API Reference

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Error Classes

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FacebetterError

• message: Error message
• code: Error code (default -1)
• name: Error name (fixed as ‘FacebetterError’)

class FacebetterError extends Error {
    constructor(message, code = -1)
}

try {
    // Some operation
} catch (error) {
    if (error instanceof FacebetterError) {
        console.error('Facebetter error:', error.message);
        console.error('Error code:', error.code);
    }
}

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Configuration Classes

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EngineConfig

new EngineConfig(config)

• config.appId (string, optional): Application ID (required if licenseJson is not provided)
• config.appKey (string, optional): Application key (required if licenseJson is not provided)
• config.licenseJson (string, optional): License JSON string (if provided, appId and appKey are not needed)
• config.externalContext (boolean, optional): Whether to use external OpenGL context (reserved for configuration structure alignment in Web/WASM environment, but currently not effective)

• isValid(): Validate if configuration is valid
• toString(): Return string representation of configuration

• If licenseJson is not empty, use license data verification (supports online response and offline license)
• Otherwise, use appId and appKey for automatic online verification

const config = new EngineConfig({
    appId: 'your-app-id',
    appKey: 'your-app-key'
});

// Or use licenseJson
const config = new EngineConfig({
    licenseJson: '{"license": "..."}'
});

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Enumeration Types

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BeautyType

BeautyType = {
    Basic: 0,          // Basic beauty
    Reshape: 1,        // Face reshaping
    Makeup: 2,         // Makeup effects
    VirtualBackground: 3    // Virtual background
};

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BasicParam

BasicParam = {
    Smoothing: 0,   // Skin smoothing
    Sharpening: 1,  // Sharpening
    Whitening: 2,   // Whitening
    Rosiness: 3     // Rosiness
};

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ReshapeParam

ReshapeParam = {
    FaceThin: 0,      // Face thinning
    FaceVShape: 1,    // V-face
    FaceNarrow: 2,    // Narrow face
    FaceShort: 3,     // Short face
    Cheekbone: 4,     // Cheekbone
    Jawbone: 5,       // Jawbone
    Chin: 6,          // Chin
    NoseSlim: 7,      // Nose slimming
    EyeSize: 8,       // Eye enlargement
    EyeDistance: 9    // Eye distance
};

​

MakeupParam

MakeupParam = {
    Lipstick: 0,  // Lipstick
    Blush: 1      // Blush
};

​

LipstickStyle

LipstickStyle = {
    Rouge: 0,  // Rose red
    Coral: 1,  // Coral
    Pink: 2    // Pink (default)
};

​

BlushStyle

BlushStyle = {
    Classic: 0,  // Classic (default)
    Peach: 1,    // Peach
    Rose: 2      // Rose
};

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MirrorMode

MirrorMode = {
    None: 0,        // No mirror
    Horizontal: 1,  // Mirror horizontally (e.g. front camera selfie)
    Vertical: 2,    // Mirror vertically
    Both: 3         // Mirror both axes
};

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Resource Management

• setFilter(filterId): Set filter
  • Parameters: filterId (string) unique filter identifier. Pass an empty string to clear.
• setFilterIntensity(intensity): Set filter intensity
  • Parameters: intensity (number) intensity value, range [0.0, 1.0].
• setSticker(stickerId): Set sticker
  • Parameters: stickerId (string) unique sticker identifier. Pass an empty string to clear.
• registerFilter(filterId, resource): Register filter
  • Parameters:
    • filterId (string): Unique filter identifier
    • resource (string|Uint8Array): Resource path (.fbd file) or Uint8Array data
• registerSticker(stickerId, resource): Register sticker
  • Parameters:
    • stickerId (string): Unique sticker identifier
    • resource (string|Uint8Array): Resource path (.fbd file) or Uint8Array data
• unregisterFilter(filterId): Unload filter
• unregisterAllFilters(): Unload all filters
• unregisterSticker(stickerId): Unload sticker
• unregisterAllStickers(): Unload all stickers
• getRegisteredFilters(): Get list of registered filters
  • Returns: string[]
• getRegisteredStickers(): Get list of registered stickers
  • Returns: string[]

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ProcessMode

ProcessMode = {
    Image: 0,   // Image mode, suitable for single image processing
    Video: 1    // Video mode, suitable for video streams and live scenarios, better performance
};

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BackgroundMode

BackgroundMode = {
    None: 0,   // No background processing
    Blur: 1,   // Blur background
    Image: 2   // Background image replacement
};

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VirtualBackgroundOptions

new VirtualBackgroundOptions(options)

• options (Object, optional): Options object
  • mode (BackgroundMode, optional): Background mode, defaults to BackgroundMode.None
  • backgroundImage (ImageData|HTMLImageElement|HTMLCanvasElement, optional): Background image, required when mode is Image

• isValid(): Validate if options are valid
  • Returns: boolean
  • When mode is Image, checks if backgroundImage exists

import { VirtualBackgroundOptions, BackgroundMode } from 'facebetter';

// Create blur background options
const blurOptions = new VirtualBackgroundOptions({
  mode: BackgroundMode.Blur
});

// Create image background options
const bgImage = new Image();
bgImage.src = 'background.jpg';
const imageOptions = new VirtualBackgroundOptions({
  mode: BackgroundMode.Image,
  backgroundImage: bgImage
});

// Validate options
if (imageOptions.isValid()) {
  engine.setVirtualBackground(imageOptions);
}

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Engine Classes

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BeautyEffectEngine

new BeautyEffectEngine(config)

• config (EngineConfig): Engine configuration object

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Initialization

• init(options): Initialize engine
  • Parameters:
    • options (Object, optional): Initialization options
      • timeout (number, optional): WASM module loading timeout in milliseconds, default 30000
      • authTimeout (number, optional): Online authentication timeout in milliseconds, default 10000
  • Returns: Promise<void>
  • Example:
    await engine.init();
    // Or specify timeout
    await engine.init({
      timeout: 60000,      // WASM loading timeout 60 seconds
      authTimeout: 15000   // Authentication timeout 15 seconds
    });
    
• setLogConfig(config): Set log configuration
  • Parameters:
    • config.consoleEnabled (boolean, optional): Enable console logging, default false
    • config.fileEnabled (boolean, optional): Enable file logging, default false (not supported in browser environment)
    • config.level (number, optional): Log level (0=DEBUG, 1=INFO, 2=WARN, 3=ERROR), default 0
    • config.fileName (string, optional): Log file name, default empty string
  • Returns: Promise<void>
  • Note: Can be called before or after init(), but recommended to call before init()

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Parameter Settings

• setBasicParam(param, value): Set basic beauty parameter
  • Parameters:
    • param (BasicParam): Parameter type
    • value (number): Parameter value, range [0.0, 1.0] (float)
  • Returns: void
  • Example: engine.setBasicParam(BasicParam.Whitening, 0.5);
• setReshapeParam(param, value): Set face reshape parameter
  • Parameters:
    • param (ReshapeParam): Parameter type
    • value (number): Parameter value, range [0.0, 1.0] (float)
  • Returns: void
  • Example: engine.setReshapeParam(ReshapeParam.FaceThin, 0.5);
• setMakeupParam(param, value): Set makeup parameter
  • Parameters:
    • param (MakeupParam): Parameter type
    • value (number): Parameter value, range [0.0, 1.0] (float)
  • Returns: void
  • Example: engine.setMakeupParam(MakeupParam.Lipstick, 0.5);
• setLipstickStyle(style): Set lipstick style
  • Parameters:
    • style (LipstickStyle): Lipstick style
  • Returns: void
  • Example: engine.setLipstickStyle(LipstickStyle.Rouge);
• setBlushStyle(style): Set blush style
  • Parameters:
    • style (BlushStyle): Blush style
  • Returns: void
  • Example: engine.setBlushStyle(BlushStyle.Classic);
• setSkinOnlyBeauty(enabled): Set whether beauty is applied only to skin regions
  • Parameters:
    • enabled (boolean): true to enable skin-only beauty, false to apply to entire image
  • Returns: void
  • Example:
    // Enable skin-only beauty
    engine.setSkinOnlyBeauty(true);
    
