zmj_app/makeIcons.js

const sharp = require("sharp");
const fs = require("fs");
if (!fs.existsSync("ios_icons")) {
    if (fs.mkdirSync("ios_icons")) {
        return;
    }
}
var iosSizes = [
    20,
    29,
    40,
    50,
    57,
    58,
    60,
    72,
    76,
    80,
    87,
    100,
    114,
    120,
    144,
    152,
    167,
    180,
    1024,
];
console.log("ios icons:");
iosSizes.forEach((size) => {
    console.log(
        `<icon height="${size}" src="res/icon/ios/icon-${size}.png" width="${size}" />`
    );
    sharp("icon.png")
        .resize(size)
        .toBuffer()
        .then((data) => {
            var file = fs.open(
                `./res/icon/ios/icon-${size}.png`,
                "w",
                (err, fd) => {
                    if (err) {
                        return console.error(err);
                    }
                    fs.writeFile(fd, data, (err) => {
                        if (err) {
                            return console.error(err);
                        }
                    });
                }
            );
        })
        .catch((e) => {
            console.log(e);
        });
});

console.log("android icons:");
var androidSizes = { hdpi: 72, xhdpi: 96, xxhdpi: 144, xxxhdpi: 192 };
Object.keys(androidSizes).forEach((key) => {
    let size = androidSizes[key];
    console.log(
        `<icon src="res/icon/android/icon-${key}.png" density="${key}"/>`
    );
    const roundedCorners = Buffer.from(
        `<svg><rect x="0" y="0" width="${size}" height="${size}" rx="${
            size / 5
        }" ry="${size / 4}"/></svg>`
    );
    sharp("icon.png")
        .resize(size)
        .composite([
            {
                input: roundedCorners,
                blend: "dest-in",
            },
        ])
        .toBuffer()
        .then((data) => {
            var file = fs.open(
                `./res/icon/android/icon-${key}.png`,
                "w",
                (err, fd) => {
                    if (err) {
                        return console.error(err);
                    }
                    fs.writeFile(fd, data, (err) => {
                        if (err) {
                            return console.error(err);
                        }
                    });
                }
            );
        })
        .catch((e) => {
            console.log(e);
        });
});