/***************************************************************************/ | |
/* */ | |
/* afhints.c */ | |
/* */ | |
/* Auto-fitter hinting routines (body). */ | |
/* */ | |
/* Copyright 2003, 2004, 2005, 2006, 2007, 2009 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 "afhints.h" | |
#include "aferrors.h" | |
#include FT_INTERNAL_CALC_H | |
FT_LOCAL_DEF( FT_Error ) | |
af_axis_hints_new_segment( AF_AxisHints axis, | |
FT_Memory memory, | |
AF_Segment *asegment ) | |
{ | |
FT_Error error = AF_Err_Ok; | |
AF_Segment segment = NULL; | |
if ( axis->num_segments >= axis->max_segments ) | |
{ | |
FT_Int old_max = axis->max_segments; | |
FT_Int new_max = old_max; | |
FT_Int big_max = FT_INT_MAX / sizeof ( *segment ); | |
if ( old_max >= big_max ) | |
{ | |
error = AF_Err_Out_Of_Memory; | |
goto Exit; | |
} | |
new_max += ( new_max >> 2 ) + 4; | |
if ( new_max < old_max || new_max > big_max ) | |
new_max = big_max; | |
if ( FT_RENEW_ARRAY( axis->segments, old_max, new_max ) ) | |
goto Exit; | |
axis->max_segments = new_max; | |
} | |
segment = axis->segments + axis->num_segments++; | |
Exit: | |
*asegment = segment; | |
return error; | |
} | |
FT_LOCAL( FT_Error ) | |
af_axis_hints_new_edge( AF_AxisHints axis, | |
FT_Int fpos, | |
AF_Direction dir, | |
FT_Memory memory, | |
AF_Edge *aedge ) | |
{ | |
FT_Error error = AF_Err_Ok; | |
AF_Edge edge = NULL; | |
AF_Edge edges; | |
if ( axis->num_edges >= axis->max_edges ) | |
{ | |
FT_Int old_max = axis->max_edges; | |
FT_Int new_max = old_max; | |
FT_Int big_max = FT_INT_MAX / sizeof ( *edge ); | |
if ( old_max >= big_max ) | |
{ | |
error = AF_Err_Out_Of_Memory; | |
goto Exit; | |
} | |
new_max += ( new_max >> 2 ) + 4; | |
if ( new_max < old_max || new_max > big_max ) | |
new_max = big_max; | |
if ( FT_RENEW_ARRAY( axis->edges, old_max, new_max ) ) | |
goto Exit; | |
axis->max_edges = new_max; | |
} | |
edges = axis->edges; | |
edge = edges + axis->num_edges; | |
while ( edge > edges ) | |
{ | |
if ( edge[-1].fpos < fpos ) | |
break; | |
/* we want the edge with same position and minor direction */ | |
/* to appear before those in the major one in the list */ | |
if ( edge[-1].fpos == fpos && dir == axis->major_dir ) | |
break; | |
edge[0] = edge[-1]; | |
edge--; | |
} | |
axis->num_edges++; | |
FT_ZERO( edge ); | |
edge->fpos = (FT_Short)fpos; | |
edge->dir = (FT_Char)dir; | |
Exit: | |
*aedge = edge; | |
return error; | |
} | |
#ifdef AF_DEBUG | |
#include FT_CONFIG_STANDARD_LIBRARY_H | |
static const char* | |
af_dir_str( AF_Direction dir ) | |
{ | |
const char* result; | |
switch ( dir ) | |
{ | |
case AF_DIR_UP: | |
result = "up"; | |
break; | |
case AF_DIR_DOWN: | |
result = "down"; | |
break; | |
case AF_DIR_LEFT: | |
result = "left"; | |
break; | |
case AF_DIR_RIGHT: | |
result = "right"; | |
break; | |
default: | |
result = "none"; | |
} | |
return result; | |
} | |
#define AF_INDEX_NUM( ptr, base ) ( (ptr) ? ( (ptr) - (base) ) : -1 ) | |
void | |
af_glyph_hints_dump_points( AF_GlyphHints hints ) | |
