module ChunkyPNG::Canvas::StreamImporting

def from_rgb_stream(width, height, stream)

Returns:

(ChunkyPNG::Canvas) - The newly constructed canvas instance.

Parameters:

stream (#read, String) -- The stream to read the pixel data from.
height (Integer) -- The height of the new canvas.
width (Integer) -- The width of the new canvas.

def from_rgb_stream(width, height, stream)
  string = stream.respond_to?(:read) ? stream.read(3 * width * height) : stream.to_s[0, 3 * width * height]
  string << ChunkyPNG::EXTRA_BYTE # Add a fourth byte to the last RGB triple.
  unpacker = 'NX' * (width * height)
  pixels = string.unpack(unpacker).map { |color| color | 0x000000ff }
  self.new(width, height, pixels)
end

Instance Methods