[mutter] background: Fix gradient color rendering

[Ray Strode <halfline src gnome org>]

commit e623406c994e5ed9a55de525fedcde0c23f5f197
Author: Ray Strode <rstrode redhat com>
Date:   Thu Feb 21 22:07:43 2013 -0500

    background: Fix gradient color rendering
    
    There is currently code to try to fill gradients in a
    hardware native format, using #ifdefs. That optimization is
    unimportant since gradients only use 2 byte buffers. It's
    also incorrect because it's getting the channel order wrong
    at buffer initialization time.
    
    This commit drops the ifdefs for clarity and fixes the
    channel order.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=694641

 src/compositor/meta-background.c |    9 ++-------
 1 files changed, 2 insertions(+), 7 deletions(-)
---
diff --git a/src/compositor/meta-background.c b/src/compositor/meta-background.c
index b24a8be..82164d6 100644
--- a/src/compositor/meta-background.c
+++ b/src/compositor/meta-background.c
@@ -33,12 +33,6 @@
 #include <meta/meta-background.h>
 #include "meta-background-actor-private.h"
 
-#if G_BYTE_ORDER == G_LITTLE_ENDIAN
-#define TEXTURE_FORMAT COGL_PIXEL_FORMAT_BGRA_8888_PRE
-#else
-#define TEXTURE_FORMAT COGL_PIXEL_FORMAT_ARGB_8888_PRE
-#endif
-
 #define TEXTURE_LOOKUP_SHADER_DECLARATIONS                                     \
 "uniform vec2 pixel_step;\n"                                                   \
 "vec4 apply_blur(in sampler2D texture, in vec2 coordinates) {\n"               \
@@ -932,9 +926,10 @@ meta_background_load_gradient (MetaBackground             *self,
   pixels[5] = second_color->green;
   pixels[6] = second_color->blue;
   pixels[7] = second_color->alpha;
+
   texture = cogl_texture_new_from_data (width, height,
                                         COGL_TEXTURE_NO_SLICING,
-                                        TEXTURE_FORMAT,
+                                        COGL_PIXEL_FORMAT_RGBA_8888,
                                         COGL_PIXEL_FORMAT_ANY,
                                         4,
                                         pixels);