{ | |
AF_Point points = hints->points; | |
AF_Point limit = points + hints->num_points; | |
AF_Point point; | |
printf( "Table of points:\n" ); | |
printf( " [ index | xorg | yorg | xscale | yscale " | |
"| xfit | yfit | flags ]\n" ); | |
for ( point = points; point < limit; point++ ) | |
{ | |
printf( " [ %5d | %5d | %5d | %-5.2f | %-5.2f " | |
"| %-5.2f | %-5.2f | %c%c%c%c%c%c ]\n", | |
point - points, | |
point->fx, | |
point->fy, | |
point->ox/64.0, | |
point->oy/64.0, | |
point->x/64.0, | |
point->y/64.0, | |
( point->flags & AF_FLAG_WEAK_INTERPOLATION ) ? 'w' : ' ', | |
( point->flags & AF_FLAG_INFLECTION ) ? 'i' : ' ', | |
( point->flags & AF_FLAG_EXTREMA_X ) ? '<' : ' ', | |
( point->flags & AF_FLAG_EXTREMA_Y ) ? 'v' : ' ', | |
( point->flags & AF_FLAG_ROUND_X ) ? '(' : ' ', | |
( point->flags & AF_FLAG_ROUND_Y ) ? 'u' : ' '); | |
} | |
printf( "\n" ); | |
} | |
static const char* | |
af_edge_flags_to_string( AF_Edge_Flags flags ) | |
{ | |
static char temp[32]; | |
int pos = 0; | |
if ( flags & AF_EDGE_ROUND ) | |
{ | |
ft_memcpy( temp + pos, "round", 5 ); | |
pos += 5; | |
} | |
if ( flags & AF_EDGE_SERIF ) | |
{ | |
if ( pos > 0 ) | |
temp[pos++] = ' '; | |
ft_memcpy( temp + pos, "serif", 5 ); | |
pos += 5; | |
} | |
if ( pos == 0 ) | |
return "normal"; | |
temp[pos] = 0; | |
return temp; | |
} | |
/* A function to dump the array of linked segments. */ | |
void | |
af_glyph_hints_dump_segments( AF_GlyphHints hints ) | |
{ | |
FT_Int dimension; | |
for ( dimension = 1; dimension >= 0; dimension-- ) | |
{ | |
AF_AxisHints axis = &hints->axis[dimension]; | |
AF_Segment segments = axis->segments; | |
AF_Segment limit = segments + axis->num_segments; | |
AF_Segment seg; | |
printf ( "Table of %s segments:\n", | |
dimension == AF_DIMENSION_HORZ ? "vertical" : "horizontal" ); | |
printf ( " [ index | pos | dir | link | serif |" | |
" height | extra | flags ]\n" ); | |
for ( seg = segments; seg < limit; seg++ ) | |
{ | |
printf ( " [ %5d | %5.2g | %5s | %4d | %5d | %5d | %5d | %s ]\n", | |
seg - segments, | |
dimension == AF_DIMENSION_HORZ ? (int)seg->first->ox / 64.0 | |
: (int)seg->first->oy / 64.0, | |
af_dir_str( (AF_Direction)seg->dir ), | |
AF_INDEX_NUM( seg->link, segments ), | |
AF_INDEX_NUM( seg->serif, segments ), | |
seg->height, | |
seg->height - ( seg->max_coord - seg->min_coord ), | |
af_edge_flags_to_string( seg->flags ) ); | |
} | |
printf( "\n" ); | |
} | |
} | |
void | |
af_glyph_hints_dump_edges( AF_GlyphHints hints ) | |
{ | |
FT_Int dimension; | |
for ( dimension = 1; dimension >= 0; dimension-- ) | |
{ | |
AF_AxisHints axis = &hints->axis[dimension]; | |
AF_Edge edges = axis->edges; | |
AF_Edge limit = edges + axis->num_edges; | |
AF_Edge edge; | |
/* | |
* note: AF_DIMENSION_HORZ corresponds to _vertical_ edges | |
* since they have constant a X coordinate. | |
*/ | |
printf ( "Table of %s edges:\n", | |
dimension == AF_DIMENSION_HORZ ? "vertical" : "horizontal" ); | |
printf ( " [ index | pos | dir | link |" | |
