Class: Smartware::Driver::UserInterface::X11

Inherits:
Object
  • Object
show all
Defined in:
lib/smartware/drivers/user_interface/x11.rb

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ X11

Returns a new instance of X11.



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# File 'lib/smartware/drivers/user_interface/x11.rb', line 8

def initialize(config)
  @user = config["user"]
  @display = config["display"]
end

Instance Method Details

#delete_calibration ⇒ Object 



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# File 'lib/smartware/drivers/user_interface/x11.rb', line 13

def delete_calibration
  File.delete "/home/#{@user}/.calibration_data" rescue nil
  File.delete "/home/#{@user}/.monitors" rescue nil
end

#restart_ui ⇒ Object 



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# File 'lib/smartware/drivers/user_interface/x11.rb', line 18

def restart_ui
  system "pkill", "-U", @user, "xinit"
end

#screenshot ⇒ Object 



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# File 'lib/smartware/drivers/user_interface/x11.rb', line 22

def screenshot
  mine_pipe, xwd_pipe = IO.pipe
  png = nil

  begin
    pid = Process.spawn({
      "DISPLAY"    => @display,
      "XAUTHORITY" => "/home/#{@user}/.Xauthority"
    }, "xwd", "-root", in: :close, out: xwd_pipe)

    xwd_pipe.close
    xwd_pipe = nil


    header_size, file_version,
    pixmap_format, pixmap_depth, pixmap_width, pixmap_height,
    xoffset, byteorder, bitmap_unit, bitmap_bit_order, bitmap_pad,
    bits_per_pixel, bytes_per_line, visual_class,
    red_mask, green_mask, blue_mask, bits_per_rgb,
    number_of_colors, color_map_entires,
    window_width, window_height, window_x, window_y, window_border_width =
      mine_pipe.read(4 * 25).unpack("N*")

    raise "Only direct color images are supported" if (visual_class != 5 && visual_class != 4)

    mine_pipe.read((header_size + number_of_colors * 12) - 4 * 25)

    initial = Array.new pixmap_width, pixmap_height

    case bits_per_pixel
    when 24
      0.upto(pixmap_height - 1) do |y|
        line = mine_pipe.read(bytes_per_line)
                        .slice(0, bits_per_pixel / 8 * pixmap_width)

        0.upto(pixmap_width - 1) do |x|
          initial[y * pixmap_width + x] =
              (line.getbyte(x * 3 + 2) << 24) |
              (line.getbyte(x * 3 + 1) << 16) |
              (line.getbyte(x * 3 + 0) << 8) |
              0xFF
        end
      end

    when 32
      0.upto(pixmap_height - 1) do |y|
        line = mine_pipe.read(bytes_per_line)
                        .slice(0, bits_per_pixel / 8 * pixmap_width)

        0.upto(pixmap_width - 1) do |x|
          pix, = line.slice(x * 4, 4).unpack("V")
          initial[y * pixmap_width + x] = ((pix & 0xFFFFFF) << 8) | 0xFF
        end
      end

    else
      raise "Unsupported bpp: #{bits_per_pixel}"
    end

    png = ChunkyPNG::Image.new pixmap_width, pixmap_height, initial

    png.to_datastream.to_blob
  rescue => e
    "!error: #{e}"
  ensure
    mine_pipe.close
    xwd_pipe.close unless xwd_pipe.nil?
  end
end