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task(:verify, :png_file) do |task, args|
require 'rubygems'
require 'bundler/setup'
require 'chunky_png'
require 'oily_png/oily_png_ext'
class OilyPNG::Canvas < ChunkyPNG::Canvas
extend OilyPNG::PNGDecoding
include OilyPNG::PNGEncoding
end
file = args[:png_file] || ENV['PNG_FILE']
raise "Please specify a valid PNG file to verify!" unless File.exist?(file.to_s)
decoding_reference = ChunkyPNG::Canvas.from_file(file)
decoding_oily_png = OilyPNG::Canvas.from_file(file)
if decoding_reference == decoding_oily_png
puts "Decoding test succeeded!"
else
puts "Decoding test FAILED!"
end
oily_png = OilyPNG::Canvas.from_canvas(decoding_reference)
[ChunkyPNG::FILTER_NONE, ChunkyPNG::FILTER_SUB, ChunkyPNG::FILTER_UP, ChunkyPNG::FILTER_AVERAGE, ChunkyPNG::FILTER_PAETH].each do |filter_method|
encoding_reference = decoding_reference.to_blob(:filtering => filter_method, :color_mode => ChunkyPNG::COLOR_TRUECOLOR_ALPHA)
encoding_oily_png = oily_png.to_blob(:filtering => filter_method, :color_mode => ChunkyPNG::COLOR_TRUECOLOR_ALPHA)
if encoding_reference == encoding_oily_png
puts "Encoding test succeeded for filter method #{filter_method}!"
else
puts "Encoding test FAILED for filter method #{filter_method}!"
end
end
[ChunkyPNG::COLOR_GRAYSCALE, ChunkyPNG::COLOR_GRAYSCALE_ALPHA, ChunkyPNG::COLOR_INDEXED, ChunkyPNG::COLOR_TRUECOLOR, ChunkyPNG::COLOR_TRUECOLOR_ALPHA].each do |color_mode|
encoding_reference = decoding_reference.to_blob(:filtering => ChunkyPNG::FILTER_NONE, :color_mode => color_mode)
encoding_oily_png = oily_png.to_blob(:filtering => ChunkyPNG::FILTER_NONE, :color_mode => color_mode)
if encoding_reference == encoding_oily_png
puts "Encoding test succeeded for color mode #{color_mode}!"
else
puts "Decoding test FAILED for color mode #{color_mode}!"
end
end
end
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