Game scripts running on RGD (an RGSS runtime)

bitmap.process_color { |arr| ... }

arr is a ColorArray, which is Color[] starting from the top-left corner, which means arr[0] is bitmap.get_pixel(0, 0).

ColorArray has [], []=, size, save_data, load_data methods. Note that it is not a subclass of Array.

buffer = "\0" * 4
bitmap.process_color { |arr| arr.save_data(buffer, 1) }
buffer.unpack 'C*' #=> [0x56, 0x34, 0x12, 0x78]
bitmap.get_pixel(0, 0) #=> Color(0x12, 0x34, 0x56, 0x78)

Saves N colors into buffer (a string). For each color, it saves 4 bytes in the order of bgra.

Graphics.filter = 1
Graphics.resize_window(Graphics.width * 2, Graphics.height * 2)

Graphics.filter is 0 by default, meaning that it uses nearest insert algorithm to make the graphics look very pixel. You can change it to 1 so that it will use the same way as the original RGSS does, which looks a bit blur.