module ChunkyPNG::RMagick

Methods for importing and exporting RMagick image objects.

By default, this module is disabled because of the dependency on RMagick. You need to include this module yourself if you want to use it.

@example

require 'rmagick'
require 'chunky_png/rmagick'

canvas = ChunkyPNG::Canvas.from_file('filename.png')
image = ChunkyPNG::RMagick.export(canvas)

# do something with the image using RMagick

updated_canvas = ChunkyPNG::RMagick.import(image)

Public Instance Methods

export (canvas)

Source

   # File lib/chunky_png/rmagick.rb
37 def export(canvas)
38   image = Magick::Image.new(canvas.width, canvas.height)
39   image.import_pixels(0, 0, canvas.width, canvas.height, "RGBA", canvas.pixels.pack("N*"))
40   image
41 end

Exports a Canvas as RMagick image instance. @param [ChunkyPNG::Canvas] canvas The canvas to export. @return [Magick::Image] The RMagick image constructed from the Canvas instance.

import (image)

Source

   # File lib/chunky_png/rmagick.rb
29 def import(image)
30   pixels = image.export_pixels_to_str(0, 0, image.columns, image.rows, "RGBA")
31   ChunkyPNG::Canvas.from_rgba_stream(image.columns, image.rows, pixels)
32 end

Imports an RMagick image as Canvas object. @param [Magick::Image] image The image to import @return [ChunkyPNG::Canvas] The canvas, constructed from the RMagick image.