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70 lines
2.2 KiB
70 lines
2.2 KiB
require 'launchy' |
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require 'erb' |
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require 'cairo' |
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require 'ruby-progressbar' |
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# An pixel-by-pixel comparison of sample images for visual regression testing |
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class Sanity |
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@@EXPECTED_DIR = "#{File.expand_path(File.dirname(__FILE__))}/expected/" |
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@@OUTPUT_DIR = "#{File.expand_path(File.dirname(__FILE__))}/../../samples/_output/" |
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@@DIFF_DIR = "#{File.expand_path(File.dirname(__FILE__))}/_diffs/" |
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@@SANITY_ERB = "#{File.expand_path(File.dirname(__FILE__))}/sanity.html.erb" |
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@@SANITY_HTML = "#{File.expand_path(File.dirname(__FILE__))}/sanity.html" |
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def images |
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images = [] |
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exp_pngs = Dir[@@EXPECTED_DIR + "/**/*.png"] |
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bar = ProgressBar.create(title: 'Diffing images', total: exp_pngs.size) |
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exp_pngs.each do |exp_png| |
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row = [] |
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actual_png = @@OUTPUT_DIR + File.basename(exp_png) |
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row << "file:///" + exp_png |
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row << "file:///" + actual_png # actual |
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row << "file:///" + diff_image(exp_png, actual_png) |
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images << row |
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bar.increment |
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end |
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bar.finish |
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return images |
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end |
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def run |
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puts "Building sanity test..." |
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sanity_template = File.read(@@SANITY_ERB) |
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process_erb(sanity_template) |
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Launchy.open("file:///" + @@SANITY_HTML) |
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puts "Done." |
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end |
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private |
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def diff_image(exp_file, actual_file) |
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exp = Cairo::ImageSurface.from_png(exp_file) |
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exp_data = exp.data.bytes |
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actual_data = Cairo::ImageSurface.from_png(actual_file).data.bytes |
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new_data = Array.new(exp_data.size, 255) |
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unless exp_data == actual_data # this seems to be the fastest initial comparison |
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(0..exp_data.size).each do |i| |
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empty = (i % 4 == 3) ? 0 : 255 # alpha channel is empty, others are just black |
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new_data[i] = (exp_data[i] == actual_data[i]) ? empty : 128 |
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end |
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end |
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out = Cairo::ImageSurface.new(new_data.pack('c*'), exp.format, exp.width, exp.height, exp.stride) |
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out_file = @@DIFF_DIR + exp_file[exp_file.rindex("/")..-1] |
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out.write_to_png(out_file) |
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out_file |
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end |
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def diff_pixel(exp, actual) |
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(exp == actual) ? [0, 0, 0, 0] : [255, 0, 0, 255] |
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end |
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def process_erb(sanity_template) |
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renderer = ERB.new(sanity_template) |
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File.open(@@SANITY_HTML, 'w+') do |html| |
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html.write(renderer.result(binding)) |
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end |
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end |
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end |