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dwrite: Add matching callback support for iterators. 

Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Nikolay Sivov 2020-05-29 19:01:06 +03:00 committed by Alexandre Julliard
parent d7d276c34b
commit 4d23336882
1 changed files with 61 additions and 6 deletions
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67
dlls/dwrite/opentype.c
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@ -3466,12 +3466,26 @@ struct ot_lookup
unsigned int flags;
};
enum iterator_match
{
/* First two to fit matching callback result. */
ITER_NO = 0,
ITER_YES = 1,
ITER_MAYBE,
};
typedef BOOL (*p_match_func)(UINT16 glyph, UINT16 glyph_data, const void *match_data);
struct glyph_iterator
{
struct scriptshaping_context *context;
unsigned int flags;
unsigned int pos;
unsigned int len;
unsigned int mask;
p_match_func match_func;
const UINT16 *glyph_data;
const void *match_data;
};
static void glyph_iterator_init(struct scriptshaping_context *context, unsigned int flags, unsigned int pos,
@ -3481,6 +3495,10 @@ static void glyph_iterator_init(struct scriptshaping_context *context, unsigned
iter->flags = flags;
iter->pos = pos;
iter->len = len;
iter->mask = ~0u; /* TODO: input sequences should be using actual mask */
iter->match_func = NULL;
iter->match_data = NULL;
iter->glyph_data = NULL;
}
struct ot_gdef_mark_glyph_sets
@ -3535,21 +3553,48 @@ static BOOL lookup_is_glyph_match(const struct scriptshaping_context *context, u
return TRUE;
}
static BOOL glyph_iterator_match(const struct glyph_iterator *iter)
static enum iterator_match glyph_iterator_may_skip(const struct glyph_iterator *iter)
{
return lookup_is_glyph_match(iter->context, iter->pos, iter->flags);
if (!lookup_is_glyph_match(iter->context, iter->pos, iter->flags))
return ITER_YES;
return ITER_NO;
}
static enum iterator_match glyph_iterator_may_match(const struct glyph_iterator *iter)
{
if (!(iter->mask & iter->context->glyph_infos[iter->pos].mask))
return ITER_NO;
if (iter->match_func)
return !!iter->match_func(iter->context->u.buffer.glyphs[iter->pos], *iter->glyph_data, iter->match_data);
return ITER_MAYBE;
}
static BOOL glyph_iterator_next(struct glyph_iterator *iter)
{
enum iterator_match skip, match;
while (iter->pos + iter->len < iter->context->glyph_count)
{
++iter->pos;
if (glyph_iterator_match(iter))
skip = glyph_iterator_may_skip(iter);
if (skip == ITER_YES)
continue;
match = glyph_iterator_may_match(iter);
if (match == ITER_YES || (match == ITER_MAYBE && skip == ITER_NO))
{
--iter->len;
if (iter->glyph_data)
++iter->glyph_data;
return TRUE;
}
if (skip == ITER_NO)
return FALSE;
}
return FALSE;
@ -3557,17 +3602,27 @@ static BOOL glyph_iterator_next(struct glyph_iterator *iter)
static BOOL glyph_iterator_prev(struct glyph_iterator *iter)
{
if (!iter->pos)
return FALSE;
enum iterator_match skip, match;
while (iter->pos > iter->len - 1)
{
--iter->pos;
if (glyph_iterator_match(iter))
skip = glyph_iterator_may_skip(iter);
if (skip == ITER_YES)
continue;
match = glyph_iterator_may_match(iter);
if (match == ITER_YES || (match == ITER_MAYBE && skip == ITER_NO))
{
--iter->len;
if (iter->glyph_data)
++iter->glyph_data;
return TRUE;
}
if (skip == ITER_NO)
return FALSE;
}
return FALSE;