WIP: Typed array encoding in supplyDefaults with Caching

src/lib/array.js

@@ -7,6 +7,8 @@
 */
 
 'use strict';
+var b64 = require('base64-arraybuffer');
+var isPlainObject = require('./is_plain_object');
 
 var isArray = Array.isArray;
 
@@ -63,6 +65,112 @@ exports.ensureArray = function(out, n) {
     return out;
 };
 
+var typedArrays = {
+    int8: typeof Int8Array !== 'undefined' ? Int8Array : null,
+    uint8: typeof Uint8Array !== 'undefined' ? Uint8Array : null,
+    uint8clamped: typeof Uint8ClampedArray !== 'undefined' ? Uint8ClampedArray : null,
+    int16: typeof Int16Array !== 'undefined' ? Int16Array : null,
+    uint16: typeof Uint16Array !== 'undefined' ? Uint16Array : null,
+    int32: typeof Int32Array !== 'undefined' ? Int32Array : null,
+    uint32: typeof Uint32Array !== 'undefined' ? Uint32Array : null,
+    float32: typeof Float32Array !== 'undefined' ? Float32Array : null,
+    float64: typeof Float64Array !== 'undefined' ? Float64Array : null,
+};
+exports.typedArrays = typedArrays;
+
+
+exports.decodeTypedArraySpec = function(v) {
+    // Assume processed by coerceTypedArraySpec
+    v = coerceTypedArraySpec(v);
+    var T = typedArrays[v.dtype];
+    var buffer;
+    if(v.bvals.constructor === ArrayBuffer) {
+        // Already an ArrayBuffer
+        buffer = v.bvals;
+    } else {
+        // Decode, assuming a string
+        buffer = b64.decode(v.bvals);
+    }
+
+    // Check if 1d shape. If so, we're done
+    if(v.ndims === 1) {
+        // Construct single Typed array over entire buffer
+        return new T(buffer);
+    } else {
+        // Reshape into nested plain arrays with innermost
+        // level containing typed arrays
+        // We could eventually adopt an ndarray library
+
+        // Build cumulative product of dimensions
+        var cumulativeShape = v.shape.map(function(a, i) {
+            return a * (v.shape[i - 1] || 1);
+        });
+
+        // Loop of dimensions in reverse order
+        var nestedArray = [];
+        for(var dimInd = v.ndims - 1; dimInd > 0; dimInd--) {
+            var subArrayLength = v.shape[dimInd];
+            var numSubArrays = cumulativeShape[dimInd - 1];
+            var nextArray = [];
+
+            if(dimInd === v.ndims - 1) {
+                // First time through, we build the
+                // inner most typed arrays
+                for(var typedInd = 0; typedInd < numSubArrays; typedInd++) {
+                    var typedOffset = typedInd * subArrayLength;
+                    nextArray.push(
+                        new T(buffer, typedOffset * T.BYTES_PER_ELEMENT, subArrayLength)
+                    );
+                }
+            } else {
+                // Following times through, build
+                // next layer of nested arrays
+                for(var i = 0; i < numSubArrays; i++) {
+                    var offset = i * subArrayLength;
+                    nextArray.push(nextArray.slice(offset, offset + subArrayLength - 1));
+                }
+            }
+
+            // Update nested array with next nesting level
+            nestedArray = nextArray;
+        }
+
+        return nestedArray;
+    }
+};
+
+function isTypedArraySpec(v) {
+    // Assume v has not passed through
+    return isPlainObject(v) && typedArrays[v.dtype] && v.bvals && (
+        Number.isInteger(v.shape) ||
+        (isArrayOrTypedArray(v.shape) &&
+            v.shape.length > 0 &&
+            v.shape.every(function(d) { return Number.isInteger(d); }))
+    );
+}
+exports.isTypedArraySpec = isTypedArraySpec;
+
+function coerceTypedArraySpec(v) {
+    // Assume isTypedArraySpec passed
+    var coerced = {dtype: v.dtype, bvals: v.bvals};
+
+    // Normalize shape to a list
+    if(Number.isInteger(v.shape)) {
+        coerced.shape = [v.shape];
+    } else {
+        coerced.shape = v.shape;
+    }
+
+    // Add length property
+    coerced.length = v.shape.reduce(function(a, b) { return a * b; });
+
+    // Add ndims
+    coerced.ndims = v.shape.length;
+
+    return coerced;
+}
+exports.coerceTypedArraySpec = coerceTypedArraySpec;
+
 /*
  * TypedArray-compatible concatenation of n arrays
  * if all arrays are the same type it will preserve that type,

src/lib/coerce.js

@@ -18,22 +18,11 @@ var DESELECTDIM = require('../constants/interactions').DESELECTDIM;
 var nestedProperty = require('./nested_property');
 var counterRegex = require('./regex').counter;
 var modHalf = require('./mod').modHalf;
-var isPlainObject = require('./is_plain_object');
 var isArrayOrTypedArray = require('./array').isArrayOrTypedArray;
+var isTypedArraySpec = require('./array').isTypedArraySpec;
+var decodeTypedArraySpec = require('./array').decodeTypedArraySpec;
+var coerceTypedArraySpec = require('./array').coerceTypedArraySpec;
 
