Added more examples for the Shrink element

2022.9 Release

QuestPDF.Examples/GenerationBenchmark.cs

@@ -0,0 +1,146 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using NUnit.Framework;
+using QuestPDF.Elements;
+using QuestPDF.Fluent;
+using QuestPDF.Helpers;
+
+namespace QuestPDF.Examples
+{
+    public class ProcessRunningTime
+    {
+        public TimeSpan FluentTime { get; set; }
+        public TimeSpan GenerationTime { get; set; }
+        public float Size { get; set; }
+    }
+    
+    public class GenerationBenchmark
+    {
+        public const int TestSize = 4096;
+        
+        [Test]
+        public void BenchmarkAsync()
+        {
+            RunTest(() => Enumerable
+                .Range(0, TestSize)
+                .AsParallel() // difference
+                .Select(GenerateAndCollect)
+                .ToList());
+        }
+        
+        [Test]
+        public void BenchmarkSync()
+        {
+            RunTest(() => Enumerable
+                .Range(0, TestSize)
+                .Select(GenerateAndCollect)
+                .ToList());
+        }
+
+        public void RunTest(Func<IEnumerable<ProcessRunningTime>> handler)
+        {
+            var totalFluentTime = TimeSpan.Zero;
+            var totalGenerationTime = TimeSpan.Zero;
+
+            var stopWatch = new Stopwatch();
+            
+            stopWatch.Start();
+            var results = handler();
+            stopWatch.Stop();
+            
+            foreach (var result in results)
+            {
+                totalFluentTime += result.FluentTime;
+                totalGenerationTime += result.GenerationTime;
+            }
+
+            Console.WriteLine($"Fluent: {totalFluentTime:g}");
+            Console.WriteLine($"Generation: {totalGenerationTime:g}");
+            Console.WriteLine($"Total: {stopWatch.Elapsed:g}");
+        }
+        
+        static ProcessRunningTime GenerateAndCollect(int attemptNumber)
+        {
+            var stopwatch = new Stopwatch();
+            stopwatch.Start();
+            
+            var container = new Container();
+            
+            container
+                .Padding(10)
+                .MinimalBox()
+                .Border(1)
+                .Column(column =>
+                {
+                    column.Item().Text($"Attempts {attemptNumber}");
+                    
+                    const int numberOfRows = 100;
+                    const int numberOfColumns = 10;
+
+                    for (var y = 0; y < numberOfRows; y++)
+                    {
+                        column.Item().Row(row =>
+                        {
+                            for (var x = 0; x < numberOfColumns; x++)
+                            {
+                                row.RelativeItem()
+                                    
+                                    .Background(Colors.Red.Lighten5)
+                                    .Padding(3)
+                                    
+                                    .Background(Colors.Red.Lighten4)
+                                    .Padding(3)
+                                    
+                                    .Background(Colors.Red.Lighten3)
+                                    .Padding(3)
+                                    
+                                    .Background(Colors.Red.Lighten2)
+                                    .Padding(3)
+                                    
+                                    .Background(Colors.Red.Lighten1)
+                                    .Padding(3)
+                                    
+                                    .Background(Colors.Red.Medium)
+                                    .Padding(3)
+                                    
+                                    .Background(Colors.Red.Darken1)
+                                    .Padding(3)
+                                    
+                                    .Background(Colors.Red.Darken2)
+                                    .Padding(3)
+                                    
+                                    .Background(Colors.Red.Darken3)
+                                    .Padding(3)
+                                    
+                                    .Background(Colors.Red.Darken4)
+                                    .Height(3);
+                            }
+                        });
+                    }  
+                });
+
+            var fluentTime = stopwatch.Elapsed;
+            
+            stopwatch.Reset();
+            stopwatch.Start();
+
+            var size = Document
+                .Create(x => x.Page(page => page.Content().Element(container)))
+                .GeneratePdf()
+                .Length;
+
+            var generationTime = stopwatch.Elapsed;
+            
+            return new ProcessRunningTime
+            {
+                FluentTime = fluentTime,
+                GenerationTime = generationTime,
+                Size = size
+            };
+        }
+    }
+}

QuestPDF.Examples/RelativePaddingExamples.cs

@@ -0,0 +1,36 @@
+using NUnit.Framework;
+using QuestPDF.Examples.Engine;
+using QuestPDF.Fluent;
+using QuestPDF.Helpers;
+
+namespace QuestPDF.Examples
+{
+    public class RelativePaddingExamples
+    {
+        [Test]
+        public void ItemTypes()
+        {
+            RenderingTest
+                .Create()
+                .ProduceImages()
+                .PageSize(250, 250)
+                .ShowResults()
+                .Render(container =>
+                {
+                    container
+                        .Width(250)
+                        .Height(250)
+                            
+                        .Padding(50)
+                        .Background(Colors.Grey.Lighten2)
+                        
+                        .RelativePaddingLeft(0.1f)
+                        .RelativePaddingTop(0.2f)
+                        .RelativePaddingRight(0.3f)
+                        .RelativePaddingBottom(0.4f)
+                        
+                        .Background(Colors.Grey.Darken2);
+                });
+        }
+    }
+}

QuestPDF.Examples/RelativePositionExamples.cs

@@ -0,0 +1,32 @@
+using System.Linq;
+using NUnit.Framework;
+using QuestPDF.Examples.Engine;
+using QuestPDF.Fluent;
+using QuestPDF.Helpers;
+
+namespace QuestPDF.Examples
+{
+    public class RelativePositionExamples
+    {
+        [Test]
+        public void ItemTypes()
+        {
+            RenderingTest
+                .Create()
+                .ProduceImages()
+                .PageSize(500, 500)
+                .ShowResults()
+                .Render(container =>
+                {
+                    container
+                        .Padding(100)
+                        .Background(Colors.Grey.Lighten2)
+                        .RelativePositionVertical(0.5f, -0.5f)
+                        .RelativePositionHorizontal(1f, -0.5f)
+                        .RelativeWidth(0.4f)
+                        .RelativeHeight(0.6f)
+                        .Background(Colors.Grey.Darken2);
+                });
+        }
+    }
+}

