x_window_property.h (2044B)
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 #ifndef MODULES_DESKTOP_CAPTURE_LINUX_X11_X_WINDOW_PROPERTY_H_ 12 #define MODULES_DESKTOP_CAPTURE_LINUX_X11_X_WINDOW_PROPERTY_H_ 13 14 #include <X11/X.h> 15 #include <X11/Xlib.h> 16 17 #include <cstddef> 18 19 namespace webrtc { 20 21 class XWindowPropertyBase { 22 public: 23 XWindowPropertyBase(Display* display, 24 Window window, 25 Atom property, 26 int expected_size); 27 virtual ~XWindowPropertyBase(); 28 29 XWindowPropertyBase(const XWindowPropertyBase&) = delete; 30 XWindowPropertyBase& operator=(const XWindowPropertyBase&) = delete; 31 32 // True if we got properly value successfully. 33 bool is_valid() const { return is_valid_; } 34 35 // Size and value of the property. 36 size_t size() const { return size_; } 37 38 protected: 39 unsigned char* data_ = nullptr; 40 41 private: 42 bool is_valid_ = false; 43 unsigned long size_ = 0; // NOLINT: type required by XGetWindowProperty 44 }; 45 46 // Convenience wrapper for XGetWindowProperty() results. 47 template <class PropertyType> 48 class XWindowProperty : public XWindowPropertyBase { 49 public: 50 XWindowProperty(Display* display, const Window window, const Atom property) 51 : XWindowPropertyBase(display, window, property, sizeof(PropertyType)) {} 52 ~XWindowProperty() override = default; 53 54 XWindowProperty(const XWindowProperty&) = delete; 55 XWindowProperty& operator=(const XWindowProperty&) = delete; 56 57 const PropertyType* data() const { 58 return reinterpret_cast<PropertyType*>(data_); 59 } 60 PropertyType* data() { return reinterpret_cast<PropertyType*>(data_); } 61 }; 62 63 } // namespace webrtc 64 65 #endif // MODULES_DESKTOP_CAPTURE_LINUX_X11_X_WINDOW_PROPERTY_H_