Description improvement and some behavior change for sdr-adjust-gamma

DOCS/man/options.rst

@@ -7377,10 +7377,13 @@ them.
     ``yes``, it will be converted based on the available metadata.
 
     ``auto`` (default) behaves like ``no``, except when ``--target-trc`` is
-    explicitly set, in which case it behaves like ``yes``.
+    explicitly set, in which case it behaves like ``yes``. Besides, on macOS it
+    should always behaves like ``yes``.
 
     Generally it's recommended to enable this option, if you can ensure that
-    both source and target metadata is correct.
+    both source and target metadata is correct. On color-managed platforms, the
+    target metadata is likely to be accurate. However, the accuracy of the
+    source metadata might not be guaranteed.
 
     (Only for ``--vo=gpu-next``)
 

video/out/vo_gpu_next.c

@@ -1272,6 +1272,10 @@ static bool draw_frame(struct vo *vo, struct vo_frame *frame)
         case PL_COLOR_TRC_BT_1886:
         case PL_COLOR_TRC_GAMMA22:
         case PL_COLOR_TRC_SRGB:
+#ifdef __APPLE__
+            if (opts->sdr_adjust_gamma == 0)
+                break;
+#endif
             target.color.transfer = frame->current->params.color.transfer;
         }
     }