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dwrite: Implement chaining contextual substitution of format 1. 

Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Nikolay Sivov 2020-05-29 19:01:08 +03:00 committed by Alexandre Julliard
parent a1d1647131
commit 7e798dae37
1 changed files with 60 additions and 3 deletions
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63
dlls/dwrite/opentype.c
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@ -618,6 +618,12 @@ struct ot_gsub_chaincontext_subst_format1
UINT16 rulesets[1];
};
struct ot_gsub_ruleset
{
UINT16 count;
UINT16 offsets[1];
};
struct ot_feature
{
WORD feature_params;
@ -3525,6 +3531,11 @@ struct ot_gdef_mark_glyph_sets
DWORD offsets[1];
};
static BOOL opentype_match_glyph_func(UINT16 glyph, UINT16 glyph_data, const struct match_data *data)
{
return glyph == glyph_data;
}
static BOOL opentype_match_coverage_func(UINT16 glyph, UINT16 glyph_data, const struct match_data *data)
{
const struct match_context *mc = data->mc;
@ -5139,7 +5150,9 @@ static BOOL opentype_layout_apply_gsub_chain_context_substitution(struct scripts
{
struct match_context mc = { .context = context, .mask = lookup->mask };
const struct dwrite_fonttable *table = &context->table->table;
unsigned int coverage_index = GLYPH_NOT_COVERED;
unsigned int i, coverage_index = GLYPH_NOT_COVERED, count, offset;
unsigned int backtrack_count, input_count, lookahead_count, lookup_count;
const UINT16 *backtrack, *lookahead, *input, *lookup_records;
UINT16 glyph, format, coverage;
BOOL ret = FALSE;
@ -5149,6 +5162,8 @@ static BOOL opentype_layout_apply_gsub_chain_context_substitution(struct scripts
if (format == 1)
{
const struct ot_gsub_ruleset *ruleset;
coverage = table_read_be_word(table, subtable_offset +
FIELD_OFFSET(struct ot_gsub_chaincontext_subst_format1, coverage));
@ -5156,7 +5171,49 @@ static BOOL opentype_layout_apply_gsub_chain_context_substitution(struct scripts
if (coverage_index == GLYPH_NOT_COVERED)
return FALSE;
WARN("Chaining contextual substitution (1) is not supported.\n");
count = table_read_be_word(table, subtable_offset + FIELD_OFFSET(struct ot_gsub_chaincontext_subst_format1,
ruleset_count));
if (coverage_index >= count)
return FALSE;
offset = table_read_be_word(table, subtable_offset + FIELD_OFFSET(struct ot_gsub_chaincontext_subst_format1,
rulesets[coverage_index]));
offset += subtable_offset;
count = table_read_be_word(table, offset);
ruleset = table_read_ensure(table, offset, count * sizeof(ruleset->offsets));
mc.match_func = opentype_match_glyph_func;
for (i = 0; i < count; ++i)
{
unsigned int rule_offset = offset + GET_BE_WORD(ruleset->offsets[i]);
backtrack_count = table_read_be_word(table, rule_offset);
rule_offset += 2;
backtrack = table_read_ensure(table, rule_offset, backtrack_count * sizeof(*backtrack));
rule_offset += backtrack_count * sizeof(*backtrack);
input_count = table_read_be_word(table, rule_offset);
rule_offset += 2;
input = table_read_ensure(table, rule_offset, input_count * sizeof(*input));
rule_offset += input_count * sizeof(*input);
lookahead_count = table_read_be_word(table, rule_offset);
rule_offset += 2;
lookahead = table_read_ensure(table, rule_offset, lookahead_count * sizeof(*lookahead));
rule_offset += lookahead_count * sizeof(*lookahead);
lookup_count = table_read_be_word(table, rule_offset);
rule_offset += 2;
lookup_records = table_read_ensure(table, rule_offset, lookup_count * 2 * sizeof(*lookup_records));
/* First applicable rule is used. */
if (opentype_layout_apply_gsub_chain_context_lookup(backtrack_count, backtrack, input_count, input, lookahead_count,
lookahead, lookup_count, lookup_records, &mc))
{
return TRUE;
}
}
}
else if (format == 2)
{
@ -5174,7 +5231,7 @@ static BOOL opentype_layout_apply_gsub_chain_context_substitution(struct scripts
unsigned int backtrack_count, input_count, lookahead_count, lookup_count;
const UINT16 *backtrack, *lookahead, *input, *lookup_records;
unsigned int offset = subtable_offset + 2 /* format */;
offset = subtable_offset + 2 /* format */;
backtrack_count = table_read_be_word(table, offset);
offset += 2;