[93370] | 1 | /* $Id: display-helper-generic.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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[93423] | 3 | * Guest Additions - Generic Desktop Environment helper.
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| 4 | *
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[93370] | 5 | * A generic helper for X11 Client which performs Desktop Environment
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[93423] | 6 | * specific actions utilizing libXrandr.
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[93370] | 7 | */
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| 8 |
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| 9 | /*
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[98103] | 10 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
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[93370] | 11 | *
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[96407] | 12 | * This file is part of VirtualBox base platform packages, as
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| 13 | * available from https://www.virtualbox.org.
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| 14 | *
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| 15 | * This program is free software; you can redistribute it and/or
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| 16 | * modify it under the terms of the GNU General Public License
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| 17 | * as published by the Free Software Foundation, in version 3 of the
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| 18 | * License.
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| 19 | *
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| 20 | * This program is distributed in the hope that it will be useful, but
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| 21 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 23 | * General Public License for more details.
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| 24 | *
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| 25 | * You should have received a copy of the GNU General Public License
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| 26 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 27 | *
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| 28 | * SPDX-License-Identifier: GPL-3.0-only
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[93370] | 29 | */
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| 30 |
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| 31 | #include "VBoxClient.h"
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| 32 | #include "display-helper.h"
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| 33 |
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| 34 | #include <stdio.h>
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| 35 | #include <stdlib.h>
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| 36 |
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| 37 | #include <VBox/log.h>
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| 38 | #include <VBox/xrandr.h>
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| 39 |
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[93375] | 40 | #include <iprt/errcore.h>
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[93370] | 41 | #include <iprt/asm.h>
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| 42 | #include <iprt/thread.h>
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| 43 | #include <iprt/mem.h>
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| 44 | #include <iprt/list.h>
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| 45 |
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[93379] | 46 | /** Load libxrandr symbols needed for us. */
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[93370] | 47 | #include <VBox/xrandr.h>
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| 48 | /* Declarations of the functions that we need from libXrandr. */
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| 49 | #define VBOX_XRANDR_GENERATE_BODY
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| 50 | #include <VBox/xrandr-calls.h>
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| 51 |
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| 52 | #include <X11/Xlibint.h>
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| 53 |
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| 54 | /** Name of Display Change Monitor thread. */
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| 55 | #define VBCL_HLP_DCM_THREAD_NAME "dcm-task"
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| 56 |
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| 57 | /** Display Change Monitor thread. */
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[93400] | 58 | static RTTHREAD g_vbclHlpGenericDcmThread = NIL_RTTHREAD;
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[93370] | 59 |
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| 60 | /** Global flag which is triggered when service requested to shutdown. */
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| 61 | static bool volatile g_fShutdown;
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| 62 |
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| 63 | /** Node of monitors info list. */
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| 64 | typedef struct vbcl_hlp_generic_monitor_list_t
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| 65 | {
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| 66 | /** List node. */
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| 67 | RTLISTNODE Node;
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| 68 | /** Pointer to xRandr monitor info. */
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| 69 | XRRMonitorInfo *pMonitorInfo;
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| 70 | } vbcl_hlp_generic_monitor_list_t;
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| 71 |
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| 72 | /** Pointer to display change event notification callback (set by external function call). */
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| 73 | static FNDISPLAYOFFSETCHANGE *g_pfnDisplayOffsetChangeCb;
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| 74 |
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| 75 | /**
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| 76 | * Determine monitor name strings order in a list of monitors which is sorted in ascending way.
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| 77 | *
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| 78 | * @return TRUE if first name should go first in a list, FALSE otherwise.
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| 79 | * @param pszName1 First monitor name.
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[93380] | 80 | * @param pszName2 Second monitor name.
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[93370] | 81 | */
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| 82 | static bool vbcl_hlp_generic_order_names(char *pszName1, char *pszName2)
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| 83 | {
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| 84 | AssertReturn(pszName1, false);
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| 85 | AssertReturn(pszName2, false);
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| 86 |
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| 87 | char *pszFirst = pszName1;
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| 88 | char *pszSecond = pszName2;
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| 89 |
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| 90 | while (*pszFirst && *pszSecond)
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| 91 | {
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| 92 | if (*pszFirst < *pszSecond)
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| 93 | return true;
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| 94 |
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| 95 | pszFirst++;
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| 96 | pszSecond++;
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| 97 | }
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| 98 |
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| 99 | return false;
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| 100 | }
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| 101 |
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| 102 | /**
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| 103 | * Insert monitor info into the list sorted ascending.