-var typedArrays = {
-    int8: typeof Int8Array !== 'undefined' ? 1 : 0,
-    uint8: typeof Uint8Array !== 'undefined' ? 1 : 0,
-    uint8clamped: typeof Uint8ClampedArray !== 'undefined' ? 1 : 0,
-    int16: typeof Int16Array !== 'undefined' ? 1 : 0,
-    uint16: typeof Uint16Array !== 'undefined' ? 1 : 0,
-    int32: typeof Int32Array !== 'undefined' ? 1 : 0,
-    uint32: typeof Uint32Array !== 'undefined' ? 1 : 0,
-    float32: typeof Float32Array !== 'undefined' ? 1 : 0,
-    float64: typeof Float64Array !== 'undefined' ? 1 : 0,
-    bigint64: typeof BigInt64Array !== 'undefined' ? 1 : 0,
-    biguint64: typeof BigUint64Array !== 'undefined' ? 1 : 0
-};
 
 exports.valObjectMeta = {
     data_array: {
@@ -53,12 +42,45 @@ exports.valObjectMeta = {
             if(isArrayOrTypedArray(v)) {
                 propOut.set(v);
                 wasSet = true;
-            } else if(isPlainObject(v)) {
-                var T = typedArrays[v.dtype];
-                if(T) {
-                    propOut.set(v);
-                    wasSet = true;
+            } else if(isTypedArraySpec(v)) {
+                // Copy and coerce spec
+                v = coerceTypedArraySpec(v);
+
+                // See if caching location is available
+                var uid = propOut.obj.uid;
+                var module = propOut.obj._module;
+
+                if(v.bvals.constructor === ArrayBuffer || !uid || !module) {
+                    // Already an ArrayBuffer
+                    // decoding is cheap
+                    propOut.set(decodeTypedArraySpec(v));
+                } else {
+                    var prop = propOut.astr;
+                    var cache = module._b64BufferCache || {};
+
+                    // Check cache
+                    var cachedBuffer = ((cache[uid] || {})[prop] || {})[v.bvals];
+                    if(cachedBuffer !== undefined) {
+                        // Use cached array buffer instead of base64 encoded
+                        // string
+                        v.bvals = cachedBuffer;
+                        propOut.set(decodeTypedArraySpec(v));
+                    } else {
+                        // Not in so cache decode
+                        var decoded = decodeTypedArraySpec(v);
+                        propOut.set(decoded);
+
+                        // Update cache for next time
+                        cache[uid] = (cache[uid] || {});
+
+                        // Clear any prior cache value (only store one per
+                        // trace property
+                        cache[uid][prop] = {};
+                        cache[uid][prop][v.bvals] = decoded.buffer;
+                        module._b64BufferCache = cache;
+                    }
                 }
+                wasSet = true;
             }
             if(!wasSet && dflt !== undefined) propOut.set(dflt);
         }

src/plots/plots.js

@@ -11,7 +11,6 @@
 var d3 = require('d3');
 var timeFormatLocale = require('d3-time-format').timeFormatLocale;
 var isNumeric = require('fast-isnumeric');
-var b64 = require('base64-arraybuffer');
 
 var Registry = require('../registry');
 var PlotSchema = require('../plot_api/plot_schema');
@@ -2849,50 +2848,7 @@ function _transition(gd, transitionOpts, opts) {
     return transitionStarting.then(function() { return gd; });
 }
 
-var typedArrays = {
-    int8: typeof Int8Array !== 'undefined' ? Int8Array : null,
-    uint8: typeof Uint8Array !== 'undefined' ? Uint8Array : null,
-    uint8clamped: typeof Uint8ClampedArray !== 'undefined' ? Uint8ClampedArray : null,
-    int16: typeof Int16Array !== 'undefined' ? Int16Array : null,
-    uint16: typeof Uint16Array !== 'undefined' ? Uint16Array : null,
-    int32: typeof Int32Array !== 'undefined' ? Int32Array : null,
-    uint32: typeof Uint32Array !== 'undefined' ? Uint32Array : null,
-    float32: typeof Float32Array !== 'undefined' ? Float32Array : null,
-    float64: typeof Float64Array !== 'undefined' ? Float64Array : null,
-    bigint64: typeof BigInt64Array !== 'undefined' ? BigInt64Array : null,
-    biguint64: typeof BigUint64Array !== 'undefined' ? BigUint64Array : null
-};
-
-function _decode(cont) {
-    if(cont.dtype && cont.bvals) {
-        var T = typedArrays[cont.dtype];
-        if(T) {
-            return new T(b64.decode(cont.bvals));
-        }
-    }
-
-    for(var prop in cont) {
-        if(prop[0] !== '_' && cont.hasOwnProperty(prop)) {
-            var item = cont[prop];
-            if(Lib.isPlainObject(item)) {
-                var r = _decode(item);
-                if(r !== undefined) cont[prop] = r;
-            }
-        }
-    }
-}
-
-function decodeB64Arrays(gd) {
-    for(var i = 0; i < gd._fullData.length; i++) {
-        _decode(gd._fullData[i]);
-    }
-
-    _decode(gd._fullLayout);
-}
-
 plots.doCalcdata = function(gd, traces) {
-    decodeB64Arrays(gd);
-
     var axList = axisIDs.list(gd);
     var fullData = gd._fullData;
     var fullLayout = gd._fullLayout;

