@bigin/ns-firebase/mlkit/textrecognition/index.android.js

Fire. Base. Firebase!

import { ImageSource } from '@nativescript/core';
import { MLKitTextRecognition as MLKitTextRecognitionBase } from './textrecognition-common';
export class MLKitTextRecognition extends MLKitTextRecognitionBase {
	createDetector() {
		return com.google.firebase.ml.vision.FirebaseVision.getInstance().getOnDeviceTextRecognizer();
	}
	createSuccessListener() {
		return new com.google.android.gms.tasks.OnSuccessListener({
			onSuccess: (firebaseVisionText) => {
				if (firebaseVisionText.getTextBlocks().size() > 0) {
					this.notify({
						eventName: MLKitTextRecognition.scanResultEvent,
						object: this,
						value: getResult(firebaseVisionText),
					});
				}
			},
		});
	}
}
function boundingBoxToBounds(rect) {
	return {
		origin: {
			x: rect.left,
			y: rect.top,
		},
		size: {
			width: rect.width(),
			height: rect.height(),
		},
	};
}
function getResult(firebaseVisionText) {
	if (firebaseVisionText === null) {
		return {};
	}
	const result = {
		text: firebaseVisionText.getText(),
		blocks: [],
		android: firebaseVisionText,
	};
	for (let i = 0; i < firebaseVisionText.getTextBlocks().size(); i++) {
		const textBlock = firebaseVisionText.getTextBlocks().get(i);
		const lines = textBlock.getLines();
		const lns = [];
		for (let j = 0; j < lines.size(); j++) {
			const line = lines.get(j);
			const elements = line.getElements();
			const elms = [];
			for (let k = 0; k < elements.size(); k++) {
				const element = elements.get(k);
				elms.push({
					text: element.getText(),
					bounds: boundingBoxToBounds(element.getBoundingBox()),
				});
			}
			lns.push({
				text: line.getText(),
				confidence: line.getConfidence(),
				bounds: boundingBoxToBounds(line.getBoundingBox()),
				elements: elms,
			});
		}
		result.blocks.push({
			text: textBlock.getText(),
			confidence: textBlock.getConfidence(),
			bounds: boundingBoxToBounds(textBlock.getBoundingBox()),
			lines: lns,
		});
	}
	return result;
}
export function recognizeTextOnDevice(options) {
	return new Promise((resolve, reject) => {
		try {
			const firebaseVisionTextRecognizer = com.google.firebase.ml.vision.FirebaseVision.getInstance().getOnDeviceTextRecognizer();
			const onSuccessListener = new com.google.android.gms.tasks.OnSuccessListener({
				onSuccess: (firebaseVisionText) => {
					resolve(getResult(firebaseVisionText));
					firebaseVisionTextRecognizer.close();
				},
			});
			const onFailureListener = new com.google.android.gms.tasks.OnFailureListener({
				onFailure: (exception) => reject(exception.getMessage()),
			});
			firebaseVisionTextRecognizer.processImage(getImage(options)).addOnSuccessListener(onSuccessListener).addOnFailureListener(onFailureListener);
		} catch (ex) {
			console.log('Error in firebase.mlkit.recognizeTextOnDevice: ' + ex);
			reject(ex);
		}
	});
}
export function recognizeTextCloud(options) {
	return new Promise((resolve, reject) => {
		try {
			const firebaseVisionCloudTextRecognizer = com.google.firebase.ml.vision.FirebaseVision.getInstance().getCloudTextRecognizer();
			const onSuccessListener = new com.google.android.gms.tasks.OnSuccessListener({
				onSuccess: (firebaseVisionText) => {
					resolve(getResult(firebaseVisionText));
					firebaseVisionCloudTextRecognizer.close();
				},
			});
			const onFailureListener = new com.google.android.gms.tasks.OnFailureListener({
				onFailure: (exception) => reject(exception.getMessage()),
			});
			firebaseVisionCloudTextRecognizer.processImage(getImage(options)).addOnSuccessListener(onSuccessListener).addOnFailureListener(onFailureListener);
		} catch (ex) {
			console.log('Error in firebase.mlkit.recognizeTextCloud: ' + ex);
			reject(ex);
		}
	});
}
function getImage(options) {
	const image = options.image instanceof ImageSource ? options.image.android : options.image.imageSource.android;
	return com.google.firebase.ml.vision.common.FirebaseVisionImage.fromBitmap(image);
}
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