Bun Bun
66 lines
1.9 KiB
JavaScript
66 lines
1.9 KiB
JavaScript
const fs = require('fs');
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const path = require('path');
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const zlib = require('zlib');
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const iconsDir = path.join(__dirname, 'icons');
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fs.mkdirSync(iconsDir, { recursive: true });
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function crc32(buf) {
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const table = [];
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for (let i = 0; i < 256; i++) {
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let c = i;
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for (let k = 0; k < 8; k++) {
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c = (c & 1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1);
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}
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table[i] = c;
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}
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let crc = -1;
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for (const byte of buf) {
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crc = table[(crc ^ byte) & 0xFF] ^ (crc >>> 8);
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}
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return (crc ^ -1) >>> 0;
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}
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function makeChunk(typeStr, data) {
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const typeBuf = Buffer.from(typeStr, 'ascii');
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const c = crc32(Buffer.concat([typeBuf, data]));
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const crcBuf = Buffer.alloc(4);
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crcBuf.writeUInt32BE(c, 0);
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const lenBuf = Buffer.alloc(4);
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lenBuf.writeUInt32BE(data.length, 0);
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return Buffer.concat([lenBuf, typeBuf, data, crcBuf]);
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}
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function makePng(size, r, g, b) {
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const sig = Buffer.from([0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A]);
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const ihdrData = Buffer.alloc(13);
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ihdrData.writeUInt32BE(size, 0);
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ihdrData.writeUInt32BE(size, 4);
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ihdrData.writeUInt8(8, 8);
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ihdrData.writeUInt8(2, 9);
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ihdrData.writeUInt8(0, 10);
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ihdrData.writeUInt8(0, 11);
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ihdrData.writeUInt8(0, 12);
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const rawData = [];
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for (let y = 0; y < size; y++) {
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rawData.push(0);
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for (let x = 0; x < size; x++) {
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rawData.push(r, g, b);
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}
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}
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const imageData = zlib.deflateSync(Buffer.from(rawData));
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const ihdr = makeChunk('IHDR', ihdrData);
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const idat = makeChunk('IDAT', imageData);
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const iend = makeChunk('IEND', Buffer.alloc(0));
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return Buffer.concat([sig, ihdr, idat, iend]);
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}
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const r = 15, g = 52, b = 96;
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fs.writeFileSync(path.join(iconsDir, 'icon16.png'), makePng(16, r, g, b));
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fs.writeFileSync(path.join(iconsDir, 'icon48.png'), makePng(48, r, g, b));
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fs.writeFileSync(path.join(iconsDir, 'icon128.png'), makePng(128, r, g, b));
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console.log('Icons created');
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