Bring back brush caching

app/assets/javascripts/player/brush.js.coffee

@@ -1,4 +1,9 @@
 class AsciiIo.Brush
+  @cache: {}
+
+  @clearCache: ->
+    @cache = {}
+
   @defaultAttrs =
     fg       : undefined
     bg       : undefined
@@ -8,11 +13,21 @@ class AsciiIo.Brush
     underline: false
 
   @default: ->
-    @_default ||= new AsciiIo.Brush()
+    @_default ||= @create()
 
   @hash: (brush) ->
     "#{brush.fg}_#{brush.bg}_#{brush.bright}_#{brush.underline}_#{brush.italic}_#{brush.blink}"
 
+  @create: (options = {}) ->
+    key = @hash options
+    brush = @cache[key]
+
+    if not brush
+      brush = new AsciiIo.Brush(options)
+      @cache[key] = brush
+
+    brush
+
   constructor: (options = {}) ->
     _(this).extend AsciiIo.Brush.defaultAttrs, options
 

app/assets/javascripts/player/views/renderers/canvas.js.coffee

@@ -38,7 +38,7 @@ class AsciiIo.Renderer.Canvas extends AsciiIo.Renderer.Base
     for fragment in fragments
       [text, brush] = fragment
 
-      brush = new AsciiIo.Brush(brush) if brush
+      brush = AsciiIo.Brush.create brush if brush
 
       if cursorX isnt undefined and rendered <= cursorX < rendered + text.length
         @cursorBrush = brush

app/assets/javascripts/player/views/renderers/pre.js.coffee

@@ -58,7 +58,7 @@ class AsciiIo.Renderer.Pre extends AsciiIo.Renderer.Base
     text.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;')
 
   spanFromBrush: (brush) ->
-    brush = new AsciiIo.Brush brush
+    brush = AsciiIo.Brush.create brush
 
     key = brush.hash()
     span = @cachedSpans[key]

app/assets/javascripts/player/vt/screen_buffer.js.coffee

@@ -246,7 +246,7 @@ class AsciiIo.ScreenBuffer
 
   updateBrush: (changes) ->
     attrs = _.extend({}, @brush.attributes(), changes)
-    @brush = new AsciiIo.Brush attrs
+    @brush = AsciiIo.Brush.create attrs
 
   # ----- Scroll control