Module ChunkyPNG::RMagick
In: lib/chunky_png/rmagick.rb

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)

Methods

export   import  

Public Instance methods

export(canvas)

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.

[Source]

    # File lib/chunky_png/rmagick.rb, line 37
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
import(image)

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.

[Source]

    # File lib/chunky_png/rmagick.rb, line 29
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

[Validate]