summaryrefslogtreecommitdiffstats
path: root/src/autofit/aflatin.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/autofit/aflatin.c')
-rw-r--r--src/autofit/aflatin.c1038
1 files changed, 649 insertions, 389 deletions
diff --git a/src/autofit/aflatin.c b/src/autofit/aflatin.c
index 893e986..9c9f370 100644
--- a/src/autofit/aflatin.c
+++ b/src/autofit/aflatin.c
@@ -41,6 +41,10 @@
#define FT_COMPONENT trace_aflatin
+ /* needed for computation of round vs. flat segments */
+#define FLAT_THRESHOLD( x ) ( x / 14 )
+
+
/*************************************************************************/
/*************************************************************************/
/***** *****/
@@ -75,7 +79,6 @@
{
FT_Error error;
FT_ULong glyph_index;
- FT_Long y_offset;
int dim;
AF_LatinMetricsRec dummy[1];
AF_Scaler scaler = &dummy->root.scaler;
@@ -88,52 +91,63 @@
AF_ScriptClass script_class = AF_SCRIPT_CLASSES_GET
[style_class->script];
- FT_UInt32 standard_char;
+ void* shaper_buf;
+ const char* p;
+
+#ifdef FT_DEBUG_LEVEL_TRACE
+ FT_ULong ch;
+#endif
+ p = script_class->standard_charstring;
+ shaper_buf = af_shaper_buf_create( face );
/*
- * We check more than a single standard character to catch features
- * like `c2sc' (small caps from caps) that don't contain lowercase
- * letters by definition, or other features that mainly operate on
- * numerals.
+ * We check a list of standard characters to catch features like
+ * `c2sc' (small caps from caps) that don't contain lowercase letters
+ * by definition, or other features that mainly operate on numerals.
+ * The first match wins.
*/
- standard_char = script_class->standard_char1;
- af_get_char_index( &metrics->root,
- standard_char,
- &glyph_index,
- &y_offset );
- if ( !glyph_index )
+ glyph_index = 0;
+ while ( *p )
{
- if ( script_class->standard_char2 )
- {
- standard_char = script_class->standard_char2;
- af_get_char_index( &metrics->root,
- standard_char,
- &glyph_index,
- &y_offset );
- if ( !glyph_index )
- {
- if ( script_class->standard_char3 )
- {
- standard_char = script_class->standard_char3;
- af_get_char_index( &metrics->root,
- standard_char,
- &glyph_index,
- &y_offset );
- if ( !glyph_index )
- goto Exit;
- }
- else
- goto Exit;
- }
- }
- else
- goto Exit;
+ unsigned int num_idx;
+
+#ifdef FT_DEBUG_LEVEL_TRACE
+ const char* p_old;
+#endif
+
+
+ while ( *p == ' ' )
+ p++;
+
+#ifdef FT_DEBUG_LEVEL_TRACE
+ p_old = p;
+ GET_UTF8_CHAR( ch, p_old );
+#endif
+
+ /* reject input that maps to more than a single glyph */
+ p = af_shaper_get_cluster( p, &metrics->root, shaper_buf, &num_idx );
+ if ( num_idx > 1 )
+ continue;
+
+ /* otherwise exit loop if we have a result */
+ glyph_index = af_shaper_get_elem( &metrics->root,
+ shaper_buf,
+ 0,
+ NULL,
+ NULL );
+ if ( glyph_index )
+ break;
}
+ af_shaper_buf_destroy( face, shaper_buf );
+
+ if ( !glyph_index )
+ goto Exit;
+
FT_TRACE5(( "standard character: U+%04lX (glyph index %d)\n",
- standard_char, glyph_index ));
+ ch, glyph_index ));
error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
if ( error || face->glyph->outline.n_points <= 0 )
@@ -274,6 +288,10 @@
AF_Blue_Stringset bss = sc->blue_stringset;
const AF_Blue_StringRec* bs = &af_blue_stringsets[bss];
+ FT_Pos flat_threshold = FLAT_THRESHOLD( metrics->units_per_em );
+
+ void* shaper_buf;
+
/* we walk over the blue character strings as specified in the */
/* style's entry in the `af_blue_stringset' array */
@@ -282,11 +300,15 @@
"============================\n"
"\n" ));
+ shaper_buf = af_shaper_buf_create( face );
+
for ( ; bs->string != AF_BLUE_STRING_MAX; bs++ )
{
const char* p = &af_blue_strings[bs->string];
FT_Pos* blue_ref;
FT_Pos* blue_shoot;
+ FT_Pos ascender;
+ FT_Pos descender;
#ifdef FT_DEBUG_LEVEL_TRACE
@@ -305,6 +327,11 @@
FT_TRACE5(( "top" ));
have_flag = 1;
}
+ else if ( AF_LATIN_IS_SUB_TOP_BLUE( bs ) )
+ {
+ FT_TRACE5(( "sub top" ));
+ have_flag = 1;
+ }
if ( AF_LATIN_IS_NEUTRAL_BLUE( bs ) )
{
@@ -338,394 +365,482 @@
num_flats = 0;
num_rounds = 0;
+ ascender = 0;
+ descender = 0;
while ( *p )
{
- FT_ULong ch;
FT_ULong glyph_index;
FT_Long y_offset;
- FT_Pos best_y; /* same as points.y */
