Implemented simple object cache, and updated some fluent api invocations

QuestPDF.Examples/Engine/RenderingTest.cs

@@ -65,9 +65,9 @@ namespace QuestPDF.Examples.Engine
             return this;
         }
 
-        public RenderingTest ShowResults()
+        public RenderingTest ShowResults(bool value = true)
         {
-            ShowResult = true;
+            ShowResult = value;
             return this;
         }
         

QuestPDF.Examples/TableBenchmark.cs

@@ -1,8 +1,13 @@
-using System.Linq;
+using System;
+using System.Diagnostics;
+using System.Linq;
 using NUnit.Framework;
+using QuestPDF.Drawing;
+using QuestPDF.Elements;
 using QuestPDF.Examples.Engine;
 using QuestPDF.Fluent;
 using QuestPDF.Helpers;
+using QuestPDF.Infrastructure;
 
 namespace QuestPDF.Examples
 {
@@ -11,36 +16,77 @@ namespace QuestPDF.Examples
         [Test]
         public void Benchmark()
         {
-            RenderingTest
-                .Create()
-                .ProducePdf()
-                .PageSize(PageSizes.A4)
-                .ShowResults()
-                .MaxPages(10_000)
-                .EnableCaching(true)
-                .EnableDebugging(false)
-                .Render(container =>
-                {
-                    container
-                        .Padding(10)
-                        .MinimalBox()
-                        .Border(1)
-                        .Table(table =>
-                        {
-                            const int numberOfRows = 100_000;
-                            const int numberOfColumns = 10;
-                            
-                            table.ColumnsDefinition(columns =>
-                            {
-                                foreach (var _ in Enumerable.Range(0, numberOfColumns))
-                                    columns.RelativeColumn();
-                            });
+            GenerateAndCollect();
 
-                            foreach (var row in Enumerable.Range(0, numberOfRows))
-                            foreach (var column in Enumerable.Range(0, numberOfColumns))
-                                table.Cell().Background(Placeholders.BackgroundColor()).Padding(5).Text($"{row}_{column}");
-                        });
-                });
+            var stopwatch = new Stopwatch();
+            stopwatch.Start();
+
+            foreach (var _ in Enumerable.Range(0, 10000))
+            {
+                GenerateAndCollect();
+            }
+            
+            stopwatch.Stop();
+            
+            Console.WriteLine($"Execution time: {stopwatch.Elapsed:g}");
+
+            void GenerateAndCollect()
+            {
+                var container = new Container();
+                
+                container
+                    .Padding(10)
+                    .MinimalBox()
+                    .Border(1)
+                    .Column(column =>
+                    {
+                        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);
+                                }
+                            });
+                        }  
+                    });
+
+                ElementCacheManager.Collect(container);
+            }
         }
     }
 }

QuestPDF.Examples/TextBenchmark.cs

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

QuestPDF.Examples/TextExamples.cs

@@ -2,7 +2,6 @@
 using System.Linq;
 using System.Text;
 using NUnit.Framework;
-using QuestPDF.Elements.Text;
 using QuestPDF.Examples.Engine;
 using QuestPDF.Fluent;
 using QuestPDF.Helpers;
@@ -619,43 +618,5 @@ 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>2022.9.1</Version>
+        <Version>2022.8.0</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/Drawing/DocumentGenerator.cs

@@ -64,8 +64,6 @@ namespace QuestPDF.Drawing
             var container = new DocumentContainer();
             document.Compose(container);
             var content = container.Compose();
-
-            ApplyRepeatContent(content);
             ApplyDefaultTextStyle(content, TextStyle.LibraryDefault);
             
             var debuggingState = Settings.EnableDebugging ? ApplyDebugging(content) : null;
@@ -76,6 +74,8 @@ namespace QuestPDF.Drawing
             var pageContext = new PageContext();
             RenderPass(pageContext, new FreeCanvas(), content, debuggingState);
             RenderPass(pageContext, canvas, content, debuggingState);
+            
+            ElementCacheManager.Collect(content);
         }
         
