Add check if we can use dynamic session resize

When the server does not comply with our initial session size
request, we disable the dynamic session resize feature.

Co-authored-by: Henrik Andersson <hean01@cendio.com>
Co-authored-by: Karl Mikaelsson <derfian@cendio.se>

proto.h

@@ -264,6 +264,7 @@ void ui_deinit(void);
 RD_BOOL ui_create_window(uint32 width, uint32 height);
 void ui_resize_window(uint32 width, uint32 height);
 void ui_destroy_window(void);
+void ui_update_window_sizehints(uint32 width, uint32 height);
 RD_BOOL ui_have_window(void);
 void xwin_toggle_fullscreen(void);
 void ui_select(int rdp_socket);

rdp.c

@@ -54,6 +54,8 @@ extern struct timeval g_pending_resize_defer_timer;
 extern RD_BOOL g_network_error;
 extern time_t g_wait_for_deactivate_ts;
 
+extern RD_BOOL g_dynamic_session_resize;
+
 RD_BOOL g_exit_mainloop = False;
 
 uint8 *g_next_packet;
@@ -1102,10 +1104,13 @@ rdp_process_general_caps(STREAM s)
 		g_rdp_version = RDP_V4;
 }
 
+static RD_BOOL g_first_bitmap_caps = True;
+
 /* Process a bitmap capability set */
 static void
 rdp_process_bitmap_caps(STREAM s)
 {
+
 	uint16 depth;
 
 	logger(Protocol, Debug, "%s()", __func__);
@@ -1120,6 +1125,15 @@ rdp_process_bitmap_caps(STREAM s)
 	       "rdp_process_bitmap_caps(), setting desktop size and depth to: %dx%dx%d",
 	       g_session_width, g_session_height, depth);
 
+	/* Detect if we can have dynamic session resize enabled, only once. */
+	if (g_first_bitmap_caps == True && !(g_session_width == g_requested_session_width
+			      && g_session_height == g_requested_session_height))
+	{
+		logger(Core, Notice, "Disabling dynamic session resize");
+		g_dynamic_session_resize = False;
+	}
+	g_first_bitmap_caps = False;
+
 	/*
 	 * The server may limit depth and change the size of the desktop (for
 	 * example when shadowing another session).
@@ -1139,6 +1153,14 @@ rdp_process_bitmap_caps(STREAM s)
 	if (g_fullscreen == True)
 		return;
 
+	/* If dynamic session resize is disabled, set window size hints to
+	   fixed session size */
+	if (g_dynamic_session_resize == False)
+	{
+		ui_update_window_sizehints(g_session_width, g_session_height);
+		return;
+	}
+
 	ui_resize_window(g_session_width, g_session_height);
 }
 
@@ -1974,6 +1996,7 @@ rdp_reset_state(void)
 	g_next_packet = NULL;	/* reset the packet information */
 	g_rdp_shareid = 0;
 	g_exit_mainloop = False;
+	g_first_bitmap_caps = True;
 	sec_reset_state();
 }
 

xwin.c

@@ -77,6 +77,8 @@ static int g_x_socket;
 static Screen *g_screen;
 Window g_wnd;
 
+RD_BOOL g_dynamic_session_resize = True;
+
 /* These are the last known window sizes. They are updated whenever the window size is changed. */
 static uint32 g_window_width;
 static uint32 g_window_height;
@@ -2076,7 +2078,7 @@ get_sizehints(XSizeHints *sizehints, uint32 width, uint32 height)
 	sizehints->width_inc = 2; /* session width must be divisible by two */
 	sizehints->height_inc = 1;
 
-	if (g_seamless_rdp)
+	if (g_seamless_rdp || !g_dynamic_session_resize)
 	{
 		/* disable dynamic session resize based on window size for
 		   rdesktop main window when seamless is enabled */
@@ -2086,6 +2088,19 @@ get_sizehints(XSizeHints *sizehints, uint32 width, uint32 height)
 	}
 }
 
+void
+ui_update_window_sizehints(uint32 width, uint32 height)
+{
+	XSizeHints *sizehints;
+	sizehints = XAllocSizeHints();
+	if (sizehints)
+	{
+		get_sizehints(sizehints, width, height);
+		XSetWMNormalHints(g_display, g_wnd, sizehints);
+		XFree(sizehints);
+	}
+}
+
 RD_BOOL
 ui_create_window(uint32 width, uint32 height)
 {
@@ -3124,7 +3139,7 @@ ui_select(int rdp_socket)
 			continue;
 		}
 
-		if (g_pending_resize == True)
+		if (g_pending_resize == True && g_dynamic_session_resize)
 		{
 			/* returns True on disconnect-reconnect resize */
 			if (process_pending_resize() == True)