Address Julian's comments.

src/core.js

@@ -636,10 +636,10 @@ var PDFDoc = (function PDFDocClosure() {
           var size = width * height;
           var rgbaLength = size * 4;
           var buf = new Uint8Array(size * components);
-          var tempCanvas = new ScratchCanvas(width, height);
-          var tempCtx = tempCanvas.getContext('2d');
-          tempCtx.drawImage(img, 0, 0);
-          var data = tempCtx.getImageData(0, 0, width, height).data;
+          var tmpCanvas = new ScratchCanvas(width, height);
+          var tmpCtx = tmpCanvas.getContext('2d');
+          tmpCtx.drawImage(img, 0, 0);
+          var data = tmpCtx.getImageData(0, 0, width, height).data;
 
           if (components == 3) {
             for (var i = 0, j = 0; i < rgbaLength; i += 4, j += 3) {

src/image.js

@@ -84,17 +84,17 @@ var PDFImage = (function PDFImageClosure() {
    */
   PDFImage.buildImage = function buildImage(callback, handler, xref, res,
                                                image, inline) {
-    var promise = new Promise();
+    var imageDataPromise = new Promise();
     var smaskPromise = new Promise();
-    var promises = [promise, smaskPromise];
     // The image data and smask data may not be ready yet, wait till both are
     // resolved.
-    Promise.all(promises).then(function(results) {
-      var image = new PDFImage(xref, res, results[0], inline, results[1]);
+    Promise.all([imageDataPromise, smaskPromise]).then(function(results) {
+      var imageData = results[0], smaskData = results[1];
+      var image = new PDFImage(xref, res, imageData, inline, smaskData);
       callback(image);
     });
 
-    handleImageData(handler, xref, res, image, promise);
+    handleImageData(handler, xref, res, image, imageDataPromise);
 
     var smask = xref.fetchIfRef(image.dict.get('SMask'));
     if (smask)

test/pdfs/aboutstacks.pdf.link

@@ -0,0 +1 @@
+http://greenhousechallenge.org/media/item/313/38/About-Stacks.pdf

test/test_manifest.json

@@ -340,5 +340,13 @@
        "link": true,
        "pageLimit": 3,
        "type": "eq"
+    },
+    {
+      "id": "aboutstacks",
+      "file": "pdfs/aboutstacks.pdf",
+      "md5": "6e7c8416a293ba2d83bc8dd20c6ccf51",
+      "rounds": 1,
+      "link": true,
+      "type": "eq"
     }
 ]