Fix Vertical Layout

samples/DrawWithImageSharp/DrawWithImageSharp.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <DebugType>portable</DebugType>
@@ -46,7 +46,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="SixLabors.ImageSharp.Drawing" Version="2.1.3" />
+    <PackageReference Include="SixLabors.ImageSharp.Drawing" Version="2.1.4" />
     <PackageReference Include="System.ValueTuple" Version="4.5.0" />
   </ItemGroup>
 

src/SixLabors.Fonts/FileFontMetrics.cs

@@ -107,6 +107,10 @@ internal override bool TryGetGlyphId(
         out bool skipNextCodePoint)
         => this.fontMetrics.Value.TryGetGlyphId(codePoint, nextCodePoint, out glyphId, out skipNextCodePoint);
 
+    /// <inheritdoc/>
+    internal override bool TryGetCodePoint(ushort glyphId, out CodePoint codePoint)
+        => this.fontMetrics.Value.TryGetCodePoint(glyphId, out codePoint);
+
     /// <inheritdoc/>
     internal override bool TryGetGlyphClass(ushort glyphId, [NotNullWhen(true)] out GlyphClassDef? glyphClass)
         => this.fontMetrics.Value.TryGetGlyphClass(glyphId, out glyphClass);

src/SixLabors.Fonts/FontMetrics.cs

@@ -141,6 +141,19 @@ internal FontMetrics()
     /// </returns>
     internal abstract bool TryGetGlyphId(CodePoint codePoint, CodePoint? nextCodePoint, out ushort glyphId, out bool skipNextCodePoint);
 
+    /// <summary>
+    /// Gets the specified glyph id matching the codepoint.
+    /// </summary>
+    /// <param name="glyphId">The glyph identifier.</param>
+    /// <param name="codePoint">
+    /// When this method returns, contains the codepoint associated with the specified glyph id,
+    /// if the glyph id is found; otherwise, <value>default</value>.
+    /// </param>
+    /// <returns>
+    /// <see langword="true"/> if the face contains a codepoint for the specified glyph id; otherwise, <see langword="false"/>.
+    /// </returns>
+    internal abstract bool TryGetCodePoint(ushort glyphId, out CodePoint codePoint);
+
     /// <summary>
     /// Tries to get the glyph class for a given glyph id.
     /// The font needs to have a GDEF table defined.

src/SixLabors.Fonts/GlyphPositioningCollection.cs

@@ -79,24 +79,48 @@ public void DisableShapingFeature(int index, Tag feature)
     /// </summary>
     /// <param name="offset">The zero-based index within the input codepoint collection.</param>
     /// <param name="pointSize">The font size in PT units of the font containing this glyph.</param>
+    /// <param name="isSubstituted">Whether the glyph is the result of a substitution.</param>
+    /// <param name="isVerticalSubstitution">Whether the glyph is the result of a vertical substitution.</param>
     /// <param name="isDecomposed">Whether the glyph is the result of a decomposition substitution.</param>
     /// <param name="metrics">
     /// When this method returns, contains the glyph metrics associated with the specified offset,
     /// if the value is found; otherwise, the default value for the type of the metrics parameter.
     /// This parameter is passed uninitialized.
     /// </param>
     /// <returns>The metrics.</returns>
-    public bool TryGetGlyphMetricsAtOffset(int offset, out float pointSize, out bool isDecomposed, [NotNullWhen(true)] out IReadOnlyList<GlyphMetrics>? metrics)
+    public bool TryGetGlyphMetricsAtOffset(
+        int offset,
+        out float pointSize,
+        out bool isSubstituted,
+        out bool isVerticalSubstitution,
+        out bool isDecomposed,
+        [NotNullWhen(true)] out IReadOnlyList<GlyphMetrics>? metrics)
     {
         List<GlyphMetrics> match = new();
         pointSize = 0;
+        isSubstituted = false;
+        isVerticalSubstitution = false;
         isDecomposed = false;
+
+        Tag vert = FeatureTags.VerticalAlternates;
+        Tag vrt2 = FeatureTags.VerticalAlternatesAndRotation;
+        Tag vrtr = FeatureTags.VerticalAlternatesForRotation;
+
         for (int i = 0; i < this.glyphs.Count; i++)
         {
             if (this.glyphs[i].Offset == offset)
             {
                 GlyphPositioningData glyph = this.glyphs[i];
+                isSubstituted = glyph.Data.IsSubstituted;
                 isDecomposed = glyph.Data.IsDecomposed;
+
+                foreach (Tag feature in glyph.Data.AppliedFeatures)
+                {
+                    isVerticalSubstitution |= feature == vert;
+                    isVerticalSubstitution |= feature == vrt2;
+                    isVerticalSubstitution |= feature == vrtr;
+                }
+
                 pointSize = glyph.PointSize;
                 match.AddRange(glyph.Metrics);
             }
@@ -147,7 +171,7 @@ public bool TryUpdate(Font font, GlyphSubstitutionCollection collection)
 
