Improve performance of looking up static system properties

2026-02-16 10:40:59 +00:00 · 2019-03-23 12:05:08 -07:00
parent c313f1a20b
commit 2703efedef
9 changed files with 164 additions and 161 deletions
--- a/app/backend/systemproperties.cpp
+++ b/app/backend/systemproperties.cpp
@@ -0,0 +1,101 @@
+#include "systemproperties.h"
+
+#include "streaming/session.h"
+#include "streaming/streamutils.h"
+
+SystemProperties::SystemProperties()
+{
+    hasHardwareAcceleration =
+            Session::isHardwareDecodeAvailable(StreamingPreferences::VDS_AUTO,
+                                               VIDEO_FORMAT_H264,
+                                               1920, 1080, 60);
+
+    isRunningWayland = qgetenv("XDG_SESSION_TYPE") == "wayland";
+
+#ifdef Q_OS_WIN32
+    isWow64 = QSysInfo::currentCpuArchitecture() != QSysInfo::buildCpuArchitecture();
+#else
+    isWow64 = false;
+#endif
+
+#ifndef STEAM_LINK
+    hasBrowser = true;
+#else
+    hasBrowser = false;
+#endif
+
+    unmappedGamepads = SdlInputHandler::getUnmappedGamepads();
+
+    // Populate data that requires talking to SDL. We do it all in one shot
+    // and cache the results to speed up future queries on this data.
+    querySdlVideoInfo();
+
+    Q_ASSERT(maximumStreamingFrameRate >= 60);
+    Q_ASSERT(!monitorDesktopResolutions.isEmpty());
+    Q_ASSERT(!monitorNativeResolutions.isEmpty());
+}
+
+QRect SystemProperties::getDesktopResolution(int displayIndex)
+{
+    // Returns default constructed QRect if out of bounds
+    return monitorDesktopResolutions.value(displayIndex);
+}
+
+QRect SystemProperties::getNativeResolution(int displayIndex)
+{
+    // Returns default constructed QRect if out of bounds
+    return monitorNativeResolutions.value(displayIndex);
+}
+
+void SystemProperties::querySdlVideoInfo()
+{
+    monitorDesktopResolutions.clear();
+    monitorNativeResolutions.clear();
+
+    // Never let the maximum drop below 60 FPS
+    maximumStreamingFrameRate = 60;
+
+    if (SDL_InitSubSystem(SDL_INIT_VIDEO) != 0) {
+        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
+                     "SDL_InitSubSystem(SDL_INIT_VIDEO) failed: %s",
+                     SDL_GetError());
+        return;
+    }
+
+    SDL_DisplayMode bestMode;
+    for (int displayIndex = 0; displayIndex < SDL_GetNumVideoDisplays(); displayIndex++) {
+        SDL_DisplayMode desktopMode;
+        int err;
+
+        err = SDL_GetDesktopDisplayMode(displayIndex, &desktopMode);
+        if (err == 0) {
+            monitorDesktopResolutions.insert(displayIndex, QRect(0, 0, desktopMode.w, desktopMode.h));
+        }
+        else {
+            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,
+                         "SDL_GetDesktopDisplayMode() failed: %s",
+                         SDL_GetError());
+        }
+
+        if (StreamUtils::getRealDesktopMode(displayIndex, &desktopMode)) {
+            monitorNativeResolutions.insert(displayIndex, QRect(0, 0, desktopMode.w, desktopMode.h));
+
+            // Start at desktop mode and work our way up
+            bestMode = desktopMode;
+            for (int i = 0; i < SDL_GetNumDisplayModes(displayIndex); i++) {
+                SDL_DisplayMode mode;
+                if (SDL_GetDisplayMode(displayIndex, i, &mode) == 0) {
+                    if (mode.w == desktopMode.w && mode.h == desktopMode.h) {
+                        if (mode.refresh_rate > bestMode.refresh_rate) {
+                            bestMode = mode;
+                        }
+                    }
+                }
+            }
+
+            maximumStreamingFrameRate = qMax(maximumStreamingFrameRate, bestMode.refresh_rate);
+        }
+    }
+
+    SDL_QuitSubSystem(SDL_INIT_VIDEO);
+}