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Resize images by area instead of fixed dimensions (#8083)

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To improve the way super tall or super ride images are treated, the
numbers remain the same, 1280x1280 and 400x400, but if an image
is less in one dimension than the other, the other can become larger

Thanks to @WAHa_06x36@mastodon.social for the tip
This commit is contained in:
Eugen Rochko 2018-07-28 03:33:00 +02:00 • committed by GitHub
parent 3c35b34b61
commit 0fb0037ca7
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4 changed files with 20 additions and 23 deletions
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18
app/javascript/mastodon/utils/resize_image.js
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@ -1,6 +1,6 @@
import EXIF from 'exif-js';
const MAX_IMAGE_DIMENSION = 1280;
const MAX_IMAGE_PIXELS = 1638400; // 1280x1280px
const getImageUrl = inputFile => new Promise((resolve, reject) => {
if (window.URL && URL.createObjectURL) {
@ -73,18 +73,8 @@ const processImage = (img, { width, height, orientation, type = 'image/png' }) =
const resizeImage = (img, type = 'image/png') => new Promise((resolve, reject) => {
const { width, height } = img;
let newWidth, newHeight;
if (width > height) {
newHeight = height * MAX_IMAGE_DIMENSION / width;
newWidth = MAX_IMAGE_DIMENSION;
} else if (height > width) {
newWidth = width * MAX_IMAGE_DIMENSION / height;
newHeight = MAX_IMAGE_DIMENSION;
} else {
newWidth = MAX_IMAGE_DIMENSION;
newHeight = MAX_IMAGE_DIMENSION;
}
const newWidth = Math.round(Math.sqrt(MAX_IMAGE_PIXELS * (width / height)));
const newHeight = Math.round(Math.sqrt(MAX_IMAGE_PIXELS * (height / width)));
getOrientation(img, type)
.then(orientation => processImage(img, {
@ -104,7 +94,7 @@ export default inputFile => new Promise((resolve, reject) => {
}
loadImage(inputFile).then(img => {
if (img.width < MAX_IMAGE_DIMENSION && img.height < MAX_IMAGE_DIMENSION) {
if (img.width * img.height < MAX_IMAGE_PIXELS) {
resolve(inputFile);
return;
}