Support checkered pigments in dimension.

1 files changed, 7 insertions, 1 deletions

diff --git a/libdimension/dimension/array.h b/libdimension/dimension/array.h
index b718021..fa48ac0 100644
--- a/libdimension/dimension/array.h
+++ b/libdimension/dimension/array.h
@@ -170,10 +170,16 @@ dmnsn_array_remove(dmnsn_array *array, size_t i)
   dmnsn_array_resize(array, size - 1);
 }
 
-/* Macro to shorten array iteration */
+/* Macros to shorten array iteration */
+
 #define DMNSN_ARRAY_FOREACH(type, i, array)                             \
   for (type i = dmnsn_array_first(array);                               \
        i - (type)dmnsn_array_first(array) < dmnsn_array_size(array);    \
        ++i)
 
+#define DMNSN_ARRAY_FOREACH_REVERSE(type, i, array)                     \
+  for (type i = dmnsn_array_last(array);                                \
+       (type)dmnsn_array_last(array) - i < dmnsn_array_size(array);     \
+       --i)
+
 #endif /* DIMENSION_ARRAY_H */