ReceiveTempSMS
/
Sweden-Number
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

dwrite: Implement alternate substitution (GSUB lookup 3). 

Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Nikolay Sivov 2020-05-27 10:14:23 +03:00 committed by Alexandre Julliard
parent 3abcf68af9
commit d5058fb304
1 changed files with 83 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

84
dlls/dwrite/opentype.c
View File

@ -569,6 +569,14 @@ struct ot_gsub_singlesubst_format2
UINT16 substitutes[1];
};
struct ot_gsub_altsubst_format1
{
UINT16 format;
UINT16 coverage;
UINT16 count;
UINT16 sets[1];
};
struct ot_gsub_chaincontext_subst_format1
{
UINT16 format;
@ -3256,6 +3264,23 @@ static inline unsigned int dwrite_popcount(unsigned int x)
#endif
}
static inline unsigned int dwrite_ctz(unsigned int x)
{
#if defined(__GNUC__) && ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 3)))
return __builtin_ctz(x);
#else
unsigned int c = 32;
x &= - (int) x;
if (x) c--;
if (x & 0x0000ffff) c -= 16;
if (x & 0x00ff00ff) c -= 8;
if (x & 0x0f0f0f0f) c -= 4;
if (x & 0x33333333) c -= 2;
if (x & 0x55555555) c -= 1;
return c;
#endif
}
static inline unsigned int dwrite_log2i(unsigned int x)
{
#if defined(__GNUC__) && ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 3)))
@ -4505,6 +4530,61 @@ static BOOL opentype_layout_apply_gsub_single_substitution(struct scriptshaping_
return ret;
}
static BOOL opentype_layout_apply_gsub_alt_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, offset;
BOOL ret;
idx = context->cur;
orig_glyph = glyph = context->u.subst.glyphs[idx];
format = table_read_be_word(gsub, subtable_offset);
if (format == 1)
{
const struct ot_gsub_altsubst_format1 *format1 = table_read_ensure(gsub, subtable_offset, sizeof(*format1));
unsigned int count, shift, alt_index;
coverage = table_read_be_word(gsub, subtable_offset + FIELD_OFFSET(struct ot_gsub_altsubst_format1, coverage));
coverage_index = opentype_layout_is_glyph_covered(context, subtable_offset + coverage, glyph);
if (coverage_index == GLYPH_NOT_COVERED)
return FALSE;
if (coverage_index >= GET_BE_WORD(format1->count))
return FALSE;
offset = table_read_be_word(gsub, subtable_offset +
FIELD_OFFSET(struct ot_gsub_altsubst_format1, sets[coverage_index]));
count = table_read_be_word(gsub, subtable_offset + offset);
if (!count)
return FALSE;
shift = dwrite_ctz(lookup->mask);
alt_index = (lookup->mask & context->glyph_infos[idx].mask) >> shift;
if (alt_index > count || !alt_index)
return FALSE;
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++;
}
return ret;
}
#define CHAIN_CONTEXT_MAX_LENGTH 64
static BOOL opentype_layout_context_match_input(struct scriptshaping_context *context, unsigned int subtable_offset,
@ -4785,11 +4865,13 @@ static BOOL opentype_layout_apply_gsub_lookup(struct scriptshaping_context *cont
case GSUB_LOOKUP_SINGLE_SUBST:
ret = opentype_layout_apply_gsub_single_substitution(context, lookup, subtable_offset);
break;
case GSUB_LOOKUP_ALTERNATE_SUBST:
ret = opentype_layout_apply_gsub_alt_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_MULTIPLE_SUBST:
case GSUB_LOOKUP_ALTERNATE_SUBST:
case GSUB_LOOKUP_LIGATURE_SUBST:
case GSUB_LOOKUP_CONTEXTUAL_SUBST:
case GSUB_LOOKUP_REVERSE_CHAINING_CONTEXTUAL_SUBST: