Provide IPdfRenderer from ProcessedImage

NAPS2.Images.Gdi/GdiImageContext.cs

@@ -11,11 +11,7 @@ public class GdiImageContext : ImageContext
 {
     private readonly GdiImageTransformer _imageTransformer;
 
-    public GdiImageContext() : this(null)
-    {
-    }
-
-    public GdiImageContext(IPdfRenderer? pdfRenderer) : base(typeof(GdiImage), pdfRenderer)
+    public GdiImageContext() : base(typeof(GdiImage))
     {
         _imageTransformer = new GdiImageTransformer(this);
     }

NAPS2.Images.Gtk/GtkImageContext.cs

@@ -9,7 +9,7 @@ public class GtkImageContext : ImageContext
     private readonly GtkImageTransformer _imageTransformer;
     private readonly LibTiffIo _tiffIo;
 
-    public GtkImageContext(IPdfRenderer? pdfRenderer = null) : base(typeof(GtkImage), pdfRenderer)
+    public GtkImageContext() : base(typeof(GtkImage))
     {
         _imageTransformer = new GtkImageTransformer(this);
         _tiffIo = new LibTiffIo(this);

NAPS2.Images.ImageSharp/ImageSharpImageContext.cs

@@ -21,7 +21,7 @@ public static Configuration GetConfiguration()
         Configuration = GetConfiguration()
     };
 
-    public ImageSharpImageContext(IPdfRenderer? pdfRenderer = null) : base(typeof(ImageSharpImage), pdfRenderer)
+    public ImageSharpImageContext() : base(typeof(ImageSharpImage))
     {
         _imageTransformer = new ImageSharpImageTransformer(this);
     }

NAPS2.Images.Mac/MacImageContext.cs

@@ -9,7 +9,7 @@ public class MacImageContext : ImageContext
 
     private readonly MacImageTransformer _imageTransformer;
 
-    public MacImageContext(IPdfRenderer? pdfRenderer = null) : base(typeof(MacImage), pdfRenderer)
+    public MacImageContext() : base(typeof(MacImage))
     {
         NSApplication.CheckForIllegalCrossThreadCalls = false;
         _imageTransformer = new MacImageTransformer(this);

NAPS2.Images.Wpf/WpfImageContext.cs

@@ -9,7 +9,7 @@ public class WpfImageContext : ImageContext
 {
     private readonly WpfImageTransformer _imageTransformer;
 
-    public WpfImageContext(IPdfRenderer? pdfRenderer = null) : base(typeof(WpfImage), pdfRenderer)
+    public WpfImageContext() : base(typeof(WpfImage))
     {
         _imageTransformer = new WpfImageTransformer(this);
     }

NAPS2.Images/IMemoryImage.cs

@@ -8,6 +8,8 @@ namespace NAPS2.Images;
 /// </summary>
 public interface IMemoryImage : IImageStorage
 {
+    // TODO: Now that ImageContext objects are fully stateless, we can maybe eliminate ImageContext as a parameter
+    // in IMemoryImage constructors and just create the appropriate ImageContext objects automatically.
     /// <summary>
     /// Gets the image context used to create this image.
     /// </summary>

NAPS2.Images/IPdfRendererProvider.cs

@@ -0,0 +1,6 @@
+namespace NAPS2.Images;
+
+public interface IPdfRendererProvider
+{
+    IPdfRenderer PdfRenderer { get; }
+}

NAPS2.Images/ImageContext.cs

@@ -5,8 +5,6 @@ namespace NAPS2.Images;
 
 public abstract class ImageContext
 {
-    private readonly IPdfRenderer? _pdfRenderer;
-
     public static ImageFileFormat GetFileFormatFromExtension(string path)
     {
         return Path.GetExtension(path).ToLowerInvariant() switch
@@ -43,40 +41,39 @@ private static ImageFileFormat GetFileFormatFromFirstBytes(Stream stream)
         };
     }
 
-    protected ImageContext(Type imageType, IPdfRenderer? pdfRenderer = null)
+    protected ImageContext(Type imageType)
     {
         ImageType = imageType;
-        _pdfRenderer = pdfRenderer;
     }
 
