[Glitch] Add option to disable blurhash previews

Port 4b3d91dc2c to glitch-soc

app/javascript/flavours/glitch/components/media_gallery.js

@@ -6,7 +6,7 @@ import IconButton from './icon_button';
 import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
 import { isIOS } from 'flavours/glitch/util/is_mobile';
 import classNames from 'classnames';
-import { autoPlayGif, displayMedia } from 'flavours/glitch/util/initial_state';
+import { autoPlayGif, displayMedia, useBlurhash } from 'flavours/glitch/util/initial_state';
 import { decode } from 'blurhash';
 
 const messages = defineMessages({
@@ -101,6 +101,8 @@ class Item extends React.PureComponent {
   }
 
   _decode () {
+    if (!useBlurhash) return;
+
     const hash   = this.props.attachment.get('blurhash');
     const pixels = decode(hash, 32, 32);
 

app/javascript/flavours/glitch/features/video/index.js

@@ -5,7 +5,7 @@ import { fromJS, is } from 'immutable';
 import { throttle } from 'lodash';
 import classNames from 'classnames';
 import { isFullscreen, requestFullscreen, exitFullscreen } from 'flavours/glitch/util/fullscreen';
-import { displayMedia } from 'flavours/glitch/util/initial_state';
+import { displayMedia, useBlurhash } from 'flavours/glitch/util/initial_state';
 import { decode } from 'blurhash';
 
 const messages = defineMessages({
@@ -312,7 +312,7 @@ export default class Video extends React.PureComponent {
   }
 
   _decode () {
-    if (!this.canvas) return;
+    if (!this.canvas || !useBlurhash) return;
 
     const hash   = this.props.blurhash;
     const pixels = decode(hash, 32, 32);

app/javascript/flavours/glitch/util/initial_state.js

@@ -29,5 +29,6 @@ export const mascot = getMeta('mascot');
 export const isStaff = getMeta('is_staff');
 export const defaultContentType = getMeta('default_content_type');
 export const forceSingleColumn = getMeta('advanced_layout') === false;
+export const useBlurhash = getMeta('use_blurhash');
 
 export default initialState;