Class: X11::Display

Inherits:
Object
  • Object
show all
Defined in:
lib/X11/display.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(target = ENV['DISPLAY']) ⇒ Display

Open a connection to the specified display (numbered from 0) on the specified host



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# File 'lib/X11/display.rb', line 21

def initialize(target = ENV['DISPLAY'])
  target =~ /^([\w.-]*):(\d+)(?:.(\d+))?$/
  host, display_id, screen_id = $1, $2, $3
  family = nil

  @debug = ENV["PUREX_DEBUG"].to_s.strip == "true"
  
  if host.empty?
    @socket = UNIXSocket.new("/tmp/.X11-unix/X#{display_id}")
    family = :Local
    host = nil
  else
    @socket = TCPSocket.new(host,6000+display_id)
    family = :Internet
  end

  authorize(host, family, display_id)

  @requestseq = 1
  @rqueue = Queue.new       # Read but not returned events
  @wqueue = Queue.new
  @extensions = {}  # Known extensions
  @atoms = {}       # Interned atoms

  start_io
end

Instance Attribute Details

#socket ⇒ Object

Returns the value of attribute socket.



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# File 'lib/X11/display.rb', line 18

def socket
  @socket
end

Instance Method Details

#atom(name) ⇒ Object 



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# File 'lib/X11/display.rb', line 323

def atom(name)
  return name if name.is_a?(Integer) # Allow atom(atom_integer_or_symbol)
  begin
    return Form::Atoms.const_get(name.to_sym) if Form::Atoms.const_defined?(name.to_sym)
  rescue
    # const_defined? will throw if name isn't a valid constant name, but
    # that's fine
  end
  name = name.to_sym
  intern_atom(false, name) if !@atoms[name]
  @atoms[name]
end

#atom_enum(val) ⇒ Object 



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# File 'lib/X11/display.rb', line 419

def atom_enum(val)
  open_enum(val, {cardinal: Form::CardinalAtom, atom: Form::AtomAtom, window: Form::WindowAtom}) || atom(val)
end

#change_gc ⇒ Object 



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# File 'lib/X11/display.rb', line 404

def change_gc(...)      = write_request(Form::ChangeGC.new(...))

#change_property(mode, window, property, type, format, data) ⇒ Object 



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# File 'lib/X11/display.rb', line 394

def change_property(mode, window, property, type, format, data)
  property = atom(property.to_sym) if property.is_a?(Symbol) || property.is_a?(String)

  mode = open_enum(mode, {replace: 0, prepend: 1, append: 2})
  type = atom_enum(type)
  write_request(Form::ChangeProperty.new(mode, window, property, type, format, data))
end

#change_save_set ⇒ Object 



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# File 'lib/X11/display.rb', line 405

def change_save_set(...)= write_request(Form::ChangeSaveSet.new(...))

#change_window_attributes(wid, values: {}) ⇒ Object 



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# File 'lib/X11/display.rb', line 313

def change_window_attributes(wid,
  values: {})
  values = values.sort_by{_1[0]}
  mask =   values.inject(0) {|acc,v| (acc | v[0]) }
  values = values.map{_1[1]}
  write_request(Form::ChangeWindowAttributes.new(wid, mask, values))
end

#clear_area(*args) ⇒ Object 



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# File 'lib/X11/display.rb', line 532

def clear_area(*args)  = write_request(X11::Form::ClearArea.new(*args))

#client_message(window: default_root, type: :ClientMessage, format: 32, destination: default_root, mask: 0, data: [], propagate: true) ⇒ Object 



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# File 'lib/X11/display.rb', line 516

def client_message(window: default_root, type: :ClientMessage, format: 32, destination: default_root, mask: 0, data: [], propagate: true)
  f = {8 => "C20", 16 => "S10", 32 => "L5"}[format]
  p f
  data = (Array(data).map{|item|atom(item)} +[0]*20).pack(f)
  event = Form::ClientMessage.new(
    format, 0, window, atom(type), data
  )
  event.code =33
  pp event
    
  send_event(propagate, destination, mask, event)
end

#close ⇒ Object 



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# File 'lib/X11/display.rb', line 206

def close  = @rqueue.close

#configure_window(window, x: nil, y: nil, width: nil, height: nil, border_width: nil, sibling: nil, stack_mode: nil) ⇒ Object 



