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dwrite: Implement mark-to-mark attachment, GPOS lookup 6. 

Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Nikolay Sivov 2019-02-05 12:18:41 +03:00 committed by Alexandre Julliard
parent 0bee07ec57
commit 717030df10
1 changed files with 89 additions and 0 deletions
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89
dlls/dwrite/opentype.c
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@ -681,6 +681,16 @@ struct ot_gpos_mark_to_base_format1
WORD base_array;
};
struct ot_gpos_mark_to_mark_format1
{
WORD format;
WORD mark1_coverage;
WORD mark2_coverage;
WORD mark_class_count;
WORD mark1_array;
WORD mark2_array;
};
typedef struct {
WORD SubstFormat;
WORD Coverage;
@ -3503,6 +3513,85 @@ static BOOL opentype_layout_apply_gpos_mark_to_lig_attachment(const struct scrip
static BOOL opentype_layout_apply_gpos_mark_to_mark_attachment(const struct scriptshaping_context *context,
struct glyph_iterator *iter, const struct lookup *lookup)
{
struct scriptshaping_cache *cache = context->cache;
unsigned int i;
WORD format;
for (i = 0; i < lookup->subtable_count; ++i)
{
unsigned int subtable_offset = opentype_layout_get_gpos_subtable(cache, lookup->offset, i);
format = table_read_be_word(&cache->gpos.table, subtable_offset);
if (format == 1)
{
const struct ot_gpos_mark_to_mark_format1 *format1 = table_read_ensure(&cache->gpos.table,
subtable_offset, sizeof(*format1));
unsigned int count, mark1_array_offset, mark2_array_offset, mark_class_count;
unsigned int mark1_index, mark2_index, mark2_anchor;
const struct ot_gpos_mark_array *mark1_array;
const struct ot_gpos_base_array *mark2_array;
float mark1_x, mark1_y, mark2_x, mark2_y;
struct glyph_iterator mark_iter;
if (!format1)
continue;
mark1_index = opentype_layout_is_glyph_covered(&cache->gpos.table, subtable_offset +
GET_BE_WORD(format1->mark1_coverage), context->u.pos.glyphs[iter->pos]);
mark1_array_offset = subtable_offset + GET_BE_WORD(format1->mark1_array);
if (!(count = table_read_be_word(&cache->gpos.table, mark1_array_offset)))
continue;
mark1_array = table_read_ensure(&cache->gpos.table, mark1_array_offset,
FIELD_OFFSET(struct ot_gpos_mark_array, records[count]));
if (!mark1_array)
continue;
if (mark1_index == GLYPH_NOT_COVERED || mark1_index >= count)
continue;
glyph_iterator_init(context, lookup->flags & ~LOOKUP_FLAG_IGNORE_MASK, iter->pos, 1, &mark_iter);
if (!glyph_iterator_prev(&mark_iter))
continue;
if (!context->u.pos.glyph_props[mark_iter.pos].isDiacritic)
continue;
mark2_array_offset = subtable_offset + GET_BE_WORD(format1->mark2_array);
if (!(count = table_read_be_word(&cache->gpos.table, mark2_array_offset)))
continue;
mark_class_count = GET_BE_WORD(format1->mark_class_count);
mark2_array = table_read_ensure(&cache->gpos.table, mark2_array_offset,
FIELD_OFFSET(struct ot_gpos_base_array, offsets[count * mark_class_count]));
if (!mark2_array)
continue;
mark2_index = opentype_layout_is_glyph_covered(&cache->gpos.table, subtable_offset +
GET_BE_WORD(format1->mark2_coverage), context->u.pos.glyphs[mark_iter.pos]);
if (mark2_index == GLYPH_NOT_COVERED || mark2_index >= count)
continue;
mark2_anchor = GET_BE_WORD(mark2_array->offsets[mark2_index * mark_class_count +
GET_BE_WORD(mark1_array->records[mark1_index].mark_class)]);
opentype_layout_gpos_get_anchor(context, mark1_array_offset +
GET_BE_WORD(mark1_array->records[mark1_index].mark_anchor), iter->pos, &mark1_x, &mark1_y);
opentype_layout_gpos_get_anchor(context, mark2_array_offset + mark2_anchor, mark_iter.pos,
&mark2_x, &mark2_y);
context->offsets[iter->pos].advanceOffset = mark2_x - mark1_x;
context->offsets[iter->pos].ascenderOffset = mark2_y - mark1_y;
break;
}
else
WARN("Unknown mark-to-mark format %u.\n", format);
}
return FALSE;
}