Repo created

TMessagesProj/jni/voip/webrtc/modules/desktop_capture/linux/x11/mouse_cursor_monitor_x11.cc

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+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "modules/desktop_capture/linux/x11/mouse_cursor_monitor_x11.h"
+
+#include <X11/Xlib.h>
+#include <X11/extensions/Xfixes.h>
+#include <X11/extensions/xfixeswire.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#include <algorithm>
+#include <memory>
+
+#include "modules/desktop_capture/desktop_capture_options.h"
+#include "modules/desktop_capture/desktop_capture_types.h"
+#include "modules/desktop_capture/desktop_frame.h"
+#include "modules/desktop_capture/desktop_geometry.h"
+#include "modules/desktop_capture/linux/x11/x_error_trap.h"
+#include "modules/desktop_capture/mouse_cursor.h"
+#include "modules/desktop_capture/mouse_cursor_monitor.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/logging.h"
+
+namespace {
+
+// WindowCapturer returns window IDs of X11 windows with WM_STATE attribute.
+// These windows may not be immediate children of the root window, because
+// window managers may re-parent them to add decorations. However,
+// XQueryPointer() expects to be passed children of the root. This function
+// searches up the list of the windows to find the root child that corresponds
+// to `window`.
+Window GetTopLevelWindow(Display* display, Window window) {
+  while (true) {
+    // If the window is in WithdrawnState then look at all of its children.
+    ::Window root, parent;
+    ::Window* children;
+    unsigned int num_children;
+    if (!XQueryTree(display, window, &root, &parent, &children,
+                    &num_children)) {
+      RTC_LOG(LS_ERROR) << "Failed to query for child windows although window"
+                           "does not have a valid WM_STATE.";
+      return None;
+    }
+    if (children)
+      XFree(children);
+
+    if (parent == root)
+      break;
+
+    window = parent;
+  }
+
+  return window;
+}
+
+}  // namespace
+
+namespace webrtc {
+
+MouseCursorMonitorX11::MouseCursorMonitorX11(
+    const DesktopCaptureOptions& options,
+    Window window)
+    : x_display_(options.x_display()),
+      callback_(NULL),
+      mode_(SHAPE_AND_POSITION),
+      window_(window),
+      have_xfixes_(false),
+      xfixes_event_base_(-1),
+      xfixes_error_base_(-1) {
+  // Set a default initial cursor shape in case XFixes is not present.
+  const int kSize = 5;
+  std::unique_ptr<DesktopFrame> default_cursor(
+      new BasicDesktopFrame(DesktopSize(kSize, kSize)));
+  const uint8_t pixels[kSize * kSize] = {
+      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff,
+      0x00, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00, 0xff, 0xff,
+      0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+  uint8_t* ptr = default_cursor->data();
+  for (int y = 0; y < kSize; ++y) {
+    for (int x = 0; x < kSize; ++x) {
+      *ptr++ = pixels[kSize * y + x];
+      *ptr++ = pixels[kSize * y + x];
+      *ptr++ = pixels[kSize * y + x];
+      *ptr++ = 0xff;
+    }
+  }
+  DesktopVector hotspot(2, 2);
+  cursor_shape_.reset(new MouseCursor(default_cursor.release(), hotspot));
+}
+
+MouseCursorMonitorX11::~MouseCursorMonitorX11() {
+  if (have_xfixes_) {
+    x_display_->RemoveEventHandler(xfixes_event_base_ + XFixesCursorNotify,
+                                   this);
+  }
+}
+
+void MouseCursorMonitorX11::Init(Callback* callback, Mode mode) {
+  // Init can be called only once per instance of MouseCursorMonitor.
+  RTC_DCHECK(!callback_);
+  RTC_DCHECK(callback);
+
+  callback_ = callback;
+  mode_ = mode;
+
+  have_xfixes_ =
+      XFixesQueryExtension(display(), &xfixes_event_base_, &xfixes_error_base_);
+
+  if (have_xfixes_) {
+    // Register for changes to the cursor shape.
+    XFixesSelectCursorInput(display(), window_, XFixesDisplayCursorNotifyMask);
+    x_display_->AddEventHandler(xfixes_event_base_ + XFixesCursorNotify, this);
+
+    CaptureCursor();
+  } else {
+    RTC_LOG(LS_INFO) << "X server does not support XFixes.";
+  }
+}
+
+void MouseCursorMonitorX11::Capture() {
+  RTC_DCHECK(callback_);
+
+  // Process X11 events in case XFixes has sent cursor notification.
+  x_display_->ProcessPendingXEvents();
+
+  // cursor_shape_| is set only if we were notified of a cursor shape change.
+  if (cursor_shape_.get())
+    callback_->OnMouseCursor(cursor_shape_.release());
+
+  // Get cursor position if necessary.
+  if (mode_ == SHAPE_AND_POSITION) {
+    int root_x;
+    int root_y;
+    int win_x;
+    int win_y;
+    Window root_window;
+    Window child_window;
+    unsigned int mask;
+
+    CursorState state;
+    {
+      XErrorTrap error_trap(display());
+      Bool result =
+          XQueryPointer(display(), window_, &root_window, &child_window,
+                        &root_x, &root_y, &win_x, &win_y, &mask);
+      if (!result || error_trap.GetLastErrorAndDisable() != 0) {
+        state = OUTSIDE;
+      } else {
+        // In screen mode (window_ == root_window) the mouse is always inside.
+        // XQueryPointer() sets `child_window` to None if the cursor is outside
+        // `window_`.
+        state =
+            (window_ == root_window || child_window != None) ? INSIDE : OUTSIDE;
+      }
+    }
+
+    // As the comments to GetTopLevelWindow() above indicate, in window capture,
+    // the cursor position capture happens in `window_`, while the frame catpure
+    // happens in `child_window`. These two windows are not alwyas same, as
+    // window manager may add some decorations to the `window_`. So translate
+    // the coordinate in `window_` to the coordinate space of `child_window`.
+    if (window_ != root_window && state == INSIDE) {
+      int translated_x, translated_y;
+      Window unused;
+      if (XTranslateCoordinates(display(), window_, child_window, win_x, win_y,
+                                &translated_x, &translated_y, &unused)) {
+        win_x = translated_x;
+        win_y = translated_y;
+      }
+    }
+
+    // X11 always starts the coordinate from (0, 0), so we do not need to
+    // translate here.
+    callback_->OnMouseCursorPosition(DesktopVector(root_x, root_y));
+  }
+}
+
+bool MouseCursorMonitorX11::HandleXEvent(const XEvent& event) {
+  if (have_xfixes_ && event.type == xfixes_event_base_ + XFixesCursorNotify) {
+    const XFixesCursorNotifyEvent* cursor_event =
+        reinterpret_cast<const XFixesCursorNotifyEvent*>(&event);
+    if (cursor_event->subtype == XFixesDisplayCursorNotify) {
+      CaptureCursor();
+    }
+    // Return false, even if the event has been handled, because there might be
+    // other listeners for cursor notifications.
+  }
+  return false;
+}
+
+void MouseCursorMonitorX11::CaptureCursor() {
+  RTC_DCHECK(have_xfixes_);
+
+  XFixesCursorImage* img;
+  {
+    XErrorTrap error_trap(display());
+    img = XFixesGetCursorImage(display());
+    if (!img || error_trap.GetLastErrorAndDisable() != 0)
+      return;
+  }
+
+  std::unique_ptr<DesktopFrame> image(
+      new BasicDesktopFrame(DesktopSize(img->width, img->height)));
+
+  // Xlib stores 32-bit data in longs, even if longs are 64-bits long.
+  unsigned long* src = img->pixels;  // NOLINT(runtime/int)
+  uint32_t* dst = reinterpret_cast<uint32_t*>(image->data());
+  uint32_t* dst_end = dst + (img->width * img->height);
+  while (dst < dst_end) {
+    *dst++ = static_cast<uint32_t>(*src++);
+  }
+
+  DesktopVector hotspot(std::min(img->width, img->xhot),
+                        std::min(img->height, img->yhot));
+
+  XFree(img);
+
+  cursor_shape_.reset(new MouseCursor(image.release(), hotspot));
+}
+
+// static
+MouseCursorMonitor* MouseCursorMonitorX11::CreateForWindow(
+    const DesktopCaptureOptions& options,
+    WindowId window) {
+  if (!options.x_display())
+    return NULL;
+  window = GetTopLevelWindow(options.x_display()->display(), window);
+  if (window == None)
+    return NULL;
+  return new MouseCursorMonitorX11(options, window);
+}
+
+MouseCursorMonitor* MouseCursorMonitorX11::CreateForScreen(
+    const DesktopCaptureOptions& options,
+    ScreenId screen) {
+  if (!options.x_display())
+    return NULL;
+  return new MouseCursorMonitorX11(
+      options, DefaultRootWindow(options.x_display()->display()));
+}
+
+std::unique_ptr<MouseCursorMonitor> MouseCursorMonitorX11::Create(
+    const DesktopCaptureOptions& options) {
+  return std::unique_ptr<MouseCursorMonitor>(
+      CreateForScreen(options, kFullDesktopScreenId));
+}
+
+}  // namespace webrtc

TMessagesProj/jni/voip/webrtc/modules/desktop_capture/linux/x11/mouse_cursor_monitor_x11.h

@@ -0,0 +1,68 @@
+/*
+ *  Copyright 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef MODULES_DESKTOP_CAPTURE_LINUX_X11_MOUSE_CURSOR_MONITOR_X11_H_
+#define MODULES_DESKTOP_CAPTURE_LINUX_X11_MOUSE_CURSOR_MONITOR_X11_H_
+
+#include <X11/X.h>
+
+#include <memory>
+
+#include "api/scoped_refptr.h"
+#include "modules/desktop_capture/desktop_capture_options.h"
+#include "modules/desktop_capture/desktop_capture_types.h"
+#include "modules/desktop_capture/linux/x11/shared_x_display.h"
+#include "modules/desktop_capture/mouse_cursor.h"
+#include "modules/desktop_capture/mouse_cursor_monitor.h"
+
+namespace webrtc {
+
+class MouseCursorMonitorX11 : public MouseCursorMonitor,
+                              public SharedXDisplay::XEventHandler {
+ public:
+  MouseCursorMonitorX11(const DesktopCaptureOptions& options, Window window);
+  ~MouseCursorMonitorX11() override;
+
+  static MouseCursorMonitor* CreateForWindow(
+      const DesktopCaptureOptions& options,
+      WindowId window);
+  static MouseCursorMonitor* CreateForScreen(
+      const DesktopCaptureOptions& options,
+      ScreenId screen);
+  static std::unique_ptr<MouseCursorMonitor> Create(
+      const DesktopCaptureOptions& options);
+
+  void Init(Callback* callback, Mode mode) override;
+  void Capture() override;
+
+ private:
+  // SharedXDisplay::XEventHandler interface.
+  bool HandleXEvent(const XEvent& event) override;
+
+  Display* display() { return x_display_->display(); }
+
+  // Captures current cursor shape and stores it in `cursor_shape_`.
+  void CaptureCursor();
+
+  rtc::scoped_refptr<SharedXDisplay> x_display_;
+  Callback* callback_;
+  Mode mode_;
+  Window window_;
+
+  bool have_xfixes_;
+  int xfixes_event_base_;
+  int xfixes_error_base_;
+
+  std::unique_ptr<MouseCursor> cursor_shape_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_LINUX_X11_MOUSE_CURSOR_MONITOR_X11_H_

TMessagesProj/jni/voip/webrtc/modules/desktop_capture/linux/x11/screen_capturer_x11.cc

