Introduce ScreenshotManager class

osu.Game/Graphics/ScreenshotManager.cs

@@ -0,0 +1,50 @@
+using System;
+using System.Drawing.Imaging;
+using System.IO;
+using osu.Framework.Allocation;
+using osu.Framework.Configuration;
+using osu.Framework.Graphics;
+using osu.Framework.Platform;
+using osu.Game.Configuration;
+
+namespace osu.Game.Graphics
+{
+    public class ScreenshotManager : Drawable
+    {
+        private Bindable<ScreenshotFormat> screenshotFormat;
+        private GameHost host;
+        private Storage storage;
+
+        [BackgroundDependencyLoader]
+        private void load(GameHost host, OsuConfigManager config, Storage storage)
+        {
+            this.host = host;
+            this.storage = storage.GetStorageForDirectory(@"screenshots");
+
+            screenshotFormat = config.GetBindable<ScreenshotFormat>(OsuSetting.ScreenshotFormat);
+        }
+
+        public void TakeScreenshot()
+        {
+            host.TakeScreenshot(screenshotBitmap =>
+            {
+                var stream = storage.GetStream($"{DateTime.Now:yyyyMMddTHHmmss}.{screenshotFormat.ToString().ToLower()}", FileAccess.Write);
+
+                switch (screenshotFormat.Value)
+                {
+                    case ScreenshotFormat.Bmp:
+                        screenshotBitmap.Save(stream, ImageFormat.Bmp);
+                        break;
+                    case ScreenshotFormat.Png:
+                        screenshotBitmap.Save(stream, ImageFormat.Png);
+                        break;
+                    case ScreenshotFormat.Jpg:
+                        screenshotBitmap.Save(stream, ImageFormat.Jpeg);
+                        break;
+                    default:
+                        throw new ArgumentOutOfRangeException(nameof(screenshotFormat));
+                }
+            });
+        }
+    }
+}