From 4db8f7e1a19f8d9484aa3eb253487bb7e52854bf Mon Sep 17 00:00:00 2001
From: maryla-uc <maryla@google.com>
Date: Fri, 20 Dec 2024 14:48:06 +0100
Subject: [PATCH] Fail early when trying to convert a jpeg+gainmap image
 without libxml2. (#2526)

---
 apps/avifgainmaputil/convert_command.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/apps/avifgainmaputil/convert_command.cc b/apps/avifgainmaputil/convert_command.cc
index 47f149c75b..b799eb5dfd 100644
--- a/apps/avifgainmaputil/convert_command.cc
+++ b/apps/avifgainmaputil/convert_command.cc
@@ -31,6 +31,12 @@ ConvertCommand::ConvertCommand()
 }
 
 avifResult ConvertCommand::Run() {
+#if !defined(AVIF_ENABLE_JPEG_GAIN_MAP_CONVERSION)
+  std::cout << "JPEG gainmap conversion unavailable because avifgainmaputil "
+               "was not built with libxml2.\n";
+  return AVIF_RESULT_NOT_IMPLEMENTED;
+#endif
+
   const avifPixelFormat pixel_format =
       static_cast<avifPixelFormat>(arg_image_read_.pixel_format.value());