Add proj_degree_input() and proj_degree_output()

Equivalent to proj_angular_input() and proj_angular_output() but
checking for degree units instead. proj_create_crs_to_crs() rarely, if
ever, returns pipelines that has radians as input or output so using
proj_angular_*() is not a useful check for io units of pipelines.

These two new functions should make life a bit easier for users that
generally store there angular coordinates in radians.

Closes #2027

1 files changed, 3 insertions, 0 deletions

diff --git a/src/inv.cpp b/src/inv.cpp
index 17eb15b4..626c9ee5 100644
--- a/src/inv.cpp
+++ b/src/inv.cpp
@@ -54,6 +54,9 @@ static PJ_COORD inv_prepare (PJ *P, PJ_COORD coo) {
     case PJ_IO_UNITS_WHATEVER:
         return coo;
 
+    case PJ_IO_UNITS_DEGREES:
+        return coo;
+
     /* de-scale and de-offset */
     case PJ_IO_UNITS_CARTESIAN:
         coo.xyz.x *= P->to_meter;