FT_Int best_point, best_contour_first, best_contour_last;
FT_Vector* points;
- FT_Bool round = 0;
+ FT_Pos best_y_extremum; /* same as points.y */
+ FT_Bool best_round = 0;
- GET_UTF8_CHAR( ch, p );
+ unsigned int i, num_idx;
- /* load the character in the face -- skip unknown or empty ones */
- af_get_char_index( &metrics->root, ch, &glyph_index, &y_offset );
- if ( glyph_index == 0 )
- {
- FT_TRACE5(( " U+%04lX unavailable\n", ch ));
- continue;
- }
+#ifdef FT_DEBUG_LEVEL_TRACE
+ const char* p_old;
+ FT_ULong ch;
+#endif
+
+
+ while ( *p == ' ' )
+ p++;
+
+#ifdef FT_DEBUG_LEVEL_TRACE
+ p_old = p;
+ GET_UTF8_CHAR( ch, p_old );
+#endif
- error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
- outline = face->glyph->outline;
- /* reject glyphs that don't produce any rendering */
- if ( error || outline.n_points <= 2 )
+ p = af_shaper_get_cluster( p, &metrics->root, shaper_buf, &num_idx );
+
+ if ( !num_idx )
{
- FT_TRACE5(( " U+%04lX contains no (usable) outlines\n", ch ));
+ FT_TRACE5(( " U+%04lX unavailable\n", ch ));
continue;
}
- /* now compute min or max point indices and coordinates */
- points = outline.points;
- best_point = -1;
- best_y = 0; /* make compiler happy */
- best_contour_first = 0; /* ditto */
- best_contour_last = 0; /* ditto */
+ if ( AF_LATIN_IS_TOP_BLUE( bs ) )
+ best_y_extremum = FT_INT_MIN;
+ else
+ best_y_extremum = FT_INT_MAX;
+ /* iterate over all glyph elements of the character cluster */
+ /* and get the data of the `biggest' one */
+ for ( i = 0; i < num_idx; i++ )
{
- FT_Int nn;
- FT_Int first = 0;
- FT_Int last = -1;
+ FT_Pos best_y;
+ FT_Bool round = 0;
- for ( nn = 0; nn < outline.n_contours; first = last + 1, nn++ )
+ /* load the character in the face -- skip unknown or empty ones */
+ glyph_index = af_shaper_get_elem( &metrics->root,
+ shaper_buf,
+ i,
+ NULL,
+ &y_offset );
+ if ( glyph_index == 0 )
{
- FT_Int old_best_point = best_point;
- FT_Int pp;
+ FT_TRACE5(( " U+%04lX unavailable\n", ch ));
+ continue;
+ }
+ error = FT_Load_Glyph( face, glyph_index, FT_LOAD_NO_SCALE );
+ outline = face->glyph->outline;
+ /* reject glyphs that don't produce any rendering */
+ if ( error || outline.n_points <= 2 )
+ {
+#ifdef FT_DEBUG_LEVEL_TRACE
+ if ( num_idx == 1 )
+ FT_TRACE5(( " U+%04lX contains no (usable) outlines\n", ch ));
+ else
+ FT_TRACE5(( " component %d of cluster starting with U+%04lX"
+ " contains no (usable) outlines\n", i, ch ));
+#endif
+ continue;
+ }
- last = outline.contours[nn];
+ /* now compute min or max point indices and coordinates */
+ points = outline.points;
+ best_point = -1;
+ best_y = 0; /* make compiler happy */
+ best_contour_first = 0; /* ditto */
+ best_contour_last = 0; /* ditto */
- /* Avoid single-point contours since they are never rasterized. */
- /* In some fonts, they correspond to mark attachment points */
- /* that are way outside of the glyph's real outline. */
- if ( last <= first )
- continue;
+ {
+ FT_Int nn;
+ FT_Int first = 0;
+ FT_Int last = -1;
- if ( AF_LATIN_IS_TOP_BLUE( bs ) )
+
+ for ( nn = 0; nn < outline.n_contours; first = last + 1, nn++ )
{
- for ( pp = first; pp <= last; pp++ )
- if ( best_point < 0 || points[pp].y > best_y )
+ FT_Int old_best_point = best_point;
+ FT_Int pp;
+
+
+ last = outline.contours[nn];
+
+ /* Avoid single-point contours since they are never */
+ /* rasterized. In some fonts, they correspond to mark */
+ /* attachment points that are way outside of the glyph's */
+ /* real outline. */
+ if ( last <= first )
+ continue;
+
+ if ( AF_LATIN_IS_TOP_BLUE( bs ) ||
+ AF_LATIN_IS_SUB_TOP_BLUE( bs ) )
+ {
+ for ( pp = first; pp <= last; pp++ )
{
- best_point = pp;
- best_y = points[pp].y;
+ if ( best_point < 0 || points[pp].y > best_y )
+ {
+ best_point = pp;
+ best_y = points[pp].y;
+ ascender = FT_MAX( ascender, best_y + y_offset );
+ }
+ else
+ descender = FT_MIN( descender, points[pp].y + y_offset );
}
- }
- else
- {
- for ( pp = first; pp <= last; pp++ )
- if ( best_point < 0 || points[pp].y < best_y )
+ }
+ else
+ {
+ for ( pp = first; pp <= last; pp++ )
{
- best_point = pp;
- best_y = points[pp].y;
+ if ( best_point < 0 || points[pp].y < best_y )
+ {
+ best_point = pp;
+ best_y = points[pp].y;
