Introduce compatibility for cs2cs-style proj-strings into the 4D API.

Parameters such as towgs84, nadgrids and geoidgrids was previously only
handled by pj_transform(). This commit add a compatibility layer in
proj_create() by calling the pj_cs2cs_emulation_setup() function. This
function sets up a handful of predefined transformation objects on the
PJ object that is being created. Each of these transformation objects
are related to the cs2cs-style parameters we are trying to emulate in
the 4D API. That is, if the +towgs84 parameters is used we create
P->helmert with the parameters specified in +towgs84. Similarly for
+axis, +nadgrids and +geoidgrids. When these transformation objects
exists we use them in the prepare and finalize functions in pj_fwd/
pj_inv. If no cs2cs-style parametes are specified we skip those
parts of the prepare and finalizing steps.

Co-authored-by:Thomas Knudsen <thokn@sdfe.dk>
Co-authored-by:Kristian Evers <kristianevers@gmail.com>

1 files changed, 0 insertions, 4 deletions

diff --git a/src/proj_internal.h b/src/proj_internal.h
index 41f95c07..2c6cbee2 100644
--- a/src/proj_internal.h
+++ b/src/proj_internal.h
@@ -84,10 +84,6 @@ void proj_context_inherit (PJ *parent, PJ *child);
 PJ_COORD pj_fwd4d (PJ_COORD coo, PJ *P);
 PJ_COORD pj_inv4d (PJ_COORD coo, PJ *P);
 
-PJ_COORD pj_fwd_prepare  (PJ *P, PJ_COORD coo);
-PJ_COORD pj_fwd_finalize (PJ *P, PJ_COORD coo);
-PJ_COORD pj_inv_prepare  (PJ *P, PJ_COORD coo);
-PJ_COORD pj_inv_finalize (PJ *P, PJ_COORD coo);
 PJ_COORD pj_approx_2D_trans (PJ *P, PJ_DIRECTION direction, PJ_COORD coo);
 PJ_COORD pj_approx_3D_trans (PJ *P, PJ_DIRECTION direction, PJ_COORD coo);