QuestPDF.Examples/RelativeSizeExamples.cs

@@ -0,0 +1,38 @@
+using System.Linq;
+using NUnit.Framework;
+using QuestPDF.Examples.Engine;
+using QuestPDF.Fluent;
+using QuestPDF.Helpers;
+
+namespace QuestPDF.Examples
+{
+    public class RelativeSizeExamples
+    {
+        [Test]
+        public void ItemTypes()
+        {
+            RenderingTest
+                .Create()
+                .ProduceImages()
+                .PageSize(600, 600)
+                .ShowResults()
+                .Render(container =>
+                {
+                    container
+                        .AlignMiddle()
+                        .AlignCenter()
+                        .Width(400)
+                        .Height(400)
+                        .Background(Colors.Grey.Lighten2)
+                        .AlignMiddle()
+                        .AlignCenter()
+                        .Container()
+                        .AlignMiddle()
+                        .AlignCenter()
+                        .RelativeWidth(0.25f)
+                        .RelativeHeight(0.5f)
+                        .Background(Colors.Grey.Darken2);
+                });
+        }
+    }
+}

QuestPDF.Examples/ShrinkExamples.cs

@@ -0,0 +1,93 @@
+using NUnit.Framework;
+using QuestPDF.Examples.Engine;
+using QuestPDF.Fluent;
+using QuestPDF.Helpers;
+
+namespace QuestPDF.Examples
+{
+    public class ShrinkExamples
+    {
+        [Test]
+        public void Shrink_Without()
+        {
+            RenderingTest
+                .Create()
+                .PageSize(300, 200)
+                .ProduceImages()
+                .ShowResults()
+                .Render(container =>
+                {
+                    container
+                        .Padding(20)
+                        .Border(2)
+                        .Background(Colors.Grey.Lighten2)
+                        .Padding(20)
+                        .Text("This is test.")
+                        .FontSize(20);
+                });
+        }
+        
+        [Test]
+        public void Shrink_Horizontal()
+        {
+            RenderingTest
+                .Create()
+                .PageSize(300, 200)
+                .ProduceImages()
+                .ShowResults()
+                .Render(container =>
+                {
+                    container
+                        .Padding(20)
+                        .Border(2)
+                        .ShrinkHorizontal()
+                        .Background(Colors.Grey.Lighten2)
+                        .Padding(20)
+                        .Text("This is test.")
+                        .FontSize(20);
+                });
+        }
+        
+        [Test]
+        public void Shrink_Vertical()
+        {
+            RenderingTest
+                .Create()
+                .PageSize(300, 200)
+                .ProduceImages()
+                .ShowResults()
+                .Render(container =>
+                {
+                    container
+                        .Padding(20)
+                        .Border(2)
+                        .ShrinkVertical()
+                        .Background(Colors.Grey.Lighten2)
+                        .Padding(20)
+                        .Text("This is test.")
+                        .FontSize(20);
+                });
+        }
+        
+        [Test]
+        public void Shrink_Both()
+        {
+            RenderingTest
+                .Create()
+                .PageSize(300, 200)
+                .ProduceImages()
+                .ShowResults()
+                .Render(container =>
+                {
+                    container
+                        .Padding(20)
+                        .Border(2)
+                        .Shrink()
+                        .Background(Colors.Grey.Lighten2)
+                        .Padding(20)
+                        .Text("This is test.")
+                        .FontSize(20);
+                });
+        }
+    }
+}

QuestPDF.Examples/TextBenchmark.cs

@@ -111,7 +111,7 @@ namespace QuestPDF.Examples
             {
                 page.Margin(50);
                 
-                page.Content().Column(column =>
+                page.Content().PaddingVertical(10).Column(column =>
                 {
                     column.Item().Element(Title);
                     column.Item().PageBreak();

QuestPDF.Examples/TextExamples.cs

@@ -2,6 +2,7 @@
 using System.Linq;
 using System.Text;
 using NUnit.Framework;
+using QuestPDF.Elements.Text;
 using QuestPDF.Examples.Engine;
 using QuestPDF.Fluent;
 using QuestPDF.Helpers;
@@ -618,5 +619,43 @@ namespace QuestPDF.Examples
                         .FontSize(20);
                 });
         }
+        
+        [Test]
+        public void FontFallback()
+        {
+            RenderingTest
+                .Create()
+                .ProduceImages()
+                .ShowResults()
+                .RenderDocument(container =>
+                {
+                    container.Page(page =>
+                    {
+                        page.Margin(50);
+                        page.PageColor(Colors.White);
+                        page.DefaultTextStyle(x => x
+                            .Fallback(y => y.FontFamily("Segoe UI Emoji")
+                                .Fallback(y => y.FontFamily("Microsoft YaHei"))));
+
+                        page.Size(PageSizes.A4);
+
+                        page.Content().Text(t =>
+                        {
+                            t.Line("This is normal text.");
+                            t.EmptyLine();
+                            
+                            t.Line("Following line should use font fallback:");
+                            t.Line("中文文本");
+                            t.EmptyLine();
+                            
+                            t.Line("The following line contains a mix of known and unknown characters.");
+                            t.Line("Mixed line: This 中文 is 文文 a mixed 本 本 line 本 中文文本!");
+                            t.EmptyLine();
+
+                            t.Line("Emojis work out of the box because of font fallback: 😊😅🥳👍❤😍👌");
+                        });
+                    });
+                });
+        }
     }
 }

QuestPDF.Previewer/QuestPDF.Previewer.csproj

@@ -4,7 +4,7 @@
         <Authors>MarcinZiabek</Authors>
         <Company>CodeFlint</Company>
         <PackageId>QuestPDF.Previewer</PackageId>
-        <Version>2022.8.0</Version>
+        <Version>2022.9.1</Version>
         <PackAsTool>true</PackAsTool>
         <ToolCommandName>questpdf-previewer</ToolCommandName>
         <PackageDescription>QuestPDF is an open-source, modern and battle-tested library that can help you with generating PDF documents by offering friendly, discoverable and predictable C# fluent API.</PackageDescription>