+ descender = FT_MIN( descender, best_y + y_offset );
+ }
+ else
+ ascender = FT_MAX( ascender, points[pp].y + y_offset );
}
- }
+ }
- if ( best_point != old_best_point )
- {
- best_contour_first = first;
- best_contour_last = last;
+ if ( best_point != old_best_point )
+ {
+ best_contour_first = first;
+ best_contour_last = last;
+ }
}
}
- }
-
- /* now check whether the point belongs to a straight or round */
- /* segment; we first need to find in which contour the extremum */
- /* lies, then inspect its previous and next points */
- if ( best_point >= 0 )
- {
- FT_Pos best_x = points[best_point].x;
- FT_Int prev, next;
- FT_Int best_segment_first, best_segment_last;
- FT_Int best_on_point_first, best_on_point_last;
- FT_Pos dist;
-
- best_segment_first = best_point;
- best_segment_last = best_point;
-
- if ( FT_CURVE_TAG( outline.tags[best_point] ) == FT_CURVE_TAG_ON )
+ /* now check whether the point belongs to a straight or round */
+ /* segment; we first need to find in which contour the extremum */
+ /* lies, then inspect its previous and next points */
+ if ( best_point >= 0 )
{
- best_on_point_first = best_point;
- best_on_point_last = best_point;
- }
- else
- {
- best_on_point_first = -1;
- best_on_point_last = -1;
- }
+ FT_Pos best_x = points[best_point].x;
+ FT_Int prev, next;
+ FT_Int best_segment_first, best_segment_last;
+ FT_Int best_on_point_first, best_on_point_last;
+ FT_Pos dist;
- /* look for the previous and next points on the contour */
- /* that are not on the same Y coordinate, then threshold */
- /* the `closeness'... */
- prev = best_point;
- next = prev;
- do
- {
- if ( prev > best_contour_first )
- prev--;
- else
- prev = best_contour_last;
+ best_segment_first = best_point;
+ best_segment_last = best_point;
- dist = FT_ABS( points[prev].y - best_y );
- /* accept a small distance or a small angle (both values are */
- /* heuristic; value 20 corresponds to approx. 2.9 degrees) */
- if ( dist > 5 )
- if ( FT_ABS( points[prev].x - best_x ) <= 20 * dist )
- break;
+ if ( FT_CURVE_TAG( outline.tags[best_point] ) == FT_CURVE_TAG_ON )
+ {
+ best_on_point_first = best_point;
+ best_on_point_last = best_point;
+ }
+ else
+ {
+ best_on_point_first = -1;
+ best_on_point_last = -1;
+ }
- best_segment_first = prev;
+ /* look for the previous and next points on the contour */
+ /* that are not on the same Y coordinate, then threshold */
+ /* the `closeness'... */
+ prev = best_point;
+ next = prev;
- if ( FT_CURVE_TAG( outline.tags[prev] ) == FT_CURVE_TAG_ON )
+ do
{
- best_on_point_first = prev;
- if ( best_on_point_last < 0 )
- best_on_point_last = prev;
- }
+ if ( prev > best_contour_first )
+ prev--;
+ else
+ prev = best_contour_last;
- } while ( prev != best_point );
+ dist = FT_ABS( points[prev].y - best_y );
+ /* accept a small distance or a small angle (both values are */
+ /* heuristic; value 20 corresponds to approx. 2.9 degrees) */
+ if ( dist > 5 )
+ if ( FT_ABS( points[prev].x - best_x ) <= 20 * dist )
+ break;
- do
- {
- if ( next < best_contour_last )
- next++;
- else
- next = best_contour_first;
+ best_segment_first = prev;
- dist = FT_ABS( points[next].y - best_y );
- if ( dist > 5 )
- if ( FT_ABS( points[next].x - best_x ) <= 20 * dist )
- break;
+ if ( FT_CURVE_TAG( outline.tags[prev] ) == FT_CURVE_TAG_ON )
+ {
+ best_on_point_first = prev;
+ if ( best_on_point_last < 0 )
+ best_on_point_last = prev;
+ }
- best_segment_last = next;
+ } while ( prev != best_point );
- if ( FT_CURVE_TAG( outline.tags[next] ) == FT_CURVE_TAG_ON )
+ do
{
- best_on_point_last = next;
- if ( best_on_point_first < 0 )
- best_on_point_first = next;
- }
+ if ( next < best_contour_last )
+ next++;
+ else
+ next = best_contour_first;
- } while ( next != best_point );
+ dist = FT_ABS( points[next].y - best_y );
+ if ( dist > 5 )
+ if ( FT_ABS( points[next].x - best_x ) <= 20 * dist )
+ break;
- if ( AF_LATIN_IS_LONG_BLUE( bs ) )
- {
- /* If this flag is set, we have an additional constraint to */
- /* get the blue zone distance: Find a segment of the topmost */
- /* (or bottommost) contour that is longer than a heuristic */
- /* threshold. This ensures that small bumps in the outline */
