opos + 32 ) & -64;
+ anchor = edge;
+ }
+ else
+ edge->pos = anchor->pos +
+ ( ( edge->opos-anchor->opos + 32 ) & -64 );
+
+ edge->flags |= ah_edge_done;
+
+ if ( edge > edges && edge->pos < edge[-1].pos )
+ edge->pos = edge[-1].pos;
+
+ if ( edge + 1 < edge_limit &&
+ edge[1].flags & ah_edge_done &&
+ edge->pos > edge[1].pos )
+ edge->pos = edge[1].pos;
+ }
+
+ Next_Dimension:
+ edges = outline->vert_edges;
+ edge_limit = edges + outline->num_vedges;
+ }
+ }
+
+
+ LOCAL_FUNC
+ void ah_hinter_hint_edges( AH_Hinter* hinter,
+ int no_horz_edges,
+ int no_vert_edges )
+ {
+ disable_horz_edges = no_horz_edges;
+ disable_vert_edges = no_vert_edges;
+
+ /* AH_Interpolate_Blue_Edges( hinter ); -- doesn't seem to help */
+ /* reduce the problem of the disappearing eye in the `e' of Times... */
+ /* also, creates some artifacts near the blue zones? */
+ {
+ ah_hint_edges_3( hinter );
+
+#if 0
+ /* outline optimizer removed temporarily */
+ if ( hinter->flags & ah_hinter_optimize )
+ {
+ AH_Optimizer opt;
+
+
+ if ( !AH_Optimizer_Init( &opt, hinter->glyph, hinter->memory ) )
+ {
+ AH_Optimizer_Compute( &opt );
+ AH_Optimizer_Done( &opt );
+ }
+ }
+#endif
+
+ }
+ }
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /*************************************************************************/
+ /**** ****/
+ /**** P O I N T H I N T I N G ****/
+ /**** ****/
+ /*************************************************************************/
+ /*************************************************************************/
+ /*************************************************************************/
+
+ static
+ void ah_hinter_align_edge_points( AH_Hinter* hinter )
+ {
+ AH_Outline* outline = hinter->glyph;
+ AH_Edge* edges;
+ AH_Edge* edge_limit;
+ FT_Int dimension;
+
+
+ edges = outline->horz_edges;
+ edge_limit = edges + outline->num_hedges;
+
+ for ( dimension = 1; dimension >= 0; dimension-- )
+ {
+ AH_Edge* edge;
+ AH_Edge* before;
+ AH_Edge* after;
+
+
+ before = 0;
+ after = 0;
+
+ edge = edges;
+ for ( ; edge < edge_limit; edge++ )
+ {
+ /* move the points of each segment */
+ /* in each edge to the edge's position */
+ AH_Segment* seg = edge->first;
+
+
+ do
+ {
+ AH_Point* point = seg->first;
+
+
+ for (;;)
+ {
+ if ( dimension )
+ {
+ point->y = edge->pos;
+ point->flags |= ah_flah_touch_y;
+ }
+ else
+ {
+ point->x = edge->pos;
+ point->flags |= ah_flah_touch_x;
+ }
+
+ if ( point == seg->last )
+ break;
+
+ point = point->next;
+ }
+
+ seg = seg->edge_next;
+
+ } while ( seg != edge->first );
+ }
+
+ edges = outline->vert_edges;
+ edge_limit = edges + outline->num_vedges;
+ }
+ }
+
+
+ /* hint the strong points -- this is equivalent to the TrueType `IP' */
+ static
+ void ah_hinter_align_strong_points( AH_Hinter* hinter )
+ {
+ AH_Outline* outline = hinter->glyph;
+ FT_Int dimension;
+ AH_Edge* edges;
+ AH_Edge* edge_limit;
+ AH_Point* points;
+ AH_Point* point_limit;
+ AH_Flags touch_flag;
+
+
+ points = outline->points;
+ point_limit = points + outline->num_points;
+
+ edges = outline->horz_edges;
+ edge_limit = edges + outline->num_hedges;
+ touch_flag = ah_flah_touch_y;
+
+ for ( dimension = 1; dimension >= 0; dimension-- )
+ {
+ AH_Point* point;
+ AH_Edge* edge;
+ AH_Edge* before;
+ AH_Edge* after;
+
+
+ before = 0;
