libgimpcolor: add gimp_pixbuf_get_icc_profile()

which decodes and returns the pixbuf's base64-encoded "icc-profile"
property.

libgimpcolor/gimpcolor.def

@@ -59,6 +59,7 @@ EXPORTS
 	gimp_param_spec_rgb_has_alpha
 	gimp_pixbuf_create_buffer
 	gimp_pixbuf_get_format
+	gimp_pixbuf_get_icc_profile
 	gimp_rgb_add
 	gimp_rgb_clamp
 	gimp_rgb_composite

libgimpcolor/gimppixbuf.c

@@ -114,3 +114,40 @@ gimp_pixbuf_create_buffer (GdkPixbuf *pixbuf)
       return buffer;
     }
 }
+
+/**
+ * gimp_pixbuf_get_icc_profile:
+ * @pixbuf: a #GdkPixbuf
+ * @length: return location for the ICC profile's length
+ *
+ * Returns the ICC profile attached to the @pixbuf, or %NULL if there
+ * is none.
+ *
+ * Return value: The ICC profile data, or %NULL. The value should be freed
+ *               with g_free().
+ *
+ * Since: 2.10
+ **/
+guint8 *
+gimp_pixbuf_get_icc_profile (GdkPixbuf *pixbuf,
+                             gsize     *length)
+{
+  gchar *icc_base64 = NULL;
+
+  g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
+  g_return_val_if_fail (length != NULL, NULL);
+
+  g_object_get (pixbuf, "icc-profile", icc_base64, NULL);
+
+  if (icc_base64)
+    {
+      guint8 *icc_data;
+
+      icc_data = g_base64_decode (icc_base64, length);
+      g_free (icc_base64);
+
+      return icc_data;
+    }
+
+  return NULL;
+}

libgimpcolor/gimppixbuf.h

@@ -34,6 +34,9 @@ G_BEGIN_DECLS
 const Babl * gimp_pixbuf_get_format      (GdkPixbuf *pixbuf);
 GeglBuffer * gimp_pixbuf_create_buffer   (GdkPixbuf *pixbuf);
 
+guint8     * gimp_pixbuf_get_icc_profile (GdkPixbuf *pixbuf,
+                                          gsize     *length);
+
 
 G_END_DECLS