- /* are ignored (for example, the `vertical serifs' found in */
- /* many Hebrew glyph designs). */
-
- /* If this segment is long enough, we are done. Otherwise, */
- /* search the segment next to the extremum that is long */
- /* enough, has the same direction, and a not too large */
- /* vertical distance from the extremum. Note that the */
- /* algorithm doesn't check whether the found segment is */
- /* actually the one (vertically) nearest to the extremum. */
-
- /* heuristic threshold value */
- FT_Pos length_threshold = metrics->units_per_em / 25;
-
-
- dist = FT_ABS( points[best_segment_last].x -
- points[best_segment_first].x );
-
- if ( dist < length_threshold &&
- best_segment_last - best_segment_first + 2 <=
- best_contour_last - best_contour_first )
+ best_segment_last = next;
+
+ if ( FT_CURVE_TAG( outline.tags[next] ) == FT_CURVE_TAG_ON )
+ {
+ best_on_point_last = next;
+ if ( best_on_point_first < 0 )
+ best_on_point_first = next;
+ }
+
+ } while ( next != best_point );
+
+ if ( AF_LATIN_IS_LONG_BLUE( bs ) )
{
+ /* If this flag is set, we have an additional constraint to */
+ /* get the blue zone distance: Find a segment of the topmost */
+ /* (or bottommost) contour that is longer than a heuristic */
+ /* threshold. This ensures that small bumps in the outline */
+ /* are ignored (for example, the `vertical serifs' found in */
+ /* many Hebrew glyph designs). */
+
+ /* If this segment is long enough, we are done. Otherwise, */
+ /* search the segment next to the extremum that is long */
+ /* enough, has the same direction, and a not too large */
+ /* vertical distance from the extremum. Note that the */
+ /* algorithm doesn't check whether the found segment is */
+ /* actually the one (vertically) nearest to the extremum. */
+
/* heuristic threshold value */
- FT_Pos height_threshold = metrics->units_per_em / 4;
+ FT_Pos length_threshold = metrics->units_per_em / 25;
- FT_Int first;
- FT_Int last;
- FT_Bool hit;
- /* we intentionally declare these two variables */
- /* outside of the loop since various compilers emit */
- /* incorrect warning messages otherwise, talking about */
- /* `possibly uninitialized variables' */
- FT_Int p_first = 0; /* make compiler happy */
- FT_Int p_last = 0;
+ dist = FT_ABS( points[best_segment_last].x -
+ points[best_segment_first].x );
- FT_Bool left2right;
+ if ( dist < length_threshold &&
+ best_segment_last - best_segment_first + 2 <=
+ best_contour_last - best_contour_first )
+ {
+ /* heuristic threshold value */
+ FT_Pos height_threshold = metrics->units_per_em / 4;
+ FT_Int first;
+ FT_Int last;
+ FT_Bool hit;
- /* compute direction */
- prev = best_point;
+ /* we intentionally declare these two variables */
+ /* outside of the loop since various compilers emit */
+ /* incorrect warning messages otherwise, talking about */
+ /* `possibly uninitialized variables' */
+ FT_Int p_first = 0; /* make compiler happy */
+ FT_Int p_last = 0;
- do
- {
- if ( prev > best_contour_first )
- prev--;
- else
- prev = best_contour_last;
+ FT_Bool left2right;
- if ( points[prev].x != best_x )
- break;
- } while ( prev != best_point );
+ /* compute direction */
+ prev = best_point;
- /* skip glyph for the degenerate case */
- if ( prev == best_point )
- continue;
+ do
+ {
+ if ( prev > best_contour_first )
+ prev--;
+ else
+ prev = best_contour_last;
- left2right = FT_BOOL( points[prev].x < points[best_point].x );
+ if ( points[prev].x != best_x )
+ break;
- first = best_segment_last;
- last = first;
- hit = 0;
+ } while ( prev != best_point );
- do
- {
- FT_Bool l2r;
- FT_Pos d;
+ /* skip glyph for the degenerate case */
+ if ( prev == best_point )
+ continue;
+ left2right = FT_BOOL( points[prev].x < points[best_point].x );
- if ( !hit )
+ first = best_segment_last;
+ last = first;
+ hit = 0;
+
+ do
{
- /* no hit; adjust first point */
- first = last;
+ FT_Bool l2r;
+ FT_Pos d;
- /* also adjust first and last on point */
- if ( FT_CURVE_TAG( outline.tags[first] ) ==
- FT_CURVE_TAG_ON )
- {
- p_first = first;
- p_last = first;
- }
- else
+
+ if ( !hit )
{
- p_first = -1;
- p_last = -1;
- }
+ /* no hit; adjust first point */
+ first = last;
- hit = 1;
- }