+ after = 0;
+
+ if ( edges < edge_limit )
+ for ( point = points; point < point_limit; point++ )
+ {
+ FT_Pos u, ou, fu; /* point position */
+ FT_Pos delta;
+
+
+ if ( point->flags & touch_flag )
+ continue;
+
+#ifndef AH_OPTION_NO_WEAK_INTERPOLATION
+ /* if this point is candidate to weak interpolation, we will */
+ /* interpolate it after all strong points have been processed */
+ if ( point->flags & ah_flah_weak_interpolation )
+ continue;
+#endif
+
+ if ( dimension )
+ {
+ u = point->fy;
+ ou = point->oy;
+ }
+ else
+ {
+ u = point->fx;
+ ou = point->ox;
+ }
+
+ fu = u;
+
+ /* is the point before the first edge? */
+ edge = edges;
+ delta = edge->fpos - u;
+ if ( delta >= 0 )
+ {
+ u = edge->pos - ( edge->opos - ou );
+ goto Store_Point;
+ }
+
+ /* is the point after the last edge ? */
+ edge = edge_limit - 1;
+ delta = u - edge->fpos;
+ if ( delta >= 0 )
+ {
+ u = edge->pos + ( ou - edge->opos );
+ goto Store_Point;
+ }
+
+ /* otherwise, interpolate the point in between */
+ {
+ AH_Edge* before = 0;
+ AH_Edge* after = 0;
+
+
+ for ( edge = edges; edge < edge_limit; edge++ )
+ {
+ if ( u == edge->fpos )
+ {
+ u = edge->pos;
+ goto Store_Point;
+ }
+ if ( u < edge->fpos )
+ break;
+ before = edge;
+ }
+
+ for ( edge = edge_limit - 1; edge >= edges; edge-- )
+ {
+ if ( u == edge->fpos )
+ {
+ u = edge->pos;
+ goto Store_Point;
+ }
+ if ( u > edge->fpos )
+ break;
+ after = edge;
+ }
+
+ /* assert( before && after && before != after ) */
+ u = before->pos + FT_MulDiv( fu - before->fpos,
+ after->pos - before->pos,
+ after->fpos - before->fpos );
+ }
+
+ Store_Point:
+
+ /* save the point position */
+ if ( dimension )
+ point->y = u;
+ else
+ point->x = u;
+
+ point->flags |= touch_flag;
+ }
+
+ edges = outline->vert_edges;
+ edge_limit = edges + outline->num_vedges;
+ touch_flag = ah_flah_touch_x;
+ }
+ }
+
+
+#ifndef AH_OPTION_NO_WEAK_INTERPOLATION
+
+ static
+ void ah_iup_shift( AH_Point* p1,
+ AH_Point* p2,
+ AH_Point* ref )
+ {
+ AH_Point* p;
+ FT_Pos delta = ref->u - ref->v;
+
+
+ for ( p = p1; p < ref; p++ )
+ p->u = p->v + delta;
+
+ for ( p = ref + 1; p <= p2; p++ )
+ p->u = p->v + delta;
+ }
+
+
+ static
+ void ah_iup_interp( AH_Point* p1,
+ AH_Point* p2,
+ AH_Point* ref1,
+ AH_Point* ref2 )
+ {
+ AH_Point* p;
+ FT_Pos u;
+ FT_Pos v1 = ref1->v;
+ FT_Pos v2 = ref2->v;
+ FT_Pos d1 = ref1->u - v1;
+ FT_Pos d2 = ref2->u - v2;
+
+
+ if ( p1 > p2 )
+ return;
+
+ if ( v1 == v2 )
+ {
+ for ( p = p1; p <= p2; p++ )
+ {
+ FT_Pos u = p->v;
+
+
+ if ( u <= v1 )
+ u += d1;
+ else
+ u += d2;
+
+ p->u = u;
+ }
+ return;
+ }
+
+ if ( v1 < v2 )
+ {
+ for ( p = p1; p <= p2; p++ )
+ {
+ u = p->v;
+
+ if ( u <= v1 )
+ u += d1;
+ else if ( u >= v2 )
+ u += d2;
+ else
+ u = ref1->u + FT_MulDiv( u - v1, ref2->u - ref1->u, v2 - v1 );
+
+ p->u = u;
+ }
+ }
+ else
+ {
+ for ( p = p1; p <= p2; p++ )
+ {
+ u = p->v;
+
+ if ( u <= v2 )
+ u += d2;
+ else if ( u >= v1 )
+ u += d1;
+ else
+ u = ref1->u + FT_MulDiv( u - v1, ref2->u - ref1->u, v2 - v1 );
+
+ p->u = u;
+ }
+ }
+ }
+
+
+ /* interpolate weak points -- this is equivalent to the TrueType `IUP' */
+ static
+ void ah_hinter_align_weak_points( AH_Hinter* hinter )
+ {
+ AH_Outline* outline = hinter->glyph;
+ FT_Int dimension;
+ AH_Edge* edges;
+ AH_Edge* edge_limit;