" serif | blue | opos | pos | flags ]\n" ); | |
for ( edge = edges; edge < limit; edge++ ) | |
{ | |
printf ( " [ %5d | %5.2g | %5s | %4d |" | |
" %5d | %c | %5.2f | %5.2f | %s ]\n", | |
edge - edges, | |
(int)edge->opos / 64.0, | |
af_dir_str( (AF_Direction)edge->dir ), | |
AF_INDEX_NUM( edge->link, edges ), | |
AF_INDEX_NUM( edge->serif, edges ), | |
edge->blue_edge ? 'y' : 'n', | |
edge->opos / 64.0, | |
edge->pos / 64.0, | |
af_edge_flags_to_string( edge->flags ) ); | |
} | |
printf( "\n" ); | |
} | |
} | |
#else /* !AF_DEBUG */ | |
/* these empty stubs are only used to link the `ftgrid' test program */ | |
/* when debugging is disabled */ | |
void | |
af_glyph_hints_dump_points( AF_GlyphHints hints ) | |
{ | |
FT_UNUSED( hints ); | |
} | |
void | |
af_glyph_hints_dump_segments( AF_GlyphHints hints ) | |
{ | |
FT_UNUSED( hints ); | |
} | |
void | |
af_glyph_hints_dump_edges( AF_GlyphHints hints ) | |
{ | |
FT_UNUSED( hints ); | |
} | |
#endif /* !AF_DEBUG */ | |
/* compute the direction value of a given vector */ | |
FT_LOCAL_DEF( AF_Direction ) | |
af_direction_compute( FT_Pos dx, | |
FT_Pos dy ) | |
{ | |
FT_Pos ll, ss; /* long and short arm lengths */ | |
AF_Direction dir; /* candidate direction */ | |
if ( dy >= dx ) | |
{ | |
if ( dy >= -dx ) | |
{ | |
dir = AF_DIR_UP; | |
ll = dy; | |
ss = dx; | |
} | |
else | |
{ | |
dir = AF_DIR_LEFT; | |
ll = -dx; | |
ss = dy; | |
} | |
} | |
else /* dy < dx */ | |
{ | |
if ( dy >= -dx ) | |
{ | |
dir = AF_DIR_RIGHT; | |
ll = dx; | |
ss = dy; | |
} | |
else | |
{ | |
dir = AF_DIR_DOWN; | |
ll = dy; | |
ss = dx; | |
} | |
} | |
ss *= 14; | |
if ( FT_ABS( ll ) <= FT_ABS( ss ) ) | |
dir = AF_DIR_NONE; | |
return dir; | |
} | |
/* compute all inflex points in a given glyph */ | |
static void | |
af_glyph_hints_compute_inflections( AF_GlyphHints hints ) | |
{ | |
AF_Point* contour = hints->contours; | |
AF_Point* contour_limit = contour + hints->num_contours; | |
/* do each contour separately */ | |
for ( ; contour < contour_limit; contour++ ) | |
{ | |
AF_Point point = contour[0]; | |
AF_Point first = point; | |
AF_Point start = point; | |
AF_Point end = point; | |
AF_Point before; | |
AF_Point after; | |
FT_Pos in_x, in_y, out_x, out_y; | |
AF_Angle orient_prev, orient_cur; | |
FT_Int finished = 0; | |
/* compute first segment in contour */ | |
first = point; | |
start = end = first; | |
do | |
{ | |
end = end->next; | |
if ( end == first ) | |
goto Skip; | |
in_x = end->fx - start->fx; | |
in_y = end->fy - start->fy; | |
} 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->fx - before->fx; | |
out_y = start->fy - before->fy; | |
} while ( out_x == 0 && out_y == 0 ); | |
orient_prev = ft_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->fx - end->fx; | |
out_y = after->fy - end->fy; | |
} while ( out_x == 0 && out_y == 0 ); | |
orient_cur = ft_corner_orientation( in_x, in_y, out_x, out_y ); | |
} while ( orient_cur == 0 ); | |
if ( ( orient_prev + orient_cur ) == 0 ) | |
{ | |
/* we have an inflection point here */ | |
