Under annotations

.github/workflows/Nightly.yml

@@ -7,6 +7,7 @@ jobs:
     runs-on: windows-latest
     permissions:
       contents: write
+      packages: write
     steps:
     - name: Update draft on GitHub Releases
       id: release_drafter

CSharpMath.Core.Example/BackEnd/JsonMathTable.cs

@@ -14,7 +14,7 @@ public class JsonMathTable : FontMathTable<TFont, TGlyph> {
     /// typically loaded from a .json file.</summary>
     private readonly JToken _mathTable;
     private readonly JObject _constantsDictionary;
-    private readonly JObject _assemblyTable;
+    private readonly JObject _vAssemblyTable, _hAssemblyTable;
     private readonly JObject _italicTable;
     public TestFontMeasurer FontMeasurer { get; }
     public TestGlyphNameProvider GlyphNameProvider { get; }
@@ -41,7 +41,8 @@ JObject GetTable(string name) =>
       GlyphBoundsProvider = glyphBoundsProvider;
       _mathTable = mathTable;
       _constantsDictionary = GetTable("constants");
-      _assemblyTable = GetTable("v_assembly");
+      _vAssemblyTable = GetTable("v_assembly");
+      _hAssemblyTable = GetTable("h_assembly");
       _italicTable = GetTable("italic");
     }
     // different from _ConstantFromTable in that the _ConstantFromTable requires
@@ -137,7 +138,18 @@ public override float RadicalExtraAscender(TFont font) =>
     private const string _extenderKey = "extender";
     private const string _glyphKey = "glyph";
     public override IEnumerable<GlyphPart<TGlyph>>? GetVerticalGlyphAssembly(TGlyph rawGlyph, TFont font) =>
-      _assemblyTable[GlyphNameProvider.GetGlyphName(rawGlyph)]?[_assemblyPartsKey] is JArray parts
+      _vAssemblyTable[GlyphNameProvider.GetGlyphName(rawGlyph)]?[_assemblyPartsKey] is JArray parts
+      ? parts.Select(partInfo =>
+        new GlyphPart<TGlyph>(
+          GlyphNameProvider.GetGlyph(partInfo[_glyphKey]!.Value<string>()!),
+          FontUnitsToPt(font, partInfo[_advanceKey]!.Value<int>()),
+          FontUnitsToPt(font, partInfo[_startConnectorKey]!.Value<int>()),
+          FontUnitsToPt(font, partInfo[_endConnectorKey]!.Value<int>()),
+          partInfo[_extenderKey]!.Value<bool>()))
+      // Should have been defined, but let's return null
+      : null;
+    public override IEnumerable<GlyphPart<TGlyph>>? GetHorizontalGlyphAssembly(TGlyph rawGlyph, TFont font) =>
+      _hAssemblyTable[GlyphNameProvider.GetGlyphName(rawGlyph)]?[_assemblyPartsKey] is JArray parts
       ? parts.Select(partInfo =>
         new GlyphPart<TGlyph>(
           GlyphNameProvider.GetGlyph(partInfo[_glyphKey]!.Value<string>()!),

CSharpMath.Core.Example/CSharpMath.Core.Example.csproj

@@ -5,8 +5,9 @@
     <StartupObject>CSharpMath.Core.Checker</StartupObject>
   </PropertyGroup>
   <ItemGroup>
-	<ProjectReference Include="..\CSharpMath\CSharpMath.csproj" />
-	<PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
-	<EmbeddedResource Include="Resources\latinmodern-math.json" />
+    <ProjectReference Include="..\CSharpMath\CSharpMath.csproj" />
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
+    <EmbeddedResource Include="Resources\latinmodern-math.json" />
+    <None Include="Resources\MathTableExport.py" />
   </ItemGroup>
 </Project>