+ AH_Point* points;
+ AH_Point* point_limit;
+ AH_Point** contour_limit;
+ AH_Flags touch_flag;
+
+
+ points = outline->points;
+ point_limit = points + outline->num_points;
+
+ /* PASS 1: Move segment points to edge positions */
+
+ edges = outline->horz_edges;
+ edge_limit = edges + outline->num_hedges;
+ touch_flag = ah_flah_touch_y;
+
+ contour_limit = outline->contours + outline->num_contours;
+
+ ah_setup_uv( outline, ah_uv_oy );
+
+ for ( dimension = 1; dimension >= 0; dimension-- )
+ {
+ AH_Point* point;
+ AH_Point* end_point;
+ AH_Point* first_point;
+ AH_Point** contour;
+
+
+ point = points;
+ contour = outline->contours;
+
+ for ( ; contour < contour_limit; contour++ )
+ {
+ point = *contour;
+ end_point = point->prev;
+ first_point = point;
+
+ while ( point <= end_point && !( point->flags & touch_flag ) )
+ point++;
+
+ if ( point <= end_point )
+ {
+ AH_Point* first_touched = point;
+ AH_Point* cur_touched = point;
+
+
+ point++;
+ while ( point <= end_point )
+ {
+ if ( point->flags & touch_flag )
+ {
+ /* we found two successive touched points; we interpolate */
+ /* all contour points between them */
+ ah_iup_interp( cur_touched + 1, point - 1,
+ cur_touched, point );
+ cur_touched = point;
+ }
+ point++;
+ }
+
+ if ( cur_touched == first_touched )
+ {
+ /* this is a special case: only one point was touched in the */
+ /* contour; we thus simply shift the whole contour */
+ ah_iup_shift( first_point, end_point, cur_touched );
+ }
+ else
+ {
+ /* now interpolate after the last touched point to the end */
+ /* of the contour */
+ ah_iup_interp( cur_touched + 1, end_point,
+ cur_touched, first_touched );
+
+ /* if the first contour point isn't touched, interpolate */
+ /* from the contour start to the first touched point */
+ if ( first_touched > points )
+ ah_iup_interp( first_point, first_touched - 1,
+ cur_touched, first_touched );
+ }
+ }
+ }
+
+ /* now save the interpolated values back to x/y */
+ if ( dimension )
+ {
+ for ( point = points; point < point_limit; point++ )
+ point->y = point->u;
+
+ touch_flag = ah_flah_touch_x;
+ ah_setup_uv( outline, ah_uv_ox );
+ }
+ else
+ {
+ for ( point = points; point < point_limit; point++ )
+ point->x = point->u;
+
+ break; /* exit loop */
+ }
+ }
+ }
+
+#endif /* !AH_OPTION_NO_WEAK_INTERPOLATION */
+
+
+ LOCAL_FUNC
+ void ah_hinter_align_points( AH_Hinter* hinter )
+ {
+ ah_hinter_align_edge_points( hinter );
+
+#ifndef AH_OPTION_NO_STRONG_INTERPOLATION
+ ah_hinter_align_strong_points( hinter );
+#endif
+
+#ifndef AH_OPTION_NO_WEAK_INTERPOLATION
+ ah_hinter_align_weak_points( hinter );
+#endif
+ }
+
+
+ /*************************************************************************/
+ /*************************************************************************/
+ /*************************************************************************/
+ /**** ****/
+ /**** H I N T E R O B J E C T M E T H O D S ****/
+ /**** ****/
+ /*************************************************************************/
+ /*************************************************************************/
+ /*************************************************************************/
+
+
+ /* scale and fit the global metrics */
+ static
+ void ah_hinter_scale_globals( AH_Hinter* hinter,
