Bun Bun
71 lines
2.1 KiB
JavaScript
71 lines
2.1 KiB
JavaScript
// Minimal PNG generator — run before build to create icon files
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const { writeFileSync, mkdirSync } = require('fs')
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function crc32(buf) {
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const table = new Int32Array(256)
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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++) c = (c & 1) ? (0xedb88320 ^ (c >>> 1)) : (c >>> 1)
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table[i] = c
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}
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let crc = -1
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for (let i = 0; i < buf.length; i++) crc = table[(crc ^ buf[i]) & 0xff] ^ (crc >>> 8)
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return crc ^ -1
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}
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function pngChunk(type, data) {
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const len = data.length
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const chunk = new Uint8Array(4 + 4 + len + 4)
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const view = new DataView(chunk.buffer)
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view.setUint32(0, len, false)
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chunk.set(new TextEncoder().encode(type), 4)
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chunk.set(data, 8)
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const crc = crc32(chunk.slice(4, 8 + len))
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view.setUint32(8 + len, crc, false)
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return chunk
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}
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function generatePNG(size, color) {
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const header = new Uint8Array([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a])
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const ihdr = new Uint8Array(13)
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const v = new DataView(ihdr.buffer)
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v.setUint32(0, size, false)
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v.setUint32(4, size, false)
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v.setUint8(8, 8)
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v.setUint8(9, 2)
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v.setUint8(10, 0)
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v.setUint8(11, 0)
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v.setUint8(12, 0)
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const rowLen = 1 + size * 3
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const raw = new Uint8Array(size * rowLen)
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for (let y = 0; y < size; y++) {
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raw[y * rowLen] = 0
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for (let x = 0; x < size; x++) {
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const off = y * rowLen + 1 + x * 3
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raw[off] = color[0]
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raw[off + 1] = color[1]
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raw[off + 2] = color[2]
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}
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}
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const compressed = new Uint8Array(require('zlib').deflateSync(raw))
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const idat = pngChunk('IDAT', compressed)
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const iend = pngChunk('IEND', new Uint8Array(0))
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const out = new Uint8Array(header.length + 4 + 4 + 13 + 4 + idat.length + iend.length)
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let p = 0
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out.set(header, p); p += header.length
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out.set(pngChunk('IHDR', ihdr), p); p += 4 + 4 + 13 + 4
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out.set(idat, p); p += idat.length
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out.set(iend, p)
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return out
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}
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mkdirSync('icons', { recursive: true })
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const teal = [0, 180, 170]
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writeFileSync('icons/icon16.png', generatePNG(16, teal))
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writeFileSync('icons/icon48.png', generatePNG(48, teal))
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writeFileSync('icons/icon128.png', generatePNG(128, teal))
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console.log('Icons generated')
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