diff options
Diffstat (limited to 'src/autofit/afhints.c')
-rw-r--r-- | src/autofit/afhints.c | 109 |
1 files changed, 73 insertions, 36 deletions
diff --git a/src/autofit/afhints.c b/src/autofit/afhints.c index 56c8220..0f7f6e5 100644 --- a/src/autofit/afhints.c +++ b/src/autofit/afhints.c @@ -4,7 +4,7 @@ /* */ /* Auto-fitter hinting routines (body). */ /* */ -/* Copyright 2003-2015 by */ +/* Copyright 2003-2016 by */ /* David Turner, Robert Wilhelm, and Werner Lemberg. */ /* */ /* This file is part of the FreeType project, and may only be used, */ @@ -99,6 +99,7 @@ af_axis_hints_new_edge( AF_AxisHints axis, FT_Int fpos, AF_Direction dir, + FT_Bool top_to_bottom_hinting, FT_Memory memory, AF_Edge *anedge ) { @@ -153,7 +154,8 @@ while ( edge > edges ) { - if ( edge[-1].fpos < fpos ) + if ( top_to_bottom_hinting ? ( edge[-1].fpos > fpos ) + : ( edge[-1].fpos < fpos ) ) break; /* we want the edge with same position and minor direction */ @@ -302,16 +304,18 @@ af_glyph_hints_dump_points( AF_GlyphHints hints, FT_Bool to_stdout ) { - AF_Point points = hints->points; - AF_Point limit = points + hints->num_points; - AF_Point point; + AF_Point points = hints->points; + AF_Point limit = points + hints->num_points; + AF_Point* contour = hints->contours; + AF_Point* climit = contour + hints->num_contours; + AF_Point point; AF_DUMP(( "Table of points:\n" )); if ( hints->num_points ) - AF_DUMP(( " index hedge hseg vedge vseg flags" - " xorg yorg xscale yscale xfit yfit\n" )); + AF_DUMP(( " index hedge hseg vedge vseg flags " + " xorg yorg xscale yscale xfit yfit" )); else AF_DUMP(( " (none)\n" )); @@ -324,7 +328,14 @@ char buf1[16], buf2[16], buf3[16], buf4[16]; - AF_DUMP(( " %5d %5s %5s %5s %5s %s " + /* insert extra newline at the beginning of a contour */ + if ( contour < climit && *contour == point ) + { + AF_DUMP(( "\n" )); + contour++; + } + + AF_DUMP(( " %5d %5s %5s %5s %5s %s" " %5d %5d %7.2f %7.2f %7.2f %7.2f\n", point_idx, af_print_idx( buf1, @@ -333,8 +344,11 @@ af_print_idx( buf3, af_get_edge_index( hints, segment_idx_0, 0 ) ), af_print_idx( buf4, segment_idx_0 ), - ( point->flags & AF_FLAG_WEAK_INTERPOLATION ) ? "weak" - : " -- ", + ( point->flags & AF_FLAG_NEAR ) + ? " near " + : ( point->flags & AF_FLAG_WEAK_INTERPOLATION ) + ? " weak " + : "strong", point->fx, point->fy, @@ -406,20 +420,19 @@ dimension == AF_DIMENSION_HORZ ? "vertical" : "horizontal" )); if ( axis->num_segments ) - AF_DUMP(( " index pos dir from to" - " link serif edge" + AF_DUMP(( " index pos delta dir from to " + " link serif edge" " height extra flags\n" )); else AF_DUMP(( " (none)\n" )); for ( seg = segments; seg < limit; seg++ ) - AF_DUMP(( " %5d %5.2g %5s %4d %4d" + AF_DUMP(( " %5d %5d %5d %5s %4d %4d" " %4s %5s %4s" " %6d %5d %11s\n", AF_INDEX_NUM( seg, segments ), - dimension == AF_DIMENSION_HORZ - ? (int)seg->first->ox / 64.0 - : (int)seg->first->oy / 64.0, + seg->pos, + seg->delta, af_dir_str( (AF_Direction)seg->dir ), AF_INDEX_NUM( seg->first, points ), AF_INDEX_NUM( seg->last, points ), @@ -539,18 +552,26 @@ * note: AF_DIMENSION_HORZ corresponds to _vertical_ edges * since they have a constant X coordinate. */ - AF_DUMP(( "Table of %s edges:\n", - dimension == AF_DIMENSION_HORZ ? "vertical" - : "horizontal" )); + if ( dimension == AF_DIMENSION_HORZ ) + AF_DUMP(( "Table of %s edges (1px=%.2fu, 10u=%.2fpx):\n", + "vertical", + 65536.0 * 64.0 / hints->x_scale, + 10.0 * hints->x_scale / 65536.0 / 64.0 )); + else + AF_DUMP(( "Table of %s edges (1px=%.2fu, 10u=%.2fpx):\n", + "horizontal", + 65536.0 * 64.0 / hints->y_scale, + 10.0 * hints->y_scale / 65536.0 / 64.0 )); + if ( axis->num_edges ) - AF_DUMP(( " index pos dir link serif" - " blue opos pos flags\n" )); + AF_DUMP(( " index pos dir link serif" + " blue opos pos flags\n" )); else AF_DUMP(( " (none)\n" )); for ( edge = edges; edge < limit; edge++ ) - AF_DUMP(( " %5d %5.2g %5s %4s %5s" - " %c %5.2f %5.2f %11s\n", + AF_DUMP(( " %5d %7.2f %5s %4s %5s" + " %c %7.2f %7.2f %11s\n", AF_INDEX_NUM( edge, edges ), (int)edge->opos / 64.0, af_dir_str( (AF_Direction)edge->dir ), @@ -802,18 +823,26 @@ AF_Point point; AF_Point point_limit = points + hints->num_points; + /* value 20 in `near_limit' is heuristic */ + FT_UInt units_per_em = hints->metrics->scaler.face->units_per_EM; + FT_Int near_limit = 20 * units_per_em / 2048; + /* compute coordinates & Bezier flags, next and prev */ { FT_Vector* vec = outline->points; char* tag = outline->tags; - AF_Point end = points + outline->contours[0]; + FT_Short endpoint = outline->contours[0]; + AF_Point end = points + endpoint; AF_Point prev = end; FT_Int contour_index = 0; for ( point = points; point < point_limit; point++, vec++, tag++ ) { + FT_Pos out_x, out_y; + + point->in_dir = (FT_Char)AF_DIR_NONE; point->out_dir = (FT_Char)AF_DIR_NONE; @@ -822,6 +851,9 @@ point->ox = point->x = FT_MulFix( vec->x, x_scale ) + x_delta; point->oy = point->y = FT_MulFix( vec->y, y_scale ) + y_delta; + end->fx = (FT_Short)outline->points[endpoint].x; + end->fy = (FT_Short)outline->points[endpoint].y; + switch ( FT_CURVE_TAG( *tag ) ) { case FT_CURVE_TAG_CONIC: @@ -834,6 +866,12 @@ point->flags = AF_FLAG_NONE; } + out_x = point->fx - prev->fx; + out_y = point->fy - prev->fy; + + if ( FT_ABS( out_x ) + FT_ABS( out_y ) < near_limit ) + prev->flags |= AF_FLAG_NEAR; + point->prev = prev; prev->next = point; prev = point; @@ -842,8 +880,9 @@ { if ( ++contour_index < outline->n_contours ) { - end = points + outline->contours[contour_index]; - prev = end; + endpoint = outline->contours[contour_index]; + end = points + endpoint; + prev = end; } } } @@ -869,17 +908,15 @@ * Compute directions of `in' and `out' vectors. * * Note that distances between points that are very near to each - * other are accumulated. In other words, the auto-hinter + * other are accumulated. In other words, the auto-hinter either * prepends the small vectors between near points to the first - * non-near vector. All intermediate points are tagged as - * weak; the directions are adjusted also to be equal to the - * accumulated one. + * non-near vector, or the sum of small vector lengths exceeds a + * threshold, thus `grouping' the small vectors. All intermediate + * points are tagged as weak; the directions are adjusted also to + * be equal to the accumulated one. */ - /* value 20 in `near_limit' is heuristic */ - FT_UInt units_per_em = hints->metrics->scaler.face->units_per_EM; - FT_Int near_limit = 20 * units_per_em / 2048; - FT_Int near_limit2 = 2 * near_limit - 1; + FT_Int near_limit2 = 2 * near_limit - 1; AF_Point* contour; AF_Point* contour_limit = hints->contours + hints->num_contours; @@ -926,7 +963,7 @@ /* now loop over all points of the contour to get */ /* `in' and `out' vector directions */ - curr = first; + curr = first; /* * We abuse the `u' and `v' fields to store index deltas to the @@ -949,7 +986,7 @@ point = next; - next = point->next; + next = point->next; out_x += next->fx - point->fx; out_y += next->fy - point->fy; |