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Diffstat (limited to '')
| -rw-r--r-- | src/VBox/Additions/x11/VBoxClient/display-helper-generic.cpp | 421 |
1 files changed, 421 insertions, 0 deletions
diff --git a/src/VBox/Additions/x11/VBoxClient/display-helper-generic.cpp b/src/VBox/Additions/x11/VBoxClient/display-helper-generic.cpp new file mode 100644 index 00000000..c9471681 --- /dev/null +++ b/src/VBox/Additions/x11/VBoxClient/display-helper-generic.cpp @@ -0,0 +1,421 @@ +/* $Id: display-helper-generic.cpp $ */ +/** @file + * Guest Additions - Generic Desktop Environment helper. + * + * A generic helper for X11 Client which performs Desktop Environment + * specific actions utilizing libXrandr. + */ + +/* + * Copyright (C) 2006-2022 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * SPDX-License-Identifier: GPL-3.0-only + */ + +#include "VBoxClient.h" +#include "display-helper.h" + +#include <stdio.h> +#include <stdlib.h> + +#include <VBox/log.h> +#include <VBox/xrandr.h> + +#include <iprt/errcore.h> +#include <iprt/asm.h> +#include <iprt/thread.h> +#include <iprt/mem.h> +#include <iprt/list.h> + +/** Load libxrandr symbols needed for us. */ +#include <VBox/xrandr.h> +/* Declarations of the functions that we need from libXrandr. */ +#define VBOX_XRANDR_GENERATE_BODY +#include <VBox/xrandr-calls.h> + +#include <X11/Xlibint.h> + +/** Name of Display Change Monitor thread. */ +#define VBCL_HLP_DCM_THREAD_NAME "dcm-task" + +/** Display Change Monitor thread. */ +static RTTHREAD g_vbclHlpGenericDcmThread = NIL_RTTHREAD; + +/** Global flag which is triggered when service requested to shutdown. */ +static bool volatile g_fShutdown; + +/** Node of monitors info list. */ +typedef struct vbcl_hlp_generic_monitor_list_t +{ + /** List node. */ + RTLISTNODE Node; + /** Pointer to xRandr monitor info. */ + XRRMonitorInfo *pMonitorInfo; +} vbcl_hlp_generic_monitor_list_t; + +/** Pointer to display change event notification callback (set by external function call). */ +static FNDISPLAYOFFSETCHANGE *g_pfnDisplayOffsetChangeCb; + +/** + * Determine monitor name strings order in a list of monitors which is sorted in ascending way. + * + * @return TRUE if first name should go first in a list, FALSE otherwise. + * @param pszName1 First monitor name. + * @param pszName2 Second monitor name. + */ +static bool vbcl_hlp_generic_order_names(char *pszName1, char *pszName2) +{ + AssertReturn(pszName1, false); + AssertReturn(pszName2, false); + + char *pszFirst = pszName1; + char *pszSecond = pszName2; + + while (*pszFirst && *pszSecond) + { + if (*pszFirst < *pszSecond) + return true; + + pszFirst++; + pszSecond++; + } + + return false; +} + +/** + * Insert monitor info into the list sorted ascending. + * + * @return IPRT status code. + * @param pDisplay X11 display handle to fetch monitor name string from. + * @param pListHead Head of monitors info list. + * @param pMonitorInfo Monitor info ti be inserted into the list. + */ +static int vbcl_hlp_generic_monitor_list_insert_sorted( + Display *pDisplay, vbcl_hlp_generic_monitor_list_t *pListHead, XRRMonitorInfo *pMonitorInfo) +{ + vbcl_hlp_generic_monitor_list_t *pNode = (vbcl_hlp_generic_monitor_list_t *)RTMemAllocZ(sizeof(vbcl_hlp_generic_monitor_list_t)); + vbcl_hlp_generic_monitor_list_t *pNodeIter; + char *pszMonitorName; + + AssertReturn(pNode, VERR_NO_MEMORY); + + pNode->pMonitorInfo = pMonitorInfo; + + if (RTListIsEmpty(&pListHead->Node)) + { + RTListNodeInsertAfter(&pListHead->Node, &pNode->Node); + return VINF_SUCCESS; + } + + pszMonitorName = XGetAtomName(pDisplay, pMonitorInfo->name); + AssertReturn(pszMonitorName, VERR_NO_MEMORY); + + RTListForEach(&pListHead->Node, pNodeIter, vbcl_hlp_generic_monitor_list_t, Node) + { + char *pszIterMonitorName = XGetAtomName(pDisplay, pNodeIter->pMonitorInfo->name); + + if (vbcl_hlp_generic_order_names(pszMonitorName, pszIterMonitorName)) + { + RTListNodeInsertBefore(&pNodeIter->Node, &pNode->Node); + XFree((void *)pszIterMonitorName); + XFree((void *)pszMonitorName); + return VINF_SUCCESS; + } + + XFree((void *)pszIterMonitorName); + } + + XFree((void *)pszMonitorName); + + /* If we reached the end of the list, it means that monitor + * should be placed in the end (according to alphabetical sorting). */ + RTListNodeInsertBefore(&pNodeIter->Node, &pNode->Node); + + return VINF_SUCCESS; +} + +/** + * Release monitors info list resources. + * + * @param pListHead List head. + */ +static void vbcl_hlp_generic_free_monitor_list(vbcl_hlp_generic_monitor_list_t *pListHead) +{ + vbcl_hlp_generic_monitor_list_t *pEntry, *pNextEntry; + + RTListForEachSafe(&pListHead->Node, pEntry, pNextEntry, vbcl_hlp_generic_monitor_list_t, Node) + { + RTListNodeRemove(&pEntry->Node); + RTMemFree(pEntry); + } +} + +/** + * Handle received RRScreenChangeNotify event. + * + * @param pDisplay X11 display handle. + */ +static void vbcl_hlp_generic_process_display_change_event(Display *pDisplay) +{ + int iCount; + uint32_t idxDisplay = 0; + XRRMonitorInfo *pMonitorsInfo = XRRGetMonitors(pDisplay, DefaultRootWindow(pDisplay), true, &iCount); + if (pMonitorsInfo && iCount > 0 && iCount < VBOX_DRMIPC_MONITORS_MAX) + { + int rc; + vbcl_hlp_generic_monitor_list_t pMonitorsInfoList, *pIter; + struct VBOX_DRMIPC_VMWRECT aDisplays[VBOX_DRMIPC_MONITORS_MAX]; + + RTListInit(&pMonitorsInfoList.Node); + + /* Put monitors info into sorted (by monitor name) list. */ + for (int i = 0; i < iCount; i++) + { + rc = vbcl_hlp_generic_monitor_list_insert_sorted(pDisplay, &pMonitorsInfoList, &pMonitorsInfo[i]); + if (RT_FAILURE(rc)) + { + VBClLogError("unable to fill monitors info list, rc=%Rrc\n", rc); + break; + } + } + + /* Now iterate over sorted list of monitor configurations. */ + RTListForEach(&pMonitorsInfoList.Node, pIter, vbcl_hlp_generic_monitor_list_t, Node) + { + char *pszMonitorName = XGetAtomName(pDisplay, pIter->pMonitorInfo->name); + + VBClLogVerbose(1, "reporting monitor %s offset: (%d, %d)\n", + pszMonitorName, pIter->pMonitorInfo->x, pIter->pMonitorInfo->y); + + XFree((void *)pszMonitorName); + + aDisplays[idxDisplay].x = pIter->pMonitorInfo->x; + aDisplays[idxDisplay].y = pIter->pMonitorInfo->y; + aDisplays[idxDisplay].w = pIter->pMonitorInfo->width; + aDisplays[idxDisplay].h = pIter->pMonitorInfo->height; + + idxDisplay++; + } + + vbcl_hlp_generic_free_monitor_list(&pMonitorsInfoList); + + XRRFreeMonitors(pMonitorsInfo); + + if (g_pfnDisplayOffsetChangeCb) + { + rc = g_pfnDisplayOffsetChangeCb(idxDisplay, aDisplays); + if (RT_FAILURE(rc)) + VBClLogError("unable to notify subscriber about monitors info change, rc=%Rrc\n", rc); + } + } + else + VBClLogError("cannot get monitors info\n"); +} + +/** Worker thread for display change events monitoring. */ +static DECLCALLBACK(int) vbcl_hlp_generic_display_change_event_monitor_worker(RTTHREAD ThreadSelf, void *pvUser) +{ + int rc = VERR_GENERAL_FAILURE; + + RT_NOREF(pvUser); + + VBClLogVerbose(1, "vbcl_hlp_generic_display_change_event_monitor_worker started\n"); + + Display *pDisplay = XOpenDisplay(NULL); + if (pDisplay) + { + bool fSuccess; + int iEventBase, iErrorBase /* unused */, iMajor, iMinor; + + fSuccess = XRRQueryExtension(pDisplay, &iEventBase, &iErrorBase); + fSuccess &= XRRQueryVersion(pDisplay, &iMajor, &iMinor); + + if (fSuccess && iMajor >= 1 && iMinor > 3) + { + /* All required checks are now passed. Notify parent thread that we started. */ + RTThreadUserSignal(ThreadSelf); + + /* Only receive events we need. */ + XRRSelectInput(pDisplay, DefaultRootWindow(pDisplay), RRScreenChangeNotifyMask); + + /* Monitor main loop. */ + while (!ASMAtomicReadBool(&g_fShutdown)) + { + XEvent Event; + + if (XPending(pDisplay) > 0) + { + XNextEvent(pDisplay, &Event); + switch (Event.type - iEventBase) + { + case RRScreenChangeNotify: + { + vbcl_hlp_generic_process_display_change_event(pDisplay); + break; + } + + default: + break; + } + } + else + RTThreadSleep(RT_MS_1SEC / 2); + } + } + else + { + VBClLogError("dcm monitor cannot find XRandr 1.3+ extension\n"); + rc = VERR_NOT_AVAILABLE; + } + + XCloseDisplay(pDisplay); + } + else + { + VBClLogError("dcm monitor cannot open X Display\n"); + rc = VERR_NOT_AVAILABLE; + } + + VBClLogVerbose(1, "vbcl_hlp_generic_display_change_event_monitor_worker ended\n"); + + return rc; +} + +static void vbcl_hlp_generic_start_display_change_monitor() +{ + int rc; + + rc = RTXrandrLoadLib(); + if (RT_SUCCESS(rc)) + { + /* Start thread which will monitor display change events. */ + rc = RTThreadCreate(&g_vbclHlpGenericDcmThread, vbcl_hlp_generic_display_change_event_monitor_worker, (void *)NULL, 0, + RTTHREADTYPE_DEFAULT, RTTHREADFLAGS_WAITABLE, VBCL_HLP_DCM_THREAD_NAME); + if (RT_SUCCESS(rc)) + { + rc = RTThreadUserWait(g_vbclHlpGenericDcmThread, RT_MS_5SEC); + } + else + g_vbclHlpGenericDcmThread = NIL_RTTHREAD; + + VBClLogInfo("attempt to start display change monitor thread, rc=%Rrc\n", rc); + + } + else + VBClLogInfo("libXrandr not available, will not monitor display change events, rc=%Rrc\n", rc); +} + +/** + * @interface_method_impl{VBCLDISPLAYHELPER,pfnSetPrimaryDisplay} + */ +static DECLCALLBACK(int) vbcl_hlp_generic_set_primary_display(uint32_t idDisplay) +{ + XRRScreenResources *pScreenResources; + Display *pDisplay; + + int rc = VERR_INVALID_PARAMETER; + + pDisplay = XOpenDisplay(NULL); + if (pDisplay) + { + pScreenResources = XRRGetScreenResources(pDisplay, DefaultRootWindow(pDisplay)); + if (pScreenResources) + { + if ((int)idDisplay < pScreenResources->noutput) + { + XRRSetOutputPrimary(pDisplay, DefaultRootWindow(pDisplay), pScreenResources->outputs[idDisplay]); + VBClLogInfo("display %u has been set as primary\n", idDisplay); + rc = VINF_SUCCESS; + } + else + VBClLogError("cannot set display %u as primary: index out of range\n", idDisplay); + + XRRFreeScreenResources(pScreenResources); + } + else + VBClLogError("cannot set display %u as primary: libXrandr can not get screen resources\n", idDisplay); + + XCloseDisplay(pDisplay); + } + else + VBClLogError("cannot set display %u as primary: cannot connect to X11\n", idDisplay); + + return rc; +} + +/** + * @interface_method_impl{VBCLDISPLAYHELPER,pfnProbe} + */ +static DECLCALLBACK(int) vbcl_hlp_generic_probe(void) +{ + /* Generic helper always supposed to return positive status on probe(). This + * helper is a fallback one in case all the other helpers were failed to detect + * their environments. */ + return VINF_SUCCESS; +} + +RTDECL(int) vbcl_hlp_generic_init(void) +{ + ASMAtomicWriteBool(&g_fShutdown, false); + + /* Attempt to start display change events monitor. */ + vbcl_hlp_generic_start_display_change_monitor(); + + /* Always return positive status for generic (fallback, last resort) helper. */ + return VINF_SUCCESS; +} + +RTDECL(int) vbcl_hlp_generic_term(void) +{ + int rc = VINF_SUCCESS; + + if (g_vbclHlpGenericDcmThread != NIL_RTTHREAD) + { + /* Signal thread we are going to shutdown. */ + ASMAtomicWriteBool(&g_fShutdown, true); + + /* Wait for thread to terminate gracefully. */ + rc = RTThreadWait(g_vbclHlpGenericDcmThread, RT_MS_5SEC, NULL); + } + + return rc; +} + +RTDECL(void) vbcl_hlp_generic_subscribe_display_offset_changed(FNDISPLAYOFFSETCHANGE *pfnCb) +{ + g_pfnDisplayOffsetChangeCb = pfnCb; +} + +RTDECL(void) vbcl_hlp_generic_unsubscribe_display_offset_changed(void) +{ + g_pfnDisplayOffsetChangeCb = NULL; +} + +/* Helper callbacks. */ +const VBCLDISPLAYHELPER g_DisplayHelperGeneric = +{ + "GENERIC", /* .pszName */ + vbcl_hlp_generic_probe, /* .pfnProbe */ + vbcl_hlp_generic_init, /* .pfnInit */ + vbcl_hlp_generic_term, /* .pfnTerm */ + vbcl_hlp_generic_set_primary_display, /* .pfnSetPrimaryDisplay */ + vbcl_hlp_generic_subscribe_display_offset_changed, /* .pfnSubscribeDisplayOffsetChangeNotification */ + vbcl_hlp_generic_unsubscribe_display_offset_changed, /* .pfnUnsubscribeDisplayOffsetChangeNotification */ +}; |