desktop-plugin/tool/gen_app_icons.dart

// 生成全部应用图标（源：资安信 logo 1024x1024 深蓝盾牌+白色人形，透明底）
//   dart run tool/gen_app_icons.dart <源图路径>
// 产物：
//   macos/Runner/Assets.xcassets/AppIcon.appiconset/*.png  （mac App 图标，白底圆角托+盾牌）
//   windows/runner/resources/app_icon.ico                  （16~256 多尺寸 PNG-in-ICO）
//   assets/tray_icon_mac.png / assets/tray_icon_win.png    （托盘：白底圆盘+盾牌，深浅菜单栏均可见）
//   assets/logo.png                                        （原样拷贝，侧栏显示用）
// ignore_for_file: avoid_print
import 'dart:io';
import 'dart:typed_data';

import 'package:image/image.dart';

/// 是否在圆角矩形外（>0 外）
bool _cornerOutside(int x, int y, int x0, int y0, int x1, int y1, int r) {
  final cx = x < x0 + r ? x0 + r : (x > x1 - r ? x1 - r : x);
  final cy = y < y0 + r ? y0 + r : (y > y1 - r ? y1 - r : y);
  final dx = x - cx, dy = y - cy;
  if (dx > 0 || dy > 0) {
    return dx * dx + dy * dy > r * r;
  }
  return false;
}

void main(List<String> args) {
  final src = args.isNotEmpty ? args.first : 'logo-1024.png';
  final logo = decodeImage(File(src).readAsBytesSync())!;
  print('源图 ${logo.width}x${logo.height}');

  // ---------- mac App 图标：白底圆角方托 + 盾牌居中 72% ----------
  Image macIcon(int size) {
    final img = Image(width: size, height: size, numChannels: 4);
    final r = (size * 0.18).round(); // macOS squircle 风格圆角
    final inset = (size * 0.14).round();
    final inner = copyResize(logo, width: size - inset * 2);
    for (var y = 0; y < size; y++) {
      for (var x = 0; x < size; x++) {
        if (!_cornerOutside(x, y, 0, 0, size - 1, size - 1, r)) {
          final hasPixel = x >= inset &&
              x < inset + inner.width &&
              y >= inset &&
              y < inset + inner.height;
          final p = hasPixel ? inner.getPixel(x - inset, y - inset) : null;
          if (p != null && p.a.toInt() > 0) {
            img.setPixel(x, y, p);
          } else {
            img.setPixel(x, y, ColorRgba8(255, 255, 255, 255));
          }
        }
      }
    }
    return img;
  }

  final appIconDir = Directory('macos/Runner/Assets.xcassets/AppIcon.appiconset');
  const macSizes = <String, int>{
    'app_icon_16.png': 16,
    'app_icon_32.png': 32,
    'app_icon_64.png': 64,
    'app_icon_128.png': 128,
    'app_icon_256.png': 256,
    'app_icon_512.png': 512,
    'app_icon_1024.png': 1024,
  };
  for (final e in macSizes.entries) {
    final f = File('${appIconDir.path}/${e.key}');
    if (!f.existsSync()) {
      print('跳过（Contents.json 未声明）：${e.key}');
      continue;
    }
    f.writeAsBytesSync(encodePng(macIcon(e.value)));
    print('written ${f.path} (${e.value}px)');
  }

  // ---------- Windows ICO（PNG-in-ICO） ----------
  Uint8List buildIco(List<int> sizes) {
    final pngs = <int, Uint8List>{};
    for (final s in sizes) {
      pngs[s] = Uint8List.fromList(encodePng(macIcon(s)));
    }
    final b = BytesBuilder();
    b.addByte(0); b.addByte(0); // reserved
    b.addByte(1); b.addByte(0); // type = icon
    b.addByte(sizes.length); b.addByte(0); // count
    var offset = 6 + 16 * sizes.length;
    for (final s in sizes) {
      final png = pngs[s]!;
      b.addByte(s >= 256 ? 0 : s); // width
      b.addByte(s >= 256 ? 0 : s); // height
      b.addByte(0); // colors
      b.addByte(0); // reserved
      b.addByte(1); b.addByte(0); // planes
      b.addByte(32); b.addByte(0); // bitcount
      for (var i = 0; i < 4; i++) {
        b.addByte((png.length >> (8 * i)) & 0xff);
      }
      for (var i = 0; i < 4; i++) {
        b.addByte((offset >> (8 * i)) & 0xff);
      }
      offset += png.length;
    }
    for (final s in sizes) {
      b.add(pngs[s]!);
    }
    return b.toBytes();
  }

  final ico = buildIco([16, 24, 32, 48, 64, 128, 256]);
  File('windows/runner/resources/app_icon.ico').writeAsBytesSync(ico);
  print('written windows/runner/resources/app_icon.ico (${ico.length} bytes)');

  // ---------- 托盘：白底圆盘 + 盾牌居中 ----------
  Image trayIcon(int size) {
    final img = Image(width: size, height: size, numChannels: 4);
    final c = (size - 1) / 2;
    final rOuter = c;
    final inset = (size * 0.13).round();
    final inner = copyResize(logo, width: size - inset * 2);
    for (var y = 0; y < size; y++) {
      for (var x = 0; x < size; x++) {
        final d = ((x - c) * (x - c) + (y - c) * (y - c));
        if (d > rOuter * rOuter) continue; // 圆外透明
        final hasPixel = x >= inset && x < inset + inner.width && y >= inset && y < inset + inner.height;
        final p = hasPixel ? inner.getPixel(x - inset, y - inset) : null;
        if (p != null && p.a.toInt() > 0) {
          img.setPixel(x, y, p);
        } else {
          img.setPixel(x, y, ColorRgba8(255, 255, 255, 255));
        }
      }
    }
    return img;
  }

  Directory('assets').createSync(recursive: true);
  File('assets/tray_icon_mac.png').writeAsBytesSync(encodePng(trayIcon(64)));
  File('assets/tray_icon_win.png').writeAsBytesSync(encodePng(trayIcon(32)));
  print('written assets/tray_icon_mac.png / tray_icon_win.png');

  // ---------- 原样 logo ----------
  File('assets/logo.png').writeAsBytesSync(encodePng(logo));
  print('written assets/logo.png');
}