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# File 'lib/X11/display.rb', line 470

def configure_window(window, x: nil, y: nil, width: nil, height: nil,
  border_width: nil, sibling: nil, stack_mode: nil)

  values = []
  mask  = 0
  mask |= set_value(values, 0x001, x)
  mask |= set_value(values, 0x002, y)
  mask |= set_value(values, 0x004, width)
  mask |= set_value(values, 0x008, height)
  mask |= set_value(values, 0x010, border_width)
  mask |= set_value(values, 0x020, sibling)

  if stack_mode
    mask |= 0x040
    values << case stack_mode
              when :above then 0
              when :below then 1
              when :top_if then 2
              when :bottom_if then 3
              when :opposite then 4
              else raise "Unknown stack_mode #{stack_mode.inspect}"
              end
  end
  write_request(X11::Form::ConfigureWindow.new(window, mask, values))
end

#copy_area(*args) ⇒ Object 



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# File 'lib/X11/display.rb', line 533

def copy_area(*args)   = write_request(X11::Form::CopyArea.new(*args))

#create_colormap(alloc, window, visual) ⇒ Object 



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# File 'lib/X11/display.rb', line 365

def create_colormap(alloc, window, visual)
  mid = new_id
  write_request(Form::CreateColormap.new(alloc, mid, window, visual))
  mid
end

#create_gc(window, foreground: nil, background: nil, graphics_exposures: nil) ⇒ Object 



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# File 'lib/X11/display.rb', line 497

def create_gc(window, foreground: nil, background: nil,
  graphics_exposures: nil
)
  mask = 0
  args = []

  # FIXME:
  # The rest can be found here:
  # https://tronche.com/gui/x/xlib/GC/manipulating.html#XGCValues
  mask |= set_value(args, 0x04, foreground)
  mask |= set_value(args, 0x08, background)
  mask |= set_value(args, 0x10000, graphics_exposures)
  
  gc = new_id
  write_request(X11::Form::CreateGC.new(gc, window, mask, args))
  gc
end

#create_pixmap(depth, drawable, w, h) ⇒ Object 



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# File 'lib/X11/display.rb', line 541

def create_pixmap(depth, drawable, w,h)
  new_id.tap{|pid| write_request(Form::CreatePixmap.new(depth, pid, drawable, w,h)) }
end

#create_window(x, y, w, h, values: {}, depth: 32, parent: nil, border_width: 0, wclass: X11::Form::InputOutput, visual: nil) ⇒ Object

Requests



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# File 'lib/X11/display.rb', line 285

def create_window(x,y,w,h,
  values: {},
  depth: 32, parent: nil, border_width: 0, wclass: X11::Form::InputOutput, visual: nil
)
  wid = new_id
  parent ||= default_root

  if visual.nil?
    visual = find_visual(0, depth).visual_id
  end

  values[X11::Form::CWColorMap] ||= create_colormap(0, parent, visual)

  values = values.sort_by{_1[0]}
  mask =   values.inject(0) {|acc,v| (acc | v[0]) }
  values = values.map{_1[1]}
  write_request(
    X11::Form::CreateWindow.new(
      depth, wid, parent,
      x,y,w,h,border_width, wclass, visual, mask, values)
  )
  return wid
end

#default_root ⇒ Object 



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# File 'lib/X11/display.rb', line 282

def default_root = screens.first.root

#destroy_window(window) ⇒ Object 



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# File 'lib/X11/display.rb', line 358

def destroy_window(window) = write_request(Form::DestroyWindow.new(window))

#display_info ⇒ Object 



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# File 'lib/X11/display.rb', line 58

def display_info
  @internal
end

#event_handler=(block) ⇒ Object 



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# File 'lib/X11/display.rb', line 48

def event_handler= block
  @event_handler= block
end

#find_visual(screen, depth, qlass = 4) ⇒ Object 



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# File 'lib/X11/display.rb', line 277

def find_visual(screen, depth, qlass = 4)
  self.display_info.screens[screen].depths.find{|d|
    d.depth == depth }.visuals.find{|v| v.qlass = qlass }
end

