Addition of an "area of use" argument to proj_transform_crs_to_crs (#565)

In anticipation of a late-binding implementation of the proj_transform_crs_to_crs function
an area argument is added to the function prototype. The PJ_AREA struct is not in use yet,
but will be when the function is more tightly coupled to the EPSG database in the future.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/projects.h b/src/projects.h
index 2af382e5..cbb980ca 100644
--- a/src/projects.h
+++ b/src/projects.h
@@ -200,6 +200,12 @@ struct PJ_REGION_S {
     double ur_lat;
 };
 
+struct PJ_AREA {
+    int     id;         /* Area ID in the EPSG database */
+    LP      ll;         /* Lower left corner of bounding box */
+    LP      ur;         /* Upper right corner of bounding box */
+    char    descr[64];  /* text representation of area */
+};
 
 struct projCtx_t;
 typedef struct projCtx_t projCtx_t;