| 1 | ;
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| 2 |
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| 3 | module.exports = {
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| 4 | PNG_SIGNATURE: [0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a],
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| 5 |
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| 6 | TYPE_IHDR: 0x49484452,
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| 7 | TYPE_IEND: 0x49454e44,
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| 8 | TYPE_IDAT: 0x49444154,
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| 9 | TYPE_PLTE: 0x504c5445,
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| 10 | TYPE_tRNS: 0x74524e53, // eslint-disable-line camelcase
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| 11 | TYPE_gAMA: 0x67414d41, // eslint-disable-line camelcase
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| 12 |
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| 13 | // color-type bits
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| 14 | COLORTYPE_GRAYSCALE: 0,
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| 15 | COLORTYPE_PALETTE: 1,
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| 16 | COLORTYPE_COLOR: 2,
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| 17 | COLORTYPE_ALPHA: 4, // e.g. grayscale and alpha
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| 18 |
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| 19 | // color-type combinations
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| 20 | COLORTYPE_PALETTE_COLOR: 3,
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| 21 | COLORTYPE_COLOR_ALPHA: 6,
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| 22 |
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| 23 | COLORTYPE_TO_BPP_MAP: {
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| 24 | 0: 1,
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| 25 | 2: 3,
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| 26 | 3: 1,
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| 27 | 4: 2,
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| 28 | 6: 4,
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| 29 | },
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| 30 |
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| 31 | GAMMA_DIVISION: 100000,
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| 32 | };
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