for (int y = 0; y < height; y++) {
	RGBA *row = ib[y];
	for (int x = 0; x < width ; x++) {
	 	unsigned long pixel = XGetPixel(image, x, y);
		unsigned char blue  = pixel & blue_mask;
		unsigned char green = (pixel & green_mask) >> 8;
		unsigned char red   = (pixel & red_mask) >> 16;
		(row + x)->r = red;
		(row + x)->g = green;
		(row + x)->b = blue;
+-->            (row + x)->a = 0xff;
	}
}