+ /* also adjust first and last on point */
+ if ( FT_CURVE_TAG( outline.tags[first] ) ==
+ FT_CURVE_TAG_ON )
+ {
+ p_first = first;
+ p_last = first;
+ }
+ else
+ {
+ p_first = -1;
+ p_last = -1;
+ }
- if ( last < best_contour_last )
- last++;
- else
- last = best_contour_first;
+ hit = 1;
+ }
- if ( FT_ABS( best_y - points[first].y ) > height_threshold )
- {
- /* vertical distance too large */
- hit = 0;
- continue;
- }
+ if ( last < best_contour_last )
+ last++;
+ else
+ last = best_contour_first;
- /* same test as above */
- dist = FT_ABS( points[last].y - points[first].y );
- if ( dist > 5 )
- if ( FT_ABS( points[last].x - points[first].x ) <=
- 20 * dist )
+ if ( FT_ABS( best_y - points[first].y ) > height_threshold )
{
+ /* vertical distance too large */
hit = 0;
continue;
}
- if ( FT_CURVE_TAG( outline.tags[last] ) == FT_CURVE_TAG_ON )
- {
- p_last = last;
- if ( p_first < 0 )
- p_first = last;
- }
+ /* same test as above */
+ dist = FT_ABS( points[last].y - points[first].y );
+ if ( dist > 5 )
+ if ( FT_ABS( points[last].x - points[first].x ) <=
+ 20 * dist )
+ {
+ hit = 0;
+ continue;
+ }
- l2r = FT_BOOL( points[first].x < points[last].x );
- d = FT_ABS( points[last].x - points[first].x );
+ if ( FT_CURVE_TAG( outline.tags[last] ) == FT_CURVE_TAG_ON )
+ {
+ p_last = last;
+ if ( p_first < 0 )
+ p_first = last;
+ }
- if ( l2r == left2right &&
- d >= length_threshold )
- {
- /* all constraints are met; update segment after finding */
- /* its end */
- do
+ l2r = FT_BOOL( points[first].x < points[last].x );
+ d = FT_ABS( points[last].x - points[first].x );
+
+ if ( l2r == left2right &&
+ d >= length_threshold )
{
- if ( last < best_contour_last )
- last++;
- else
- last = best_contour_first;
+ /* all constraints are met; update segment after */
+ /* finding its end */
+ do
+ {
+ if ( last < best_contour_last )
+ last++;
+ else
+ last = best_contour_first;
+
+ d = FT_ABS( points[last].y - points[first].y );
+ if ( d > 5 )
+ if ( FT_ABS( points[next].x - points[first].x ) <=
+ 20 * dist )
+ {
+ if ( last > best_contour_first )
+ last--;
+ else
+ last = best_contour_last;
+ break;
+ }
- d = FT_ABS( points[last].y - points[first].y );
- if ( d > 5 )
- if ( FT_ABS( points[next].x - points[first].x ) <=
- 20 * dist )
+ p_last = last;
+
+ if ( FT_CURVE_TAG( outline.tags[last] ) ==
+ FT_CURVE_TAG_ON )
{
- if ( last > best_contour_first )
- last--;
- else
- last = best_contour_last;
- break;
+ p_last = last;
+ if ( p_first < 0 )
+ p_first = last;
}
- p_last = last;
+ } while ( last != best_segment_first );
- if ( FT_CURVE_TAG( outline.tags[last] ) ==
- FT_CURVE_TAG_ON )
- {
- p_last = last;
- if ( p_first < 0 )
- p_first = last;
- }
+ best_y = points[first].y;
+
+ best_segment_first = first;
+ best_segment_last = last;
+
+ best_on_point_first = p_first;
+ best_on_point_last = p_last;
- } while ( last != best_segment_first );
+ break;
+ }
- best_y = points[first].y;
+ } while ( last != best_segment_first );
+ }
+ }
- best_segment_first = first;
- best_segment_last = last;
+ /* for computing blue zones, we add the y offset as returned */
+ /* by the currently used OpenType feature -- for example, */
+ /* superscript glyphs might be identical to subscript glyphs */
+ /* with a vertical shift */
+ best_y += y_offset;
- best_on_point_first = p_first;
- best_on_point_last = p_last;
+#ifdef FT_DEBUG_LEVEL_TRACE
+ if ( num_idx == 1 )
+ FT_TRACE5(( " U+%04lX: best_y = %5ld", ch, best_y ));
+ else
+ FT_TRACE5(( " component %d of cluster starting with U+%04lX:"
+ " best_y = %5ld", i, ch, best_y ));
+#endif
- break;
- }
+ /* now set the `round' flag depending on the segment's kind: */
+ /* */
+ /* - if the horizontal distance between the first and last */
+ /* `on' point is larger than a heuristic threshold */
+ /* we have a flat segment */
+ /* - if either the first or the last point of the segment is */
+ /* an `off' point, the segment is round, otherwise it is */
+ /* flat */
+ if ( best_on_point_first >= 0 &&
+ best_on_point_last >= 0 &&
+ ( FT_ABS( points[best_on_point_last].x -
+ points[best_on_point_first].x ) ) >
+ flat_threshold )
+ round = 0;
+ else
+ round = FT_BOOL(
+ FT_CURVE_TAG( outline.tags[best_segment_first] ) !=
