PascalType2/Test/TestKernFormat2.pas at master · andersmelander/PascalType2 · GitHub

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unit TestKernFormat2;

interface

uses
  TestFramework,
  PascalType.Types,
  PascalType.Classes,
  PascalType.FontFace.SFNT,
  PascalType.Shaper,
  PascalType.GlyphString,
  PascalType.Unicode;

type
  TTestKernFormat2 = class(TTestCase)
  private
    FFontFace: TPascalTypeFontFace;
  public
    procedure SetUp; override;
    procedure TearDown; override;
  published
    procedure TestKernAV;
    procedure TestKernAlphabet;
  end;

implementation

uses
  System.SysUtils,
  System.IOUtils;

{ TTestKernFormat2 }

procedure TTestKernFormat2.SetUp;
begin
  inherited;
  FFontFace := TPascalTypeFontFace.Create;
  var FontPath := TPath.Combine(ExtractFilePath(ParamStr(0)), '..\Data\in-house\fonts\e39391c77a6321c2ac7a2d644de0396470cd4bfe.ttf');
  if not TFile.Exists(FontPath) then
    Fail('Font file not found: ' + FontPath);
  FFontFace.LoadFromFile(FontPath);
end;

procedure TTestKernFormat2.TearDown;
begin
  FFontFace.Free;
  inherited;
end;

procedure TTestKernFormat2.TestKernAV;
var
  Shaper: TPascalTypeShaper;
  Glyphs: TPascalTypeGlyphString;
  CodePoints: TPascalTypeCodePoints;
begin
  SetLength(CodePoints, 2);
  CodePoints[0] := $0041; // A
  CodePoints[1] := $0056; // V

  Shaper := TPascalTypeShaper.CreateShaper(FFontFace, 'latn');
  try
    Shaper.UserFeatures^['kern'] := True;
    Glyphs := Shaper.TextToGlyphs(CodePoints);
    try
      Shaper.Shape(Glyphs);

      // Harfbuzz expected: [A=0+701|V=1@-40,0+703]
      // A (GID 36) original advance: 741.
      // V (GID 57) original advance: 743.
      // A-V kern delta in subtable 2 is -80.
      // v2 = -80 div 2 = -40. v1 = -80 - (-40) = -40.
      // A XAdvance: 741 - 40 = 701.
      // V XOffset: 0 - 40 = -40.
      // V XAdvance: 743 - 40 = 703.

      CheckEquals(701, Glyphs[0].XAdvance, 'A XAdvance');
      CheckEquals(-40, Glyphs[1].XOffset, 'V XOffset');
      CheckEquals(703, Glyphs[1].XAdvance, 'V XAdvance');
    finally
      Glyphs.Free;
    end;
  finally
    Shaper.Free;
  end;
end;

procedure TTestKernFormat2.TestKernAlphabet;
var
  Shaper: TPascalTypeShaper;
  Glyphs: TPascalTypeGlyphString;
  CodePoints: TPascalTypeCodePoints;
  Input: string;
begin
  Input := 'abcdefghijklmnop';
  CodePoints := PascalTypeUnicode.UTF16ToUTF32(Input);

  Shaper := TPascalTypeShaper.CreateShaper(FFontFace, 'latn');
  try
    Shaper.UserFeatures^['kern'] := True;
    Glyphs := Shaper.TextToGlyphs(CodePoints);
    try
      Shaper.Shape(Glyphs);

      // Harfbuzz expected: [a=0+626|b=1+672|c=2+564|d=3@-15,0+657|e=4+621|f=5+403|g=6@-10,0+662|h=7+666|i=8+316|j=9+316|k=10+591|l=11+316|m=12+1021|n=13+666|o=14+644|p=15+672]

      // c (GID 69) original advance 579. d (GID 70) original advance 672.
      // c-d kern delta in subtable 1 is -30.
      // v2 = -15, v1 = -15.
      // c XAdvance: 579 - 15 = 564.
      // d XOffset: 0 - 15 = -15.
      // d XAdvance: 672 - 15 = 657.

      CheckEquals(564, Glyphs[2].XAdvance, 'c XAdvance');
      CheckEquals(-15, Glyphs[3].XOffset, 'd XOffset');
      CheckEquals(657, Glyphs[3].XAdvance, 'd XAdvance');

      // f (GID 72) original advance 413. g (GID 73) original advance 672.
      // f-g kern delta in subtable 1 is -20.
      // v2 = -10, v1 = -10.
      // f XAdvance: 413 - 10 = 403.
      // g XOffset: 0 - 10 = -10.
      // g XAdvance: 672 - 10 = 662.

      CheckEquals(403, Glyphs[5].XAdvance, 'f XAdvance');
      CheckEquals(-10, Glyphs[6].XOffset, 'g XOffset');
      CheckEquals(662, Glyphs[6].XAdvance, 'g XAdvance');

    finally
      Glyphs.Free;
    end;
  finally
    Shaper.Free;
  end;
end;

initialization
  RegisterTest(TTestKernFormat2.Suite);
end.