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[ot-font] Vertically center glyph in vertical writing fallback 

Fixes https://github.com/harfbuzz/harfbuzz/issues/537
This commit is contained in:
Behdad Esfahbod 2022-03-21 21:40:07 -06:00
parent bf03d7e962
commit 1449498e1d
1 changed files with 14 additions and 5 deletions
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19
src/hb-ot-font.cc
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@ -175,12 +175,21 @@ hb_ot_get_glyph_v_origin (hb_font_t *font,
}
hb_glyph_extents_t extents = {0};
if (ot_face->vmtx->has_data () &&
ot_face->glyf->get_extents (font, glyph, &extents))
if (ot_face->glyf->get_extents (font, glyph, &extents))
{
const OT::vmtx_accelerator_t &vmtx = *ot_face->vmtx;
hb_position_t tsb = vmtx.get_side_bearing (font, glyph);
*y = extents.y_bearing + font->em_scale_y (tsb);
if (ot_face->vmtx->has_data ())
{
const OT::vmtx_accelerator_t &vmtx = *ot_face->vmtx;
hb_position_t tsb = vmtx.get_side_bearing (font, glyph);
*y = extents.y_bearing + font->em_scale_y (tsb);
return true;
}
hb_font_extents_t font_extents;
font->get_h_extents_with_fallback (&font_extents);
hb_position_t advance = font_extents.ascender - font_extents.descender;
int diff = advance - -extents.height;
*y = extents.y_bearing + (diff >> 1);
return true;
}