1 files changed, 140 insertions, 0 deletions
diff --git a/app/display/gimpdisplayshell-icon.c b/app/display/gimpdisplayshell-icon.c
new file mode 100644
index 0000000..6168820
--- /dev/null
+++ b/app/display/gimpdisplayshell-icon.c
@@ -0,0 +1,140 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <string.h>
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "display-types.h"
+
+#include "core/gimp.h"
+#include "core/gimpimage.h"
+
+#include "widgets/gimpwidgets-utils.h"
+
+#include "gimpdisplay.h"
+#include "gimpdisplayshell.h"
+#include "gimpdisplayshell-icon.h"
+
+
+#define GIMP_DISPLAY_UPDATE_ICON_TIMEOUT  1000
+
+static gboolean   gimp_display_shell_icon_update_idle (gpointer data);
+
+
+/*  public functions  */
+
+void
+gimp_display_shell_icon_update (GimpDisplayShell *shell)
+{
+  g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
+
+  gimp_display_shell_icon_update_stop (shell);
+
+  if (gimp_display_get_image (shell->display))
+    shell->icon_idle_id = g_timeout_add_full (G_PRIORITY_LOW,
+                                              GIMP_DISPLAY_UPDATE_ICON_TIMEOUT,
+                                              gimp_display_shell_icon_update_idle,
+                                              shell,
+                                              NULL);
+  else
+    gimp_display_shell_icon_update_idle (shell);
+}
+
+void
+gimp_display_shell_icon_update_stop (GimpDisplayShell *shell)
+{
+  g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
+
+  if (shell->icon_idle_id)
+    {
+      g_source_remove (shell->icon_idle_id);
+      shell->icon_idle_id = 0;
+    }
+}
+
+
+/*  private functions  */
+
+static gboolean
+gimp_display_shell_icon_update_idle (gpointer data)
+{
+  GimpDisplayShell *shell = GIMP_DISPLAY_SHELL (data);
+  GimpImage        *image = gimp_display_get_image (shell->display);
+  GdkPixbuf        *icon  = NULL;
+
+  shell->icon_idle_id = 0;
+
+  if (image)
+    {
+      Gimp      *gimp = gimp_display_get_gimp (shell->display);
+      GdkPixbuf *pixbuf;
+      gint       width;
+      gint       height;
+      gdouble    factor = ((gdouble) gimp_image_get_height (image) /
+                           (gdouble) gimp_image_get_width  (image));
+
+      if (factor >= 1)
+        {
+          height = MAX (shell->icon_size, 1);
+          width  = MAX (((gdouble) shell->icon_size) / factor, 1);
+        }
+      else
+        {
+          height = MAX (((gdouble) shell->icon_size) * factor, 1);
+          width  = MAX (shell->icon_size, 1);
+        }
+
+      pixbuf = gimp_viewable_get_pixbuf (GIMP_VIEWABLE (image),
+                                         gimp_get_user_context (gimp),
+                                         width, height);
+
+      icon = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
+                             shell->icon_size, shell->icon_size);
+
+      memset (gdk_pixbuf_get_pixels (icon), 0,
+              gdk_pixbuf_get_height (icon) *
+              gdk_pixbuf_get_rowstride (icon));
+
+      gdk_pixbuf_copy_area (pixbuf, 0, 0, width, height,
+                            icon,
+                            0, shell->icon_size - height);
+
+      pixbuf = gimp_widget_load_icon (GTK_WIDGET (shell), "gimp-wilber-outline",
+                                      shell->icon_size_small);
+
+      width  = gdk_pixbuf_get_width  (pixbuf);
+      height = gdk_pixbuf_get_height (pixbuf);
+
+      gdk_pixbuf_composite (pixbuf, icon,
+                            shell->icon_size - width, 0,
+                            width, height,
+                            shell->icon_size - width, 0.0, 1.0, 1.0,
+                            GDK_INTERP_NEAREST, 255);
+      g_object_unref (pixbuf);
+    }
+
+  g_object_set (shell, "icon", icon, NULL);
+
+  if (icon)
+    g_object_unref (icon);
+
+  return FALSE;
+}