    // Disable skin-only beauty
    engine.setSkinOnlyBeauty(false);
    
• setVirtualBackground(options): Set virtual background (unified API, consistent with other platforms)
  • Parameters:
    • options (VirtualBackgroundOptions|Object): Virtual background options
      • mode (BackgroundMode): Background mode (None, Blur, Image)
      • backgroundImage (ImageData|HTMLImageElement|HTMLCanvasElement, optional): Background image (required when mode is Image)
  • Returns: void
  • Example:
    import { VirtualBackgroundOptions, BackgroundMode } from 'facebetter';
    
    // Set blur background
    const blurOptions = new VirtualBackgroundOptions({
      mode: BackgroundMode.Blur
    });
    engine.setVirtualBackground(blurOptions);
    
    // Set image background
    const bgImage = new Image();
    bgImage.onload = () => {
      const imageOptions = new VirtualBackgroundOptions({
        mode: BackgroundMode.Image,
        backgroundImage: bgImage
      });
      engine.setVirtualBackground(imageOptions);
    };
    bgImage.src = 'background.jpg';
    
    // Simplified syntax
    engine.setVirtualBackground({
      mode: BackgroundMode.Blur
    });
    

​

Image Processing

• processImage(input, width, height, frameType, mirrorMode): Process image
  • Parameters:
    • input (ImageData | HTMLImageElement | HTMLCanvasElement | HTMLVideoElement | Uint8ClampedArray): Input image
    • width (number, optional): Image width (required when input is Uint8ClampedArray)
    • height (number, optional): Image height (required when input is Uint8ClampedArray)
    • frameType (FrameType, optional): Frame type, defaults to FrameType.Video
    • mirrorMode (MirrorMode, optional): Mirror mode applied to input before processing, defaults to MirrorMode.None
  • Returns: ImageData (synchronous return, not Promise)
  • Example:
    // Using ImageData
    const result = engine.processImage(
        imageData, 
        640, 
        480, 
        FrameType.Video,
        MirrorMode.Horizontal
    );
    

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Resource Management

• destroy(): Destroy engine and release resources
  • Returns: void
  • Note: Call when engine is no longer needed to free memory and WASM resources
  • Example: engine.destroy();

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Utility Functions

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loadWasmModule

import { loadWasmModule } from 'facebetter';
const module = await loadWasmModule();

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Usage Examples

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Complete Example

import { 
    BeautyEffectEngine, 
    EngineConfig, 
    BeautyType, 
    BasicParam,
    FrameType 
} from 'facebetter';

// Create configuration
const config = new EngineConfig({
    appId: 'your-app-id',
    appKey: 'your-app-key'
});

// Create engine
const engine = new BeautyEffectEngine(config);

// Set logging
await engine.setLogConfig({
    consoleEnabled: true,
    level: 1
});

// Initialize
await engine.init();

// Set parameters
engine.setBasicParam(BasicParam.Whitening, 0.5);
engine.setBasicParam(BasicParam.Smoothing, 0.5);

// Process image
const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);

const result = engine.processImage(
    imageData, 
    canvas.width, 
    canvas.height, 
    ProcessMode.Video
);

// Draw result
ctx.putImageData(result, 0, 0);

// Release resources
engine.destroy();

​

Deprecated APIs

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Beauty Type Control

• setBeautyTypeEnabled(beautyType, enabled)
  • Description: [Deprecated] Enable or disable beauty type (No effect in parameter-driven mode)
  • Return Value: void
• isBeautyTypeEnabled(beautyType)
  • Description: [Deprecated] Check if beauty type is enabled (Always returns false)
  • Return Value: false
• disableAllBeautyTypes()
  • Description: [Deprecated] Disable all beauty types (Please reset effects by zeroing parameters)
  • Return Value: void