add cli flag --alpha-layer

now that we have long-opts, we don't have to worry about exhausting the
alphabet list for short-opts. so adding a cli flag to set/unset the
checker background makes sense.

ref: https://codeberg.org/nsxiv/nsxiv/issues/404

1 files changed, 5 insertions, 5 deletions

diff --git a/config.def.h b/config.def.h
index 198c696..a0935f6 100644
--- a/config.def.h
+++ b/config.def.h
@@ -45,11 +45,6 @@ static const double CONTRAST_MAX    = 4.0;
 /* command i_scroll pans image 1/PAN_FRACTION of screen width/height */
 static const int PAN_FRACTION = 5;
 
-/* if true, use a checkerboard background for alpha layer,
- * toggled with 'A' key binding
- */
-static const bool ALPHA_LAYER = false;
-
 /* percentage of memory to use for imlib2's cache size.
  *   3 means use 3% of total memory which is about 245MiB on 8GiB machine.
  *   0 or less means disable cache.
@@ -70,6 +65,11 @@ static const int CACHE_SIZE_FALLBACK = 32 * 1024 * 1024; /* fallback to 32MiB if
  */
 static const bool ANTI_ALIAS = true;
 
+/* if true, use a checkerboard background for alpha layer,
+ * toggled with 'A' key binding (overwritten via `--alpha-layer` option)
+ */
+static const bool ALPHA_LAYER = false;
+
 #endif
 #ifdef INCLUDE_THUMBS_CONFIG