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128 lines
3.0 KiB
128 lines
3.0 KiB
import EXIF from 'exif-js';
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const MAX_IMAGE_DIMENSION = 1280;
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const getImageUrl = inputFile => new Promise((resolve, reject) => {
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if (window.URL && URL.createObjectURL) {
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try {
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resolve(URL.createObjectURL(inputFile));
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} catch (error) {
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reject(error);
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}
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return;
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}
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const reader = new FileReader();
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reader.onerror = (...args) => reject(...args);
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reader.onload = ({ target }) => resolve(target.result);
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reader.readAsDataURL(inputFile);
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});
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const loadImage = inputFile => new Promise((resolve, reject) => {
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getImageUrl(inputFile).then(url => {
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const img = new Image();
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img.onerror = (...args) => reject(...args);
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img.onload = () => resolve(img);
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img.src = url;
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}).catch(reject);
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});
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const getOrientation = (img, type = 'image/png') => new Promise(resolve => {
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if (type !== 'image/jpeg') {
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resolve(1);
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return;
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}
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EXIF.getData(img, () => {
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const orientation = EXIF.getTag(img, 'Orientation');
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resolve(orientation);
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});
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});
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const processImage = (img, { width, height, orientation, type = 'image/png' }) => new Promise(resolve => {
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const canvas = document.createElement('canvas');
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[canvas.width, canvas.height] = orientation < 5 ? [width, height] : [height, width];
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const context = canvas.getContext('2d');
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switch (orientation) {
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case 2:
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context.translate(width, 0);
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break;
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case 3:
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context.translate(width, height);
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break;
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case 4:
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context.translate(0, height);
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break;
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case 5:
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context.rotate(0.5 * Math.PI);
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context.translate(1, -1);
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break;
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case 6:
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context.rotate(0.5 * Math.PI);
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context.translate(0, -height);
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break;
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case 7:
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context.rotate(0.5, Math.PI);
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context.translate(width, -height);
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break;
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case 8:
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context.rotate(-0.5, Math.PI);
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context.translate(-width, 0);
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break;
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}
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context.drawImage(img, 0, 0, width, height);
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canvas.toBlob(resolve, type);
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});
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const resizeImage = (img, type = 'image/png') => new Promise((resolve, reject) => {
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const { width, height } = img;
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let newWidth, newHeight;
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if (width > height) {
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newHeight = height * MAX_IMAGE_DIMENSION / width;
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newWidth = MAX_IMAGE_DIMENSION;
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} else if (height > width) {
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newWidth = width * MAX_IMAGE_DIMENSION / height;
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newHeight = MAX_IMAGE_DIMENSION;
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} else {
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newWidth = MAX_IMAGE_DIMENSION;
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newHeight = MAX_IMAGE_DIMENSION;
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}
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getOrientation(img, type)
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.then(orientation => processImage(img, {
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width: newWidth,
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height: newHeight,
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orientation,
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type,
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}))
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.then(resolve)
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.catch(reject);
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});
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export default inputFile => new Promise((resolve, reject) => {
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if (!inputFile.type.match(/image.*/) || inputFile.type === 'image/gif') {
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resolve(inputFile);
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return;
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}
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loadImage(inputFile).then(img => {
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if (img.width < MAX_IMAGE_DIMENSION && img.height < MAX_IMAGE_DIMENSION) {
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resolve(inputFile);
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return;
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}
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resizeImage(img, inputFile.type)
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.then(resolve)
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.catch(() => resolve(inputFile));
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}).catch(reject);
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});
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