From 6d07193bdaa0f091fac01e0706cef802dc1afe56 Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Fri, 24 May 2024 10:10:56 +0200
Subject: [PATCH] render/color: add fallback stub when LCMS2 is disabled

It's cumbersome for compositors to guard every
wlr_color_transform_ref() or wlr_color_transform_unref() call
behind a #if WLR_HAS_COLOR_MANAGEMENT. Moreover, none of the LCMS2
types are used in our public API.

Instead, always install the color.h header, and add a stub for
wlr_color_transform_init_linear_to_icc().
---
 include/meson.build     | 3 ---
 render/color_fallback.c | 9 +++++++++
 render/meson.build      | 2 ++
 3 files changed, 11 insertions(+), 3 deletions(-)
 create mode 100644 render/color_fallback.c

diff --git a/include/meson.build b/include/meson.build
index 33d65ff2..165166c3 100644
--- a/include/meson.build
+++ b/include/meson.build
@@ -20,9 +20,6 @@ endif
 if not features.get('vulkan-renderer')
 	exclude_files += 'render/vulkan.h'
 endif
-if not features.get('color-management')
-	exclude_files += 'render/color.h'
-endif
 if not features.get('session')
 	exclude_files += 'backend/session.h'
 endif
diff --git a/render/color_fallback.c b/render/color_fallback.c
new file mode 100644
index 00000000..72741c33
--- /dev/null
+++ b/render/color_fallback.c
@@ -0,0 +1,9 @@
+#include <wlr/render/color.h>
+#include <wlr/util/log.h>
+
+struct wlr_color_transform *wlr_color_transform_init_linear_to_icc(
+		const void *data, size_t size) {
+	wlr_log(WLR_ERROR, "Cannot create color transform from ICC profile: "
+		"LCMS2 is compile-time disabled");
+	return NULL;
+}
diff --git a/render/meson.build b/render/meson.build
index e3c5f535..f3e497dd 100644
--- a/render/meson.build
+++ b/render/meson.build
@@ -46,4 +46,6 @@ if lcms2.found()
 	wlr_deps += lcms2
 	wlr_files += files('color_lcms2.c')
 	features += { 'color-management': true }
+else
+	wlr_files += files('color_fallback.c')
 endif