Optimize low hanging fruit

src/SixLabors.Fonts/FileFontMetrics.cs

@@ -33,7 +33,7 @@ internal FileFontMetrics(FontDescription description, string path, long offset)
     {
         this.Description = description;
         this.Path = path;
-        this.fontMetrics = new Lazy<StreamFontMetrics>(() => StreamFontMetrics.LoadFont(path, offset));
+        this.fontMetrics = new Lazy<StreamFontMetrics>(() => StreamFontMetrics.LoadFont(path, offset), true);
     }
 
     /// <inheritdoc cref="FontMetrics.Description"/>

src/SixLabors.Fonts/Font.cs

@@ -42,8 +42,8 @@ public Font(FontFamily family, float size, FontStyle style)
         this.Family = family;
         this.RequestedStyle = style;
         this.Size = size;
-        this.metrics = new Lazy<FontMetrics?>(this.LoadInstanceInternal);
-        this.fontName = new Lazy<string>(this.LoadFontName);
+        this.metrics = new Lazy<FontMetrics?>(this.LoadInstanceInternal, true);
+        this.fontName = new Lazy<string>(this.LoadFontName, true);
     }
 
     /// <summary>
@@ -95,6 +95,7 @@ public Font(Font prototype, float size)
     /// <summary>
     /// Gets the font metrics.
     /// </summary>
+    /// <exception cref="FontException">Font instance not found.</exception>
     public FontMetrics FontMetrics => this.metrics.Value ?? throw new FontException("Font instance not found.");
 
     /// <summary>
@@ -194,7 +195,7 @@ public bool TryGetGlyphs(
     /// </summary>
     /// <param name="codePoint">The code point of the character.</param>
     /// <param name="textAttributes">The text attributes to apply to the glyphs.</param>
-    /// <param name="layoutMode">The layout mode to apply to thte glyphs.</param>
+    /// <param name="layoutMode">The layout mode to apply to the glyphs.</param>
     /// <param name="support">Options for enabling color font support during layout and rendering.</param>
     /// <param name="glyphs">
     /// When this method returns, contains the glyphs for the given codepoint, attributes, and color support if the glyphs
@@ -217,7 +218,7 @@ public bool TryGetGlyphs(
     /// <param name="codePoint">The code point of the character.</param>
     /// <param name="textAttributes">The text attributes to apply to the glyphs.</param>
     /// <param name="textDecorations">The text decorations to apply to the glyphs.</param>
-    /// <param name="layoutMode">The layout mode to apply to thte glyphs.</param>
+    /// <param name="layoutMode">The layout mode to apply to the glyphs.</param>
     /// <param name="support">Options for enabling color font support during layout and rendering.</param>
     /// <param name="glyphs">
     /// When this method returns, contains the glyphs for the given codepoint, attributes, and color support if the glyphs

src/SixLabors.Fonts/StreamFontMetrics.Cff.cs

@@ -66,7 +66,7 @@ private static StreamFontMetrics LoadCompactFont(FontReader reader)
     }
 
     private GlyphMetrics CreateCffGlyphMetrics(
-        CodePoint codePoint,
+        in CodePoint codePoint,
         ushort glyphId,
         GlyphType glyphType,
         TextAttributes textAttributes,

src/SixLabors.Fonts/StreamFontMetrics.TrueType.cs

@@ -115,7 +115,7 @@ private static StreamFontMetrics LoadTrueTypeFont(FontReader reader)
     }
 
     private GlyphMetrics CreateTrueTypeGlyphMetrics(
-        CodePoint codePoint,
+        in CodePoint codePoint,
         ushort glyphId,
         GlyphType glyphType,
         TextAttributes textAttributes,

