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require 'rubygems'
require 'bundler/setup'
require 'benchmark'
require 'chunky_png'
def image_file(name)
File.join(File.dirname(__FILE__), '..', 'spec', 'resources', name)
end
def image_data(name)
data = nil
File.open(image_file(name), 'rb') { |f| data = f.read }
data
end
no_filtering_stream = image_data('pixelstream_fast_rgba.png')
up_filtering_stream = image_data('pixelstream_reference.png')
paeth_filtering_stream = image_data('pixelstream_best_compression.png')
rgba_pixelstream = image_data('pixelstream.rgba')
rgb_pixelstream = image_data('pixelstream.rgb')
n = (ENV['N'] || '5').to_i
puts "---------------------------------------------"
puts "ChunkyPNG (#{ChunkyPNG::VERSION}) decoding benchmark (n=#{n})"
puts "---------------------------------------------"
puts
Benchmark.bmbm do |x|
x.report('PNG - no filtering') { n.times { ChunkyPNG::Image.from_blob(no_filtering_stream) } }
x.report('PNG - UP filtering') { n.times { ChunkyPNG::Image.from_blob(up_filtering_stream) } }
x.report('PNG - PAETH filtering') { n.times { ChunkyPNG::Image.from_blob(paeth_filtering_stream) } }
x.report('From RGBA pixelstream') { n.times { ChunkyPNG::Image.from_rgba_stream(240, 180, rgba_pixelstream) } }
x.report('From RGB pixelstream') { n.times { ChunkyPNG::Image.from_rgb_stream(240, 180, rgb_pixelstream) } }
end
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