         internal static void RenderPass<TCanvas>(PageContext pageContext, TCanvas canvas, Container content, DebuggingState? debuggingState)
@@ -174,7 +174,7 @@ namespace QuestPDF.Drawing
                 {
                     if (textBlockItem is TextBlockSpan textSpan)
                     {
-                        textSpan.Style = textSpan.Style.ApplyGlobalStyle(documentDefaultTextStyle);
+                        textSpan.Style = textSpan.Style.ApplyGlobalStyle(TextStyle.LibraryDefault);
                     }
                     else if (textBlockItem is TextBlockElement textElement)
                     {
@@ -194,23 +194,5 @@ namespace QuestPDF.Drawing
             foreach (var child in content.GetChildren())
                 ApplyDefaultTextStyle(child, documentDefaultTextStyle);
         }
-        
-        internal static void ApplyRepeatContent(this Element? content, bool enabled = false)
-        {
-            if (content == null)
-                return;
-
-            if (content is RepeatContent repeatContent)
-            {
-                ApplyRepeatContent(repeatContent.Child, repeatContent.Repeat);
-                return;
-            }
-            
-            foreach (var child in content.GetChildren())
-                ApplyRepeatContent(child, enabled);
-            
-            if (!enabled)
-                content.CreateProxy(y => y is IContent ? new ShowOnce { Child = y } : y);
-        }
     }
 }

QuestPDF/Drawing/ElementCacheManager.cs

@@ -0,0 +1,76 @@
+using System;
+using System.Collections.Concurrent;
+using System.Runtime.CompilerServices;
+using QuestPDF.Infrastructure;
+
+namespace QuestPDF.Drawing
+{
+    internal class CircularBuffer
+    {
+        private const int BufferSize = 11_000;
+
+        private object[] Buffer = new object[BufferSize];
+        private int WriteIndex { get; set; } = 0;
+        private int ReadIndex { get; set; } = 0;
+        
+        public T Get<T>() where T : class, new()
+        {
+            lock (this)
+            {
+                if (ReadIndex == WriteIndex)
+                    return new T();
+                
+                var index = ReadIndex;
+                ReadIndex = (ReadIndex + 1) % BufferSize;
+                
+                var result = Buffer[index] as T;
+                Buffer[index] = null;
+                
+                return result;
+            }
+        }
+
+        public void Store(object value)
+        {
+            lock (this)
+            {
+                Buffer[WriteIndex] = value;
+                WriteIndex = (WriteIndex + 1) % BufferSize;
+            }
+        }
+    }
+    
+    // performance analysis:
+    // without: 115s
+    // ConcurrentQueue: 28s
+    // ConcurrentBag: 38s
+    // CircularBuffer: 30s
+    internal static class ElementCacheManager
+    {
+        private static ConcurrentDictionary<Type, ConcurrentQueue<object>> Cache { get; } = new();
+
+        public static T Get<T>() where T : class, new()
+        {
+            var buffer = Cache.GetOrAdd(typeof(T), _=> new ConcurrentQueue<object>());
+            return buffer.TryDequeue(out var result) ? result as T : new T();
+        }
+
+        public static void Store<T>(T element)
+        {
+            var buffer = Cache.GetOrAdd(element.GetType(), _=> new ConcurrentQueue<object>());
+            buffer.Enqueue(element);
+        }
+
+        public static void Collect(Element element)
+        {
+            foreach (var child in element.GetChildren())
+                Collect(child);
+
+            if (element is ICollectable collectable)
+            {
+                collectable.Collect();
+                Store(element);   
+            }
+        }
+    }
+}

QuestPDF/Drawing/Exceptions/DocumentDrawingException.cs

@@ -4,11 +4,6 @@ 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

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

QuestPDF/Drawing/TextShaper.cs

@@ -55,6 +55,9 @@ namespace QuestPDF.Drawing
                 xOffset += glyphPositions[i].XAdvance * scaleX;
                 yOffset += glyphPositions[i].YAdvance * scaleY;
             }
+
+            if (Settings.CheckIfAllTextGlyphsAreAvailableInSpecifiedFont)
+                CheckIfAllGlyphsAreAvailable(glyphs, text);
             
             return new TextShapingResult(glyphs);
         }
@@ -75,6 +78,20 @@ 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/Border.cs