@@ -0,0 +1,517 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "modules/desktop_capture/linux/x11/screen_capturer_x11.h"
+
+#include <X11/Xlib.h>
+#include <X11/extensions/Xdamage.h>
+#include <X11/extensions/Xfixes.h>
+#include <X11/extensions/damagewire.h>
+#include <dlfcn.h>
+#include <stdint.h>
+#include <string.h>
+
+#include <memory>
+#include <utility>
+
+#include "modules/desktop_capture/desktop_capture_options.h"
+#include "modules/desktop_capture/desktop_capturer.h"
+#include "modules/desktop_capture/desktop_frame.h"
+#include "modules/desktop_capture/desktop_geometry.h"
+#include "modules/desktop_capture/linux/x11/x_server_pixel_buffer.h"
+#include "modules/desktop_capture/screen_capture_frame_queue.h"
+#include "modules/desktop_capture/screen_capturer_helper.h"
+#include "modules/desktop_capture/shared_desktop_frame.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/logging.h"
+#include "rtc_base/sanitizer.h"
+#include "rtc_base/time_utils.h"
+#include "rtc_base/trace_event.h"
+
+namespace webrtc {
+
+ScreenCapturerX11::ScreenCapturerX11() {
+  helper_.SetLogGridSize(4);
+}
+
+ScreenCapturerX11::~ScreenCapturerX11() {
+  options_.x_display()->RemoveEventHandler(ConfigureNotify, this);
+  if (use_damage_) {
+    options_.x_display()->RemoveEventHandler(damage_event_base_ + XDamageNotify,
+                                             this);
+  }
+  if (use_randr_) {
+    options_.x_display()->RemoveEventHandler(
+        randr_event_base_ + RRScreenChangeNotify, this);
+  }
+  DeinitXlib();
+}
+
+bool ScreenCapturerX11::Init(const DesktopCaptureOptions& options) {
+  TRACE_EVENT0("webrtc", "ScreenCapturerX11::Init");
+  options_ = options;
+
+  atom_cache_ = std::make_unique<XAtomCache>(display());
+
+  root_window_ = RootWindow(display(), DefaultScreen(display()));
+  if (root_window_ == BadValue) {
+    RTC_LOG(LS_ERROR) << "Unable to get the root window";
+    DeinitXlib();
+    return false;
+  }
+
+  gc_ = XCreateGC(display(), root_window_, 0, NULL);
+  if (gc_ == NULL) {
+    RTC_LOG(LS_ERROR) << "Unable to get graphics context";
+    DeinitXlib();
+    return false;
+  }
+
+  options_.x_display()->AddEventHandler(ConfigureNotify, this);
+
+  // Check for XFixes extension. This is required for cursor shape
+  // notifications, and for our use of XDamage.
+  if (XFixesQueryExtension(display(), &xfixes_event_base_,
+                           &xfixes_error_base_)) {
+    has_xfixes_ = true;
+  } else {
+    RTC_LOG(LS_INFO) << "X server does not support XFixes.";
+  }
+
+  // Register for changes to the dimensions of the root window.
+  XSelectInput(display(), root_window_, StructureNotifyMask);
+
+  if (!x_server_pixel_buffer_.Init(atom_cache_.get(),
+                                   DefaultRootWindow(display()))) {
+    RTC_LOG(LS_ERROR) << "Failed to initialize pixel buffer.";
+    return false;
+  }
+
+  if (options_.use_update_notifications()) {
+    InitXDamage();
+  }
+
+  InitXrandr();
+
+  // Default source set here so that selected_monitor_rect_ is sized correctly.
+  SelectSource(kFullDesktopScreenId);
+
+  return true;
+}
+
+void ScreenCapturerX11::InitXDamage() {
+  // Our use of XDamage requires XFixes.
+  if (!has_xfixes_) {
+    return;
+  }
+
+  // Check for XDamage extension.
+  if (!XDamageQueryExtension(display(), &damage_event_base_,
+                             &damage_error_base_)) {
+    RTC_LOG(LS_INFO) << "X server does not support XDamage.";
+    return;
+  }
+
+  // TODO(lambroslambrou): Disable DAMAGE in situations where it is known
+  // to fail, such as when Desktop Effects are enabled, with graphics
+  // drivers (nVidia, ATI) that fail to report DAMAGE notifications
+  // properly.
+
+  // Request notifications every time the screen becomes damaged.
+  damage_handle_ =
+      XDamageCreate(display(), root_window_, XDamageReportNonEmpty);
+  if (!damage_handle_) {
+    RTC_LOG(LS_ERROR) << "Unable to initialize XDamage.";
+    return;
+  }
+
+  // Create an XFixes server-side region to collate damage into.
+  damage_region_ = XFixesCreateRegion(display(), 0, 0);
+  if (!damage_region_) {
+    XDamageDestroy(display(), damage_handle_);
+    RTC_LOG(LS_ERROR) << "Unable to create XFixes region.";
+    return;
+  }
+
+  options_.x_display()->AddEventHandler(damage_event_base_ + XDamageNotify,
+                                        this);
+
+  use_damage_ = true;
+  RTC_LOG(LS_INFO) << "Using XDamage extension.";
+}
+
+RTC_NO_SANITIZE("cfi-icall")
+void ScreenCapturerX11::InitXrandr() {
+  int major_version = 0;
+  int minor_version = 0;
+  int error_base_ignored = 0;
+  if (XRRQueryExtension(display(), &randr_event_base_, &error_base_ignored) &&
+      XRRQueryVersion(display(), &major_version, &minor_version)) {
+    if (major_version > 1 || (major_version == 1 && minor_version >= 5)) {
+      // Dynamically link XRRGetMonitors and XRRFreeMonitors as a workaround
+      // to avoid a dependency issue with Debian 8.
+      get_monitors_ = reinterpret_cast<get_monitors_func>(
+          dlsym(RTLD_DEFAULT, "XRRGetMonitors"));
+      free_monitors_ = reinterpret_cast<free_monitors_func>(
+          dlsym(RTLD_DEFAULT, "XRRFreeMonitors"));
+      if (get_monitors_ && free_monitors_) {
+        use_randr_ = true;
+        RTC_LOG(LS_INFO) << "Using XRandR extension v" << major_version << '.'
+                         << minor_version << '.';
+        monitors_ =
+            get_monitors_(display(), root_window_, true, &num_monitors_);
+
+        // Register for screen change notifications
+        XRRSelectInput(display(), root_window_, RRScreenChangeNotifyMask);
+        options_.x_display()->AddEventHandler(
+            randr_event_base_ + RRScreenChangeNotify, this);
+      } else {
+        RTC_LOG(LS_ERROR) << "Unable to link XRandR monitor functions.";
+      }
+    } else {
+      RTC_LOG(LS_ERROR) << "XRandR entension is older than v1.5.";
+    }
+  } else {
+    RTC_LOG(LS_ERROR) << "X server does not support XRandR.";
+  }
+}
+
+RTC_NO_SANITIZE("cfi-icall")
+void ScreenCapturerX11::UpdateMonitors() {
+  // The queue should be reset whenever |selected_monitor_rect_| changes, so
+  // that the DCHECKs in CaptureScreen() are satisfied.
+  queue_.Reset();
+
+  if (monitors_) {
+    free_monitors_(monitors_);
+    monitors_ = nullptr;
+  }
+
+  monitors_ = get_monitors_(display(), root_window_, true, &num_monitors_);
+
+  if (selected_monitor_name_) {
+    if (selected_monitor_name_ == static_cast<Atom>(kFullDesktopScreenId)) {
+      selected_monitor_rect_ =
+          DesktopRect::MakeSize(x_server_pixel_buffer_.window_size());
+      return;
+    }
+
+    for (int i = 0; i < num_monitors_; ++i) {
+      XRRMonitorInfo& m = monitors_[i];
+      if (selected_monitor_name_ == m.name) {
+        RTC_LOG(LS_INFO) << "XRandR monitor " << m.name << " rect updated.";
+        selected_monitor_rect_ =
+            DesktopRect::MakeXYWH(m.x, m.y, m.width, m.height);
+        const auto& pixel_buffer_rect = x_server_pixel_buffer_.window_rect();
+        if (!pixel_buffer_rect.ContainsRect(selected_monitor_rect_)) {
+          // This is never expected to happen, but crop the rectangle anyway
+          // just in case the server returns inconsistent information.
+          // CaptureScreen() expects `selected_monitor_rect_` to lie within
+          // the pixel-buffer's rectangle.
+          RTC_LOG(LS_WARNING)
+              << "Cropping selected monitor rect to fit the pixel-buffer.";
+          selected_monitor_rect_.IntersectWith(pixel_buffer_rect);
+        }
+        return;
+      }
+    }
+
+    // The selected monitor is not connected anymore
+    RTC_LOG(LS_INFO) << "XRandR selected monitor " << selected_monitor_name_
+                     << " lost.";
+    selected_monitor_rect_ = DesktopRect::MakeWH(0, 0);
+  }
+}
+
+void ScreenCapturerX11::Start(Callback* callback) {
+  RTC_DCHECK(!callback_);
+  RTC_DCHECK(callback);
+
+  callback_ = callback;
+}
+
+void ScreenCapturerX11::CaptureFrame() {
+  TRACE_EVENT0("webrtc", "ScreenCapturerX11::CaptureFrame");
+  int64_t capture_start_time_nanos = rtc::TimeNanos();
+
+  queue_.MoveToNextFrame();
+  if (queue_.current_frame() && queue_.current_frame()->IsShared()) {
+    RTC_DLOG(LS_WARNING) << "Overwriting frame that is still shared.";
+  }
+
+  // Process XEvents for XDamage and cursor shape tracking.
+  options_.x_display()->ProcessPendingXEvents();
+
+  // ProcessPendingXEvents() may call ScreenConfigurationChanged() which
+  // reinitializes `x_server_pixel_buffer_`. Check if the pixel buffer is still
+  // in a good shape.
+  if (!x_server_pixel_buffer_.is_initialized()) {
+    // We failed to initialize pixel buffer.
+    RTC_LOG(LS_ERROR) << "Pixel buffer is not initialized.";
+    callback_->OnCaptureResult(Result::ERROR_PERMANENT, nullptr);
+    return;
+  }
+
+  // Allocate the current frame buffer only if it is not already allocated.
+  // Note that we can't reallocate other buffers at this point, since the caller
+  // may still be reading from them.
+  if (!queue_.current_frame()) {
+    std::unique_ptr<DesktopFrame> frame(
+        new BasicDesktopFrame(selected_monitor_rect_.size()));
+
+    // We set the top-left of the frame so the mouse cursor will be composited
