@muellertek/pixel-data/dist/index.js

Extract pixel data from images in React Native using Expo. A lightweight library for accessing raw pixel data from images in React Native applications using Expo's 2D context.

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.PixelDataError = void 0;
exports.getPixelData = getPixelData;
class PixelDataError extends Error {
    constructor(message) {
        super(message);
        this.name = 'PixelDataError';
    }
}
exports.PixelDataError = PixelDataError;
function getPixelData(_a) {
    return __awaiter(this, arguments, void 0, function* ({ expo2dContext, source }) {
        try {
            if (!expo2dContext || !source) {
                throw new PixelDataError('Missing required parameters');
            }
            const { width, height, asset } = source;
            if (!width || !height || width <= 0 || height <= 0) {
                throw new PixelDataError('Invalid dimensions');
            }
            yield asset.downloadAsync();
            // Draw the image with proper parameters
            const rectangle = [0, 0, width, height];
            expo2dContext.drawImage(asset, ...rectangle);
            // Get the pixel data
            const imageData = expo2dContext.getImageData(...rectangle);
            if (!(imageData === null || imageData === void 0 ? void 0 : imageData.data)) {
                throw new PixelDataError('Failed to get image data');
            }
            return {
                asset,
                width,
                height,
                data: imageData.data
            };
        }
        catch (error) {
            if (error instanceof PixelDataError) {
                throw error;
            }
            throw new PixelDataError(`Failed to process pixel data: ${error instanceof Error ? error.message : 'Unknown error'}`);
        }
    });
}