Nikolay Sivov : dwrite: Implement chaining contextual substitution of format 2.
Module: wine Branch: master Commit: d1ae4a564771a97a685073e425f55c36094ee341 URL: https://source.winehq.org/git/wine.git/?a=commit;h=d1ae4a564771a97a685073e42... Author: Nikolay Sivov <nsivov(a)codeweavers.com> Date: Fri May 29 19:01:09 2020 +0300 dwrite: Implement chaining contextual substitution of format 2. Signed-off-by: Nikolay Sivov <nsivov(a)codeweavers.com> Signed-off-by: Alexandre Julliard <julliard(a)winehq.org> --- 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 5114e900df..f4e9d3305a 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); }
participants (1)
-
Alexandre Julliard