+    // properly, and our frame buffer will not be overrun while blitting.
+    frame->set_top_left(selected_monitor_rect_.top_left());
+    queue_.ReplaceCurrentFrame(SharedDesktopFrame::Wrap(std::move(frame)));
+  }
+
+  std::unique_ptr<DesktopFrame> result = CaptureScreen();
+  if (!result) {
+    RTC_LOG(LS_WARNING) << "Temporarily failed to capture screen.";
+    callback_->OnCaptureResult(Result::ERROR_TEMPORARY, nullptr);
+    return;
+  }
+
+  last_invalid_region_ = result->updated_region();
+  result->set_capture_time_ms((rtc::TimeNanos() - capture_start_time_nanos) /
+                              rtc::kNumNanosecsPerMillisec);
+  result->set_capturer_id(DesktopCapturerId::kX11CapturerLinux);
+  callback_->OnCaptureResult(Result::SUCCESS, std::move(result));
+}
+
+bool ScreenCapturerX11::GetSourceList(SourceList* sources) {
+  RTC_DCHECK(sources->size() == 0);
+  if (!use_randr_) {
+    sources->push_back({});
+    return true;
+  }
+
+  // Ensure that `monitors_` is updated with changes that may have happened
+  // between calls to GetSourceList().
+  options_.x_display()->ProcessPendingXEvents();
+
+  for (int i = 0; i < num_monitors_; ++i) {
+    XRRMonitorInfo& m = monitors_[i];
+    char* monitor_title = XGetAtomName(display(), m.name);
+
+    // Note name is an X11 Atom used to id the monitor.
+    sources->push_back({static_cast<SourceId>(m.name), monitor_title});
+    XFree(monitor_title);
+  }
+
+  return true;
+}
+
+bool ScreenCapturerX11::SelectSource(SourceId id) {
+  // Prevent the reuse of any frame buffers allocated for a previously selected
+  // source. This is required to stop crashes, or old data from appearing in
+  // a captured frame, when the new source is sized differently then the source
+  // that was selected at the time a reused frame buffer was created.
+  queue_.Reset();
+
+  if (!use_randr_ || id == kFullDesktopScreenId) {
+    selected_monitor_name_ = kFullDesktopScreenId;
+    selected_monitor_rect_ =
+        DesktopRect::MakeSize(x_server_pixel_buffer_.window_size());
+    return true;
+  }
+
+  for (int i = 0; i < num_monitors_; ++i) {
+    if (id == static_cast<SourceId>(monitors_[i].name)) {
+      RTC_LOG(LS_INFO) << "XRandR selected source: " << id;
+      XRRMonitorInfo& m = monitors_[i];
+      selected_monitor_name_ = m.name;
+      selected_monitor_rect_ =
+          DesktopRect::MakeXYWH(m.x, m.y, m.width, m.height);
+      const auto& pixel_buffer_rect = x_server_pixel_buffer_.window_rect();
+      if (!pixel_buffer_rect.ContainsRect(selected_monitor_rect_)) {
+        RTC_LOG(LS_WARNING)
+            << "Cropping selected monitor rect to fit the pixel-buffer.";
+        selected_monitor_rect_.IntersectWith(pixel_buffer_rect);
+      }
+      return true;
+    }
+  }
+  return false;
+}
+
+bool ScreenCapturerX11::HandleXEvent(const XEvent& event) {
+  if (use_damage_ && (event.type == damage_event_base_ + XDamageNotify)) {
+    const XDamageNotifyEvent* damage_event =
+        reinterpret_cast<const XDamageNotifyEvent*>(&event);
+    if (damage_event->damage != damage_handle_)
+      return false;
+    RTC_DCHECK(damage_event->level == XDamageReportNonEmpty);
+    return true;
+  } else if (use_randr_ &&
+             event.type == randr_event_base_ + RRScreenChangeNotify) {
+    XRRUpdateConfiguration(const_cast<XEvent*>(&event));
+    UpdateMonitors();
+    RTC_LOG(LS_INFO) << "XRandR screen change event received.";
+    return false;
+  } else if (event.type == ConfigureNotify) {
+    ScreenConfigurationChanged();
+    return false;
+  }
+  return false;
+}
+
+std::unique_ptr<DesktopFrame> ScreenCapturerX11::CaptureScreen() {
+  std::unique_ptr<SharedDesktopFrame> frame = queue_.current_frame()->Share();
+  RTC_DCHECK(selected_monitor_rect_.size().equals(frame->size()));
+  RTC_DCHECK(selected_monitor_rect_.top_left().equals(frame->top_left()));
+
+  // Pass the screen size to the helper, so it can clip the invalid region if it
+  // expands that region to a grid. Note that the helper operates in the
+  // DesktopFrame coordinate system where the top-left pixel is (0, 0), even for
+  // a monitor with non-zero offset relative to `x_server_pixel_buffer_`.
+  helper_.set_size_most_recent(frame->size());
+
+  // In the DAMAGE case, ensure the frame is up-to-date with the previous frame
+  // if any.  If there isn't a previous frame, that means a screen-resolution
+  // change occurred, and `invalid_rects` will be updated to include the whole
+  // screen.
+  if (use_damage_ && queue_.previous_frame())
+    SynchronizeFrame();
+
+  DesktopRegion* updated_region = frame->mutable_updated_region();
+
+  x_server_pixel_buffer_.Synchronize();
+  if (use_damage_ && queue_.previous_frame()) {
+    // Atomically fetch and clear the damage region.
+    XDamageSubtract(display(), damage_handle_, None, damage_region_);
+    int rects_num = 0;
+    XRectangle bounds;
+    XRectangle* rects = XFixesFetchRegionAndBounds(display(), damage_region_,
+                                                   &rects_num, &bounds);
+    for (int i = 0; i < rects_num; ++i) {
+      auto damage_rect = DesktopRect::MakeXYWH(rects[i].x, rects[i].y,
+                                               rects[i].width, rects[i].height);
+
+      // Damage-regions are relative to `x_server_pixel_buffer`, so convert the
+      // region to DesktopFrame coordinates where the top-left is always (0, 0),
+      // before adding to the frame's updated_region. `helper_` also operates in
+      // DesktopFrame coordinates, and it will take care of cropping away any
+      // damage-regions that lie outside the selected monitor.
+      damage_rect.Translate(-frame->top_left());
+      updated_region->AddRect(damage_rect);
+    }
+    XFree(rects);
+    helper_.InvalidateRegion(*updated_region);
+
+    // Capture the damaged portions of the desktop.
+    helper_.TakeInvalidRegion(updated_region);
+
+    for (DesktopRegion::Iterator it(*updated_region); !it.IsAtEnd();
+         it.Advance()) {
+      auto rect = it.rect();
+      rect.Translate(frame->top_left());
+      if (!x_server_pixel_buffer_.CaptureRect(rect, frame.get()))
+        return nullptr;
+    }
+  } else {
+    // Doing full-screen polling, or this is the first capture after a
+    // screen-resolution change.  In either case, need a full-screen capture.
+    if (!x_server_pixel_buffer_.CaptureRect(selected_monitor_rect_,
+                                            frame.get())) {
+      return nullptr;
+    }
+    updated_region->SetRect(DesktopRect::MakeSize(frame->size()));
+  }
+
+  return std::move(frame);
+}
+
+void ScreenCapturerX11::ScreenConfigurationChanged() {
+  TRACE_EVENT0("webrtc", "ScreenCapturerX11::ScreenConfigurationChanged");
+  // Make sure the frame buffers will be reallocated.
+  queue_.Reset();
+
+  helper_.ClearInvalidRegion();
+  if (!x_server_pixel_buffer_.Init(atom_cache_.get(),
+                                   DefaultRootWindow(display()))) {
+    RTC_LOG(LS_ERROR) << "Failed to initialize pixel buffer after screen "
+                         "configuration change.";
+  }
+
+  if (use_randr_) {
+    // Adding/removing RANDR monitors can generate a ConfigureNotify event
+    // without generating any RRScreenChangeNotify event. So it is important to
+    // update the monitors here even if the screen resolution hasn't changed.
+    UpdateMonitors();
+  } else {
+    selected_monitor_rect_ =
+        DesktopRect::MakeSize(x_server_pixel_buffer_.window_size());
+  }
+}
+
+void ScreenCapturerX11::SynchronizeFrame() {
+  // Synchronize the current buffer with the previous one since we do not
+  // capture the entire desktop. Note that encoder may be reading from the
+  // previous buffer at this time so thread access complaints are false
+  // positives.
+
+  // TODO(hclam): We can reduce the amount of copying here by subtracting
+  // `capturer_helper_`s region from `last_invalid_region_`.
+  // http://crbug.com/92354
+  RTC_DCHECK(queue_.previous_frame());
+
+  DesktopFrame* current = queue_.current_frame();
+  DesktopFrame* last = queue_.previous_frame();
+  RTC_DCHECK(current != last);
+  for (DesktopRegion::Iterator it(last_invalid_region_); !it.IsAtEnd();
+       it.Advance()) {
+    const DesktopRect& r = it.rect();
+    current->CopyPixelsFrom(*last, r.top_left(), r);
+  }
+}
+
+RTC_NO_SANITIZE("cfi-icall")
+void ScreenCapturerX11::DeinitXlib() {
+  if (monitors_) {
+    free_monitors_(monitors_);
+    monitors_ = nullptr;
+  }
+
+  if (gc_) {
+    XFreeGC(display(), gc_);
+    gc_ = nullptr;
+  }
+
+  x_server_pixel_buffer_.Release();
+
+  if (display()) {
+    if (damage_handle_) {
+      XDamageDestroy(display(), damage_handle_);
+      damage_handle_ = 0;
+    }
+
+    if (damage_region_) {
+      XFixesDestroyRegion(display(), damage_region_);
+      damage_region_ = 0;
+    }
+  }
+}
+
+// static
+std::unique_ptr<DesktopCapturer> ScreenCapturerX11::CreateRawScreenCapturer(
+    const DesktopCaptureOptions& options) {
+  if (!options.x_display())
+    return nullptr;
+
+  std::unique_ptr<ScreenCapturerX11> capturer(new ScreenCapturerX11());
+  if (!capturer.get()->Init(options)) {
+    return nullptr;
+  }
+
+  return std::move(capturer);
+}
+
+}  // namespace webrtc

