417 lines
19 KiB
C++
417 lines
19 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2018 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qxcbconnection.h"
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#include "qxcbscreen.h"
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#include "qxcbintegration.h"
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#include <QtGui/private/qhighdpiscaling_p.h>
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#include <QtCore/QString>
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#include <QtCore/QList>
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#include <qpa/qwindowsysteminterface.h>
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#include <xcb/xinerama.h>
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void QXcbConnection::xrandrSelectEvents()
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{
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xcb_screen_iterator_t rootIter = xcb_setup_roots_iterator(setup());
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for (; rootIter.rem; xcb_screen_next(&rootIter)) {
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xcb_randr_select_input(xcb_connection(),
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rootIter.data->root,
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XCB_RANDR_NOTIFY_MASK_SCREEN_CHANGE |
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XCB_RANDR_NOTIFY_MASK_OUTPUT_CHANGE |
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XCB_RANDR_NOTIFY_MASK_CRTC_CHANGE |
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XCB_RANDR_NOTIFY_MASK_OUTPUT_PROPERTY
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);
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}
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}
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QXcbScreen* QXcbConnection::findScreenForCrtc(xcb_window_t rootWindow, xcb_randr_crtc_t crtc) const
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{
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for (QXcbScreen *screen : m_screens) {
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if (screen->root() == rootWindow && screen->crtc() == crtc)
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return screen;
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}
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return nullptr;
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}
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QXcbScreen* QXcbConnection::findScreenForOutput(xcb_window_t rootWindow, xcb_randr_output_t output) const
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{
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for (QXcbScreen *screen : m_screens) {
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if (screen->root() == rootWindow && screen->output() == output)
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return screen;
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}
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return nullptr;
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}
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QXcbVirtualDesktop* QXcbConnection::virtualDesktopForRootWindow(xcb_window_t rootWindow) const
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{
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for (QXcbVirtualDesktop *virtualDesktop : m_virtualDesktops) {
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if (virtualDesktop->screen()->root == rootWindow)
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return virtualDesktop;
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}
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return nullptr;
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}
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/*!
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\brief Synchronizes the screen list, adds new screens, removes deleted ones
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*/
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void QXcbConnection::updateScreens(const xcb_randr_notify_event_t *event)
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{
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if (event->subCode == XCB_RANDR_NOTIFY_CRTC_CHANGE) {
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xcb_randr_crtc_change_t crtc = event->u.cc;
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QXcbVirtualDesktop *virtualDesktop = virtualDesktopForRootWindow(crtc.window);
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if (!virtualDesktop)
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// Not for us
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return;
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QXcbScreen *screen = findScreenForCrtc(crtc.window, crtc.crtc);
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qCDebug(lcQpaScreen) << "QXcbConnection: XCB_RANDR_NOTIFY_CRTC_CHANGE:" << crtc.crtc
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<< "mode" << crtc.mode << "relevant screen" << screen;
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// Only update geometry when there's a valid mode on the CRTC
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// CRTC with node mode could mean that output has been disabled, and we'll
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// get RRNotifyOutputChange notification for that.