QuestPDF.UnitTests/ShrinkTests.cs

@@ -7,18 +7,20 @@ using QuestPDF.UnitTests.TestEngine;
 namespace QuestPDF.UnitTests
 {
     [TestFixture]
-    public class BoxTests
+    public class ShrinkTests
     {
         [Test]
-        public void Measure() => SimpleContainerTests.Measure<MinimalBox>();
+        public void Measure() => SimpleContainerTests.Measure<Shrink>();
         
         [Test]
         public void Draw_Wrap()
         {
             TestPlan
-                .For(x => new MinimalBox
+                .For(x => new Shrink
                 {
-                    Child = x.CreateChild()
+                    Child = x.CreateChild(),
+                    ShrinkVertical = true,
+                    ShrinkHorizontal = true
                 })
                 .DrawElement(new Size(400, 300))
                 .ExpectChildMeasure(expectedInput: new Size(400, 300), returns: SpacePlan.Wrap())
@@ -29,9 +31,11 @@ namespace QuestPDF.UnitTests
         public void Measure_PartialRender()
         {
             TestPlan
-                .For(x => new MinimalBox
+                .For(x => new Shrink
                 {
-                    Child = x.CreateChild()
+                    Child = x.CreateChild(),
+                    ShrinkVertical = true,
+                    ShrinkHorizontal = true
                 })
                 .MeasureElement(new Size(400, 300))
                 .ExpectChildMeasure(expectedInput: new Size(400, 300), returns: SpacePlan.PartialRender(200, 100))
@@ -43,9 +47,11 @@ namespace QuestPDF.UnitTests
         public void Measure_FullRender()
         {
             TestPlan
-                .For(x => new MinimalBox
+                .For(x => new Shrink
                 {
-                    Child = x.CreateChild()
+                    Child = x.CreateChild(),
+                    ShrinkVertical = true,
+                    ShrinkHorizontal = true
                 })
                 .MeasureElement(new Size(500, 400))
                 .ExpectChildMeasure(expectedInput: new Size(500, 400), returns: SpacePlan.FullRender(300, 200))

QuestPDF/Drawing/DocumentGenerator.cs

@@ -172,7 +172,7 @@ namespace QuestPDF.Drawing
                 {
                     if (textBlockItem is TextBlockSpan textSpan)
                     {
-                        textSpan.Style = textSpan.Style.ApplyGlobalStyle(TextStyle.LibraryDefault);
+                        textSpan.Style = textSpan.Style.ApplyGlobalStyle(documentDefaultTextStyle);
                     }
                     else if (textBlockItem is TextBlockElement textElement)
                     {

QuestPDF/Drawing/Exceptions/DocumentDrawingException.cs

@@ -4,6 +4,11 @@ namespace QuestPDF.Drawing.Exceptions
 {
     public class DocumentDrawingException : Exception
     {
+        internal DocumentDrawingException(string message) : base(message)
+        {
+            
+        }
+        
         internal DocumentDrawingException(string message, Exception inner) : base(message, inner)
         {
             

QuestPDF/Drawing/TextMeasurement.cs

@@ -1,8 +0,0 @@
-namespace QuestPDF.Drawing
-{
-    internal struct TextMeasurement
-    {
-        public int LineIndex { get; set; }
-        public float FragmentWidth { get; set; }
-    }
-}

QuestPDF/Drawing/TextShaper.cs

@@ -55,9 +55,6 @@ namespace QuestPDF.Drawing
                 xOffset += glyphPositions[i].XAdvance * scaleX;
                 yOffset += glyphPositions[i].YAdvance * scaleY;
             }
-
-            if (Settings.CheckIfAllTextGlyphsAreAvailableInSpecifiedFont)
-                CheckIfAllGlyphsAreAvailable(glyphs, text);
             
             return new TextShapingResult(glyphs);
         }
@@ -78,20 +75,6 @@ namespace QuestPDF.Drawing
             else
                 throw new NotSupportedException("TextEncoding of type GlyphId is not supported.");
         }
-        
-        void CheckIfAllGlyphsAreAvailable(ShapedGlyph[] glyphs, string originalText)
-        {
-            var containsMissingGlyphs = glyphs.Any(x => x.Codepoint == default);
-            
-            if (!containsMissingGlyphs)
-                return;
-            
-            throw new ArgumentException(
-                $"Detected missing font glyphs while rendering text. " +
-                $"This means that the document contains text with characters not present in the assigned font. " +
-                $"Such characters are replaced by placeholders, usually visible as empty rectangles. " +
-                $"Font family used: {TextStyle.FontFamily}. Issue detected in text: '{originalText}'");
-        }
     }
     
     internal struct ShapedGlyph

QuestPDF/Elements/MinimalBox.cs

@@ -1,18 +0,0 @@
-using QuestPDF.Drawing;
-using QuestPDF.Infrastructure;
-
-namespace QuestPDF.Elements
-{
-    internal class MinimalBox : ContainerElement
-    {
-        internal override void Draw(Size availableSpace)
-        {
-            var targetSize = base.Measure(availableSpace);
-            
-            if (targetSize.Type == SpacePlanType.Wrap)
-                return;
-            
-            base.Draw(targetSize);
-        }
-    }
-}

