ext/RMagick/rmutil.c in rmagick-4.2.2 vs ext/RMagick/rmutil.c in rmagick-4.2.3

@@ -856,10 +856,29 @@
 
     RB_GC_GUARD(exc);
     RB_GC_GUARD(mesg);
 }
 
+#if defined(IMAGEMAGICK_7)
+/**
+ * Sets the alpha channel of a pixel color
+ *
+ * No Ruby usage (internal function)
+ *
+ * @param pixel the Pixel
+ * @param value the value
+ */
+void
+rm_set_pixelinfo_alpha(PixelInfo *pixel, const MagickRealType value)
+{
+    pixel->alpha = value;
+    if (value != (MagickRealType) OpaqueAlpha)
+    {
+        pixel->alpha_trait = BlendPixelTrait;
+    }
+}
+#endif
 
 /**
  * Initialize a new ImageMagickError object - store the "loc" string in the
  * magick_location instance variable.
  *
@@ -1006,9 +1025,10 @@
         argv[0] = img;
         opt_args = rb_class_new_instance(1, argv, optional_method_arguments);
 
         if (rb_proc_arity(rb_block_proc()) == 0)
         {
+            rb_warn("passing a block without an image argument is deprecated");
             rb_obj_instance_eval(0, NULL, opt_args);
         }
         else
         {
             rb_yield(opt_args);