do | |
{ | |
start->flags |= AF_FLAG_INFLECTION; | |
start = start->next; | |
} while ( start != end ); | |
start->flags |= AF_FLAG_INFLECTION; | |
} | |
start = end; | |
end = after; | |
orient_prev = orient_cur; | |
in_x = out_x; | |
in_y = out_y; | |
} while ( !finished ); | |
Skip: | |
; | |
} | |
} | |
FT_LOCAL_DEF( void ) | |
af_glyph_hints_init( AF_GlyphHints hints, | |
FT_Memory memory ) | |
{ | |
FT_ZERO( hints ); | |
hints->memory = memory; | |
} | |
FT_LOCAL_DEF( void ) | |
af_glyph_hints_done( AF_GlyphHints hints ) | |
{ | |
if ( hints && hints->memory ) | |
{ | |
FT_Memory memory = hints->memory; | |
int dim; | |
/* | |
* note that we don't need to free the segment and edge | |
* buffers, since they are really within the hints->points array | |
*/ | |
for ( dim = 0; dim < AF_DIMENSION_MAX; dim++ ) | |
{ | |
AF_AxisHints axis = &hints->axis[dim]; | |
axis->num_segments = 0; | |
axis->max_segments = 0; | |
FT_FREE( axis->segments ); | |
axis->num_edges = 0; | |
axis->max_edges = 0; | |
FT_FREE( axis->edges ); | |
} | |
FT_FREE( hints->contours ); | |
hints->max_contours = 0; | |
hints->num_contours = 0; | |
FT_FREE( hints->points ); | |
hints->num_points = 0; | |
hints->max_points = 0; | |
hints->memory = NULL; | |
} | |
} | |
FT_LOCAL_DEF( void ) | |
af_glyph_hints_rescale( AF_GlyphHints hints, | |
AF_ScriptMetrics metrics ) | |
{ | |
hints->metrics = metrics; | |
hints->scaler_flags = metrics->scaler.flags; | |
} | |
FT_LOCAL_DEF( FT_Error ) | |
af_glyph_hints_reload( AF_GlyphHints hints, | |
FT_Outline* outline, | |
FT_Bool get_inflections ) | |
{ | |
FT_Error error = AF_Err_Ok; | |
AF_Point points; | |
FT_UInt old_max, new_max; | |
FT_Fixed x_scale = hints->x_scale; | |
FT_Fixed y_scale = hints->y_scale; | |
FT_Pos x_delta = hints->x_delta; | |
FT_Pos y_delta = hints->y_delta; | |
FT_Memory memory = hints->memory; | |
hints->num_points = 0; | |
hints->num_contours = 0; | |
hints->axis[0].num_segments = 0; | |
hints->axis[0].num_edges = 0; | |
hints->axis[1].num_segments = 0; | |
hints->axis[1].num_edges = 0; | |
/* first of all, reallocate the contours array when necessary */ | |
new_max = (FT_UInt)outline->n_contours; | |
old_max = hints->max_contours; | |
if ( new_max > old_max ) | |
{ | |
new_max = ( new_max + 3 ) & ~3; | |
if ( FT_RENEW_ARRAY( hints->contours, old_max, new_max ) ) | |
goto Exit; | |
hints->max_contours = new_max; | |
} | |
/* | |
* then reallocate the points arrays if necessary -- | |
* note that we reserve two additional point positions, used to | |
* hint metrics appropriately | |
*/ | |
new_max = (FT_UInt)( outline->n_points + 2 ); | |
old_max = hints->max_points; | |
if ( new_max > old_max ) | |
{ | |
new_max = ( new_max + 2 + 7 ) & ~7; | |
if ( FT_RENEW_ARRAY( hints->points, old_max, new_max ) ) | |
goto Exit; | |
hints->max_points = new_max; | |
} | |
hints->num_points = outline->n_points; | |
hints->num_contours = outline->n_contours; | |
/* We can't rely on the value of `FT_Outline.flags' to know the fill */ | |
