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dwrite: Add stub handler for ligature substitution. 

Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Nikolay Sivov 2020-05-28 14:54:29 +03:00 committed by Alexandre Julliard
parent 2e4d71c721
commit 9479f87b8a
1 changed files with 128 additions and 30 deletions
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158
dlls/dwrite/opentype.c
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@ -585,6 +585,27 @@ struct ot_gsub_altsubst_format1
UINT16 sets[1];
};
struct ot_gsub_ligsubst_format1
{
UINT16 format;
UINT16 coverage;
UINT16 lig_set_count;
UINT16 lig_sets[1];
};
struct ot_gsub_ligset
{
UINT16 count;
UINT16 offsets[1];
};
struct ot_gsub_lig
{
UINT16 lig_glyph;
UINT16 comp_count;
UINT16 components[1];
};
struct ot_gsub_chaincontext_subst_format1
{
UINT16 format;
@ -4464,13 +4485,23 @@ void opentype_layout_apply_gpos_features(struct scriptshaping_context *context,
heap_free(lookups.lookups);
}
static void opentype_layout_replace_glyph(struct scriptshaping_context *context, UINT16 glyph)
{
UINT16 orig_glyph = context->u.subst.glyphs[context->cur];
if (glyph != orig_glyph)
{
context->u.subst.glyphs[context->cur] = glyph;
opentype_set_subst_glyph_props(context, context->cur, glyph);
}
context->cur++;
}
static BOOL opentype_layout_apply_gsub_single_substitution(struct scriptshaping_context *context, const struct lookup *lookup,
unsigned int subtable_offset)
{
const struct dwrite_fonttable *gsub = &context->table->table;
UINT16 format, coverage, orig_glyph, glyph;
unsigned int idx, coverage_index;
BOOL ret;
idx = context->cur;
orig_glyph = glyph = context->u.subst.glyphs[idx];
@ -4502,16 +4533,14 @@ static BOOL opentype_layout_apply_gsub_single_substitution(struct scriptshaping_
glyph = GET_BE_WORD(format2->substitutes[coverage_index]);
}
else
WARN("Unknown single substitution format %u.\n", format);
if ((ret = (glyph != orig_glyph)))
{
context->u.subst.glyphs[idx] = glyph;
opentype_set_subst_glyph_props(context, idx, glyph);
context->cur++;
WARN("Unknown single substitution format %u.\n", format);
return FALSE;
}
return ret;
opentype_layout_replace_glyph(context, glyph);
return TRUE;
}
static BOOL opentype_layout_gsub_ensure_buffer(struct scriptshaping_context *context, unsigned int count)
@ -4568,13 +4597,13 @@ static BOOL opentype_layout_apply_gsub_mult_substitution(struct scriptshaping_co
unsigned int subtable_offset)
{
const struct dwrite_fonttable *gsub = &context->table->table;
UINT16 format, coverage, orig_glyph, glyph, seq_count, glyph_count;
UINT16 format, coverage, glyph, seq_count, glyph_count;
const struct ot_gsub_multsubst_format1 *format1;
unsigned int i, idx, coverage_index;
const UINT16 *glyphs;
idx = context->cur;
orig_glyph = glyph = context->u.subst.glyphs[idx];
glyph = context->u.subst.glyphs[idx];
format = table_read_be_word(gsub, subtable_offset);
@ -4603,15 +4632,7 @@ static BOOL opentype_layout_apply_gsub_mult_substitution(struct scriptshaping_co
if (glyph_count == 1)
{
/* Equivalent of single substitution. */
glyph = GET_BE_WORD(glyphs[0]);
if (glyph != orig_glyph)
{
context->u.subst.glyphs[idx] = glyph;
opentype_set_subst_glyph_props(context, idx, glyph);
}
context->cur++;
opentype_layout_replace_glyph(context, GET_BE_WORD(glyphs[0]));
}
else if (glyph_count == 0)
{
@ -4682,12 +4703,11 @@ static BOOL opentype_layout_apply_gsub_alt_substitution(struct scriptshaping_con
unsigned int subtable_offset)
{
const struct dwrite_fonttable *gsub = &context->table->table;
UINT16 format, coverage, orig_glyph, glyph;
unsigned int idx, coverage_index, offset;
BOOL ret;
UINT16 format, coverage, glyph;
idx = context->cur;
