From 8aa6fb9523957c7f4a3f14fb2c90ea9f9292a41f Mon Sep 17 00:00:00 2001
From: runge <runge>
Date: Sun, 17 Dec 2006 23:34:25 +0000
Subject: x11vnc: first pass at client-side caching, -ncache option.

---
 x11vnc/scan.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'x11vnc/scan.c')

diff --git a/x11vnc/scan.c b/x11vnc/scan.c
index 7a8272c..6ad2402 100644
--- a/x11vnc/scan.c
+++ b/x11vnc/scan.c
@@ -2816,6 +2816,31 @@ static int scan_display(int ystart, int rescan) {
 
 		/* grab the horizontal scanline from the display: */
 		X_LOCK;
+
+#ifndef NO_NCACHE
+#if !NO_X11
+if (ncache > 0 && dpy) {
+	/* XXX watch for problems. */
+	XEvent ev;
+	int gotone = 0;
+	if (XCheckTypedEvent(dpy, MapNotify, &ev)) {
+		gotone = 1;
+	} else if (XCheckTypedEvent(dpy, UnmapNotify, &ev)) {
+		gotone = 2;
+	} else if (XCheckTypedEvent(dpy, CreateNotify, &ev)) {
+		gotone = 3;
+	}
+	if (gotone) {
+		XPutBackEvent(dpy, &ev);
+		X_UNLOCK;
+fprintf(stderr, "*** SCAN_DISPLAY CHECK_NCACHE/%d *** %d\n", gotone, y);
+		check_ncache(0);
+		X_LOCK;
+	}
+}
+#endif
+#endif
+
 		XRANDR_SET_TRAP_RET(-1, "scan_display-set");
 		copy_image(scanline, 0, y, 0, 0);
 		XRANDR_CHK_TRAP_RET(-1, "scan_display-chk");
-- 
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