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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/@expo/image-utils/build
Просмотр файла: Ico.js
"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.generateAsync = void 0;
// Inspired by https://github.com/kevva/to-ico but reuses existing packages to keep bundle size small.
const parse_png_1 = __importDefault(require("parse-png"));
const constants = {
directorySize: 16,
bitmapSize: 40,
headerSize: 6,
colorMode: 0,
};
function createHeader(header) {
const buffer = Buffer.alloc(constants.headerSize);
buffer.writeUInt16LE(0, 0);
buffer.writeUInt16LE(1, 2);
buffer.writeUInt16LE(header, 4);
return buffer;
}
function createDirectory(data, offset) {
const buffer = Buffer.alloc(constants.directorySize);
const size = data.data.length + constants.bitmapSize;
const width = data.width === 256 ? 0 : data.width;
const height = data.height === 256 ? 0 : data.height;
const bpp = data.bpp * 8;
buffer.writeUInt8(width, 0);
buffer.writeUInt8(height, 1);
buffer.writeUInt8(0, 2);
buffer.writeUInt8(0, 3);
buffer.writeUInt16LE(1, 4);
buffer.writeUInt16LE(bpp, 6);
buffer.writeUInt32LE(size, 8);
buffer.writeUInt32LE(offset, 12);
return buffer;
}
function createBitmap(data, compression) {
const buffer = Buffer.alloc(constants.bitmapSize);
buffer.writeUInt32LE(constants.bitmapSize, 0);
buffer.writeInt32LE(data.width, 4);
buffer.writeInt32LE(data.height * 2, 8);
buffer.writeUInt16LE(1, 12);
buffer.writeUInt16LE(data.bpp * 8, 14);
buffer.writeUInt32LE(compression, 16);
buffer.writeUInt32LE(data.data.length, 20);
buffer.writeInt32LE(0, 24);
buffer.writeInt32LE(0, 28);
buffer.writeUInt32LE(0, 32);
buffer.writeUInt32LE(0, 36);
return buffer;
}
function createDIB(data, width, height, bpp) {
const cols = width * bpp;
const rows = height * cols;
const end = rows - cols;
const buffer = Buffer.alloc(data.length);
for (let row = 0; row < rows; row += cols) {
for (let col = 0; col < cols; col += bpp) {
let pos = row + col;
const r = data.readUInt8(pos);
const g = data.readUInt8(pos + 1);
const b = data.readUInt8(pos + 2);
const a = data.readUInt8(pos + 3);
pos = end - row + col;
buffer.writeUInt8(b, pos);
buffer.writeUInt8(g, pos + 1);
buffer.writeUInt8(r, pos + 2);
buffer.writeUInt8(a, pos + 3);
}
}
return buffer;
}
function generateFromPNGs(pngs) {
const header = createHeader(pngs.length);
const arr = [header];
let len = header.length;
let offset = constants.headerSize + constants.directorySize * pngs.length;
for (const png of pngs) {
const dir = createDirectory(png, offset);
arr.push(dir);
len += dir.length;
offset += png.data.length + constants.bitmapSize;
}
for (const png of pngs) {
const header = createBitmap(png, constants.colorMode);
const dib = createDIB(png.data, png.width, png.height, png.bpp);
arr.push(header, dib);
len += header.length + dib.length;
}
return Buffer.concat(arr, len);
}
async function generateAsync(buffers) {
const pngs = await Promise.all(buffers.map(x => (0, parse_png_1.default)(x)));
return generateFromPNGs(pngs);
}
exports.generateAsync = generateAsync;
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