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Add ltra, ltrm, and rtla features

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This commit is contained in:
Behdad Esfahbod 2010-05-21 17:53:10 +01:00
parent 1ce7b87c4d
commit 074ea78749
1 changed files with 48 additions and 12 deletions
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60
src/hb-ot-shape.cc
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@ -74,6 +74,28 @@ add_feature (hb_face_t *face,
}
}
static hb_bool_t
maybe_add_feature (hb_face_t *face,
hb_tag_t table_tag,
unsigned int script_index,
unsigned int language_index,
hb_tag_t feature_tag,
hb_mask_t mask,
lookup_map *lookups,
unsigned int *num_lookups,
unsigned int room_lookups)
{
unsigned int feature_index;
if (hb_ot_layout_language_find_feature (face, table_tag, script_index, language_index,
feature_tag,
&feature_index))
{
add_feature (face, table_tag, feature_index, mask, lookups, num_lookups, room_lookups);
return TRUE;
}
return FALSE;
}
static int
cmp_lookups (const void *p1, const void *p2)
{
@ -90,7 +112,8 @@ setup_lookups (hb_face_t *face,
unsigned int num_features,
hb_tag_t table_tag,
lookup_map *lookups,
unsigned int *num_lookups)
unsigned int *num_lookups,
hb_direction_t original_direction)
{
unsigned int i, j, script_index, language_index, feature_index, room_lookups;
@ -109,11 +132,20 @@ setup_lookups (hb_face_t *face,
add_feature (face, table_tag, feature_index, 1, lookups, num_lookups, room_lookups);
for (i = 0; i < ARRAY_LENGTH (default_features); i++)
{
if (hb_ot_layout_language_find_feature (face, table_tag, script_index, language_index,
default_features[i],
&feature_index))
add_feature (face, table_tag, feature_index, 1, lookups, num_lookups, room_lookups);
maybe_add_feature (face, table_tag, script_index, language_index, default_features[i], 1, lookups, num_lookups, room_lookups);
switch (original_direction) {
case HB_DIRECTION_LTR:
maybe_add_feature (face, table_tag, script_index, language_index, HB_TAG ('l','t','r','a'), 1, lookups, num_lookups, room_lookups);
maybe_add_feature (face, table_tag, script_index, language_index, HB_TAG ('l','t','r','m'), 1, lookups, num_lookups, room_lookups);
break;
case HB_DIRECTION_RTL:
maybe_add_feature (face, table_tag, script_index, language_index, HB_TAG ('r','t','l','a'), 1, lookups, num_lookups, room_lookups);
break;
case HB_DIRECTION_TTB:
case HB_DIRECTION_BTT:
default:
break;
}
/* Clear buffer masks. */
@ -178,7 +210,8 @@ hb_ot_substitute_complex (hb_font_t *font HB_UNUSED,
hb_face_t *face,
hb_buffer_t *buffer,
hb_feature_t *features,
unsigned int num_features)
unsigned int num_features,
hb_direction_t original_direction)
{
lookup_map lookups[1000];
unsigned int num_lookups = ARRAY_LENGTH (lookups);
@ -189,7 +222,8 @@ hb_ot_substitute_complex (hb_font_t *font HB_UNUSED,
setup_lookups (face, buffer, features, num_features,
HB_OT_TAG_GSUB,
lookups, &num_lookups);
lookups, &num_lookups,
original_direction);
for (i = 0; i < num_lookups; i++)
hb_ot_layout_substitute_lookup (face, buffer, lookups[i].index, lookups[i].mask);
@ -202,7 +236,8 @@ hb_ot_position_complex (hb_font_t *font,
hb_face_t *face,
hb_buffer_t *buffer,
hb_feature_t *features,
unsigned int num_features)
unsigned int num_features,
hb_direction_t original_direction)
{
lookup_map lookups[1000];
unsigned int num_lookups = ARRAY_LENGTH (lookups);
@ -213,7 +248,8 @@ hb_ot_position_complex (hb_font_t *font,
setup_lookups (face, buffer, features, num_features,
HB_OT_TAG_GPOS,
lookups, &num_lookups);
lookups, &num_lookups,
original_direction);
for (i = 0; i < num_lookups; i++)
hb_ot_layout_position_lookup (font, face, buffer, lookups[i].index, lookups[i].mask);
@ -401,14 +437,14 @@ hb_ot_shape (hb_font_t *font,
* see the original direction. */
original_direction = hb_ensure_native_direction (buffer);
substitute_fallback = !hb_ot_substitute_complex (font, face, buffer, features, num_features);
substitute_fallback = !hb_ot_substitute_complex (font, face, buffer, features, num_features, original_direction);
if (substitute_fallback)
hb_substitute_complex_fallback (font, face, buffer, features, num_features);
hb_position_default (font, face, buffer, features, num_features);
position_fallback = !hb_ot_position_complex (font, face, buffer, features, num_features);
position_fallback = !hb_ot_position_complex (font, face, buffer, features, num_features, original_direction);
if (position_fallback)
hb_position_complex_fallback (font, face, buffer, features, num_features);