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#!/usr/bin/env node

/* Convert the deterministic 32-bit BMP emitted by macOS sips into the

* ARGB8888 LVGL resource format accepted by XiaomiVela's launcher. */

const fs = require('fs');

const [input, output] = process.argv.slice(2);

if (!input || !output) {

throw new Error('usage: make_icon_bin.js input.bmp output.bin');

}

const bmp = fs.readFileSync(input);

if (bmp.toString('ascii', 0, 2) !== 'BM') throw new Error('not a BMP file');

const offset = bmp.readUInt32LE(10);

const width = bmp.readInt32LE(18);

const signedHeight = bmp.readInt32LE(22);

const bitsPerPixel = bmp.readUInt16LE(28);

if (width <= 0 || signedHeight === 0 || bitsPerPixel !== 32) {

throw new Error('expected a non-empty 32-bit BMP');

}

const height = Math.abs(signedHeight);

const stride = width * 4;

if (offset + stride * height > bmp.length) throw new Error('truncated BMP pixels');

const resource = Buffer.alloc(12 + stride * height);

resource[0] = 0x19; // LVGL image magic

resource[1] = 0x10; // LV_COLOR_FORMAT_ARGB8888

resource.writeUInt16LE(width, 4);

resource.writeUInt16LE(height, 6);

resource.writeUInt32LE(stride, 8);

for (let row = 0; row < height; row += 1) {

const sourceRow = signedHeight < 0 ? row : height - 1 - row;

bmp.copy(resource, 12 + row * stride, offset + sourceRow * stride,

offset + (sourceRow + 1) * stride);

}

fs.writeFileSync(output, resource);