add support for textareas, used for various dialog windows on the gui.

The main code to implement the textarea is in console_board.c,
and uses a simple png image with the font, blitting characters
on the designated areas of the main screen.
Additionally we provide some annotations in the image used
as a skin to indicate which areas are used for text messages.
(images will be committed separately).
At the moment the dialog area is only used to display a running
counter, just as a proof of concept.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@97280 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/console_video.c

@@ -659,6 +659,8 @@ static struct ast_frame *get_video_frames(struct video_desc *env, struct ast_fra
 	return v->enc->enc_encap(&v->enc_out, v->mtu, tail);
 }
 
+int print_message(struct board *b, const char *s);
+
 /*
  * Helper thread to periodically poll the video source and enqueue the
  * generated frames to the channel's queue.
@@ -715,6 +717,10 @@ static void *video_thread(void *arg)
 		int fd = chan->alertpipe[1];
 		char *caption = NULL, buf[160];
 
+		sprintf(buf, "%d   \r", count);
+		if (env->gui)
+			print_message(env->gui->bd_msg, buf);
+
 		/* determine if video format changed */
 		if (count++ % 10 == 0) {
 			if (env->out.sendvideo)