QuestPDF/Elements/RelativePadding.cs

@@ -0,0 +1,65 @@
+using System;
+using QuestPDF.Drawing;
+using QuestPDF.Infrastructure;
+
+namespace QuestPDF.Elements
+{
+    internal class RelativePadding : ContainerElement
+    {
+        public float Top { get; set; }
+        public float Right { get; set; }
+        public float Bottom { get; set; }
+        public float Left { get; set; }
+
+        internal override SpacePlan Measure(Size availableSpace)
+        {
+            if (Child == null)
+                return SpacePlan.FullRender(0, 0);
+            
+            var internalSpace = InternalSpace(availableSpace);
+
+            if (internalSpace.Width < 0 || internalSpace.Height < 0)
+                return SpacePlan.Wrap();
+            
+            var measure = base.Measure(internalSpace);
+
+            if (measure.Type == SpacePlanType.Wrap)
+                return SpacePlan.Wrap();
+
+            if (measure.Type == SpacePlanType.PartialRender)
+                return SpacePlan.PartialRender(availableSpace);
+            
+            if (measure.Type == SpacePlanType.FullRender)
+                return SpacePlan.FullRender(availableSpace);
+            
+            throw new NotSupportedException();
+        }
+
+        internal override void Draw(Size availableSpace)
+        {
+            if (Child == null)
+                return;
+
+            var internalOffset = InternalOffset(availableSpace);
+            var internalSpace = InternalSpace(availableSpace);
+            
+            Canvas.Translate(internalOffset);
+            base.Draw(internalSpace);
+            Canvas.Translate(internalOffset.Reverse());
+        }
+
+        private Position InternalOffset(Size availableSpace)
+        {
+            return new Position(
+                availableSpace.Width * Left,
+                availableSpace.Height * Top);
+        }
+        
+        private Size InternalSpace(Size availableSpace)
+        {
+            return new Size(
+                availableSpace.Width * (1f - Left - Right),
+                availableSpace.Height * (1f - Top - Bottom));
+        }
+    }
+}

QuestPDF/Elements/RelativePosition.cs

@@ -0,0 +1,33 @@
+using System;
+using QuestPDF.Drawing;
+using QuestPDF.Infrastructure;
+
+namespace QuestPDF.Elements
+{
+    internal class RelativePosition : ContainerElement
+    {
+        public float VerticalParent { get; set; }
+        public float VerticalChild { get; set; }
+        
+        public float HorizontalParent { get; set; }
+        public float HorizontalChild { get; set; } 
+        
+        internal override void Draw(Size availableSpace)
+        {
+            if (Child == null)
+                return;
+            
+            var childSize = base.Measure(availableSpace);
+            
+            if (childSize.Type == SpacePlanType.Wrap)
+                return;
+            
+            var left = availableSpace.Width * HorizontalParent + childSize.Width * HorizontalChild;
+            var top = availableSpace.Height * VerticalParent + childSize.Height * VerticalChild;
+
+            Canvas.Translate(new Position(left, top));
+            base.Draw(childSize);
+            Canvas.Translate(new Position(-left, -top));
+        }
+    }
+}

QuestPDF/Elements/RelativeSize.cs

@@ -0,0 +1,36 @@
+using System;
+using QuestPDF.Drawing;
+using QuestPDF.Infrastructure;
+
+namespace QuestPDF.Elements
+{
+    internal class RelativeSize : ContainerElement
+    {
+        public float? WidthFactor { get; set; } = 1f;
+        public float? HeightFactor { get; set; } = 1f;
+
+        internal override SpacePlan Measure(Size availableSpace)
+        {
+            var internalSpace = new Size(
+                availableSpace.Width * (WidthFactor ?? 1),
+                availableSpace.Height * (HeightFactor ?? 1));
+            
+            var childSpace = Child?.Measure(internalSpace) ?? SpacePlan.FullRender(0, 0);
+
+            if (childSpace.Type == SpacePlanType.Wrap)
+                return SpacePlan.Wrap();
+
+            var targetSpace = new Size(
+                WidthFactor.HasValue ? internalSpace.Width : childSpace.Width,
+                HeightFactor.HasValue ? internalSpace.Height : childSpace.Height);
+            
+            if (childSpace.Type == SpacePlanType.PartialRender)
+                return SpacePlan.PartialRender(targetSpace);
+            
+            if (childSpace.Type == SpacePlanType.FullRender)
+                return SpacePlan.FullRender(targetSpace);
+
+            throw new ArgumentException();
+        }
+    }
+}

QuestPDF/Elements/Shrink.cs

@@ -0,0 +1,27 @@
+using QuestPDF.Drawing;
+using QuestPDF.Infrastructure;
+
+namespace QuestPDF.Elements
+{
+    internal class Shrink : ContainerElement
+    {
+        public bool ShrinkVertical { get; set; }
+        public bool ShrinkHorizontal { get; set; }
+        
+        internal override void Draw(Size availableSpace)
+        {
+            var childSize = base.Measure(availableSpace);
+
+            if (childSize.Type == SpacePlanType.Wrap)
+                return;
+            
+            var targetSize = new Size(
+                ShrinkVertical ? childSize.Width : availableSpace.Width,
+                ShrinkHorizontal ? childSize.Height : availableSpace.Height);
+            
+            // TODO: adjust offset for RTL mode
+            
+            base.Draw(targetSize);
+        }
+    }
+}

