85 lines
2.2 KiB
JavaScript
85 lines
2.2 KiB
JavaScript
import { writeFileSync, mkdirSync } from 'fs';
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import { join, dirname } from 'path';
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import { fileURLToPath } from 'url';
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import zlib from 'zlib';
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const __dirname = dirname(fileURLToPath(import.meta.url));
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const iconsDir = join(__dirname, '..', 'static', 'icons');
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mkdirSync(iconsDir, { recursive: true });
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function crc32(buf) {
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let crc = 0xffffffff;
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for (let i = 0; i < buf.length; i++) {
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crc ^= buf[i];
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for (let j = 0; j < 8; j++) {
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crc = (crc >>> 1) ^ (crc & 1 ? 0xedb88320 : 0);
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}
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}
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return (crc ^ 0xffffffff) >>> 0;
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}
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function createChunk(type, data) {
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const typeBytes = Buffer.from(type, 'ascii');
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const len = Buffer.alloc(4);
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len.writeUInt32BE(data.length);
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const body = Buffer.concat([typeBytes, data]);
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const crc = Buffer.alloc(4);
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crc.writeUInt32BE(crc32(body));
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return Buffer.concat([len, body, crc]);
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}
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function generatePNG(size) {
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const bg = [0x1a, 0x1a, 0x2e];
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const gold = [0xc5, 0xa5, 0x5a];
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const pixels = [];
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for (let y = 0; y < size; y++) {
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pixels.push(0);
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for (let x = 0; x < size; x++) {
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if (isCross(x, y, size)) {
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pixels.push(...gold);
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} else {
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pixels.push(...bg);
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}
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}
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}
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const raw = Buffer.from(pixels);
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const compressed = zlib.deflateSync(raw);
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const ihdr = Buffer.alloc(13);
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ihdr.writeUInt32BE(size, 0);
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ihdr.writeUInt32BE(size, 4);
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ihdr[8] = 8;
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ihdr[9] = 2;
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ihdr[10] = 0;
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ihdr[11] = 0;
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ihdr[12] = 0;
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const signature = Buffer.from([137, 80, 78, 71, 13, 10, 26, 10]);
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return Buffer.concat([
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signature,
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createChunk('IHDR', ihdr),
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createChunk('IDAT', compressed),
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createChunk('IEND', Buffer.alloc(0)),
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]);
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}
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function isCross(x, y, size) {
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const cx = Math.floor(size / 2);
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const cy = Math.floor(size / 2);
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const arm = Math.max(2, Math.floor(size * 0.06));
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const halfLen = Math.floor(size * 0.32);
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const topLen = Math.floor(size * 0.38);
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const inVert = Math.abs(x - cx) <= arm && y >= cy - topLen && y <= cy + halfLen;
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const inHoriz = Math.abs(y - cy) <= arm && x >= cx - halfLen && x <= cx + halfLen;
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return inVert || inHoriz;
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}
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writeFileSync(join(iconsDir, 'icon-192.png'), generatePNG(192));
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writeFileSync(join(iconsDir, 'icon-512.png'), generatePNG(512));
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console.log('Icons generated.');
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