Use img.decode() (#473)

* remove will-change:transform from container

* WIP: use img.decode()

* more work on img.decode

routes/_components/Avatar.html

@@ -1,13 +1,15 @@
 {#if error}
-<svg class={computedClass} aria-hidden="true">
+<svg class={computedClass} style={svgStyle} aria-hidden="true">
   <use xlink:href="#fa-user" />
 </svg>
 {:elseif $autoplayGifs}
-  <img
-    class={computedClass}
-    aria-hidden="true"
+  <LazyImage
+    className={computedClass}
+    ariaHidden="true"
     alt=""
     src={account.avatar}
+    {width}
+    {height}
     on:imgLoad="set({loaded: true})"
     on:imgLoadError="set({error: true})" />
 {:else}
@@ -17,6 +19,8 @@
     alt=""
     src={account.avatar}
     staticSrc={account.avatar_static}
+    {width}
+    {height}
     {isLink}
     on:imgLoad="set({loaded: true})"
     on:imgLoadError="set({error: true})"
@@ -32,48 +36,17 @@
     background: none;
   }
 
-  :global(.avatar.size-extra-small) {
-    width: 24px;
-    height: 24px;
-  }
-
-  :global(.avatar.size-small) {
-    width: 48px;
-    height: 48px;
-  }
-
-  :global(.avatar.size-medium) {
-    width: 64px;
-    height: 64px;
-  }
-
-  :global(.avatar.size-big) {
-    width: 100px;
-    height: 100px;
-  }
-
-  @media (max-width: 767px) {
-    :global(.avatar.size-big) {
-      width: 80px;
-      height: 80px;
-    }
-  }
-
   svg.avatar {
     fill: var(--deemphasized-text-color);
   }
 </style>
 <script>
-  import { imgLoad, imgLoadError } from '../_utils/events'
   import { store } from '../_store/store'
   import NonAutoplayImg from './NonAutoplayImg.html'
   import { classname } from '../_utils/classname'
+  import LazyImage from './LazyImage.html'
 
   export default {
-    events: {
-      imgLoad,
-      imgLoadError
-    },
     data: () => ({
       className: void 0,
       loaded: false,
@@ -82,15 +55,30 @@
     }),
     store: () => store,
     computed: {
-      computedClass: ({ className, loaded, size }) => (classname(
+      computedClass: ({ className, loaded }) => (classname(
         'avatar',
         className,
-        loaded && 'loaded',
-        `size-${size}`
-      ))
+        loaded && 'loaded'
+      )),
+      width: ({ size, $isMobileSize }) => {
+        switch (size) {
+          case 'extra-small':
+            return 24
+          case 'small':
+            return 48
+          case 'big':
+            return $isMobileSize ? 80 : 100
+          case 'medium':
+          default:
+            return 64
+        }
+      },
+      height: ({ width }) => width,
+      svgStyle: ({ width, height }) => `width: ${width}px; height: ${height}px;`
     },
     components: {
-      NonAutoplayImg
+      NonAutoplayImg,
+      LazyImage
     }
   }
 </script>

routes/_components/LazyImage.html

@@ -1,14 +1,13 @@
-<div class="lazy-image"
-     style="width: {width}px; height: {height}px; background: {background};">
+<div class="lazy-image" style={computedStyle} >
   {#if displaySrc}
     <img
-      class="{hidden ? 'hidden' : ''} {className || ''}"
-      aria-hidden={ariaHidden || ''}
-      alt={alt || ''}
-      title={alt || ''}
-      src={displaySrc}
+      class={className}
+      aria-hidden={ariaHidden}
+      {alt}
+      {title}
       {width}
       {height}
+      src={displaySrc}
     />
   {/if}
 </div>
@@ -16,40 +15,45 @@
   .lazy-image {
     overflow: hidden;
   }
-  .lazy-image img {
-    transition: opacity 0.2s linear;
-  }
 </style>
 <script>
   import { mark, stop } from '../_utils/marks'
+  import { decodeImage } from '../_utils/decodeImage'
 
   export default {
-    oncreate () {
+    async oncreate () {
       mark('LazyImage oncreate()')
-      let img = new Image()
-      let { src } = this.get()
-      let { fallback } = this.get()
-      img.onload = () => {
-        requestAnimationFrame(() => {
-          this.set({
-            displaySrc: src,
-            hidden: true
-          })
-          requestAnimationFrame(() => {
-            this.set({hidden: false})
-          })
-        })
+      let { src, fallback } = this.get()
+      try {
+        await decodeImage(src)
+        this.set({ displaySrc: src })
+      } catch (e) {
+        if (fallback) {
+          this.set({displaySrc: fallback})
+        }
       }
-      img.onerror = () => {
-        this.set({displaySrc: fallback})
-      }
-      img.src = src
       stop('LazyImage oncreate()')
     },
     data: () => ({
       displaySrc: void 0,
       hidden: false,
-      ariaHidden: false
-    })
+      fallback: void 0,
+      background: '',
+      width: void 0,
+      height: void 0,
+      className: '',
+      ariaHidden: '',
+      alt: '',
+      title: ''
+    }),
+    computed: {
+      computedStyle: ({width, height, background}) => {
+        return [
+          width && `width: ${width}px;`,
+          height && `height: ${height}px;`,
+          background && `background: ${background};`
+        ].filter(Boolean).join('')
+      }
+    }
   }
 </script>

