Backport a patch to fix inverted colours

479.patch

@@ -0,0 +1,41 @@
+From 4f72099023bc5bb142a782a1924797729329cc9a Mon Sep 17 00:00:00 2001
+From: Robert Mader <robert.mader@posteo.de>
+Date: Wed, 6 Mar 2019 16:57:09 +0100
+Subject: [PATCH] Revert "cogl: Pick glReadPixels format by target, not source"
+
+This reverts commit 981b045459350d141fdfd16355cf2f4cd0aebc0f.
+
+Fixes https://gitlab.gnome.org/GNOME/mutter/issues/418
+---
+ cogl/cogl/driver/gl/cogl-framebuffer-gl.c | 6 +-----
+ 1 file changed, 1 insertion(+), 5 deletions(-)
+
+diff --git a/cogl/cogl/driver/gl/cogl-framebuffer-gl.c b/cogl/cogl/driver/gl/cogl-framebuffer-gl.c
+index c2bf92882..84c2f314a 100644
+--- a/cogl/cogl/driver/gl/cogl-framebuffer-gl.c
++++ b/cogl/cogl/driver/gl/cogl-framebuffer-gl.c
+@@ -4,7 +4,6 @@
+  * A Low Level GPU Graphics and Utilities API
+  *
+  * Copyright (C) 2007,2008,2009,2012 Intel Corporation.
+- * Copyright (C) 2018 DisplayLink (UK) Ltd.
+  *
+  * Permission is hereby granted, free of charge, to any person
+  * obtaining a copy of this software and associated documentation
+@@ -1274,12 +1273,9 @@ _cogl_framebuffer_gl_read_pixels_into_bitmap (CoglFramebuffer *framebuffer,
+   if (!cogl_is_offscreen (framebuffer))
+     y = framebuffer_height - y - height;
+ 
+-  /* Use target format ANY, because GL texture_swizzle extension cannot
+-   * ever apply for glReadPixels.
+-   */
+   required_format = ctx->driver_vtable->pixel_format_to_gl_with_target (ctx,
++                                                                        framebuffer->internal_format,
+                                                                         format,
+-                                                                        COGL_PIXEL_FORMAT_ANY,
+                                                                         &gl_intformat,
+                                                                         &gl_format,
+                                                                         &gl_type);
+-- 
+2.18.1
+