Added ImageDpi API

Source/QuestPDF/Drawing/DocumentGenerator.cs

@@ -10,6 +10,7 @@ using QuestPDF.Elements.Text.Items;
 using QuestPDF.Fluent;
 using QuestPDF.Helpers;
 using QuestPDF.Infrastructure;
+using Image = QuestPDF.Elements.Image;
 
 namespace QuestPDF.Drawing
 {
@@ -21,7 +22,7 @@ namespace QuestPDF.Drawing
             
             var metadata = document.GetMetadata();
             var canvas = new PdfCanvas(stream, metadata);
-            RenderDocument(canvas, document);
+            RenderDocument(canvas, document, metadata);
         }
         
         internal static void GenerateXps(Stream stream, IDocument document)
@@ -30,7 +31,7 @@ namespace QuestPDF.Drawing
             
             var metadata = document.GetMetadata();
             var canvas = new XpsCanvas(stream, metadata);
-            RenderDocument(canvas, document);
+            RenderDocument(canvas, document, metadata);
         }
 
         private static void CheckIfStreamIsCompatible(Stream stream)
@@ -46,24 +47,26 @@ namespace QuestPDF.Drawing
         {
             var metadata = document.GetMetadata();
             var canvas = new ImageCanvas(metadata);
-            RenderDocument(canvas, document);
+            RenderDocument(canvas, document, metadata);
 
             return canvas.Images;
         }
 
         internal static ICollection<PreviewerPicture> GeneratePreviewerPictures(IDocument document)
         {
+            var metadata = document.GetMetadata();
             var canvas = new SkiaPictureCanvas();
-            RenderDocument(canvas, document);
+            RenderDocument(canvas, document, metadata);
             return canvas.Pictures;
         }
         
-        internal static void RenderDocument<TCanvas>(TCanvas canvas, IDocument document)
+        internal static void RenderDocument<TCanvas>(TCanvas canvas, IDocument document, DocumentMetadata metadata)
             where TCanvas : ICanvas, IRenderingCanvas
         {
             var container = new DocumentContainer();
             document.Compose(container);
             var content = container.Compose();
+            ApplyDefaultImageDpi(content, metadata.RasterDpi);
             ApplyDefaultTextStyle(content, TextStyle.LibraryDefault);
             ApplyContentDirection(content, ContentDirection.LeftToRight);
             
@@ -173,6 +176,15 @@ namespace QuestPDF.Drawing
 
             return debuggingState;
         }
+
+        internal static void ApplyDefaultImageDpi(this Element? content, int targetDpi)
+        {
+            content.VisitChildren(x =>
+            {
+                if (x is Image { DocumentImage: { } image })
+                    image.TargetDpi ??= targetDpi;
+            });
+        }
         
         internal static void ApplyContentDirection(this Element? content, ContentDirection direction)
         {

Source/QuestPDF/Drawing/DocumentMetadata.cs

@@ -5,8 +5,10 @@ namespace QuestPDF.Drawing
 {
     public class DocumentMetadata
     {
+        public const int DefaultPdfDpi = 72;
+        
         public int ImageQuality { get; set; } = 101;
-        public int RasterDpi { get; set; } = 72;
+        public int RasterDpi { get; set; } = DefaultPdfDpi;
         public bool PdfA { get; set; }
         
         public string? Title { get; set; }

Source/QuestPDF/Infrastructure/Image.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using QuestPDF.Drawing;
 using QuestPDF.Drawing.Exceptions;
 using SkiaSharp;
 
@@ -10,6 +11,8 @@ namespace QuestPDF.Infrastructure
     {
         private SKImage SkImage { get; }
         internal List<(Size size, SKImage image)>? ScaledImageCache { get; }
+        
+        public int? TargetDpi { get; set; }
         internal bool IsDocumentScoped { get; set; }
         
         public int Width => SkImage.Width;
@@ -20,12 +23,6 @@ namespace QuestPDF.Infrastructure
             SkImage = image;
         }
 
-        public Image DisposeAfterDocumentGeneration()
-        {
-            IsDocumentScoped = true;
-            return this;
-        }
-        
         public void Dispose()
         {
             SkImage.Dispose();
@@ -90,5 +87,21 @@ namespace QuestPDF.Infrastructure
         }
 
         #endregion
+        
+        #region configuration API
+        
+        public Image DisposeAfterDocumentGeneration()
+        {
+            IsDocumentScoped = true;
+            return this;
+        }
+
+        public Image WithTargetDpi(int dpi = DocumentMetadata.DefaultPdfDpi)
+        {
+            TargetDpi = dpi;
+            return this;
+        }
+        
+        #endregion
     }
 }