orig_glyph = glyph = context->u.subst.glyphs[idx];
glyph = context->u.subst.glyphs[idx];
format = table_read_be_word(gsub, subtable_offset);
@ -4721,16 +4741,92 @@ static BOOL opentype_layout_apply_gsub_alt_substitution(struct scriptshaping_con
glyph = table_read_be_word(gsub, subtable_offset + offset + sizeof(count) + (alt_index - 1) * sizeof(glyph));
}
else
WARN("Unexpected alternate substitution format %d.\n", format);
if ((ret = (glyph != orig_glyph)))
{
context->u.subst.glyphs[idx] = glyph;
opentype_set_subst_glyph_props(context, idx, glyph);
context->cur++;
WARN("Unexpected alternate substitution format %d.\n", format);
return FALSE;
}
return ret;
opentype_layout_replace_glyph(context, glyph);
return TRUE;
}
static BOOL opentype_layout_apply_ligature(struct scriptshaping_context *context, unsigned int offset)
{
const struct dwrite_fonttable *gsub = &context->table->table;
const struct ot_gsub_lig *lig;
unsigned int comp_count;
comp_count = table_read_be_word(gsub, offset + FIELD_OFFSET(struct ot_gsub_lig, comp_count));
if (!comp_count)
return FALSE;
lig = table_read_ensure(gsub, offset, FIELD_OFFSET(struct ot_gsub_lig, components[comp_count-1]));
if (!lig)
return FALSE;
if (comp_count == 1)
{
opentype_layout_replace_glyph(context, GET_BE_WORD(lig->lig_glyph));
return TRUE;
}
/* TODO: actually apply ligature */
return FALSE;
}
static BOOL opentype_layout_apply_gsub_lig_substitution(struct scriptshaping_context *context, const struct lookup *lookup,
unsigned int subtable_offset)
{
const struct dwrite_fonttable *gsub = &context->table->table;
unsigned int coverage_index, offset, lig_set_offset, lig_set_count;
UINT16 format, coverage, glyph;
glyph = context->u.subst.glyphs[context->cur];
format = table_read_be_word(gsub, subtable_offset);
if (format == 1)
{
const struct ot_gsub_ligsubst_format1 *format1 = table_read_ensure(gsub, subtable_offset, sizeof(*format1));
const struct ot_gsub_ligset *lig_set;
unsigned int i, lig_count;
coverage = table_read_be_word(gsub, subtable_offset + FIELD_OFFSET(struct ot_gsub_ligsubst_format1, coverage));
coverage_index = opentype_layout_is_glyph_covered(context, subtable_offset + coverage, glyph);
if (coverage_index == GLYPH_NOT_COVERED)
return FALSE;
lig_set_count = table_read_be_word(gsub, subtable_offset + FIELD_OFFSET(struct ot_gsub_ligsubst_format1, lig_set_count));
if (coverage_index >= lig_set_count || !table_read_ensure(gsub, subtable_offset,
FIELD_OFFSET(struct ot_gsub_ligsubst_format1, lig_sets[lig_set_count])))
{
return FALSE;
}
lig_set_offset = table_read_be_word(gsub, subtable_offset +
FIELD_OFFSET(struct ot_gsub_ligsubst_format1, lig_sets[coverage_index]));
offset = subtable_offset + lig_set_offset;
lig_count = table_read_be_word(gsub, offset);
lig_set = table_read_ensure(gsub, offset, FIELD_OFFSET(struct ot_gsub_ligset, offsets[lig_count]));
if (!lig_count || !lig_set)
return FALSE;
/* First applicable ligature is used. */
for (i = 0; i < lig_count; ++i)
{
if (opentype_layout_apply_ligature(context, offset + GET_BE_WORD(lig_set->offsets[i])))
return TRUE;
}
}
else
WARN("Unexpected ligature substitution format %d.\n", format);
return FALSE;
}
#define CHAIN_CONTEXT_MAX_LENGTH 64
@ -5000,10 +5096,12 @@ static BOOL opentype_layout_apply_gsub_lookup(struct scriptshaping_context *cont
case GSUB_LOOKUP_ALTERNATE_SUBST:
ret = opentype_layout_apply_gsub_alt_substitution(context, lookup, subtable_offset);
break;
case GSUB_LOOKUP_LIGATURE_SUBST:
ret = opentype_layout_apply_gsub_lig_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_LIGATURE_SUBST:
case GSUB_LOOKUP_CONTEXTUAL_SUBST:
case GSUB_LOOKUP_REVERSE_CHAINING_CONTEXTUAL_SUBST:
WARN("Unimplemented lookup %d.\n", lookup->type);