1 files changed, 46 insertions, 0 deletions
diff --git a/src/android/app/src/main/java/org/yuzu/yuzu_emu/views/FixedRatioSurfaceView.kt b/src/android/app/src/main/java/org/yuzu/yuzu_emu/views/FixedRatioSurfaceView.kt
new file mode 100644
index 000000000..c8ef8c1fd
--- /dev/null
+++ b/src/android/app/src/main/java/org/yuzu/yuzu_emu/views/FixedRatioSurfaceView.kt
@@ -0,0 +1,46 @@
+// SPDX-FileCopyrightText: 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package org.yuzu.yuzu_emu.views
+
+import android.content.Context
+import android.util.AttributeSet
+import android.util.Rational
+import android.view.SurfaceView
+import kotlin.math.roundToInt
+
+class FixedRatioSurfaceView @JvmOverloads constructor(
+    context: Context,
+    attrs: AttributeSet? = null,
+    defStyleAttr: Int = 0
+) : SurfaceView(context, attrs, defStyleAttr) {
+    private var aspectRatio: Float = 0f // (width / height), 0f is a special value for stretch
+
+    /**
+     * Sets the desired aspect ratio for this view
+     * @param ratio the ratio to force the view to, or null to stretch to fit
+     */
+    fun setAspectRatio(ratio: Rational?) {
+        aspectRatio = ratio?.toFloat() ?: 0f
+    }
+
+    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec)
+        val width = MeasureSpec.getSize(widthMeasureSpec)
+        val height = MeasureSpec.getSize(heightMeasureSpec)
+        if (aspectRatio != 0f) {
+            val newWidth: Int
+            val newHeight: Int
+            if (height * aspectRatio < width) {
+                newWidth = (height * aspectRatio).roundToInt()
+                newHeight = height
+            } else {
+                newWidth = width
+                newHeight = (width / aspectRatio).roundToInt()
+            }
+            setMeasuredDimension(newWidth, newHeight)
+        } else {
+            setMeasuredDimension(width, height)
+        }
+    }
+}