/* direction used for a glyph, given that some fonts are broken (e.g., */ | |
/* the Arphic ones). We thus recompute it each time we need to. */ | |
/* */ | |
hints->axis[AF_DIMENSION_HORZ].major_dir = AF_DIR_UP; | |
hints->axis[AF_DIMENSION_VERT].major_dir = AF_DIR_LEFT; | |
if ( FT_Outline_Get_Orientation( outline ) == FT_ORIENTATION_POSTSCRIPT ) | |
{ | |
hints->axis[AF_DIMENSION_HORZ].major_dir = AF_DIR_DOWN; | |
hints->axis[AF_DIMENSION_VERT].major_dir = AF_DIR_RIGHT; | |
} | |
hints->x_scale = x_scale; | |
hints->y_scale = y_scale; | |
hints->x_delta = x_delta; | |
hints->y_delta = y_delta; | |
hints->xmin_delta = 0; | |
hints->xmax_delta = 0; | |
points = hints->points; | |
if ( hints->num_points == 0 ) | |
goto Exit; | |
{ | |
AF_Point point; | |
AF_Point point_limit = points + hints->num_points; | |
/* compute coordinates & Bezier flags, next and prev */ | |
{ | |
FT_Vector* vec = outline->points; | |
char* tag = outline->tags; | |
AF_Point first = points; | |
AF_Point end = points + outline->contours[0]; | |
AF_Point prev = end; | |
FT_Int contour_index = 0; | |
for ( point = points; point < point_limit; point++, vec++, tag++ ) | |
{ | |
point->fx = (FT_Short)vec->x; | |
point->fy = (FT_Short)vec->y; | |
point->ox = point->x = FT_MulFix( vec->x, x_scale ) + x_delta; | |
point->oy = point->y = FT_MulFix( vec->y, y_scale ) + y_delta; | |
switch ( FT_CURVE_TAG( *tag ) ) | |
{ | |
case FT_CURVE_TAG_CONIC: | |
point->flags = AF_FLAG_CONIC; | |
break; | |
case FT_CURVE_TAG_CUBIC: | |
point->flags = AF_FLAG_CUBIC; | |
break; | |
default: | |
point->flags = 0; | |
} | |
point->prev = prev; | |
prev->next = point; | |
prev = point; | |
if ( point == end ) | |
{ | |
if ( ++contour_index < outline->n_contours ) | |
{ | |
first = point + 1; | |
end = points + outline->contours[contour_index]; | |
prev = end; | |
} | |
} | |
} | |
} | |
/* set-up the contours array */ | |
{ | |
AF_Point* contour = hints->contours; | |
AF_Point* contour_limit = contour + hints->num_contours; | |
short* end = outline->contours; | |
short idx = 0; | |
for ( ; contour < contour_limit; contour++, end++ ) | |
{ | |
contour[0] = points + idx; | |
idx = (short)( end[0] + 1 ); | |
} | |
} | |
/* compute directions of in & out vectors */ | |
{ | |
AF_Point first = points; | |
AF_Point prev = NULL; | |
FT_Pos in_x = 0; | |
FT_Pos in_y = 0; | |
AF_Direction in_dir = AF_DIR_NONE; | |
for ( point = points; point < point_limit; point++ ) | |
{ | |
AF_Point next; | |
FT_Pos out_x, out_y; | |
if ( point == first ) | |
{ | |
prev = first->prev; | |
in_x = first->fx - prev->fx; | |
in_y = first->fy - prev->fy; | |
in_dir = af_direction_compute( in_x, in_y ); | |
first = prev + 1; | |
} | |
point->in_dir = (FT_Char)in_dir; | |
next = point->next; | |
out_x = next->fx - point->fx; | |
out_y = next->fy - point->fy; | |
in_dir = af_direction_compute( out_x, out_y ); | |
point->out_dir = (FT_Char)in_dir; | |
if ( point->flags & ( AF_FLAG_CONIC | AF_FLAG_CUBIC ) ) | |
{ | |
Is_Weak_Point: | |