QuestPDF/Elements/Text/FontFallback.cs

@@ -0,0 +1,150 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using QuestPDF.Drawing;
+using QuestPDF.Drawing.Exceptions;
+using QuestPDF.Elements.Text.Items;
+using QuestPDF.Fluent;
+using QuestPDF.Infrastructure;
+using SkiaSharp;
+
+namespace QuestPDF.Elements.Text
+{
+    internal static class FontFallback
+    {
+        public struct TextRun
+        {
+            public string Content { get; set; }
+            public TextStyle Style { get; set; }
+        }
+
+        public class FallbackOption
+        {
+            public TextStyle Style { get; set; }
+            public SKFont Font { get; set; }
+            public SKTypeface Typeface { get; set; }
+        }
+
+        private static SKFontManager FontManager => SKFontManager.Default;
+
+        public static IEnumerable<TextRun> SplitWithFontFallback(this string text, TextStyle textStyle)
+        {
+            var fallbackOptions = GetFallbackOptions(textStyle).ToArray();
+            
+            var spanStartIndex = 0;
+            var spanFallbackOption = fallbackOptions[0];
+            
+            for (var i = 0; i < text.Length; i += char.IsSurrogatePair(text, i) ? 2 : 1)
+            {
+                var codepoint = char.ConvertToUtf32(text, i);
+                var newFallbackOption = MatchFallbackOption(fallbackOptions, codepoint);
+
+                if (newFallbackOption == spanFallbackOption)
+                    continue;
+
+                yield return new TextRun
+                {
+                    Content = text.Substring(spanStartIndex, i - spanStartIndex),
+                    Style = spanFallbackOption.Style
+                };
+
+                spanStartIndex = i;
+                spanFallbackOption = newFallbackOption;
+            }
+            
+            if (spanStartIndex > text.Length)
+                yield break;
+            
+            yield return new TextRun
+            {
+                Content = text.Substring(spanStartIndex, text.Length - spanStartIndex),
+                Style = spanFallbackOption.Style
+            };
+
+            static IEnumerable<FallbackOption> GetFallbackOptions(TextStyle? textStyle)
+            {
+                while (textStyle != null)
+                {
+                    var font = textStyle.ToFont();
+                    
+                    yield return new FallbackOption
+                    {
+                        Style = textStyle,
+                        Font = font,
+                        Typeface = font.Typeface
+                    };
+
+                    textStyle = textStyle.Fallback;
+                }
+            }
+
+            static FallbackOption MatchFallbackOption(ICollection<FallbackOption> fallbackOptions, int codepoint)
+            {
+                foreach (var fallbackOption in fallbackOptions)
+                {
+                    if (fallbackOption.Font.ContainsGlyph(codepoint))
+                        return fallbackOption;
+                }
+
+                throw CreateNotMatchingFontException(codepoint);
+            }
+
+            static Exception CreateNotMatchingFontException(int codepoint)
+            {
+                var character = char.ConvertFromUtf32(codepoint);
+                var unicode = $"U-{codepoint:X4}";
+
+                var proposedFonts = FindFontsContainingGlyph(codepoint);
+                var proposedFontsFormatted = proposedFonts.Any() ? string.Join(", ", proposedFonts) : "no fonts available";
+                
+                return new DocumentDrawingException(
+                    $"Could not find an appropriate font fallback for glyph: {unicode} '{character}'. " +
+                    $"Font families available on current environment that contain this glyph: {proposedFontsFormatted}. " +
+                    $"Possible solutions: " +
+                    $"1) Use one of the listed fonts as the primary font in your document. " +
+                    $"2) Configure the fallback TextStyle using the 'TextStyle.Fallback' method with one of the listed fonts. ");
+            }
+            
+            static IEnumerable<string> FindFontsContainingGlyph(int codepoint)
+            {
+                var fontManager = SKFontManager.Default;
+
+                return fontManager
+                    .GetFontFamilies()
+                    .Select(fontManager.MatchFamily)
+                    .Where(x => x.ContainsGlyph(codepoint))
+                    .Select(x => x.FamilyName);
+            }
+        }
+
+        public static IEnumerable<ITextBlockItem> ApplyFontFallback(this ICollection<ITextBlockItem> textBlockItems)
+        {
+            foreach (var textBlockItem in textBlockItems)
+            {
+                if (textBlockItem is TextBlockSpan textBlockSpan and not TextBlockPageNumber)
+                {
+                    if (!Settings.CheckIfAllTextGlyphsAreAvailable && textBlockSpan.Style.Fallback == null)
+                    {
+                        yield return textBlockSpan;
+                        continue;
+                    }
+                    
+                    var textRuns = textBlockSpan.Text.SplitWithFontFallback(textBlockSpan.Style);
+
+                    foreach (var textRun in textRuns)
+                    {
+                        yield return new TextBlockSpan
+                        {
+                            Text = textRun.Content,
+                            Style = textRun.Style
+                        };
+                    }
+                }
+                else
+                {
+                    yield return textBlockItem;
+                }
+            }
+        }
+    }
+}

QuestPDF/Elements/Text/TextBlock.cs

@@ -18,8 +18,11 @@ namespace QuestPDF.Elements.Text
         private Queue<ITextBlockItem> RenderingQueue { get; set; }
         private int CurrentElementIndex { get; set; }
 
+        private bool FontFallbackApplied { get; set; } = false;
+        
         public void ResetState()
         {
+            ApplyFontFallback();
             InitializeQueue();
             CurrentElementIndex = 0;
 
@@ -37,6 +40,15 @@ namespace QuestPDF.Elements.Text
                 foreach (var item in Items)
                     RenderingQueue.Enqueue(item);
             }
+
+            void ApplyFontFallback()
+            {
+                if (FontFallbackApplied)
+                    return;
+
+                Items = Items.ApplyFontFallback().ToList();
+                FontFallbackApplied = true;
+            }
         }
 
         internal override SpacePlan Measure(Size availableSpace)

QuestPDF/Fluent/ElementExtensions.cs

@@ -154,17 +154,6 @@ namespace QuestPDF.Fluent
             });
         }
         
-        [Obsolete("This element has been renamed since version 2022.1. Please use the MinimalBox method.")]
-        public static IContainer Box(this IContainer element)
-        {
-            return element.Element(new MinimalBox());
-        }
-        
-        public static IContainer MinimalBox(this IContainer element)
-        {
-            return element.Element(new MinimalBox());
-        }
-        
         public static IContainer Unconstrained(this IContainer element)
         {
             return element.Element(new Unconstrained());

QuestPDF/Fluent/RelativePaddingExtensions.cs

@@ -0,0 +1,37 @@
+using System;
+using QuestPDF.Elements;
+using QuestPDF.Infrastructure;
+
+namespace QuestPDF.Fluent
+{
+    public static class RelativePaddingExtensions
+    {
+        private static IContainer RelativePadding(this IContainer element, Action<RelativePadding> handler)
+        {
+            var relativePadding = element as RelativePadding ?? new RelativePadding();
+            handler(relativePadding);
+            
+            return element.Element(relativePadding);
+        }
+
+        public static IContainer RelativePaddingTop(this IContainer element, float value)
+        {
+            return element.RelativePadding(x => x.Top += value);
+        }
+        
+        public static IContainer RelativePaddingBottom(this IContainer element, float value)
+        {
+            return element.RelativePadding(x => x.Bottom += value);
+        }
+        
+        public static IContainer RelativePaddingLeft(this IContainer element, float value)
+        {
+            return element.RelativePadding(x => x.Left += value);
+        }
+        
+        public static IContainer RelativePaddingRight(this IContainer element, float value)
+        {
+            return element.RelativePadding(x => x.Right += value);
+        }
+    }
+}

