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dwrite: Implement reverse chain contextual substitution (GSUB lookup 8). 

Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Nikolay Sivov 2020-06-02 11:48:49 +03:00 committed by Alexandre Julliard
parent 68b5a0574c
commit f2db3b58d6
1 changed files with 67 additions and 2 deletions
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69
dlls/dwrite/opentype.c
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@ -4661,7 +4661,6 @@ static void opentype_layout_replace_glyph(struct scriptshaping_context *context,
context->u.subst.glyphs[context->cur] = glyph;
opentype_set_subst_glyph_props(context, context->cur);
}
context->cur++;
}
static BOOL opentype_layout_apply_gsub_single_substitution(struct scriptshaping_context *context, const struct lookup *lookup,
@ -4707,6 +4706,7 @@ static BOOL opentype_layout_apply_gsub_single_substitution(struct scriptshaping_
}
opentype_layout_replace_glyph(context, glyph);
context->cur++;
return TRUE;
}
@ -4801,6 +4801,7 @@ static BOOL opentype_layout_apply_gsub_mult_substitution(struct scriptshaping_co
{
/* Equivalent of single substitution. */
opentype_layout_replace_glyph(context, GET_BE_WORD(glyphs[0]));
context->cur++;
}
else if (glyph_count == 0)
{
@ -4915,6 +4916,7 @@ static BOOL opentype_layout_apply_gsub_alt_substitution(struct scriptshaping_con
}
opentype_layout_replace_glyph(context, glyph);
context->cur++;
return TRUE;
}
@ -4937,6 +4939,7 @@ static BOOL opentype_layout_apply_ligature(struct scriptshaping_context *context
if (comp_count == 1)
{
opentype_layout_replace_glyph(context, GET_BE_WORD(lig->lig_glyph));
context->cur++;
return TRUE;
}
@ -5476,6 +5479,68 @@ static BOOL opentype_layout_apply_gsub_chain_context_substitution(struct scripts
return ret;
}
static BOOL opentype_layout_apply_gsub_reverse_chain_context_substitution(struct scriptshaping_context *context,
const struct lookup *lookup, unsigned int subtable_offset)
{
const struct dwrite_fonttable *table = &context->table->table;
unsigned int offset = subtable_offset;
UINT16 glyph, format;
glyph = context->u.subst.glyphs[context->cur];
format = table_read_be_word(table, offset);
offset += 2;
if (format == 1)
{
struct match_context mc = { .context = context, .mask = lookup->mask };
unsigned int start_index = 0, end_index = 0, backtrack_count, lookahead_count;
unsigned int coverage, coverage_index;
const UINT16 *backtrack, *lookahead;
coverage = table_read_be_word(table, offset);
offset += 2;
coverage_index = opentype_layout_is_glyph_covered(table, subtable_offset + coverage, glyph);
if (coverage_index == GLYPH_NOT_COVERED)
return FALSE;
backtrack_count = table_read_be_word(table, offset);
offset += 2;
backtrack = table_read_ensure(table, offset, sizeof(*backtrack) * backtrack_count);
offset += sizeof(*backtrack) * backtrack_count;
lookahead_count = table_read_be_word(table, offset);
offset += 2;
lookahead = table_read_ensure(table, offset, sizeof(*lookahead) * lookahead_count);
offset += sizeof(*lookahead) * lookahead_count;
mc.match_func = opentype_match_coverage_func;
mc.backtrack_offset = subtable_offset;
mc.lookahead_offset = subtable_offset;
if (opentype_layout_context_match_backtrack(&mc, backtrack_count, backtrack, &start_index) &&
opentype_layout_context_match_lookahead(&mc, lookahead_count, lookahead, 1, &end_index))
{
unsigned int glyph_count = table_read_be_word(table, offset);
if (coverage_index >= glyph_count)
return FALSE;
offset += 2;
glyph = table_read_be_word(table, offset + coverage_index * sizeof(glyph));
opentype_layout_replace_glyph(context, glyph);
return TRUE;
}
}
else
WARN("Unknown reverse chaining contextual substitution format %u.\n", format);
return FALSE;
}
static BOOL opentype_layout_apply_gsub_lookup(struct scriptshaping_context *context, const struct lookup *lookup)
{
unsigned int i, lookup_type;
@ -5515,7 +5580,7 @@ static BOOL opentype_layout_apply_gsub_lookup(struct scriptshaping_context *cont
ret = opentype_layout_apply_gsub_chain_context_substitution(context, lookup, subtable_offset);
break;
case GSUB_LOOKUP_REVERSE_CHAINING_CONTEXTUAL_SUBST:
WARN("Unimplemented lookup %d.\n", lookup->type);
ret = opentype_layout_apply_gsub_reverse_chain_context_substitution(context, lookup, subtable_offset);
break;
case GSUB_LOOKUP_EXTENSION_SUBST:
WARN("Invalid lookup type for extension substitution %#x.\n", lookup_type);