Add PNG export functions to Node

examples/node/export_layers.js

@@ -6,7 +6,7 @@ var start = new Date();
 PSD.open(file).then(function (psd) {
   psd.tree().descendants().forEach(function (node) {
     if (node.isGroup()) return true;
-    node.layer.image.saveAsPng("./output/" + node.name + ".png").catch(function (err) {
+    node.saveAsPng("./output/" + node.name + ".png").catch(function (err) {
       console.log(err.stack);
     });
   });

lib/psd/node.coffee

@@ -4,7 +4,7 @@ _        = require 'lodash'
 module.exports = class Node extends Module
   @includes require('./nodes/ancestry.coffee')
   @includes require('./nodes/search.coffee')
-  # @includes require('./nodes/build_preview.coffee')
+  @includes require('./nodes/build_preview.coffee')
 
   @PROPERTIES: ['name', 'left', 'right', 'top', 'bottom', 'height', 'width']
 

lib/psd/nodes/build_preview.coffee

+module.exports =
+  toPng: -> @layer.image.toPng()
+  saveAsPng: (output) -> @layer.image.saveAsPng(output)