     // TODO: Add NotNullWhen attribute?
-    private bool MaybeRenderPdf(ImageFileStorage fileStorage, out IMemoryImage? renderedPdf)
+    private bool MaybeRenderPdf(ImageFileStorage fileStorage, IPdfRenderer? pdfRenderer, out IMemoryImage? renderedPdf)
     {
         if (Path.GetExtension(fileStorage.FullPath).ToLowerInvariant() == ".pdf")
         {
-            if (_pdfRenderer == null)
+            if (pdfRenderer == null)
             {
                 throw new InvalidOperationException(
-                    "Unable to render pdf page as the ImageContext wasn't created with an IPdfRenderer.");
+                    "Unable to render pdf page as the IRenderableImage didn't implement IPdfRendererProvider.");
             }
-            renderedPdf = _pdfRenderer.Render(this, fileStorage.FullPath, PdfRenderSize.Default).Single();
+            renderedPdf = pdfRenderer.Render(this, fileStorage.FullPath, PdfRenderSize.Default).Single();
             return true;
         }
         renderedPdf = null;
         return false;
     }
 
-    private bool MaybeRenderPdf(ImageMemoryStorage memoryStorage, out IMemoryImage? renderedPdf)
+    private bool MaybeRenderPdf(ImageMemoryStorage memoryStorage, IPdfRenderer? pdfRenderer, out IMemoryImage? renderedPdf)
     {
         if (memoryStorage.TypeHint == ".pdf")
         {
-            if (_pdfRenderer == null)
+            if (pdfRenderer == null)
             {
                 throw new InvalidOperationException(
-                    "Unable to render pdf page as the ImageContext wasn't created with an IPdfRenderer.");
+                    "Unable to render pdf page as the IRenderableImage didn't implement IPdfRendererProvider.");
             }
             var stream = memoryStorage.Stream;
-            renderedPdf = _pdfRenderer.Render(this, stream.GetBuffer(), (int) stream.Length, PdfRenderSize.Default)
+            renderedPdf = pdfRenderer.Render(this, stream.GetBuffer(), (int) stream.Length, PdfRenderSize.Default)
                 .Single();
             return true;
         }
@@ -239,22 +236,27 @@ public void CheckSupportsFormat(ImageFileFormat format)
 
     public IMemoryImage Render(IRenderableImage image)
     {
-        var bitmap = RenderFromStorage(image.Storage);
+        var bitmap = RenderWithoutTransforms(image);
         return PerformAllTransforms(bitmap, image.TransformState.Transforms);
     }
 
-    public IMemoryImage RenderFromStorage(IImageStorage storage)
+    public IMemoryImage RenderWithoutTransforms(IRenderableImage image)
+    {
+        return RenderFromStorage(image.Storage, (image as IPdfRendererProvider)?.PdfRenderer);
+    }
+
+    private IMemoryImage RenderFromStorage(IImageStorage storage, IPdfRenderer pdfRenderer)
     {
         switch (storage)
         {
             case ImageFileStorage fileStorage:
-                if (MaybeRenderPdf(fileStorage, out var renderedPdf))
+                if (MaybeRenderPdf(fileStorage, pdfRenderer, out var renderedPdf))
                 {
                     return renderedPdf!;
                 }
                 return Load(fileStorage.FullPath);
             case ImageMemoryStorage memoryStorage:
-                if (MaybeRenderPdf(memoryStorage, out var renderedMemoryPdf))
+                if (MaybeRenderPdf(memoryStorage, pdfRenderer, out var renderedMemoryPdf))
                 {
                     return renderedMemoryPdf!;
                 }

NAPS2.Sdk.Tests/ContextualTests.cs

@@ -18,7 +18,7 @@ public ContextualTests()
         FolderPath = Path.GetFullPath(Path.Combine("naps2_test_temp", Path.GetRandomFileName()));
         Folder = Directory.CreateDirectory(FolderPath);
 
-        ImageContext = TestImageContextFactory.Get(new PdfiumPdfRenderer());
+        ImageContext = TestImageContextFactory.Get();
         ScanningContext = new ScanningContext(ImageContext);
         ScanningContext.TempFolderPath = Path.Combine(FolderPath, "temp");
         Directory.CreateDirectory(ScanningContext.TempFolderPath);

