From 7aa340232e58ef6db104f6e70f63e1eea60c658e Mon Sep 17 00:00:00 2001
From: Kleis Auke Wolthuizen <github@kleisauke.nl>
Date: Fri, 28 Jan 2022 12:50:31 +0100
Subject: [PATCH] Ensure delays of the origin image is preserved (#3062)

By not initializing the delay vector, since we assume it's empty by default.

See: #3061.
---
 src/pipeline.h    | 1 -
 test/unit/webp.js | 9 +++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/pipeline.h b/src/pipeline.h
index b0cca2b16..f9d95b18f 100644
--- a/src/pipeline.h
+++ b/src/pipeline.h
@@ -327,7 +327,6 @@ struct PipelineBaton {
     ensureAlpha(-1.0),
     colourspaceInput(VIPS_INTERPRETATION_LAST),
     colourspace(VIPS_INTERPRETATION_LAST),
-    delay{-1},
     loop(-1),
     tileSize(256),
     tileOverlap(0),
diff --git a/test/unit/webp.js b/test/unit/webp.js
index f87f3caf0..a9b818f85 100644
--- a/test/unit/webp.js
+++ b/test/unit/webp.js
@@ -183,6 +183,15 @@ describe('WebP', function () {
     assert.deepStrictEqual(updated.delay, expectedDelay);
   });
 
+  it('should preserve delay between frames', async () => {
+    const updated = await sharp(fixtures.inputWebPAnimated, { pages: -1 })
+      .webp()
+      .toBuffer()
+      .then(data => sharp(data, { pages: -1 }).metadata());
+
+    assert.deepStrictEqual(updated.delay, [120, 120, 90, 120, 120, 90, 120, 90, 30]);
+  });
+
   it('should work with streams when only animated is set', function (done) {
     fs.createReadStream(fixtures.inputWebPAnimated)
       .pipe(sharp({ animated: true }))