ext/jpeg_jpeg.c in jpeg-0.2.2 vs ext/jpeg_jpeg.c in jpeg-0.3.0

@@ -10,21 +10,24 @@
 static void jpeg_jpeg_mark(struct jpeg_jpeg *p);
 static void jpeg_jpeg_free(struct jpeg_jpeg *p);
 static VALUE jpeg_jpeg_width(VALUE self);
 static VALUE jpeg_jpeg_height(VALUE self);
 static VALUE jpeg_jpeg_size(VALUE self);
+static VALUE jpeg_jpeg_color_info(VALUE self);
 
 extern VALUE Jpeg_Error;
 
 void Init_jpeg_jpeg() {
     Jpeg = rb_define_class("Jpeg", rb_cObject);
     rb_define_alloc_func(Jpeg, jpeg_jpeg_alloc);
     rb_define_singleton_method(Jpeg, "open", jpeg_jpeg_s_open, -1);
     rb_define_method(Jpeg, "width", jpeg_jpeg_width, 0);
     rb_define_method(Jpeg, "height", jpeg_jpeg_height, 0);
     rb_define_method(Jpeg, "size", jpeg_jpeg_size, 0);
+    rb_define_method(Jpeg, "color_info", jpeg_jpeg_color_info, 0);
 }
+
 void jpeg_jpeg_exit(j_common_ptr jpeg) {
     char buffer[JMSG_LENGTH_MAX];
     jpeg->err->format_message(jpeg, buffer);
     rb_raise(Jpeg_Error, buffer);
 }
@@ -99,6 +102,13 @@
     array = rb_ary_new();
     rb_ary_push(array, rb_int_new(p_jpeg->read->output_width));
     rb_ary_push(array, rb_int_new(p_jpeg->read->output_height));
 
     return array;
+}
+
+static VALUE jpeg_jpeg_color_info(VALUE self) {
+    struct jpeg_jpeg *p_jpeg;
+
+    Data_Get_Struct(self, struct jpeg_jpeg, p_jpeg);
+    return ID2SYM(rb_intern( p_jpeg->read->out_color_components == 3 ? "rgb" : "gray" ));
 }