@@ -41,5 +41,15 @@ namespace QuestPDF.Elements
         {
             return $"Border: Top({Top}) Right({Right}) Bottom({Bottom}) Left({Left}) Color({Color})";
         }
+        
+        public override void Collect()
+        {
+            base.Collect();
+            
+            Left = 0;
+            Right = 0;
+            Bottom = 0;
+            Top = 0;
+        }
     }
 }

QuestPDF/Elements/Canvas.cs

@@ -7,7 +7,7 @@ namespace QuestPDF.Elements
 {
     public delegate void DrawOnCanvas(SKCanvas canvas, Size availableSpace);
     
-    internal class Canvas : Element, ICacheable, IContent
+    internal class Canvas : Element, ICacheable
     {
         public DrawOnCanvas Handler { get; set; }
         

QuestPDF/Elements/Column.cs

@@ -19,7 +19,7 @@ namespace QuestPDF.Elements
         public Position Offset { get; set; }
     }
     
-    internal class Column : Element, ICacheable, IStateResettable
+    internal class Column : Element, ICacheable, IStateResettable, ICollectable
     {
         internal List<ColumnItem> Items { get; } = new();
         internal float Spacing { get; set; }
@@ -124,5 +124,10 @@ namespace QuestPDF.Elements
             
             return commands;
         }
+
+        public void Collect()
+        {
+            Items.Clear();
+        }
     }
 }

QuestPDF/Elements/Container.cs

@@ -4,7 +4,7 @@ namespace QuestPDF.Elements
 {
     internal class Container : ContainerElement
     {
-        internal Container()
+        public Container()
         {
             
         }

QuestPDF/Elements/Dynamic.cs

@@ -6,7 +6,7 @@ using QuestPDF.Infrastructure;
 
 namespace QuestPDF.Elements
 {
-    internal class DynamicHost : Element, IStateResettable, IContent
+    internal class DynamicHost : Element, IStateResettable
     {
         private DynamicComponentProxy Child { get; }
         private object InitialComponentState { get; set; }

QuestPDF/Elements/DynamicImage.cs

@@ -6,7 +6,7 @@ using SkiaSharp;
 
 namespace QuestPDF.Elements
 {
-    internal class DynamicImage : Element, IContent
+    internal class DynamicImage : Element
     {
         public Func<Size, byte[]>? Source { get; set; }
         

QuestPDF/Elements/Image.cs

@@ -5,7 +5,7 @@ using SkiaSharp;
 
 namespace QuestPDF.Elements
 {
-    internal class Image : Element, ICacheable, IContent
+    internal class Image : Element, ICacheable
     {
         public SKImage? InternalImage { get; set; }
 

QuestPDF/Elements/Line.cs

@@ -15,7 +15,7 @@ namespace QuestPDF.Elements
         Horizontal
     }
     
-    internal class Line : Element, ILine, ICacheable, IContent
+    internal class Line : Element, ILine, ICacheable
     {
         public LineType Type { get; set; } = LineType.Vertical;
         public string Color { get; set; } = Colors.Black;

QuestPDF/Elements/Padding.cs

@@ -4,7 +4,7 @@ using QuestPDF.Infrastructure;
 
 namespace QuestPDF.Elements
 {
-    internal class Padding : ContainerElement, ICacheable
+    internal class Padding : ContainerElement, ICacheable, ICollectable
     {
         public float Top { get; set; }
         public float Right { get; set; }
@@ -62,5 +62,15 @@ namespace QuestPDF.Elements
         {
             return $"Padding: Top({Top}) Right({Right}) Bottom({Bottom}) Left({Left})";
         }
+        
+        public override void Collect()
+        {
+            base.Collect();
+            
+            Left = 0;
+            Right = 0;
+            Bottom = 0;
+            Top = 0;
+        }
     }
 }

QuestPDF/Elements/RepeatContent.cs

@@ -1,9 +0,0 @@
-using QuestPDF.Infrastructure;
-
-namespace QuestPDF.Elements
-{
-    internal class RepeatContent : ContainerElement
-    {
-        public bool Repeat { get; set; }
-    }
-}

QuestPDF/Elements/Row.cs

@@ -31,7 +31,7 @@ namespace QuestPDF.Elements
         public Position Offset { get; set; }
     }
     
