From 4e16d65bb8b06c61c029e25984963cc1adfa02ac Mon Sep 17 00:00:00 2001
From: Philip Rebohle <philip.rebohle@tu-dortmund.de>
Date: Wed, 4 Mar 2020 11:15:10 +0100
Subject: [PATCH] [util] Introduce common functions to set, get and restore
 display modes

---
 src/util/util_monitor.cpp | 62 +++++++++++++++++++++++++++++++++++++++
 src/util/util_monitor.h   | 34 +++++++++++++++++++++
 2 files changed, 96 insertions(+)

diff --git a/src/util/util_monitor.cpp b/src/util/util_monitor.cpp
index b7769cf2..28767760 100644
--- a/src/util/util_monitor.cpp
+++ b/src/util/util_monitor.cpp
@@ -1,4 +1,5 @@
 #include "util_monitor.h"
+#include "util_string.h"
 
 #include "./log/log.h"
 
@@ -9,6 +10,67 @@ namespace dxvk {
   }
 
 
+  BOOL SetMonitorDisplayMode(
+          HMONITOR                hMonitor,
+          DEVMODEW*               pMode) {
+    ::MONITORINFOEXW monInfo;
+    monInfo.cbSize = sizeof(monInfo);
+
+    if (!::GetMonitorInfoW(hMonitor, reinterpret_cast<MONITORINFO*>(&monInfo))) {
+      Logger::err("Failed to query monitor info");
+      return E_FAIL;
+    }
+
+    Logger::info(str::format("Setting display mode: ",
+      pMode->dmPelsWidth, "x", pMode->dmPelsHeight, "@",
+      pMode->dmDisplayFrequency));
+
+    LONG status = ::ChangeDisplaySettingsExW(monInfo.szDevice,
+      pMode, nullptr, CDS_FULLSCREEN, nullptr);
+
+    if (status != DISP_CHANGE_SUCCESSFUL) {
+      pMode->dmFields &= ~DM_DISPLAYFREQUENCY;
+
+      status = ::ChangeDisplaySettingsExW(monInfo.szDevice,
+        pMode, nullptr, CDS_FULLSCREEN, nullptr);
+    }
+
+    return status == DISP_CHANGE_SUCCESSFUL;
+  }
+
+
+  BOOL GetMonitorDisplayMode(
+          HMONITOR                hMonitor,
+          DWORD                   modeNum,
+          DEVMODEW*               pMode) {
+    ::MONITORINFOEXW monInfo;
+    monInfo.cbSize = sizeof(monInfo);
+
+    if (!::GetMonitorInfoW(hMonitor, reinterpret_cast<MONITORINFO*>(&monInfo))) {
+      Logger::err("Failed to query monitor info");
+      return false;
+    }
+
+    return ::EnumDisplaySettingsW(monInfo.szDevice, modeNum, pMode);
+  }
+
+
+  BOOL RestoreMonitorDisplayMode(
+          HMONITOR                hMonitor) {
+    DEVMODEW devMode = { };
+    devMode.dmSize = sizeof(devMode);
+
+    if (!GetMonitorDisplayMode(hMonitor, ENUM_REGISTRY_SETTINGS, &devMode))
+      return false;
+
+    Logger::info(str::format("Restoring display mode: ",
+      devMode.dmPelsWidth, "x", devMode.dmPelsHeight, "@",
+      devMode.dmDisplayFrequency));
+
+    return SetMonitorDisplayMode(hMonitor, &devMode);
+  }
+
+
   void GetWindowClientSize(
           HWND                    hWnd,
           UINT*                   pWidth,
diff --git a/src/util/util_monitor.h b/src/util/util_monitor.h
index 81d0a587..c89520a9 100644
--- a/src/util/util_monitor.h
+++ b/src/util/util_monitor.h
@@ -10,6 +10,40 @@ namespace dxvk {
    */
   HMONITOR GetDefaultMonitor();
 
+  /**
+   * \brief Sets monitor display mode
+   *
+   * Note that \c pMode may be altered by this function.
+   * \param [in] hMonitor The monitor to change
+   * \param [in] pMode The desired display mode
+   * \returns \c true on success
+   */
+  BOOL SetMonitorDisplayMode(
+          HMONITOR                hMonitor,
+          DEVMODEW*               pMode);
+
+  /**
+   * \brief Enumerates monitor display modes
+   *
+   * \param [in] hMonitor The monitor to query
+   * \param [in] modeNum Mode number or enum
+   * \param [in] pMode The display mode
+   * \returns \c true on success
+   */
+  BOOL GetMonitorDisplayMode(
+          HMONITOR                hMonitor,
+          DWORD                   modeNum,
+          DEVMODEW*               pMode);
+
+  /**
+   * \brief Change display mode to registry settings
+   *
+   * \param [in] hMonitor The monitor to change
+   * \returns \c true on success
+   */
+  BOOL RestoreMonitorDisplayMode(
+          HMONITOR                hMonitor);
+
   /**
    * \brief Queries window client size
    *