                     // Perform a semi-deep clone (FontMetrics is not cloned) so we can continue to
                     // cache the original in the font metrics and only update our collection.
-                    var metrics = new List<GlyphMetrics>(data.Count);
+                    List<GlyphMetrics> metrics = new(data.Count);
                     TextAttributes textAttributes = shape.TextRun.TextAttributes;
                     TextDecorations textDecorations = shape.TextRun.TextDecorations;
                     foreach (GlyphMetrics gm in fontMetrics.GetGlyphMetrics(codePoint, id, textAttributes, textDecorations, layoutMode, colorFontSupport))
@@ -216,6 +240,10 @@ public bool TryAdd(Font font, GlyphSubstitutionCollection collection)
         LayoutMode layoutMode = this.TextOptions.LayoutMode;
         ColorFontSupport colorFontSupport = this.TextOptions.ColorFontSupport;
 
+        Tag vert = FeatureTags.VerticalAlternates;
+        Tag vrt2 = FeatureTags.VerticalAlternatesAndRotation;
+        Tag vrtr = FeatureTags.VerticalAlternatesForRotation;
+
         for (int i = 0; i < collection.Count; i++)
         {
             GlyphShapingData data = collection.GetGlyphShapingData(i, out int offset);
@@ -227,7 +255,14 @@ public bool TryAdd(Font font, GlyphSubstitutionCollection collection)
             // cache the original in the font metrics and only update our collection.
             TextAttributes textAttributes = data.TextRun.TextAttributes;
             TextDecorations textDecorations = data.TextRun.TextDecorations;
-            bool isVerticalLayout = AdvancedTypographicUtils.IsVerticalGlyph(codePoint, layoutMode);
+
+            bool isVertical = AdvancedTypographicUtils.IsVerticalGlyph(codePoint, layoutMode);
+            foreach (Tag feature in data.AppliedFeatures)
+            {
+                isVertical |= feature == vert;
+                isVertical |= feature == vrt2;
+                isVertical |= feature == vrtr;
+            }
 
