GUACAMOLE-1196: Remove unnecessary display size checking for VNC.

src/protocols/vnc/client.c

@@ -108,7 +108,6 @@ int guac_client_init(guac_client* client) {
 
 #ifdef ENABLE_VNC_DESKTOP_SIZE
     guac_client_log(client, GUAC_LOG_DEBUG, "Support for desktop sizing enabled.");
-    vnc_client->vnc_display = guac_vnc_display_update_alloc(client);
 #else
     guac_client_log(client, GUAC_LOG_WARNING, "VNC client does not support desktop sizing.");
 #endif
@@ -222,10 +221,6 @@ int guac_vnc_client_free_handler(guac_client* client) {
     /* Clean up the message lock. */
     pthread_mutex_destroy(&(vnc_client->message_lock));
 
-#ifdef ENABLE_VNC_DESKTOP_SIZE
-    guac_vnc_display_update_free(vnc_client->vnc_display);
-#endif
-
     /* Free generic data struct */
     guac_mem_free(client->data);
 

src/protocols/vnc/display.c

@@ -157,89 +157,26 @@ void guac_vnc_copyrect(rfbClient* client, int src_x, int src_y, int w, int h, in
 
 #ifdef ENABLE_VNC_DESKTOP_SIZE
 
-guac_vnc_display* guac_vnc_display_update_alloc(guac_client* client) {
+void guac_vnc_display_set_size(rfbClient* client, int width, int height) {
 
-    guac_vnc_display* display = guac_mem_alloc(sizeof(guac_vnc_display));
-    display->client = client;
-
-    /* No requests have been made */
-    display->last_request = guac_timestamp_current();
-    display->requested_width  = 0;
-    display->requested_height = 0;
-
-    return display;
-
-}
-
-void guac_vnc_display_update_free(guac_vnc_display* display) {
-    guac_mem_free(display);
-}
-
-/**
- * This function does the actual work of updating the display size if adequate
- * time has passed since the last update and the size is actually different.
-*
- * @param display
- *     The data structure that contains information used for determing if and
- *     when display updates should be allowed.
- *
- * @param rfb_client
- *     A pointer to the VNC (RFB) client.
- */
-static void guac_vnc_display_update_size(guac_vnc_display* display,
-        rfbClient* rfb_client) {
-
-    int width = display->requested_width;
-    int height = display->requested_height;
-
-    /* Do not update size if no requests have been received */
-    if (width == 0 || height == 0)
-        return;
-
-    guac_timestamp now = guac_timestamp_current();
-
-    /* Limit display update frequency */
-    if (now - display->last_request <= GUAC_COMMON_DISPLAY_UPDATE_INTERVAL)
-        return;
-
-    /* Do NOT send requests unless the size will change */
-    if (rfb_client != NULL
-            && width == rfb_client->screen.width
-            && height == rfb_client->screen.height)
-        return;
-
-    /* Send the display size update. */
-    guac_vnc_client* vnc_client = (guac_vnc_client*) display->client->data;
-    pthread_mutex_lock(&(vnc_client->message_lock));
-    SendExtDesktopSize(rfb_client, width, height);
-    display->last_request = now;
-    pthread_mutex_unlock(&(vnc_client->message_lock));
-
-}
-
-void guac_vnc_display_set_size(guac_vnc_display* display,
-        rfbClient* rfb_client, int width, int height) {
+    /* Get the VNC client */
+    guac_client* gc = rfbClientGetClientData(client, GUAC_VNC_CLIENT_KEY);
+    guac_vnc_client* vnc_client = (guac_vnc_client*) gc->data;
 
     /* Fit width within bounds, adjusting height to maintain aspect ratio */
     guac_common_display_fit(&width, &height);
 
     /* Fit height within bounds, adjusting width to maintain aspect ratio */
     guac_common_display_fit(&height, &width);
 
-    /* Width must be even */
-    if (width % 2 == 1)
-        width -= 1;
-
-    /* Store deferred size */
-    display->requested_width = width;
-    display->requested_height = height;
-
-    /* Send display update notification if possible */
-    guac_vnc_display_update_size(display, rfb_client);
+    /* Send the display size update. */
+    pthread_mutex_lock(&(vnc_client->message_lock));
+    SendExtDesktopSize(client, width, height);
+    pthread_mutex_unlock(&(vnc_client->message_lock));
 
