From 9d6eb3c2cfd9131b4291a9d153f7cc8d45d042a6 Mon Sep 17 00:00:00 2001
From: cha0s <git@cha0s.io>
Date: Wed, 28 Apr 2021 11:01:44 -0500
Subject: [PATCH] refactor: compression

---
 packages/topdown/src/resources/layer.js |  4 +--
 packages/topdown/src/resources/tiles.js | 43 ++++++++++++++++---------
 2 files changed, 29 insertions(+), 18 deletions(-)

diff --git a/packages/topdown/src/resources/layer.js b/packages/topdown/src/resources/layer.js
index dd4742b..8bd312e 100644
--- a/packages/topdown/src/resources/layer.js
+++ b/packages/topdown/src/resources/layer.js
@@ -59,8 +59,8 @@ export default (latus) => {
         tilesetUri,
         world,
       } = json;
-      const {EntityList, Tiles, Tileset} = latus.get('%resources');
-      this.setTiles(new Tiles(tiles));
+      const {EntityList, Tileset} = latus.get('%resources');
+      await this.tiles.load(tiles);
       this.tileset = tilesetUri
         ? await Tileset.load({extends: tilesetUri})
         : new Tileset();
diff --git a/packages/topdown/src/resources/tiles.js b/packages/topdown/src/resources/tiles.js
index 5872858..0e8b81b 100644
--- a/packages/topdown/src/resources/tiles.js
+++ b/packages/topdown/src/resources/tiles.js
@@ -4,7 +4,13 @@ import {
   Vector,
   Vertice,
 } from '@avocado/math';
-import {Class, compose, EventEmitter} from '@latus/core';
+import {
+  Class,
+  compose,
+  deflate,
+  EventEmitter,
+  inflate,
+} from '@latus/core';
 import {Synchronized} from '@avocado/s13n';
 
 // TODO: rows, with nulls
@@ -19,20 +25,14 @@ export default (latus) => {
   );
   return class Tiles extends decorate(Class) {
 
+    #data = [];
+
     #hasUpdates = false;
 
     #packets = [];
 
     #updates = [];
 
-    constructor({data, size} = {}) {
-      super();
-      if (size) {
-        super.size = size;
-      }
-      this.data = data && data.length > 0 ? data.concat() : Array(Vector.area(this.size)).fill(0);
-    }
-
     acceptPacket(packet) {
       if ('TilesUpdate' === packet.constructor.type) {
         const {position: [x, y], size: [w, h], tiles} = packet.data;
@@ -108,7 +108,18 @@ export default (latus) => {
     }
 
     indexHulls(indices) {
-      return this.constructor.indexHulls(indices, this.data, this.size);
+      return this.constructor.indexHulls(indices, this.#data, this.size);
+    }
+
+    async load(json) {
+      const {data, size} = json;
+      if (size) {
+        this.size = size;
+      }
+      if (data) {
+        const {buffer, byteOffset, length} = inflate(Buffer.from(data, 'base64'));
+        this.#data = new Uint16Array(buffer, byteOffset, length / 2);
+      }
     }
 
     packetsFor() {
@@ -139,10 +150,10 @@ export default (latus) => {
     setTileAt([x, y], tile) {
       const [w, h] = this.size;
       const index = y * w + x;
-      if (x < 0 || x >= w || y < 0 || y >= h || this.data[index] === tile) {
+      if (x < 0 || x >= w || y < 0 || y >= h || this.#data[index] === tile) {
         return;
       }
-      this.data[index] = tile;
+      this.#data[index] = tile;
       if ('client' !== process.env.SIDE) {
         this.#updates.push([[x, y], [1, 1], [tile]]);
         this.#hasUpdates = true;
@@ -161,7 +172,7 @@ export default (latus) => {
       let j = 0;
       for (let l = 0; l < h; ++l) {
         for (let k = 0; k < w; ++k) {
-          slice[j] = x < 0 || x >= fw || y < 0 || y >= fh ? 0 : this.data[i];
+          slice[j] = x < 0 || x >= fw || y < 0 || y >= fh ? 0 : this.#data[i];
           x += 1;
           i += 1;
           j += 1;
@@ -190,7 +201,7 @@ export default (latus) => {
       for (let yy = 0; yy < h; ++yy) {
         for (let xx = 0; xx < w; ++xx) {
           if (sx >= 0 && sx < fw && sy >= 0 && sy < fh) {
-            this.data[i] = tiles[j];
+            this.#data[i] = tiles[j];
             isDirty = true;
           }
           i += 1;
@@ -217,7 +228,7 @@ export default (latus) => {
 
     tileAt([x, y]) {
       const [w, h] = this.size;
-      return x < 0 || x >= w || y < 0 || y >= h ? undefined : this.data[y * w + x];
+      return x < 0 || x >= w || y < 0 || y >= h ? undefined : this.#data[y * w + x];
     }
 
     toNetwork() {
@@ -227,7 +238,7 @@ export default (latus) => {
     toJSON() {
       return {
         size: this.size,
-        data: this.data,
+        data: deflate(this.#data).toString('base64'),
       };
     }