[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.cc b/src/hb-buffer.cc
index c271086..764b8ed 100644
--- a/src/hb-buffer.cc
+++ b/src/hb-buffer.cc
@@ -798,6 +798,8 @@
free (buffer->info);
free (buffer->pos);
+ if (buffer->message_destroy)
+ buffer->message_destroy (buffer->message_data);
free (buffer);
}
@@ -1713,3 +1715,45 @@
}
}
}
+
+/*
+ * Debugging.
+ */
+
+/**
+ * hb_buffer_set_message_func:
+ * @buffer: a buffer.
+ * @func: (closure user_data) (destroy destroy) (scope notified):
+ * @user_data:
+ * @destroy:
+ *
+ *
+ *
+ * Since: 1.1.3
+ **/
+void
+hb_buffer_set_message_func (hb_buffer_t *buffer,
+ hb_buffer_message_func_t func,
+ void *user_data, hb_destroy_func_t destroy)
+{
+ if (buffer->message_destroy)
+ buffer->message_destroy (buffer->message_data);
+
+ if (func) {
+ buffer->message_func = func;
+ buffer->message_data = user_data;
+ buffer->message_destroy = destroy;
+ } else {
+ buffer->message_func = NULL;
+ buffer->message_data = NULL;
+ buffer->message_destroy = NULL;
+ }
+}
+
+bool
+hb_buffer_t::message_impl (hb_font_t *font, const char *fmt, va_list ap)
+{
+ char buf[100];
+ vsnprintf (buf, sizeof (buf), fmt, ap);
+ return (bool) this->message_func (this, font, buf, this->message_data);
+}
