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crowd-funder-for-time-pwa/docs/camera-implementation.md

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Camera Implementation Documentation

Overview

This document describes how camera functionality is implemented across the TimeSafari application. The application uses cameras for two main purposes:

  1. QR Code scanning
  2. Photo capture

Components

QRScannerDialog.vue

Primary component for QR code scanning in web browsers.

Key Features:

  • Uses qrcode-stream for web-based QR scanning
  • Supports both front and back cameras
  • Provides real-time camera status feedback
  • Implements error handling with user-friendly messages
  • Includes camera switching functionality

Camera Access Flow:

  1. Checks for camera API availability
  2. Enumerates available video devices
  3. Requests camera permissions
  4. Initializes camera stream with preferred settings
  5. Handles various error conditions with specific messages

PhotoDialog.vue

Component for photo capture and selection.

Key Features:

  • Cross-platform photo capture interface
  • Image cropping capabilities
  • File selection fallback
  • Unified interface for different platforms

Services

QRScanner Services

WebDialogQRScanner

Web-based implementation of QR scanning.

Key Methods:

  • checkPermissions(): Verifies camera permission status
  • requestPermissions(): Requests camera access
  • isSupported(): Checks for camera API support
  • Handles various error conditions with specific messages

CapacitorQRScanner

Native implementation using Capacitor's MLKit.

Key Features:

  • Uses @capacitor-mlkit/barcode-scanning
  • Supports both front and back cameras
  • Implements permission management
  • Provides continuous scanning capability

Platform Services

WebPlatformService

Web-specific implementation of platform features.

Camera Capabilities:

  • Uses HTML5 file input with capture attribute
  • Falls back to file selection if camera unavailable
  • Processes captured images for consistent format

CapacitorPlatformService

Native implementation using Capacitor.

Camera Features:

  • Uses Camera.getPhoto() for native camera access
  • Supports image editing
  • Configures high-quality image capture
  • Handles base64 image processing

ElectronPlatformService

Desktop implementation (currently unimplemented).

Status:

  • Camera functionality not yet implemented
  • Planned to use Electron's media APIs

Platform-Specific Considerations

iOS

  • Requires NSCameraUsageDescription in Info.plist
  • Supports both front and back cameras
  • Implements proper permission handling

Android

  • Requires camera permissions in manifest
  • Supports both front and back cameras
  • Handles permission requests through Capacitor

Web

  • Requires HTTPS for camera access
  • Implements fallback mechanisms
  • Handles browser compatibility issues

Error Handling

Common Error Scenarios

  1. No camera found
  2. Permission denied
  3. Camera in use by another application
  4. HTTPS required
  5. Browser compatibility issues

Error Response

  • User-friendly error messages
  • Troubleshooting tips
  • Clear instructions for resolution
  • Platform-specific guidance

Security Considerations

Permission Management

  • Explicit permission requests
  • Permission state tracking
  • Graceful handling of denied permissions

Data Handling

  • Secure image processing
  • Proper cleanup of camera resources
  • No persistent storage of camera data

Best Practices

Camera Access

  1. Always check for camera availability
  2. Request permissions explicitly
  3. Handle all error conditions
  4. Provide clear user feedback
  5. Implement proper cleanup

Performance

  1. Optimize camera resolution
  2. Implement proper resource cleanup
  3. Handle camera switching efficiently
  4. Manage memory usage

User Experience

  1. Clear status indicators
  2. Intuitive camera controls
  3. Helpful error messages
  4. Smooth camera switching
  5. Responsive UI feedback

Future Improvements

Planned Enhancements

  1. Implement Electron camera support
  2. Add advanced camera features
  3. Improve error handling
  4. Enhance user feedback
  5. Optimize performance

Known Issues

  1. Electron camera implementation pending
  2. Some browser compatibility limitations
  3. Platform-specific quirks to address

Dependencies

Key Packages

  • @capacitor-mlkit/barcode-scanning
  • qrcode-stream
  • vue-picture-cropper
  • Platform-specific camera APIs

Testing

Test Scenarios

  1. Permission handling
  2. Camera switching
  3. Error conditions
  4. Platform compatibility
  5. Performance metrics

Test Environment

  • Multiple browsers
  • iOS and Android devices
  • Desktop platforms
  • Various network conditions