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opencode v2 mirror
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4.6 kB · 133 lines
TypeScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134import { deflateSync } from "node:zlib"
const size = 16const frameRate = 30const duration = 1.2const frameCount = frameRate * durationconst opacity = [0.2, 0.5, 0.75, 1]// Each digit selects one dot opacity for one of the eight source key poses.const poses = [ "0000000000003000031000321", "0000000000003000320032100", "0000000000333002100010000", "3000023000123000000000000", "1230001300003000000000000", "0012300230003000000000000", "0000100022003330000000000", "0000000000003330002200001",].map((pose) => Array.from(pose, (value) => opacity[Number(value)]))const crcTable = Array.from({ length: 256 }, (_, value) => Array.from({ length: 8 }).reduce<number>((crc) => ((crc & 1) !== 0 ? 0xedb88320 ^ (crc >>> 1) : crc >>> 1), value),)
await Bun.write(new URL("../src/v2/components/session-progress-indicator-v2-1x.png", import.meta.url), apng(1))
function apng(scale: number) { const frameSize = size * scale const header = Buffer.alloc(13) header.writeUInt32BE(frameSize, 0) header.writeUInt32BE(frameSize, 4) header[8] = 8 header[9] = 6
const animation = Buffer.alloc(8) animation.writeUInt32BE(frameCount, 0) animation.writeUInt32BE(0, 4) const chunks = [chunk("IHDR", header), chunk("acTL", animation)] const sequence = { value: 0 }
Array.from({ length: frameCount }, (_, frame) => { const control = Buffer.alloc(26) control.writeUInt32BE(sequence.value++, 0) control.writeUInt32BE(frameSize, 4) control.writeUInt32BE(frameSize, 8) control.writeUInt16BE(1, 20) control.writeUInt16BE(frameRate, 22) chunks.push(chunk("fcTL", control))
const data = deflateSync(pixels(scale, frame), { level: 9 }) if (frame === 0) { chunks.push(chunk("IDAT", data)) return } const frameData = Buffer.alloc(data.length + 4) frameData.writeUInt32BE(sequence.value++, 0) data.copy(frameData, 4) chunks.push(chunk("fdAT", frameData)) })
return Buffer.concat([Buffer.from([137, 80, 78, 71, 13, 10, 26, 10]), ...chunks, chunk("IEND", Buffer.alloc(0))])}
function pixels(scale: number, frame: number) { const frameSize = size * scale const stride = frameSize * 4 + 1 const pixels = Buffer.alloc(stride * frameSize) const progress = (frame / frameCount) * poses.length const current = Math.floor(progress) const next = (current + 1) % poses.length const mix = easeOut(progress - current)
Array.from({ length: frameSize }, (_, y) => (pixels[y * stride] = 0)) poses[current].forEach((value, index) => { draw( pixels, stride, (1 + (index % 5) * 3) * scale, (1 + Math.floor(index / 5) * 3) * scale, 3 * scale, value + (poses[next][index] - value) * mix, ) }) return pixels}
function draw(pixels: Buffer, stride: number, x: number, y: number, size: number, opacity: number) { const left = Math.floor(x) const top = Math.floor(y) const right = Math.ceil(x + size) const bottom = Math.ceil(y + size)
Array.from({ length: bottom - top }, (_, row) => top + row).forEach((py) => Array.from({ length: right - left }, (_, column) => left + column).forEach((px) => { const coverageX = Math.max(0, Math.min(px + 1, x + size) - Math.max(px, x)) const coverageY = Math.max(0, Math.min(py + 1, y + size) - Math.max(py, y)) const offset = py * stride + 1 + px * 4 pixels[offset] = 255 pixels[offset + 1] = 255 pixels[offset + 2] = 255 pixels[offset + 3] = Math.round(opacity * coverageX * coverageY * 255) }), )}
function easeOut(progress: number) { const curve = (value: number, first: number, second: number) => { const inverse = 1 - value return 3 * inverse * inverse * value * first + 3 * inverse * value * value * second + value * value * value } const parameter = Array.from({ length: 16 }).reduce<[number, number]>( (range) => { const middle = (range[0] + range[1]) / 2 return curve(middle, 0, 0.58) < progress ? [middle, range[1]] : [range[0], middle] }, [0, 1], ) return curve((parameter[0] + parameter[1]) / 2, 0, 1)}
function chunk(type: string, data: Buffer) { const name = Buffer.from(type) const result = Buffer.alloc(data.length + 12) result.writeUInt32BE(data.length, 0) name.copy(result, 4) data.copy(result, 8) result.writeUInt32BE(crc32(Buffer.concat([name, data])), data.length + 8) return result}
function crc32(data: Buffer) { return ( (data.reduce<number>((crc, value) => crcTable[(crc ^ value) & 0xff] ^ (crc >>> 8), 0xffffffff) ^ 0xffffffff) >>> 0 )}