handle typed arrays in image trace

Author: archmoj

src/traces/image/hover.js

@@ -2,6 +2,7 @@
 
 var Fx = require('../../components/fx');
 var Lib = require('../../lib');
+var isArrayOrTypedArray = Lib.isArrayOrTypedArray;
 var constants = require('./constants');
 
 module.exports = function hoverPoints(pointData, xval, yval) {
@@ -54,9 +55,9 @@ module.exports = function hoverPoints(pointData, xval, yval) {
     }
 
     var text;
-    if(Array.isArray(trace.hovertext) && Array.isArray(trace.hovertext[ny])) {
+    if(isArrayOrTypedArray(trace.hovertext) && isArrayOrTypedArray(trace.hovertext[ny])) {
         text = trace.hovertext[ny][nx];
-    } else if(Array.isArray(trace.text) && Array.isArray(trace.text[ny])) {
+    } else if(isArrayOrTypedArray(trace.text) && isArrayOrTypedArray(trace.text[ny])) {
         text = trace.text[ny][nx];
     }
 

src/traces/image/plot.js

@@ -186,7 +186,11 @@ module.exports = function plot(gd, plotinfo, cdimage, imageLayer) {
         .then(function() {
             var href, canvas;
             if(trace._hasZ) {
-                canvas = drawMagnifiedPixelsOnCanvas(function(i, j) {return z[j][i];});
+                canvas = drawMagnifiedPixelsOnCanvas(function(i, j) {
+                    var _z = z[j][i];
+                    if(Lib.isTypedArray(_z)) _z = Array.from(_z);
+                    return _z;
+                });
                 href = canvas.toDataURL('image/png');
             } else if(trace._hasSource) {
                 if(realImage) {