logitech-brio-zoom-control/examples/preload.js

Cross-platform native library for controlling Logitech MX Brio camera zoom with 4K video support in Electron applications

// Electron Preload Script
// Save as: preload.js

const { contextBridge, ipcRenderer } = require('electron');

// Expose protected methods that allow the renderer process to use
// the ipcRenderer without exposing the entire object
contextBridge.exposeInMainWorld('cameraAPI', {
    // Device management
    discoverDevices: () => ipcRenderer.invoke('camera:discover'),
    initializeDevice: (deviceId) => ipcRenderer.invoke('camera:initialize', deviceId),
    initializeFirstDevice: () => ipcRenderer.invoke('camera:initialize-first'),
    releaseDevice: () => ipcRenderer.invoke('camera:release'),
    
    // Zoom control
    getZoomCapabilities: () => ipcRenderer.invoke('camera:zoom:capabilities'),
    setZoomAbsolute: (zoomValue) => ipcRenderer.invoke('camera:zoom:set-absolute', zoomValue),
    setZoomRelative: (zoomDelta) => ipcRenderer.invoke('camera:zoom:set-relative', zoomDelta),
    getZoomValue: () => ipcRenderer.invoke('camera:zoom:get'),
    
    // Convenience methods
    zoomIn: (amount) => ipcRenderer.invoke('camera:zoom:in', amount),
    zoomOut: (amount) => ipcRenderer.invoke('camera:zoom:out', amount),
    resetZoom: () => ipcRenderer.invoke('camera:zoom:reset'),
    maxZoom: () => ipcRenderer.invoke('camera:zoom:max'),
    
    // Library info
    getLibraryInfo: () => ipcRenderer.invoke('library:info')
});