[ot-layout] Synthesize missing baselines
Add a variation of hb_ot_layout_get_baseline that
synthesizes missing baselines, using heuristics in part
taken from the CSS Inline Layout Module, Level 3.
Includes some new tests for synthesized baselines.
The base2.ttf is a subset of Noto Sans Bengali that
includes just the Bengali Ka.
New API: hb_ot_layout_get_baseline_with_fallback
diff --git a/src/hb-ot-layout.h b/src/hb-ot-layout.h
index edbb7b8..22ba7c4 100644
--- a/src/hb-ot-layout.h
+++ b/src/hb-ot-layout.h
@@ -522,6 +522,14 @@
hb_tag_t language_tag,
hb_position_t *coord /* OUT. May be NULL. */);
+HB_EXTERN void
+hb_ot_layout_get_baseline_with_fallback (hb_font_t *font,
+ hb_ot_layout_baseline_tag_t baseline_tag,
+ hb_direction_t direction,
+ hb_tag_t script_tag,
+ hb_tag_t language_tag,
+ hb_position_t *coord /* OUT */);
+
HB_END_DECLS
#endif /* HB_OT_LAYOUT_H */