point->flags |= AF_FLAG_WEAK_INTERPOLATION; | |
} | |
else if ( point->out_dir == point->in_dir ) | |
{ | |
if ( point->out_dir != AF_DIR_NONE ) | |
goto Is_Weak_Point; | |
if ( ft_corner_is_flat( in_x, in_y, out_x, out_y ) ) | |
goto Is_Weak_Point; | |
} | |
else if ( point->in_dir == -point->out_dir ) | |
goto Is_Weak_Point; | |
in_x = out_x; | |
in_y = out_y; | |
prev = point; | |
} | |
} | |
} | |
/* compute inflection points -- */ | |
/* disabled due to no longer perceived benefits */ | |
if ( 0 && get_inflections ) | |
af_glyph_hints_compute_inflections( hints ); | |
Exit: | |
return error; | |
} | |
FT_LOCAL_DEF( void ) | |
af_glyph_hints_save( AF_GlyphHints hints, | |
FT_Outline* outline ) | |
{ | |
AF_Point point = hints->points; | |
AF_Point limit = point + hints->num_points; | |
FT_Vector* vec = outline->points; | |
char* tag = outline->tags; | |
for ( ; point < limit; point++, vec++, tag++ ) | |
{ | |
vec->x = point->x; | |
vec->y = point->y; | |
if ( point->flags & AF_FLAG_CONIC ) | |
tag[0] = FT_CURVE_TAG_CONIC; | |
else if ( point->flags & AF_FLAG_CUBIC ) | |
tag[0] = FT_CURVE_TAG_CUBIC; | |
else | |
tag[0] = FT_CURVE_TAG_ON; | |
} | |
} | |
/**************************************************************** | |
* | |
* EDGE POINT GRID-FITTING | |
* | |
****************************************************************/ | |
FT_LOCAL_DEF( void ) | |
af_glyph_hints_align_edge_points( AF_GlyphHints hints, | |
AF_Dimension dim ) | |
{ | |
AF_AxisHints axis = & hints->axis[dim]; | |
AF_Segment segments = axis->segments; | |
AF_Segment segment_limit = segments + axis->num_segments; | |
AF_Segment seg; | |
if ( dim == AF_DIMENSION_HORZ ) | |
{ | |
for ( seg = segments; seg < segment_limit; seg++ ) | |
{ | |
AF_Edge edge = seg->edge; | |
AF_Point point, first, last; | |
if ( edge == NULL ) | |
continue; | |
first = seg->first; | |
last = seg->last; | |
point = first; | |
for (;;) | |
{ | |
point->x = edge->pos; | |
point->flags |= AF_FLAG_TOUCH_X; | |
if ( point == last ) | |
break; | |
point = point->next; | |
} | |
} | |
} | |
else | |
{ | |
for ( seg = segments; seg < segment_limit; seg++ ) | |
{ | |
AF_Edge edge = seg->edge; | |
AF_Point point, first, last; | |
if ( edge == NULL ) | |
continue; | |
first = seg->first; | |
last = seg->last; | |
point = first; | |
for (;;) | |
{ | |
point->y = edge->pos; | |
point->flags |= AF_FLAG_TOUCH_Y; | |
if ( point == last ) | |
break; | |
point = point->next; | |
} | |
} | |
} | |
} | |
/**************************************************************** | |
* | |
* STRONG POINT INTERPOLATION | |
* | |
****************************************************************/ | |
/* hint the strong points -- this is equivalent to the TrueType `IP' */ | |
/* hinting instruction */ | |
FT_LOCAL_DEF( void ) | |
af_glyph_hints_align_strong_points( AF_GlyphHints hints, | |
AF_Dimension dim ) | |
{ | |
AF_Point points = hints->points; | |
AF_Point point_limit = points + hints->num_points; | |
AF_AxisHints axis = &hints->axis[dim]; | |