TMessagesProj/jni/voip/webrtc/modules/desktop_capture/linux/x11/screen_capturer_x11.h

@@ -0,0 +1,147 @@
+/*
+ *  Copyright 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef MODULES_DESKTOP_CAPTURE_LINUX_X11_SCREEN_CAPTURER_X11_H_
+#define MODULES_DESKTOP_CAPTURE_LINUX_X11_SCREEN_CAPTURER_X11_H_
+
+#include <X11/X.h>
+#include <X11/Xlib.h>
+#include <X11/extensions/Xdamage.h>
+#include <X11/extensions/Xfixes.h>
+#include <X11/extensions/Xrandr.h>
+
+#include <memory>
+
+#include "modules/desktop_capture/desktop_capture_options.h"
+#include "modules/desktop_capture/desktop_capturer.h"
+#include "modules/desktop_capture/desktop_frame.h"
+#include "modules/desktop_capture/desktop_region.h"
+#include "modules/desktop_capture/linux/x11/shared_x_display.h"
+#include "modules/desktop_capture/linux/x11/x_atom_cache.h"
+#include "modules/desktop_capture/linux/x11/x_server_pixel_buffer.h"
+#include "modules/desktop_capture/screen_capture_frame_queue.h"
+#include "modules/desktop_capture/screen_capturer_helper.h"
+#include "modules/desktop_capture/shared_desktop_frame.h"
+
+namespace webrtc {
+
+// A class to perform video frame capturing for Linux on X11.
+//
+// If XDamage is used, this class sets DesktopFrame::updated_region() according
+// to the areas reported by XDamage. Otherwise this class does not detect
+// DesktopFrame::updated_region(), the field is always set to the entire frame
+// rectangle. ScreenCapturerDifferWrapper should be used if that functionality
+// is necessary.
+class ScreenCapturerX11 : public DesktopCapturer,
+                          public SharedXDisplay::XEventHandler {
+ public:
+  ScreenCapturerX11();
+  ~ScreenCapturerX11() override;
+
+  ScreenCapturerX11(const ScreenCapturerX11&) = delete;
+  ScreenCapturerX11& operator=(const ScreenCapturerX11&) = delete;
+
+  static std::unique_ptr<DesktopCapturer> CreateRawScreenCapturer(
+      const DesktopCaptureOptions& options);
+
+  // TODO(ajwong): Do we really want this to be synchronous?
+  bool Init(const DesktopCaptureOptions& options);
+
+  // DesktopCapturer interface.
+  void Start(Callback* delegate) override;
+  void CaptureFrame() override;
+  bool GetSourceList(SourceList* sources) override;
+  bool SelectSource(SourceId id) override;
+
+ private:
+  Display* display() { return options_.x_display()->display(); }
+
+  // SharedXDisplay::XEventHandler interface.
+  bool HandleXEvent(const XEvent& event) override;
+
+  void InitXDamage();
+  void InitXrandr();
+  void UpdateMonitors();
+
+  // Capture screen pixels to the current buffer in the queue. In the DAMAGE
+  // case, the ScreenCapturerHelper already holds the list of invalid rectangles
+  // from HandleXEvent(). In the non-DAMAGE case, this captures the
+  // whole screen, then calculates some invalid rectangles that include any
+  // differences between this and the previous capture.
+  std::unique_ptr<DesktopFrame> CaptureScreen();
+
+  // Called when the screen configuration is changed.
+  void ScreenConfigurationChanged();
+
+  // Synchronize the current buffer with `last_buffer_`, by copying pixels from
+  // the area of `last_invalid_rects`.
+  // Note this only works on the assumption that kNumBuffers == 2, as
+  // `last_invalid_rects` holds the differences from the previous buffer and
+  // the one prior to that (which will then be the current buffer).
+  void SynchronizeFrame();
+
+  void DeinitXlib();
+
+  DesktopCaptureOptions options_;
+
+  Callback* callback_ = nullptr;
+
+  // X11 graphics context.
+  GC gc_ = nullptr;
+  Window root_window_ = BadValue;
+
+  // XRandR 1.5 monitors.
+  bool use_randr_ = false;
+  int randr_event_base_ = 0;
+  XRRMonitorInfo* monitors_ = nullptr;
+  int num_monitors_ = 0;
+  DesktopRect selected_monitor_rect_;
+  // selected_monitor_name_ will be changed to kFullDesktopScreenId
+  // by a call to SelectSource() at the end of Init() because
+  // selected_monitor_rect_ should be updated as well.
+  // Setting it to kFullDesktopScreenId here might be misleading.
+  Atom selected_monitor_name_ = 0;
+  typedef XRRMonitorInfo* (*get_monitors_func)(Display*, Window, Bool, int*);
+  typedef void (*free_monitors_func)(XRRMonitorInfo*);
+  get_monitors_func get_monitors_ = nullptr;
+  free_monitors_func free_monitors_ = nullptr;
+
+  // XFixes.
+  bool has_xfixes_ = false;
+  int xfixes_event_base_ = -1;
+  int xfixes_error_base_ = -1;
+
+  // XDamage information.
+  bool use_damage_ = false;
+  Damage damage_handle_ = 0;
+  int damage_event_base_ = -1;
+  int damage_error_base_ = -1;
+  XserverRegion damage_region_ = 0;
+
+  // Access to the X Server's pixel buffer.
+  XServerPixelBuffer x_server_pixel_buffer_;
+
+  // A thread-safe list of invalid rectangles, and the size of the most
+  // recently captured screen.
+  ScreenCapturerHelper helper_;
+
+  // Queue of the frames buffers.
+  ScreenCaptureFrameQueue<SharedDesktopFrame> queue_;
+
+  // Invalid region from the previous capture. This is used to synchronize the
+  // current with the last buffer used.
+  DesktopRegion last_invalid_region_;
+
+  std::unique_ptr<XAtomCache> atom_cache_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_LINUX_X11_SCREEN_CAPTURER_X11_H_

TMessagesProj/jni/voip/webrtc/modules/desktop_capture/linux/x11/shared_x_display.cc

@@ -0,0 +1,108 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "modules/desktop_capture/linux/x11/shared_x_display.h"
+
+#include <X11/Xlib.h>
+#include <X11/extensions/XTest.h>
+
+#include <algorithm>
+
+#include "absl/strings/string_view.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/logging.h"
+
+namespace webrtc {
+
+SharedXDisplay::SharedXDisplay(Display* display) : display_(display) {
+  RTC_DCHECK(display_);
+}
+
+SharedXDisplay::~SharedXDisplay() {
+  RTC_DCHECK(event_handlers_.empty());
+  XCloseDisplay(display_);
+}
+
+// static
+rtc::scoped_refptr<SharedXDisplay> SharedXDisplay::Create(
+    absl::string_view display_name) {
+  Display* display = XOpenDisplay(
+      display_name.empty() ? NULL : std::string(display_name).c_str());
+  if (!display) {
+    RTC_LOG(LS_ERROR) << "Unable to open display";
+    return nullptr;
+  }
+  return rtc::scoped_refptr<SharedXDisplay>(new SharedXDisplay(display));
+}
+
+// static
+rtc::scoped_refptr<SharedXDisplay> SharedXDisplay::CreateDefault() {
+  return Create(std::string());
+}
+
+void SharedXDisplay::AddEventHandler(int type, XEventHandler* handler) {
+  MutexLock lock(&mutex_);
+  event_handlers_[type].push_back(handler);
+}
+
+void SharedXDisplay::RemoveEventHandler(int type, XEventHandler* handler) {
+  MutexLock lock(&mutex_);
+  EventHandlersMap::iterator handlers = event_handlers_.find(type);
+  if (handlers == event_handlers_.end())
+    return;
+
+  std::vector<XEventHandler*>::iterator new_end =
+      std::remove(handlers->second.begin(), handlers->second.end(), handler);
+  handlers->second.erase(new_end, handlers->second.end());
+
+  // Check if no handlers left for this event.
+  if (handlers->second.empty())
+    event_handlers_.erase(handlers);
+}
+
+void SharedXDisplay::ProcessPendingXEvents() {
+  // Hold reference to `this` to prevent it from being destroyed while
+  // processing events.
+  rtc::scoped_refptr<SharedXDisplay> self(this);
+
+  // Protect access to `event_handlers_` after incrementing the refcount for
+  // `this` to ensure the instance is still valid when the lock is acquired.
+  MutexLock lock(&mutex_);
+
+  // Find the number of events that are outstanding "now."  We don't just loop
+  // on XPending because we want to guarantee this terminates.
+  int events_to_process = XPending(display());
+  XEvent e;
+
+  for (int i = 0; i < events_to_process; i++) {
+    XNextEvent(display(), &e);
+    EventHandlersMap::iterator handlers = event_handlers_.find(e.type);
+    if (handlers == event_handlers_.end())
+      continue;
+    for (std::vector<XEventHandler*>::iterator it = handlers->second.begin();
+         it != handlers->second.end(); ++it) {
+      if ((*it)->HandleXEvent(e))
+        break;
+    }
+  }
+}
+
+void SharedXDisplay::IgnoreXServerGrabs() {
+  int test_event_base = 0;
+  int test_error_base = 0;
+  int major = 0;
+  int minor = 0;
+  if (XTestQueryExtension(display(), &test_event_base, &test_error_base, &major,
+                          &minor)) {
+    XTestGrabControl(display(), true);
+  }
+}
+
+}  // namespace webrtc

TMessagesProj/jni/voip/webrtc/modules/desktop_capture/linux/x11/shared_x_display.h

@@ -0,0 +1,88 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef MODULES_DESKTOP_CAPTURE_LINUX_X11_SHARED_X_DISPLAY_H_
+#define MODULES_DESKTOP_CAPTURE_LINUX_X11_SHARED_X_DISPLAY_H_
+
+#include <map>
+#include <vector>
+
+#include "absl/strings/string_view.h"
+#include "api/ref_counted_base.h"
+#include "api/scoped_refptr.h"
+#include "rtc_base/synchronization/mutex.h"
+#include "rtc_base/system/rtc_export.h"
+#include "rtc_base/thread_annotations.h"
+
+// Including Xlib.h will involve evil defines (Bool, Status, True, False), which
+// easily conflict with other headers.
+typedef struct _XDisplay Display;
+typedef union _XEvent XEvent;
+
+namespace webrtc {
+
+// A ref-counted object to store XDisplay connection.
+class RTC_EXPORT SharedXDisplay
+    : public rtc::RefCountedNonVirtual<SharedXDisplay> {
+ public:
+  class XEventHandler {
+   public:
+    virtual ~XEventHandler() {}
+
+    // Processes XEvent. Returns true if the event has been handled.
+    virtual bool HandleXEvent(const XEvent& event) = 0;
+  };
+
+  // Creates a new X11 Display for the `display_name`. NULL is returned if X11
+  // connection failed. Equivalent to CreateDefault() when `display_name` is
+  // empty.
+  static rtc::scoped_refptr<SharedXDisplay> Create(
+      absl::string_view display_name);
+
+  // Creates X11 Display connection for the default display (e.g. specified in
+  // DISPLAY). NULL is returned if X11 connection failed.
+  static rtc::scoped_refptr<SharedXDisplay> CreateDefault();
+
+  Display* display() { return display_; }
+
+  // Adds a new event `handler` for XEvent's of `type`.
+  void AddEventHandler(int type, XEventHandler* handler);
+
+  // Removes event `handler` added using `AddEventHandler`. Doesn't do anything
+  // if `handler` is not registered.
+  void RemoveEventHandler(int type, XEventHandler* handler);
+
+  // Processes pending XEvents, calling corresponding event handlers.
+  void ProcessPendingXEvents();
+
+  void IgnoreXServerGrabs();
+
+  ~SharedXDisplay();
+
+  SharedXDisplay(const SharedXDisplay&) = delete;
+  SharedXDisplay& operator=(const SharedXDisplay&) = delete;
+
+ protected:
+  // Takes ownership of `display`.
+  explicit SharedXDisplay(Display* display);
+
+ private:
+  typedef std::map<int, std::vector<XEventHandler*> > EventHandlersMap;
+
+  Display* display_;
+
+  Mutex mutex_;
+
+  EventHandlersMap event_handlers_ RTC_GUARDED_BY(mutex_);
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_LINUX_X11_SHARED_X_DISPLAY_H_

TMessagesProj/jni/voip/webrtc/modules/desktop_capture/linux/x11/window_capturer_x11.cc