+ FT_Fixed x_scale,
+ FT_Fixed y_scale )
+ {
+ FT_Int n;
+ AH_Face_Globals* globals = hinter->globals;
+ AH_Globals* design = &globals->design;
+ AH_Globals* scaled = &globals->scaled;
+
+
+ /* copy content */
+ *scaled = *design;
+
+ /* scale the standard widths & heights */
+ for ( n = 0; n < design->num_widths; n++ )
+ scaled->widths[n] = FT_MulFix( design->widths[n], x_scale );
+
+ for ( n = 0; n < design->num_heights; n++ )
+ scaled->heights[n] = FT_MulFix( design->heights[n], y_scale );
+
+ /* scale the blue zones */
+ for ( n = 0; n < ah_blue_max; n++ )
+ {
+ FT_Pos delta, delta2;
+
+
+ delta = design->blue_shoots[n] - design->blue_refs[n];
+ delta2 = delta;
+ if ( delta < 0 )
+ delta2 = -delta2;
+ delta2 = FT_MulFix( delta2, y_scale );
+
+ if ( delta2 < 32 )
+ delta2 = 0;
+ else if ( delta2 < 64 )
+ delta2 = 32 + ( ( ( delta2 - 32 ) + 16 ) & -32 );
+ else
+ delta2 = ( delta2 + 32 ) & -64;
+
+ if ( delta < 0 )
+ delta2 = -delta2;
+
+ scaled->blue_refs[n] =
+ ( FT_MulFix( design->blue_refs[n], y_scale ) + 32 ) & -64;
+ scaled->blue_shoots[n] = scaled->blue_refs[n] + delta2;
+ }
+
+ globals->x_scale = x_scale;
+ globals->y_scale = y_scale;
+ }
+
+
+ static
+ void ah_hinter_align( AH_Hinter* hinter )
+ {
+ ah_hinter_align_edge_points( hinter );
+ ah_hinter_align_points( hinter );
+ }
+
+
+ /* finalize a hinter object */
+ void ah_hinter_done( AH_Hinter* hinter )
+ {
+ if ( hinter )
+ {
+ FT_Memory memory = hinter->memory;
+
+
+ ah_loader_done( hinter->loader );
+ ah_outline_done( hinter->glyph );
+
+ /* note: the `globals' pointer is _not_ owned by the hinter */
+ /* but by the current face object, we don't need to */
+ /* release it */
+ hinter->globals = 0;
+ hinter->face = 0;
+
+ FREE( hinter );
+ }
+ }
+
+
+ /* create a new empty hinter object */
+ FT_Error ah_hinter_new( FT_Library library,
+ AH_Hinter** ahinter )
+ {
+ AH_Hinter* hinter = 0;
+ FT_Memory memory = library->memory;
+ FT_Error error;
+
+
+ *ahinter = 0;
+
+ /* allocate object */
+ if ( ALLOC( hinter, sizeof ( *hinter ) ) )
+ goto Exit;
+
+ hinter->memory = memory;
+ hinter->flags = 0;
+
+ /* allocate outline and loader */
+ error = ah_outline_new( memory, &hinter->glyph ) ||
+ ah_loader_new ( memory, &hinter->loader ) ||
+ ah_loader_create_extra( hinter->loader );
+ if ( error )
+ goto Exit;
+
+ *ahinter = hinter;
+
+ Exit:
+ if ( error )
+ ah_hinter_done( hinter );
+
+ return error;
+ }
+
+
+ /* create a face's autohint globals */
+ FT_Error ah_hinter_new_face_globals( AH_Hinter* hinter,
+ FT_Face face,
+ AH_Globals* globals )
+ {
+ FT_Error error;
+ FT_Memory memory = hinter->memory;
+ AH_Face_Globals* face_globals;
+
+
+ if ( ALLOC( face_globals, sizeof ( *face_globals ) ) )
+ goto Exit;
+
+ hinter->face = face;
+ hinter->globals = face_globals;
+
+ if ( globals )
+ face_globals->design = *globals;
+ else
+ ah_hinter_compute_globals( hinter );
+
+ face->autohint.data = face_globals;
+ face->autohint.finalizer = (FT_Generic_Finalizer)
+ ah_hinter_done_face_globals;
+ face_globals->face = face;
+
+ Exit:
+ return error;
+ }
+
+
+ /* discard a face's autohint globals */
+ void ah_hinter_done_face_globals( AH_Face_Globals* globals )
+ {
+ FT_Face face = globals->face;
+ FT_Memory memory = face->memory;
+
+
+ FREE( globals );
+ }
+
