From 655da113c843769f4ceb481c5612b1a504c8f76d Mon Sep 17 00:00:00 2001
From: Lovell Fuller <github@lovell.info>
Date: Wed, 1 Nov 2023 13:54:33 +0000
Subject: [PATCH] Ensure multi-page extract remains sequential #3837

---
 docs/changelog.md | 3 +++
 src/operations.cc | 1 +
 2 files changed, 4 insertions(+)

diff --git a/docs/changelog.md b/docs/changelog.md
index 6d858ee8..87c92a9c 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -27,6 +27,9 @@ Requires libvips v8.14.5
   [#3823](https://github.com/lovell/sharp/pull/3823)
   [@uhthomas](https://github.com/uhthomas)
 
+* Ensure multi-page extract remains sequential.
+  [#3837](https://github.com/lovell/sharp/issues/3837)
+
 ## v0.32 - *flow*
 
 Requires libvips v8.14.5
diff --git a/src/operations.cc b/src/operations.cc
index e59157ff..6fbe9906 100644
--- a/src/operations.cc
+++ b/src/operations.cc
@@ -370,6 +370,7 @@ namespace sharp {
       pages.reserve(nPages);
 
       // Split the image into cropped frames
+      image = StaySequential(image, VIPS_ACCESS_SEQUENTIAL);
       for (int i = 0; i < nPages; i++) {
         pages.push_back(
           image.extract_area(left, *pageHeight * i + top, width, height));