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