 }
 
-#endif
+#endif // ENABLE_VNC_DESKTOP_SIZE
 
 void guac_vnc_set_pixel_format(rfbClient* client, int color_depth) {
     client->format.trueColour = 1;

src/protocols/vnc/display.h

@@ -25,34 +25,6 @@
 #include <rfb/rfbclient.h>
 #include <rfb/rfbproto.h>
 
-/**
- * Display size update module for VNC.
- */
-typedef struct guac_vnc_display {
-
-    /**
-     * The guac_client instance handling the relevant VNC connection.
-     */
-    guac_client* client;
-
-    /**
-     * The timestamp of the last display update request, or 0 if no request
-     * has been sent yet.
-     */
-    guac_timestamp last_request;
-
-    /**
-     * The last requested screen width, in pixels.
-     */
-    int requested_width;
-
-    /**
-     * The last requested screen height, in pixels.
-     */
-    int requested_height;
-
-} guac_vnc_display;
-
 /**
  * Callback invoked by libVNCServer when it receives a new binary image data
  * from the VNC server. The image itself will be stored in the designated sub-
@@ -114,53 +86,23 @@ void guac_vnc_copyrect(rfbClient* client, int src_x, int src_y, int w, int h,
 
 #ifdef ENABLE_VNC_DESKTOP_SIZE
 
-/**
- * Allocates a new VNC display update module, which will keep track of the data
- * needed to handle display updates.
- *
- * @param client
- *     The guac_client instance handling the relevant VNC connection.
- *
- * @return
- *     A newly-allocated VNC display update module.
- */
-guac_vnc_display* guac_vnc_display_update_alloc(guac_client* client);
-
-/**
- * Frees the resources associated with the data structure that keeps track of
- * items related to VNC display updates. Only resources specific to Guacamole
- * are freed. Resources that are part of the rfbClient will be freed separately.
- * If no resources are currently allocated for Display Update support, this
- * function has no effect.
- *
- * @param display
- *     The display update module to free.
- */
-void guac_vnc_display_update_free(guac_vnc_display* display);
-
 /**
  * Attempts to set the display size of the remote server to the size requested
  * by the client, usually as part of a client (browser) resize, if supported by
  * both the VNC client and the remote server.
  *
  * @param display
- *     The VNC display update object that tracks information related to display
- *     update requests.
- *
- * @param rfb_client
- *     The data structure containing the VNC client that is used by this
- *     connection.
+ *     The VNC client to which the display size update should be sent.
  *
  * @param width
  *     The width that is being requested, in pixels.
  *
  * @param height
  *     The height that is being requested, in pixels.
  */
-void guac_vnc_display_set_size(guac_vnc_display* display, rfbClient* rfb_client,
-        int width, int height);
+void guac_vnc_display_set_size(rfbClient* client, int width, int height);
 
-#endif
+#endif // ENABLE_VNC_DESKTOP_SIZE
 
 /**
  * Sets the pixel format to request of the VNC server. The request will be made

src/protocols/vnc/input.c

@@ -69,14 +69,14 @@ int guac_vnc_user_key_handler(guac_user* user, int keysym, int pressed) {
 
 int guac_vnc_user_size_handler(guac_user* user, int width, int height) {
 
+    /* Get the Guacamole VNC client */
     guac_vnc_client* vnc_client = (guac_vnc_client*) user->client->data;
-    rfbClient* rfb_client = vnc_client->rfb_client;
 
     /* Send display update */
-    guac_vnc_display_set_size(vnc_client->vnc_display, rfb_client, width, height);
+    guac_vnc_display_set_size(vnc_client->rfb_client, width, height);
 
     return 0;
 
 }
 
-#endif
+#endif // ENABLE_VNC_DESKTOP_SIZE

src/protocols/vnc/vnc.h

@@ -141,11 +141,6 @@ typedef struct guac_vnc_client {
      */
     guac_iconv_write* clipboard_writer;
 
-    /**
-     * VNC display update module.
-     */
-    guac_vnc_display* vnc_display;
-
 } guac_vnc_client;
 
 /**