-    internal class Row : Element, ICacheable, IStateResettable
+    internal class Row : Element, ICacheable, IStateResettable, ICollectable
     {
         internal List<RowItem> Items { get; } = new();
         internal float Spacing { get; set; }
@@ -156,5 +156,10 @@ namespace QuestPDF.Elements
             
             return renderingCommands;
         }
+
+        public void Collect()
+        {
+            Items.Clear();
+        }
     }
 }

QuestPDF/Elements/Text/FontFallback.cs

@@ -1,150 +0,0 @@
-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

@@ -8,7 +8,7 @@ using QuestPDF.Infrastructure;
 
 namespace QuestPDF.Elements.Text
 {
-    internal class TextBlock : Element, IStateResettable, IContent
+    internal class TextBlock : Element, IStateResettable, ICollectable
     {
         public HorizontalAlignment Alignment { get; set; } = HorizontalAlignment.Left;
         public List<ITextBlockItem> Items { get; set; } = new List<ITextBlockItem>();
@@ -18,11 +18,8 @@ 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;
 
@@ -40,15 +37,11 @@ namespace QuestPDF.Elements.Text
                 foreach (var item in Items)
                     RenderingQueue.Enqueue(item);
             }
-
-            void ApplyFontFallback()
-            {
-                if (FontFallbackApplied)
-                    return;
-
-                Items = Items.ApplyFontFallback().ToList();
-                FontFallbackApplied = true;
-            }
+        }
+        
+        public void Collect()
+        {
+            Items.Clear();
         }
 
         internal override SpacePlan Measure(Size availableSpace)

QuestPDF/Fluent/BorderExtensions.cs

@@ -1,4 +1,5 @@
 using System;
+using QuestPDF.Drawing;
 using QuestPDF.Elements;
 using QuestPDF.Infrastructure;
 
@@ -8,7 +9,7 @@ namespace QuestPDF.Fluent
     {
         private static IContainer Border(this IContainer element, Action<Border> handler)
         {
-            var border = element as Border ?? new Border();
+            var border = element as Border ?? ElementCacheManager.Get<Border>();
             handler(border);
             
             return element.Element(border);

QuestPDF/Fluent/ColumnExtensions.cs

@@ -1,12 +1,14 @@
 using System;
+using QuestPDF.Drawing;
 using QuestPDF.Elements;
 using QuestPDF.Infrastructure;
+using Container = System.ComponentModel.Container;
 
 namespace QuestPDF.Fluent
 {
     public class ColumnDescriptor
     {
-        internal Column Column { get; } = new();
+        internal Column Column { get; set; }
 
         public void Spacing(float value, Unit unit = Unit.Point)
         {
@@ -15,14 +17,9 @@ namespace QuestPDF.Fluent
         
         public IContainer Item()
         {
-            var container = new Container();
-            
-            Column.Items.Add(new ColumnItem
-            {
-                Child = container
-            });
-            
-            return container;
+            var columnItem = ElementCacheManager.Get<ColumnItem>();
+            Column.Items.Add(columnItem);
+            return columnItem;
         }
     }
     
@@ -36,7 +33,8 @@ namespace QuestPDF.Fluent
         
         public static void Column(this IContainer element, Action<ColumnDescriptor> handler)
         {
-            var descriptor = new ColumnDescriptor();
+            var descriptor = ElementCacheManager.Get<ColumnDescriptor>();
+            descriptor.Column = ElementCacheManager.Get<Column>();
             handler(descriptor);
             element.Element(descriptor.Column);
         }

QuestPDF/Fluent/DecorationExtensions.cs

@@ -12,7 +12,7 @@ namespace QuestPDF.Fluent
         {
             var container = new Container();
             Decoration.Before = container;
-            return container.RepeatContent();
+            return container;
         }
         
         public void Before(Action<IContainer> handler)
@@ -36,7 +36,7 @@ namespace QuestPDF.Fluent
         {
             var container = new Container();
             Decoration.After = container;
-            return container.RepeatContent();
+            return container;
         }
         
         public void After(Action<IContainer> handler)