#flush ⇒ Object 



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# File 'lib/X11/display.rb', line 52

def flush
  while !@wqueue.empty?
    sleep(0.01)
  end
end

#free_pixmap(pixmap) ⇒ Object 



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# File 'lib/X11/display.rb', line 545

def free_pixmap(pixmap)
  write_request(Form::FreePixmap.new(pixmap))
end

#get_atom_name(atom) ⇒ Object 



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# File 'lib/X11/display.rb', line 357

def get_atom_name(atom)    = write_sync(Form::GetAtomName.new(atom), Form::AtomName)&.name

#get_geometry(drawable) ⇒ Object 



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# File 'lib/X11/display.rb', line 359

def get_geometry(drawable) = write_sync(Form::GetGeometry.new(drawable), Form::Geometry)

#get_keyboard_mapping(min_keycode = display_info.min_keycode, count = display_info.max_keycode - min_keycode) ⇒ Object 



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# File 'lib/X11/display.rb', line 361

def get_keyboard_mapping(min_keycode=display_info.min_keycode, count= display_info.max_keycode - min_keycode)
  write_sync(Form::GetKeyboardMapping.new(min_keycode, count), Form::GetKeyboardMappingReply)
end

#get_property(window, property, type, offset: 0, length: 4, delete: false) ⇒ Object 



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# File 'lib/X11/display.rb', line 371

def get_property(window, property, type, offset: 0, length: 4, delete: false)
  property = atom(property)
  type     = atom_enum(type)
  
  result = write_sync(Form::GetProperty.new(
    delete, window, property, type, offset, length
  ), Form::Property)

  if result && result.format != 0
    case result.format
    when 16
      result.value = result.value.unpack("v")
      result.value = result.value.first if length == 2
    when 32
      result.value = result.value.unpack("V")
      result.value = result.value.first if length == 4
    end
  elsif result
    result.value = nil
  end
  result
end

#get_window_attributes(wid) ⇒ Object 



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# File 'lib/X11/display.rb', line 309

def get_window_attributes(wid)
  write_sync( Form::GetWindowAttributes.new(wid), Form::WindowAttributes )
end

#grab_button(owner_events, grab_window, event_mask, pointer_mode, keyboard_mode, confine_to, cursor, button, modifiers) ⇒ Object 



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# File 'lib/X11/display.rb', line 451

def grab_button(owner_events, grab_window, event_mask, pointer_mode,
  keyboard_mode, confine_to, cursor, button, modifiers)
  write_request(Form::GrabButton.new(
    owner_events, grab_window, event_mask,
    pointer_mode == :async ? 1 : 0,
    keyboard_mode == :async ? 1 : 0,
    confine_to.to_i, cursor.to_i, button, modifiers)
  )
end

#grab_key(owner_events, grab_window, modifiers, keycode, pointer_mode, keyboard_mode) ⇒ Object 



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# File 'lib/X11/display.rb', line 440

def grab_key(owner_events, grab_window, modifiers, keycode, pointer_mode, keyboard_mode)
  write_request(Form::GrabKey.new(
    owner_events,
    grab_window,
    modifiers,
    keycode,
    pointer_mode  == :async ? 1 : 0,
    keyboard_mode == :async ? 1 : 0
  ))
end

#image_text16(*args) ⇒ Object 



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# File 'lib/X11/display.rb', line 535

def image_text16(*args)= write_request(X11::Form::ImageText16.new(*args))

#image_text8(*args) ⇒ Object 



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# File 'lib/X11/display.rb', line 534

def image_text8(*args) = write_request(X11::Form::ImageText8.new(*args))

#intern_atom(flag, name) ⇒ Object 



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# File 'lib/X11/display.rb', line 350

def intern_atom(flag, name)
  reply = write_sync(Form::InternAtom.new(flag, name.to_s),Form::InternAtomReply)
  if reply
    @atoms[name.to_sym] = reply.atom
  end
end

#list_fonts ⇒ Object 



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# File 'lib/X11/display.rb', line 402

def list_fonts(...)     = write_sync(Form::ListFonts.new(...), Form::ListFontsReply)

#major_opcode(name) ⇒ Object 



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# File 'lib/X11/display.rb', line 342

def major_opcode(name)
  if !@extensions[name]
    query_extension(name)
  end
  raise "No such extension '#{name}'" if !@extensions[name]
  @extensions[name][:major]
end

#map_window ⇒ Object 



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# File 'lib/X11/display.rb', line 413

def map_window(...)   = write_request(Form::MapWindow.new(...))