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| 104 | *
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| 105 | * @return IPRT status code.
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| 106 | * @param pDisplay X11 display handle to fetch monitor name string from.
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| 107 | * @param pListHead Head of monitors info list.
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| 108 | * @param pMonitorInfo Monitor info ti be inserted into the list.
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| 109 | */
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| 110 | static int vbcl_hlp_generic_monitor_list_insert_sorted(
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| 111 | Display *pDisplay, vbcl_hlp_generic_monitor_list_t *pListHead, XRRMonitorInfo *pMonitorInfo)
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| 112 | {
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| 113 | vbcl_hlp_generic_monitor_list_t *pNode = (vbcl_hlp_generic_monitor_list_t *)RTMemAllocZ(sizeof(vbcl_hlp_generic_monitor_list_t));
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| 114 | vbcl_hlp_generic_monitor_list_t *pNodeIter;
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| 115 | char *pszMonitorName;
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| 116 |
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| 117 | AssertReturn(pNode, VERR_NO_MEMORY);
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| 118 |
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| 119 | pNode->pMonitorInfo = pMonitorInfo;
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| 120 |
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| 121 | if (RTListIsEmpty(&pListHead->Node))
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| 122 | {
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| 123 | RTListNodeInsertAfter(&pListHead->Node, &pNode->Node);
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| 124 | return VINF_SUCCESS;
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| 125 | }
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| 126 |
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| 127 | pszMonitorName = XGetAtomName(pDisplay, pMonitorInfo->name);
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| 128 | AssertReturn(pszMonitorName, VERR_NO_MEMORY);
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| 129 |
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| 130 | RTListForEach(&pListHead->Node, pNodeIter, vbcl_hlp_generic_monitor_list_t, Node)
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| 131 | {
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| 132 | char *pszIterMonitorName = XGetAtomName(pDisplay, pNodeIter->pMonitorInfo->name);
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| 133 |
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| 134 | if (vbcl_hlp_generic_order_names(pszMonitorName, pszIterMonitorName))
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| 135 | {
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| 136 | RTListNodeInsertBefore(&pNodeIter->Node, &pNode->Node);
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| 137 | XFree((void *)pszIterMonitorName);
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| 138 | XFree((void *)pszMonitorName);
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| 139 | return VINF_SUCCESS;
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| 140 | }
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| 141 |
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| 142 | XFree((void *)pszIterMonitorName);
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| 143 | }
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| 144 |
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| 145 | XFree((void *)pszMonitorName);
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| 146 |
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| 147 | /* If we reached the end of the list, it means that monitor
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| 148 | * should be placed in the end (according to alphabetical sorting). */
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| 149 | RTListNodeInsertBefore(&pNodeIter->Node, &pNode->Node);
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| 150 |
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| 151 | return VINF_SUCCESS;
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| 152 | }
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| 153 |
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| 154 | /**
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| 155 | * Release monitors info list resources.
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| 156 | *
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| 157 | * @param pListHead List head.
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| 158 | */
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| 159 | static void vbcl_hlp_generic_free_monitor_list(vbcl_hlp_generic_monitor_list_t *pListHead)
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| 160 | {
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| 161 | vbcl_hlp_generic_monitor_list_t *pEntry, *pNextEntry;
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| 162 |
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| 163 | RTListForEachSafe(&pListHead->Node, pEntry, pNextEntry, vbcl_hlp_generic_monitor_list_t, Node)
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| 164 | {
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| 165 | RTListNodeRemove(&pEntry->Node);
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| 166 | RTMemFree(pEntry);
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| 167 | }
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| 168 | }
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| 169 |
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| 170 | /**
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| 171 | * Handle received RRScreenChangeNotify event.
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| 172 | *
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| 173 | * @param pDisplay X11 display handle.
