Module: ChunkyPNG::Canvas::StreamExporting

Included in:
ChunkyPNG::Canvas
Defined in:
lib/chunky_png/canvas/stream_exporting.rb

Overview

Methods to save load a canvas from to stream, encoded in RGB, RGBA, BGR or ABGR format.

Instance Method Summary collapse

Instance Method Details

#to_abgr_stream ⇒ String

Creates an ABGR-formatted pixelstream with the pixel data from this canvas.

Note that this format is fast but bloated, because no compression is used and the internal representation is left intact. To reconstruct the canvas, the width and height should be known.

Returns:

  • (String) —

    The RGBA-formatted pixel data.



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# File 'lib/chunky_png/canvas/stream_exporting.rb', line 36

def to_abgr_stream
  pixels.pack('V*')
end

#to_rgb_stream ⇒ String

Creates an RGB-formatted pixelstream with the pixel data from this canvas.

Note that this format is fast but bloated, because no compression is used and the internal representation is almost left intact. To reconstruct the canvas, the width and height should be known.

Returns:

  • (String) —

    The RGB-formatted pixel data.



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# File 'lib/chunky_png/canvas/stream_exporting.rb', line 25

def to_rgb_stream
  pixels.pack('NX' * (width * height))
end

#to_rgba_stream ⇒ String

Creates an RGB-formatted pixelstream with the pixel data from this canvas.

Note that this format is fast but bloated, because no compression is used and the internal representation is left intact. To reconstruct the canvas, the width and height should be known.

Returns:

  • (String) —

    The RGBA-formatted pixel data.



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# File 'lib/chunky_png/canvas/stream_exporting.rb', line 14

def to_rgba_stream
  pixels.pack('N*')
end