#new_id ⇒ Object

The resource-id-mask contains a single contiguous set of bits (at least 18). The client allocates resource IDs for types WINDOW, PIXMAP, CURSOR, FONT, GCONTEXT, and COLORMAP by choosing a value with only some subset of these bits set and ORing it with resource-id-base.



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# File 'lib/X11/display.rb', line 74

def new_id
  id = (@xid_next ||= 0)
  @xid_next += 1

  (id & @internal.resource_id_mask) | @internal.resource_id_base
end

#next_packet ⇒ Object 



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# File 'lib/X11/display.rb', line 204

def next_packet = @rqueue.shift

#open_enum(val, map) ⇒ Object 



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# File 'lib/X11/display.rb', line 428

def open_enum(val, map) = (map[val].nil? ? val : map[val])

#open_font ⇒ Object 



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# File 'lib/X11/display.rb', line 403

def open_font(...)      = write_request(Form::OpenFont.new(...))

#peek_packet ⇒ Object 



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# File 'lib/X11/display.rb', line 203

def peek_packet = !@rqueue.empty?

#poly_fill_rectangle(wid, gc, *rects) ⇒ Object 



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# File 'lib/X11/display.rb', line 536

def poly_fill_rectangle(wid, gc, *rects)
  rects = rects.map{|r| r.is_a?(Array) ? Form::Rectangle.new(*r) : r}
  write_request(X11::Form::PolyFillRectangle.new(wid, gc, rects))
end

#put_image(*args) ⇒ Object 



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# File 'lib/X11/display.rb', line 531

def put_image(*args)   = write_request(X11::Form::PutImage.new(*args))

#query_extension(name) ⇒ Object 



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# File 'lib/X11/display.rb', line 336

def query_extension(name)
  r = write_sync(Form::QueryExtension.new(name), Form::QueryExtensionReply)
  @extensions[name] = { major: r.major_opcode }
  r
end

#query_pointer(window) ⇒ Object 



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# File 'lib/X11/display.rb', line 663

def query_pointer(window)
  write_sync(Form::QueryPointer.new(window), Form::QueryPointerReply)
end

#query_tree ⇒ Object 



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# File 'lib/X11/display.rb', line 529

def query_tree(...) = write_sync(X11::Form::QueryTree.new(...), X11::Form::QueryTreeReply)

#read_error(data) ⇒ Object 



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# File 'lib/X11/display.rb', line 81

def read_error data
  error = Form::Error.from_packet(StringIO.new(data))
  # FIXME: Maybe make this configurable, as it means potentially
  # keeping along really heavy requests. or alternative purge them
  # more aggressively also when there are no errors, as otherwise
  # the growth might be unbounded
  error.request = @requests[error.sequence_number]
  @requests.keys.find_all{|s| s <= error.sequence_number}.each do |s|
    @requests.delete(s)
  end
  STDERR.puts "ERROR: #{error.inspect}"
  error
end

#read_event(type, data, event_class) ⇒ Object 



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# File 'lib/X11/display.rb', line 103

def read_event type, data, event_class
  io = StringIO.new(data)
  case type
  # 0 is error, not handled here
  # 1 is reply, not handled here
  when 2  then return Form::KeyPress.from_packet(io)
  when 3  then return Form::KeyRelease.from_packet(io)
  when 4  then return Form::ButtonPress.from_packet(io)
  when 5  then return Form::ButtonRelease.from_packet(io)
  when 6  then return Form::MotionNotify.from_packet(io)
  when 7  then return Form::EnterNotify.from_packet(io)
  when 8  then return Form::LeaveNotify.from_packet(io)
  when 9  then return Form::FocusIn.from_packet(io)
  when 10 then return Form::FocusOut.from_packet(io)
  # FIXME 11: KeymapNotify
  when 12 then return Form::Expose.from_packet(io)
  # FIXME 13: GraphicsExposure
  when 14 then return Form::NoExposure.from_packet(io)
  # FIXME: 15: VisibilityNotify
  when 16 then return Form::CreateNotify.from_packet(io)
  when 17 then return Form::DestroyNotify.from_packet(io)
  when 18 then return Form::UnmapNotify.from_packet(io)
  when 19 then return Form::MapNotify.from_packet(io)
  when 20 then return Form::MapRequest.from_packet(io)
  when 21 then return Form::ReparentNotify.from_packet(io)
  when 22 then return Form::ConfigureNotify.from_packet(io)
  when 23 then return Form::ConfigureRequest.from_packet(io)
  # FIXME: 24: GravityNotify
  # FIXME: 25: ResizeRequest
  # FIXME: 26: CirculateNotify
  # FIXME: 27: CirculateRequest
  when 28 then return Form::PropertyNotify.from_packet(io)
  # FIXME: 29: SelectionClear
  # FIXME: 30: SelectionRequest
  # FIXME: 31: SelectionNotify
  # FIXME: 32: ColormapNotify
  when 33 then return Form::ClientMessage.from_packet(io)
  # FIXME: 34: MappingNotify
  else
    STDERR.puts "FIXME: Event: #{type}"
    STDERR.puts "EVENT: #{data.inspect}"
    data
  end
end

