Merge RFC4 (#1865)

This commit is the result of the squashing of rfc4_dev branch in a single
commit. It implements mostly RFC 4 related work.

* Grid handling:
  - remove obsolete and presumably unfinished implementation of grid catalog functionality
  - all grid functionality is in grids.cpp/.hpp
  - vertical and horizontal grid shift: rework to no longer load whole grid into memory
  - remove hgrids and vgrids member from PJ structure, and store them in hgridshift/vgridshift/deformation structures
  - build systems: add optional libtiff dependency. Must be explicitly disabled if not desired
  - add support for horizontal and vertical grids in GeoTIFF, if libtiff is available
  - add GenericShiftGridSet and GenericShiftGrid classes, relying on TIFF grids, that can be used for generic purpose grid-based adjustment
  - add a +proj=xyzgridshift method to perform geocentric translation by grid. Used for French NTF to RGF93 transformation using gr3df97a.tif grid
  - deformation: add support for +grids= for GeoTIFF grids
  - horizontal grid shift: fix failures on points slightly outside a subgrid (fixes #209)

* File management:
  - add a filemanager.cpp/.hpp to deal with file related work
  - test for legacy proj_api.h fileapi
  - proj.h: add proj_context_set_fileapi() and proj_context_set_sqlite3_vfs_name() (fixes #866)
  - add capability to read resource files from the user writable directory

* Network access:
  - build systems: add optional curl dependency
  - add a curl-based default implementation for network related functionality
  - proj.h: add C API to control network functionality, and optionaly provide network callbacks
  - add data/proj.ini with default settings
  - add a SQLite3 local cache of downloaded chunks
  - add proj_is_download_needed() and proj_download_file()

* Use Win32 Unicode APIs and expect all strings to be UTF-8 (fixes #1765)
  For backward compatibility, if PROJ_LIB content is found to be not UTF-8 or
  pointing to a non existing directory, then an attempt at interpretating it
  in the ANSI page encoding is done.
  proj_context_set_search_paths() now assumes strings to be in UTF-8, and
  functions returning paths will also return values in UTF-8.

1 files changed, 20 insertions, 2 deletions

diff --git a/src/pipeline.cpp b/src/pipeline.cpp
index 96767143..511a69fe 100644
--- a/src/pipeline.cpp
+++ b/src/pipeline.cpp
@@ -155,7 +155,7 @@ static PJ_LPZ    pipeline_reverse_3d (PJ_XYZ xyz, PJ *P);
 static PJ_XY     pipeline_forward (PJ_LP lp, PJ *P);
 static PJ_LP     pipeline_reverse (PJ_XY xy, PJ *P);
 
-void pj_pipeline_assign_context_to_steps( PJ* P, PJ_CONTEXT* ctx )
+static void pipeline_reassign_context( PJ* P, PJ_CONTEXT* ctx )
 {
     auto pipeline = static_cast<struct Pipeline*>(P->opaque);
     for( auto& step: pipeline->steps )
@@ -170,6 +170,9 @@ static PJ_COORD pipeline_forward_4d (PJ_COORD point, PJ *P) {
         if( !step.omit_fwd )
         {
             point = proj_trans (step.pj, PJ_FWD, point);
+            if( point.xyzt.x == HUGE_VAL ) {
+                break;
+            }
         }
     }
 
@@ -186,6 +189,9 @@ static PJ_COORD pipeline_reverse_4d (PJ_COORD point, PJ *P) {
         if( !step.omit_inv )
         {
             point = proj_trans (step.pj, PJ_INV, point);
+            if( point.xyzt.x == HUGE_VAL ) {
+                break;
+            }
         }
     }
 
@@ -204,6 +210,9 @@ static PJ_XYZ pipeline_forward_3d (PJ_LPZ lpz, PJ *P) {
         if( !step.omit_fwd )
         {
             point = pj_approx_3D_trans (step.pj, PJ_FWD, point);
+            if( point.xyzt.x == HUGE_VAL ) {
+                break;
+            }
         }
     }
 
@@ -222,6 +231,9 @@ static PJ_LPZ pipeline_reverse_3d (PJ_XYZ xyz, PJ *P) {
         if( !step.omit_inv )
         {
             point = proj_trans (step.pj, PJ_INV, point);
+            if( point.xyzt.x == HUGE_VAL ) {
+                break;
+            }
         }
     }
 
@@ -240,6 +252,9 @@ static PJ_XY pipeline_forward (PJ_LP lp, PJ *P) {
         if( !step.omit_fwd )
         {
             point = pj_approx_2D_trans (step.pj, PJ_FWD, point);
+            if( point.xyzt.x == HUGE_VAL ) {
+                break;
+            }
         }
     }
 
@@ -258,6 +273,9 @@ static PJ_LP pipeline_reverse (PJ_XY xy, PJ *P) {
         if( !step.omit_inv )
         {
             point = pj_approx_2D_trans (step.pj, PJ_INV, point);
+            if( point.xyzt.x == HUGE_VAL ) {
+                break;
+            }
         }
     }
 
@@ -413,7 +431,7 @@ PJ *OPERATION(pipeline,0) {
     P->fwd    =  pipeline_forward;
     P->inv    =  pipeline_reverse;
     P->destructor  =  destructor;
-    P->is_pipeline =  1;
+    P->reassign_context = pipeline_reassign_context;
 
     /* Currently, the pipeline driver is a raw bit mover, enabling other operations */
     /* to collaborate efficiently. All prep/fin stuff is done at the step levels. */