[buffer] Add debugging, aka, message, API
Currently just announces lookup applications. Message-API *will* change.
hb-shape / hb-view are updated to print-out messages to stder if --debug
is specified.
diff --git a/src/hb-buffer-private.hh b/src/hb-buffer-private.hh
index 111078c..4983f84 100644
--- a/src/hb-buffer-private.hh
+++ b/src/hb-buffer-private.hh
@@ -124,6 +124,11 @@
hb_codepoint_t context[2][CONTEXT_LENGTH];
unsigned int context_len[2];
+ /* Debugging */
+ hb_buffer_message_func_t message_func;
+ void *message_data;
+ hb_destroy_func_t message_destroy;
+
/* Methods */
@@ -233,6 +238,19 @@
inline void clear_context (unsigned int side) { context_len[side] = 0; }
HB_INTERNAL void sort (unsigned int start, unsigned int end, int(*compar)(const hb_glyph_info_t *, const hb_glyph_info_t *));
+
+ inline bool messaging (void) { return unlikely (message_func); }
+ inline bool message (hb_font_t *font, const char *fmt, ...) HB_PRINTF_FUNC(3, 4)
+ {
+ if (!messaging ())
+ return true;
+ va_list ap;
+ va_start (ap, fmt);
+ bool ret = message_impl (font, fmt, ap);
+ va_end (ap);
+ return ret;
+ }
+ HB_INTERNAL bool message_impl (hb_font_t *font, const char *fmt, va_list ap) HB_PRINTF_FUNC(3, 0);
};
