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Versions: 11
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Stored size: 1.39 KB
Contents
#!ruby
require 'chunky_png'
class ImageCompare
include ChunkyPNG::Color
def self.compare(file_name, old_file_name)
name = file_name.chomp('.png')
org_file_name = "#{name}_0.png~"
new_file_name = "#{name}_1.png~"
return nil unless File.exists? old_file_name
images = [
ChunkyPNG::Image.from_file(old_file_name),
ChunkyPNG::Image.from_file(file_name),
]
sizes = images.map(&:width).uniq + images.map(&:height).uniq
if sizes.size != 2
logger.warn "Image size has changed for #{name}: #{sizes}"
return nil
end
diff = []
images.first.height.times do |y|
images.first.row(y).each_with_index do |pixel, x|
unless pixel == images.last[x, y]
diff << [x, y]
end
end
end
if diff.empty?
File.delete(org_file_name) if File.exists? org_file_name
File.delete(new_file_name) if File.exists? new_file_name
return false
end
x, y = diff.map { |xy| xy[0] }, diff.map { |xy| xy[1] }
(1..2).each do |i|
images.each do |image|
image.rect(x.min - i, y.min - i, x.max + i, y.max + i, ChunkyPNG::Color.rgb(255, 0, 0))
end
end
images.first.save(org_file_name)
images.last.save(new_file_name)
true
end
end
if $0 == __FILE__
unless ARGV.size == 2
puts "Usage: #$0 <image1> <image2>"
exit 1
end
ImageCompare.compare(ARGV[0], ARGV[1])
end
Version data entries
11 entries across 11 versions & 2 rubygems