@@ -0,0 +1,248 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "modules/desktop_capture/linux/x11/window_capturer_x11.h"
+
+#include <X11/Xutil.h>
+#include <X11/extensions/Xcomposite.h>
+#include <X11/extensions/composite.h>
+#include <string.h>
+
+#include <memory>
+#include <string>
+#include <utility>
+
+#include "api/scoped_refptr.h"
+#include "modules/desktop_capture/desktop_capture_types.h"
+#include "modules/desktop_capture/desktop_frame.h"
+#include "modules/desktop_capture/desktop_region.h"
+#include "modules/desktop_capture/linux/x11/shared_x_display.h"
+#include "modules/desktop_capture/linux/x11/window_finder_x11.h"
+#include "modules/desktop_capture/linux/x11/window_list_utils.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/logging.h"
+#include "rtc_base/trace_event.h"
+
+namespace webrtc {
+
+WindowCapturerX11::WindowCapturerX11(const DesktopCaptureOptions& options)
+    : x_display_(options.x_display()),
+      atom_cache_(display()),
+      window_finder_(&atom_cache_) {
+  int event_base, error_base, major_version, minor_version;
+  if (XCompositeQueryExtension(display(), &event_base, &error_base) &&
+      XCompositeQueryVersion(display(), &major_version, &minor_version) &&
+      // XCompositeNameWindowPixmap() requires version 0.2
+      (major_version > 0 || minor_version >= 2)) {
+    has_composite_extension_ = true;
+  } else {
+    RTC_LOG(LS_INFO) << "Xcomposite extension not available or too old.";
+  }
+
+  x_display_->AddEventHandler(ConfigureNotify, this);
+}
+
+WindowCapturerX11::~WindowCapturerX11() {
+  x_display_->RemoveEventHandler(ConfigureNotify, this);
+}
+
+bool WindowCapturerX11::GetSourceList(SourceList* sources) {
+  return GetWindowList(&atom_cache_, [this, sources](::Window window) {
+    Source w;
+    w.id = window;
+    if (this->GetWindowTitle(window, &w.title)) {
+      sources->push_back(w);
+    }
+    return true;
+  });
+}
+
+bool WindowCapturerX11::SelectSource(SourceId id) {
+  if (!x_server_pixel_buffer_.Init(&atom_cache_, id))
+    return false;
+
+  // Tell the X server to send us window resizing events.
+  XSelectInput(display(), id, StructureNotifyMask);
+
+  selected_window_ = id;
+
+  // In addition to needing X11 server-side support for Xcomposite, it actually
+  // needs to be turned on for the window. If the user has modern
+  // hardware/drivers but isn't using a compositing window manager, that won't
+  // be the case. Here we automatically turn it on.
+
+  // Redirect drawing to an offscreen buffer (ie, turn on compositing). X11
+  // remembers who has requested this and will turn it off for us when we exit.
+  XCompositeRedirectWindow(display(), id, CompositeRedirectAutomatic);
+
+  return true;
+}
+
+bool WindowCapturerX11::FocusOnSelectedSource() {
+  if (!selected_window_)
+    return false;
+
+  unsigned int num_children;
+  ::Window* children;
+  ::Window parent;
+  ::Window root;
+  // Find the root window to pass event to.
+  int status = XQueryTree(display(), selected_window_, &root, &parent,
+                          &children, &num_children);
+  if (status == 0) {
+    RTC_LOG(LS_ERROR) << "Failed to query for the root window.";
+    return false;
+  }
+
+  if (children)
+    XFree(children);
+
+  XRaiseWindow(display(), selected_window_);
+
+  // Some window managers (e.g., metacity in GNOME) consider it illegal to
+  // raise a window without also giving it input focus with
+  // _NET_ACTIVE_WINDOW, so XRaiseWindow() on its own isn't enough.
+  Atom atom = XInternAtom(display(), "_NET_ACTIVE_WINDOW", True);
+  if (atom != None) {
+    XEvent xev;
+    xev.xclient.type = ClientMessage;
+    xev.xclient.serial = 0;
+    xev.xclient.send_event = True;
+    xev.xclient.window = selected_window_;
+    xev.xclient.message_type = atom;
+
+    // The format member is set to 8, 16, or 32 and specifies whether the
+    // data should be viewed as a list of bytes, shorts, or longs.
+    xev.xclient.format = 32;
+
+    memset(xev.xclient.data.l, 0, sizeof(xev.xclient.data.l));
+
+    XSendEvent(display(), root, False,
+               SubstructureRedirectMask | SubstructureNotifyMask, &xev);
+  }
+  XFlush(display());
+  return true;
+}
+
+void WindowCapturerX11::Start(Callback* callback) {
+  RTC_DCHECK(!callback_);
+  RTC_DCHECK(callback);
+
+  callback_ = callback;
+}
+
+void WindowCapturerX11::CaptureFrame() {
+  TRACE_EVENT0("webrtc", "WindowCapturerX11::CaptureFrame");
+
+  if (!x_server_pixel_buffer_.IsWindowValid()) {
+    RTC_LOG(LS_ERROR) << "The window is no longer valid.";
+    callback_->OnCaptureResult(Result::ERROR_PERMANENT, nullptr);
+    return;
+  }
+
+  x_display_->ProcessPendingXEvents();
+
+  if (!has_composite_extension_) {
+    // Without the Xcomposite extension we capture when the whole window is
+    // visible on screen and not covered by any other window. This is not
+    // something we want so instead, just bail out.
+    RTC_LOG(LS_ERROR) << "No Xcomposite extension detected.";
+    callback_->OnCaptureResult(Result::ERROR_PERMANENT, nullptr);
+    return;
+  }
+
+  if (GetWindowState(&atom_cache_, selected_window_) == IconicState) {
+    // Window is in minimized. Return a 1x1 frame as same as OSX/Win does.
+    std::unique_ptr<DesktopFrame> frame(
+        new BasicDesktopFrame(DesktopSize(1, 1)));
+    callback_->OnCaptureResult(Result::SUCCESS, std::move(frame));
+    return;
+  }
+
+  std::unique_ptr<DesktopFrame> frame(
+      new BasicDesktopFrame(x_server_pixel_buffer_.window_size()));
+
+  x_server_pixel_buffer_.Synchronize();
+  if (!x_server_pixel_buffer_.CaptureRect(DesktopRect::MakeSize(frame->size()),
+                                          frame.get())) {
+    RTC_LOG(LS_WARNING) << "Temporarily failed to capture winodw.";
+    callback_->OnCaptureResult(Result::ERROR_TEMPORARY, nullptr);
+    return;
+  }
+
+  frame->mutable_updated_region()->SetRect(
+      DesktopRect::MakeSize(frame->size()));
+  frame->set_top_left(x_server_pixel_buffer_.window_rect().top_left());
+  frame->set_capturer_id(DesktopCapturerId::kX11CapturerLinux);
+
+  callback_->OnCaptureResult(Result::SUCCESS, std::move(frame));
+}
+
+bool WindowCapturerX11::IsOccluded(const DesktopVector& pos) {
+  return window_finder_.GetWindowUnderPoint(pos) !=
+         static_cast<WindowId>(selected_window_);
+}
+
+bool WindowCapturerX11::HandleXEvent(const XEvent& event) {
+  if (event.type == ConfigureNotify) {
+    XConfigureEvent xce = event.xconfigure;
+    if (xce.window == selected_window_) {
+      if (!DesktopRectFromXAttributes(xce).equals(
+              x_server_pixel_buffer_.window_rect())) {
+        if (!x_server_pixel_buffer_.Init(&atom_cache_, selected_window_)) {
+          RTC_LOG(LS_ERROR)
+              << "Failed to initialize pixel buffer after resizing.";
+        }
+      }
+    }
+  }
+
+  // Always returns false, so other observers can still receive the events.
+  return false;
+}
+
+bool WindowCapturerX11::GetWindowTitle(::Window window, std::string* title) {
+  int status;
+  bool result = false;
+  XTextProperty window_name;
+  window_name.value = nullptr;
+  if (window) {
+    status = XGetWMName(display(), window, &window_name);
+    if (status && window_name.value && window_name.nitems) {
+      int cnt;
+      char** list = nullptr;
+      status =
+          Xutf8TextPropertyToTextList(display(), &window_name, &list, &cnt);
+      if (status >= Success && cnt && *list) {
+        if (cnt > 1) {
+          RTC_LOG(LS_INFO) << "Window has " << cnt
+                           << " text properties, only using the first one.";
+        }
+        *title = *list;
+        result = true;
+      }
+      if (list)
+        XFreeStringList(list);
+    }
+    if (window_name.value)
+      XFree(window_name.value);
+  }
+  return result;
+}
+
+// static
+std::unique_ptr<DesktopCapturer> WindowCapturerX11::CreateRawWindowCapturer(
+    const DesktopCaptureOptions& options) {
+  if (!options.x_display())
+    return nullptr;
+  return std::unique_ptr<DesktopCapturer>(new WindowCapturerX11(options));
+}
+
+}  // namespace webrtc

TMessagesProj/jni/voip/webrtc/modules/desktop_capture/linux/x11/window_capturer_x11.h

@@ -0,0 +1,74 @@
+/*
+ *  Copyright 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef MODULES_DESKTOP_CAPTURE_LINUX_X11_WINDOW_CAPTURER_X11_H_
+#define MODULES_DESKTOP_CAPTURE_LINUX_X11_WINDOW_CAPTURER_X11_H_
+
+#include <X11/X.h>
+#include <X11/Xlib.h>
+
+#include <memory>
+#include <string>
+
+#include "api/scoped_refptr.h"
+#include "modules/desktop_capture/desktop_capture_options.h"
+#include "modules/desktop_capture/desktop_capturer.h"
+#include "modules/desktop_capture/desktop_geometry.h"
+#include "modules/desktop_capture/linux/x11/shared_x_display.h"
+#include "modules/desktop_capture/linux/x11/window_finder_x11.h"
+#include "modules/desktop_capture/linux/x11/x_atom_cache.h"
+#include "modules/desktop_capture/linux/x11/x_server_pixel_buffer.h"
+
+namespace webrtc {
+
+class WindowCapturerX11 : public DesktopCapturer,
+                          public SharedXDisplay::XEventHandler {
+ public:
+  explicit WindowCapturerX11(const DesktopCaptureOptions& options);
+  ~WindowCapturerX11() override;
+
+  WindowCapturerX11(const WindowCapturerX11&) = delete;
+  WindowCapturerX11& operator=(const WindowCapturerX11&) = delete;
+
+  static std::unique_ptr<DesktopCapturer> CreateRawWindowCapturer(
+      const DesktopCaptureOptions& options);
+
+  // DesktopCapturer interface.
+  void Start(Callback* callback) override;
+  void CaptureFrame() override;
+  bool GetSourceList(SourceList* sources) override;
+  bool SelectSource(SourceId id) override;
+  bool FocusOnSelectedSource() override;
+  bool IsOccluded(const DesktopVector& pos) override;
+
+  // SharedXDisplay::XEventHandler interface.
+  bool HandleXEvent(const XEvent& event) override;
+
+ private:
+  Display* display() { return x_display_->display(); }
+
+  // Returns window title for the specified X `window`.
+  bool GetWindowTitle(::Window window, std::string* title);
+
+  Callback* callback_ = nullptr;
+
+  rtc::scoped_refptr<SharedXDisplay> x_display_;
+
+  bool has_composite_extension_ = false;
+
+  ::Window selected_window_ = 0;
+  XServerPixelBuffer x_server_pixel_buffer_;
+  XAtomCache atom_cache_;
+  WindowFinderX11 window_finder_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_LINUX_X11_WINDOW_CAPTURER_X11_H_

TMessagesProj/jni/voip/webrtc/modules/desktop_capture/linux/x11/window_finder_x11.cc

@@ -0,0 +1,52 @@
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "modules/desktop_capture/linux/x11/window_finder_x11.h"
+
+#include <X11/X.h>
+
+#include <memory>
+
+#include "modules/desktop_capture/linux/x11/window_list_utils.h"
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+
+WindowFinderX11::WindowFinderX11(XAtomCache* cache) : cache_(cache) {
+  RTC_DCHECK(cache_);
+}
+
+WindowFinderX11::~WindowFinderX11() = default;
+
+WindowId WindowFinderX11::GetWindowUnderPoint(DesktopVector point) {
+  WindowId id = kNullWindowId;
+  GetWindowList(cache_, [&id, this, point](::Window window) {
+    DesktopRect rect;
+    if (GetWindowRect(this->cache_->display(), window, &rect) &&
+        rect.Contains(point)) {
+      id = window;
+      return false;
+    }
+    return true;
+  });
+  return id;
+}
+
+// static
+std::unique_ptr<WindowFinder> WindowFinder::Create(
+    const WindowFinder::Options& options) {
+  if (options.cache == nullptr) {
+    return nullptr;
+  }
+
+  return std::make_unique<WindowFinderX11>(options.cache);
+}
+
+}  // namespace webrtc

TMessagesProj/jni/voip/webrtc/modules/desktop_capture/linux/x11/window_finder_x11.h