+ FT_CURVE_TAG_ON ||
+ FT_CURVE_TAG( outline.tags[best_segment_last] ) !=
+ FT_CURVE_TAG_ON );
- } while ( last != best_segment_first );
+ if ( round && AF_LATIN_IS_NEUTRAL_BLUE( bs ) )
+ {
+ /* only use flat segments for a neutral blue zone */
+ FT_TRACE5(( " (round, skipped)\n" ));
+ continue;
}
+
+ FT_TRACE5(( " (%s)\n", round ? "round" : "flat" ));
}
- /* for computing blue zones, we add the y offset as returned */
- /* by the currently used OpenType feature -- for example, */
- /* superscript glyphs might be identical to subscript glyphs */
- /* with a vertical shift */
- best_y += y_offset;
-
- FT_TRACE5(( " U+%04lX: best_y = %5ld", ch, best_y ));
-
- /* now set the `round' flag depending on the segment's kind: */
- /* */
- /* - if the horizontal distance between the first and last */
- /* `on' point is larger than upem/8 (value 8 is heuristic) */
- /* we have a flat segment */
- /* - if either the first or the last point of the segment is */
- /* an `off' point, the segment is round, otherwise it is */
- /* flat */
- if ( best_on_point_first >= 0 &&
- best_on_point_last >= 0 &&
- (FT_UInt)( FT_ABS( points[best_on_point_last].x -
- points[best_on_point_first].x ) ) >
- metrics->units_per_em / 8 )
- round = 0;
+ if ( AF_LATIN_IS_TOP_BLUE( bs ) )
+ {
+ if ( best_y > best_y_extremum )
+ {
+ best_y_extremum = best_y;
+ best_round = round;
+ }
+ }
else
- round = FT_BOOL(
- FT_CURVE_TAG( outline.tags[best_segment_first] ) !=
- FT_CURVE_TAG_ON ||
- FT_CURVE_TAG( outline.tags[best_segment_last] ) !=
- FT_CURVE_TAG_ON );
-
- if ( round && AF_LATIN_IS_NEUTRAL_BLUE( bs ) )
{
- /* only use flat segments for a neutral blue zone */
- FT_TRACE5(( " (round, skipped)\n" ));
- continue;
+ if ( best_y < best_y_extremum )
+ {
+ best_y_extremum = best_y;
+ best_round = round;
+ }
}
- FT_TRACE5(( " (%s)\n", round ? "round" : "flat" ));
+ } /* end for loop */
+
+ if ( !( best_y_extremum == FT_INT_MIN ||
+ best_y_extremum == FT_INT_MAX ) )
+ {
+ if ( best_round )
+ rounds[num_rounds++] = best_y_extremum;
+ else
+ flats[num_flats++] = best_y_extremum;
}
- if ( round )
- rounds[num_rounds++] = best_y;
- else
- flats[num_flats++] = best_y;
- }
+ } /* end while loop */
if ( num_flats == 0 && num_rounds == 0 )
{
@@ -775,7 +890,8 @@
FT_Bool over_ref = FT_BOOL( shoot > ref );
- if ( AF_LATIN_IS_TOP_BLUE( bs ) ^ over_ref )
+ if ( ( AF_LATIN_IS_TOP_BLUE( bs ) ||
+ AF_LATIN_IS_SUB_TOP_BLUE( bs) ) ^ over_ref )
{
*blue_ref =
*blue_shoot = ( shoot + ref ) / 2;
@@ -785,9 +901,14 @@
}
}
+ blue->ascender = ascender;
+ blue->descender = descender;
+
blue->flags = 0;
if ( AF_LATIN_IS_TOP_BLUE( bs ) )
blue->flags |= AF_LATIN_BLUE_TOP;
+ if ( AF_LATIN_IS_SUB_TOP_BLUE( bs ) )
+ blue->flags |= AF_LATIN_BLUE_SUB_TOP;
if ( AF_LATIN_IS_NEUTRAL_BLUE( bs ) )
blue->flags |= AF_LATIN_BLUE_NEUTRAL;
@@ -802,7 +923,10 @@
FT_TRACE5(( " -> reference = %ld\n"
" overshoot = %ld\n",
*blue_ref, *blue_shoot ));
- }
+
+ } /* end for loop */
+
+ af_shaper_buf_destroy( face, shaper_buf );
FT_TRACE5(( "\n" ));
@@ -816,27 +940,36 @@
af_latin_metrics_check_digits( AF_LatinMetrics metrics,
FT_Face face )
{
- FT_UInt i;
FT_Bool started = 0, same_width = 1;
FT_Fixed advance, old_advance = 0;
+ void* shaper_buf;
- /* digit `0' is 0x30 in all supported charmaps */
- for ( i = 0x30; i <= 0x39; i++ )
+ /* in all supported charmaps, digits have character codes 0x30-0x39 */
+ const char digits[] = "0 1 2 3 4 5 6 7 8 9";
+ const char* p;
+
+
+ p = digits;
+ shaper_buf = af_shaper_buf_create( face );
+
+ while ( *p )
{
- FT_ULong glyph_index;
- FT_Long y_offset;
+ FT_ULong glyph_index;
+ unsigned int num_idx;
- af_get_char_index( &metrics->root, i, &glyph_index, &y_offset );
- if ( glyph_index == 0 )
+ /* reject input that maps to more than a single glyph */
+ p = af_shaper_get_cluster( p, &metrics->root, shaper_buf, &num_idx );
+ if ( num_idx > 1 )
continue;
- if ( FT_Get_Advance( face, glyph_index,
- FT_LOAD_NO_SCALE |
- FT_LOAD_NO_HINTING |
- FT_LOAD_IGNORE_TRANSFORM,
- &advance ) )
+ glyph_index = af_shaper_get_elem( &metrics->root,
+ shaper_buf,
+ 0,
+ &advance,
+ NULL );
+ if ( !glyph_index )
continue;
if ( started )
@@ -854,6 +987,8 @@
}
}
