From 0a1d82de2ac7d0fc03330f8510a81363fcde3e01 Mon Sep 17 00:00:00 2001
From: zanhecht <797985+zanhecht@users.noreply.github.com>
Date: Tue, 9 Jan 2024 19:27:45 -0500
Subject: [PATCH] Remove legacy CSS gradient code from liveview.htm

Reduce file size by removing legacy CSS gradient code and moving drawing operations to a separate function
---
 wled00/data/liveview.htm | 89 +++++++++++++---------------------------
 1 file changed, 29 insertions(+), 60 deletions(-)

diff --git a/wled00/data/liveview.htm b/wled00/data/liveview.htm
index 2e526bf7f..a41ce2e31 100644
--- a/wled00/data/liveview.htm
+++ b/wled00/data/liveview.htm
@@ -6,28 +6,32 @@
   <meta name="theme-color" content="#222222">
   <title>WLED Live Preview</title>
   <style>
-  body {
-    margin: 0;
-  }
-  #canv {
-    background: black;
-    filter: brightness(175%);
-    width: 100%;
-    height: 100%;
-    position: absolute;
-  }
-  #canvas {
-    width: 100%;
-    height: 100%;
-    position: absolute;
-  }
+    body {
+      margin: 0;
+    }
+    #canv {
+      background: black;
+      filter: brightness(175%);
+      width: 100%;
+      height: 100%;
+      position: absolute;
+    }
   </style>
   <script>
     var d = document;
     var ws;
     var tmout = null;
-    function update() // via HTTP (/json/live)
-    {
+    var c;
+    var ctx;
+    function draw(start, skip, leds, fill) {
+      c.width = d.documentElement.clientWidth;
+      w = c.width / (leds.length - start);
+      for (i = start; i < leds.length; i += skip) {
+        ctx.fillStyle = fill(leds,i);
+        ctx.fillRect((i - start) * w, 0, 4 * w, c.height);
+      }
+    }
+    function update() { // via HTTP (/json/live)
       if (d.hidden) {
         clearTimeout(tmout);
         tmout = setTimeout(update, 250);
@@ -42,25 +46,7 @@
         return res.json();
       })
       .then(json => {
-        var leddata = (data) => "#" + ((data.length > 6) ? data.substring(2) : data);
-        var len = json.leds.length;
-        try { //canvas support
-          var c = d.getElementById('canvas');
-          var ctx = c.getContext('2d');
-          c.width = d.documentElement.clientWidth;
-          ctx.clearRect(0, 0, c.width, c.height);
-          for (i = 0; i < len; i++) {
-            ctx.fillStyle = leddata(json.leds[i]);
-            ctx.fillRect(i * c.width / len, 0, c.width, c.height);
-          }
-        } catch (e) { //fallback to gradient method
-          var str = "linear-gradient(90deg,";
-          for (i = 0; i < len; i++) {
-            str += leddata(json.leds[i]) + ((i < len -1) ? "," : "");
-          }
-          str += ")";
-          d.getElementById("canv").style.background = str;
-        }
+        draw(0, 1, json.leds, (a,i) => "#" + ((a[i].length > 6) ? a[i].substring(2) : a[i]));
         clearTimeout(tmout);
         tmout = setTimeout(update, 40);
       })
@@ -71,8 +57,9 @@
       })
     }
     function S() { // Startup function (onload)
-      let wsOn = (window.location.href.indexOf("?ws") > 0);
-      if (!wsOn) {update(); return;}
+      c = d.getElementById('canv');
+      ctx = c.getContext('2d');
+      if (window.location.href.indexOf("?ws") == -1) {update(); return;}
 
       // Initialize WebSocket connection
       try {
@@ -102,26 +89,8 @@
           if (toString.call(e.data) === '[object ArrayBuffer]') {
             let leds = new Uint8Array(event.data);
             if (leds[0] != 76) return; //'L'
-            let len = leds.length;
-            let start = leds[1]==2 ? 4 : 2; // 1 = 1D, 2 = 1D/2D (leds[2]=w, leds[3]=h)
-            let rgb = (i) => `rgb(${leds[i]},${leds[i+1]},${leds[i+2]})`;
-            try { //canvas support
-              var c = d.getElementById('canvas');
-              var ctx = c.getContext('2d');
-              c.width = d.documentElement.clientWidth;
-              ctx.clearRect(0, 0, c.width, c.height);
-              for (i = start; i < len; i+=3) {
-                ctx.fillStyle = rgb(i);
-                ctx.fillRect((i - start) * c.width / (len - start), 0, c.width, c.height);
-              }
-            } catch (e) { //fallback to gradient method
-              let str = "linear-gradient(90deg,";
-              for (i = start; i < len; i+=3) {
-                str += rgb(i) + ((i < len -3) ? "," : "");
-              }
-              str += ")";
-              d.getElementById("canv").style.background = str;
-            }
+            // leds[1] = 1: 1D; leds[1] = 2: 1D/2D (leds[2]=w, leds[3]=h)
+            draw(leds[1]==2 ? 4 : 2, 3, leds, (a,i) => `rgb(${a[i]},${a[i+1]},${a[i+2]})`);
           }
         } catch (err) {
           console.error("Peek WS error:",err);
@@ -131,6 +100,6 @@
   </script>
 </head>
 <body onload="S()">
-  <div id="canv"><canvas id="canvas"></canvas></div>
+  <canvas id="canv"></canvas>
 </body>
-</html>
\ No newline at end of file
+</html>