src/SixLabors.Fonts/StreamFontMetrics.cs

@@ -31,6 +31,7 @@ internal partial class StreamFontMetrics : FontMetrics
     // https://docs.microsoft.com/en-us/typography/opentype/spec/otff#font-tables
     private readonly ConcurrentDictionary<(int CodePoint, ushort Id, TextAttributes Attributes, bool IsVerticalLayout), GlyphMetrics[]> glyphCache;
     private readonly ConcurrentDictionary<(int CodePoint, ushort Id, TextAttributes Attributes, bool IsVerticalLayout), GlyphMetrics[]>? colorGlyphCache;
+    private readonly ConcurrentDictionary<(int CodePoint, int NextCodePoint), (bool Success, ushort GlyphId, bool SkipNextCodePoint)> glyphIdCache;
     private readonly FontDescription description;
     private readonly HorizontalMetrics horizontalMetrics;
     private readonly VerticalMetrics verticalMetrics;
@@ -59,6 +60,7 @@ internal StreamFontMetrics(TrueTypeFontTables tables)
         this.trueTypeFontTables = tables;
         this.outlineType = OutlineType.TrueType;
         this.description = new FontDescription(tables.Name, tables.Os2, tables.Head);
+        this.glyphIdCache = new();
         this.glyphCache = new();
         if (tables.Colr is not null)
         {
@@ -79,6 +81,7 @@ internal StreamFontMetrics(CompactFontTables tables)
         this.compactFontTables = tables;
         this.outlineType = OutlineType.CFF;
         this.description = new FontDescription(tables.Name, tables.Os2, tables.Head);
+        this.glyphIdCache = new();
         this.glyphCache = new();
         if (tables.Colr is not null)
         {
@@ -157,7 +160,18 @@ internal override bool TryGetGlyphId(CodePoint codePoint, CodePoint? nextCodePoi
             ? this.trueTypeFontTables!.Cmap
             : this.compactFontTables!.Cmap;
 
-        return cmap.TryGetGlyphId(codePoint, nextCodePoint, out glyphId, out skipNextCodePoint);
+        (bool success, ushort id, bool skip) = this.glyphIdCache.GetOrAdd(
+                       (codePoint.Value, nextCodePoint?.Value ?? -1),
+                       static (_, arg) =>
+                       {
+                           bool success = arg.cmap.TryGetGlyphId(arg.codePoint, arg.nextCodePoint, out ushort id, out bool skip);
+                           return (success, id, skip);
+                       },
+                       (cmap, codePoint, nextCodePoint));
+
+        glyphId = id;
+        skipNextCodePoint = skip;
+        return success;
     }
 
     /// <inheritdoc/>
@@ -206,14 +220,6 @@ internal override IReadOnlyList<GlyphMetrics> GetGlyphMetrics(
         LayoutMode layoutMode,
         ColorFontSupport support)
     {
-        GlyphType glyphType = GlyphType.Standard;
-        if (glyphId == 0)
-        {
-            // A glyph was not found in this face for the previously matched
-            // codepoint. Set to fallback.
-            glyphType = GlyphType.Fallback;
-        }
-
         if (support == ColorFontSupport.MicrosoftColrFormat
             && this.TryGetColoredMetrics(codePoint, glyphId, textAttributes, textDecorations, layoutMode, out GlyphMetrics[]? metrics))
         {
@@ -222,17 +228,18 @@ internal override IReadOnlyList<GlyphMetrics> GetGlyphMetrics(
 
         // We overwrite the cache entry for this type should the attributes change.
         return this.glyphCache.GetOrAdd(
-              CreateCacheKey(codePoint, glyphId, textAttributes, layoutMode),
-              key => new[]
-              {
-                this.CreateGlyphMetrics(
-                codePoint,
-                key.Id,
-                glyphType,
-                key.Attributes,
-                textDecorations,
-                key.IsVerticalLayout)
-              });
+            CreateCacheKey(in codePoint, glyphId, textAttributes, layoutMode),
+            static (key, arg) => new[]
+            {
+                arg.Item3.CreateGlyphMetrics(
+                    in arg.codePoint,
+                    key.Id,
+                    key.Id == 0 ? GlyphType.Fallback : GlyphType.Standard,
+                    key.Attributes,
+                    arg.textDecorations,
+                    key.IsVerticalLayout)
+            },
+            (textDecorations, codePoint, this));
     }
 
     /// <inheritdoc />
@@ -530,7 +537,7 @@ public static StreamFontMetrics[] LoadFontCollection(Stream stream)
     }
 
     private static (int CodePoint, ushort Id, TextAttributes Attributes, bool IsVerticalLayout) CreateCacheKey(
-        CodePoint codePoint,
+        in CodePoint codePoint,
         ushort glyphId,
         TextAttributes textAttributes,
         LayoutMode layoutMode)
@@ -555,28 +562,31 @@ private bool TryGetColoredMetrics(
         }
 
