GUAC-835: Add support for all RDP performance flags.

src/protocols/rdp/client.c

@@ -116,6 +116,12 @@ const char* GUAC_CLIENT_ARGS[] = {
     "remote-app-args",
     "static-channels",
     "client-name",
+    "enable-wallpaper",
+    "enable-theming",
+    "enable-font-smoothing",
+    "enable-full-window-drag",
+    "enable-desktop-composition",
+    "enable-menu-animations",
     NULL
 };
 
@@ -146,6 +152,12 @@ enum RDP_ARGS_IDX {
     IDX_REMOTE_APP_ARGS,
     IDX_STATIC_CHANNELS,
     IDX_CLIENT_NAME,
+    IDX_ENABLE_WALLPAPER,
+    IDX_ENABLE_THEMING,
+    IDX_ENABLE_FONT_SMOOTHING,
+    IDX_ENABLE_FULL_WINDOW_DRAG,
+    IDX_ENABLE_DESKTOP_COMPOSITION,
+    IDX_ENABLE_MENU_ANIMATIONS,
     RDP_ARGS_COUNT
 };
 
@@ -698,6 +710,14 @@ int guac_client_init(guac_client* client, int argc, char** argv) {
     if (argv[IDX_STATIC_CHANNELS][0] != '\0')
         settings->svc_names = guac_split(argv[IDX_STATIC_CHANNELS], ',');
 
+    /* Performance flags */
+    settings->wallpaper_enabled           = (strcmp(argv[IDX_ENABLE_WALLPAPER],           "true") == 0);
+    settings->theming_enabled             = (strcmp(argv[IDX_ENABLE_THEMING],             "true") == 0);
+    settings->font_smoothing_enabled      = (strcmp(argv[IDX_ENABLE_FONT_SMOOTHING],      "true") == 0);
+    settings->full_window_drag_enabled    = (strcmp(argv[IDX_ENABLE_FULL_WINDOW_DRAG],    "true") == 0);
+    settings->desktop_composition_enabled = (strcmp(argv[IDX_ENABLE_DESKTOP_COMPOSITION], "true") == 0);
+    settings->menu_animations_enabled     = (strcmp(argv[IDX_ENABLE_MENU_ANIMATIONS],     "true") == 0);
+
     /* Session color depth */
     settings->color_depth = RDP_DEFAULT_DEPTH;
     if (argv[IDX_COLOR_DEPTH][0] != '\0')

src/protocols/rdp/rdp_settings.c

@@ -25,6 +25,7 @@
 #include "rdp_settings.h"
 
 #include <freerdp/constants.h>
+#include <freerdp/settings.h>
 
 #ifdef ENABLE_WINPR
 #include <winpr/wtypes.h>
@@ -59,6 +60,51 @@ int guac_rdp_get_depth(freerdp* rdp) {
 #endif
 }
 
+/**
+ * Given the settings structure of the Guacamole RDP client, calculates the
+ * standard performance flag value to send to the RDP server. The value of
+ * these flags is dictated by the RDP standard.
+ *
+ * @param guac_settings
+ *     The settings structure to read performance settings from.
+ *
+ * @returns
+ *     The standard RDP performance flag value representing the union of all
+ *     performance settings within the given settings structure.
+ */
+static int guac_rdp_get_performance_flags(guac_rdp_settings* guac_settings) {
+
+    /* No performance flags initially */
+    int flags = PERF_FLAG_NONE;
+
+    /* Desktop wallpaper */
+    if (!guac_settings->wallpaper_enabled)
+        flags |= PERF_DISABLE_WALLPAPER;
+
+    /* Theming of desktop/windows */
+    if (!guac_settings->theming_enabled)
+        flags |= PERF_DISABLE_THEMING;
+
+    /* Font smoothing (ClearType) */
+    if (guac_settings->font_smoothing_enabled)
+        flags |= PERF_ENABLE_FONT_SMOOTHING;
+
+    /* Full-window drag */
+    if (!guac_settings->full_window_drag_enabled)
+        flags |= PERF_DISABLE_FULLWINDOWDRAG;
+
+    /* Desktop composition (Aero) */
+    if (guac_settings->desktop_composition_enabled)
+        flags |= PERF_ENABLE_DESKTOP_COMPOSITION;
+
+    /* Menu animations */
+    if (!guac_settings->menu_animations_enabled)
+        flags |= PERF_DISABLE_MENUANIMATIONS;
+
+    return flags;
+
+}
+
 void guac_rdp_push_settings(guac_rdp_settings* guac_settings, freerdp* rdp) {
 
     BOOL bitmap_cache;
@@ -99,6 +145,13 @@ void guac_rdp_push_settings(guac_rdp_settings* guac_settings, freerdp* rdp) {
     rdp_settings->KeyboardLayout = guac_settings->server_layout->freerdp_keyboard_layout;
 #endif
 
+    /* Performance flags */
+#ifdef LEGACY_RDPSETTINGS
+    rdp_settings->performance_flags = guac_rdp_get_performance_flags(guac_settings);
+#else
+    rdp_settings->PerformanceFlags = guac_rdp_get_performance_flags(guac_settings);
+#endif
+
     /* Client name */
     if (guac_settings->client_name != NULL) {
 #ifdef LEGACY_RDPSETTINGS

src/protocols/rdp/rdp_settings.h

@@ -219,6 +219,47 @@ typedef struct guac_rdp_settings {
      */
     char** svc_names;
 
+    /**
+     * Whether the desktop wallpaper should be visible. If unset, the desktop
+     * wallpaper will be hidden, reducing the amount of bandwidth required.
+     */
+    int wallpaper_enabled;
+
+    /**
+     * Whether desktop and window theming should be allowed. If unset, theming
+     * is temporarily disabled on the desktop of the RDP server for the sake of
+     * performance, reducing the amount of bandwidth required.
+     */
+    int theming_enabled;
+
+    /**
+     * Whether glyphs should be smoothed with antialiasing (ClearType). If
+     * unset, glyphs will be rendered with sharp edges and using single colors,
+     * effectively 1-bit images, reducing the amount of bandwidth required.
+     */
+    int font_smoothing_enabled;
+
+    /**
+     * Whether windows contents should be shown as they are moved. If unset,
+     * only a window border will be shown during window move operations,
+     * reducing the amount of bandwidth required.
+     */
+    int full_window_drag_enabled;
+
+    /**
+     * Whether desktop composition (Aero) should be enabled during the session.
+     * As desktop composition provides alpha blending and other special
+     * effects, this increases the amount of bandwidth used. If unset, desktop
+     * composition will be disabled.
+     */
+    int desktop_composition_enabled;
+
+    /**
+     * Whether menu animations should be shown. If unset, menus will not be
+     * animated, reducing the amount of bandwidth required.
+     */
+    int menu_animations_enabled;
+
 } guac_rdp_settings;
 
 /**