[eog] Allow color correcting images with alpha channel

[Felix Riemann <friemann src gnome org>]

commit 80b536bcd2f08f314e10f47d3689283c7ae577a6
Author: pdknsk <pdknsk gmail com>
Date:   Mon Mar 3 22:58:16 2014 +0100

    Allow color correcting images with alpha channel
    
    This is mostly useful for PNG images for now but could also help
    with TIFF files in the future. LittleCMS will still ignore the
    alpha channel, so this should be harmless.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=725357

 src/eog-image.c |   19 +++++++++----------
 1 files changed, 9 insertions(+), 10 deletions(-)
---
diff --git a/src/eog-image.c b/src/eog-image.c
index d94604a..1b7ef7e 100644
--- a/src/eog-image.c
+++ b/src/eog-image.c
@@ -709,18 +709,17 @@ eog_image_apply_display_profile (EogImage *img, cmsHPROFILE screen)
                return;
        }
 
-       /* TODO: find the right way to colorcorrect RGBA images */
-       if (gdk_pixbuf_get_has_alpha (priv->image)) {
-               eog_debug_message (DEBUG_LCMS, "Colorcorrecting RGBA images is unsupported.");
-               return;
-       }
+       cmsUInt32Number color_type = TYPE_RGB_8;
+
+       if (gdk_pixbuf_get_has_alpha (priv->image))
+               color_type = TYPE_RGBA_8;
 
        transform = cmsCreateTransform (priv->profile,
-                                       TYPE_RGB_8,
-                                       screen,
-                                       TYPE_RGB_8,
-                                       INTENT_PERCEPTUAL,
-                                       0);
+                                       color_type,
+                                       screen,
+                                       color_type,
+                                       INTENT_PERCEPTUAL,
+                                       0);
 
        if (G_LIKELY (transform != NULL)) {
                rows = gdk_pixbuf_get_height (priv->image);