#read_full_packet(len = 32) ⇒ Object 



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# File 'lib/X11/display.rb', line 148

def read_full_packet(len = 32)
  data = @socket.read(32)
  return nil if data.nil?
  while data.length < 32
    IO.select([@socket],nil,nil,0.001)
    data.concat(@socket.read_nonblock(32 - data.length))
  end
  return data
end

#read_packet ⇒ Object 



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# File 'lib/X11/display.rb', line 158

def read_packet
  data = read_full_packet(32)
  return nil if data.nil?

  # FIXME: Make it configurable.
  @requests.keys.find_all{|s| s <= @requestseq - 50}.each do |s|
    @requests.delete(s)
  end

  # FIXME: What is bit 8 for? Synthentic?
  type = data.unpack("C").first & 0x7f
  case type
  when 0 then read_error(data)
  when 1 then read_reply(data)
  when 2..34 then read_event(type, data, nil)
  else
    raise ProtocolError, "Unsupported reply type: #{type} #{data.inspect}"
  end
end

#read_reply(data) ⇒ Object 



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# File 'lib/X11/display.rb', line 95

def read_reply data
  len = data.unpack("@4L")[0]
  extra = len > 0 ? @socket.read(len*4) : ""
  #STDERR.puts "REPLY: #{data.inspect}"
  #STDERR.puts "EXTRA: #{extra.inspect}"
  data + extra
end

#render_add_glyphs(glyphset, glyphids, glyphinfos, data) ⇒ Object 



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# File 'lib/X11/display.rb', line 627

def render_add_glyphs(glyphset, glyphids, glyphinfos, data)
  write_request(X11::Form::XRenderAddGlyphs.new(render_opcode,
    glyphset, Array(glyphids), Array(glyphinfos), data))
end

#render_composite_glyphs32(op, src, dst, fmt, glyphset, srcx, srcy, *elts) ⇒ Object 



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# File 'lib/X11/display.rb', line 638

def render_composite_glyphs32(op, src, dst, fmt, glyphset, srcx,srcy, *elts)
  write_request(X11::Form::XRenderCompositeGlyphs32.new(
    render_opcode,
    op, src, dst, fmt,
    glyphset,
    srcx, srcy,
    elts.map {|e| e.is_a?(Array) ? Form::GlyphElt32.new(*e) : e }
  ))
end

#render_create_glyph_set(format) ⇒ Object 



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# File 'lib/X11/display.rb', line 620

def render_create_glyph_set(format)
  glyphset = new_id
  write_request(X11::Form::XRenderCreateGlyphSet.new(
    major_opcode("RENDER"),glyphset, format))
  glyphset
end

#render_create_picture(drawable, format, vmask = 0, vlist = []) ⇒ Object 



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# File 'lib/X11/display.rb', line 563

def render_create_picture(drawable, format, vmask=0, vlist=[])
  pid = new_id
  write_request(X11::Form::XRenderCreatePicture.new(
     render_opcode, pid, drawable, format, vmask, vlist))
  pid
end

#render_create_solid_fill(*color) ⇒ Object 



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# File 'lib/X11/display.rb', line 648

def render_create_solid_fill(*color)
  if color.length == 1 && color.is_a?(Form::XRenderColor)
    color = color[0]
  else
    color = Form::XRenderColor.new(*color)
  end
  fill = new_id
  write_request(Form::XRenderCreateSolidFill.new(render_opcode,fill,color))
  fill
end