QuestPDF/Fluent/RelativePositionExtensions.cs

@@ -0,0 +1,35 @@
+using System;
+using QuestPDF.Elements;
+using QuestPDF.Infrastructure;
+
+namespace QuestPDF.Fluent
+{
+    public static class RelativePositionExtensions
+    {
+        private static IContainer RelativePosition(this IContainer element, Action<RelativePosition> handler)
+        {
+            var relativePosition = element as RelativePosition ?? new RelativePosition();
+            handler(relativePosition);
+            
+            return element.Element(relativePosition);
+        }
+
+        public static IContainer RelativePositionVertical(this IContainer element, float parentOffset, float childOffset)
+        {
+            return element.RelativePosition(x =>
+            {
+                x.VerticalParent = parentOffset;
+                x.VerticalChild = childOffset;
+            });
+        }
+        
+        public static IContainer RelativePositionHorizontal(this IContainer element, float parentOffset, float childOffset)
+        {
+            return element.RelativePosition(x =>
+            {
+                x.HorizontalParent = parentOffset;
+                x.HorizontalChild = childOffset;
+            });
+        }
+    }
+}

QuestPDF/Fluent/RelativeSizeExtensions.cs

@@ -0,0 +1,27 @@
+using System;
+using QuestPDF.Elements;
+using QuestPDF.Infrastructure;
+
+namespace QuestPDF.Fluent
+{
+    public static class RelativeSizeExtensions
+    {
+        private static IContainer RelativeSize(this IContainer element, Action<RelativeSize> handler)
+        {
+            var relativeSize = element as RelativeSize ?? new RelativeSize();
+            handler(relativeSize);
+            
+            return element.Element(relativeSize);
+        }
+
+        public static IContainer RelativeWidth(this IContainer element, float value)
+        {
+            return element.RelativeSize(x => x.WidthFactor = value);
+        }
+        
+        public static IContainer RelativeHeight(this IContainer element, float value)
+        {
+            return element.RelativeSize(x => x.HeightFactor = value);
+        }
+    }
+}

QuestPDF/Fluent/ShrinkExtensions.cs

@@ -0,0 +1,48 @@
+using System;
+using QuestPDF.Elements;
+using QuestPDF.Infrastructure;
+
+namespace QuestPDF.Fluent
+{
+    public static class ShrinkExtensions
+    {
+        private static IContainer Shrink(this IContainer element, Action<Shrink> handler)
+        {
+            var shrink = element as Shrink ?? new Shrink();
+            handler(shrink);
+            
+            return element.Element(shrink);
+        }
+        
+        public static IContainer Shrink(this IContainer element)
+        {
+            return element.ShrinkVertical().ShrinkHorizontal();
+        }
+        
+        public static IContainer ShrinkVertical(this IContainer element)
+        {
+            return element.Shrink(x => x.ShrinkVertical = true);
+        }
+        
+        public static IContainer ShrinkHorizontal(this IContainer element)
+        {
+            return element.Shrink(x => x.ShrinkHorizontal = true);
+        }
+
+        #region Obsolete
+        
+        [Obsolete("This element has been renamed since version 2022.1. Please use the Shrink method.")]
+        public static IContainer Box(this IContainer element)
+        {
+            return element.Element(new Shrink());
+        }
+        
+        [Obsolete("This element has been renamed since version 2022.11. Please use the Shrink method.")]
+        public static IContainer MinimalBox(this IContainer element)
+        {
+            return element.Element(new Shrink());
+        }
+
+        #endregion
+    }
+}

QuestPDF/Fluent/TextExtensions.cs

@@ -36,6 +36,7 @@ namespace QuestPDF.Fluent
         internal TextPageNumberDescriptor(Action<TextStyle> assignTextStyle, Action<PageNumberFormatter> assignFormatFunction) : base(assignTextStyle)
         {
             AssignFormatFunction = assignFormatFunction;
+            AssignFormatFunction(x => x?.ToString());
         }
 
         public TextPageNumberDescriptor Format(PageNumberFormatter formatter)

QuestPDF/Fluent/TextSpanDescriptorExtensions.cs

@@ -15,6 +15,17 @@ namespace QuestPDF.Fluent
             return descriptor;
         }
         
+        public static T Fallback<T>(this T descriptor, TextStyle? value = null) where T : TextSpanDescriptor
+        {
+            descriptor.TextStyle.Fallback = value;
+            return descriptor;
+        }
+        
+        public static T Fallback<T>(this T descriptor, Func<TextStyle, TextStyle> handler) where T : TextSpanDescriptor
+        {
+            return descriptor.Fallback(handler(TextStyle.Default));
+        }
+        
         public static T FontColor<T>(this T descriptor, string value) where T : TextSpanDescriptor
         {
             descriptor.MutateTextStyle(x => x.FontColor(value));

QuestPDF/Fluent/TextStyleExtensions.cs

@@ -4,8 +4,6 @@ using QuestPDF.Infrastructure;
 
 namespace QuestPDF.Fluent
 {
-    
-    
     public static class TextStyleExtensions
     {
         [Obsolete("This element has been renamed since version 2022.3. Please use the FontColor method.")]
@@ -131,6 +129,7 @@ namespace QuestPDF.Fluent
         #endregion
 
