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Commit e7324209 authored by Nikolay Sivov's avatar Nikolay Sivov Committed by Alexandre Julliard
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dwrite: Implement contextual subsitution (GSUB lookup 5).

Signed-off-by: 's avatarNikolay Sivov <nsivov@codeweavers.com> Signed-off-by: 's avatarAlexandre Julliard <julliard@winehq.org>
parent 75a34d94
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Showing with 158 additions and 7 deletions
dlls/dwrite/opentype.c
View file @ e7324209
......@@ -610,7 +610,7 @@ struct ot_gsub_lig
UINT16 components[1];
};
struct ot_gsub_chaincontext_subst_format1
struct ot_gsub_context_subst_format1
{
UINT16 format;
UINT16 coverage;
......@@ -5205,6 +5205,157 @@ static BOOL opentype_layout_apply_chain_rule_set(const struct match_context *mc,
return FALSE;
}
static BOOL opentype_layout_apply_gsub_context_lookup(unsigned int input_count, const UINT16 *input, unsigned int lookup_count,
const UINT16 *lookup_records, const struct match_context *mc)
{
unsigned int match_positions[GLYPH_CONTEXT_MAX_LENGTH];
unsigned int match_length = 0;
return opentype_layout_context_match_input(mc, input_count, input, &match_length, match_positions) &&
opentype_layout_context_gsub_apply_lookup(mc->context, input_count, match_positions, lookup_count,
lookup_records, match_length);
}
static BOOL opentype_layout_apply_rule_set(const struct match_context *mc, unsigned int offset)
{
unsigned int input_count, lookup_count;
const struct dwrite_fonttable *table = &mc->context->table->table;
const UINT16 *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]);
if (!(input_count = table_read_be_word(table, rule_offset)))
continue;
rule_offset += 2;
if (!(lookup_count = table_read_be_word(table, rule_offset)))
continue;
rule_offset += 2;
if (!(input = table_read_ensure(table, rule_offset, (input_count - 1) * sizeof(*input))))
continue;
rule_offset += (input_count - 1) * sizeof(*input);
if (!(lookup_records = table_read_ensure(table, rule_offset, lookup_count * 2 * sizeof(*lookup_records))))
continue;
/* First applicable rule is used. */
if (opentype_layout_apply_gsub_context_lookup(input_count, input, lookup_count, lookup_records, mc))
return TRUE;
}
return FALSE;
}
static BOOL opentype_layout_apply_gsub_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 coverage_index = GLYPH_NOT_COVERED, count, offset;
UINT16 glyph, format, coverage;
BOOL ret = FALSE;
glyph = context->u.subst.glyphs[context->cur];
format = table_read_be_word(table, subtable_offset);
if (format == 1)
{
coverage = table_read_be_word(table, subtable_offset + FIELD_OFFSET(struct ot_gsub_context_subst_format1, coverage));
coverage_index = opentype_layout_is_glyph_covered(table, subtable_offset + coverage, glyph);
if (coverage_index == GLYPH_NOT_COVERED)
return FALSE;
count = table_read_be_word(table, subtable_offset + FIELD_OFFSET(struct ot_gsub_context_subst_format1,
ruleset_count));
if (coverage_index >= count)
return FALSE;
offset = table_read_be_word(table, subtable_offset + FIELD_OFFSET(struct ot_gsub_context_subst_format1,
rulesets[coverage_index]));
offset += subtable_offset;
mc.match_func = opentype_match_glyph_func;
ret = opentype_layout_apply_rule_set(&mc, offset);
}
else if (format == 2)
{
unsigned int input_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;
input_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.input_offset = input_classdef;
mc.match_func = opentype_match_class_func;
ret = opentype_layout_apply_rule_set(&mc, offset);
}
else if (format == 3)
{
unsigned int input_count, lookup_count;
const UINT16 *input, *lookup_records;
offset = subtable_offset + 2 /* format */;
input_count = table_read_be_word(table, offset);
offset += 2;
if (!input_count)
return FALSE;
lookup_count = table_read_be_word(table, offset);
offset += 2;
if (!(input = table_read_ensure(table, offset, sizeof(*input) * input_count)))
return FALSE;
offset += sizeof(*input) * input_count;
coverage_index = opentype_layout_is_glyph_covered(table, subtable_offset + GET_BE_WORD(input[0]), glyph);
if (coverage_index == GLYPH_NOT_COVERED)
return FALSE;
lookup_records = table_read_ensure(table, offset, lookup_count * 2 * sizeof(*lookup_records));
mc.input_offset = subtable_offset;
mc.match_func = opentype_match_coverage_func;
ret = opentype_layout_apply_gsub_context_lookup(input_count, input + 1, lookup_count, lookup_records, &mc);
}
else
WARN("Unknown contextual substitution format %u.\n", format);
return ret;
}
static BOOL opentype_layout_apply_gsub_chain_context_substitution(struct scriptshaping_context *context,
const struct lookup *lookup, unsigned int subtable_offset)
{
......@@ -5220,19 +5371,17 @@ static BOOL opentype_layout_apply_gsub_chain_context_substitution(struct scripts
if (format == 1)
{
coverage = table_read_be_word(table, subtable_offset +
FIELD_OFFSET(struct ot_gsub_chaincontext_subst_format1, coverage));
coverage = table_read_be_word(table, subtable_offset + FIELD_OFFSET(struct ot_gsub_context_subst_format1, coverage));
coverage_index = opentype_layout_is_glyph_covered(table, subtable_offset + coverage, glyph);
if (coverage_index == GLYPH_NOT_COVERED)
return FALSE;
count = table_read_be_word(table, subtable_offset + FIELD_OFFSET(struct ot_gsub_chaincontext_subst_format1,
ruleset_count));
count = table_read_be_word(table, subtable_offset + FIELD_OFFSET(struct ot_gsub_context_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,
offset = table_read_be_word(table, subtable_offset + FIELD_OFFSET(struct ot_gsub_context_subst_format1,
rulesets[coverage_index]));
offset += subtable_offset;
......@@ -5357,10 +5506,12 @@ static BOOL opentype_layout_apply_gsub_lookup(struct scriptshaping_context *cont
case GSUB_LOOKUP_LIGATURE_SUBST:
ret = opentype_layout_apply_gsub_lig_substitution(context, lookup, subtable_offset);
break;
case GSUB_LOOKUP_CONTEXTUAL_SUBST:
ret = opentype_layout_apply_gsub_context_substitution(context, lookup, subtable_offset);
break;
case GSUB_LOOKUP_CHAINING_CONTEXTUAL_SUBST:
ret = opentype_layout_apply_gsub_chain_context_substitution(context, lookup, subtable_offset);
break;
case GSUB_LOOKUP_CONTEXTUAL_SUBST:
case GSUB_LOOKUP_REVERSE_CHAINING_CONTEXTUAL_SUBST:
WARN("Unimplemented lookup %d.\n", lookup->type);
break;
......
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