Move drawing of QR file onto Tegaki canvas into 4chan X so it is less likely to be affected by ad blocking.

src/Posting/QR.coffee

@@ -94,6 +94,7 @@ QR =
       $.prepend navLinksBot, linkBot if (navLinksBot = $ '.navLinksBot')
 
     $.on d, 'QRGetFile',          QR.getFile
+    $.on d, 'QRDrawFile',         QR.drawFile
     $.on d, 'QRSetFile',          QR.setFile
 
     $.on d, 'paste',              QR.paste
@@ -349,6 +350,17 @@ QR =
   getFile: ->
     $.event 'QRFile', QR.selected?.file
 
+  drawFile: (e) ->
+    file = QR.selected?.file
+    return unless file and /^(image|video)\//.test(file.type)
+    isVideo = /^video\//.test file
+    el = $.el (if isVideo then 'video' else 'img')
+    $.on el, 'error', -> QR.error 'Could not open file.'
+    $.on el, (if isVideo then 'loadeddata' else 'load'), ->
+      e.target.getContext('2d').drawImage el, 0, 0
+      URL.revokeObjectURL el.src
+    el.src = URL.createObjectURL file
+
   setFile: (e) ->
     {file, name, source} = e.detail
     file.name   = name   if name?

src/Posting/QR.oekaki.coffee

@@ -122,30 +122,28 @@ QR.oekaki =
           detail: {type: 'warning', content, lifetime: 20}
         }
       cb = (e) ->
-        document.removeEventListener 'QRFile', cb, false
-        return error 'No file to edit.' unless e.detail
-        return error 'Not an image.'    unless /^(image|video)\//.test e.detail.type
-        isVideo = /^video\//.test e.detail.type
-        file = document.createElement(if isVideo then 'video' else 'img')
-        file.addEventListener 'error', -> error 'Could not open file.', false
-        file.addEventListener (if isVideo then 'loadeddata' else 'load'), ->
-          Tegaki.destroy() if Tegaki.bg
-          FCX.oekakiName = name
-          Tegaki.open
-            onDone: FCX.oekakiCB
-            onCancel: -> Tegaki.bgColor = '#ffffff'
-            width:  file.naturalWidth  or file.videoWidth
-            height: file.naturalHeight or file.videoHeight
-            bgColor: 'transparent'
-          Tegaki.activeCtx.drawImage file, 0, 0
-        , false
-        file.src = URL.createObjectURL e.detail
+        @removeEventListener('QRMetadata', cb, false) if e
+        selected = document.getElementById 'selected'
+        return error 'No file to edit.'        unless selected?.dataset.type
+        return error 'Not an image.'           unless /^(image|video)\//.test selected.dataset.type
+        return error 'Metadata not available.' unless selected.dataset.height
+        if selected.dataset.height is 'loading'
+          selected.addEventListener('QRMetadata', cb, false)
+          return
+        Tegaki.destroy() if Tegaki.bg
+        FCX.oekakiName = name
+        Tegaki.open
+          onDone: FCX.oekakiCB
+          onCancel: -> Tegaki.bgColor = '#ffffff'
+          width:  +selected.dataset.width
+          height: +selected.dataset.height
+          bgColor: 'transparent'
+        Tegaki.activeCtx.canvas.dispatchEvent new CustomEvent 'QRDrawFile', {bubbles: true}
       if Tegaki.bg and Tegaki.onDoneCb is FCX.oekakiCB and source is FCX.oekakiLatest
         FCX.oekakiName = name
         Tegaki.resume()
       else
-        document.addEventListener 'QRFile', cb, false
-        document.dispatchEvent new CustomEvent 'QRGetFile', {bubbles: true}
+        cb()
 
   toggle: ->
     QR.oekaki.load ->

src/Posting/QR.post.coffee

@@ -239,11 +239,16 @@ QR.post = class
       $.off el, 'error', onerror
       @checkDimensions el
       @setThumbnail el
+      $.event 'QRMetadata', null, @nodes.el
     onerror = =>
       $.off el, event, onload
       $.off el, 'error', onerror
       @fileError "Corrupt #{if isVideo then 'video' else 'image'} or error reading metadata.", '<%= meta.faq %>#error-reading-metadata'
       URL.revokeObjectURL el.src
+      # XXX https://bugzilla.mozilla.org/show_bug.cgi?id=1021289
+      @nodes.el.removeAttribute 'data-height'
+      $.event 'QRMetadata', null, @nodes.el
+    @nodes.el.dataset.height = 'loading'
     $.on el, event, onload
     $.on el, 'error', onerror
     el.src = URL.createObjectURL @file