native/temp_window_x11.cc

// Copyright (c) 2015 The Chromium Embedded Framework Authors. All rights
// reserved. Use of this source code is governed by a BSD-style license that
// can be found in the LICENSE file.

#include "temp_window_x11.h"

#include <X11/Xlib.h>

#include "include/base/cef_logging.h"
#include "include/cef_app.h"
#include "util.h"

namespace {

::Display* g_xdisplay = nullptr;
TempWindowX11* g_temp_window = nullptr;

// Create the temp window.
::Window CreateTempWindow() {
  ::Window parent_xwindow = DefaultRootWindow(g_xdisplay);

  XSetWindowAttributes swa;
  memset(&swa, 0, sizeof(swa));
  swa.background_pixmap = None;
  swa.override_redirect = false;
  return XCreateWindow(g_xdisplay, parent_xwindow, 0, 0, 1, 1,  // size (1x1px)
                       0,                                       // border width
                       CopyFromParent,                          // depth
                       InputOutput,
                       CopyFromParent,  // visual
                       CWBackPixmap | CWOverrideRedirect, &swa);
}

// Close the temp window.
void CloseTempWindow(::Window xwindow) {
  XDestroyWindow(g_xdisplay, xwindow);
}

}  // namespace

TempWindowX11::TempWindowX11() : xwindow_(kNullWindowHandle) {
  REQUIRE_UI_THREAD();

  g_xdisplay = cef_get_xdisplay();
  CHECK(g_xdisplay);

  DCHECK(!g_temp_window);
  g_temp_window = this;

  xwindow_ = CreateTempWindow();
  CHECK(xwindow_);
}

TempWindowX11::~TempWindowX11() {
  g_temp_window = nullptr;
  DCHECK(xwindow_);

  CloseTempWindow(xwindow_);
}

// static
CefWindowHandle TempWindowX11::GetWindowHandle() {
  if (!g_temp_window)
    return kNullWindowHandle;
  return g_temp_window->xwindow_;
}

// static
void* TempWindowX11::GetDisplay() {
  CHECK(g_xdisplay);
  return g_xdisplay;
}