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| 174 | */
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| 175 | static void vbcl_hlp_generic_process_display_change_event(Display *pDisplay)
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| 176 | {
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[93400] | 177 | int iCount;
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| 178 | uint32_t idxDisplay = 0;
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[93370] | 179 | XRRMonitorInfo *pMonitorsInfo = XRRGetMonitors(pDisplay, DefaultRootWindow(pDisplay), true, &iCount);
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[93400] | 180 | if (pMonitorsInfo && iCount > 0 && iCount < VBOX_DRMIPC_MONITORS_MAX)
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[93370] | 181 | {
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| 182 | int rc;
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| 183 | vbcl_hlp_generic_monitor_list_t pMonitorsInfoList, *pIter;
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[94076] | 184 | struct VBOX_DRMIPC_VMWRECT aDisplays[VBOX_DRMIPC_MONITORS_MAX];
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[93370] | 185 |
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| 186 | RTListInit(&pMonitorsInfoList.Node);
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| 187 |
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| 188 | /* Put monitors info into sorted (by monitor name) list. */
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| 189 | for (int i = 0; i < iCount; i++)
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| 190 | {
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| 191 | rc = vbcl_hlp_generic_monitor_list_insert_sorted(pDisplay, &pMonitorsInfoList, &pMonitorsInfo[i]);
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| 192 | if (RT_FAILURE(rc))
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| 193 | {
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[93400] | 194 | VBClLogError("unable to fill monitors info list, rc=%Rrc\n", rc);
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[93370] | 195 | break;
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| 196 | }
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| 197 | }
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| 198 |
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| 199 | /* Now iterate over sorted list of monitor configurations. */
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| 200 | RTListForEach(&pMonitorsInfoList.Node, pIter, vbcl_hlp_generic_monitor_list_t, Node)
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| 201 | {
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| 202 | char *pszMonitorName = XGetAtomName(pDisplay, pIter->pMonitorInfo->name);
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| 203 |
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[93400] | 204 | VBClLogVerbose(1, "reporting monitor %s offset: (%d, %d)\n",
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[93370] | 205 | pszMonitorName, pIter->pMonitorInfo->x, pIter->pMonitorInfo->y);
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| 206 |
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| 207 | XFree((void *)pszMonitorName);
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| 208 |
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[94076] | 209 | aDisplays[idxDisplay].x = pIter->pMonitorInfo->x;
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| 210 | aDisplays[idxDisplay].y = pIter->pMonitorInfo->y;
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| 211 | aDisplays[idxDisplay].w = pIter->pMonitorInfo->width;
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| 212 | aDisplays[idxDisplay].h = pIter->pMonitorInfo->height;
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| 213 |
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[93370] | 214 | idxDisplay++;
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| 215 | }
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| 216 |
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| 217 | vbcl_hlp_generic_free_monitor_list(&pMonitorsInfoList);
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| 218 |
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| 219 | XRRFreeMonitors(pMonitorsInfo);
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| 220 |
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| 221 | if (g_pfnDisplayOffsetChangeCb)
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| 222 | {
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[94076] | 223 | rc = g_pfnDisplayOffsetChangeCb(idxDisplay, aDisplays);
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[93370] | 224 | if (RT_FAILURE(rc))
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[93400] | 225 | VBClLogError("unable to notify subscriber about monitors info change, rc=%Rrc\n", rc);
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[93370] | 226 | }
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| 227 | }
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| 228 | else
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[93400] | 229 | VBClLogError("cannot get monitors info\n");
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[93370] | 230 | }
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| 231 |
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| 232 | /** Worker thread for display change events monitoring. */
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| 233 | static DECLCALLBACK(int) vbcl_hlp_generic_display_change_event_monitor_worker(RTTHREAD ThreadSelf, void *pvUser)
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| 234 | {
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| 235 | int rc = VERR_GENERAL_FAILURE;
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| 236 |
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| 237 | RT_NOREF(pvUser);
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| 238 |
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| 239 | VBClLogVerbose(1, "vbcl_hlp_generic_display_change_event_monitor_worker started\n");
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| 240 |
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| 241 | Display *pDisplay = XOpenDisplay(NULL);
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| 242 | if (pDisplay)
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| 243 | {
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| 244 | bool fSuccess;
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| 245 | int iEventBase, iErrorBase /* unused */, iMajor, iMinor;
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| 246 |
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| 247 | fSuccess = XRRQueryExtension(pDisplay, &iEventBase, &iErrorBase);
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| 248 | fSuccess &= XRRQueryVersion(pDisplay, &iMajor, &iMinor);
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| 249 |
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| 250 | if (fSuccess && iMajor >= 1 && iMinor > 3)
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| 251 | {
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| 252 | /* All required checks are now passed. Notify parent thread that we started. */
