Initial build: SaaS Cost Predictor Chrome extension MVP

make-icons.js

@@ -0,0 +1,56 @@
+import { writeFileSync } from 'fs';
+import { deflateSync } from 'zlib';
+
+function makePng(size, r, g, b) {
+  const crcTable = new Uint32Array(256);
+  for (let n = 0; n < 256; n++) {
+    let c = n;
+    for (let k = 0; k < 8; k++) {
+      c = (c & 1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1);
+    }
+    crcTable[n] = c;
+  }
+
+  function crc32(buf) {
+    let c = ~0;
+    for (let i = 0; i < buf.length; i++) {
+      c = crcTable[(c ^ buf[i]) & 0xFF] ^ (c >>> 8);
+    }
+    return ~c >>> 0;
+  }
+
+  function writeChunk(type, data) {
+    const len = Buffer.alloc(4);
+    len.writeUInt32BE(data.length, 0);
+    const typeBuf = Buffer.from(type, 'ascii');
+    const crc = Buffer.alloc(4);
+    crc.writeUInt32BE(crc32(Buffer.concat([typeBuf, data])), 0);
+    return Buffer.concat([len, typeBuf, data, crc]);
+  }
+
+  const ihdrData = Buffer.from([
+    0x00, 0x00, 0x00, size, 0x00, 0x00, 0x00, size,
+    0x08, 0x02, 0x00, 0x00, 0x00,
+  ]);
+  const ihdrChunk = writeChunk('IHDR', ihdrData);
+
+  const raw = [];
+  for (let y = 0; y < size; y++) {
+    raw.push(0);
+    for (let x = 0; x < size; x++) {
+      raw.push(r, g, b, 255);
+    }
+  }
+  const rawBuf = Buffer.from(raw);
+  const compressed = deflateSync(rawBuf);
+  const idatChunk = writeChunk('IDAT', compressed);
+  const iendChunk = writeChunk('IEND', Buffer.alloc(0));
+
+  const sig = Buffer.from([0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A]);
+  return Buffer.concat([sig, ihdrChunk, idatChunk, iendChunk]);
+}
+
+writeFileSync('icons/icon16.png', makePng(16, 99, 102, 241));
+writeFileSync('icons/icon48.png', makePng(48, 99, 102, 241));
+writeFileSync('icons/icon128.png', makePng(128, 99, 102, 241));
+console.log('Icons created');