95 lines
2.5 KiB
JavaScript
95 lines
2.5 KiB
JavaScript
import { deflateSync } from 'zlib'
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import { writeFileSync, mkdirSync } from 'fs'
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import { dirname, resolve } from 'path'
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import { fileURLToPath } from 'url'
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/** 生成一个简洁的托盘图标（粉色唱片盘），输出到 resources/tray.png */
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const __dirname = dirname(fileURLToPath(import.meta.url))
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const SIZE = 32
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const cx = SIZE / 2 - 0.5
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const cy = SIZE / 2 - 0.5
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const rOuter = 15
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const rHole = 4
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function px(x, y) {
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const dx = x - cx
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const dy = y - cy
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const d = Math.sqrt(dx * dx + dy * dy)
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// 抗锯齿边缘
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const edge = (r) => Math.max(0, Math.min(1, r - d + 0.5))
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const inDisc = edge(rOuter)
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const inHole = edge(rHole)
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if (inDisc <= 0) return [0, 0, 0, 0]
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// 唱片主体粉色，中心孔洞白色
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const pink = [255, 55, 95]
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const white = [255, 255, 255]
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const a = Math.round(255 * inDisc)
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if (inHole > 0) {
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const t = inHole
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return [
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Math.round(pink[0] * (1 - t) + white[0] * t),
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Math.round(pink[1] * (1 - t) + white[1] * t),
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Math.round(pink[2] * (1 - t) + white[2] * t),
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a
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]
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}
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return [pink[0], pink[1], pink[2], a]
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}
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// 构造原始 RGBA 扫描行（每行前置 filter 0）
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const raw = Buffer.alloc((SIZE * 4 + 1) * SIZE)
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let p = 0
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for (let y = 0; y < SIZE; y++) {
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raw[p++] = 0
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for (let x = 0; x < SIZE; x++) {
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const [r, g, b, a] = px(x, y)
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raw[p++] = r
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raw[p++] = g
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raw[p++] = b
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raw[p++] = a
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}
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}
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const crcTable = (() => {
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const t = []
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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++) c = c & 1 ? 0xedb88320 ^ (c >>> 1) : c >>> 1
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t[n] = c >>> 0
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}
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return t
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})()
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function crc32(buf) {
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let c = 0xffffffff
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for (let i = 0; i < buf.length; i++) c = crcTable[(c ^ buf[i]) & 0xff] ^ (c >>> 8)
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return (c ^ 0xffffffff) >>> 0
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}
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function chunk(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 body = Buffer.concat([typeBuf, data])
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const crc = Buffer.alloc(4)
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crc.writeUInt32BE(crc32(body), 0)
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return Buffer.concat([len, body, crc])
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}
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const sig = Buffer.from([137, 80, 78, 71, 13, 10, 26, 10])
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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 // bit depth
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ihdr[9] = 6 // color type RGBA
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const png = Buffer.concat([
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sig,
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chunk('IHDR', ihdr),
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chunk('IDAT', deflateSync(raw)),
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chunk('IEND', Buffer.alloc(0))
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])
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const out = resolve(__dirname, '../resources/tray.png')
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mkdirSync(dirname(out), { recursive: true })
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writeFileSync(out, png)
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console.log('wrote', out, png.length, 'bytes')
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