QuestPDF/Fluent/ElementExtensions.cs

@@ -1,4 +1,5 @@
 using System;
+using QuestPDF.Drawing;
 using QuestPDF.Drawing.Exceptions;
 using QuestPDF.Elements;
 using QuestPDF.Infrastructure;
@@ -52,10 +53,10 @@ namespace QuestPDF.Fluent
 
         public static IContainer Background(this IContainer element, string color)
         {
-            return element.Element(new Background
-            {
-                Color = color
-            });
+            var background = ElementCacheManager.Get<Background>();
+            background.Color = color;
+
+            return element.Element(background);
         }
 
         public static void Placeholder(this IContainer element, string? text = null)
@@ -162,7 +163,7 @@ namespace QuestPDF.Fluent
         
         public static IContainer MinimalBox(this IContainer element)
         {
-            return element.Element(new MinimalBox());
+            return element.Element(ElementCacheManager.Get<MinimalBox>());
         }
         
         public static IContainer Unconstrained(this IContainer element)
@@ -195,13 +196,5 @@ namespace QuestPDF.Fluent
         {
             return element.Element(new ScaleToFit());
         }
-        
-        public static IContainer RepeatContent(this IContainer element, bool enabled = true)
-        {
-            return element.Element(new RepeatContent
-            {
-                Repeat = enabled
-            });
-        }
     }
 }

QuestPDF/Fluent/PaddingExtensions.cs

@@ -1,4 +1,5 @@
 using System;
+using QuestPDF.Drawing;
 using QuestPDF.Elements;
 using QuestPDF.Infrastructure;
 
@@ -8,7 +9,7 @@ namespace QuestPDF.Fluent
     { 
         private static IContainer Padding(this IContainer element, Action<Padding> handler)
         {
-            var padding = element as Padding ?? new Padding();
+            var padding = element as Padding ?? ElementCacheManager.Get<Padding>();
             handler(padding);
             
             return element.Element(padding);

QuestPDF/Fluent/RowExtensions.cs

@@ -1,4 +1,5 @@
 using System;
+using QuestPDF.Drawing;
 using QuestPDF.Elements;
 using QuestPDF.Infrastructure;
 
@@ -6,7 +7,7 @@ namespace QuestPDF.Fluent
 {
     public class RowDescriptor
     {
-        internal Row Row { get; } = new();
+        internal Row Row { get; set; } 
 
         public void Spacing(float value)
         {
@@ -15,14 +16,12 @@ namespace QuestPDF.Fluent
 
         private IContainer Item(RowItemType type, float size = 0)
         {
-            var element = new RowItem
-            {
-                Type = type,
-                Size = size
-            };
+            var rowItem = ElementCacheManager.Get<RowItem>();
+            rowItem.Type = type;
+            rowItem.Size = size;
             
-            Row.Items.Add(element);
-            return element;
+            Row.Items.Add(rowItem);
+            return rowItem;
         }
         
         [Obsolete("This element has been renamed since version 2022.2. Please use the RelativeItem method.")]
@@ -57,9 +56,12 @@ namespace QuestPDF.Fluent
     {
         public static void Row(this IContainer element, Action<RowDescriptor> handler)
         {
-            var descriptor = new RowDescriptor();
+            var descriptor = ElementCacheManager.Get<RowDescriptor>();
+            descriptor.Row = ElementCacheManager.Get<Row>();
+            
             handler(descriptor);
             element.Element(descriptor.Row);
+            ElementCacheManager.Store(descriptor);
         }
     }
 }

QuestPDF/Fluent/TextExtensions.cs

@@ -36,7 +36,6 @@ 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

@@ -15,17 +15,6 @@ 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

@@ -4,6 +4,8 @@ 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.")]
@@ -129,7 +131,6 @@ namespace QuestPDF.Fluent
         #endregion
 
         #region Position
-        
         public static TextStyle NormalPosition(this TextStyle style)
         {
             return style.Position(FontPosition.Normal);
@@ -149,21 +150,6 @@ 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/ContainerElement.cs

@@ -5,7 +5,7 @@ using QuestPDF.Elements;
 
 namespace QuestPDF.Infrastructure
 {
-    internal abstract class ContainerElement : Element, IContainer
+    internal abstract class ContainerElement : Element, IContainer, ICollectable
     {
         internal Element? Child { get; set; } = Empty.Instance;
 
