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)
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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.
# 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
import(image)
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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.
# 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