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| 253 | RTThreadUserSignal(ThreadSelf);
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| 254 |
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| 255 | /* Only receive events we need. */
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| 256 | XRRSelectInput(pDisplay, DefaultRootWindow(pDisplay), RRScreenChangeNotifyMask);
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| 257 |
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| 258 | /* Monitor main loop. */
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| 259 | while (!ASMAtomicReadBool(&g_fShutdown))
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| 260 | {
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| 261 | XEvent Event;
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| 262 |
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| 263 | if (XPending(pDisplay) > 0)
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| 264 | {
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| 265 | XNextEvent(pDisplay, &Event);
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| 266 | switch (Event.type - iEventBase)
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| 267 | {
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| 268 | case RRScreenChangeNotify:
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| 269 | {
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| 270 | vbcl_hlp_generic_process_display_change_event(pDisplay);
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| 271 | break;
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| 272 | }
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| 273 |
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| 274 | default:
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| 275 | break;
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| 276 | }
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| 277 | }
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| 278 | else
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| 279 | RTThreadSleep(RT_MS_1SEC / 2);
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| 280 | }
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| 281 | }
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| 282 | else
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| 283 | {
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[93400] | 284 | VBClLogError("dcm monitor cannot find XRandr 1.3+ extension\n");
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[93370] | 285 | rc = VERR_NOT_AVAILABLE;
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| 286 | }
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| 287 |
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| 288 | XCloseDisplay(pDisplay);
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| 289 | }
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| 290 | else
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| 291 | {
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[93400] | 292 | VBClLogError("dcm monitor cannot open X Display\n");
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[93370] | 293 | rc = VERR_NOT_AVAILABLE;
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| 294 | }
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| 295 |
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| 296 | VBClLogVerbose(1, "vbcl_hlp_generic_display_change_event_monitor_worker ended\n");
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| 297 |
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| 298 | return rc;
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| 299 | }
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| 300 |
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[93400] | 301 | static void vbcl_hlp_generic_start_display_change_monitor()
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[93370] | 302 | {
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| 303 | int rc;
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| 304 |
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| 305 | rc = RTXrandrLoadLib();
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| 306 | if (RT_SUCCESS(rc))
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| 307 | {
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| 308 | /* Start thread which will monitor display change events. */
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[93400] | 309 | rc = RTThreadCreate(&g_vbclHlpGenericDcmThread, vbcl_hlp_generic_display_change_event_monitor_worker, (void *)NULL, 0,
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[93370] | 310 | RTTHREADTYPE_DEFAULT, RTTHREADFLAGS_WAITABLE, VBCL_HLP_DCM_THREAD_NAME);
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| 311 | if (RT_SUCCESS(rc))
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| 312 | {
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[93400] | 313 | rc = RTThreadUserWait(g_vbclHlpGenericDcmThread, RT_MS_5SEC);
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[93370] | 314 | }
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| 315 | else
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[93400] | 316 | g_vbclHlpGenericDcmThread = NIL_RTTHREAD;
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[93370] | 317 |
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[93400] | 318 | VBClLogInfo("attempt to start display change monitor thread, rc=%Rrc\n", rc);
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[93370] | 319 |
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| 320 | }
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| 321 | else
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[93400] | 322 | VBClLogInfo("libXrandr not available, will not monitor display change events, rc=%Rrc\n", rc);
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[93370] | 323 | }
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| 324 |
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| 325 | /**
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| 326 | * @interface_method_impl{VBCLDISPLAYHELPER,pfnSetPrimaryDisplay}
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| 327 | */
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[93378] | 328 | static DECLCALLBACK(int) vbcl_hlp_generic_set_primary_display(uint32_t idDisplay)
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[93370] | 329 | {
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| 330 | XRRScreenResources *pScreenResources;
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| 331 | Display *pDisplay;
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| 332 |
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| 333 | int rc = VERR_INVALID_PARAMETER;
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| 334 |
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| 335 | pDisplay = XOpenDisplay(NULL);
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| 336 | if (pDisplay)
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| 337 | {
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| 338 | pScreenResources = XRRGetScreenResources(pDisplay, DefaultRootWindow(pDisplay));
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| 339 | if (pScreenResources)
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| 340 | {