src/traces/heatmap/xyz_defaults.js

@@ -19,25 +19,19 @@ module.exports = function handleXYZDefaults(traceIn, traceOut, coerce, layout, x
     yName = yName || 'y';
     var x, y;
 
-    var shapeX = x ? (x.shape ? x.shape[0] : x.length) || 0 : 0;
-    var shapeY = y ? (y.shape ? y.shape[0] : y.length) || 0 : 0;
-    var shapeZ = z ? (z.shape ? z.shape[0] : z.length) || 0 : 0;
+    if(z === undefined || !z.length) return 0;
 
-    var zlen = shapeZ || (z && z.length) || 0;
-
-    if(z === undefined || !zlen) return 0;
-
-    if(Lib.isArray1D(traceIn.z) || (z && z.shape && z.shape.length === 1)) {
+    if(Lib.isArray1D(z)) {
         x = coerce(xName);
         y = coerce(yName);
 
-        var xlen = shapeX || Lib.minRowLength(x);
-        var ylen = shapeY || Lib.minRowLength(y);
+        var xlen = Lib.minRowLength(x);
+        var ylen = Lib.minRowLength(y);
 
         // column z must be accompanied by xName and yName arrays
         if(xlen === 0 || ylen === 0) return 0;
 
-        traceOut._length = Math.min(xlen, ylen, zlen);
+        traceOut._length = Math.min(xlen, ylen, z.length);
     } else {
         x = coordDefaults(xName, coerce);
         y = coordDefaults(yName, coerce);

src/traces/isosurface/defaults.js

@@ -38,18 +38,12 @@ function supplyIsoDefaults(traceIn, traceOut, defaultColor, layout, coerce) {
     var z = coerce('z');
     var value = coerce('value');
 
-    var len = 0;
-
-    if(x && y && z && value) {
-        len = Math.min(
-            (x.shape ? x.shape[0] : x.length) || 0,
-            (y.shape ? y.shape[0] : y.length) || 0,
-            (z.shape ? z.shape[0] : z.length) || 0,
-            (value.shape ? value.shape[0] : value.length) || 0
-        );
-    }
-
-    if(!len) {
+    if(
+        !x || !x.length ||
+        !y || !y.length ||
+        !z || !z.length ||
+        !value || !value.length
+    ) {
         traceOut.visible = false;
         return;
     }

src/traces/scatter/xy_defaults.js

@@ -19,22 +19,19 @@ module.exports = function handleXYDefaults(traceIn, traceOut, layout, coerce) {
     var handleCalendarDefaults = Registry.getComponentMethod('calendars', 'handleTraceDefaults');
     handleCalendarDefaults(traceIn, traceOut, ['x', 'y'], layout);
 
-    var shapeX = x && x.shape ? x.shape[0] : 0;
-    var shapeY = y && y.shape ? y.shape[0] : 0;
-
     if(x) {
-        var xlen = shapeX || Lib.minRowLength(x);
+        var xlen = Lib.minRowLength(x);
         if(y) {
-            len = shapeY || Math.min(xlen, Lib.minRowLength(y));
+            len = Math.min(xlen, Lib.minRowLength(y));
         } else {
-            len = shapeX || xlen;
+            len = xlen;
             coerce('y0');
             coerce('dy');
         }
     } else {
         if(!y) return 0;
 
-        len = shapeY || Lib.minRowLength(y);
+        len = Lib.minRowLength(y);
         coerce('x0');
         coerce('dx');
     }

src/traces/scatter3d/defaults.js

@@ -78,12 +78,8 @@ function handleXYZDefaults(traceIn, traceOut, coerce, layout) {
     handleCalendarDefaults(traceIn, traceOut, ['x', 'y', 'z'], layout);
 
     if(x && y && z) {
-        var shapeX = (x.shape ? x.shape[0] : x.length) || 0;
-        var shapeY = (y.shape ? y.shape[0] : y.length) || 0;
-        var shapeZ = (z.shape ? z.shape[0] : z.length) || 0;
-
         // TODO: what happens if one is missing?
-        len = Math.min(shapeX, shapeY, shapeZ);
+        len = Math.min(x.length, y.length, z.length);
         traceOut._length = traceOut._xlength = traceOut._ylength = traceOut._zlength = len;
     }