AF_Edge edges = axis->edges; | |
AF_Edge edge_limit = edges + axis->num_edges; | |
AF_Flags touch_flag; | |
if ( dim == AF_DIMENSION_HORZ ) | |
touch_flag = AF_FLAG_TOUCH_X; | |
else | |
touch_flag = AF_FLAG_TOUCH_Y; | |
if ( edges < edge_limit ) | |
{ | |
AF_Point point; | |
AF_Edge edge; | |
for ( point = points; point < point_limit; point++ ) | |
{ | |
FT_Pos u, ou, fu; /* point position */ | |
FT_Pos delta; | |
if ( point->flags & touch_flag ) | |
continue; | |
/* if this point is candidate to weak interpolation, we */ | |
/* interpolate it after all strong points have been processed */ | |
if ( ( point->flags & AF_FLAG_WEAK_INTERPOLATION ) && | |
!( point->flags & AF_FLAG_INFLECTION ) ) | |
continue; | |
if ( dim == AF_DIMENSION_VERT ) | |
{ | |
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; | |
} | |
{ | |
FT_UInt min, max, mid; | |
FT_Pos fpos; | |
/* find enclosing edges */ | |
min = 0; | |
max = edge_limit - edges; | |
#if 1 | |
/* for small edge counts, a linear search is better */ | |
if ( max <= 8 ) | |
{ | |
FT_UInt nn; | |
for ( nn = 0; nn < max; nn++ ) | |
if ( edges[nn].fpos >= u ) | |
break; | |
if ( edges[nn].fpos == u ) | |
{ | |
u = edges[nn].pos; | |
goto Store_Point; | |
} | |
min = nn; | |
} | |
else | |
#endif | |
while ( min < max ) | |
{ | |
mid = ( max + min ) >> 1; | |
edge = edges + mid; | |
fpos = edge->fpos; | |
if ( u < fpos ) | |
max = mid; | |
else if ( u > fpos ) | |
min = mid + 1; | |
else | |
{ | |
/* we are on the edge */ | |
u = edge->pos; | |
goto Store_Point; | |
} | |
} | |
{ | |
AF_Edge before = edges + min - 1; | |
AF_Edge after = edges + min + 0; | |
/* assert( before && after && before != after ) */ | |
if ( before->scale == 0 ) | |
before->scale = FT_DivFix( after->pos - before->pos, | |
after->fpos - before->fpos ); | |
u = before->pos + FT_MulFix( fu - before->fpos, | |
before->scale ); | |
} | |
} | |
Store_Point: | |
/* save the point position */ | |
if ( dim == AF_DIMENSION_HORZ ) | |
point->x = u; | |
else | |
point->y = u; | |
point->flags |= touch_flag; | |
} | |
} | |
} | |
/**************************************************************** | |
* | |
* WEAK POINT INTERPOLATION | |
* | |
****************************************************************/ | |
static void | |
af_iup_shift( AF_Point p1, | |
AF_Point p2, | |
AF_Point ref ) | |
{ | |
AF_Point p; | |
FT_Pos delta = ref->u - ref->v; | |
if ( delta == 0 ) | |
return; | |
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 | |
af_iup_interp( AF_Point p1, | |
AF_Point p2, | |
AF_Point ref1, | |
AF_Point ref2 ) | |
{ | |
AF_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++ ) | |
{ | |
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; | |
} | |
} | |
} | |
FT_LOCAL_DEF( void ) | |
af_glyph_hints_align_weak_points( AF_GlyphHints hints, | |
AF_Dimension dim ) | |
{ | |
AF_Point points = hints->points; | |
AF_Point point_limit = points + hints->num_points; | |
AF_Point* contour = hints->contours; | |
AF_Point* contour_limit = contour + hints->num_contours; | |
