From d5b3ffb0dd6f12666b8ce234fedf6d01a425dec1 Mon Sep 17 00:00:00 2001
From: MarSeventh <1193267292@qq.com>
Date: Wed, 29 Jul 2026 21:07:54 +0800
Subject: [PATCH] fix: preserve GIF and SVG formats during transforms

---
 deploy/server/imageProcessor.js  | 14 ++++++++++++++
 functions/file/imageTransform.js |  6 ++----
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/deploy/server/imageProcessor.js b/deploy/server/imageProcessor.js
index ff78a77c..18f9ed81 100644
--- a/deploy/server/imageProcessor.js
+++ b/deploy/server/imageProcessor.js
@@ -20,6 +20,18 @@ sharp.concurrency(concurrency);
 export const dockerImageProcessor = {
     async transform(stream, options) {
         const input = await readStreamWithLimit(stream, MAX_INPUT_BYTES);
+
+        // SVG is inherently scalable. Keep the source document unchanged,
+        // matching Cloudflare Image Transformations behavior.
+        if (options.sourceType === 'image/svg+xml') {
+            return new Response(input, {
+                headers: {
+                    'Content-Type': options.sourceType,
+                    'Content-Length': input.byteLength.toString(),
+                },
+            });
+        }
+
         const animated = options.sourceType === 'image/gif' || options.sourceType === 'image/webp';
 
         let pipeline = sharp(input, {
@@ -62,6 +74,8 @@ function applyOutputFormat(pipeline, outputFormat) {
             return pipeline.webp();
         case 'image/avif':
             return pipeline.avif();
+        case 'image/gif':
+            return pipeline.gif();
         default:
             throw new Error(`Unsupported Docker image output format: ${outputFormat}`);
     }
diff --git a/functions/file/imageTransform.js b/functions/file/imageTransform.js
index 2ddb528c..91b42906 100644
--- a/functions/file/imageTransform.js
+++ b/functions/file/imageTransform.js
@@ -7,10 +7,8 @@ const OUTPUT_FORMATS = new Map([
     ['image/png', 'image/png'],
     ['image/webp', 'image/webp'],
     ['image/avif', 'image/avif'],
-    // Images binding does not encode GIF or SVG. WebP preserves GIF animation
-    // while PNG preserves SVG transparency.
-    ['image/gif', 'image/webp'],
-    ['image/svg+xml', 'image/png'],
+    ['image/gif', 'image/gif'],
+    ['image/svg+xml', 'image/svg+xml'],
 ]);
 
 export function parseImageTransform(url, accessConfig = {}) {