New API: hb_buffer_[sg]et_replacement_codepoint()
With this change, we now by default replace broken UTF-8/16/32 bits
with U+FFFD. This can be changed by calling new API on the buffer.
Previously the replacement value used to be (hb_codepoint_t)-1.
Note that hb_buffer_clear_contents() does NOT reset the replacement
character.
See discussion here:
https://github.com/behdad/harfbuzz/commit/6f13b6d62daae4989e3cc2fe4b168e5c59650964
New API:
hb_buffer_set_replacement_codepoint()
hb_buffer_get_replacement_codepoint()
diff --git a/src/hb-buffer-private.hh b/src/hb-buffer-private.hh
index 3a2b9ab..5eccd3c 100644
--- a/src/hb-buffer-private.hh
+++ b/src/hb-buffer-private.hh
@@ -52,6 +52,7 @@
hb_unicode_funcs_t *unicode; /* Unicode functions */
hb_segment_properties_t props; /* Script, language, direction */
hb_buffer_flags_t flags; /* BOT / EOT / etc. */
+ hb_codepoint_t replacement; /* U+FFFD or something else. */
/* Buffer contents */