@@ -0,0 +1,35 @@
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef MODULES_DESKTOP_CAPTURE_LINUX_X11_WINDOW_FINDER_X11_H_
+#define MODULES_DESKTOP_CAPTURE_LINUX_X11_WINDOW_FINDER_X11_H_
+
+#include "modules/desktop_capture/window_finder.h"
+
+namespace webrtc {
+
+class XAtomCache;
+
+// The implementation of WindowFinder for X11.
+class WindowFinderX11 final : public WindowFinder {
+ public:
+  explicit WindowFinderX11(XAtomCache* cache);
+  ~WindowFinderX11() override;
+
+  // WindowFinder implementation.
+  WindowId GetWindowUnderPoint(DesktopVector point) override;
+
+ private:
+  XAtomCache* const cache_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_LINUX_X11_WINDOW_FINDER_X11_H_

TMessagesProj/jni/voip/webrtc/modules/desktop_capture/linux/x11/window_list_utils.cc

@@ -0,0 +1,198 @@
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "modules/desktop_capture/linux/x11/window_list_utils.h"
+
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <string.h>
+
+#include <algorithm>
+
+#include "modules/desktop_capture/linux/x11/x_error_trap.h"
+#include "modules/desktop_capture/linux/x11/x_window_property.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/logging.h"
+
+namespace webrtc {
+
+namespace {
+
+class DeferXFree {
+ public:
+  explicit DeferXFree(void* data) : data_(data) {}
+  ~DeferXFree();
+
+ private:
+  void* const data_;
+};
+
+DeferXFree::~DeferXFree() {
+  if (data_)
+    XFree(data_);
+}
+
+// Iterates through `window` hierarchy to find first visible window, i.e. one
+// that has WM_STATE property set to NormalState.
+// See http://tronche.com/gui/x/icccm/sec-4.html#s-4.1.3.1 .
+::Window GetApplicationWindow(XAtomCache* cache, ::Window window) {
+  int32_t state = GetWindowState(cache, window);
+  if (state == NormalState) {
+    // Window has WM_STATE==NormalState. Return it.
+    return window;
+  } else if (state == IconicState) {
+    // Window is in minimized. Skip it.
+    return 0;
+  }
+
+  RTC_DCHECK_EQ(state, WithdrawnState);
+  // If the window is in WithdrawnState then look at all of its children.
+  ::Window root, parent;
+  ::Window* children;
+  unsigned int num_children;
+  if (!XQueryTree(cache->display(), window, &root, &parent, &children,
+                  &num_children)) {
+    RTC_LOG(LS_ERROR) << "Failed to query for child windows although window"
+                         "does not have a valid WM_STATE.";
+    return 0;
+  }
+  ::Window app_window = 0;
+  for (unsigned int i = 0; i < num_children; ++i) {
+    app_window = GetApplicationWindow(cache, children[i]);
+    if (app_window)
+      break;
+  }
+
+  if (children)
+    XFree(children);
+  return app_window;
+}
+
+// Returns true if the `window` is a desktop element.
+bool IsDesktopElement(XAtomCache* cache, ::Window window) {
+  RTC_DCHECK(cache);
+  if (window == 0)
+    return false;
+
+  // First look for _NET_WM_WINDOW_TYPE. The standard
+  // (http://standards.freedesktop.org/wm-spec/latest/ar01s05.html#id2760306)
+  // says this hint *should* be present on all windows, and we use the existence
+  // of _NET_WM_WINDOW_TYPE_NORMAL in the property to indicate a window is not
+  // a desktop element (that is, only "normal" windows should be shareable).
+  XWindowProperty<uint32_t> window_type(cache->display(), window,
+                                        cache->WindowType());
+  if (window_type.is_valid() && window_type.size() > 0) {
+    uint32_t* end = window_type.data() + window_type.size();
+    bool is_normal =
+        (end != std::find(window_type.data(), end, cache->WindowTypeNormal()));
+    return !is_normal;
+  }
+
+  // Fall back on using the hint.
+  XClassHint class_hint;
+  Status status = XGetClassHint(cache->display(), window, &class_hint);
+  if (status == 0) {
+    // No hints, assume this is a normal application window.
+    return false;
+  }
+
+  DeferXFree free_res_name(class_hint.res_name);
+  DeferXFree free_res_class(class_hint.res_class);
+  return strcmp("gnome-panel", class_hint.res_name) == 0 ||
+         strcmp("desktop_window", class_hint.res_name) == 0;
+}
+
+}  // namespace
+
+int32_t GetWindowState(XAtomCache* cache, ::Window window) {
+  // Get WM_STATE property of the window.
+  XWindowProperty<uint32_t> window_state(cache->display(), window,
+                                         cache->WmState());
+
+  // WM_STATE is considered to be set to WithdrawnState when it missing.
+  return window_state.is_valid() ? *window_state.data() : WithdrawnState;
+}
+
+bool GetWindowList(XAtomCache* cache,
+                   rtc::FunctionView<bool(::Window)> on_window) {
+  RTC_DCHECK(cache);
+  RTC_DCHECK(on_window);
+  ::Display* const display = cache->display();
+
+  int failed_screens = 0;
+  const int num_screens = XScreenCount(display);
+  for (int screen = 0; screen < num_screens; screen++) {
+    ::Window root_window = XRootWindow(display, screen);
+    ::Window parent;
+    ::Window* children;
+    unsigned int num_children;
+    {
+      XErrorTrap error_trap(display);
+      if (XQueryTree(display, root_window, &root_window, &parent, &children,
+                     &num_children) == 0 ||
+          error_trap.GetLastErrorAndDisable() != 0) {
+        failed_screens++;
+        RTC_LOG(LS_ERROR) << "Failed to query for child windows for screen "
+                          << screen;
+        continue;
+      }
+    }
+
+    DeferXFree free_children(children);
+
+    for (unsigned int i = 0; i < num_children; i++) {
+      // Iterates in reverse order to return windows from front to back.
+      ::Window app_window =
+          GetApplicationWindow(cache, children[num_children - 1 - i]);
+      if (app_window && !IsDesktopElement(cache, app_window)) {
+        if (!on_window(app_window)) {
+          return true;
+        }
+      }
+    }
+  }
+
+  return failed_screens < num_screens;
+}
+
+bool GetWindowRect(::Display* display,
+                   ::Window window,
+                   DesktopRect* rect,
+                   XWindowAttributes* attributes /* = nullptr */) {
+  XWindowAttributes local_attributes;
+  int offset_x;
+  int offset_y;
+  if (attributes == nullptr) {
+    attributes = &local_attributes;
+  }
+
+  {
+    XErrorTrap error_trap(display);
+    if (!XGetWindowAttributes(display, window, attributes) ||
+        error_trap.GetLastErrorAndDisable() != 0) {
+      return false;
+    }
+  }
+  *rect = DesktopRectFromXAttributes(*attributes);
+
+  {
+    XErrorTrap error_trap(display);
+    ::Window child;
+    if (!XTranslateCoordinates(display, window, attributes->root, -rect->left(),
+                               -rect->top(), &offset_x, &offset_y, &child) ||
+        error_trap.GetLastErrorAndDisable() != 0) {
+      return false;
+    }
+  }
+  rect->Translate(offset_x, offset_y);
+  return true;
+}
+
+}  // namespace webrtc

TMessagesProj/jni/voip/webrtc/modules/desktop_capture/linux/x11/window_list_utils.h

@@ -0,0 +1,56 @@
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef MODULES_DESKTOP_CAPTURE_LINUX_X11_WINDOW_LIST_UTILS_H_
+#define MODULES_DESKTOP_CAPTURE_LINUX_X11_WINDOW_LIST_UTILS_H_
+
+#include <X11/X.h>
+#include <X11/Xlib.h>
+#include <stdint.h>
+
+#include "api/function_view.h"
+#include "modules/desktop_capture/desktop_geometry.h"
+#include "modules/desktop_capture/linux/x11/x_atom_cache.h"
+
+namespace webrtc {
+
+// Synchronously iterates all on-screen windows in `cache`.display() in
+// decreasing z-order and sends them one-by-one to `on_window` function before
+// GetWindowList() returns. If `on_window` returns false, this function ignores
+// other windows and returns immediately. GetWindowList() returns false if
+// native APIs failed. If multiple screens are attached to the `display`, this
+// function returns false only when native APIs failed on all screens. Menus,
+// panels and minimized windows will be ignored.
+bool GetWindowList(XAtomCache* cache,
+                   rtc::FunctionView<bool(::Window)> on_window);
+
+// Returns WM_STATE property of the `window`. This function returns
+// WithdrawnState if the `window` is missing.
+int32_t GetWindowState(XAtomCache* cache, ::Window window);
+
+// Returns the rectangle of the `window` in the coordinates of `display`. This
+// function returns false if native APIs failed. If `attributes` is provided, it
+// will be filled with the attributes of `window`. The `rect` is in system
+// coordinate, i.e. the primary monitor always starts from (0, 0).
+bool GetWindowRect(::Display* display,
+                   ::Window window,
+                   DesktopRect* rect,
+                   XWindowAttributes* attributes = nullptr);
+
+// Creates a DesktopRect from `attributes`.
+template <typename T>
+DesktopRect DesktopRectFromXAttributes(const T& attributes) {
+  return DesktopRect::MakeXYWH(attributes.x, attributes.y, attributes.width,
+                               attributes.height);
+}
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_LINUX_X11_WINDOW_LIST_UTILS_H_

TMessagesProj/jni/voip/webrtc/modules/desktop_capture/linux/x11/x_atom_cache.cc

@@ -0,0 +1,51 @@
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "modules/desktop_capture/linux/x11/x_atom_cache.h"
+
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+
+XAtomCache::XAtomCache(::Display* display) : display_(display) {
+  RTC_DCHECK(display_);
+}
+
+XAtomCache::~XAtomCache() = default;
+
+::Display* XAtomCache::display() const {
+  return display_;
+}
+
+Atom XAtomCache::WmState() {
+  return CreateIfNotExist(&wm_state_, "WM_STATE");
+}
+
+Atom XAtomCache::WindowType() {
+  return CreateIfNotExist(&window_type_, "_NET_WM_WINDOW_TYPE");
+}
+
+Atom XAtomCache::WindowTypeNormal() {
+  return CreateIfNotExist(&window_type_normal_, "_NET_WM_WINDOW_TYPE_NORMAL");
+}
+
+Atom XAtomCache::IccProfile() {
+  return CreateIfNotExist(&icc_profile_, "_ICC_PROFILE");
+}
+
+Atom XAtomCache::CreateIfNotExist(Atom* atom, const char* name) {
+  RTC_DCHECK(atom);
+  if (*atom == None) {
+    *atom = XInternAtom(display(), name, True);
+  }
+  return *atom;
+}
+
+}  // namespace webrtc

TMessagesProj/jni/voip/webrtc/modules/desktop_capture/linux/x11/x_atom_cache.h

@@ -0,0 +1,45 @@
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef MODULES_DESKTOP_CAPTURE_LINUX_X11_X_ATOM_CACHE_H_
+#define MODULES_DESKTOP_CAPTURE_LINUX_X11_X_ATOM_CACHE_H_
+
+#include <X11/X.h>
+#include <X11/Xlib.h>
+
+namespace webrtc {
+
+// A cache of Atom. Each Atom object is created on demand.
+class XAtomCache final {
+ public:
+  explicit XAtomCache(::Display* display);
+  ~XAtomCache();
+
+  ::Display* display() const;
+
+  Atom WmState();
+  Atom WindowType();
+  Atom WindowTypeNormal();
+  Atom IccProfile();
+
+ private:
+  // If |*atom| is None, this function uses XInternAtom() to retrieve an Atom.
+  Atom CreateIfNotExist(Atom* atom, const char* name);
+
+  ::Display* const display_;
+  Atom wm_state_ = None;
+  Atom window_type_ = None;
+  Atom window_type_normal_ = None;
+  Atom icc_profile_ = None;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_LINUX_X11_X_ATOM_CACHE_H_