             foreach (GlyphMetrics gm in fontMetrics.GetGlyphMetrics(codePoint, id, textAttributes, textDecorations, layoutMode, colorFontSupport))
             {
@@ -242,7 +277,7 @@ public bool TryAdd(Font font, GlyphSubstitutionCollection collection)
             if (metrics.Count > 0)
             {
                 GlyphMetrics[] gm = metrics.ToArray();
-                if (isVerticalLayout)
+                if (isVertical)
                 {
                     this.glyphs.Add(new(offset, new(data, true) { Bounds = new(0, 0, 0, gm[0].AdvanceHeight) }, font.Size, gm));
                 }
@@ -302,11 +337,25 @@ public void UpdatePosition(FontMetrics fontMetrics, int index)
     public void Advance(FontMetrics fontMetrics, int index, ushort glyphId, short dx, short dy)
     {
         LayoutMode layoutMode = this.TextOptions.LayoutMode;
-        foreach (GlyphMetrics m in this.glyphs[index].Metrics)
+        Tag vert = FeatureTags.VerticalAlternates;
+        Tag vrt2 = FeatureTags.VerticalAlternatesAndRotation;
+        Tag vrtr = FeatureTags.VerticalAlternatesForRotation;
+
+        GlyphPositioningData glyph = this.glyphs[index];
+        foreach (GlyphMetrics m in glyph.Metrics)
         {
             if (m.GlyphId == glyphId && fontMetrics == m.FontMetrics)
             {
-                m.ApplyAdvance(dx, AdvancedTypographicUtils.IsVerticalGlyph(m.CodePoint, layoutMode) ? dy : (short)0);
+                bool isVertical = AdvancedTypographicUtils.IsVerticalGlyph(m.CodePoint, layoutMode);
+
+                foreach (Tag feature in glyph.Data.AppliedFeatures)
+                {
+                    isVertical |= feature == vert;
+                    isVertical |= feature == vrt2;
+                    isVertical |= feature == vrtr;
+                }
+
+                m.ApplyAdvance(dx, isVertical ? dy : (short)0);
             }
         }
     }

src/SixLabors.Fonts/GlyphShapingData.cs

@@ -37,6 +37,7 @@ public GlyphShapingData(GlyphShapingData data, bool clearFeatures = false)
         this.LigatureComponent = data.LigatureComponent;
         this.MarkAttachment = data.MarkAttachment;
         this.CursiveAttachment = data.CursiveAttachment;
+        this.IsSubstituted = data.IsSubstituted;
         this.IsDecomposed = data.IsDecomposed;
         if (data.UniversalShapingEngineInfo != null)
         {
@@ -57,9 +58,11 @@ public GlyphShapingData(GlyphShapingData data, bool clearFeatures = false)
 
         if (!clearFeatures)
         {
-            this.Features = new(data.Features);
+            this.Features.AddRange(data.Features);
         }
 
+        this.AppliedFeatures.AddRange(data.AppliedFeatures);
+
         this.Bounds = data.Bounds;
     }
 
@@ -116,7 +119,12 @@ public GlyphShapingData(GlyphShapingData data, bool clearFeatures = false)
     /// <summary>
     /// Gets or sets the collection of features.
     /// </summary>
-    public List<TagEntry> Features { get; set; } = new List<TagEntry>();
+    public List<TagEntry> Features { get; set; } = new();
+
+    /// <summary>
+    /// Gets or sets the collection of applied features.
+    /// </summary>
+    public List<Tag> AppliedFeatures { get; set; } = new();
 
     /// <summary>
     /// Gets or sets the shaping bounds.

src/SixLabors.Fonts/GlyphSubstitutionCollection.cs

@@ -225,7 +225,8 @@ public bool TryGetGlyphShapingDataAtOffset(int offset, [NotNullWhen(true)] out I
     /// </summary>
     /// <param name="index">The zero-based index of the element to replace.</param>
     /// <param name="glyphId">The replacement glyph id.</param>
-    public void Replace(int index, ushort glyphId)
+    /// <param name="feature">The feature to apply to the glyph at the specified index.</param>
+    public void Replace(int index, ushort glyphId, Tag feature)
     {
         GlyphShapingData current = this.glyphs[index].Data;
         current.GlyphId = glyphId;
@@ -234,6 +235,7 @@ public void Replace(int index, ushort glyphId)
         current.MarkAttachment = -1;
         current.CursiveAttachment = -1;
         current.IsSubstituted = true;
+        current.AppliedFeatures.Add(feature);
     }
 
