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freetype/src/autohint/ahhint.c

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added auto-hinter module. Note that the code has been cleaned up, and it seems a bug was introduced ??? I'll start checking this under Linux, as debugging is a lot easier under this environment..
2000-07-19 22:02:14 +02:00
/***************************************************************************/
/* */
/* ahhint.c */
/* */
/* Glyph hinter */
/* */
/* 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;
}
if (base->flags & ah_edge_done)
/* do not strengthen serifs */
{
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 );
/* outline optimiser removed temporarily */
#if 0
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'll */
/* 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 succesive 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
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;
}
}
static
void ah_hinter_align( AH_Hinter* hinter )
{
ah_hinter_align_edge_points( hinter );
ah_hinter_align_points( hinter );
}
/* finalise 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 ); /* XXXX: 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 = hinter->glyph->horz_edges; /* left-most edge */
AH_Edge* edge2 = edge1 + hinter->glyph->num_hedges-1; /* right-mode 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;
/* XXXX: 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 );
}
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