 rubyid_initialize'>initialize</span><span class='lparen'>(</span><span class='id identifier rubyid_a'>a</span><span class='comma'>,</span> <span class='id identifier rubyid_pixels'>pixels</span><span class='op'>=</span><span class='kw'>nil</span><span class='comma'>,</span> <span class='id identifier rubyid_mask'>mask</span><span class='op'>=</span><span class='kw'>nil</span><span class='comma'>,</span> <span class='id identifier rubyid_opts'>opts</span><span class='op'>=</span><span class='int'>0</span><s