fix daily backup

src/core/Palette.js

@@ -123,17 +123,23 @@ class Palette {
   /*
    * Take a buffer of indexed pixels and output it as RGB Array
    * @param chunkBuffer Buffer of indexed pixels
+   * @param targetLength Optional integer of length of chunk
+   *   (will be padded or cut to its size)
    * @return RGB Buffer
    */
-  buffer2RGB(chunkBuffer) {
-    const { length } = chunkBuffer;
+  buffer2RGB(chunkBuffer, targetLength = null) {
+    let minLength = chunkBuffer.length;
+    let length = minLength;
+    if (targetLength) {
+      minLength = Math.min(targetLength, minLength);
+      length = targetLength;
+    }
     const colors = new Uint8Array(length * 3);
     let color;
     let value;
     const { rgb } = this;
-
     let c = 0;
-    for (let i = 0; i < length; i++) {
+    for (let i = 0; i < minLength; i++) {
       value = chunkBuffer[i];
 
       color = (value & 0x3F) * 3;
@@ -141,6 +147,17 @@ class Palette {
       colors[c++] = rgb[color++];
       colors[c++] = rgb[color];
     }
+
+    if (minLength < length) {
+      const blankR = rgb[0];
+      const blankG = rgb[1];
+      const blankB = rgb[2];
+      for (let i = minLength; i < length; i += 1) {
+        colors[c++] = blankR;
+        colors[c++] = blankG;
+        colors[c++] = blankB;
+      }
+    }
     return colors;
   }
 

src/core/tilesBackup.js

@@ -279,13 +279,7 @@ export async function createPngBackup(
         }
         if (chunk && chunk.length) {
           try {
-            const tileBuffer = new Uint32Array(TILE_SIZE ** 2);
-            const chunkLength = chunk.length;
-            const { abgr } = palette;
-            for (let i = 0; i < chunkLength; i += 1) {
-              tileBuffer[i] = abgr[chunk[i] & 0x3F];
-            }
-
+            const tileBuffer = palette.buffer2RGB(chunk, TILE_SIZE ** 2);
             const filename = `${xBackupDir}/${y}.png`;
 
             // eslint-disable-next-line no-await-in-loop