WIP: https://docs.gtk.org/gdk4/iface.Paintable.html GdkPaintable is a simple interface used by GTK to represent content that can be painted.

src/widget/rules/tree_tools/compare.c

@@ -98,10 +98,10 @@ static GtkWidget *peek(Stack *stack)
 }
 
 // -----------------------------------------------------------
-// 2024-08-01
+// 2024-08-01  neox dixit :
 // GTK possède un espace mémoire où les widgets sont alloués/désalloués
 // Un widget ne conserve pas son pointeur.  Son adresse peut changer.
-// Donc créer une stack de widget avec un outil hors GTK n'est pas faisable  >>
+// Créer une stack de widget avec un outil hors GTK n'est pas faisable. Donc :
 // - soit tu traites les images hors de GTK,
 // - soit tu trouves un outil dans GTK pour ce type d'opération.
 // C'est le cas de toute bibliothèque externe que tu utilises :
@@ -122,8 +122,22 @@ static GtkWidget *peek(Stack *stack)
 // Donc une application injective & non-surjective.
 //
 // https://docs.gtk.org/gio/iface.ListModel.html?q=icon    <<    TODO
+// https://docs.gtk.org/gtk4/class.Image.html
+// Sometimes an application will want to avoid depending on external data files,
+// such as image files. See the documentation of GResource inside GIO, for details.
+// In this case, GtkImage:resource, gtk_image_new_from_resource(),
+// and gtk_image_set_from_resource() should be used.
+// GtkImage displays its image as an icon, with a size that is determined by the application.
+// See GtkPicture if you want to show an image at is actual size.
+// https://docs.gtk.org/gtk4/ctor.Image.new_from_resource.html
+// The storage type (see gtk_image_get_storage_type()) of the returned image is not defined,
+// it will be whatever is appropriate for displaying the file.
+// https://docs.gtk.org/gdk4/iface.Paintable.html
+// GdkPaintable is a simple interface used by GTK to represent content that can be painted.
+// In order to implement Paintable, your type must inherit fromGObject.
 
 static void *push_images_onto_stack (Stack stack_b);
+static GtkWidget *do_rtfd (Stack stack_b);
 
 void *get_an_impression_of_what_a_rules_comparator_could_be(){
 
@@ -136,6 +150,7 @@ void *get_an_impression_of_what_a_rules_comparator_could_be(){
     initialize(&stack_b);
 
 //    push_images_onto_stack (stack_b);
+    do_rtfd (stack_b);
 
     push(&stack_b, GTK_WIDGET (gtk_picture_new_for_filename
         ("/home/jean/Gem-Graph/gem-graph-client/data/image/glutathione.png")));
@@ -171,9 +186,23 @@ void *get_an_impression_of_what_a_rules_comparator_could_be(){
 
 
 
-
+static GtkWidget *do_rtfd (Stack stack)
-
+{
-
+    GtkImage *image_insuline = GTK_IMAGE (gtk_image_new_from_resource
+        ("/home/jean/Gem-Graph/gem-graph-client/data/image/insuline.png"));
+    gtk_image_set_from_resource (image_insuline,
+        "/home/jean/Gem-Graph/gem-graph-client/data/image/legumin.png");
+    gtk_image_set_pixel_size (image_insuline, 256);
+    GtkImageType image_insuline_storage_type = gtk_image_get_storage_type (image_insuline);
+//    gtk_image_set_from_paintable (image_insuline,  ? GdkPaintable* paintable);
+    GdkPaintable* paintable_insulin
+        = gdk_paintable_get_current_image (GDK_PAINTABLE (image_insuline));
+    GtkWidget *widget_insuline = GTK_WIDGET (image_insuline);
+    if (image_insuline_storage_type == GTK_IMAGE_ICON_NAME)
+    printf("insuline image now at : %p   storage_type : %s\n",
+           &image_insuline, "GTK_IMAGE_ICON_NAME");
+    return widget_insuline;
+}