win32-screenshot-bench.rb

require "benchmark"
require "rmagick"
$LOAD_PATH.unshift(File.join(File.dirname(__FILE__), 'lib'))
require 'win32/screenshot'

t = "Internet Explorer"
Benchmark.bmbm do |x|
  x.report("no file") {50.times {Win32::Screenshot.window(t, 0) {}}}

  x.report("bmp") do
    50.times do
      Win32::Screenshot.window(t, 0) do |w, h, b|
        File.open("picture.bmp", "wb") {|f| f.puts b}
      end
    end
  end

  x.report("png") do
    50.times do
      Win32::Screenshot.window(t, 0) do |w, h, b|
        img = Magick::Image.from_blob(b)
        png = img[0].to_blob {self.format = 'PNG'}
        File.open("picture.png", "wb") do |f|
          f.puts png
        end
      end
    end
  end

  x.report("rect") do
    50.times do
      Win32::Screenshot.window_rect(t, 0, 0, 100, 200, 0) do |w, h, b|
        img = Magick::Image.from_blob(b)
        png = img[0].to_blob {self.format = 'PNG'}
        File.open("picture-rect.png", "wb") do |f|
          f.puts png
        end
      end
    end
  end

  x.report("crop") do
    50.times do
      Win32::Screenshot.window(t, 0) do |w, h, b|
        img = Magick::Image.from_blob(b)
        img[0].crop!(0, 0, 100, 200)
        png = img[0].to_blob {self.format = 'PNG'}
        File.open("picture-crop.png", "wb") do |f|
          f.puts png
        end
      end
    end
  end
end

=begin
output:

Rehearsal -------------------------------------------
no file   1.451000   1.014000   2.465000 (  3.123179)
bmp       1.529000   1.232000   2.761000 (  3.739214)
png      11.372000   1.389000  12.761000 ( 14.965856)
rect      0.578000   0.078000   0.656000 (  0.847049)
crop      2.262000   1.185000   3.447000 (  4.491257)
--------------------------------- total: 22.090000sec

              user     system      total        real
no file   1.404000   0.874000   2.278000 (  2.918166)
bmp       1.404000   1.154000   2.558000 (  3.240186)
png      11.248000   1.326000  12.574000 ( 14.314819)
rect      0.452000   0.156000   0.608000 (  0.757044)
crop      2.246000   1.139000   3.385000 (  4.172238)
=end