Use individual images in emoji picker rather than a spritesheet

package.json

@@ -276,8 +276,7 @@
       "!node_modules/emoji-datasource/emoji_pretty.json",
       "!node_modules/emoji-datasource/*.png",
       "!node_modules/emoji-datasource-apple/emoji_pretty.json",
-      "!node_modules/emoji-datasource-apple/img/apple/{sheets,sheets-128}/*.png",
-      "!node_modules/emoji-datasource-apple/img/apple/sheets-256/{16,20,32}.png",
+      "!node_modules/emoji-datasource-apple/img/apple/sheets*",
       "!node_modules/spellchecker/vendor/hunspell/**/*",
       "!**/node_modules/*/{CHANGELOG.md,README.md,README,readme.md,readme,test,__tests__,tests,powered-test,example,examples,*.d.ts}",
       "!**/node_modules/.bin",

stylesheets/_modules.scss

@@ -4424,17 +4424,20 @@
 }
 
 // Module: Emoji
-@mixin emoji-size($size, $emoji-sheet-columns: 52) {
+@mixin emoji-size($size) {
   &--#{$size} {
     width: $size;
     height: $size;
-    background-size: $emoji-sheet-columns * $size;
+  }
+  &__image--#{$size} {
+    width: $size;
+    height: $size;
+    transform: translate3d(0, 0, 0);
   }
 }
 
 .module-emoji {
   display: block;
-  background-image: url('../node_modules/emoji-datasource-apple/img/apple/sheets-256/64.png');
 
   @include emoji-size(16px);
   @include emoji-size(20px);

ts/components/conversation/Emojify.tsx

@@ -28,12 +28,19 @@ function getImageTag({
   const result = getReplacementData(match[0], match[1], match[2]);
 
   if (is.string(result)) {
-    return <span key={key}>{match[0]}</span>;
+    return match[0];
   }
 
   const img = findImage(result.value, result.variation);
   const title = getTitle(result.value);
 
+  if (
+    !img.path ||
+    !img.path.startsWith('node_modules/emoji-datasource-apple')
+  ) {
+    return match[0];
+  }
+
   return (
     // tslint:disable-next-line react-a11y-img-has-alt
     <img

ts/components/emoji/Emoji.tsx

@@ -1,6 +1,6 @@
 import * as React from 'react';
 import classNames from 'classnames';
-import { getSheetCoordinates, SkinToneKey } from './lib';
+import { getImagePath, SkinToneKey } from './lib';
 
 export type OwnProps = {
   inline?: boolean;
@@ -18,9 +18,7 @@ export const Emoji = React.memo(
       { style = {}, size = 28, shortName, skinTone, inline, className }: Props,
       ref
     ) => {
-      const [sheetX, sheetY] = getSheetCoordinates(shortName, skinTone);
-      const x = -(size * sheetX);
-      const y = -(size * sheetY);
+      const image = getImagePath(shortName, skinTone);
 
       return (
         <div
@@ -31,12 +29,14 @@ export const Emoji = React.memo(
             inline ? 'module-emoji--inline' : null,
             className
           )}
-          style={{
-            ...style,
-            backgroundPositionX: `${x}px`,
-            backgroundPositionY: `${y}px`,
-          }}
-        />
+          style={style}
+        >
+          <img
+            className={`module-emoji__image--${size}px`}
+            src={image}
+            alt={shortName}
+          />
+        </div>
       );
     }
   )

ts/components/emoji/lib.ts

@@ -18,6 +18,21 @@ export const skinTones = ['1F3FB', '1F3FC', '1F3FD', '1F3FE', '1F3FF'];
 
 export type SkinToneKey = '1F3FB' | '1F3FC' | '1F3FD' | '1F3FE' | '1F3FF';
 
+export type EmojiSkinVariation = {
+  unified: string;
+  non_qualified: null;
+  image: string;
+  sheet_x: number;
+  sheet_y: number;
+  added_in: string;
+  has_img_apple: boolean;
+  has_img_google: boolean;
+  has_img_twitter: boolean;
+  has_img_emojione: boolean;
+  has_img_facebook: boolean;
+  has_img_messenger: boolean;
+};
+
 export type EmojiData = {
   name: string;
   unified: string;
@@ -43,24 +58,36 @@ export type EmojiData = {
   has_img_facebook: boolean;
   has_img_messenger: boolean;
   skin_variations?: {
-    [key: string]: {
-      unified: string;
-      non_qualified: null;
-      image: string;
-      sheet_x: number;
-      sheet_y: number;
-      added_in: string;
-      has_img_apple: boolean;
-      has_img_google: boolean;
-      has_img_twitter: boolean;
-      has_img_emojione: boolean;
-      has_img_facebook: boolean;
-      has_img_messenger: boolean;
-    };
+    [key: string]: EmojiSkinVariation;
   };
 };
 
-const data: Array<EmojiData> = untypedData;
+const data = (untypedData as Array<EmojiData>).filter(
+  emoji => emoji.has_img_apple
+);
+
+const makeImagePath = (src: string) => {
+  return `node_modules/emoji-datasource-apple/img/apple/64/${src}`;
+};
+
+export const images = new Set();
+
+// Preload images
+const preload = (src: string) => {
+  const img = new Image();
+  img.src = src;
+  images.add(img);
+};
+
+data.forEach(emoji => {
+  preload(makeImagePath(emoji.image));
+
+  if (emoji.skin_variations) {
+    Object.values(emoji.skin_variations).forEach(variation => {
+      preload(makeImagePath(variation.image));
+    });
+  }
+});
 
 export const dataByShortName = keyBy(data, 'short_name');
 
@@ -112,20 +139,28 @@ export const dataByCategory = mapValues(
   arr => sortBy(arr, 'sort_order')
 );
 
-export function getSheetCoordinates(
+export function getEmojiData(
   shortName: keyof typeof dataByShortName,
   skinTone?: SkinToneKey | number
-): [number, number] {
+): EmojiData | EmojiSkinVariation {
   const base = dataByShortName[shortName];
 
   if (skinTone && base.skin_variations) {
     const variation = isNumber(skinTone) ? skinTones[skinTone - 1] : skinTone;
-    const { sheet_x, sheet_y } = base.skin_variations[variation];
 
-    return [sheet_x, sheet_y];
+    return base.skin_variations[variation];
   }
 
-  return [base.sheet_x, base.sheet_y];
+  return base;
+}
+
+export function getImagePath(
+  shortName: keyof typeof dataByShortName,
+  skinTone?: SkinToneKey | number
+): string {
+  const { image } = getEmojiData(shortName, skinTone);
+
+  return makeImagePath(image);
 }
 
 const fuse = new Fuse(data, {