x11vnc: lower waitms and defer if framebuffer reads are fast (> 100MB/s)

x11vnc/options.c

@@ -353,6 +353,7 @@ int flip_byte_order = 0;	/* sometimes needed when using_shm = 0 */
  * poll times of 10-35ms, so maybe this value cuts the idle load by 2 or so.
  */
 int waitms = 20;
+int got_waitms = 0;
 double wait_ui = 2.0;
 double slow_fb = 0.0;
 double xrefresh = 0.0;

x11vnc/options.h

@@ -258,6 +258,7 @@ extern int tile_shm_count;
 extern int using_shm;
 extern int flip_byte_order;
 extern int waitms;
+extern int got_waitms;
 extern double wait_ui;
 extern double slow_fb;
 extern double xrefresh;

x11vnc/x11vnc.1

 .\" This file was automatically generated from x11vnc -help output.
-.TH X11VNC "1" "May 2008" "x11vnc " "User Commands"
+.TH X11VNC "1" "June 2008" "x11vnc " "User Commands"
 .SH NAME
 x11vnc - allow VNC connections to real X11 displays
-         version: 0.9.4, lastmod: 2008-05-31
+         version: 0.9.4, lastmod: 2008-06-01
 .SH SYNOPSIS
 .B x11vnc
 [OPTION]...

x11vnc/x11vnc.c

@@ -3222,6 +3222,7 @@ int main(int argc, char* argv[]) {
 		} else if (!strcmp(arg, "-wait")) {
 			CHECK_ARGC
 			waitms = atoi(argv[++i]);
+			got_waitms = 1;
 		} else if (!strcmp(arg, "-wait_ui")) {
 			CHECK_ARGC
 			wait_ui = atof(argv[++i]);
@@ -4782,6 +4783,28 @@ if (0) fprintf(stderr, "XA: %s\n", getenv("XAUTHORITY"));
 
 	initialize_speeds();
 
+	if (speeds_read_rate_measured > 100) {
+		/* framebuffer read is fast at  > 100 MB/sec */
+		if (! got_waitms) {
+			waitms /= 2;
+			if (waitms < 10) {
+				waitms = 10;
+			}
+			if (!quiet) {
+				rfbLog("fast read: reset wait  ms to: %d\n", waitms);
+			}
+		}
+		if (! got_deferupdate && ! got_defer) {
+			if (defer_update > 15) {
+				defer_update = 15;
+				if (screen) {
+					screen->deferUpdateTime = defer_update;
+				}
+				rfbLog("fast read: reset defer ms to: %d\n", defer_update);
+			}
+		}
+	}
+
 	initialize_keyboard_and_pointer();
 
 	if (inetd && use_openssl) {

x11vnc/x11vnc_defs.c

@@ -15,7 +15,7 @@ int xtrap_base_event_type = 0;
 int xdamage_base_event_type = 0;
 
 /*               date +'lastmod: %Y-%m-%d' */
-char lastmod[] = "0.9.4 lastmod: 2008-05-31";
+char lastmod[] = "0.9.4 lastmod: 2008-06-01";
 
 /* X display info */