NAPS2.Sdk.Tests/Images/ImageSerializerTests.cs

@@ -278,7 +278,7 @@ public async Task PdfDeserializeToFileStorage(StorageConfig config)
     public async Task PdfDeserializeToMemoryStorage(StorageConfig config)
     {
         config.Apply(this);
-        using var destContext = new ScanningContext(TestImageContextFactory.Get(new PdfiumPdfRenderer()));
+        using var destContext = new ScanningContext(TestImageContextFactory.Get());
 
         var importPath = Path.Combine(FolderPath, "import.pdf");
         File.WriteAllBytes(importPath, PdfResources.word_generated_pdf);
@@ -340,7 +340,7 @@ public void IncludeThumbnail_InvalidTransformState()
 
     private ScanningContext CreateDestContextWithFileStorage()
     {
-        return new ScanningContext(TestImageContextFactory.Get(new PdfiumPdfRenderer()))
+        return new ScanningContext(TestImageContextFactory.Get())
         {
             FileStorageManager = FileStorageManager.CreateFolder(Path.Combine(FolderPath, "dest"))
         };

NAPS2.Sdk.Tests/TestImageContextFactory.cs

@@ -2,18 +2,18 @@ namespace NAPS2.Sdk.Tests;
 
 public static class TestImageContextFactory
 {
-    public static ImageContext Get(IPdfRenderer pdfRenderer = null)
+    public static ImageContext Get()
     {
         // TODO: For now we use ImageSharp on net6-windows for coverage. But eventually we'll need to do something
         // more comprehensive, i.e. set up some IMAGESHARP/SKIA compiler variables and have special test commands.
 #if MAC
-        return new NAPS2.Images.Mac.MacImageContext(pdfRenderer);
+        return new NAPS2.Images.Mac.MacImageContext();
 #elif LINUX
-        return new NAPS2.Images.Gtk.GtkImageContext(pdfRenderer);
+        return new NAPS2.Images.Gtk.GtkImageContext();
 #elif NET6_0_OR_GREATER
-        return new NAPS2.Images.ImageSharp.ImageSharpImageContext(pdfRenderer);
+        return new NAPS2.Images.ImageSharp.ImageSharpImageContext();
 #else
-        return new NAPS2.Images.Gdi.GdiImageContext(pdfRenderer);
+        return new NAPS2.Images.Gdi.GdiImageContext();
 #endif
     }
 }

NAPS2.Sdk/Images/ProcessedImage.cs

@@ -1,3 +1,5 @@
+using NAPS2.Pdf;
+
 namespace NAPS2.Images;
 
 /// <summary>
@@ -9,7 +11,7 @@ namespace NAPS2.Images;
 /// reference with Clone() that will need to be disposed, and the underlying image storage will only be disposed once
 /// all related instances are disposed (or the parent ScanningContext is disposed).
 /// </summary>
-public class ProcessedImage : IRenderableImage, IDisposable, IEquatable<ProcessedImage>
+public class ProcessedImage : IRenderableImage, IPdfRendererProvider, IDisposable, IEquatable<ProcessedImage>
 {
     private readonly RefCount.Token _token;
     private bool _disposed;
@@ -189,4 +191,6 @@ public void Dispose()
     /// at any moment.
     /// </param>
     public record WeakReference(ProcessedImage ProcessedImage);
+
+    IPdfRenderer IPdfRendererProvider.PdfRenderer => new PdfiumPdfRenderer();
 }

NAPS2.Sdk/Images/ThumbnailRenderer.cs

@@ -17,7 +17,7 @@ public ThumbnailRenderer(ImageContext imageContext)
 
     public IMemoryImage Render(ProcessedImage processedImage, int outputSize)
     {
-        var image = _imageContext.RenderFromStorage(processedImage.Storage);
+        var image = _imageContext.RenderWithoutTransforms(processedImage);
         var transformList = processedImage.TransformState.Transforms;
         if (!processedImage.TransformState.IsEmpty)
         {