+
+ static
+ FT_Error ah_hinter_load( AH_Hinter* hinter,
+ FT_UInt glyph_index,
+ FT_UInt load_flags,
+ FT_UInt depth )
+ {
+ FT_Face face = hinter->face;
+ FT_GlyphSlot slot = face->glyph;
+ FT_Fixed x_scale = face->size->metrics.x_scale;
+ FT_Fixed y_scale = face->size->metrics.y_scale;
+ FT_Glyph_Metrics metrics; /* temporary metrics */
+ FT_Error error;
+ AH_Outline* outline = hinter->glyph;
+ AH_Loader* gloader = hinter->loader;
+ FT_Bool no_horz_hints =
+ ( load_flags & AH_HINT_NO_HORZ_EDGES ) != 0;
+ FT_Bool no_vert_hints =
+ ( load_flags & AH_HINT_NO_VERT_EDGES ) != 0;
+
+
+ /* load the glyph */
+ error = FT_Load_Glyph( face, glyph_index, load_flags );
+ if ( error )
+ goto Exit;
+
+ /* save current glyph metrics */
+ metrics = slot->metrics;
+
+ switch ( slot->format )
+ {
+ case ft_glyph_format_outline:
+ /* first of all, copy the outline points in the loader's current */
+ /* extra points, which is used to keep original glyph coordinates */
+ error = ah_loader_check_points( gloader, slot->outline.n_points + 2,
+ slot->outline.n_contours );
+ if ( error )
+ goto Exit;
+
+ MEM_Copy( gloader->current.extra_points, slot->outline.points,
+ slot->outline.n_points * sizeof ( FT_Vector ) );
+
+ MEM_Copy( gloader->current.outline.contours, slot->outline.contours,
+ slot->outline.n_contours * sizeof ( short ) );
+
+ MEM_Copy( gloader->current.outline.tags, slot->outline.tags,
+ slot->outline.n_points * sizeof ( char ) );
+
+ gloader->current.outline.n_points = slot->outline.n_points;
+ gloader->current.outline.n_contours = slot->outline.n_contours;
+
+ /* compute original phantom points */
+ hinter->pp1.x = 0;
+ hinter->pp1.y = 0;
+ hinter->pp2.x = FT_MulFix( slot->metrics.horiAdvance, x_scale );
+ hinter->pp2.y = 0;
+
+ /* be sure to check for spacing glyphs */
+ if ( slot->outline.n_points == 0 )
+ goto Hint_Metrics;
+
+ /* now, load the slot image into the auto-outline, and run the */
+ /* automatic hinting process */
+ error = ah_outline_load( outline, face ); /* XXX: change to slot */
+ if ( error )
+ goto Exit;
+
+ /* perform feature detection */
+ ah_outline_detect_features( outline );
+
+ if ( !no_horz_hints )
+ {
+ ah_outline_compute_blue_edges( outline, hinter->globals );
+ ah_outline_scale_blue_edges( outline, hinter->globals );
+ }
+
+ /* perform alignment control */
+ ah_hinter_hint_edges( hinter, no_horz_hints, no_vert_hints );
+ ah_hinter_align( hinter );
+
+ /* now save the current outline into the loader's current table */
+ ah_outline_save( outline, gloader );
+
+ /* we now need to hint the metrics according to the change in */
+ /* width/positioning that occured during the hinting process */
+ {
+ FT_Pos old_width, new_width;
+ FT_Pos old_advance, new_advance;
+ FT_Pos old_lsb, new_lsb;
+ AH_Edge* edge1 = outline->vert_edges; /* leftmost edge */
+ AH_Edge* edge2 = edge1 +
+ outline->num_vedges - 1; /* rightmost edge */
+
+
+ old_width = edge2->opos - edge1->opos;
+ new_width = edge2->pos - edge1->pos;
+
+ old_advance = hinter->pp2.x;
+ old_lsb = edge1->opos;
+ new_lsb = edge1->pos;
+
+ new_advance = old_advance +
+ ( new_width + new_lsb - old_width - old_lsb );
+
+ hinter->pp1.x = ( ( new_lsb - old_lsb ) + 32 ) & -64;
+ hinter->pp2.x = ( ( edge2->pos +
+ ( old_advance - edge2->opos ) ) + 32 ) & -64;