         #region Position
+        
         public static TextStyle NormalPosition(this TextStyle style)
         {
             return style.Position(FontPosition.Normal);
@@ -150,6 +149,21 @@ namespace QuestPDF.Fluent
         {
             return style.Mutate(TextStyleProperty.FontPosition, fontPosition);
         }
+        
+        #endregion
+
+        #region Fallback
+        
+        public static TextStyle Fallback(this TextStyle style, TextStyle? value = null)
+        {
+            return style.Mutate(TextStyleProperty.Fallback, value);
+        }
+        
+        public static TextStyle Fallback(this TextStyle style, Func<TextStyle, TextStyle> handler)
+        {
+            return style.Fallback(handler(TextStyle.Default));
+        }
+
         #endregion
     }
 }

QuestPDF/Infrastructure/TextStyle.cs

@@ -17,6 +17,8 @@ namespace QuestPDF.Infrastructure
         internal bool? HasUnderline { get; set; }
         internal bool? WrapAnywhere { get; set; }
 
+        internal TextStyle? Fallback { get; set; }
+
         internal static TextStyle LibraryDefault { get; } = new()
         {
             Color = Colors.Black,
@@ -29,7 +31,8 @@ namespace QuestPDF.Infrastructure
             IsItalic = false,
             HasStrikethrough = false,
             HasUnderline = false,
-            WrapAnywhere = false
+            WrapAnywhere = false,
+            Fallback = null
         };
 
         public static TextStyle Default { get; } = new();

QuestPDF/Infrastructure/TextStyleManager.cs

@@ -16,13 +16,15 @@ namespace QuestPDF.Infrastructure
         IsItalic,
         HasStrikethrough,
         HasUnderline,
-        WrapAnywhere
+        WrapAnywhere,
+        Fallback
     }
     
     internal static class TextStyleManager
     {
-        public static ConcurrentDictionary<(TextStyle origin, TextStyleProperty property, object value), TextStyle> TextStyleMutateCache = new();
-        public static ConcurrentDictionary<(TextStyle origin, TextStyle parent, bool overrideValue), TextStyle> TextStyleApplyCache = new();
+        private static readonly ConcurrentDictionary<(TextStyle origin, TextStyleProperty property, object value), TextStyle> TextStyleMutateCache = new();
+        private static readonly ConcurrentDictionary<(TextStyle origin, TextStyle parent), TextStyle> TextStyleApplyGlobalCache = new();
+        private static readonly ConcurrentDictionary<(TextStyle origin, TextStyle parent), TextStyle> TextStyleOverrideCache = new();
 
         public static TextStyle Mutate(this TextStyle origin, TextStyleProperty property, object value)
         {
@@ -30,7 +32,7 @@ namespace QuestPDF.Infrastructure
             return TextStyleMutateCache.GetOrAdd(cacheKey, x => MutateStyle(x.origin, x.property, x.value));
         }
 
-        private static TextStyle MutateStyle(TextStyle origin, TextStyleProperty property, object value, bool overrideValue = true)
+        private static TextStyle MutateStyle(TextStyle origin, TextStyleProperty property, object? value, bool overrideValue = true)
         {
             if (overrideValue && value == null)
                 return origin;
@@ -177,38 +179,69 @@ namespace QuestPDF.Infrastructure
                 
                 return origin with { WrapAnywhere = castedValue };
             }
+            
+            if (property == TextStyleProperty.Fallback)
+            {
+                if (!overrideValue && origin.Fallback != null)
+                    return origin;
+
+                var castedValue = (TextStyle?)value;
+                
+                if (origin.Fallback == castedValue)
+                    return origin;
+                
+                return origin with { Fallback = castedValue };
+            }
 
             throw new ArgumentOutOfRangeException(nameof(property), property, "Expected to mutate the TextStyle object. Provided property type is not supported.");
         }
         
         internal static TextStyle ApplyGlobalStyle(this TextStyle style, TextStyle parent)
         {
-            var cacheKey = (style, parent, false);
-            return TextStyleApplyCache.GetOrAdd(cacheKey, key => ApplyStyle(key.origin, key.parent, key.overrideValue));
+            var cacheKey = (style, parent);
+            return TextStyleApplyGlobalCache.GetOrAdd(cacheKey, key => ApplyStyle(key.origin, key.parent, overrideStyle: false).ApplyFontFallback());
+        }
+        
+        private static TextStyle ApplyFontFallback(this TextStyle style)
+        {
+            var targetFallbackStyle = style
+                ?.Fallback
+                ?.ApplyStyle(style, overrideStyle: false, applyFallback: false)
+                ?.ApplyFontFallback();
+            
+            return MutateStyle(style, TextStyleProperty.Fallback, targetFallbackStyle);
         }
         
         internal static TextStyle OverrideStyle(this TextStyle style, TextStyle parent)
         {
-            var cacheKey = (style, parent, true);
-            return TextStyleApplyCache.GetOrAdd(cacheKey, key => ApplyStyle(key.origin, key.parent, key.overrideValue));
+            var cacheKey = (style, parent);
+            
+            return TextStyleOverrideCache.GetOrAdd(cacheKey, key =>
+            {
+                var result = ApplyStyle(key.origin, key.parent);
+                return MutateStyle(result, TextStyleProperty.Fallback, key.parent.Fallback);
+            });
         }
         
-        private static TextStyle ApplyStyle(TextStyle style, TextStyle parent, bool overrideValue)
+        private static TextStyle ApplyStyle(this TextStyle style, TextStyle parent, bool overrideStyle = true, bool applyFallback = true)
         {
             var result = style;
 
