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[VarC/subset] Support subsetting VarComposites 

By renumbering components.
This commit is contained in:
Behdad Esfahbod 2023-04-20 17:31:58 -06:00
parent 15d0a1dcfd
commit f2d21425a3
2 changed files with 21 additions and 2 deletions
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15
src/OT/glyf/SubsetGlyph.hh
View File

@ -46,19 +46,30 @@ struct SubsetGlyph
if (unlikely (!dest_glyph.length)) return_trace (true);
/* update components gids. TODO: VarComposite. */
/* update components gids. */
for (auto &_ : Glyph (dest_glyph).get_composite_iterator ())
{
hb_codepoint_t new_gid;
if (plan->new_gid_for_old_gid (_.get_gid(), &new_gid))
const_cast<CompositeGlyphRecord &> (_).set_gid (new_gid);
}
#ifndef HB_NO_VAR_COMPOSITES
for (auto &_ : Glyph (dest_glyph).get_var_composite_iterator ())
{
hb_codepoint_t new_gid;
if (plan->new_gid_for_old_gid (_.get_gid(), &new_gid))
const_cast<VarCompositeGlyphRecord &> (_).set_gid (new_gid);
}
#endif
#ifndef HB_NO_BEYOND_64K
auto it = Glyph (dest_glyph).get_composite_iterator ();
if (it)
{
/* lower GID24 to GID16 in components if possible. TODO: VarComposite. */
/* lower GID24 to GID16 in components if possible.
*
* TODO: VarComposite. Not as critical, since VarComposite supports
* gid24 from the first version. */
char *p = it ? (char *) &*it : nullptr;
char *q = p;
const char *end = dest_glyph.arrayZ + dest_glyph.length;

8
src/OT/glyf/VarCompositeGlyph.hh
View File

@ -71,6 +71,14 @@ struct VarCompositeGlyphRecord
return StructAfter<const HBGlyphID16> (numAxes);
}
void set_gid (hb_codepoint_t gid)
{
if (flags & GID_IS_24BIT)
StructAfter<HBGlyphID24> (numAxes) = gid;
else
StructAfter<HBGlyphID16> (numAxes) = gid;
}
unsigned get_numAxes () const
{
return numAxes;