#render_fill_rectangles(op, dst, color, rects) ⇒ Object 



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# File 'lib/X11/display.rb', line 632

def render_fill_rectangles(op, dst, color, rects)
  color = Form::XRenderColor.new(*color) if color.is_a?(Array)
  rects = rects.map{|r| r.is_a?(Array) ? Form::Rectangle.new(*r) : r}
  write_request(Form::XRenderFillRectangles.new(render_opcode, op, dst, color, rects))
end

#render_find_standard_format(sym) ⇒ Object 



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# File 'lib/X11/display.rb', line 586

def render_find_standard_format(sym)
  # A pox be on the people who made this necessary

  formats = render_query_pict_formats

  case sym
  when :a8
    @a8 ||= formats.formats.find do |f|
      f.type  == 1 &&
      f.depth == 8 &&
      f.direct.alpha_mask == 255
    end
  when :rgb24
    @rgb24 ||= formats.formats.find do |f|
      f.type         == 1  &&
      f.depth        == 24 &&
      f.direct.red   == 16 &&
      f.direct.green == 8  &&
      f.direct.blue  == 0
    end
  when :argb24
    @argb24 ||= formats.formats.find do |f|
      f.type         == 1  &&
      f.depth        == 32 &&
      f.direct.alpha == 24 &&
      f.direct.red   == 16 &&
      f.direct.green == 8  &&
      f.direct.blue  == 0
    end
  else
    raise "Unsupported format (a4/a1 by omission)"
  end
end

#render_find_visual_format(visual) ⇒ Object 



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# File 'lib/X11/display.rb', line 577

def render_find_visual_format(visual)
  # FIXME.
  render_query_pict_formats.screens.map do |s|
    s.depths.map do |d|
      d.visuals.map {|v| v.visual == visual ? v : nil }
    end
  end.flatten.compact.first&.format
end

#render_free_picture(picture) ⇒ Object 



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# File 'lib/X11/display.rb', line 659

def render_free_picture(picture)
  write_request(Form::XRenderFreePicture.new(render_opcode, picture))
end

#render_opcode ⇒ Object

XRender



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# File 'lib/X11/display.rb', line 551

def render_opcode
  return @render_opcode if @render_opcode
  @render_opcode = major_opcode("RENDER")
  if @render_opcode
    @render_version = write_sync(X11::Form::XRenderQueryVersion.new(
      @render_opcode,0,11),
      X11::Form::XRenderQueryVersionReply
    )
  end
  @render_opcode
end

#render_query_pict_formats ⇒ Object 



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# File 'lib/X11/display.rb', line 570

def render_query_pict_formats
  @render_formats ||= write_sync(
    Form::XRenderQueryPictFormats.new(render_opcode),
    Form::XRenderQueryPictFormatsReply
  )
end

#reparent_window(window, parent, x, y, save: true) ⇒ Object 



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# File 'lib/X11/display.rb', line 407

def reparent_window(window, parent, x, y, save: true)
  # You so almost always want this that it should've been a single request
  change_save_set(0, window) if save
  write_request(Form::ReparentWindow.new(window, parent, x,y))
end

#run ⇒ Object 



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# File 'lib/X11/display.rb', line 269

def run
  loop do
    pkt = next_packet
    return if !pkt
    yield(pkt)
  end
end

#screens ⇒ Object 



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# File 'lib/X11/display.rb', line 62

def screens
  @internal.screens.map do |s|
    Screen.new(self, s)
  end
end

#select_input(w, events) ⇒ Object 



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# File 'lib/X11/display.rb', line 321

def select_input(w, events) = change_window_attributes(w, values: {Form::CWEventMask => events})

#send_event ⇒ Object 



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# File 'lib/X11/display.rb', line 515

def send_event(...) = write_request(Form::SendEvent.new(...))

