code: def from_string(cls, width, height, rgba_string):
          
          # Convert RGBA string to ARGB
          raw = ""
          for i in range(0, len(rgba_string), 4):
              raw += rgba_string[i+3]   # alpha
              raw += rgba_string[i:i+3] # rgb
  
          assert len(rgba_string) == width * height * 4
  
          return Form(
              width = width,
              height = height,
              depth = 32,
              bits = Bitmap(raw),
          )
docs: Returns a Form with 32-bit RGBA pixels
          Accepts string containing raw RGBA color values