From 7bcf0bb93f93abaf4793aa2777d1396165a3a188 Mon Sep 17 00:00:00 2001
From: John Cupitt <jcupitt@gmail.com>
Date: Mon, 29 May 2017 10:19:21 +0100
Subject: [PATCH] don't cache thumbnail

thanks tomasc! see

jcupitt/ruby-vips#109
---
 ChangeLog                    | 1 +
 libvips/resample/thumbnail.c | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 912c9dba..289e9cd0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,7 @@
 - raise b64 limit to allow for huge profiles (thanks jaume)
 - fix error return in blob save (thanks jaume)
 - tag vipsprofile as py2 (thanks ioquatix)
+- don't cache thumbnail (thanks tomasc)
 
 23/4/17 started 8.5.5
 - doc polishing
diff --git a/libvips/resample/thumbnail.c b/libvips/resample/thumbnail.c
index a81bb99d..6211aed9 100644
--- a/libvips/resample/thumbnail.c
+++ b/libvips/resample/thumbnail.c
@@ -5,6 +5,8 @@
  * 	- from vipsthumbnail.c
  * 6/1/17
  * 	- add @size parameter
+ * 29/5/17
+ * 	- don't cache (thanks tomasc)
  */
 
 /*
@@ -514,6 +516,7 @@ vips_thumbnail_class_init( VipsThumbnailClass *class )
 {
 	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
 	VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
+	VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
 
 	gobject_class->dispose = vips_thumbnail_dispose;
 	gobject_class->finalize = vips_thumbnail_finalize;
@@ -524,6 +527,11 @@ vips_thumbnail_class_init( VipsThumbnailClass *class )
 	vobject_class->description = _( "thumbnail generation" );
 	vobject_class->build = vips_thumbnail_build;
 
+	/* We mustn't cache these calls, since we open the file or buffer in 
+	 * sequential mode.
+	 */
+	operation_class->flags = VIPS_OPERATION_NOCACHE;
+
 	VIPS_ARG_IMAGE( class, "out", 2, 
 		_( "Output" ), 
 		_( "Output image" ),