         // We overwrite the cache entry for this type should the attributes change.
-        metrics = this.colorGlyphCache.GetOrAdd(CreateCacheKey(codePoint, glyphId, textAttributes, layoutMode), key =>
-        {
-            GlyphMetrics[] m = Array.Empty<GlyphMetrics>();
-            Span<LayerRecord> indexes = colr.GetLayers(key.Id);
-            if (indexes.Length > 0)
+        metrics = this.colorGlyphCache.GetOrAdd(
+            CreateCacheKey(in codePoint, glyphId, textAttributes, layoutMode),
+            (key, args) =>
             {
-                m = new GlyphMetrics[indexes.Length];
-                for (int i = 0; i < indexes.Length; i++)
+                GlyphMetrics[] m = Array.Empty<GlyphMetrics>();
+                Span<LayerRecord> indexes = colr.GetLayers(key.Id);
+                if (indexes.Length > 0)
                 {
-                    LayerRecord layer = indexes[i];
-                    m[i] = this.CreateGlyphMetrics(codePoint, layer.GlyphId, GlyphType.ColrLayer, key.Attributes, textDecorations, key.IsVerticalLayout, layer.PaletteIndex);
+                    m = new GlyphMetrics[indexes.Length];
+                    for (int i = 0; i < indexes.Length; i++)
+                    {
+                        LayerRecord layer = indexes[i];
+                        m[i] = args.Item2.CreateGlyphMetrics(in args.codePoint, layer.GlyphId, GlyphType.ColrLayer, key.Attributes, textDecorations, key.IsVerticalLayout, layer.PaletteIndex);
+                    }
                 }
-            }
 
-            return m;
-        });
+                return m;
+            },
+            (codePoint, this));
 
         return metrics.Length > 0;
     }
 
     private GlyphMetrics CreateGlyphMetrics(
-        CodePoint codePoint,
+        in CodePoint codePoint,
         ushort glyphId,
         GlyphType glyphType,
         TextAttributes textAttributes,
@@ -585,8 +595,8 @@ private GlyphMetrics CreateGlyphMetrics(
         ushort paletteIndex = 0)
         => this.outlineType switch
         {
-            OutlineType.TrueType => this.CreateTrueTypeGlyphMetrics(codePoint, glyphId, glyphType, textAttributes, textDecorations, isVerticalLayout, paletteIndex),
-            OutlineType.CFF => this.CreateCffGlyphMetrics(codePoint, glyphId, glyphType, textAttributes, textDecorations, isVerticalLayout, paletteIndex),
+            OutlineType.TrueType => this.CreateTrueTypeGlyphMetrics(in codePoint, glyphId, glyphType, textAttributes, textDecorations, isVerticalLayout, paletteIndex),
+            OutlineType.CFF => this.CreateCffGlyphMetrics(in codePoint, glyphId, glyphType, textAttributes, textDecorations, isVerticalLayout, paletteIndex),
             _ => throw new NotSupportedException(),
         };
 }

src/SixLabors.Fonts/SystemFonts.cs

@@ -10,7 +10,7 @@ namespace SixLabors.Fonts;
 /// </summary>
 public static class SystemFonts
 {
-    private static readonly Lazy<SystemFontCollection> LazySystemFonts = new(() => new SystemFontCollection());
+    private static readonly Lazy<SystemFontCollection> LazySystemFonts = new(() => new SystemFontCollection(), true);
 
     /// <summary>
     /// Gets the collection containing the globally installed system fonts.

src/SixLabors.Fonts/Tables/AdvancedTypographic/UnicodeScriptTagMap.cs

@@ -11,7 +11,7 @@ namespace SixLabors.Fonts.Tables.AdvancedTypographic;
 /// </summary>
 internal sealed class UnicodeScriptTagMap : Dictionary<ScriptClass, Tag[]>
 {
-    private static readonly Lazy<UnicodeScriptTagMap> Lazy = new(() => CreateMap());
+    private static readonly Lazy<UnicodeScriptTagMap> Lazy = new(() => CreateMap(), true);
 
     /// <summary>
     /// Prevents a default instance of the <see cref="UnicodeScriptTagMap"/> class from being created.