+ }
+
+ /* good, we simply add the glyph to our loader's base */
+ ah_loader_add( gloader );
+ break;
+
+ case ft_glyph_format_composite:
+ {
+ FT_UInt nn, num_subglyphs = slot->num_subglyphs;
+ FT_UInt num_base_subgs, start_point, start_contour;
+ FT_SubGlyph* subglyph;
+
+
+ start_point = gloader->base.outline.n_points;
+ start_contour = gloader->base.outline.n_contours;
+
+ /* first of all, copy the subglyph descriptors in the glyph loader */
+ error = ah_loader_check_subglyphs( gloader, num_subglyphs );
+ if ( error )
+ goto Exit;
+
+ MEM_Copy( gloader->current.subglyphs, slot->subglyphs,
+ num_subglyphs * sizeof ( FT_SubGlyph ) );
+
+ gloader->current.num_subglyphs = num_subglyphs;
+ num_base_subgs = gloader->base.num_subglyphs;
+
+ /* now, read each subglyph independently */
+ for ( nn = 0; nn < num_subglyphs; nn++ )
+ {
+ FT_Vector pp1, pp2;
+ FT_Pos x, y;
+ FT_UInt num_points, num_new_points, num_base_points;
+
+
+ /* gloader.current.subglyphs can change during glyph loading due */
+ /* to re-allocation -- we must recompute the current subglyph on */
+ /* each iteration */
+ subglyph = gloader->base.subglyphs + num_base_subgs + nn;
+
+ pp1 = hinter->pp1;
+ pp2 = hinter->pp2;
+
+ num_base_points = gloader->base.outline.n_points;
+
+ error = ah_hinter_load( hinter, subglyph->index,
+ load_flags, depth + 1 );
+ if ( error )
+ goto Exit;
+
+ /* recompute subglyph pointer */
+ subglyph = gloader->base.subglyphs + num_base_subgs + nn;
+
+ if ( subglyph->flags & FT_SUBGLYPH_FLAG_USE_MY_METRICS )
+ {
+ pp1 = hinter->pp1;
+ pp2 = hinter->pp2;
+ }
+ else
+ {
+ hinter->pp1 = pp1;
+ hinter->pp2 = pp2;
+ }
+
+ num_points = gloader->base.outline.n_points;
+ num_new_points = num_points - num_base_points;
+
+ /* now perform the transform required for this subglyph */
+
+ if ( subglyph->flags & ( FT_SUBGLYPH_FLAG_SCALE |
+ FT_SUBGLYPH_FLAG_XY_SCALE |
+ FT_SUBGLYPH_FLAG_2X2 ) )
+ {
+ FT_Vector* cur = gloader->base.outline.points +
+ num_base_points;
+ FT_Vector* org = gloader->base.extra_points +
+ num_base_points;
+ FT_Vector* limit = cur + num_new_points;
+
+
+ for ( ; cur < limit; cur++, org++ )
+ {
+ FT_Vector_Transform( cur, &subglyph->transform );
+ FT_Vector_Transform( org, &subglyph->transform );
+ }
+ }
+
+ /* apply offset */
+
+ if ( !( subglyph->flags & FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES ) )
+ {
+ FT_Int k = subglyph->arg1;
+ FT_UInt l = subglyph->arg2;
+ FT_Vector* p1;
+ FT_Vector* p2;
+
+
+ if ( start_point + k >= num_base_points ||
+ l >= (FT_UInt)num_new_points )
+ {
+ error = FT_Err_Invalid_Composite;
+ goto Exit;
+ }
+
+ l += num_base_points;
+
+ /* for now, only use the current point coordinates */
+ /* we may consider another approach in the near future */
+ p1 = gloader->base.outline.points + start_point + k;
+ p2 = gloader->base.outline.points + start_point + l;
+
+ x = p1->x - p2->x;
+ y = p1->y - p2->y;
+ }
+ else
+ {
+ x = FT_MulFix( subglyph->arg1, x_scale );
+ y = FT_MulFix( subglyph->arg2, y_scale );
+
+ x = ( x + 32 ) & -64;
+ y = ( y + 32 ) & -64;
+ }
+
+ {
+ FT_Outline dummy = gloader->base.outline;
+
+
+ dummy.points += num_base_points;
+ dummy.n_points = num_new_points;
+
+ FT_Outline_Translate( &dummy, x, y );
+ }
+ }
+ }
+ break;
+
+ default:
