From bcb123a05ef2195d84397b71d12cfc2a4a6b61a9 Mon Sep 17 00:00:00 2001
From: Ilia Demianenko <ilia.demianenko@gmail.com>
Date: Mon, 17 Apr 2023 20:47:53 -0700
Subject: [PATCH] app: [Android] Set high refresh rate on startup

Some devices with high refresh rates limit SurfaceView apps to 60hz
and need a specific API call to set it back. Same approach is used by
https://github.com/ajinasokan/flutter_displaymode. The extra work is
skipped on the devices that don't need it.

Signed-off-by: Ilia Demianenko <ilia.demianenko@gmail.com>
---
 app/GioView.java | 56 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/app/GioView.java b/app/GioView.java
index 80dd0d13..9d223d00 100644
--- a/app/GioView.java
+++ b/app/GioView.java
@@ -26,6 +26,7 @@ import android.text.SpannableStringBuilder;
 import android.util.AttributeSet;
 import android.util.TypedValue;
 import android.view.Choreographer;
+import android.view.Display;
 import android.view.KeyCharacterMap;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
@@ -105,6 +106,8 @@ public final class GioView extends SurfaceView implements Choreographer.FrameCal
 			scrollYScale = px;
 		}
 
+		setHighRefreshRate();
+
 		accessManager = (AccessibilityManager)context.getSystemService(Context.ACCESSIBILITY_SERVICE);
 		imm = (InputMethodManager)context.getSystemService(Context.INPUT_METHOD_SERVICE);
 		nhandle = onCreateView(this);
@@ -255,6 +258,59 @@ public final class GioView extends SurfaceView implements Choreographer.FrameCal
 		this.setBarColor(Bar.NAVIGATION, color, luminance);
 	}
 
+	private void setHighRefreshRate() {
+		Context context = getContext();
+		Display display = context.getDisplay();
+		Display.Mode[] supportedModes = display.getSupportedModes();
+		if (supportedModes.length <= 1) {
+			// Nothing to set
+			return;
+		}
+
+		Display.Mode currentMode = display.getMode();
+		int currentWidth = currentMode.getPhysicalWidth();
+		int currentHeight = currentMode.getPhysicalHeight();
+
+		float minRefreshRate = -1;
+		float maxRefreshRate = -1;
+		float bestRefreshRate = -1;
+		int bestModeId = -1;
+		for (Display.Mode mode : supportedModes) {
+			float refreshRate = mode.getRefreshRate();
+			float width = mode.getPhysicalWidth();
+			float height = mode.getPhysicalHeight();
+
+			if (minRefreshRate == -1 || refreshRate < minRefreshRate) {
+				minRefreshRate = refreshRate;
+			}
+			if (maxRefreshRate == -1 || refreshRate > maxRefreshRate) {
+				maxRefreshRate = refreshRate;
+			}
+
+			boolean refreshRateIsBetter = bestRefreshRate == -1 || refreshRate > bestRefreshRate;
+			if (width == currentWidth && height == currentHeight && refreshRateIsBetter) {
+				int modeId = mode.getModeId();
+				bestRefreshRate = refreshRate;
+				bestModeId = modeId;
+			}
+		}
+
+		if (bestModeId == -1) {
+			// Not expecting this but just in case
+			return;
+		}
+
+		if (minRefreshRate == maxRefreshRate) {
+			// Can't improve the refresh rate
+			return;
+		}
+
+		Window window = ((Activity) context).getWindow();
+		WindowManager.LayoutParams layoutParams = window.getAttributes();
+		layoutParams.preferredDisplayModeId = bestModeId;
+		window.setAttributes(layoutParams);
+	}
+
 	@Override protected boolean dispatchHoverEvent(MotionEvent event) {
 		if (!accessManager.isTouchExplorationEnabled()) {
 			return super.dispatchHoverEvent(event);
-- 
2.45.2