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if (screen && crtc.mode) {
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if (crtc.rotation == XCB_RANDR_ROTATION_ROTATE_90 ||
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crtc.rotation == XCB_RANDR_ROTATION_ROTATE_270)
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std::swap(crtc.width, crtc.height);
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screen->updateGeometry(QRect(crtc.x, crtc.y, crtc.width, crtc.height), crtc.rotation);
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if (screen->mode() != crtc.mode)
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screen->updateRefreshRate(crtc.mode);
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}
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} else if (event->subCode == XCB_RANDR_NOTIFY_OUTPUT_CHANGE) {
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xcb_randr_output_change_t output = event->u.oc;
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QXcbVirtualDesktop *virtualDesktop = virtualDesktopForRootWindow(output.window);
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if (!virtualDesktop)
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// Not for us
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return;
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QXcbScreen *screen = findScreenForOutput(output.window, output.output);
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qCDebug(lcQpaScreen) << "QXcbConnection: XCB_RANDR_NOTIFY_OUTPUT_CHANGE:" << output.output;
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if (screen && output.connection == XCB_RANDR_CONNECTION_DISCONNECTED) {
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qCDebug(lcQpaScreen) << "screen" << screen->name() << "has been disconnected";
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destroyScreen(screen);
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} else if (!screen && output.connection == XCB_RANDR_CONNECTION_CONNECTED) {
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// New XRandR output is available and it's enabled
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if (output.crtc != XCB_NONE && output.mode != XCB_NONE) {
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auto outputInfo = Q_XCB_REPLY(xcb_randr_get_output_info, xcb_connection(),
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output.output, output.config_timestamp);
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// Find a fake screen
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const auto scrs = virtualDesktop->screens();
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for (QPlatformScreen *scr : scrs) {
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QXcbScreen *xcbScreen = static_cast<QXcbScreen *>(scr);
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if (xcbScreen->output() == XCB_NONE) {
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screen = xcbScreen;
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break;
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}
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}
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if (screen) {
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QString nameWas = screen->name();
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// Transform the fake screen into a physical screen
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screen->setOutput(output.output, outputInfo.get());
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updateScreen(screen, output);
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qCDebug(lcQpaScreen) << "output" << screen->name()
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<< "is connected and enabled; was fake:" << nameWas;
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} else {
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screen = createScreen(virtualDesktop, output, outputInfo.get());
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qCDebug(lcQpaScreen) << "output" << screen->name() << "is connected and enabled";
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}
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QHighDpiScaling::updateHighDpiScaling();
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}
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} else if (screen) {
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if (output.crtc == XCB_NONE && output.mode == XCB_NONE) {
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// Screen has been disabled
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auto outputInfo = Q_XCB_REPLY(xcb_randr_get_output_info, xcb_connection(),
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output.output, output.config_timestamp);
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if (outputInfo->crtc == XCB_NONE) {
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qCDebug(lcQpaScreen) << "output" << screen->name() << "has been disabled";
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destroyScreen(screen);
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} else {
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qCDebug(lcQpaScreen) << "output" << screen->name() << "has been temporarily disabled for the mode switch";
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// Reset crtc to skip RRCrtcChangeNotify events,
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// because they may be invalid in the middle of the mode switch
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screen->setCrtc(XCB_NONE);
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}
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} else {
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updateScreen(screen, output);
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qCDebug(lcQpaScreen) << "output has changed" << screen;
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}
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}
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qCDebug(lcQpaScreen) << "primary output is" << qAsConst(m_screens).first()->name();
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}
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}
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bool QXcbConnection::checkOutputIsPrimary(xcb_window_t rootWindow, xcb_randr_output_t output)
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{
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auto primary = Q_XCB_REPLY(xcb_randr_get_output_primary, xcb_connection(), rootWindow);
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if (!primary)
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qWarning("failed to get the primary output of the screen");
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const bool isPrimary = primary ? (primary->output == output) : false;
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return isPrimary;
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}
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void QXcbConnection::updateScreen(QXcbScreen *screen, const xcb_randr_output_change_t &outputChange)
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{
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screen->setCrtc(outputChange.crtc); // Set the new crtc, because it can be invalid
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screen->updateGeometry(outputChange.config_timestamp);
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if (screen->mode() != outputChange.mode)
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screen->updateRefreshRate(outputChange.mode);
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// Only screen which belongs to the primary virtual desktop can be a primary screen
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if (screen->screenNumber() == primaryScreenNumber()) {
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if (!screen->isPrimary() && checkOutputIsPrimary(outputChange.window, outputChange.output)) {
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screen->setPrimary(true);
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// If the screen became primary, reshuffle the order in QGuiApplicationPrivate
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const int idx = m_screens.indexOf(screen);
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if (idx > 0) {
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qAsConst(m_screens).first()->setPrimary(false);
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m_screens.swapItemsAt(0, idx);
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}
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screen->virtualDesktop()->setPrimaryScreen(screen);
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QWindowSystemInterface::handlePrimaryScreenChanged(screen);
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}
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}
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}
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QXcbScreen *QXcbConnection::createScreen(QXcbVirtualDesktop *virtualDesktop,
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const xcb_randr_output_change_t &outputChange,
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xcb_randr_get_output_info_reply_t *outputInfo)
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{
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QXcbScreen *screen = new QXcbScreen(this, virtualDesktop, outputChange.output, outputInfo);
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// Only screen which belongs to the primary virtual desktop can be a primary screen
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if (screen->screenNumber() == primaryScreenNumber())
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screen->setPrimary(checkOutputIsPrimary(outputChange.window, outputChange.output));
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if (screen->isPrimary()) {
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if (!m_screens.isEmpty())
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qAsConst(m_screens).first()->setPrimary(false);
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m_screens.prepend(screen);
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} else {
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m_screens.append(screen);
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}
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virtualDesktop->addScreen(screen);
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QWindowSystemInterface::handleScreenAdded(screen, screen->isPrimary());
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return screen;
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}
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void QXcbConnection::destroyScreen(QXcbScreen *screen)
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{
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QXcbVirtualDesktop *virtualDesktop = screen->virtualDesktop();
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if (virtualDesktop->screens().count() == 1) {
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// If there are no other screens on the same virtual desktop,
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// then transform the physical screen into a fake screen.