+ af_shaper_buf_destroy( face, shaper_buf );
+
metrics->root.digits_have_same_width = same_width;
}
@@ -967,18 +1102,52 @@
#endif
if ( dim == AF_DIMENSION_VERT )
{
- scale = FT_MulDiv( scale, fitted, scaled );
-
- FT_TRACE5((
- "af_latin_metrics_scale_dim:"
- " x height alignment (style `%s'):\n"
- " "
- " vertical scaling changed from %.4f to %.4f (by %d%%)\n"
- "\n",
- af_style_names[metrics->root.style_class->style],
- axis->org_scale / 65536.0,
- scale / 65536.0,
- ( fitted - scaled ) * 100 / scaled ));
+ FT_Pos max_height;
+ FT_Pos dist;
+ FT_Fixed new_scale;
+
+
+ new_scale = FT_MulDiv( scale, fitted, scaled );
+
+ /* the scaling should not change the result by more than two pixels */
+ max_height = metrics->units_per_em;
+
+ for ( nn = 0; nn < Axis->blue_count; nn++ )
+ {
+ max_height = FT_MAX( max_height, Axis->blues[nn].ascender );
+ max_height = FT_MAX( max_height, -Axis->blues[nn].descender );
+ }
+
+ dist = FT_ABS( FT_MulFix( max_height, new_scale - scale ) );
+ dist &= ~127;
+
+ if ( dist == 0 )
+ {
+ scale = new_scale;
+
+ FT_TRACE5((
+ "af_latin_metrics_scale_dim:"
+ " x height alignment (style `%s'):\n"
+ " "
+ " vertical scaling changed from %.4f to %.4f (by %d%%)\n"
+ "\n",
+ af_style_names[metrics->root.style_class->style],
+ axis->org_scale / 65536.0,
+ scale / 65536.0,
+ ( fitted - scaled ) * 100 / scaled ));
+ }
+#ifdef FT_DEBUG_LEVEL_TRACE
+ else
+ {
+ FT_TRACE5((
+ "af_latin_metrics_scale_dim:"
+ " x height alignment (style `%s'):\n"
+ " "
+ " excessive vertical scaling abandoned\n"
+ "\n",
+ af_style_names[metrics->root.style_class->style] ));
+ }
+#endif
}
}
}
@@ -1032,8 +1201,11 @@
if ( dim == AF_DIMENSION_VERT )
{
- FT_TRACE5(( "blue zones (style `%s')\n",
- af_style_names[metrics->root.style_class->style] ));
+#ifdef FT_DEBUG_LEVEL_TRACE
+ if ( axis->blue_count )
+ FT_TRACE5(( "blue zones (style `%s')\n",
+ af_style_names[metrics->root.style_class->style] ));
+#endif
/* scale the blue zones */
for ( nn = 0; nn < axis->blue_count; nn++ )
@@ -1106,21 +1278,63 @@
#endif
blue->flags |= AF_LATIN_BLUE_ACTIVE;
+ }
+ }
+
+ /* use sub-top blue zone only if it doesn't overlap with */
+ /* another (non-sup-top) blue zone; otherwise, the */
+ /* effect would be similar to a neutral blue zone, which */
+ /* is not desired here */
+ for ( nn = 0; nn < axis->blue_count; nn++ )
+ {
+ AF_LatinBlue blue = &axis->blues[nn];
+ FT_UInt i;
+
+
+ if ( !( blue->flags & AF_LATIN_BLUE_SUB_TOP ) )
+ continue;
+ if ( !( blue->flags & AF_LATIN_BLUE_ACTIVE ) )
+ continue;
- FT_TRACE5(( " reference %d: %d scaled to %.2f%s\n"
- " overshoot %d: %d scaled to %.2f%s\n",
- nn,
- blue->ref.org,
- blue->ref.fit / 64.0,
- blue->flags & AF_LATIN_BLUE_ACTIVE ? ""
- : " (inactive)",
- nn,
- blue->shoot.org,
- blue->shoot.fit / 64.0,
- blue->flags & AF_LATIN_BLUE_ACTIVE ? ""
- : " (inactive)" ));
+ for ( i = 0; i < axis->blue_count; i++ )
+ {
+ AF_LatinBlue b = &axis->blues[i];
+
+
+ if ( b->flags & AF_LATIN_BLUE_SUB_TOP )
+ continue;
+ if ( !( b->flags & AF_LATIN_BLUE_ACTIVE ) )
+ continue;
+
+ if ( b->ref.fit <= blue->shoot.fit &&
+ b->shoot.fit >= blue->ref.fit )
+ {
+ blue->flags &= ~AF_LATIN_BLUE_ACTIVE;
+ break;
+ }
}
}
+
+#ifdef FT_DEBUG_LEVEL_TRACE
+ for ( nn = 0; nn < axis->blue_count; nn++ )
+ {
+ AF_LatinBlue blue = &axis->blues[nn];
+
+
+ FT_TRACE5(( " reference %d: %d scaled to %.2f%s\n"
+ " overshoot %d: %d scaled to %.2f%s\n",
+ nn,
+ blue->ref.org,
+ blue->ref.fit / 64.0,
+ blue->flags & AF_LATIN_BLUE_ACTIVE ? ""
+ : " (inactive)",
+ nn,
+ blue->shoot.org,
+ blue->shoot.fit / 64.0,
+ blue->flags & AF_LATIN_BLUE_ACTIVE ? ""
+ : " (inactive)" ));
+ }
+#endif
}
}
@@ -1140,6 +1354,22 @@
}
+ /* Extract standard_width from writing system/script specific */
+ /* metrics class. */
+
+ FT_LOCAL_DEF( void )
+ af_latin_get_standard_widths( AF_LatinMetrics metrics,
+ FT_Pos* stdHW,
+ FT_Pos* stdVW )
+ {
+ if ( stdHW )
+ *stdHW = metrics->axis[AF_DIMENSION_VERT].standard_width;
+
+ if ( stdVW )
+ *stdVW = metrics->axis[AF_DIMENSION_HORZ].standard_width;
+ }
+
+
/*************************************************************************/
/*************************************************************************/
