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

upstream commit:
https://gitlab.gnome.org/GNOME/eog/commit/80b536bc

1 files changed, 9 insertions, 10 deletions

diff --git a/src/eom-image.c b/src/eom-image.c
index f173a2f..f8add9d 100644
--- a/src/eom-image.c
+++ b/src/eom-image.c
@@ -667,18 +667,17 @@ eom_image_apply_display_profile (EomImage *img, cmsHPROFILE screen)
 		return;
 	}
 
-	/* TODO: find the right way to colorcorrect RGBA images */
-	if (gdk_pixbuf_get_has_alpha (priv->image)) {
-		eom_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);