Histogram TypedArray support

src/lib/array.js

@@ -0,0 +1,134 @@
+/**
+* Copyright 2012-2018, Plotly, Inc.
+* All rights reserved.
+*
+* This source code is licensed under the MIT license found in the
+* LICENSE file in the root directory of this source tree.
+*/
+
+'use strict';
+
+var isArray = Array.isArray;
+
+// IE9 fallbacks
+
+var ab = (typeof ArrayBuffer === 'undefined' || !ArrayBuffer.isView) ?
+    {isView: function() { return false; }} :
+    ArrayBuffer;
+
+var dv = (typeof DataView === 'undefined') ?
+    function() {} :
+    DataView;
+
+function isTypedArray(a) {
+    return ab.isView(a) && !(a instanceof dv);
+}
+exports.isTypedArray = isTypedArray;
+
+function isArrayOrTypedArray(a) {
+    return isArray(a) || isTypedArray(a);
+}
+exports.isArrayOrTypedArray = isArrayOrTypedArray;
+
+/*
+ * Test whether an input object is 1D.
+ *
+ * Assumes we already know the object is an array.
+ *
+ * Looks only at the first element, if the dimensionality is
+ * not consistent we won't figure that out here.
+ */
+function isArray1D(a) {
+    return !isArrayOrTypedArray(a[0]);
+}
+exports.isArray1D = isArray1D;
+
+/*
+ * Ensures an array has the right amount of storage space. If it doesn't
+ * exist, it creates an array. If it does exist, it returns it if too
+ * short or truncates it in-place.
+ *
+ * The goal is to just reuse memory to avoid a bit of excessive garbage
+ * collection.
+ */
+exports.ensureArray = function(out, n) {
+    // TODO: typed array support here? This is only used in
+    // traces/carpet/compute_control_points
+    if(!isArray(out)) out = [];
+
+    // If too long, truncate. (If too short, it will grow
+    // automatically so we don't care about that case)
+    out.length = n;
+
+    return out;
+};
+
+/*
+ * TypedArray-compatible concatenation of n arrays
+ * if all arrays are the same type it will preserve that type,
+ * otherwise it falls back on Array.
+ * Also tries to avoid copying, in case one array has zero length
+ * But never mutates an existing array
+ */
+exports.concat = function() {
+    var args = [];
+    var allArray = true;
+    var totalLen = 0;
+
+    var _constructor, arg0, i, argi, posi, leni, out, j;
+
+    for(i = 0; i < arguments.length; i++) {
+        argi = arguments[i];
+        leni = argi.length;
+        if(leni) {
+            if(arg0) args.push(argi);
+            else {
+                arg0 = argi;
+                posi = leni;
+            }
+
+            if(isArray(argi)) {
+                _constructor = false;
+            }
+            else {
+                allArray = false;
+                if(!totalLen) {
+                    _constructor = argi.constructor;
+                }
+                else if(_constructor !== argi.constructor) {
+                    // TODO: in principle we could upgrade here,
+                    // ie keep typed array but convert all to Float64Array?
+                    _constructor = false;
+                }
+            }
+
+            totalLen += leni;
+        }
+    }
+
+    if(!totalLen) return [];
+    if(!args.length) return arg0;
+
+    if(allArray) return arg0.concat.apply(arg0, args);
+    if(_constructor) {
+        // matching typed arrays
+        out = new _constructor(totalLen);
+        out.set(arg0);
+        for(i = 0; i < args.length; i++) {
+            argi = args[i];
+            out.set(argi, posi);
+            posi += argi.length;
+        }
+        return out;
+    }
+
+    // mismatched types or Array + typed
+    out = new Array(totalLen);
+    for(j = 0; j < arg0.length; j++) out[j] = arg0[j];
+    for(i = 0; i < args.length; i++) {
+        argi = args[i];
+        for(j = 0; j < argi.length; j++) out[posi + j] = argi[j];
+        posi += j;
+    }
+    return out;
+};

src/lib/coerce.js

@@ -19,7 +19,7 @@ var nestedProperty = require('./nested_property');
 var counterRegex = require('./regex').counter;
 var DESELECTDIM = require('../constants/interactions').DESELECTDIM;
 var modHalf = require('./mod').modHalf;
-var isArrayOrTypedArray = require('./is_array').isArrayOrTypedArray;
+var isArrayOrTypedArray = require('./array').isArrayOrTypedArray;
 