/***** *****/
@@ -1155,14 +1385,17 @@
af_latin_hints_compute_segments( AF_GlyphHints hints,
AF_Dimension dim )
{
- AF_AxisHints axis = &hints->axis[dim];
- FT_Memory memory = hints->memory;
- FT_Error error = FT_Err_Ok;
- AF_Segment segment = NULL;
- AF_SegmentRec seg0;
- AF_Point* contour = hints->contours;
- AF_Point* contour_limit = contour + hints->num_contours;
- AF_Direction major_dir, segment_dir;
+ AF_LatinMetrics metrics = (AF_LatinMetrics)hints->metrics;
+ AF_AxisHints axis = &hints->axis[dim];
+ FT_Memory memory = hints->memory;
+ FT_Error error = FT_Err_Ok;
+ AF_Segment segment = NULL;
+ AF_SegmentRec seg0;
+ AF_Point* contour = hints->contours;
+ AF_Point* contour_limit = contour + hints->num_contours;
+ AF_Direction major_dir, segment_dir;
+
+ FT_Pos flat_threshold = FLAT_THRESHOLD( metrics->units_per_em );
FT_ZERO( &seg0 );
@@ -1203,11 +1436,13 @@
/* do each contour separately */
for ( ; contour < contour_limit; contour++ )
{
- AF_Point point = contour[0];
- AF_Point last = point->prev;
- int on_edge = 0;
- FT_Pos min_pos = 32000; /* minimum segment pos != min_coord */
- FT_Pos max_pos = -32000; /* maximum segment pos != max_coord */
+ AF_Point point = contour[0];
+ AF_Point last = point->prev;
+ int on_edge = 0;
+ FT_Pos min_pos = 32000; /* minimum segment pos != min_coord */
+ FT_Pos max_pos = -32000; /* maximum segment pos != max_coord */
+ FT_Pos min_on_pos = 32000;
+ FT_Pos max_on_pos = -32000;
FT_Bool passed;
@@ -1249,6 +1484,16 @@
if ( u > max_pos )
max_pos = u;
+ /* get minimum and maximum coordinate of on points */
+ if ( !( point->flags & AF_FLAG_CONTROL ) )
+ {
+ v = point->v;
+ if ( v < min_on_pos )
+ min_on_pos = v;
+ if ( v > max_on_pos )
+ max_on_pos = v;
+ }
+
if ( point->out_dir != segment_dir || point == last )
{
/* we are just leaving an edge; record a new segment! */
@@ -1256,9 +1501,10 @@
segment->pos = (FT_Short)( ( min_pos + max_pos ) >> 1 );
/* a segment is round if either its first or last point */
- /* is a control point */
- if ( ( segment->first->flags | point->flags ) &
- AF_FLAG_CONTROL )
+ /* is a control point, and the length of the on points */
+ /* inbetween doesn't exceed a heuristic limit */
+ if ( ( segment->first->flags | point->flags ) & AF_FLAG_CONTROL &&
+ ( max_on_pos - min_on_pos ) < flat_threshold )
segment->flags |= AF_EDGE_ROUND;
/* compute segment size */
@@ -1301,10 +1547,19 @@
/* clear all segment fields */
segment[0] = seg0;
- segment->dir = (FT_Char)segment_dir;
+ segment->dir = (FT_Char)segment_dir;
+ segment->first = point;
+ segment->last = point;
+
min_pos = max_pos = point->u;
- segment->first = point;
- segment->last = point;
+
+ if ( point->flags & AF_FLAG_CONTROL )
+ {
+ min_on_pos = 32000;
+ max_on_pos = -32000;
+ }
+ else
+ min_on_pos = max_on_pos = point->v;
on_edge = 1;
}
@@ -1872,7 +2127,8 @@
/* the major direction) -- this assumes the TrueType convention */
/* for the orientation of contours */
is_top_blue =
- (FT_Byte)( ( blue->flags & AF_LATIN_BLUE_TOP ) != 0 );
+ (FT_Byte)( ( blue->flags & ( AF_LATIN_BLUE_TOP |
+ AF_LATIN_BLUE_SUB_TOP ) ) != 0 );
is_neutral_blue =
(FT_Byte)( ( blue->flags & AF_LATIN_BLUE_NEUTRAL ) != 0);
is_major_dir =
@@ -2805,7 +3061,8 @@
/* Apply the complete hinting algorithm to a latin glyph. */
static FT_Error
- af_latin_hints_apply( AF_GlyphHints hints,
+ af_latin_hints_apply( FT_UInt glyph_index,
+ AF_GlyphHints hints,
FT_Outline* outline,
AF_LatinMetrics metrics )
{
@@ -2847,7 +3104,9 @@
if ( error )
goto Exit;
- af_latin_hints_compute_blue_edges( hints, metrics );
+ /* apply blue zones to base characters only */
+ if ( !( metrics->root.globals->glyph_styles[glyph_index] & AF_NONBASE ) )
+ af_latin_hints_compute_blue_edges( hints, metrics );
}
/* grid-fit the outline */
@@ -2907,6 +3166,7 @@
(AF_WritingSystem_InitMetricsFunc) af_latin_metrics_init,
(AF_WritingSystem_ScaleMetricsFunc)af_latin_metrics_scale,
(AF_WritingSystem_DoneMetricsFunc) NULL,
+ (AF_WritingSystem_GetStdWidthsFunc)af_latin_get_standard_widths,
(AF_WritingSystem_InitHintsFunc) af_latin_hints_init,
(AF_WritingSystem_ApplyHintsFunc) af_latin_hints_apply
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-26 09:12:37 +0000