TMessagesProj/jni/voip/webrtc/modules/desktop_capture/linux/x11/x_error_trap.cc

@@ -0,0 +1,60 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "modules/desktop_capture/linux/x11/x_error_trap.h"
+
+#include <stddef.h>
+
+#include <atomic>
+
+#include "rtc_base/checks.h"
+
+namespace webrtc {
+
+namespace {
+
+static int g_last_xserver_error_code = 0;
+static std::atomic<Display*> g_display_for_error_handler = nullptr;
+
+Mutex* AcquireMutex() {
+  static Mutex* mutex = new Mutex();
+  return mutex;
+}
+
+int XServerErrorHandler(Display* display, XErrorEvent* error_event) {
+  RTC_DCHECK_EQ(display, g_display_for_error_handler.load());
+  g_last_xserver_error_code = error_event->error_code;
+  return 0;
+}
+
+}  // namespace
+
+XErrorTrap::XErrorTrap(Display* display) : mutex_lock_(AcquireMutex()) {
+  // We don't expect this class to be used in a nested fashion so therefore
+  // g_display_for_error_handler should never be valid here.
+  RTC_DCHECK(!g_display_for_error_handler.load());
+  RTC_DCHECK(display);
+  g_display_for_error_handler.store(display);
+  g_last_xserver_error_code = 0;
+  original_error_handler_ = XSetErrorHandler(&XServerErrorHandler);
+}
+
+int XErrorTrap::GetLastErrorAndDisable() {
+  g_display_for_error_handler.store(nullptr);
+  XSetErrorHandler(original_error_handler_);
+  return g_last_xserver_error_code;
+}
+
+XErrorTrap::~XErrorTrap() {
+  if (g_display_for_error_handler.load() != nullptr)
+    GetLastErrorAndDisable();
+}
+
+}  // namespace webrtc

TMessagesProj/jni/voip/webrtc/modules/desktop_capture/linux/x11/x_error_trap.h

@@ -0,0 +1,42 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef MODULES_DESKTOP_CAPTURE_LINUX_X11_X_ERROR_TRAP_H_
+#define MODULES_DESKTOP_CAPTURE_LINUX_X11_X_ERROR_TRAP_H_
+
+#include <X11/Xlib.h>
+
+#include "rtc_base/synchronization/mutex.h"
+
+namespace webrtc {
+
+// Helper class that registers an X Window error handler. Caller can use
+// GetLastErrorAndDisable() to get the last error that was caught, if any.
+class XErrorTrap {
+ public:
+  explicit XErrorTrap(Display* display);
+
+  XErrorTrap(const XErrorTrap&) = delete;
+  XErrorTrap& operator=(const XErrorTrap&) = delete;
+
+  ~XErrorTrap();
+
+  // Returns the last error if one was caught, otherwise 0. Also unregisters the
+  // error handler and replaces it with `original_error_handler_`.
+  int GetLastErrorAndDisable();
+
+ private:
+  MutexLock mutex_lock_;
+  XErrorHandler original_error_handler_ = nullptr;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_LINUX_X11_X_ERROR_TRAP_H_

TMessagesProj/jni/voip/webrtc/modules/desktop_capture/linux/x11/x_server_pixel_buffer.cc

@@ -0,0 +1,370 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "modules/desktop_capture/linux/x11/x_server_pixel_buffer.h"
+
+#include <X11/Xutil.h>
+#include <stdint.h>
+#include <string.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+
+#include "modules/desktop_capture/desktop_frame.h"
+#include "modules/desktop_capture/linux/x11/window_list_utils.h"
+#include "modules/desktop_capture/linux/x11/x_error_trap.h"
+#include "modules/desktop_capture/linux/x11/x_window_property.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/logging.h"
+
+namespace webrtc {
+
+namespace {
+
+// Returns the number of bits `mask` has to be shifted left so its last
+// (most-significant) bit set becomes the most-significant bit of the word.
+// When `mask` is 0 the function returns 31.
+uint32_t MaskToShift(uint32_t mask) {
+  int shift = 0;
+  if ((mask & 0xffff0000u) == 0) {
+    mask <<= 16;
+    shift += 16;
+  }
+  if ((mask & 0xff000000u) == 0) {
+    mask <<= 8;
+    shift += 8;
+  }
+  if ((mask & 0xf0000000u) == 0) {
+    mask <<= 4;
+    shift += 4;
+  }
+  if ((mask & 0xc0000000u) == 0) {
+    mask <<= 2;
+    shift += 2;
+  }
+  if ((mask & 0x80000000u) == 0)
+    shift += 1;
+
+  return shift;
+}
+
+// Returns true if `image` is in RGB format.
+bool IsXImageRGBFormat(XImage* image) {
+  return image->bits_per_pixel == 32 && image->red_mask == 0xff0000 &&
+         image->green_mask == 0xff00 && image->blue_mask == 0xff;
+}
+
+// We expose two forms of blitting to handle variations in the pixel format.
+// In FastBlit(), the operation is effectively a memcpy.
+void FastBlit(XImage* x_image,
+              uint8_t* src_pos,
+              const DesktopRect& rect,
+              DesktopFrame* frame) {
+  RTC_DCHECK_LE(frame->top_left().x(), rect.left());
+  RTC_DCHECK_LE(frame->top_left().y(), rect.top());
+
+  frame->CopyPixelsFrom(
+      src_pos, x_image->bytes_per_line,
+      DesktopRect::MakeXYWH(rect.left() - frame->top_left().x(),
+                            rect.top() - frame->top_left().y(), rect.width(),
+                            rect.height()));
+}
+
+void SlowBlit(XImage* x_image,
+              uint8_t* src_pos,
+              const DesktopRect& rect,
+              DesktopFrame* frame) {
+  RTC_DCHECK_LE(frame->top_left().x(), rect.left());
+  RTC_DCHECK_LE(frame->top_left().y(), rect.top());
+
+  int src_stride = x_image->bytes_per_line;
+  int dst_x = rect.left() - frame->top_left().x();
+  int dst_y = rect.top() - frame->top_left().y();
+  int width = rect.width(), height = rect.height();
+
+  uint32_t red_mask = x_image->red_mask;
+  uint32_t green_mask = x_image->red_mask;
+  uint32_t blue_mask = x_image->blue_mask;
+
+  uint32_t red_shift = MaskToShift(red_mask);
+  uint32_t green_shift = MaskToShift(green_mask);
+  uint32_t blue_shift = MaskToShift(blue_mask);
+
+  int bits_per_pixel = x_image->bits_per_pixel;
+
+  uint8_t* dst_pos = frame->data() + frame->stride() * dst_y;
+  dst_pos += dst_x * DesktopFrame::kBytesPerPixel;
+  // TODO(hclam): Optimize, perhaps using MMX code or by converting to
+  // YUV directly.
+  // TODO(sergeyu): This code doesn't handle XImage byte order properly and
+  // won't work with 24bpp images. Fix it.
+  for (int y = 0; y < height; y++) {
+    uint32_t* dst_pos_32 = reinterpret_cast<uint32_t*>(dst_pos);
+    uint32_t* src_pos_32 = reinterpret_cast<uint32_t*>(src_pos);
+    uint16_t* src_pos_16 = reinterpret_cast<uint16_t*>(src_pos);
+    for (int x = 0; x < width; x++) {
+      // Dereference through an appropriately-aligned pointer.
+      uint32_t pixel;
+      if (bits_per_pixel == 32) {
+        pixel = src_pos_32[x];
+      } else if (bits_per_pixel == 16) {
+        pixel = src_pos_16[x];
+      } else {
+        pixel = src_pos[x];
+      }
+      uint32_t r = (pixel & red_mask) << red_shift;
+      uint32_t g = (pixel & green_mask) << green_shift;
+      uint32_t b = (pixel & blue_mask) << blue_shift;
+      // Write as 32-bit RGB.
+      dst_pos_32[x] =
+          ((r >> 8) & 0xff0000) | ((g >> 16) & 0xff00) | ((b >> 24) & 0xff);
+    }
+    dst_pos += frame->stride();
+    src_pos += src_stride;
+  }
+}
+
+}  // namespace
+
+XServerPixelBuffer::XServerPixelBuffer() {}
+
+XServerPixelBuffer::~XServerPixelBuffer() {
+  Release();
+}
+
+void XServerPixelBuffer::Release() {
+  if (x_image_) {
+    XDestroyImage(x_image_);
+    x_image_ = nullptr;
+  }
+  if (x_shm_image_) {
+    XDestroyImage(x_shm_image_);
+    x_shm_image_ = nullptr;
+  }
+  if (shm_pixmap_) {
+    XFreePixmap(display_, shm_pixmap_);
+    shm_pixmap_ = 0;
+  }
+  if (shm_gc_) {
+    XFreeGC(display_, shm_gc_);
+    shm_gc_ = nullptr;
+  }
+
+  ReleaseSharedMemorySegment();
+
+  window_ = 0;
+}
+
+void XServerPixelBuffer::ReleaseSharedMemorySegment() {
+  if (!shm_segment_info_)
+    return;
+  if (shm_segment_info_->shmaddr != nullptr)
+    shmdt(shm_segment_info_->shmaddr);
+  if (shm_segment_info_->shmid != -1)
+    shmctl(shm_segment_info_->shmid, IPC_RMID, 0);
+  delete shm_segment_info_;
+  shm_segment_info_ = nullptr;
+}
+
+bool XServerPixelBuffer::Init(XAtomCache* cache, Window window) {
+  Release();
+  display_ = cache->display();
+
+  XWindowAttributes attributes;
+  if (!GetWindowRect(display_, window, &window_rect_, &attributes)) {
+    return false;
+  }
+
+  if (cache->IccProfile() != None) {
+    // `window` is the root window when doing screen capture.
+    XWindowProperty<uint8_t> icc_profile_property(cache->display(), window,
+                                                  cache->IccProfile());
+    if (icc_profile_property.is_valid() && icc_profile_property.size() > 0) {
+      icc_profile_ = std::vector<uint8_t>(
+          icc_profile_property.data(),
+          icc_profile_property.data() + icc_profile_property.size());
+    } else {
+      RTC_LOG(LS_WARNING) << "Failed to get icc profile";
+    }
+  }
+
+  window_ = window;
+  InitShm(attributes);
+
+  return true;
+}
+
+void XServerPixelBuffer::InitShm(const XWindowAttributes& attributes) {
+  Visual* default_visual = attributes.visual;
+  int default_depth = attributes.depth;
+
+  int major, minor;
+  Bool have_pixmaps;
+  if (!XShmQueryVersion(display_, &major, &minor, &have_pixmaps)) {
+    // Shared memory not supported. CaptureRect will use the XImage API instead.
+    return;
+  }
+
+  bool using_shm = false;
+  shm_segment_info_ = new XShmSegmentInfo;
+  shm_segment_info_->shmid = -1;
+  shm_segment_info_->shmaddr = nullptr;
+  shm_segment_info_->readOnly = False;
+  x_shm_image_ = XShmCreateImage(display_, default_visual, default_depth,
+                                 ZPixmap, 0, shm_segment_info_,
+                                 window_rect_.width(), window_rect_.height());
+  if (x_shm_image_) {
+    shm_segment_info_->shmid =
+        shmget(IPC_PRIVATE, x_shm_image_->bytes_per_line * x_shm_image_->height,
+               IPC_CREAT | 0600);
+    if (shm_segment_info_->shmid != -1) {
+      void* shmat_result = shmat(shm_segment_info_->shmid, 0, 0);
+      if (shmat_result != reinterpret_cast<void*>(-1)) {
+        shm_segment_info_->shmaddr = reinterpret_cast<char*>(shmat_result);
+        x_shm_image_->data = shm_segment_info_->shmaddr;
+
+        XErrorTrap error_trap(display_);
+        using_shm = XShmAttach(display_, shm_segment_info_);
+        XSync(display_, False);
+        if (error_trap.GetLastErrorAndDisable() != 0)
+          using_shm = false;
+        if (using_shm) {
+          RTC_LOG(LS_VERBOSE)
+              << "Using X shared memory segment " << shm_segment_info_->shmid;
+        }
+      }
+    } else {
+      RTC_LOG(LS_WARNING) << "Failed to get shared memory segment. "
+                             "Performance may be degraded.";
+    }
+  }
+
+  if (!using_shm) {
+    RTC_LOG(LS_WARNING)
+        << "Not using shared memory. Performance may be degraded.";
+    ReleaseSharedMemorySegment();
+    return;
+  }
+
+  if (have_pixmaps)
+    have_pixmaps = InitPixmaps(default_depth);
+
+  shmctl(shm_segment_info_->shmid, IPC_RMID, 0);
+  shm_segment_info_->shmid = -1;
+
+  RTC_LOG(LS_VERBOSE) << "Using X shared memory extension v" << major << "."
+                      << minor << " with" << (have_pixmaps ? "" : "out")
+                      << " pixmaps.";
+}
+
+bool XServerPixelBuffer::InitPixmaps(int depth) {
+  if (XShmPixmapFormat(display_) != ZPixmap)
+    return false;
+
+  {
+    XErrorTrap error_trap(display_);
+    shm_pixmap_ = XShmCreatePixmap(
+        display_, window_, shm_segment_info_->shmaddr, shm_segment_info_,
+        window_rect_.width(), window_rect_.height(), depth);
+    XSync(display_, False);
+    if (error_trap.GetLastErrorAndDisable() != 0) {
+      // `shm_pixmap_` is not not valid because the request was not processed
+      // by the X Server, so zero it.
+      shm_pixmap_ = 0;
+      return false;
+    }
+  }
+
+  {
+    XErrorTrap error_trap(display_);
+    XGCValues shm_gc_values;
+    shm_gc_values.subwindow_mode = IncludeInferiors;
+    shm_gc_values.graphics_exposures = False;
+    shm_gc_ = XCreateGC(display_, window_,
+                        GCSubwindowMode | GCGraphicsExposures, &shm_gc_values);
+    XSync(display_, False);
+    if (error_trap.GetLastErrorAndDisable() != 0) {
+      XFreePixmap(display_, shm_pixmap_);
+      shm_pixmap_ = 0;
+      shm_gc_ = 0;  // See shm_pixmap_ comment above.
+      return false;
+    }
+  }
+
+  return true;
+}
+
+bool XServerPixelBuffer::IsWindowValid() const {
+  XWindowAttributes attributes;
+  {
+    XErrorTrap error_trap(display_);
+    if (!XGetWindowAttributes(display_, window_, &attributes) ||
+        error_trap.GetLastErrorAndDisable() != 0) {
+      return false;
+    }
+  }
+  return true;
+}
+
+void XServerPixelBuffer::Synchronize() {
+  if (shm_segment_info_ && !shm_pixmap_) {
+    // XShmGetImage can fail if the display is being reconfigured.
+    XErrorTrap error_trap(display_);
+    // XShmGetImage fails if the window is partially out of screen.
+    xshm_get_image_succeeded_ =
+        XShmGetImage(display_, window_, x_shm_image_, 0, 0, AllPlanes);
+  }
+}
+
+bool XServerPixelBuffer::CaptureRect(const DesktopRect& rect,
+                                     DesktopFrame* frame) {
+  RTC_DCHECK_LE(rect.right(), window_rect_.width());
+  RTC_DCHECK_LE(rect.bottom(), window_rect_.height());
+
+  XImage* image;
+  uint8_t* data;
+
+  if (shm_segment_info_ && (shm_pixmap_ || xshm_get_image_succeeded_)) {
+    if (shm_pixmap_) {
+      XCopyArea(display_, window_, shm_pixmap_, shm_gc_, rect.left(),
+                rect.top(), rect.width(), rect.height(), rect.left(),
+                rect.top());
+      XSync(display_, False);
+    }
+
+    image = x_shm_image_;
+    data = reinterpret_cast<uint8_t*>(image->data) +
+           rect.top() * image->bytes_per_line +
+           rect.left() * image->bits_per_pixel / 8;
+
+  } else {
+    if (x_image_)
+      XDestroyImage(x_image_);
+    x_image_ = XGetImage(display_, window_, rect.left(), rect.top(),
+                         rect.width(), rect.height(), AllPlanes, ZPixmap);
+    if (!x_image_)
+      return false;
+
+    image = x_image_;
+    data = reinterpret_cast<uint8_t*>(image->data);
+  }
+
+  if (IsXImageRGBFormat(image)) {
+    FastBlit(image, data, rect, frame);
+  } else {
+    SlowBlit(image, data, rect, frame);
+  }
+
+  if (!icc_profile_.empty())
+    frame->set_icc_profile(icc_profile_);
+
+  return true;
+}
+
+}  // namespace webrtc

