Prettify

lib/simplify-wasm/index.js

@@ -14,18 +14,27 @@
 import wasmModuleFactory from './simplify.js'
 import wasmUrl from './simplify.wasm'
 import { initEmscriptenModule } from '../wasm-util/initEmscripten.js'
-import { storeCoords, loadResultAndFreeMemory } from '../wasm-util/coordinates.js'
+import {
+  storeCoords,
+  loadResultAndFreeMemory
+} from '../wasm-util/coordinates.js'
 
 export async function simplifyWasm(coords, tolerance, highestQuality) {
-    const module = await getModule()
-    const buffer = storeCoords(module, coords)
-    const result = module._simplify(buffer, coords.length * 2, tolerance, highestQuality)
-    module._free(buffer)
-    return loadResultAndFreeMemory(module, result) 
+  const module = await getModule()
+  const buffer = storeCoords(module, coords)
+  const result = module._simplify(
+    buffer,
+    coords.length * 2,
+    tolerance,
+    highestQuality
+  )
+  module._free(buffer)
+  return loadResultAndFreeMemory(module, result)
 }
 
 let emscriptenModule
-export async function getModule () {
-    if (!emscriptenModule) emscriptenModule = initEmscriptenModule(wasmModuleFactory, wasmUrl)
-    return await emscriptenModule
+export async function getModule() {
+  if (!emscriptenModule)
+    emscriptenModule = initEmscriptenModule(wasmModuleFactory, wasmUrl)
+  return await emscriptenModule
 }

lib/wasm-util/coordinates.js

@@ -6,28 +6,37 @@
 /**
  * Allocate memory for coordinates and stores them in a flat representation.
  * Returns a pointer to the buffer. The length of the buffer is coords.length * 2
- * @param {*} module 
+ * @param {*} module
  * @param {Array} coords - An array of coordinate pairs
  */
 export function storeCoords(module, coords) {
-  const buffer = module._malloc(coords.length * 2 * 8)
-  const heap = new Float64Array(module.HEAPF64.buffer, buffer, coords.length * 2)
+  const flatSize = coords.length * 2
+  const offset = module._malloc(flatSize * Float64Array.BYTES_PER_ELEMENT)
+  const heapView = new Float64Array(module.HEAPF64.buffer, offset, flatSize)
   for (let i = 0; i < coords.length; i++) {
-      heap[2*i] = coords[i][0]
-      heap[2*i + 1] = coords[i][1]
+    heapView[2 * i] = coords[i][0]
+    heapView[2 * i + 1] = coords[i][1]
   }
-  return buffer
+  return offset
 }
 
 /**
  * Loads coordinates from the memory by the result pointer.
  * Frees the resultpointer and the result before returning
- * @param {*} module 
+ * @param {*} module
  * @param {*} result - pointer to Uint32 array of length 2. Stores the resultPointer and resultLength
  */
 export function loadResultAndFreeMemory(module, result) {
-  const [resultPointer, resultLength] = new Uint32Array(module.HEAPU32.buffer, result, 2)
-  const simplified = new Float64Array(module.HEAPF64.buffer, resultPointer, resultLength)
+  const [resultPointer, resultLength] = new Uint32Array(
+    module.HEAPU32.buffer,
+    result,
+    2
+  )
+  const simplified = new Float64Array(
+    module.HEAPF64.buffer,
+    resultPointer,
+    resultLength
+  )
   const coords = unflattenCoords(simplified)
   module._free(result)
   module._free(resultPointer)
@@ -37,12 +46,20 @@ export function loadResultAndFreeMemory(module, result) {
 /**
  * Loads coordinates from the memory by the result pointer without freeing memory.
  * For benchmarking purposes
- * @param {*} module 
+ * @param {*} module
  * @param {*} result - pointer to Uint32 array of length 2. Stores the resultPointer and resultLength
  */
 export function loadResult(module, result) {
-  const [resultPointer, resultLength] = new Uint32Array(module.HEAPU32.buffer, result, 2)
-  const simplified = new Float64Array(module.HEAPF64.buffer, resultPointer, resultLength)
+  const [resultPointer, resultLength] = new Uint32Array(
+    module.HEAPU32.buffer,
+    result,
+    2
+  )
+  const simplified = new Float64Array(
+    module.HEAPF64.buffer,
+    resultPointer,
+    resultLength
+  )
   return unflattenCoords(simplified)
 }
 
@@ -50,13 +67,13 @@ export function loadResult(module, result) {
  * Transforms a flat array to an array coordinate pairs
  * @param {Array} flattened - length must be even
  */
-export function unflattenCoords (flattened) {
+export function unflattenCoords(flattened) {
   const coords = []
   let x, y
   for (let i = 0; i < flattened.length; i += 2) {
-      x = flattened[i]
-      y = flattened[i + 1]
-      coords.push([x, y])
+    x = flattened[i]
+    y = flattened[i + 1]
+    coords.push([x, y])
   }
   return coords
 }