     /// <summary>
@@ -243,7 +245,8 @@ public void Replace(int index, ushort glyphId)
     /// <param name="removalIndices">The indices at which to remove elements.</param>
     /// <param name="glyphId">The replacement glyph id.</param>
     /// <param name="ligatureId">The ligature id.</param>
-    public void Replace(int index, ReadOnlySpan<int> removalIndices, ushort glyphId, int ligatureId)
+    /// <param name="feature">The feature to apply to the glyph at the specified index.</param>
+    public void Replace(int index, ReadOnlySpan<int> removalIndices, ushort glyphId, int ligatureId, Tag feature)
     {
         // Remove the glyphs at each index.
         int codePointCount = 0;
@@ -279,6 +282,7 @@ public void Replace(int index, ReadOnlySpan<int> removalIndices, ushort glyphId,
         current.MarkAttachment = -1;
         current.CursiveAttachment = -1;
         current.IsSubstituted = true;
+        current.AppliedFeatures.Add(feature);
     }
 
     /// <summary>
@@ -287,7 +291,8 @@ public void Replace(int index, ReadOnlySpan<int> removalIndices, ushort glyphId,
     /// <param name="index">The zero-based index of the element to replace.</param>
     /// <param name="count">The number of glyphs to remove.</param>
     /// <param name="glyphId">The replacement glyph id.</param>
-    public void Replace(int index, int count, ushort glyphId)
+    /// <param name="feature">The feature to apply to the glyph at the specified index.</param>
+    public void Replace(int index, int count, ushort glyphId, Tag feature)
     {
         // Remove the glyphs at each index.
         int codePointCount = 0;
@@ -322,14 +327,16 @@ public void Replace(int index, int count, ushort glyphId)
         current.MarkAttachment = -1;
         current.CursiveAttachment = -1;
         current.IsSubstituted = true;
+        current.AppliedFeatures.Add(feature);
     }
 
     /// <summary>
     /// Replaces a single glyph id with a collection of glyph ids.
     /// </summary>
     /// <param name="index">The zero-based index of the element to replace.</param>
     /// <param name="glyphIds">The collection of replacement glyph ids.</param>
-    public void Replace(int index, ReadOnlySpan<ushort> glyphIds)
+    /// <param name="feature">The feature to apply to the glyph at the specified index.</param>
+    public void Replace(int index, ReadOnlySpan<ushort> glyphIds, Tag feature)
     {
         if (glyphIds.Length > 0)
         {
@@ -345,7 +352,7 @@ public void Replace(int index, ReadOnlySpan<ushort> glyphIds)
             // Add additional glyphs from the rest of the sequence.
             if (glyphIds.Length > 1)
             {
-                glyphIds = glyphIds.Slice(1);
+                glyphIds = glyphIds[1..];
                 for (int i = 0; i < glyphIds.Length; i++)
                 {
                     GlyphShapingData data = new(current, false)
@@ -354,6 +361,8 @@ public void Replace(int index, ReadOnlySpan<ushort> glyphIds)
                         LigatureComponent = i + 1
                     };
 
+                    data.AppliedFeatures.Add(feature);
+
                     this.glyphs.Insert(++index, new(pair.Offset, data));
                 }
             }

src/SixLabors.Fonts/StreamFontMetrics.cs

@@ -32,6 +32,7 @@ internal partial class StreamFontMetrics : FontMetrics
     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 ConcurrentDictionary<ushort, (bool Success, CodePoint CodePoint)> codePointCache;
     private readonly FontDescription description;
     private readonly HorizontalMetrics horizontalMetrics;
     private readonly VerticalMetrics verticalMetrics;
@@ -61,6 +62,7 @@ internal StreamFontMetrics(TrueTypeFontTables tables)
         this.outlineType = OutlineType.TrueType;
         this.description = new FontDescription(tables.Name, tables.Os2, tables.Head);
         this.glyphIdCache = new();
+        this.codePointCache = new();
         this.glyphCache = new();
         if (tables.Colr is not null)
         {
@@ -82,6 +84,7 @@ internal StreamFontMetrics(CompactFontTables tables)
         this.outlineType = OutlineType.CFF;
         this.description = new FontDescription(tables.Name, tables.Os2, tables.Head);
         this.glyphIdCache = new();
+        this.codePointCache = new();
         this.glyphCache = new();
         if (tables.Colr is not null)
         {
@@ -174,6 +177,26 @@ internal override bool TryGetGlyphId(CodePoint codePoint, CodePoint? nextCodePoi
         return success;
     }
 