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const QString nameWas = screen->name();
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screen->setOutput(XCB_NONE, nullptr);
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qCDebug(lcQpaScreen) << "transformed" << nameWas << "to fake" << screen;
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} else {
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// There is more than one screen on the same virtual desktop, remove the screen
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m_screens.removeOne(screen);
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virtualDesktop->removeScreen(screen);
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// When primary screen is removed, set the new primary screen
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// which belongs to the primary virtual desktop.
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if (screen->isPrimary()) {
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QXcbScreen *newPrimary = static_cast<QXcbScreen *>(virtualDesktop->screens().at(0));
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newPrimary->setPrimary(true);
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const int idx = m_screens.indexOf(newPrimary);
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if (idx > 0)
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m_screens.swapItemsAt(0, idx);
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QWindowSystemInterface::handlePrimaryScreenChanged(newPrimary);
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}
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QWindowSystemInterface::handleScreenRemoved(screen);
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}
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}
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void QXcbConnection::initializeScreens()
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{
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xcb_screen_iterator_t it = xcb_setup_roots_iterator(setup());
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int xcbScreenNumber = 0; // screen number in the xcb sense
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QXcbScreen *primaryScreen = nullptr;
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while (it.rem) {
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// Each "screen" in xcb terminology is a virtual desktop,
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// potentially a collection of separate juxtaposed monitors.
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// But we want a separate QScreen for each output (e.g. DVI-I-1, VGA-1, etc.)
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// which will become virtual siblings.
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xcb_screen_t *xcbScreen = it.data;
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QXcbVirtualDesktop *virtualDesktop = new QXcbVirtualDesktop(this, xcbScreen, xcbScreenNumber);
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m_virtualDesktops.append(virtualDesktop);
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QList<QPlatformScreen *> siblings;
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if (hasXRandr()) {
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// RRGetScreenResourcesCurrent is fast but it may return nothing if the
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// configuration is not initialized wrt to the hardware. We should call
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// RRGetScreenResources in this case.