@@ -34,5 +34,10 @@ namespace QuestPDF.Infrastructure
         {
             Child?.Draw(availableSpace);
         }
+
+        public virtual void Collect()
+        {
+            Child = default;
+        }
     }
 }

QuestPDF/Infrastructure/ICollectable.cs

@@ -0,0 +1,7 @@
+namespace QuestPDF.Infrastructure
+{
+    public interface ICollectable
+    {
+        void Collect();
+    }
+}

QuestPDF/Infrastructure/IContent.cs

@@ -1,7 +0,0 @@
-namespace QuestPDF.Infrastructure
-{
-    internal interface IContent
-    {
-        
-    }
-}

QuestPDF/Infrastructure/TextStyle.cs

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

QuestPDF/Infrastructure/TextStyleManager.cs

@@ -16,15 +16,13 @@ namespace QuestPDF.Infrastructure
         IsItalic,
         HasStrikethrough,
         HasUnderline,
-        WrapAnywhere,
-        Fallback
+        WrapAnywhere
     }
     
     internal static class TextStyleManager
     {
-        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 ConcurrentDictionary<(TextStyle origin, TextStyleProperty property, object value), TextStyle> TextStyleMutateCache = new();
+        public static ConcurrentDictionary<(TextStyle origin, TextStyle parent, bool overrideValue), TextStyle> TextStyleApplyCache = new();
 
         public static TextStyle Mutate(this TextStyle origin, TextStyleProperty property, object value)
         {
@@ -32,7 +30,7 @@ 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;
@@ -179,69 +177,38 @@ 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);
-            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);
+            var cacheKey = (style, parent, false);
+            return TextStyleApplyCache.GetOrAdd(cacheKey, key => ApplyStyle(key.origin, key.parent, key.overrideValue));
         }
         
         internal static TextStyle OverrideStyle(this TextStyle style, TextStyle parent)
         {
-            var cacheKey = (style, parent);
-            
-            return TextStyleOverrideCache.GetOrAdd(cacheKey, key =>
-            {
-                var result = ApplyStyle(key.origin, key.parent);
-                return MutateStyle(result, TextStyleProperty.Fallback, key.parent.Fallback);
-            });
+            var cacheKey = (style, parent, true);
+            return TextStyleApplyCache.GetOrAdd(cacheKey, key => ApplyStyle(key.origin, key.parent, key.overrideValue));
         }
         
-        private static TextStyle ApplyStyle(this TextStyle style, TextStyle parent, bool overrideStyle = true, bool applyFallback = true)
+        private static TextStyle ApplyStyle(TextStyle style, TextStyle parent, bool overrideValue)
         {
             var result = style;
 
-            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);
+            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);
             
-            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 = 9;
+        private const int RequiredPreviewerVersionMinor = 8;
         
         public PreviewerService(int port)
         {

QuestPDF/QuestPDF.csproj

@@ -3,7 +3,7 @@
         <Authors>MarcinZiabek</Authors>
         <Company>CodeFlint</Company>
         <PackageId>QuestPDF</PackageId>
-        <Version>2022.9.0</Version>
+        <Version>2022.8.2</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

@@ -1,6 +1,20 @@
-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.
+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.

QuestPDF/Settings.cs

@@ -3,7 +3,7 @@
     public static class Settings
     {
         /// <summary>
-        /// This value represents the maximum length of the document that the library produces.
+        /// This value represents the maximum lenght 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 CheckIfAllTextGlyphsAreAvailable { get; set; } = System.Diagnostics.Debugger.IsAttached;
+        public static bool CheckIfAllTextGlyphsAreAvailableInSpecifiedFont { get; set; } = System.Diagnostics.Debugger.IsAttached;
     }
 }

readme.md

@@ -23,8 +23,7 @@ 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/9263853/190931857-8ca52ec8-cc7d-4d12-9467-4442b3342fa1.png" width="700" />
-
+<img src="https://user-images.githubusercontent.com/9263853/184642026-27dd7567-a46a-45d4-9594-e6a70a7193e9.png" width="700" />
 
 ## Please share with the community