CSharpMath.Core.Example/Resources/MathTableExport.py

@@ -0,0 +1,216 @@
+# Based on https://github.com/kostub/iosMath/blob/master/fonts/math_table_to_plist.py
+# Added: get_h_assembly (version 1.3 -> 1.4)
+
+import sys
+import json
+from fontTools.ttLib import TTFont
+
+def process_font(font_file, out_file):
+    font = TTFont(font_file)
+    math_table = font['MATH'].table
+    constants = get_constants(math_table)
+    italic_c = get_italic_correction(math_table)
+    v_variants = get_v_variants(math_table)
+    h_variants = get_h_variants(math_table)
+    v_assembly = get_v_assembly(math_table)
+    h_assembly = get_h_assembly(math_table)
+    accents = get_accent_attachments(math_table)
+    pl = {
+            "version" : "1.4",
+            "constants": constants,
+            "v_variants" : v_variants,
+            "h_variants" : h_variants,
+            "italic" : italic_c,
+            "accents" : accents,
+            "v_assembly" : v_assembly,
+            "h_assembly" : h_assembly }
+    ofile = open(out_file, 'w')
+    json.dump(pl, ofile)
+    ofile.close()
+
+def get_constants(math_table):
+    constants = math_table.MathConstants
+    if constants is None:
+        raise 'Cannot find MathConstants in MATH table'
+
+    int_consts = [ 'ScriptPercentScaleDown',
+            'ScriptScriptPercentScaleDown',
+            'DelimitedSubFormulaMinHeight',
+            'DisplayOperatorMinHeight',
+            'RadicalDegreeBottomRaisePercent']
+    consts = { c : getattr(constants, c) for c in int_consts }
+
+    record_consts = [ 'MathLeading',
+            'AxisHeight',
+            'AccentBaseHeight',
+            'FlattenedAccentBaseHeight',
+            'SubscriptShiftDown',
+            'SubscriptTopMax',
+            'SubscriptBaselineDropMin',
+            'SuperscriptShiftUp',
+            'SuperscriptShiftUpCramped',
+            'SuperscriptBottomMin',
+            'SuperscriptBaselineDropMax',
+            'SubSuperscriptGapMin',
+            'SuperscriptBottomMaxWithSubscript',
+            'SpaceAfterScript',
+            'UpperLimitGapMin',
+            'UpperLimitBaselineRiseMin',
+            'LowerLimitGapMin',
+            'LowerLimitBaselineDropMin',
+            'StackTopShiftUp',
+            'StackTopDisplayStyleShiftUp',
+            'StackBottomShiftDown',
+            'StackBottomDisplayStyleShiftDown',
+            'StackGapMin',
+            'StackDisplayStyleGapMin',
+            'StretchStackTopShiftUp',
+            'StretchStackBottomShiftDown',
+            'StretchStackGapAboveMin',
+            'StretchStackGapBelowMin',
+            'FractionNumeratorShiftUp',
+            'FractionNumeratorDisplayStyleShiftUp',
+            'FractionDenominatorShiftDown',
+            'FractionDenominatorDisplayStyleShiftDown',
+            'FractionNumeratorGapMin',
+            'FractionNumDisplayStyleGapMin',
+            'FractionRuleThickness',
+            'FractionDenominatorGapMin',
+            'FractionDenomDisplayStyleGapMin',
+            'SkewedFractionHorizontalGap',
+            'SkewedFractionVerticalGap',
+            'OverbarVerticalGap',
+            'OverbarRuleThickness',
+            'OverbarExtraAscender',
+            'UnderbarVerticalGap',
+            'UnderbarRuleThickness',
+            'UnderbarExtraDescender',
+            'RadicalVerticalGap',
+            'RadicalDisplayStyleVerticalGap',
+            'RadicalRuleThickness',
+            'RadicalExtraAscender',
+            'RadicalKernBeforeDegree',
+            'RadicalKernAfterDegree',
+    ]
+    consts_2 = { c : getattr(constants, c).Value for c in record_consts }
+    consts.update(consts_2)
+
+    variants = math_table.MathVariants
+    consts['MinConnectorOverlap'] = variants.MinConnectorOverlap
+    return consts
+
+def get_italic_correction(math_table):
+    glyph_info = math_table.MathGlyphInfo
+    if glyph_info is None:
+        raise "Cannot find MathGlyphInfo in MATH table."
+    italic = glyph_info.MathItalicsCorrectionInfo
+    if italic is None:
+        raise "Cannot find Italic Correction in GlyphInfo"
+
+    glyphs = italic.Coverage.glyphs
+    count = italic.ItalicsCorrectionCount
+    records = italic.ItalicsCorrection
+    italic_dict = {}
+    for i in range(count):
+        name = glyphs[i]
+        record = records[i]
+        if record.DeviceTable is not None:
+            raise "Don't know how to process device table for italic correction."
+        italic_dict[name] = record.Value
+    return italic_dict
+
+def get_accent_attachments(math_table):
+    glyph_info = math_table.MathGlyphInfo
+    if glyph_info is None:
+        raise "Cannot find MathGlyphInfo in MATH table."
+    attach = glyph_info.MathTopAccentAttachment
+    if attach is None:
+        raise "Cannot find Top Accent Attachment in GlyphInfo"
+
+    glyphs = attach.TopAccentCoverage.glyphs
+    count = attach.TopAccentAttachmentCount
+    records = attach.TopAccentAttachment
+    attach_dict = {}
+    for i in range(count):
+        name = glyphs[i]
+        record = records[i]
+        if record.DeviceTable is not None:
+            raise "Don't know how to process device table for accent attachment."
+        attach_dict[name] = record.Value
+    return attach_dict
+
+def get_v_variants(math_table):
+    variants = math_table.MathVariants
+    vglyphs = variants.VertGlyphCoverage.glyphs
+    vconstruction = variants.VertGlyphConstruction
+    count = variants.VertGlyphCount
+    variant_dict = {}
+    for i in range(count):
+        name = vglyphs[i]
+        record = vconstruction[i]
+        glyph_variants = [x.VariantGlyph for x in
+                record.MathGlyphVariantRecord]
+        variant_dict[name] = glyph_variants
+    return variant_dict
+
+def get_h_variants(math_table):
+    variants = math_table.MathVariants
+    hglyphs = variants.HorizGlyphCoverage.glyphs
+    hconstruction = variants.HorizGlyphConstruction
+    count = variants.HorizGlyphCount
+    variant_dict = {}
+    for i in range(count):
+        name = hglyphs[i]
+        record = hconstruction[i]
+        glyph_variants = [x.VariantGlyph for x in
+                record.MathGlyphVariantRecord]
+        variant_dict[name] = glyph_variants
+    return variant_dict
+
+def get_v_assembly(math_table):
+    variants = math_table.MathVariants
+    vglyphs = variants.VertGlyphCoverage.glyphs
+    vconstruction = variants.VertGlyphConstruction
+    count = variants.VertGlyphCount
+    assembly_dict = {}
+    for i in range(count):
+        name = vglyphs[i]
+        record = vconstruction[i]
+        assembly = record.GlyphAssembly
+        if assembly is not None:
+            # There is an assembly for this glyph
+            italic = assembly.ItalicsCorrection.Value
+            parts = [part_dict(part) for part in assembly.PartRecords]
+            assembly_dict[name] = {
+                    "italic" : assembly.ItalicsCorrection.Value,
+                    "parts" : parts }
+    return assembly_dict
+
+def get_h_assembly(math_table):
+    variants = math_table.MathVariants
+    hglyphs = variants.HorizGlyphCoverage.glyphs
+    hconstruction = variants.HorizGlyphConstruction
+    count = variants.HorizGlyphCount
+    assembly_dict = {}
+    for i in range(count):
+        name = hglyphs[i]
+        record = hconstruction[i]
+        assembly = record.GlyphAssembly
+        if assembly is not None:
+            # There is an assembly for this glyph
+            italic = assembly.ItalicsCorrection.Value
+            parts = [part_dict(part) for part in assembly.PartRecords]
+            assembly_dict[name] = {
+                    "italic" : assembly.ItalicsCorrection.Value,
+                    "parts" : parts }
+    return assembly_dict
+
+def part_dict(part):
+    return {
+            "glyph": part.glyph,
+            "startConnector" : part.StartConnectorLength,
+            "endConnector" : part.EndConnectorLength,
+            "advance" : part.FullAdvance,
+            "extender" : (part.PartFlags == 1) }
+
+process_font('../../CSharpMath.Rendering/Reference Fonts/latinmodern-math.otf', 'latinmodern-math.json')