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Simplify get_glyph_alternates() dispatcher 

Trying to make it **very simple** to add a specialized dispatcher for
one API to be routed to just a few objects (one in this case).
This commit is contained in:
Behdad Esfahbod 2020-06-18 16:41:31 -07:00
parent ffe8d3f39d
commit b2a1acccd9
3 changed files with 36 additions and 45 deletions
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9
src/hb-ot-layout-gsub-table.hh
View File

@ -643,9 +643,12 @@ struct AlternateSubstFormat1
{ return c->len == 1 && (this+coverage).get_coverage (c->glyphs[0]) != NOT_COVERED; }
unsigned
get_glyph_alternates (hb_get_glyph_alternates_context_t *c) const
{ return (this+alternateSet[(this+coverage).get_coverage (c->gid)])
.get_alternates (c->start_offset, c->alternate_count, c->alternate_glyphs); }
get_glyph_alternates (hb_codepoint_t gid,
unsigned start_offset,
unsigned *alternate_count /* IN/OUT. May be NULL. */,
hb_codepoint_t *alternate_glyphs /* OUT. May be NULL. */) const
{ return (this+alternateSet[(this+coverage).get_coverage (gid)])
.get_alternates (start_offset, alternate_count, alternate_glyphs); }
bool apply (hb_ot_apply_context_t *c) const
{

40
src/hb-ot-layout-gsubgpos.hh
View File

@ -227,46 +227,6 @@ struct hb_would_apply_context_t :
debug_depth (0) {}
};
struct hb_get_glyph_alternates_context_t :
hb_dispatch_context_t<hb_get_glyph_alternates_context_t, unsigned, 0>
{
const char *get_name () { return "GET_GLYPH_ALTERNATES"; }
static return_t default_return_value () { return 0; }
bool stop_sublookup_iteration (return_t r) const { return r; }
hb_face_t *face;
hb_codepoint_t gid;
unsigned start_offset;
unsigned *alternate_count;
hb_codepoint_t *alternate_glyphs;
unsigned int debug_depth;
hb_get_glyph_alternates_context_t (hb_face_t *face_,
hb_codepoint_t gid_,
unsigned start_offset_,
unsigned *alternate_count_,
hb_codepoint_t *alternate_glyphs_) :
face (face_),
gid (gid_),
start_offset (start_offset_),
alternate_count (alternate_count_),
alternate_glyphs (alternate_glyphs_),
debug_depth (0) {}
private:
template <typename T> auto
_dispatch (const T &obj, hb_priority<1>) HB_AUTO_RETURN
( obj.get_glyph_alternates (this) )
template <typename T> auto
_dispatch (const T &obj, hb_priority<0>) HB_AUTO_RETURN
( default_return_value () )
public:
template <typename T> auto
dispatch (const T &obj) HB_AUTO_RETURN
( _dispatch (obj, hb_prioritize) )
};
struct hb_collect_glyphs_context_t :
hb_dispatch_context_t<hb_collect_glyphs_context_t, hb_empty_t, 0>
{

32
src/hb-ot-layout.cc
View File

@ -1969,6 +1969,34 @@ hb_ot_layout_get_baseline (hb_font_t *font,
}
#endif
struct hb_get_glyph_alternates_context_t :
hb_dispatch_context_t<hb_get_glyph_alternates_context_t, unsigned, 0>
{
const char *get_name () { return "GET_GLYPH_ALTERNATES"; }
static return_t default_return_value () { return 0; }
bool stop_sublookup_iteration (return_t r) const { return r; }
hb_face_t *face;
unsigned int debug_depth;
hb_get_glyph_alternates_context_t (hb_face_t *face) :
face (face),
debug_depth (0) {}
private:
template <typename T, typename ...Ts> auto
_dispatch (const T &obj, hb_priority<1>, Ts&&... ds) HB_AUTO_RETURN
( obj.get_glyph_alternates (hb_forward<Ts> (ds)...) )
template <typename T, typename ...Ts> auto
_dispatch (const T &obj, hb_priority<0>, Ts&&... ds) HB_AUTO_RETURN
( default_return_value () )
public:
template <typename T, typename ...Ts> auto
dispatch (const T &obj, Ts&&... ds) HB_AUTO_RETURN
( _dispatch (obj, hb_prioritize, hb_forward<Ts> (ds)...) )
};
/**
* hb_ot_layout_lookup_get_glyph_alternates:
* @face: a face.
@ -1994,9 +2022,9 @@ hb_ot_layout_lookup_get_glyph_alternates (hb_face_t *face,
unsigned *alternate_count /* IN/OUT. May be NULL. */,
hb_codepoint_t *alternate_glyphs /* OUT. May be NULL. */)
{
OT::hb_get_glyph_alternates_context_t c (face, glyph, start_offset, alternate_count, alternate_glyphs);
hb_get_glyph_alternates_context_t c (face);
const OT::SubstLookup &lookup = face->table.GSUB->table->get_lookup (lookup_index);
auto ret = lookup.dispatch (&c);
auto ret = lookup.dispatch (&c, glyph, start_offset, alternate_count, alternate_glyphs);
if (!ret && alternate_count) *alternate_count = 0;
return ret;
}