Vision-camera-cropper NPM

vision-camera-cropper

A react native vision camera frame processor for cropping

Versions

For Vision Camera v3, use versions 0.x.

For Vision Camera v4, use versions >= 1.0.0.

Installation

yarn add vision-camera-cropper
cd ios && pod install

Add the plugin to your babel.config.js:

module.exports = {
   plugins: [['react-native-worklets-core/plugin']],
    // ...

Note: You have to restart metro-bundler for changes in the babel.config.js file to take effect.

Usage

Crop a frame and return its base64 or path.

import { crop } from 'vision-camera-cropper';

// ...
const frameProcessor = useFrameProcessor((frame) => {
  'worklet';
  //coordinates in percentage
  const cropRegion = {
    left:10,
    top:10,
    width:80,
    height:30
  }
  const result = crop(frame,{cropRegion:cropRegion,includeImageBase64:true,saveAsFile:false});
  console.log(result.base64);
}, []);

Rotate an image.

const rotated = await rotateImage(base64,degree);

Get Bitmap/UIImage via Reflection

If you are developing a plugin to get the camera frames, you can use reflection to get it as Bitmap or UIImage on the native side.

Java:

Class cls = Class.forName("com.visioncameracropper.CropperFrameProcessorPlugin");
Method m = cls.getMethod("getBitmap",null);
Bitmap bitmap = (Bitmap) m.invoke(null, null);

Objective-C:

- (UIImage*)getUIImage{
    UIImage *image = ((UIImage* (*)(id, SEL))objc_msgSend)(objc_getClass("CropperFrameProcessorPlugin"), sel_registerName("getBitmap"));
    return image;
}

You have to pass {saveBitmap: true} for the crop function.