[PATCH 7/7] dwrite: Implement chaining contextual substitution of format 2.
Nikolay Sivov
nsivov at codeweavers.com
Fri May 29 11:01:09 CDT 2020
Signed-off-by: Nikolay Sivov <nsivov at codeweavers.com>
---
dlls/dwrite/opentype.c | 128 ++++++++++++++++++++++++++++-------------
1 file changed, 87 insertions(+), 41 deletions(-)
diff --git a/dlls/dwrite/opentype.c b/dlls/dwrite/opentype.c
index 5114e900df6..f4e9d3305a4 100644
--- a/dlls/dwrite/opentype.c
+++ b/dlls/dwrite/opentype.c
@@ -3536,6 +3536,13 @@ static BOOL opentype_match_glyph_func(UINT16 glyph, UINT16 glyph_data, const str
return glyph == glyph_data;
}
+static BOOL opentype_match_class_func(UINT16 glyph, UINT16 glyph_data, const struct match_data *data)
+{
+ const struct match_context *mc = data->mc;
+ UINT16 glyph_class = opentype_layout_get_glyph_class(&mc->context->table->table, data->subtable_offset, glyph);
+ return glyph_class == 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;
@@ -5145,14 +5152,57 @@ static BOOL opentype_layout_apply_gsub_chain_context_lookup(unsigned int backtra
opentype_layout_context_gsub_apply_lookup(mc->context, input_count, match_positions, lookup_count, lookup_records, match_length);
}
+static BOOL opentype_layout_apply_chain_rule_set(const struct match_context *mc, unsigned int offset)
+{
+ unsigned int backtrack_count, input_count, lookahead_count, lookup_count;
+ const struct dwrite_fonttable *table = &mc->context->table->table;
+ const UINT16 *backtrack, *lookahead, *input, *lookup_records;
+ const struct ot_gsub_ruleset *ruleset;
+ unsigned int i, count;
+
+ count = table_read_be_word(table, offset);
+ ruleset = table_read_ensure(table, offset, count * sizeof(ruleset->offsets));
+
+ 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;
+ }
+ }
+
+ return FALSE;
+}
+
static BOOL opentype_layout_apply_gsub_chain_context_substitution(struct scriptshaping_context *context,
const struct lookup *lookup, unsigned int subtable_offset)
{
struct match_context mc = { .context = context, .mask = lookup->mask };
const struct dwrite_fonttable *table = &context->table->table;
- 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;
+ unsigned int coverage_index = GLYPH_NOT_COVERED, count, offset;
UINT16 glyph, format, coverage;
BOOL ret = FALSE;
@@ -5162,8 +5212,6 @@ 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));
@@ -5180,51 +5228,48 @@ static BOOL opentype_layout_apply_gsub_chain_context_substitution(struct scripts
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;
- }
- }
+
+ ret = opentype_layout_apply_chain_rule_set(&mc, offset);
}
else if (format == 2)
{
- coverage = table_read_be_word(table, subtable_offset +
- FIELD_OFFSET(struct ot_gsub_chaincontext_subst_format1, coverage));
+ unsigned int backtrack_classdef, input_classdef, lookahead_classdef, rule_set_idx;
+
+ offset = subtable_offset + 2 /* format */;
+
+ 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;
- WARN("Chaining contextual substitution (2) is not supported.\n");
+ backtrack_classdef = table_read_be_word(table, offset) + subtable_offset;
+ offset += 2;
+
+ input_classdef = table_read_be_word(table, offset) + subtable_offset;
+ offset += 2;
+
+ lookahead_classdef = table_read_be_word(table, offset) + subtable_offset;
+ offset += 2;
+
+ count = table_read_be_word(table, offset);
+ offset+= 2;
+
+ rule_set_idx = opentype_layout_get_glyph_class(table, input_classdef, glyph);
+ if (rule_set_idx >= count)
+ return FALSE;
+
+ offset = table_read_be_word(table, offset + rule_set_idx * 2);
+ offset += subtable_offset;
+
+ mc.backtrack_offset = backtrack_classdef;
+ mc.input_offset = input_classdef;
+ mc.lookahead_offset = lookahead_classdef;
+ mc.match_func = opentype_match_class_func;
+
+ ret = opentype_layout_apply_chain_rule_set(&mc, offset);
}
else if (format == 3)
{
@@ -5262,6 +5307,7 @@ static BOOL opentype_layout_apply_gsub_chain_context_substitution(struct scripts
mc.input_offset = subtable_offset;
mc.lookahead_offset = subtable_offset;
mc.match_func = opentype_match_coverage_func;
+
ret = opentype_layout_apply_gsub_chain_context_lookup(backtrack_count, backtrack, input_count, input + 1,
lookahead_count, lookahead, lookup_count, lookup_records, &mc);
}
--
2.26.2
More information about the wine-devel
mailing list