Extracted focus to SpriteObject for joker selling - WIP

source/sprite.c

@@ -8,6 +8,7 @@
 
 #define MAX_SPRITES 128
 #define MAX_AFFINES 32
+#define SPRITE_FOCUS_RAISE_PX 10
 
 OBJ_ATTR obj_buffer[MAX_SPRITES];
 OBJ_AFFINE *obj_aff_buffer = (OBJ_AFFINE*)obj_buffer;
@@ -239,3 +240,18 @@ Sprite* sprite_object_get_sprite(SpriteObject* sprite_object)
         return NULL;
     return sprite_object->sprite;
 }
+
+void sprite_object_set_focus(SpriteObject* sprite_object, bool focus)
+{
+    if (sprite_object->focused == focus)
+    {
+        return;
+    }
+    
+    sprite_object->ty = sprite_object->ty + (focus ? -1 : 1) * SPRITE_FOCUS_RAISE_PX;
+}
+
+bool sprite_object_is_focused(SpriteObject* sprite_object)
+{
+    return sprite_object->focused;
+}