src/SixLabors.Fonts/Tables/Cff/CffGlyphMetrics.cs

@@ -11,7 +11,6 @@ namespace SixLabors.Fonts.Tables.Cff;
 /// </summary>
 internal class CffGlyphMetrics : GlyphMetrics
 {
-    private static readonly Vector2 YInverter = new(1, -1);
     private CffGlyphData glyphData;
 
     internal CffGlyphMetrics(

src/SixLabors.Fonts/Tables/Cff/CffOperator.cs

@@ -5,7 +5,7 @@ namespace SixLabors.Fonts.Tables.Cff;
 
 internal sealed class CFFOperator
 {
-    private static readonly Lazy<Dictionary<int, CFFOperator>> RegisteredOperators = new(() => CreateDictionary());
+    private static readonly Lazy<Dictionary<int, CFFOperator>> RegisteredOperators = new(() => CreateDictionary(), true);
     private readonly byte b0;
     private readonly byte b1;
     private readonly OperatorOperandKind operatorOperandKind;

src/SixLabors.Fonts/TextLayout.cs

@@ -1066,7 +1066,7 @@ private static TextBox BreakLines(
                     else if (shouldWrap && lineAdvance + glyphAdvance >= wrappingLength)
                     {
                         // Forced wordbreak
-                        if (breakAll)
+                        if (breakAll && textLine.Count > 0)
                         {
                             textLines.Add(textLine.Finalize());
                             glyphCount += textLine.Count;
@@ -1086,7 +1086,7 @@ private static TextBox BreakLines(
                                     lineAdvance = split.ScaledLineAdvance;
                                 }
                             }
-                            else
+                            else if (textLine.Count > 0)
                             {
                                 textLines.Add(textLine.Finalize());
                                 glyphCount += textLine.Count;
@@ -1123,15 +1123,15 @@ private static TextBox BreakLines(
                                 textLine = split;
                                 lineAdvance = split.ScaledLineAdvance;
                             }
-                            else if (breakWord)
+                            else if (breakWord && textLine.Count > 0)
                             {
                                 textLines.Add(textLine.Finalize());
                                 glyphCount += textLine.Count;
                                 textLine = new();
                                 lineAdvance = 0;
                             }
                         }
-                        else if (breakWord)
+                        else if (breakWord && textLine.Count > 0)
                         {
                             textLines.Add(textLine.Finalize());
                             glyphCount += textLine.Count;
@@ -1335,10 +1335,24 @@ public TextLine SplitAt(LineBreak lineBreak, bool keepAll)
             // Create a new line ensuring we capture the initial metrics.
             TextLine result = new();
             result.data.AddRange(this.data.GetRange(index, this.data.Count - index));
-            result.ScaledLineAdvance = result.data.Sum(x => x.ScaledAdvance);
-            result.ScaledMaxAscender = result.data.Max(x => x.ScaledAscender);
-            result.ScaledMaxDescender = result.data.Max(x => x.ScaledDescender);
-            result.ScaledMaxLineHeight = result.data.Max(x => x.ScaledLineHeight);
+
+            float advance = 0;
+            float ascender = 0;
+            float descender = 0;
+            float lineHeight = 0;
+            for (int i = 0; i < result.data.Count; i++)
+            {
+                GlyphLayoutData glyph = result.data[i];
+                advance += glyph.ScaledAdvance;
+                ascender = MathF.Max(ascender, glyph.ScaledAscender);
+                descender = MathF.Max(descender, glyph.ScaledDescender);
+                lineHeight = MathF.Max(lineHeight, glyph.ScaledLineHeight);
+            }
+
+            result.ScaledLineAdvance = advance;
+            result.ScaledMaxAscender = ascender;
+            result.ScaledMaxDescender = descender;
+            result.ScaledMaxLineHeight = lineHeight;
 
             // Remove those items from this line.
             this.data.RemoveRange(index, this.data.Count - index);
@@ -1361,10 +1375,23 @@ public TextLine SplitAt(LineBreak lineBreak, bool keepAll)
             }
 