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auto resources_current = Q_XCB_REPLY(xcb_randr_get_screen_resources_current,
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xcb_connection(), xcbScreen->root);
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if (!resources_current) {
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qWarning("failed to get the current screen resources");
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} else {
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xcb_timestamp_t timestamp = 0;
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xcb_randr_output_t *outputs = nullptr;
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int outputCount = xcb_randr_get_screen_resources_current_outputs_length(resources_current.get());
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if (outputCount) {
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timestamp = resources_current->config_timestamp;
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outputs = xcb_randr_get_screen_resources_current_outputs(resources_current.get());
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} else {
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auto resources = Q_XCB_REPLY(xcb_randr_get_screen_resources,
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xcb_connection(), xcbScreen->root);
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if (!resources) {
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qWarning("failed to get the screen resources");
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} else {
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timestamp = resources->config_timestamp;
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outputCount = xcb_randr_get_screen_resources_outputs_length(resources.get());
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outputs = xcb_randr_get_screen_resources_outputs(resources.get());
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}
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}
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if (outputCount) {
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auto primary = Q_XCB_REPLY(xcb_randr_get_output_primary, xcb_connection(), xcbScreen->root);
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if (!primary) {
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qWarning("failed to get the primary output of the screen");
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} else {
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for (int i = 0; i < outputCount; i++) {
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auto output = Q_XCB_REPLY_UNCHECKED(xcb_randr_get_output_info,
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xcb_connection(), outputs[i], timestamp);
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// Invalid, disconnected or disabled output
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if (!output)
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continue;
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if (output->connection != XCB_RANDR_CONNECTION_CONNECTED) {
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qCDebug(lcQpaScreen, "Output %s is not connected", qPrintable(
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QString::fromUtf8((const char*)xcb_randr_get_output_info_name(output.get()),
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xcb_randr_get_output_info_name_length(output.get()))));
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continue;
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}
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if (output->crtc == XCB_NONE) {
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qCDebug(lcQpaScreen, "Output %s is not enabled", qPrintable(
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QString::fromUtf8((const char*)xcb_randr_get_output_info_name(output.get()),
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xcb_randr_get_output_info_name_length(output.get()))));
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continue;
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}
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QXcbScreen *screen = new QXcbScreen(this, virtualDesktop, outputs[i], output.get());
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siblings << screen;
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m_screens << screen;
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// There can be multiple outputs per screen, use either
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// the first or an exact match. An exact match isn't
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// always available if primary->output is XCB_NONE
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// or currently disconnected output.
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if (primaryScreenNumber() == xcbScreenNumber) {
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if (!primaryScreen || (primary && outputs[i] == primary->output)) {
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if (primaryScreen)
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primaryScreen->setPrimary(false);
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primaryScreen = screen;
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primaryScreen->setPrimary(true);
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siblings.prepend(siblings.takeLast());
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}
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}
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}
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}
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}
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}
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} else if (hasXinerama()) {
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// Xinerama is available
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auto screens = Q_XCB_REPLY(xcb_xinerama_query_screens, xcb_connection());
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if (screens) {
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xcb_xinerama_screen_info_iterator_t it = xcb_xinerama_query_screens_screen_info_iterator(screens.get());
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while (it.rem) {
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xcb_xinerama_screen_info_t *screen_info = it.data;
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QXcbScreen *screen = new QXcbScreen(this, virtualDesktop,
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XCB_NONE, nullptr,
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screen_info, it.index);
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siblings << screen;
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m_screens << screen;
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xcb_xinerama_screen_info_next(&it);
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}
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}
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}
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if (siblings.isEmpty()) {
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// If there are no XRandR outputs or XRandR extension is missing,
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// then create a fake/legacy screen.
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QXcbScreen *screen = new QXcbScreen(this, virtualDesktop, XCB_NONE, nullptr);
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qCDebug(lcQpaScreen) << "created fake screen" << screen;
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m_screens << screen;
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if (primaryScreenNumber() == xcbScreenNumber) {
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primaryScreen = screen;
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primaryScreen->setPrimary(true);
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}
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siblings << screen;
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}
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virtualDesktop->setScreens(std::move(siblings));
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xcb_screen_next(&it);
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++xcbScreenNumber;
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} // for each xcb screen
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for (QXcbVirtualDesktop *virtualDesktop : qAsConst(m_virtualDesktops))
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virtualDesktop->subscribeToXFixesSelectionNotify();
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if (m_virtualDesktops.isEmpty()) {
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qFatal("QXcbConnection: no screens available");
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} else {
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// Ensure the primary screen is first on the list
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if (primaryScreen) {
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if (qAsConst(m_screens).first() != primaryScreen) {
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m_screens.removeOne(primaryScreen);
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m_screens.prepend(primaryScreen);
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}
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}
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// Push the screens to QGuiApplication
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for (QXcbScreen *screen : qAsConst(m_screens)) {
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qCDebug(lcQpaScreen) << "adding" << screen << "(Primary:" << screen->isPrimary() << ")";
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QWindowSystemInterface::handleScreenAdded(screen, screen->isPrimary());
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}
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qCDebug(lcQpaScreen) << "primary output is" << qAsConst(m_screens).first()->name();
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}
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}
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