All files constants.js

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"use strict";
 
module.exports = {
  PNG_SIGNATURE: [0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a],
 
  TYPE_IHDR: 0x49484452,
  TYPE_IEND: 0x49454e44,
  TYPE_IDAT: 0x49444154,
  TYPE_PLTE: 0x504c5445,
  TYPE_tRNS: 0x74524e53, // eslint-disable-line camelcase
  TYPE_gAMA: 0x67414d41, // eslint-disable-line camelcase
 
  // color-type bits
  COLORTYPE_GRAYSCALE: 0,
  COLORTYPE_PALETTE: 1,
  COLORTYPE_COLOR: 2,
  COLORTYPE_ALPHA: 4, // e.g. grayscale and alpha
 
  // color-type combinations
  COLORTYPE_PALETTE_COLOR: 3,
  COLORTYPE_COLOR_ALPHA: 6,
 
  COLORTYPE_TO_BPP_MAP: {
    0: 1,
    2: 3,
    3: 1,
    4: 2,
    6: 4,
  },
 
  GAMMA_DIVISION: 100000,
};