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dwrite: Implement 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 2020-06-11 15:08:59 +03:00 committed by Alexandre Julliard
parent cd9f374879
commit 292dff589e
2 changed files with 97 additions and 39 deletions
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2
dlls/dwrite/dwrite_private.h
View File

@ -529,7 +529,7 @@ struct shaping_glyph_properties
UINT16 isZeroWidthSpace : 1;
UINT16 reserved : 1;
UINT16 components : 4;
UINT16 reserved2 : 4;
UINT16 lig_component : 4;
};
struct scriptshaping_context;

134
dlls/dwrite/opentype.c
View File

@ -5104,11 +5104,71 @@ static BOOL opentype_layout_apply_gsub_alt_substitution(struct scriptshaping_con
return TRUE;
}
static BOOL opentype_layout_apply_ligature(struct scriptshaping_context *context, unsigned int offset)
static BOOL opentype_layout_context_match_input(const struct match_context *mc, unsigned int count, const UINT16 *input,
unsigned int *end_offset, unsigned int *match_positions)
{
struct match_data match_data = { .mc = mc, .subtable_offset = mc->input_offset };
struct scriptshaping_context *context = mc->context;
struct glyph_iterator iter;
unsigned int i;
if (count > GLYPH_CONTEXT_MAX_LENGTH)
return FALSE;
match_positions[0] = context->cur;
glyph_iterator_init(context, mc->lookup->flags, context->cur, count - 1, &iter);
iter.mask = mc->lookup->mask;
iter.match_func = mc->match_func;
iter.match_data = &match_data;
iter.glyph_data = input;
for (i = 1; i < count; ++i)
{
if (!glyph_iterator_next(&iter))
return FALSE;
match_positions[i] = iter.pos;
}
*end_offset = iter.pos - context->cur + 1;
return TRUE;
}
static void opentype_layout_unsafe_to_break(struct scriptshaping_context *context, unsigned int idx)
{
if (context->u.buffer.glyph_props[idx].isClusterStart)
context->u.buffer.text_props[context->glyph_infos[idx].start_text_idx].canBreakShapingAfter = 0;
}
static void opentype_layout_delete_glyph(struct scriptshaping_context *context, unsigned int idx)
{
unsigned int shift_len;
shift_len = context->glyph_count - context->cur - 1;
if (shift_len)
{
memmove(&context->u.buffer.glyphs[idx], &context->u.buffer.glyphs[idx + 1],
shift_len * sizeof(*context->u.buffer.glyphs));
memmove(&context->u.buffer.glyph_props[idx], &context->u.buffer.glyph_props[idx + 1],
shift_len * sizeof(*context->u.buffer.glyph_props));
memmove(&context->glyph_infos[idx], &context->glyph_infos[idx + 1], shift_len * sizeof(*context->glyph_infos));
}
context->glyph_count--;
}
static BOOL opentype_layout_apply_ligature(struct scriptshaping_context *context, unsigned int offset,
const struct lookup *lookup)
{
struct match_context mc = { .context = context, .lookup = lookup, .match_func = opentype_match_glyph_func };
const struct dwrite_fonttable *gsub = &context->table->table;
unsigned int match_positions[GLYPH_CONTEXT_MAX_LENGTH];
unsigned int i, j, comp_count, match_length = 0;
const struct ot_gsub_lig *lig;
unsigned int comp_count;
UINT16 lig_glyph;
comp_count = table_read_be_word(gsub, offset + FIELD_OFFSET(struct ot_gsub_lig, comp_count));
@ -5119,16 +5179,46 @@ static BOOL opentype_layout_apply_ligature(struct scriptshaping_context *context
if (!lig)
return FALSE;
lig_glyph = GET_BE_WORD(lig->lig_glyph);
if (comp_count == 1)
{
opentype_layout_replace_glyph(context, GET_BE_WORD(lig->lig_glyph));
opentype_layout_replace_glyph(context, lig_glyph);
context->cur++;
return TRUE;
}
/* TODO: actually apply ligature */
if (!opentype_layout_context_match_input(&mc, comp_count, lig->components, &match_length, match_positions))
return FALSE;
return FALSE;
opentype_layout_replace_glyph(context, lig_glyph);
context->u.buffer.glyph_props[context->cur].components = comp_count;
/* Positioning against a ligature implies keeping track of ligature component
glyph should be attached to. Update per-glyph property for interleaving glyphs,
0 means attaching to last component, n - attaching to n-th glyph before last. */
for (i = 1; i < comp_count; ++i)
{
j = match_positions[i - 1] + 1;
while (j < match_positions[i])
{
context->u.buffer.glyph_props[j++].lig_component = comp_count - i;
}
opentype_layout_unsafe_to_break(context, i);
context->u.buffer.glyph_props[i].isClusterStart = 0;
context->glyph_infos[i].start_text_idx = 0;
}
/* Delete ligated glyphs, backwards to preserve index. */
for (i = 1; i < comp_count; ++i)
{
opentype_layout_delete_glyph(context, match_positions[comp_count - i]);
}
/* Skip whole matched sequence, accounting for deleted glyphs. */
context->cur += match_length - (comp_count - 1);
return TRUE;
}
static BOOL opentype_layout_apply_gsub_lig_substitution(struct scriptshaping_context *context, const struct lookup *lookup,
@ -5173,7 +5263,7 @@ static BOOL opentype_layout_apply_gsub_lig_substitution(struct scriptshaping_con
/* 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])))
if (opentype_layout_apply_ligature(context, offset + GET_BE_WORD(lig_set->offsets[i]), lookup))
return TRUE;
}
}
@ -5183,38 +5273,6 @@ static BOOL opentype_layout_apply_gsub_lig_substitution(struct scriptshaping_con
return FALSE;
}
static BOOL opentype_layout_context_match_input(const struct match_context *mc, unsigned int count, const UINT16 *input,
unsigned int *end_offset, unsigned int *match_positions)
{
struct match_data match_data = { .mc = mc, .subtable_offset = mc->input_offset };
struct scriptshaping_context *context = mc->context;
struct glyph_iterator iter;
unsigned int i;
if (count > GLYPH_CONTEXT_MAX_LENGTH)
return FALSE;
match_positions[0] = context->cur;
glyph_iterator_init(context, mc->lookup->flags, context->cur, count - 1, &iter);
iter.mask = mc->lookup->mask;
iter.match_func = mc->match_func;
iter.match_data = &match_data;
iter.glyph_data = input;
for (i = 1; i < count; ++i)
{
if (!glyph_iterator_next(&iter))
return FALSE;
match_positions[i] = iter.pos;
}
*end_offset = iter.pos - context->cur + 1;
return TRUE;
}
static BOOL opentype_layout_context_match_backtrack(const struct match_context *mc, unsigned int count,
const UINT16 *backtrack, unsigned int *match_start)
{