index.tsx

import Spinner from '../../components/Spinner';
import { BottomBar } from '../../components/BottomBar';
import { getImage } from '../../utils';
import {
  useStyleTransfer,
  STYLE_TRANSFER_CANDY_QUANTIZED,
} from 'react-native-executorch';
import { View, StyleSheet, Image } from 'react-native';
import React, { useContext, useEffect, useState } from 'react';
import { GeneratingContext } from '../../context';
import ScreenWrapper from '../../ScreenWrapper';

export default function StyleTransferScreen() {
  const model = useStyleTransfer({ model: STYLE_TRANSFER_CANDY_QUANTIZED });
  const { setGlobalGenerating } = useContext(GeneratingContext);
  useEffect(() => {
    setGlobalGenerating(model.isGenerating);
  }, [model.isGenerating, setGlobalGenerating]);

  const [imageUri, setImageUri] = useState('');
  const [styledUri, setStyledUri] = useState('');

  const handleCameraPress = async (isCamera: boolean) => {
    const image = await getImage(isCamera);
    const uri = image?.uri;
    if (typeof uri === 'string') {
      setImageUri(uri);
      setStyledUri('');
    }
  };

  const runForward = async () => {
    if (imageUri) {
      try {
        const uri = await model.forward(imageUri, 'url');
        setStyledUri(uri);
      } catch (e) {
        console.error(e);
      }
    }
  };

  if (!model.isReady) {
    return (
      <Spinner
        visible={!model.isReady}
        textContent={`Loading the model ${(model.downloadProgress * 100).toFixed(0)} %`}
      />
    );
  }

  return (
    <ScreenWrapper>
      <View style={styles.imageContainer}>
        <Image
          style={styles.image}
          resizeMode="contain"
          source={
            styledUri
              ? { uri: styledUri }
              : imageUri
                ? { uri: imageUri }
                : require('../../assets/icons/executorch_logo.png')
          }
        />
      </View>
      <BottomBar
        handleCameraPress={handleCameraPress}
        runForward={runForward}
      />
    </ScreenWrapper>
  );
}

const styles = StyleSheet.create({
  imageContainer: {
    flex: 6,
    width: '100%',
    padding: 16,
  },
  image: {
    flex: 1,
    borderRadius: 8,
    width: '100%',
  },
});