dwrite: Implement contextual subsitution (GSUB lookup 5).
Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Nikolay Sivov
Alexandre Julliard
parent
75a34d9408
commit
e7324209e0
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@ -610,7 +610,7 @@ struct ot_gsub_lig
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UINT16 components[1];
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};
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struct ot_gsub_chaincontext_subst_format1
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struct ot_gsub_context_subst_format1
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{
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UINT16 format;
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UINT16 coverage;
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@ -5205,6 +5205,157 @@ static BOOL opentype_layout_apply_chain_rule_set(const struct match_context *mc,
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return FALSE;
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}
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static BOOL opentype_layout_apply_gsub_context_lookup(unsigned int input_count, const UINT16 *input, unsigned int lookup_count,
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const UINT16 *lookup_records, const struct match_context *mc)
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{
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unsigned int match_positions[GLYPH_CONTEXT_MAX_LENGTH];
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unsigned int match_length = 0;
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return opentype_layout_context_match_input(mc, input_count, input, &match_length, match_positions) &&
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opentype_layout_context_gsub_apply_lookup(mc->context, input_count, match_positions, lookup_count,
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lookup_records, match_length);
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}
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static BOOL opentype_layout_apply_rule_set(const struct match_context *mc, unsigned int offset)
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{
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unsigned int input_count, lookup_count;
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const struct dwrite_fonttable *table = &mc->context->table->table;
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const UINT16 *input, *lookup_records;
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const struct ot_gsub_ruleset *ruleset;
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unsigned int i, count;
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count = table_read_be_word(table, offset);
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ruleset = table_read_ensure(table, offset, count * sizeof(ruleset->offsets));
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for (i = 0; i < count; ++i)
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{
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unsigned int rule_offset = offset + GET_BE_WORD(ruleset->offsets[i]);
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if (!(input_count = table_read_be_word(table, rule_offset)))
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continue;
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rule_offset += 2;
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if (!(lookup_count = table_read_be_word(table, rule_offset)))
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continue;
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rule_offset += 2;
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if (!(input = table_read_ensure(table, rule_offset, (input_count - 1) * sizeof(*input))))
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continue;
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rule_offset += (input_count - 1) * sizeof(*input);
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if (!(lookup_records = table_read_ensure(table, rule_offset, lookup_count * 2 * sizeof(*lookup_records))))
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continue;
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/* First applicable rule is used. */
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if (opentype_layout_apply_gsub_context_lookup(input_count, input, lookup_count, lookup_records, mc))
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return TRUE;
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}
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return FALSE;
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}
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static BOOL opentype_layout_apply_gsub_context_substitution(struct scriptshaping_context *context, const struct lookup *lookup,
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unsigned int subtable_offset)
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{
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struct match_context mc = { .context = context, .mask = lookup->mask };
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const struct dwrite_fonttable *table = &context->table->table;
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unsigned int coverage_index = GLYPH_NOT_COVERED, count, offset;
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UINT16 glyph, format, coverage;
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BOOL ret = FALSE;
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glyph = context->u.subst.glyphs[context->cur];
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format = table_read_be_word(table, subtable_offset);
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if (format == 1)
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{
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coverage = table_read_be_word(table, subtable_offset + FIELD_OFFSET(struct ot_gsub_context_subst_format1, coverage));
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coverage_index = opentype_layout_is_glyph_covered(table, subtable_offset + coverage, glyph);
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if (coverage_index == GLYPH_NOT_COVERED)
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return FALSE;
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count = table_read_be_word(table, subtable_offset + FIELD_OFFSET(struct ot_gsub_context_subst_format1,
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ruleset_count));
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if (coverage_index >= count)
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return FALSE;
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offset = table_read_be_word(table, subtable_offset + FIELD_OFFSET(struct ot_gsub_context_subst_format1,
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rulesets[coverage_index]));
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offset += subtable_offset;
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mc.match_func = opentype_match_glyph_func;
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ret = opentype_layout_apply_rule_set(&mc, offset);
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}
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else if (format == 2)
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{
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unsigned int input_classdef, rule_set_idx;
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offset = subtable_offset + 2 /* format */;
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coverage = table_read_be_word(table, offset);
