Save a few X11 server roundtrips by ignoring empty damage regions.
Logging revealed that a few empty damage regions are emitted on startup. Those don't need to be rendered to the Surface pixmap.
diff --git a/vncviewer/PlatformPixelBuffer.cxx b/vncviewer/PlatformPixelBuffer.cxx
index be6f704..1e9803e 100644
--- a/vncviewer/PlatformPixelBuffer.cxx
+++ b/vncviewer/PlatformPixelBuffer.cxx
@@ -104,6 +104,9 @@
mutex.unlock();
#if !defined(WIN32) && !defined(__APPLE__)
+ if (r.width() == 0 || r.height() == 0)
+ return r;
+
GC gc;
gc = XCreateGC(fl_display, pixmap, 0, NULL);