fix is_equal_to_sixteen in PNG I/O extension

While is_equal_to_sixteen should (as the name suggests) check for equality to 16, it actually checked whether the bit depth was less than 16.
boostorg · Apr 25, 2022 · 6a77ba5 · 6a77ba5
1 parent caf92fa
commit 6a77ba5
Showing 1 changed file with 17 additions and 3 deletions.
diff --git a/include/boost/gil/extension/io/png/detail/write.hpp b/include/boost/gil/extension/io/png/detail/write.hpp
@@ -171,10 +171,24 @@ class writer< Device
     {};
 
     template<typename Info>
-    struct is_equal_to_sixteen : mp11::mp_less
+    struct is_equal_to_sixteen : mp11::mp_and
         <
-            std::integral_constant<int, Info::_bit_depth>,
-            std::integral_constant<int, 16>
+            mp11::mp_not
+            <
+                mp11::mp_less
+                <
+                    std::integral_constant<int, Info::_bit_depth>,
+                    std::integral_constant<int, 16>
+                >
+            >,
+            mp11::mp_not
+            <
+                mp11::mp_less
+                <
+                    std::integral_constant<int, 16>,
+                    std::integral_constant<int, Info::_bit_depth>
+                >
+            >
         >
     {};