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offset += 2;
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coverage_index = opentype_layout_is_glyph_covered(table, subtable_offset + coverage, glyph);
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if (coverage_index == GLYPH_NOT_COVERED)
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return FALSE;
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input_classdef = table_read_be_word(table, offset) + subtable_offset;
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offset += 2;
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count = table_read_be_word(table, offset);
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offset+= 2;
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rule_set_idx = opentype_layout_get_glyph_class(table, input_classdef, glyph);
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if (rule_set_idx >= count)
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return FALSE;
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offset = table_read_be_word(table, offset + rule_set_idx * 2);
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offset += subtable_offset;
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mc.input_offset = input_classdef;
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mc.match_func = opentype_match_class_func;
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ret = opentype_layout_apply_rule_set(&mc, offset);
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}
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else if (format == 3)
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{
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unsigned int input_count, lookup_count;
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const UINT16 *input, *lookup_records;
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offset = subtable_offset + 2 /* format */;
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input_count = table_read_be_word(table, offset);
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offset += 2;
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if (!input_count)
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return FALSE;
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lookup_count = table_read_be_word(table, offset);
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offset += 2;
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if (!(input = table_read_ensure(table, offset, sizeof(*input) * input_count)))
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return FALSE;
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offset += sizeof(*input) * input_count;
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coverage_index = opentype_layout_is_glyph_covered(table, subtable_offset + GET_BE_WORD(input[0]), glyph);
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if (coverage_index == GLYPH_NOT_COVERED)
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return FALSE;
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lookup_records = table_read_ensure(table, offset, lookup_count * 2 * sizeof(*lookup_records));
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mc.input_offset = subtable_offset;
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mc.match_func = opentype_match_coverage_func;
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ret = opentype_layout_apply_gsub_context_lookup(input_count, input + 1, lookup_count, lookup_records, &mc);
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}
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else
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WARN("Unknown contextual substitution format %u.\n", format);
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return ret;
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}
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static BOOL opentype_layout_apply_gsub_chain_context_substitution(struct scriptshaping_context *context,
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const struct lookup *lookup, unsigned int subtable_offset)
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{
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@ -5220,19 +5371,17 @@ static BOOL opentype_layout_apply_gsub_chain_context_substitution(struct scripts
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if (format == 1)
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{
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coverage = table_read_be_word(table, subtable_offset +
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FIELD_OFFSET(struct ot_gsub_chaincontext_subst_format1, coverage));
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coverage = table_read_be_word(table, subtable_offset + FIELD_OFFSET(struct ot_gsub_context_subst_format1, coverage));
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coverage_index = opentype_layout_is_glyph_covered(table, subtable_offset + coverage, glyph);
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if (coverage_index == GLYPH_NOT_COVERED)
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return FALSE;
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count = table_read_be_word(table, subtable_offset + FIELD_OFFSET(struct ot_gsub_chaincontext_subst_format1,
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ruleset_count));
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count = table_read_be_word(table, subtable_offset + FIELD_OFFSET(struct ot_gsub_context_subst_format1, ruleset_count));
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if (coverage_index >= count)
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return FALSE;
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offset = table_read_be_word(table, subtable_offset + FIELD_OFFSET(struct ot_gsub_chaincontext_subst_format1,
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offset = table_read_be_word(table, subtable_offset + FIELD_OFFSET(struct ot_gsub_context_subst_format1,
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rulesets[coverage_index]));
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offset += subtable_offset;
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@ -5357,10 +5506,12 @@ static BOOL opentype_layout_apply_gsub_lookup(struct scriptshaping_context *cont
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case GSUB_LOOKUP_LIGATURE_SUBST:
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ret = opentype_layout_apply_gsub_lig_substitution(context, lookup, subtable_offset);
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break;
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case GSUB_LOOKUP_CONTEXTUAL_SUBST:
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ret = opentype_layout_apply_gsub_context_substitution(context, lookup, subtable_offset);
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break;
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case GSUB_LOOKUP_CHAINING_CONTEXTUAL_SUBST:
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ret = opentype_layout_apply_gsub_chain_context_substitution(context, lookup, subtable_offset);
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break;
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case GSUB_LOOKUP_CONTEXTUAL_SUBST:
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case GSUB_LOOKUP_REVERSE_CHAINING_CONTEXTUAL_SUBST:
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WARN("Unimplemented lookup %d.\n", lookup->type);
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break;
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