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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
| };
|
|
