fix bmp support

backend/src/managers/imagemanager/imageprocessor.service.ts

@@ -1,4 +1,5 @@
 import { Injectable } from '@nestjs/common';
+import * as bmp from '@vingle/bmp-js';
 import icoToPng from 'ico-to-png';
 import { AsyncFailable, Fail } from 'picsur-shared/dist/types';
 import sharp from 'sharp';
@@ -11,6 +12,11 @@ import {
 
 @Injectable()
 export class ImageProcessorService {
+  private readonly PngOptions = {
+    compressionLevel: 9,
+    effort: 10,
+  };
+
   constructor(private readonly userPref: UsrPreferenceService) {}
 
   public async process(
@@ -44,29 +50,18 @@ export class ImageProcessorService {
   ): AsyncFailable<Buffer> {
     let processedImage = image;
 
-    switch (mime.mime) {
-      case ImageMime.ICO:
-        processedImage = await icoToPng(processedImage, 512);
-        mime.mime = ImageMime.PNG;
-        break;
-
-      case ImageMime.BMP:
-      case ImageMime.TIFF:
-      case ImageMime.WEBP:
-      case ImageMime.PNG:
-      case ImageMime.JPEG:
-        processedImage = await sharp(processedImage)
-          .png({
-            compressionLevel: 9,
-            effort: 10,
-          })
-          .toBuffer();
-        mime.mime = ImageMime.PNG;
-        break;
-
-      default:
-        return Fail('Unsupported mime type');
+    if (mime.mime === ImageMime.ICO) {
+      processedImage = await icoToPng(processedImage, 512);
+    } else if (mime.mime === ImageMime.BMP) {
+      processedImage = await this.bmpSharp(processedImage)
+        .png(this.PngOptions)
+        .toBuffer();
+    } else {
+      processedImage = await sharp(processedImage)
+        .png(this.PngOptions)
+        .toBuffer();
     }
+    mime.mime = ImageMime.PNG;
 
     return processedImage;
   }
@@ -79,4 +74,15 @@ export class ImageProcessorService {
     // Apng and gif are stored as is for now
     return image;
   }
+
+  private bmpSharp(image: Buffer) {
+    const bitmap = bmp.decode(image, true);
+    return sharp(bitmap.data, {
+      raw: {
+        width: bitmap.width,
+        height: bitmap.height,
+        channels: 4,
+      },
+    });
+  }
 }