Implementing Instagram Filters and Image Editing in React Native

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William Candillon recreated some parts of Instagram’s editing process (namely the filter, rotate, and crop steps) in React Native.

The filters are implemented with GL-React:

Gl-react offers a really efficient paradigm for integrating React and OpenGL together. The library enables you to easily build scenes using React composability. For instance, consider an image with two filters: Brannan and Valencia. It can be expressed as below. The GLImage implementation is based on gl-react-image.

import * as React from "react";
import {Surface} from "gl-react-expo";

import {GLImage, Brannan, Valencia} from "./gl-filters";

export type FilterName = "brannan" | "valencia";
type FilterProps = {
    uri: string,
    aspectRatio: number,
    name: FilterName,
    onDraw?: () => mixed
};

export default class Filter extends React.PureComponent<FilterProps> {

    render(): React.Node {
        const {style, uri, aspectRatio, name, onDraw} = this.props;
        const source = { uri };
        return (
            <Surface style={{ width: 100, height: 100 }}>
                <Brannan on={name === "brannan"}>
                    <Valencia on={name === "valencia"}>
                    <GLImage {...{source, aspectRatio, onDraw}} />
                </Valencia>
                </Brannan>
            </Surface>
        );
    }
}

A more condense writeup is also available: Implementing Instagram filters and picture editing with React Native →