1 /*
2  *  Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #include "modules/desktop_capture/linux/x_window_property.h"
12 
13 namespace webrtc {
14 
XWindowPropertyBase(Display * display,Window window,Atom property,int expected_size)15 XWindowPropertyBase::XWindowPropertyBase(Display* display,
16                                          Window window,
17                                          Atom property,
18                                          int expected_size) {
19   const int kBitsPerByte = 8;
20   Atom actual_type;
21   int actual_format;
22   unsigned long bytes_after;  // NOLINT: type required by XGetWindowProperty
23   int status = XGetWindowProperty(display, window, property, 0L, ~0L, False,
24                                   AnyPropertyType, &actual_type, &actual_format,
25                                   &size_, &bytes_after, &data_);
26   if (status != Success) {
27     data_ = nullptr;
28     return;
29   }
30   if ((expected_size * kBitsPerByte) != actual_format) {
31     size_ = 0;
32     return;
33   }
34 
35   is_valid_ = true;
36 }
37 
~XWindowPropertyBase()38 XWindowPropertyBase::~XWindowPropertyBase() {
39   if (data_)
40     XFree(data_);
41 }
42 
43 }  // namespace webrtc
44