routes/_components/NonAutoplayImg.html

@@ -1,22 +1,13 @@
-{#if staticSrc === src}
-  <img class={className || ''}
-       aria-hidden={ariaHidden}
-       alt={alt || ''}
-       title={alt || ''}
-       {src}
-       on:imgLoad
-       on:imgLoadError />
-{:else}
-  <img class="{className || ''} non-autoplay-zoom-in {isLink ? 'is-link' : ''}"
-       aria-hidden={ariaHidden}
-       alt={alt || ''}
-       title={alt || ''}
-       src={staticSrc}
-       on:imgLoad
-       on:imgLoadError
-       on:mouseover="onMouseOver(event)"
-       ref:node />
-{/if}
+<img
+  class={computedClass}
+  aria-hidden={ariaHidden}
+  {alt}
+  {title}
+  {width}
+  {height}
+  src={displaySrc}
+  on:mouseover="onMouseOver(event)"
+/>
 <style>
   .non-autoplay-zoom-in {
     cursor: zoom-in;
@@ -26,18 +17,44 @@
   }
 </style>
 <script>
-  import { imgLoad, imgLoadError, mouseover } from '../_utils/events'
+  import { mouseover } from '../_utils/events'
+  import { decodeImage } from '../_utils/decodeImage'
+  import { ONE_TRANSPARENT_PIXEL } from '../_static/media'
+  import { classname } from '../_utils/classname'
+
   export default {
+    async oncreate () {
+      let { staticSrc } = this.get()
+      try {
+        await decodeImage(staticSrc)
+        this.set({ displaySrc: staticSrc })
+        this.fire('imgLoad')
+      } catch (e) {
+        this.fire('imgLoadError', e)
+      }
+    },
     methods: {
       onMouseOver (mouseOver) {
-        let { src, staticSrc } = this.get()
-        this.refs.node.src = mouseOver ? src : staticSrc
+        let { src, staticSrc, displaySrc } = this.get()
+        if (displaySrc !== ONE_TRANSPARENT_PIXEL) {
+          this.set({ displaySrc: mouseOver ? src : staticSrc })
+        }
       }
     },
     events: {
-      imgLoad,
-      imgLoadError,
       mouseover
+    },
+    data: () => ({
+      displaySrc: ONE_TRANSPARENT_PIXEL,
+      alt: '',
+      title: ''
+    }),
+    computed: {
+      computedClass: ({className, src, staticSrc, isLink}) => (classname(
+        className,
+        src !== staticSrc && 'non-autoplay-zoom-in',
+        isLink && 'is-link'
+      ))
     }
   }
 </script>

routes/_pages/settings/instances/[instanceName].html

@@ -4,7 +4,9 @@
   {#if verifyCredentials}
     <h2>Logged in as:</h2>
     <div class="acct-current-user">
-      <Avatar account={verifyCredentials} className="acct-avatar" size="big"/>
+      <div class="acct-avatar">
+        <Avatar account={verifyCredentials} size="big"/>
+      </div>
       <ExternalLink className="acct-handle"
                     href={verifyCredentials.url}>
         {'@' + verifyCredentials.acct}

routes/_store/observers/observers.js

@@ -5,6 +5,7 @@ import { onlineObservers } from './onlineObservers'
 import { navObservers } from './navObservers'
 import { autosuggestObservers } from './autosuggestObservers'
 import { pageVisibilityObservers } from './pageVisibilityObservers'
+import { resizeObservers } from './resizeObservers'
 
 export function observers (store) {
   instanceObservers(store)
@@ -14,4 +15,5 @@ export function observers (store) {
   navObservers(store)
   autosuggestObservers(store)
   pageVisibilityObservers(store)
+  resizeObservers(store)
 }

routes/_store/observers/resizeObservers.js

@@ -0,0 +1,14 @@
+import { registerResizeListener } from '../../_utils/resize'
+
+export function resizeObservers (store) {
+  if (!process.browser) {
+    return
+  }
+
+  const recalculateIsMobileSize = () => {
+    store.set({isMobileSize: window.matchMedia('(max-width: 767px)').matches})
+  }
+
+  registerResizeListener(recalculateIsMobileSize)
+  recalculateIsMobileSize()
+}

routes/_utils/decodeImage.js

@@ -0,0 +1,14 @@
+export function decodeImage (src) {
+  if (typeof Image.prototype.decode === 'function') {
+    let img = new Image()
+    img.src = src
+    return img.decode()
+  }
+
+  return new Promise((resolve, reject) => {
+    let img = new Image()
+    img.src = src
+    img.onload = resolve
+    img.onerror = reject
+  })
+}

routes/_utils/events.js

@@ -1,23 +1,3 @@
-export function imgLoadError (node, callback) {
-  node.addEventListener('error', callback)
-
-  return {
-    destroy () {
-      node.removeEventListener('error', callback)
-    }
-  }
-}
-
-export function imgLoad (node, callback) {
-  node.addEventListener('load', callback)
-
-  return {
-    destroy () {
-      node.removeEventListener('load', callback)
-    }
-  }
-}
-
 export function mouseover (node, callback) {
   function onMouseEnter () {
     callback(true) // eslint-disable-line