lib-font/src/opentype/tables/simple/bitmap/shared.js

A JS based OpenType font inspector

class BitmapSize {
  constructor(p) {
    this.indexSubTableArrayOffset = p.Offset32; // from beginning of CBLC
    this.indexTablesSize = p.uint32;
    this.numberofIndexSubTables = p.uint32;
    this.colorRef = p.uint32;
    this.hori = new SbitLineMetrics(p);
    this.vert = new SbitLineMetrics(p);
    this.startGlyphIndex = p.uint16;
    this.endGlyphIndex = p.uint16;
    this.ppemX = p.uint8;
    this.ppemY = p.uint8;
    this.bitDepth = p.uint8;
    this.flags = p.int8;
  }
}

class BitmapScale {
  constructor(p) {
    this.hori = new SbitLineMetrics(p);
    this.vert = new SbitLineMetrics(p);
    this.ppemX = p.uint8;
    this.ppemY = p.uint8;
    this.substitutePpemX = p.uint8;
    this.substitutePpemY = p.uint8;
  }
}

class SbitLineMetrics {
  constructor(p) {
    this.ascender = p.int8;
    this.descender = p.int8;
    this.widthMax = p.uint8;
    this.caretSlopeNumerator = p.int8;
    this.caretSlopeDenominator = p.int8;
    this.caretOffset = p.int8;
    this.minOriginSB = p.int8;
    this.minAdvanceSB = p.int8;
    this.maxBeforeBL = p.int8;
    this.minAfterBL = p.int8;
    this.pad1 = p.int8;
    this.pad2 = p.int8;
  }
}

class IndexSubHeader {
  constructor(p) {
    this.indexFormat = p.uint16;
    this.imageFormat = p.uint16;
    this.imageDataOffset = p.Offset32; // Offset to image data in EBDT table.
  }
}

class BigGlyphMetrics {
  constructor(p) {
    this.height = uint8;
    this.width = uint8;
    this.horiBearingX = int8;
    this.horiBearingY = int8;
    this.horiAdvance = uint8;
    this.vertBearingX = int8;
    this.vertBearingY = int8;
    this.vertAdvance = uint8;
  }
}

class SmallGlyphMetrics {
  constructor(p) {
    this.height = p.uint8;
    this.width = p.uint8;
    this.bearingX = p.int8;
    this.bearingY = p.int8;
    this.advance = p.uint8;
  }
}

class EBDTComponent {
  constructor(p) {
    this.glyphID = p.uint16;
    this.xOffset = p.int8;
    this.yOffset = p.int8;
  }
}

class IndexSubTableArray {
  constructor(p) {
    this.firstGlyphIndex = p.uint16;
    this.lastGlyphIndex = p.uint16;
    this.additionalOffsetToIndexSubtable = p.Offset32; // from beginning of EBLC.
  }
}

export {
  BitmapSize,
  BitmapScale,
  SbitLineMetrics,
  IndexSubHeader,
  BigGlyphMetrics,
  SmallGlyphMetrics,
  EBDTComponent,
  IndexSubTableArray,
};