Saving Bitmaps as Files

[SephirothSpawn]

Saving Bitmaps as Files
SephirothSpawn
Aug 17 2006

This is a locked, single-post thread from Creation Asylum. Archived here to prevent its loss.
No support is given.

Ok, this isn't as much as a script as it is a tool to save bitmaps as data, then recover them later. It was nothing more than 10 minutes of working with the get_pixel and set_pixel methods. Anyways, here's the mini-code

Code:

module BitmapDump
  def self.save_bitmap(bitmap, filename)
    red = Table.new(bitmap.width, bitmap.height)
    green = Table.new(bitmap.width, bitmap.height)
    blue = Table.new(bitmap.width, bitmap.height)
    alpha = Table.new(bitmap.width, bitmap.height)
    for i in 0...bitmap.width
      for j in 0...bitmap.height
        color = bitmap.get_pixel(i, j)
        red[i, j] = color.red
        green[i, j] = color.green
        blue[i, j] = color.blue
        alpha[i, j] = color.alpha
      end
    end
    file = File.open("#{filename}.rxdata", 'wb')
      Marshal.dump([red, green, blue, alpha], file)
    file.close
  end
  def self.read_bitmap(filename)
    file = File.open("#{filename}.rxdata", 'rb')
      colors = Marshal.load(file)
    file.close
    red, green, blue, alpha = colors[0], colors[1], colors[2], colors[3], colors[4]
    bitmap = Bitmap.new(red.xsize, red.ysize)
    for i in 0...bitmap.width
      for j in 0...bitmap.height
        bitmap.set_pixel(i, j, Color.new(red[i, j], green[i, j], blue[i, j], alpha[i, j]))
      end
    end
    return bitmap
  end
end

It is fairly simple to use:

To save a bitmap, simply use:

Code:

BitmapDump.save_bitmap(bitmap, filename)

It will then save the bitmap as data in your game folder. I would make a new folder called Bitmap Data or something and have stuff save there, but that may just be me.

To Recover Saved Bitmap, use:

Code:

bitmap = BitmapDump.read_bitmap(filename)

Just a little trick someone might find some use for (I will be soon.