             // Lastly recalculate this line metrics.
-            this.ScaledLineAdvance = this.data.Sum(x => x.ScaledAdvance);
-            this.ScaledMaxAscender = this.data.Max(x => x.ScaledAscender);
-            this.ScaledMaxDescender = this.data.Max(x => x.ScaledDescender);
-            this.ScaledMaxLineHeight = this.data.Max(x => x.ScaledLineHeight);
+            advance = 0;
+            ascender = 0;
+            descender = 0;
+            lineHeight = 0;
+            for (int i = 0; i < this.data.Count; i++)
+            {
+                GlyphLayoutData glyph = this.data[i];
+                advance += glyph.ScaledAdvance;
+                ascender = MathF.Max(ascender, glyph.ScaledAscender);
+                descender = MathF.Max(descender, glyph.ScaledDescender);
+                lineHeight = MathF.Max(lineHeight, glyph.ScaledLineHeight);
+            }
+
+            this.ScaledLineAdvance = advance;
+            this.ScaledMaxAscender = ascender;
+            this.ScaledMaxDescender = descender;
+            this.ScaledMaxLineHeight = lineHeight;
 
             return result;
         }

src/SixLabors.Fonts/Unicode/UnicodeData.cs

@@ -9,18 +9,18 @@ namespace SixLabors.Fonts.Unicode;
 
 internal static class UnicodeData
 {
-    private static readonly Lazy<UnicodeTrie> LazyBidiTrie = new(() => GetBidiTrie());
-    private static readonly Lazy<UnicodeTrie> LazyBidiMirrorTrie = new(() => GetBidiMirrorTrie());
-    private static readonly Lazy<UnicodeTrie> LazyGraphemeTrie = new(() => GetGraphemeTrie());
-    private static readonly Lazy<UnicodeTrie> LazyLineBreakTrie = new(() => GetLineBreakTrie());
-    private static readonly Lazy<UnicodeTrie> LazyScriptTrie = new(() => GetScriptTrie());
-    private static readonly Lazy<UnicodeTrie> LazyCategoryTrie = new(() => GetCategoryTrie());
-    private static readonly Lazy<UnicodeTrie> LazyArabicShapingTrie = new(() => GetArabicShapingTrie());
-    private static readonly Lazy<UnicodeTrie> LazyIndicSyllabicCategoryTrie = new(() => GetIndicSyllabicCategoryTrie());
-    private static readonly Lazy<UnicodeTrie> LazyIndicPositionalCategoryTrie = new(() => GetIndicPositionalCategoryTrie());
-    private static readonly Lazy<UnicodeTrie> LazyVerticalOrientationTrie = new(() => GetVerticalOrientationTrie());
-    private static readonly Lazy<UnicodeTrie> LazyUniversalShapingTrie = new(() => GetUniversalShapingTrie());
-    private static readonly Lazy<UnicodeTrie> LazyIndicShapingTrie = new(() => GetIndicShapingTrie());
+    private static readonly Lazy<UnicodeTrie> LazyBidiTrie = new(() => GetBidiTrie(), true);
+    private static readonly Lazy<UnicodeTrie> LazyBidiMirrorTrie = new(() => GetBidiMirrorTrie(), true);
+    private static readonly Lazy<UnicodeTrie> LazyGraphemeTrie = new(() => GetGraphemeTrie(), true);
+    private static readonly Lazy<UnicodeTrie> LazyLineBreakTrie = new(() => GetLineBreakTrie(), true);
+    private static readonly Lazy<UnicodeTrie> LazyScriptTrie = new(() => GetScriptTrie(), true);
+    private static readonly Lazy<UnicodeTrie> LazyCategoryTrie = new(() => GetCategoryTrie(), true);
+    private static readonly Lazy<UnicodeTrie> LazyArabicShapingTrie = new(() => GetArabicShapingTrie(), true);
+    private static readonly Lazy<UnicodeTrie> LazyIndicSyllabicCategoryTrie = new(() => GetIndicSyllabicCategoryTrie(), true);
+    private static readonly Lazy<UnicodeTrie> LazyIndicPositionalCategoryTrie = new(() => GetIndicPositionalCategoryTrie(), true);
+    private static readonly Lazy<UnicodeTrie> LazyVerticalOrientationTrie = new(() => GetVerticalOrientationTrie(), true);
+    private static readonly Lazy<UnicodeTrie> LazyUniversalShapingTrie = new(() => GetUniversalShapingTrie(), true);
+    private static readonly Lazy<UnicodeTrie> LazyIndicShapingTrie = new(() => GetIndicShapingTrie(), true);
 
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static uint GetBidiData(uint codePoint) => LazyBidiTrie.Value.Get(codePoint);