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If variation selector is not consumed by cmap, pass it on to GSUB 

This changes the semantics of get_glyph() callback and expect that
callbacks return false if the requested variant is not available, and
then we will call them back with variation_selector=0 and will retain
the glyph for the selector in the glyph stream.

Apparently most Mongolian fonts implement the Mongolian Variation
Selectors using GSUB, not cmap.

https://bugs.freedesktop.org/show_bug.cgi?id=65258

Note that this doesn't fix the Mongolian shaping yet, because the way
that's implemented is that the, say, 'init' feature ligates the letter
and the variation-selector.  However, since currently the variation
selector doesn't have the 'init' mask on, it will not be matched...
This commit is contained in:
Behdad Esfahbod 2013-06-13 19:01:07 -04:00
parent c7a8491720
commit 79d1007a50
2 changed files with 13 additions and 4 deletions
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3
src/hb-ft.cc
View File

@ -73,8 +73,7 @@ hb_ft_get_glyph (hb_font_t *font HB_UNUSED,
#ifdef HAVE_FT_FACE_GETCHARVARIANTINDEX
if (unlikely (variation_selector)) {
*glyph = FT_Face_GetCharVariantIndex (ft_face, unicode, variation_selector);
if (*glyph)
return true;
return *glyph != 0;
}
#endif

14
src/hb-ot-shape-normalize.cc
View File

@ -217,8 +217,18 @@ handle_variation_selector_cluster (const hb_ot_shape_normalize_context_t *c, uns
for (; buffer->idx < end - 1;) {
if (unlikely (buffer->unicode->is_variation_selector (buffer->cur(+1).codepoint))) {
/* The next two lines are some ugly lines... But work. */
c->font->get_glyph (buffer->cur().codepoint, buffer->cur(+1).codepoint, &buffer->cur().glyph_index());
buffer->replace_glyphs (2, 1, &buffer->cur().codepoint);
if (c->font->get_glyph (buffer->cur().codepoint, buffer->cur(+1).codepoint, &buffer->cur().glyph_index()))
{
buffer->replace_glyphs (2, 1, &buffer->cur().codepoint);
}
else
{
/* Just pass on the two characters separately, let GSUB do its magic. */
set_glyph (buffer->cur(), c->font);
buffer->next_glyph ();
set_glyph (buffer->cur(), c->font);
buffer->next_glyph ();
}
/* Skip any further variation selectors. */
while (buffer->idx < end && unlikely (buffer->unicode->is_variation_selector (buffer->cur().codepoint)))
{