implement --transparency/-x at the command line

Closes #100

termite.1

@@ -25,6 +25,8 @@ Set the termite window's title to \fITITLE\fP. This disables dynamic
 titles.
 .IP "\fB\-c\fR, \fB\-\-config\fR\fB=\fR\fICONFIG\fR"
 Specify a path to an alternative config file to use.
+.IP "\fB\-x\fR, \fB\-\-transparency\fR\fB=\fR\fITRANSPARENCY\fR"
+Sets the inital Transparency.
 .IP "\fB\-\-geometry\fR\fB=\fR\fIGEOMETRY\fR"
 Override the window geometry in pixels.
 .IP "\fB\-\-display\fR\fB=\fR\fIDISPLAY\fR"

termite.cc

@@ -88,7 +88,7 @@ struct hint_info {
 struct config_info {
     hint_info hints;
     char *browser;
-    gboolean dynamic_title, urgent_on_bell, clickable_url;
+    gboolean dynamic_title, urgent_on_bell, clickable_url, opacity_set;
     int tag;
     char *config_file;
 };
@@ -105,7 +105,7 @@ struct draw_cb_info {
 };
 
 static void launch_browser(char *browser, char *url);
-
+static void set_opacity(GtkWidget *window, VteTerminal *vte, double opacity);
 static void window_title_cb(VteTerminal *vte, gboolean *dynamic_title);
 static gboolean key_press_cb(VteTerminal *vte, GdkEventKey *event, keybind_info *info);
 static gboolean entry_key_press_cb(GtkEntry *entry, GdkEventKey *event, keybind_info *info);
@@ -130,6 +130,27 @@ void launch_browser(char *browser, char *url) {
     g_spawn_async(nullptr, browser_cmd, nullptr, G_SPAWN_SEARCH_PATH, nullptr, nullptr, nullptr, nullptr);
 }
 
+static void set_opacity(GtkWidget *window, VteTerminal *vte, double opacity) {
+        vte_terminal_set_background_saturation(vte, opacity);
+        vte_terminal_set_background_transparent(vte, false);
+
+        GdkScreen *screen = gtk_widget_get_screen(GTK_WIDGET(window));
+        GdkVisual *visual;
+
+        if (opacity > 0.0 && (visual = gdk_screen_get_rgba_visual(screen))) {
+            vte_terminal_set_opacity(vte, (guint16)(0xffff * (1 - opacity)));
+        } else {
+            visual = gdk_screen_get_system_visual(screen);
+            vte_terminal_set_opacity(vte, G_MAXUINT16);
+        }
+        if (visual != gtk_widget_get_visual(GTK_WIDGET(window))) {
+            gtk_widget_set_visual(GTK_WIDGET(window), visual);
+
+            // TODO; need to make dynamic changes to the visual work
+            // the obvious way is simply to hide the window and the restore shown widgets
+        }
+}
+
 static void launch_in_directory(VteTerminal *vte) {
     const char *uri = vte_terminal_get_current_directory_uri(vte);
     if (!uri) {
@@ -1212,24 +1233,8 @@ static void set_config(GtkWindow *window, VteTerminal *vte, config_info *info,
     }
 
     if (auto opacity = get_config_double(config, "options", "transparency")) {
-        vte_terminal_set_background_saturation(vte, *opacity);
+        if (!info->opacity_set) {
-        gboolean pseudo = cfg_bool("pseudo_transparency", FALSE);
+            set_opacity(GTK_WIDGET(window), vte, *opacity);
-        vte_terminal_set_background_transparent(vte, pseudo);
-
-        GdkScreen *screen = gtk_widget_get_screen(GTK_WIDGET(window));
-        GdkVisual *visual;
-
-        if (*opacity > 0.0 && !pseudo && (visual = gdk_screen_get_rgba_visual(screen))) {
-            vte_terminal_set_opacity(vte, (guint16)(0xffff * (1 - *opacity)));
-        } else {
-            visual = gdk_screen_get_system_visual(screen);
-            vte_terminal_set_opacity(vte, G_MAXUINT16);
-        }
-        if (visual != gtk_widget_get_visual(GTK_WIDGET(window))) {
-            gtk_widget_set_visual(GTK_WIDGET(window), visual);
-
-            // TODO: need to make dynamic changes to the visual work
-            // the obvious way is simply to hide the window and then restore shown widgets
         }
     }
 
@@ -1251,6 +1256,7 @@ int main(int argc, char **argv) {
     GOptionContext *context = g_option_context_new(nullptr);
     char *role = nullptr, *geometry = nullptr, *execute = nullptr, *config_file = nullptr;
     char *title = nullptr;
+    double trans = 0.0;
     const GOptionEntry entries[] = {
         {"role", 'r', 0, G_OPTION_ARG_STRING, &role, "The role to use", "ROLE"},
         {"geometry", 0, 0, G_OPTION_ARG_STRING, &geometry, "Window geometry", "GEOMETRY"},
@@ -1260,6 +1266,7 @@ int main(int argc, char **argv) {
         {"version", 'v', 0, G_OPTION_ARG_NONE, &version, "Version info", nullptr},
         {"hold", 0, 0, G_OPTION_ARG_NONE, &hold, "Remain open after child process exits", nullptr},
         {"config", 'c', 0, G_OPTION_ARG_STRING, &config_file, "Path of config file", "CONFIG"},
+        {"transparency", 'x', 0, G_OPTION_ARG_DOUBLE, &trans, "Initial transparency", "TRANSPARENCY"},
         {}
     };
     g_option_context_add_main_entries(context, entries, nullptr);
@@ -1330,7 +1337,7 @@ int main(int argc, char **argv) {
          nullptr},
         {vi_mode::insert, 0, 0, 0, 0},
         {{nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, 0, 0, 0},
-         nullptr, FALSE, FALSE, FALSE, -1, config_file}
+         nullptr, FALSE, FALSE, FALSE, FALSE, -1, config_file}
     };
 
     load_config(GTK_WINDOW(window), vte, &info.config, geometry ? nullptr : &geometry);
@@ -1392,6 +1399,11 @@ int main(int argc, char **argv) {
         g_free(geometry);
     }
 
+    if (trans) {
+        info.config.opacity_set = true;
+        set_opacity(GTK_WIDGET(window), vte, trans);
+    }
+
     gtk_widget_grab_focus(vte_widget);
     gtk_widget_show_all(window);
     gtk_widget_hide(info.panel.panel);