 exports.valObjectMeta = {
     data_array: {

src/lib/gl_format_color.js

@@ -15,7 +15,7 @@ var rgba = require('color-normalize');
 
 var Colorscale = require('../components/colorscale');
 var colorDflt = require('../components/color/attributes').defaultLine;
-var isArrayOrTypedArray = require('./is_array').isArrayOrTypedArray;
+var isArrayOrTypedArray = require('./array').isArrayOrTypedArray;
 
 var colorDfltRgba = rgba(colorDflt);
 var opacityDflt = 1;

src/lib/index.js

@@ -24,17 +24,18 @@ lib.relativeAttr = require('./relative_attr');
 lib.isPlainObject = require('./is_plain_object');
 lib.toLogRange = require('./to_log_range');
 lib.relinkPrivateKeys = require('./relink_private');
-lib.ensureArray = require('./ensure_array');
+
+var arrayModule = require('./array');
+lib.isTypedArray = arrayModule.isTypedArray;
+lib.isArrayOrTypedArray = arrayModule.isArrayOrTypedArray;
+lib.isArray1D = arrayModule.isArray1D;
+lib.ensureArray = arrayModule.ensureArray;
+lib.concat = arrayModule.concat;
 
 var modModule = require('./mod');
 lib.mod = modModule.mod;
 lib.modHalf = modModule.modHalf;
 
-var isArrayModule = require('./is_array');
-lib.isTypedArray = isArrayModule.isTypedArray;
-lib.isArrayOrTypedArray = isArrayModule.isArrayOrTypedArray;
-lib.isArray1D = isArrayModule.isArray1D;
-
 var coerceModule = require('./coerce');
 lib.valObjectMeta = coerceModule.valObjectMeta;
 lib.coerce = coerceModule.coerce;

src/lib/nested_property.js

@@ -10,7 +10,7 @@
 'use strict';
 
 var isNumeric = require('fast-isnumeric');
-var isArrayOrTypedArray = require('./is_array').isArrayOrTypedArray;
+var isArrayOrTypedArray = require('./array').isArrayOrTypedArray;
 
 /**
  * convert a string s (such as 'xaxis.range[0]')

src/lib/relink_private.js

@@ -9,7 +9,7 @@
 
 'use strict';
 
-var isArrayOrTypedArray = require('./is_array').isArrayOrTypedArray;
+var isArrayOrTypedArray = require('./array').isArrayOrTypedArray;
 var isPlainObject = require('./is_plain_object');
 
 /**

src/lib/stats.js

@@ -10,7 +10,7 @@
 'use strict';
 
 var isNumeric = require('fast-isnumeric');
-var isArrayOrTypedArray = require('./is_array').isArrayOrTypedArray;
+var isArrayOrTypedArray = require('./array').isArrayOrTypedArray;
 
 /**
  * aggNums() returns the result of an aggregate function applied to an array of

src/traces/histogram/calc.js

@@ -252,7 +252,7 @@ function calcAllAutoBins(gd, trace, pa, mainData, _overlayEdgeCase) {
         for(i = 0; i < traces.length; i++) {
             tracei = traces[i];
             pos0 = tracei._pos0 = pa.makeCalcdata(tracei, mainData);
-            allPos = allPos.concat(pos0);
+            allPos = Lib.concat(allPos, pos0);
             delete tracei._autoBinFinished;
             if(trace.visible === true) {
                 if(isFirstVisible) {

test/jasmine/tests/histogram_test.js

@@ -536,6 +536,16 @@ describe('Test histogram', function() {
             expect(calcPositions(trace3)).toBeCloseToArray([1.1, 1.3], 5);
         });
 