AF_Flags touch_flag; | |
AF_Point point; | |
AF_Point end_point; | |
AF_Point first_point; | |
/* PASS 1: Move segment points to edge positions */ | |
if ( dim == AF_DIMENSION_HORZ ) | |
{ | |
touch_flag = AF_FLAG_TOUCH_X; | |
for ( point = points; point < point_limit; point++ ) | |
{ | |
point->u = point->x; | |
point->v = point->ox; | |
} | |
} | |
else | |
{ | |
touch_flag = AF_FLAG_TOUCH_Y; | |
for ( point = points; point < point_limit; point++ ) | |
{ | |
point->u = point->y; | |
point->v = point->oy; | |
} | |
} | |
point = points; | |
for ( ; contour < contour_limit; contour++ ) | |
{ | |
AF_Point first_touched, last_touched; | |
point = *contour; | |
end_point = point->prev; | |
first_point = point; | |
/* find first touched point */ | |
for (;;) | |
{ | |
if ( point > end_point ) /* no touched point in contour */ | |
goto NextContour; | |
if ( point->flags & touch_flag ) | |
break; | |
point++; | |
} | |
first_touched = point; | |
last_touched = point; | |
for (;;) | |
{ | |
FT_ASSERT( point <= end_point && | |
( point->flags & touch_flag ) != 0 ); | |
/* skip any touched neighbhours */ | |
while ( point < end_point && ( point[1].flags & touch_flag ) != 0 ) | |
point++; | |
last_touched = point; | |
/* find the next touched point, if any */ | |
point ++; | |
for (;;) | |
{ | |
if ( point > end_point ) | |
goto EndContour; | |
if ( ( point->flags & touch_flag ) != 0 ) | |
break; | |
point++; | |
} | |
/* interpolate between last_touched and point */ | |
af_iup_interp( last_touched + 1, point - 1, | |
last_touched, point ); | |
} | |
EndContour: | |
/* special case: only one point was touched */ | |
if ( last_touched == first_touched ) | |
{ | |
af_iup_shift( first_point, end_point, first_touched ); | |
} | |
else /* interpolate the last part */ | |
{ | |
if ( last_touched < end_point ) | |
af_iup_interp( last_touched + 1, end_point, | |
last_touched, first_touched ); | |
if ( first_touched > points ) | |
af_iup_interp( first_point, first_touched - 1, | |
last_touched, first_touched ); | |
} | |
NextContour: | |
; | |
} | |
/* now save the interpolated values back to x/y */ | |
if ( dim == AF_DIMENSION_HORZ ) | |
{ | |
for ( point = points; point < point_limit; point++ ) | |
point->x = point->u; | |
} | |
else | |
{ | |
for ( point = points; point < point_limit; point++ ) | |
point->y = point->u; | |
} | |
} | |
#ifdef AF_USE_WARPER | |
FT_LOCAL_DEF( void ) | |
af_glyph_hints_scale_dim( AF_GlyphHints hints, | |
AF_Dimension dim, | |
FT_Fixed scale, | |
FT_Pos delta ) | |
{ | |
AF_Point points = hints->points; | |
AF_Point points_limit = points + hints->num_points; | |
AF_Point point; | |
if ( dim == AF_DIMENSION_HORZ ) | |
{ | |
for ( point = points; point < points_limit; point++ ) | |
point->x = FT_MulFix( point->fx, scale ) + delta; | |
} | |
else | |
{ | |
for ( point = points; point < points_limit; point++ ) | |
point->y = FT_MulFix( point->fy, scale ) + delta; | |
} | |
} | |
#endif /* AF_USE_WARPER */ | |
/* END */ |