+ /* we don't support other formats (yet?) */
+ error = FT_Err_Unimplemented_Feature;
+ }
+
+ Hint_Metrics:
+ if ( depth == 0 )
+ {
+ FT_BBox bbox;
+
+
+ /* we must translate our final outline by -pp1.x, and compute */
+ /* the new metrics */
+ if ( hinter->pp1.x )
+ FT_Outline_Translate( &gloader->base.outline, -hinter->pp1.x, 0 );
+
+ FT_Outline_Get_CBox( &gloader->base.outline, &bbox );
+ bbox.xMin &= -64;
+ bbox.yMin &= -64;
+ bbox.xMax = ( bbox.xMax + 63 ) & -64;
+ bbox.yMax = ( bbox.yMax + 63 ) & -64;
+
+ slot->metrics.width = bbox.xMax - bbox.xMin;
+ slot->metrics.height = bbox.yMax - bbox.yMin;
+ slot->metrics.horiBearingX = bbox.xMin;
+ slot->metrics.horiBearingY = bbox.yMax;
+ slot->metrics.horiAdvance = hinter->pp2.x - hinter->pp1.x;
+ /* XXX: TO DO - slot->linearHoriAdvance */
+
+ /* now copy outline into glyph slot */
+ ah_loader_rewind( slot->loader );
+ error = ah_loader_copy_points( slot->loader, gloader );
+ if ( error )
+ goto Exit;
+
+ slot->outline = slot->loader->base.outline;
+ slot->format = ft_glyph_format_outline;
+ }
+
+ Exit:
+ return error;
+ }
+
+
+ /* load and hint a given glyph */
+ FT_Error ah_hinter_load_glyph( AH_Hinter* hinter,
+ FT_GlyphSlot slot,
+ FT_Size size,
+ FT_UInt glyph_index,
+ FT_Int load_flags )
+ {
+ FT_Face face = slot->face;
+ FT_Error error;
+ FT_Fixed x_scale = size->metrics.x_scale;
+ FT_Fixed y_scale = size->metrics.y_scale;
+ AH_Face_Globals* face_globals = FACE_GLOBALS( face );
+
+
+ /* first of all, we need to check that we're using the correct face and */
+ /* global hints to load the glyph */
+ if ( hinter->face != face || hinter->globals != face_globals )
+ {
+ hinter->face = face;
+ if ( !face_globals )
+ {
+ error = ah_hinter_new_face_globals( hinter, face, 0 );
+ if ( error )
+ goto Exit;
+ }
+ hinter->globals = FACE_GLOBALS( face );
+ face_globals = FACE_GLOBALS( face );
+ }
+
+ /* now, we must check the current character pixel size to see if we */
+ /* need to rescale the global metrics */
+ if ( face_globals->x_scale != x_scale ||
+ face_globals->y_scale != y_scale )
+ ah_hinter_scale_globals( hinter, x_scale, y_scale );
+
+ load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_RECURSE;
+
+ ah_loader_rewind( hinter->loader );
+
+ error = ah_hinter_load( hinter, glyph_index, load_flags, 0 );
+
+ Exit:
+ return error;
+ }
+
+
+ /* retrieve a face's autohint globals for client applications */
+ void ah_hinter_get_global_hints( AH_Hinter* hinter,
+ FT_Face face,
+ void** global_hints,
+ long* global_len )
+ {
+ AH_Globals* globals = 0;
+ FT_Memory memory = hinter->memory;
+ FT_Error error;
+
+
+ /* allocate new master globals */
+ if ( ALLOC( globals, sizeof ( *globals ) ) )
+ goto Fail;
+
+ /* compute face globals if needed */
+ if ( !FACE_GLOBALS( face ) )
+ {
+ error = ah_hinter_new_face_globals( hinter, face, 0 );
+ if ( error )
+ goto Fail;
+ }
+
+ *globals = FACE_GLOBALS( face )->design;
+ *global_hints = globals;
+ *global_len = sizeof( *globals );
+
+ return;
+
+ Fail:
+ FREE( globals );
+
+ *global_hints = 0;
+ *global_len = 0;
+ }
+
+
+ void ah_hinter_done_global_hints( AH_Hinter* hinter,
+ void* global_hints )
+ {
+ FT_Memory memory = hinter->memory;
+
+
+ FREE( global_hints );
+ }
+
+
+/* END */
projects / wxWidgets.git / blobdiff