+        it('can handle TypedArrays', function() {
+            var trace1 = {x: new Float32Array([1, 2, 3, 4])};
+            var trace2 = {x: new Float32Array([5, 5.5, 6, 6.5])};
+            var trace3 = {x: new Float64Array([1, 1.1, 1.2, 1.3]), xaxis: 'x2'};
+            var trace4 = {x: new Float64Array([1, 1.2, 1.4, 1.6]), yaxis: 'y2'};
+
+            expect(calcPositions(trace1, [trace2, trace3, trace4])).toEqual([1, 3, 5]);
+            expect(calcPositions(trace3)).toBeCloseToArray([1.1, 1.3], 5);
+        });
+
         describe('cumulative distribution functions', function() {
             var base = {
                 x: [0, 5, 10, 15, 5, 10, 15, 10, 15, 15],

test/jasmine/tests/lib_test.js

@@ -2459,6 +2459,88 @@ describe('Test lib.js:', function() {
             expect(toContainer).toEqual(expected);
         });
     });
+
+    describe('concat', function() {
+        var concat = Lib.concat;
+
+        beforeEach(function() {
+            spyOn(Array.prototype, 'concat').and.callThrough();
+        });
+
+        it('works with multiple Arrays', function() {
+            var res = concat([1], [[2], 3], [{a: 4}, 5, 6]);
+            expect(Array.prototype.concat.calls.count()).toBe(1);
+
+            // note: can't `concat` in the `expect` if we want to count native
+            // `Array.concat calls`, because `toEqual` calls `Array.concat`
+            // profusely itself.
+            expect(res).toEqual([1, [2], 3, {a: 4}, 5, 6]);
+        });
+
+        it('works with some empty arrays', function() {
+            var a1 = [1];
+            var res = concat(a1, [], [2, 3]);
+            expect(Array.prototype.concat.calls.count()).toBe(1);
+            expect(res).toEqual([1, 2, 3]);
+            expect(a1).toEqual([1]); // did not mutate a1
+
+            Array.prototype.concat.calls.reset();
+            var a1b = concat(a1, []);
+            var a1c = concat([], a1b);
+            var a1d = concat([], a1c, []);
+            expect(Array.prototype.concat.calls.count()).toBe(0);
+
+            expect(a1d).toEqual([1]);
+            // does not mutate a1, but *will* return it unchanged if it's the
+            // only one with data
+            expect(a1d).toBe(a1);
+
+            expect(concat([], [0], [1, 0], [2, 0, 0])).toEqual([0, 1, 0, 2, 0, 0]);
+
+            // a single typedArray will keep its identity (and type)
+            // even if other empty arrays don't match type.
+            var f1 = new Float32Array([1, 2]);
+            Array.prototype.concat.calls.reset();
+            res = concat([], f1, new Float64Array([]));
+            expect(Array.prototype.concat.calls.count()).toBe(0);
+            expect(res).toBe(f1);
+            expect(f1).toEqual(new Float32Array([1, 2]));
+        });
+
+        it('works with all empty arrays', function() {
+            [[], [[]], [[], []], [[], [], [], []]].forEach(function(empties) {
+                Array.prototype.concat.calls.reset();
+                var res = concat.apply(null, empties);
+                expect(Array.prototype.concat.calls.count()).toBe(0);
+                expect(res).toEqual([]);
+            });
+        });
+
+        it('converts mismatched types to Array', function() {
+            [
+                [[1, 2], new Float64Array([3, 4])],
+                [new Float64Array([1, 2]), [3, 4]],
+                [new Float64Array([1, 2]), new Float32Array([3, 4])]
+            ].forEach(function(mismatch) {
+                Array.prototype.concat.calls.reset();
+                var res = concat.apply(null, mismatch);
+                // no concat - all entries moved over individually
+                expect(Array.prototype.concat.calls.count()).toBe(0);
+                expect(res).toEqual([1, 2, 3, 4]);
+            });
+        });
+
+        it('concatenates matching TypedArrays preserving type', function() {
+            [Float32Array, Float64Array, Int16Array, Int32Array].forEach(function(Type, i) {
+                var v = i * 10;
+                Array.prototype.concat.calls.reset();
+                var res = concat([], new Type([v]), new Type([v + 1, v]), new Type([v + 2, v, v]));
+                // no concat - uses `TypedArray.set`
+                expect(Array.prototype.concat.calls.count()).toBe(0);
+                expect(res).toEqual(new Type([v, v + 1, v, v + 2, v, v]));
+            });
+        });
+    });
 });
 
 describe('Queue', function() {