From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 21:33:14 +0200
Subject: Adding upstream version 115.7.0esr.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 gfx/thebes/DisplayConfigWindows.cpp | 92 +++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 gfx/thebes/DisplayConfigWindows.cpp

(limited to 'gfx/thebes/DisplayConfigWindows.cpp')

diff --git a/gfx/thebes/DisplayConfigWindows.cpp b/gfx/thebes/DisplayConfigWindows.cpp
new file mode 100644
index 0000000000..f9696a4070
--- /dev/null
+++ b/gfx/thebes/DisplayConfigWindows.cpp
@@ -0,0 +1,92 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <iostream>
+#include <windows.h>
+
+#include "DisplayConfigWindows.h"
+
+namespace mozilla {
+namespace gfx {
+
+using namespace std;
+
+optional<DisplayConfig> GetDisplayConfig() {
+  LONG result;
+
+  UINT32 numPaths;
+  UINT32 numModes;
+  vector<DISPLAYCONFIG_PATH_INFO> paths;
+  vector<DISPLAYCONFIG_MODE_INFO> modes;
+  do {
+    result = GetDisplayConfigBufferSizes(QDC_ONLY_ACTIVE_PATHS, &numPaths,
+                                         &numModes);
+    if (result != ERROR_SUCCESS) {
+      return {};
+    }
+    // allocate the recommended amount of space
+    paths.resize(numPaths);
+    modes.resize(numModes);
+
+    result = QueryDisplayConfig(QDC_ONLY_ACTIVE_PATHS, &numPaths, paths.data(),
+                                &numModes, modes.data(), NULL);
+    // try again if there wasn't enough space
+  } while (result == ERROR_INSUFFICIENT_BUFFER);
+
+  if (result != ERROR_SUCCESS) return {};
+
+  // shrink to fit the actual number of modes and paths returned
+  modes.resize(numModes);
+  paths.resize(numPaths);
+
+  return DisplayConfig{paths, modes};
+}
+
+bool HasScaledResolution() {
+  auto config = GetDisplayConfig();
+  if (config) {
+    for (auto& path : config->mPaths) {
+      auto& modes = config->mModes;
+      int targetModeIndex = path.targetInfo.modeInfoIdx;
+      int sourceModeIndex = path.sourceInfo.modeInfoIdx;
+
+      // Check if the source and target resolutions are different
+      if ((modes[targetModeIndex]
+               .targetMode.targetVideoSignalInfo.activeSize.cx !=
+           modes[sourceModeIndex].sourceMode.width) ||
+          (modes[targetModeIndex]
+               .targetMode.targetVideoSignalInfo.activeSize.cy !=
+           modes[sourceModeIndex].sourceMode.height)) {
+        return true;
+      }
+    }
+  }
+  return false;
+}
+
+void GetScaledResolutions(ScaledResolutionSet& aRv) {
+  auto config = GetDisplayConfig();
+  if (config) {
+    for (auto& path : config->mPaths) {
+      auto& modes = config->mModes;
+      int targetModeIndex = path.targetInfo.modeInfoIdx;
+      int sourceModeIndex = path.sourceInfo.modeInfoIdx;
+
+      // Check if the source and target resolutions are different
+      IntSize src(modes[sourceModeIndex].sourceMode.width,
+                  modes[sourceModeIndex].sourceMode.height);
+      IntSize dst(
+          modes[targetModeIndex].targetMode.targetVideoSignalInfo.activeSize.cx,
+          modes[targetModeIndex]
+              .targetMode.targetVideoSignalInfo.activeSize.cy);
+      if (src != dst) {
+        aRv.AppendElement(std::pair<IntSize, IntSize>{src, dst});
+      }
+    }
+  }
+}
+
+}  // namespace gfx
+}  // namespace mozilla
-- 
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