Image rendering — GIF support

[DuncanMacWeb]

We need to be able to render GIF images, maybe using omggif like this.

Will create a PR soon.

[mcdeguzman99]

Somewhat related to the issue of adding in GIF support, it looks like images are being decoded twice.

Once in

react-pdf/src/utils/image.js

Line 95 in 9070a77

function getImage(body, extension) {

... and once again here

https://github.com/react-pdf/pdfkit/blob/49f2c5c9a32da0247617fe8ef1e2b52b951327ae/lib/image.js#L10