[gnome-color-manager] Fix gcm_utils_image_convert() to not crash for large images

[Richard Hughes <rhughes src gnome org>]

commit 2b609341144b86c2f786b60e996a742289d50f8c
Author: Richard Hughes <richard hughsie com>
Date:   Fri Apr 4 19:05:59 2014 +0200

    Fix gcm_utils_image_convert() to not crash for large images
    
    gdk_pixbuf_get_rowstride() returns the number of bytes, cd_transform_process()
    expects the number of pixels.

 src/gcm-utils.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/src/gcm-utils.c b/src/gcm-utils.c
index 72ab0b8..d2ce95b 100644
--- a/src/gcm-utils.c
+++ b/src/gcm-utils.c
@@ -380,6 +380,7 @@ gcm_utils_image_convert (GtkImage *image,
        GdkPixbuf *original_pixbuf;
        gboolean ret = TRUE;
        guchar *data;
+       guint bpp;
 
        /* get pixbuf */
        pixbuf = gtk_image_get_pixbuf (image);
@@ -422,12 +423,13 @@ gcm_utils_image_convert (GtkImage *image,
        cd_transform_set_rendering_intent (transform, CD_RENDERING_INTENT_PERCEPTUAL);
        cd_transform_set_input_pixel_format (transform, pixel_format);
        cd_transform_set_output_pixel_format (transform, pixel_format);
+       bpp = gdk_pixbuf_get_rowstride (pixbuf) / gdk_pixbuf_get_width (pixbuf);
        ret = cd_transform_process (transform,
                                    gdk_pixbuf_get_pixels (original_pixbuf),
                                    gdk_pixbuf_get_pixels (pixbuf),
                                    gdk_pixbuf_get_width (pixbuf),
                                    gdk_pixbuf_get_height (pixbuf),
-                                   gdk_pixbuf_get_rowstride (pixbuf),
+                                   gdk_pixbuf_get_rowstride (pixbuf) / bpp,
                                    NULL,
                                    error);
        if (!ret)