Alternative splash screen remaining clock

A simpler way than the svg and also highly portable would be an implementation via cairo as we do for
other "icons".

src/dtgtk/paint.c

@@ -1396,6 +1396,31 @@ void dtgtk_cairo_paint_color_harmony(cairo_t *cr, gint x, gint y, gint w, gint h
   FINISH
 }
 
+void dtgtk_cairo_paint_clock(cairo_t *cr, gint x, gint y, gint w, gint h, gint flags, void *data)
+{
+  PREAMBLE(1.2, 1.2, 0.5, 0.5)
+
+  static int clock = 0;
+
+  cairo_arc(cr, .0, .0, 0.5, 0, 2 * M_PI);
+  cairo_stroke(cr);
+
+  for(int i = 0; i < 12; i++)
+  {
+    cairo_arc(cr, .0, .35, i % 3 ? .03 : .05, 0, 2 * M_PI);
+    cairo_fill(cr);
+    cairo_rotate(cr, M_PI / 6);
+  }
+  cairo_rotate(cr, M_PI / 6 * clock++);
+  cairo_move_to(cr, 0.075, 0.0);
+  cairo_line_to(cr, 0.0, 0.4);
+  cairo_line_to(cr, -0.075, 0.0);
+  cairo_line_to(cr, 0.0, -0.05);
+  cairo_fill(cr);
+
+  FINISH
+}
+
 void dtgtk_cairo_paint_filmstrip(cairo_t *cr, gint x, gint y, gint w, gint h, gint flags, void *data)
 {
   const double sw = 0.6;

src/dtgtk/paint.h

@@ -231,6 +231,8 @@ void dtgtk_cairo_paint_jzazbz(cairo_t *cr, gint x, gint y, gint w, gint h, gint
 void dtgtk_cairo_paint_ryb(cairo_t *cr, gint x, gint y, gint w, gint h, gint flags, void *data);
 /** paint color harmony icon */
 void dtgtk_cairo_paint_color_harmony(cairo_t *cr, gint x, gint y, gint w, gint h, gint flags, void *data);
+/** paint moving clock */
+void dtgtk_cairo_paint_clock(cairo_t *cr, gint x, gint y, gint w, gint h, gint flags, void *data);
 
 /** paint active modulegroup icon */
 void dtgtk_cairo_paint_modulegroup_active(cairo_t *cr, gint x, gint y, gint w, gint h, gint flags, void *data);

src/gui/splash.c

@@ -18,6 +18,7 @@
 
 #include "control/conf.h"
 #include "gui/gtk.h"
+#include "dtgtk/button.h"
 #include "splash.h"
 #ifdef GDK_WINDOWING_QUARTZ
 #include "osx/osx.h"
@@ -235,21 +236,15 @@ void darktable_splash_screen_create(GtkWindow *parent_window,
   // and make that the top portion of the splash screen
   gtk_box_pack_start(content, GTK_WIDGET(main_box), FALSE, FALSE, 0);
 #endif
+
   GtkWidget *hbar = gtk_separator_new(GTK_ORIENTATION_HORIZONTAL);
   gtk_widget_set_name(hbar, "splashscreen-separator");
   gtk_widget_show(hbar);
   gtk_box_pack_start(content, hbar, FALSE, FALSE, 0);
   gtk_box_pack_start(content, progress_text, FALSE, FALSE, 0);
 
-  GtkWidget *clock;
-  gchar *clock_file = g_strdup_printf("%s/pixmaps/clock.svg", darktable.datadir);
-  GdkPixbuf *clock_image = gdk_pixbuf_new_from_file_at_size(clock_file, -1, 20, NULL);
-  clock = gtk_image_new_from_pixbuf(clock_image);
-  g_free(clock_file);
-  g_object_unref(clock_image);
-
   remaining_box = GTK_BOX(gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 0));
-  gtk_box_pack_start(remaining_box, GTK_WIDGET(clock), FALSE, FALSE, 0);
+  gtk_box_pack_start(remaining_box, dtgtk_button_new(dtgtk_cairo_paint_clock, 0, 0), FALSE, FALSE, 0);
   gtk_box_pack_start(remaining_box, remaining_text, FALSE, FALSE, 0);
   gtk_box_pack_start(content, GTK_WIDGET(remaining_box), FALSE, FALSE, 0);
   gtk_widget_set_halign(GTK_WIDGET(remaining_box), GTK_ALIGN_CENTER);
@@ -296,6 +291,7 @@ void darktable_splash_screen_set_progress_percent(const char *msg,
       char *rem_text = g_strdup_printf(" %4d:%02d", minutes, seconds);
       gtk_label_set_text(GTK_LABEL(remaining_text), rem_text);
       g_free(rem_text);
+      gtk_widget_queue_draw(GTK_WIDGET(remaining_box));
     }
     else
     {