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"""
LDTP v2 Core Generic.

@author: Eitan Isaacson <eitan@ascender.com>
@author: Nagappan Alagappan <nagappan@gmail.com>
@copyright: Copyright (c) 2009 Eitan Isaacson
@copyright: Copyright (c) 2009-12 Nagappan Alagappan
@license: LGPL

http://ldtp.freedesktop.org

This file may be distributed and/or modified under the terms of the GNU Lesser General
Public License version 2 as published by the Free Software Foundation. This file
is distributed without any warranty; without even the implied warranty of 
merchantability or fitness for a particular purpose.

See 'COPYING' in the source distribution for more information.

Headers in this file shall remain intact.
"""

import gc
import os
try:
  # If we have gtk3+ gobject introspection, use that
  from gi.repository import Wnck as wnck, Gtk as gtk, Gdk as gdk
  gtk3 = True
except:
  # No gobject introspection, use gtk2 libwnck
  import gtk
  import wnck
  gtk3 = False
import pyatspi 
import tempfile
from base64 import b64encode

from utils import Utils
from server_exception import LdtpServerException

class Generic(Utils):
    def imagecapture(self, window_name = None, x = 0, y = 0,
                     width = None, height = None):
        """
        Captures screenshot of the whole desktop or given window
        
        @param window_name: Window name to look for, either full name,
        LDTP's name convention, or a Unix glob.
        @type window_name: string
        @param x: x co-ordinate value
        @type x: int
        @param y: y co-ordinate value
        @type y: int
        @param width: width co-ordinate value
        @type width: int
        @param height: height co-ordinate value
        @type height: int

        @return: screenshot with base64 encoded for the client
        @rtype: string
        """
        if window_name:
            acc = None
            for gui in self._list_guis():
                if self._match_name_to_acc(window_name, gui):
                    if 'Component' in pyatspi.listInterfaces(gui):
                        acc = gui
                        for obj in self._list_objects(gui):
                            role = obj.getRole()
                            if role == pyatspi.ROLE_CHECK_BOX or \
                                    role == pyatspi.ROLE_PUSH_BUTTON or \
                                    role == pyatspi.ROLE_RADIO_BUTTON:
                                try:
                                    # Try to grab focus
                                    self._grab_focus(obj)
                                except:
                                    pass
                                # Inner for loop
                                break
                        # Outer for loop
                        break
            if not acc:
                raise LdtpServerException('No window matches %s' % window_name)
            icomponent = acc.queryComponent()
            bb = icomponent.getExtents(pyatspi.DESKTOP_COORDS)
            x, y, height, width = bb.x, bb.y, bb.height, bb.width

        tmpFile = tempfile.mktemp('.png', 'ldtpd_')
        if gtk3:
           window = gdk.get_default_root_window()
           tmp_size = window.get_geometry()
           size = []
           # Width
           size.append(tmp_size[2])
           # Height
           size.append(tmp_size[3])
           pb = gdk.pixbuf_get_from_window(window, x, y, width or size[0],
                                           height or size[1])
           pb.savev(tmpFile, 'png', [], [])
           del pb
           gc.collect()
        else:
           window = gtk.gdk.get_default_root_window()
           size = window.get_size()
           pb = gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB, False, 8, 
                               width or size [0], 
                               height or size [1])
           pb = pb.get_from_drawable(window, window.get_colormap(),
                                      x, y, 0, 0, 
                                      width or size [0], 
                                      height or size [1])

           if pb:
              pb.save(tmpFile, 'png')
              del pb
              gc.collect()
        rv = b64encode(open(tmpFile).read())
        os.remove(tmpFile)
        return rv