-            result = MutateStyle(result, TextStyleProperty.Color, parent.Color, overrideValue);
-            result = MutateStyle(result, TextStyleProperty.BackgroundColor, parent.BackgroundColor, overrideValue);
-            result = MutateStyle(result, TextStyleProperty.FontFamily, parent.FontFamily, overrideValue);
-            result = MutateStyle(result, TextStyleProperty.Size, parent.Size, overrideValue);
-            result = MutateStyle(result, TextStyleProperty.LineHeight, parent.LineHeight, overrideValue);
-            result = MutateStyle(result, TextStyleProperty.FontWeight, parent.FontWeight, overrideValue);
-            result = MutateStyle(result, TextStyleProperty.FontPosition, parent.FontPosition, overrideValue);
-            result = MutateStyle(result, TextStyleProperty.IsItalic, parent.IsItalic, overrideValue);
-            result = MutateStyle(result, TextStyleProperty.HasStrikethrough, parent.HasStrikethrough, overrideValue);
-            result = MutateStyle(result, TextStyleProperty.HasUnderline, parent.HasUnderline, overrideValue);
-            result = MutateStyle(result, TextStyleProperty.WrapAnywhere, parent.WrapAnywhere, overrideValue);
+            result = MutateStyle(result, TextStyleProperty.Color, parent.Color, overrideStyle);
+            result = MutateStyle(result, TextStyleProperty.BackgroundColor, parent.BackgroundColor, overrideStyle);
+            result = MutateStyle(result, TextStyleProperty.FontFamily, parent.FontFamily, overrideStyle);
+            result = MutateStyle(result, TextStyleProperty.Size, parent.Size, overrideStyle);
+            result = MutateStyle(result, TextStyleProperty.LineHeight, parent.LineHeight, overrideStyle);
+            result = MutateStyle(result, TextStyleProperty.FontWeight, parent.FontWeight, overrideStyle);
+            result = MutateStyle(result, TextStyleProperty.FontPosition, parent.FontPosition, overrideStyle);
+            result = MutateStyle(result, TextStyleProperty.IsItalic, parent.IsItalic, overrideStyle);
+            result = MutateStyle(result, TextStyleProperty.HasStrikethrough, parent.HasStrikethrough, overrideStyle);
+            result = MutateStyle(result, TextStyleProperty.HasUnderline, parent.HasUnderline, overrideStyle);
+            result = MutateStyle(result, TextStyleProperty.WrapAnywhere, parent.WrapAnywhere, overrideStyle);
             
+            if (applyFallback)
+                result = MutateStyle(result, TextStyleProperty.Fallback, parent.Fallback, overrideStyle);
+
             return result;
         }
     }

QuestPDF/Previewer/PreviewerService.cs

@@ -19,7 +19,7 @@ namespace QuestPDF.Previewer
         public  event Action? OnPreviewerStopped;
 
         private const int RequiredPreviewerVersionMajor = 2022;
-        private const int RequiredPreviewerVersionMinor = 8;
+        private const int RequiredPreviewerVersionMinor = 9;
         
         public PreviewerService(int port)
         {

QuestPDF/QuestPDF.csproj

@@ -3,7 +3,7 @@
         <Authors>MarcinZiabek</Authors>
         <Company>CodeFlint</Company>
         <PackageId>QuestPDF</PackageId>
-        <Version>2022.8.2</Version>
+        <Version>2022.9.0</Version>
         <PackageDescription>QuestPDF is an open-source, modern and battle-tested library that can help you with generating PDF documents by offering friendly, discoverable and predictable C# fluent API.</PackageDescription>
         <PackageReleaseNotes>$([System.IO.File]::ReadAllText("$(MSBuildProjectDirectory)/Resources/ReleaseNotes.txt"))</PackageReleaseNotes>
         <LangVersion>9</LangVersion>

QuestPDF/Resources/ReleaseNotes.txt

@@ -1,20 +1,6 @@
-2022.8.0:
-
-- Improved library performance,
-- Breaking change: changed default font from Calibri to an open-source Lato,
-- Default font files are included with the nuget package, making it safe to deploy on any environment,
-- Default font files are significantly smaller, so output document files should be smaller too (up to 20x reduction in size),
-- When requested font is not available on the runtime environment, library provides list of available fonts,
-- Fixed a rare layout overflow exception with the Inlined element,
-- Fixed a memory leak connected to the HarfBuzz library.
-
-
-2022.8.1:
-- Fixed: default text style does not always work
-- Fixed: page breaking rendering does not work in very specific corner cases
-- Stability improvements for text wrapping
-- Updated stability of rendering elements in negative space
-- Optimization for the Column element: do not measure child when available height is negative
-
-2022.8.2
-- Fixed: the Column element incorrectly renders zero-height elements.
+2022.9.0
+- Implemented font-fallback algorithm,
+- Introduced new Settings API,
+- Significantly reduced memory allocation cost for TextStyle objects,
+- Implemented optional checking if all font glyphs are available,
+- Minor text-rendering optimizations.

QuestPDF/Settings.cs

@@ -3,7 +3,7 @@
     public static class Settings
     {
         /// <summary>
-        /// This value represents the maximum lenght of the document that the library produces.
+        /// This value represents the maximum length of the document that the library produces.
         /// This is useful when layout constraints are too strong, e.g. one element does not fit in another.
         /// In such cases, the library would produce document of infinite length, consuming all available resources.
         /// To break the algorithm and save the environment, the library breaks the rendering process after reaching specified length of document.
@@ -35,6 +35,6 @@
         /// However, it provides hints that used fonts are not sufficient to produce correct results.
         /// </summary>
         /// <remarks>By default, this flag is enabled only when the debugger IS attached.</remarks>
-        public static bool CheckIfAllTextGlyphsAreAvailableInSpecifiedFont { get; set; } = System.Diagnostics.Debugger.IsAttached;
+        public static bool CheckIfAllTextGlyphsAreAvailable { get; set; } = System.Diagnostics.Debugger.IsAttached;
     }
 }

readme.md

@@ -23,7 +23,8 @@ Choosing a project dependency could be difficult. We need to ensure stability an
 
 ⭐ Please give this repository a star. It takes seconds and help thousands of developers! ⭐
 
-<img src="https://user-images.githubusercontent.com/9263853/184642026-27dd7567-a46a-45d4-9594-e6a70a7193e9.png" width="700" />
+<img src="https://user-images.githubusercontent.com/9263853/190931857-8ca52ec8-cc7d-4d12-9467-4442b3342fa1.png" width="700" />
+
 
 ## Please share with the community