Added: Forced Image Resize to JXL Converter

SinjuSigne · Oct 16, 2022 · 948c954 · 948c954
1 parent 3ed9613
commit 948c954
Showing 1 changed file with 27 additions and 4 deletions.
diff --git a/source/Reloaded.Mod.Launcher.Lib/Utility/JxlImageConverter.cs b/source/Reloaded.Mod.Launcher.Lib/Utility/JxlImageConverter.cs
@@ -4,10 +4,13 @@
 namespace Reloaded.Mod.Launcher.Lib.Utility;
 
 /// <summary>
-/// Converts images to JPEG XL format.
+/// Converts images to JPEG XL format, with maximum 1080p resolution.
 /// </summary>
 public class JxlImageConverter : IModPackImageConverter
 {
+    private const int MaxWidth = 1920;
+    private const int MaxHeight = 1080;
+
     /// <summary>
     /// Static instance of the class.
     /// </summary>
@@ -21,15 +24,35 @@ static JxlImageConverter()
     }
 
     /// <inheritdoc />
-    public MemoryStream Convert(Span<byte> source, string extension, out string newExtension)
+    public unsafe MemoryStream Convert(Span<byte> source, string extension, out string newExtension)
     {        
         var settings = new ProcessImageSettings();
         settings.TrySetEncoderFormat(ImageMimeTypes.Jxl);
         settings.EncoderOptions = EncoderOptions;
 
         var output = new MemoryStream();
-        MagicImageProcessor.ProcessImage(source, output, settings);
-
+        fixed (byte* firstByte = &source[0])
+        {
+            // TODO: This is a bit inefficient as some additional work is done to build the initial pipeline, but I can't find an API in ImageScaler just to decode and some sources (\*cough\*) GameBanana force converted to WebP which wouldn't be supported by System.Drawing.Common.
+            var sourceStream = new UnmanagedMemoryStream(firstByte, source.Length);
+            using var pipeline = MagicImageProcessor.BuildPipeline(sourceStream, settings);
+
+            // Scale image to max width/height.
+            var ratioX = (double)MaxWidth / pipeline.PixelSource.Width;
+            var ratioY = (double)MaxHeight / pipeline.PixelSource.Height;
+            var ratio = Math.Min(ratioX, ratioY);
+
+            // Only scale down
+            if (ratio < 1)
+            {
+                settings.Width = (int)(pipeline.PixelSource.Width * ratio);
+                settings.Height = (int)(pipeline.PixelSource.Height * ratio);
+            }
+
+            sourceStream.Position = 0;
+            MagicImageProcessor.ProcessImage(sourceStream, output, settings);
+        }
+
         output.Position = 0;
         newExtension = ".jxl";
         return output;