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| 341 | if ((int)idDisplay < pScreenResources->noutput)
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| 342 | {
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| 343 | XRRSetOutputPrimary(pDisplay, DefaultRootWindow(pDisplay), pScreenResources->outputs[idDisplay]);
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[93400] | 344 | VBClLogInfo("display %u has been set as primary\n", idDisplay);
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[93370] | 345 | rc = VINF_SUCCESS;
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| 346 | }
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| 347 | else
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[93400] | 348 | VBClLogError("cannot set display %u as primary: index out of range\n", idDisplay);
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[93370] | 349 |
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| 350 | XRRFreeScreenResources(pScreenResources);
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| 351 | }
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| 352 | else
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[93400] | 353 | VBClLogError("cannot set display %u as primary: libXrandr can not get screen resources\n", idDisplay);
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[93370] | 354 |
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| 355 | XCloseDisplay(pDisplay);
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| 356 | }
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| 357 | else
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[93400] | 358 | VBClLogError("cannot set display %u as primary: cannot connect to X11\n", idDisplay);
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[93370] | 359 |
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| 360 | return rc;
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| 361 | }
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| 362 |
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| 363 | /**
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| 364 | * @interface_method_impl{VBCLDISPLAYHELPER,pfnProbe}
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| 365 | */
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[93378] | 366 | static DECLCALLBACK(int) vbcl_hlp_generic_probe(void)
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[93370] | 367 | {
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| 368 | /* Generic helper always supposed to return positive status on probe(). This
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| 369 | * helper is a fallback one in case all the other helpers were failed to detect
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| 370 | * their environments. */
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| 371 | return VINF_SUCCESS;
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| 372 | }
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| 373 |
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| 374 | RTDECL(int) vbcl_hlp_generic_init(void)
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| 375 | {
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| 376 | ASMAtomicWriteBool(&g_fShutdown, false);
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| 377 |
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[93400] | 378 | /* Attempt to start display change events monitor. */
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| 379 | vbcl_hlp_generic_start_display_change_monitor();
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[93370] | 380 |
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| 381 | /* Always return positive status for generic (fallback, last resort) helper. */
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| 382 | return VINF_SUCCESS;
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| 383 | }
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| 384 |
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| 385 | RTDECL(int) vbcl_hlp_generic_term(void)
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| 386 | {
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| 387 | int rc = VINF_SUCCESS;
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| 388 |
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[93400] | 389 | if (g_vbclHlpGenericDcmThread != NIL_RTTHREAD)
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[93370] | 390 | {
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| 391 | /* Signal thread we are going to shutdown. */
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| 392 | ASMAtomicWriteBool(&g_fShutdown, true);
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| 393 |
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| 394 | /* Wait for thread to terminate gracefully. */
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[93400] | 395 | rc = RTThreadWait(g_vbclHlpGenericDcmThread, RT_MS_5SEC, NULL);
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[93370] | 396 | }
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| 397 |
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| 398 | return rc;
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| 399 | }
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| 400 |
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| 401 | RTDECL(void) vbcl_hlp_generic_subscribe_display_offset_changed(FNDISPLAYOFFSETCHANGE *pfnCb)
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| 402 | {
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| 403 | g_pfnDisplayOffsetChangeCb = pfnCb;
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| 404 | }
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| 405 |
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| 406 | RTDECL(void) vbcl_hlp_generic_unsubscribe_display_offset_changed(void)
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| 407 | {
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| 408 | g_pfnDisplayOffsetChangeCb = NULL;
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| 409 | }
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| 410 |
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| 411 | /* Helper callbacks. */
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| 412 | const VBCLDISPLAYHELPER g_DisplayHelperGeneric =
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| 413 | {
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| 414 | "GENERIC", /* .pszName */
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| 415 | vbcl_hlp_generic_probe, /* .pfnProbe */
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| 416 | vbcl_hlp_generic_init, /* .pfnInit */
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| 417 | vbcl_hlp_generic_term, /* .pfnTerm */
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| 418 | vbcl_hlp_generic_set_primary_display, /* .pfnSetPrimaryDisplay */
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| 419 | vbcl_hlp_generic_subscribe_display_offset_changed, /* .pfnSubscribeDisplayOffsetChangeNotification */
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| 420 | vbcl_hlp_generic_unsubscribe_display_offset_changed, /* .pfnUnsubscribeDisplayOffsetChangeNotification */
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| 421 | };
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