#set_input_focus(revert_to, focus, time = :now) ⇒ Object 



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# File 'lib/X11/display.rb', line 430

def set_input_focus(revert_to, focus, time=:now)
  # FIXME: This is an experiment.
  # Upside: Simpler. Downside: Doesn't work server-side.
  # Probably a bad idea.
  revert_to = open_enum(revert_to, {none: 0, pointer_root: 1, parent: 2})
  focus     = open_enum(focus,     {none: 0, pointer_root: 1 })
  time      = open_enum(time,      {current_time: 0, now: 0})
  write_packet(u8(42,revert_to), u16(3), window(focus), u32(time))
end

#set_value(values, mask, x) ⇒ Object 



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# File 'lib/X11/display.rb', line 461

def set_value(values, mask, x)
  if x
    values << x
    mask
  else
    0
  end
end

#start_io ⇒ Object 



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# File 'lib/X11/display.rb', line 208

def start_io
  @replies ||= {}
  @requests ||= {}
  # Read thread.
  # FIXME: Drop the select.
  rt = Thread.new do
    while pkt = read_packet
      #STDERR.puts "read: #{pkt.inspect}"
      if !pkt
        sleep 0.1
      elsif pkt.is_a?(String)
        # This is a reply. We need the sequence number.
        #
        seq = pkt.unpack1("@2S")
        STDERR.puts "  - seq= #{seq}" if @debug
        STDERR.puts @replies.inspect if @debug
        if @replies[seq]
          q = @replies.delete(seq)
          STDERR.puts "  - reply to #{q}" if @debug
          q << pkt
        end
      elsif pkt.is_a?(X11::Form::Error)
        if @replies[pkt.sequence_number]
          q = @replies.delete(pkt.sequence_number)
          q << pkt
        else
          @rqueue << pkt
        end
      else
        @rqueue << pkt
      end
    end
    @rqueue.close
    @replies.values.each(&:close)
  end

  # Write thread
  wt = Thread.new do
    while msg = @wqueue.shift
      ob, q, data = *msg
      @requests[@requestseq] = ob
      @replies[@requestseq] = q if q
      @requestseq = (@requestseq + 1) % 65536
      @socket.write(data)
    end
  end

  at_exit do
    flush
    @rqueue.close
    @wqueue.close
    # We kill this because it may be stuck in a read
    # we'll never care about
    Thread.kill(rt)
    
    # We wait for this to finish because otherwise we may
    # lose side-effects
    wt.join
  end
end

#u16(*args) ⇒ Object 



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# File 'lib/X11/display.rb', line 417

def u16(*args) = args.pack("v*")

#u32(*args) ⇒ Object 



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# File 'lib/X11/display.rb', line 418

def u32(*args) = args.pack("V*")

#u8(*args) ⇒ Object 



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# File 'lib/X11/display.rb', line 416

def u8(*args)  = args.pack("c*")

#unmap_window ⇒ Object 



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# File 'lib/X11/display.rb', line 414

def unmap_window(...) = write_request(Form::UnmapWindow.new(...))

#window(*args) ⇒ Object 



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# File 'lib/X11/display.rb', line 423

def window(*args)
  args.each {|a| raise "Window expected" if a.nil? }
  u32(*args)
end

#write_packet(*args) ⇒ Object 



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# File 'lib/X11/display.rb', line 178

def write_packet(*args)
  pkt = args.join
  pkt[2..3] = u16(pkt.length/4)
  @wqueue << [nil,nil,pkt]
end

#write_request(ob) ⇒ Object 



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# File 'lib/X11/display.rb', line 184

def write_request ob
  data = ob.to_packet(self) if ob.respond_to?(:to_packet)
  raise "BAD LENGTH for #{ob.inspect} (#{ob.request_length.to_i*4} ! #{data.size} " if ob.request_length && ob.request_length.to_i*4 != data.size
  STDERR.puts "write_req: #{ob.inspect}" if @debug
  @wqueue << [ob,nil,data]
end

#write_sync(ob, reply = nil) ⇒ Object

Raises:



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# File 'lib/X11/display.rb', line 191

def write_sync(ob, reply=nil)
  data = ob.to_packet(self) if ob.respond_to?(:to_packet)
  q = Queue.new
  @wqueue << [ob,q,data]
  STDERR.puts "write_sync_req: #{ob.inspect}" if @debug
  pkt = q.shift
  STDERR.puts "write_sync_rep: #{pkt.inspect}" if @debug
  raise(X11::Error.new(pkt)) if pkt.is_a?(X11::Form::Error)
  return pkt if !pkt.is_a?(String)
  reply ? reply.from_packet(StringIO.new(pkt)) : pkt
end