+    /// <inheritdoc/>
+    internal override bool TryGetCodePoint(ushort glyphId, out CodePoint codePoint)
+    {
+        CMapTable cmap = this.outlineType == OutlineType.TrueType
+            ? this.trueTypeFontTables!.Cmap
+            : this.compactFontTables!.Cmap;
+
+        (bool success, CodePoint value) = this.codePointCache.GetOrAdd(
+            glyphId,
+            static (glyphId, arg) =>
+            {
+                bool success = arg.TryGetCodePoint(glyphId, out CodePoint codePoint);
+                return (success, codePoint);
+            },
+            cmap);
+
+        codePoint = value;
+        return success;
+    }
+
     /// <inheritdoc/>
     internal override bool TryGetGlyphClass(ushort glyphId, [NotNullWhen(true)] out GlyphClassDef? glyphClass)
     {

src/SixLabors.Fonts/Tables/AdvancedTypographic/GSub/LookupType1SubTable.cs

@@ -74,7 +74,7 @@ public override bool TrySubstitution(
 
         if (this.coverageTable.CoverageIndexOf(glyphId) > -1)
         {
-            collection.Replace(index, (ushort)(glyphId + this.deltaGlyphId));
+            collection.Replace(index, (ushort)(glyphId + this.deltaGlyphId), feature);
             return true;
         }
 
@@ -135,7 +135,7 @@ public override bool TrySubstitution(
 
         if (offset > -1)
         {
-            collection.Replace(index, this.substituteGlyphs[offset]);
+            collection.Replace(index, this.substituteGlyphs[offset], feature);
             return true;
         }
 

src/SixLabors.Fonts/Tables/AdvancedTypographic/GSub/LookupType2SubTable.cs

@@ -98,7 +98,7 @@ public override bool TrySubstitution(
 
         if (offset > -1)
         {
-            collection.Replace(index, this.sequenceTables[offset].SubstituteGlyphs);
+            collection.Replace(index, this.sequenceTables[offset].SubstituteGlyphs, feature);
             return true;
         }
 

src/SixLabors.Fonts/Tables/AdvancedTypographic/GSub/LookupType3SubTable.cs

@@ -100,7 +100,7 @@ public override bool TrySubstitution(
             // TODO: We're just choosing the first alternative here.
             // It looks like the choice is arbitrary and should be determined by
             // the client.
-            collection.Replace(index, this.alternateSetTables[offset].AlternateGlyphs[0]);
+            collection.Replace(index, this.alternateSetTables[offset].AlternateGlyphs[0], feature);
             return true;
         }
 

src/SixLabors.Fonts/Tables/AdvancedTypographic/GSub/LookupType4SubTable.cs

@@ -249,7 +249,7 @@ public override bool TrySubstitution(
             }
 
             // Delete the matched glyphs, and replace the current glyph with the ligature glyph
-            collection.Replace(index, matches, ligatureTable.GlyphId, ligatureId);
+            collection.Replace(index, matches, ligatureTable.GlyphId, ligatureId, feature);
             return true;
         }
 

src/SixLabors.Fonts/Tables/AdvancedTypographic/GSub/LookupType8SubTable.cs

@@ -138,7 +138,7 @@ public override bool TrySubstitution(
         bool hasChanged = false;
         for (int i = 0; i < this.substituteGlyphIds.Length; i++)
         {
-            collection.Replace(index + i, this.substituteGlyphIds[i]);
+            collection.Replace(index + i, this.substituteGlyphIds[i], feature);
             hasChanged = true;
         }