TMessagesProj/jni/voip/webrtc/modules/desktop_capture/linux/x11/x_server_pixel_buffer.h

@@ -0,0 +1,89 @@
+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// Don't include this file in any .h files because it pulls in some X headers.
+
+#ifndef MODULES_DESKTOP_CAPTURE_LINUX_X11_X_SERVER_PIXEL_BUFFER_H_
+#define MODULES_DESKTOP_CAPTURE_LINUX_X11_X_SERVER_PIXEL_BUFFER_H_
+
+#include <X11/Xutil.h>
+#include <X11/extensions/XShm.h>
+
+#include <memory>
+#include <vector>
+
+#include "modules/desktop_capture/desktop_geometry.h"
+
+namespace webrtc {
+
+class DesktopFrame;
+class XAtomCache;
+
+// A class to allow the X server's pixel buffer to be accessed as efficiently
+// as possible.
+class XServerPixelBuffer {
+ public:
+  XServerPixelBuffer();
+  ~XServerPixelBuffer();
+
+  XServerPixelBuffer(const XServerPixelBuffer&) = delete;
+  XServerPixelBuffer& operator=(const XServerPixelBuffer&) = delete;
+
+  void Release();
+
+  // Allocate (or reallocate) the pixel buffer for `window`. Returns false in
+  // case of an error (e.g. window doesn't exist).
+  bool Init(XAtomCache* cache, Window window);
+
+  bool is_initialized() { return window_ != 0; }
+
+  // Returns the size of the window the buffer was initialized for.
+  DesktopSize window_size() { return window_rect_.size(); }
+
+  // Returns the rectangle of the window the buffer was initialized for.
+  const DesktopRect& window_rect() { return window_rect_; }
+
+  // Returns true if the window can be found.
+  bool IsWindowValid() const;
+
+  // If shared memory is being used without pixmaps, synchronize this pixel
+  // buffer with the root window contents (otherwise, this is a no-op).
+  // This is to avoid doing a full-screen capture for each individual
+  // rectangle in the capture list, when it only needs to be done once at the
+  // beginning.
+  void Synchronize();
+
+  // Capture the specified rectangle and stores it in the `frame`. In the case
+  // where the full-screen data is captured by Synchronize(), this simply
+  // returns the pointer without doing any more work. The caller must ensure
+  // that `rect` is not larger than window_size().
+  bool CaptureRect(const DesktopRect& rect, DesktopFrame* frame);
+
+ private:
+  void ReleaseSharedMemorySegment();
+
+  void InitShm(const XWindowAttributes& attributes);
+  bool InitPixmaps(int depth);
+
+  Display* display_ = nullptr;
+  Window window_ = 0;
+  DesktopRect window_rect_;
+  XImage* x_image_ = nullptr;
+  XShmSegmentInfo* shm_segment_info_ = nullptr;
+  XImage* x_shm_image_ = nullptr;
+  Pixmap shm_pixmap_ = 0;
+  GC shm_gc_ = nullptr;
+  bool xshm_get_image_succeeded_ = false;
+  std::vector<uint8_t> icc_profile_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_LINUX_X11_X_SERVER_PIXEL_BUFFER_H_

TMessagesProj/jni/voip/webrtc/modules/desktop_capture/linux/x11/x_window_property.cc

@@ -0,0 +1,43 @@
+/*
+ *  Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "modules/desktop_capture/linux/x11/x_window_property.h"
+
+namespace webrtc {
+
+XWindowPropertyBase::XWindowPropertyBase(Display* display,
+                                         Window window,
+                                         Atom property,
+                                         int expected_size) {
+  const int kBitsPerByte = 8;
+  Atom actual_type;
+  int actual_format;
+  unsigned long bytes_after;  // NOLINT: type required by XGetWindowProperty
+  int status = XGetWindowProperty(display, window, property, 0L, ~0L, False,
+                                  AnyPropertyType, &actual_type, &actual_format,
+                                  &size_, &bytes_after, &data_);
+  if (status != Success) {
+    data_ = nullptr;
+    return;
+  }
+  if ((expected_size * kBitsPerByte) != actual_format) {
+    size_ = 0;
+    return;
+  }
+
+  is_valid_ = true;
+}
+
+XWindowPropertyBase::~XWindowPropertyBase() {
+  if (data_)
+    XFree(data_);
+}
+
+}  // namespace webrtc

TMessagesProj/jni/voip/webrtc/modules/desktop_capture/linux/x11/x_window_property.h

@@ -0,0 +1,63 @@
+/*
+ *  Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef MODULES_DESKTOP_CAPTURE_LINUX_X11_X_WINDOW_PROPERTY_H_
+#define MODULES_DESKTOP_CAPTURE_LINUX_X11_X_WINDOW_PROPERTY_H_
+
+#include <X11/X.h>
+#include <X11/Xlib.h>
+
+namespace webrtc {
+
+class XWindowPropertyBase {
+ public:
+  XWindowPropertyBase(Display* display,
+                      Window window,
+                      Atom property,
+                      int expected_size);
+  virtual ~XWindowPropertyBase();
+
+  XWindowPropertyBase(const XWindowPropertyBase&) = delete;
+  XWindowPropertyBase& operator=(const XWindowPropertyBase&) = delete;
+
+  // True if we got properly value successfully.
+  bool is_valid() const { return is_valid_; }
+
+  // Size and value of the property.
+  size_t size() const { return size_; }
+
+ protected:
+  unsigned char* data_ = nullptr;
+
+ private:
+  bool is_valid_ = false;
+  unsigned long size_ = 0;  // NOLINT: type required by XGetWindowProperty
+};
+
+// Convenience wrapper for XGetWindowProperty() results.
+template <class PropertyType>
+class XWindowProperty : public XWindowPropertyBase {
+ public:
+  XWindowProperty(Display* display, const Window window, const Atom property)
+      : XWindowPropertyBase(display, window, property, sizeof(PropertyType)) {}
+  ~XWindowProperty() override = default;
+
+  XWindowProperty(const XWindowProperty&) = delete;
+  XWindowProperty& operator=(const XWindowProperty&) = delete;
+
+  const PropertyType* data() const {
+    return reinterpret_cast<PropertyType*>(data_);
+  }
+  PropertyType* data() { return reinterpret_cast<PropertyType*>(data_); }
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_LINUX_X11_X_WINDOW_PROPERTY_H_