Bun Bun
57 lines
1.6 KiB
JavaScript
57 lines
1.6 KiB
JavaScript
import { writeFileSync } from 'fs';
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import { deflateSync } from 'zlib';
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function makePng(size, r, g, b) {
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const crcTable = new Uint32Array(256);
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for (let n = 0; n < 256; n++) {
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let c = n;
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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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crcTable[n] = c;
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}
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function crc32(buf) {
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let c = ~0;
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for (let i = 0; i < buf.length; i++) {
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c = crcTable[(c ^ buf[i]) & 0xFF] ^ (c >>> 8);
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}
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return ~c >>> 0;
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}
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function writeChunk(type, data) {
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const len = Buffer.alloc(4);
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len.writeUInt32BE(data.length, 0);
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const typeBuf = Buffer.from(type, 'ascii');
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const crc = Buffer.alloc(4);
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crc.writeUInt32BE(crc32(Buffer.concat([typeBuf, data])), 0);
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return Buffer.concat([len, typeBuf, data, crc]);
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}
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const ihdrData = Buffer.from([
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0x00, 0x00, 0x00, size, 0x00, 0x00, 0x00, size,
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0x08, 0x02, 0x00, 0x00, 0x00,
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]);
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const ihdrChunk = writeChunk('IHDR', ihdrData);
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const raw = [];
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for (let y = 0; y < size; y++) {
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raw.push(0);
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for (let x = 0; x < size; x++) {
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raw.push(r, g, b, 255);
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}
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}
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const rawBuf = Buffer.from(raw);
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const compressed = deflateSync(rawBuf);
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const idatChunk = writeChunk('IDAT', compressed);
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const iendChunk = writeChunk('IEND', Buffer.alloc(0));
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const sig = Buffer.from([0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A]);
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return Buffer.concat([sig, ihdrChunk, idatChunk, iendChunk]);
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}
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writeFileSync('icons/icon16.png', makePng(16, 99, 102, 241));
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writeFileSync('icons/icon48.png', makePng(48, 99, 102, 241));
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writeFileSync('icons/icon128.png', makePng(128, 99, 102, 241));
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console.log('Icons created');
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