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/*
 * Get the Imlib2::Color::CmyaColor value of the pixel at x, y
 *
 * Examples:
 *   color = image.query_pixel_cmya 320, 240
 *   color = image.pixel_cmya 320, 240
 *
 */
static VALUE image_query_pixel_cmya(VALUE self, VALUE x, VALUE y) {