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Contents
require 'rmagick'
module ChunkyPNG
# 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)
#
module RMagick
extend self
# 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.
def import(image)
pixels = image.export_pixels_to_str(0, 0, image.columns, image.rows, 'RGBA')
ChunkyPNG::Canvas.from_rgba_stream(image.columns, image.rows, pixels)
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.
def export(canvas)
image = Magick::Image.new(canvas.width, canvas.height)
image.import_pixels(0,0, canvas.width, canvas.height, 'RGBA', canvas.pixels.pack('N*'))
image
end
end
end
Version data entries
48 entries across 47 versions & 4 rubygems