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#define PJ_LIB__
#include <errno.h>
#include <stddef.h>
#include <string.h>
#include <time.h>
#include "proj_internal.h"
#include "proj/internal/mutex.hpp"
#include "grids.hpp"
PROJ_HEAD(vgridshift, "Vertical grid shift");
static NS_PROJ::mutex gMutex{};
static std::set<std::string> gKnownGrids{};
using namespace NS_PROJ;
namespace { // anonymous namespace
struct vgridshiftData {
double t_final = 0;
double t_epoch = 0;
double forward_multiplier = 0;
ListOfVGrids grids{};
bool defer_grid_opening = false;
};
} // anonymous namespace
static void deal_with_vertcon_gtx_hack(PJ *P)
{
struct vgridshiftData *Q = (struct vgridshiftData *) P->opaque;
// The .gtx VERTCON files stored millimeters, but the .tif files
// are in metres.
if( Q->forward_multiplier != 0.001 ) {
return;
}
const char* gridname = pj_param(P->ctx, P->params, "sgrids").s;
if( !gridname ) {
return;
}
if( strcmp(gridname, "vertconw.gtx") != 0 &&
strcmp(gridname, "vertconc.gtx") != 0 &&
strcmp(gridname, "vertcone.gtx") != 0 ) {
return;
}
if( Q->grids.empty() ) {
return;
}
const auto& grids = Q->grids[0]->grids();
if( !grids.empty() &&
grids[0]->name().find(".tif") != std::string::npos ) {
Q->forward_multiplier = 1.0;
}
}
static PJ_XYZ forward_3d(PJ_LPZ lpz, PJ *P) {
struct vgridshiftData *Q = (struct vgridshiftData *) P->opaque;
PJ_COORD point = {{0,0,0,0}};
point.lpz = lpz;
if ( Q->defer_grid_opening ) {
Q->defer_grid_opening = false;
Q->grids = pj_vgrid_init(P, "grids");
deal_with_vertcon_gtx_hack(P);
if ( proj_errno(P) ) {
return proj_coord_error().xyz;
}
}
if (!Q->grids.empty()) {
/* Only try the gridshift if at least one grid is loaded,
* otherwise just pass the coordinate through unchanged. */
point.xyz.z += pj_vgrid_value(P, Q->grids, point.lp, Q->forward_multiplier);
}
return point.xyz;
}
static PJ_LPZ reverse_3d(PJ_XYZ xyz, PJ *P) {
struct vgridshiftData *Q = (struct vgridshiftData *) P->opaque;
PJ_COORD point = {{0,0,0,0}};
point.xyz = xyz;
if ( Q->defer_grid_opening ) {
Q->defer_grid_opening = false;
Q->grids = pj_vgrid_init(P, "grids");
deal_with_vertcon_gtx_hack(P);
if ( proj_errno(P) ) {
return proj_coord_error().lpz;
}
}
if (!Q->grids.empty()) {
/* Only try the gridshift if at least one grid is loaded,
* otherwise just pass the coordinate through unchanged. */
point.xyz.z -= pj_vgrid_value(P, Q->grids, point.lp, Q->forward_multiplier);
}
return point.lpz;
}
static PJ_COORD forward_4d(PJ_COORD obs, PJ *P) {
struct vgridshiftData *Q = (struct vgridshiftData *) P->opaque;
PJ_COORD point = obs;
/* If transformation is not time restricted, we always call it */
if (Q->t_final==0 || Q->t_epoch==0) {
point.xyz = forward_3d (obs.lpz, P);
return point;
}
/* Time restricted - only apply transform if within time bracket */
if (obs.lpzt.t < Q->t_epoch && Q->t_final > Q->t_epoch)
point.xyz = forward_3d (obs.lpz, P);
return point;
}
static PJ_COORD reverse_4d(PJ_COORD obs, PJ *P) {
struct vgridshiftData *Q = (struct vgridshiftData *) P->opaque;
PJ_COORD point = obs;
/* If transformation is not time restricted, we always call it */
if (Q->t_final==0 || Q->t_epoch==0) {
point.lpz = reverse_3d (obs.xyz, P);
return point;
}
/* Time restricted - only apply transform if within time bracket */
if (obs.lpzt.t < Q->t_epoch && Q->t_final > Q->t_epoch)
point.lpz = reverse_3d (obs.xyz, P);
return point;
}
static PJ *destructor (PJ *P, int errlev) {
if (nullptr==P)
return nullptr;
delete static_cast<struct vgridshiftData*>(P->opaque);
P->opaque = nullptr;
return pj_default_destructor(P, errlev);
}
static void reassign_context( PJ* P, PJ_CONTEXT* ctx )
{
auto Q = (struct vgridshiftData *) P->opaque;
for( auto& grid: Q->grids ) {
grid->reassign_context(ctx);
}
}
PJ *TRANSFORMATION(vgridshift,0) {
auto Q = new vgridshiftData;
P->opaque = (void *) Q;
P->destructor = destructor;
P->reassign_context = reassign_context;
if (!pj_param(P->ctx, P->params, "tgrids").i) {
proj_log_error(P, _("+grids parameter missing."));
return destructor (P, PROJ_ERR_INVALID_OP_MISSING_ARG);
}
/* TODO: Refactor into shared function that can be used */
/* by both vgridshift and hgridshift */
if (pj_param(P->ctx, P->params, "tt_final").i) {
Q->t_final = pj_param (P->ctx, P->params, "dt_final").f;
if (Q->t_final == 0) {
/* a number wasn't passed to +t_final, let's see if it was "now" */
/* and set the time accordingly. */
if (!strcmp("now", pj_param(P->ctx, P->params, "st_final").s)) {
time_t now;
struct tm *date;
time(&now);
date = localtime(&now);
Q->t_final = 1900.0 + date->tm_year + date->tm_yday/365.0;
}
}
}
if (pj_param(P->ctx, P->params, "tt_epoch").i)
Q->t_epoch = pj_param (P->ctx, P->params, "dt_epoch").f;
/* historical: the forward direction subtracts the grid offset. */
Q->forward_multiplier = -1.0;
if (pj_param(P->ctx, P->params, "tmultiplier").i) {
Q->forward_multiplier = pj_param(P->ctx, P->params, "dmultiplier").f;
}
if( P->ctx->defer_grid_opening ) {
Q->defer_grid_opening = true;
}
else {
const char *gridnames = pj_param(P->ctx, P->params, "sgrids").s;
gMutex.lock();
const bool isKnownGrid = gKnownGrids.find(gridnames) != gKnownGrids.end();
gMutex.unlock();
if( isKnownGrid ) {
Q->defer_grid_opening = true;
}
else {
/* Build gridlist. P->vgridlist_geoid can be empty if +grids only ask for optional grids. */
Q->grids = pj_vgrid_init(P, "grids");
/* Was gridlist compiled properly? */
if ( proj_errno(P) ) {
proj_log_error(P, _("could not find required grid(s)."));
return destructor(P, PROJ_ERR_INVALID_OP_FILE_NOT_FOUND_OR_INVALID);
}
gMutex.lock();
gKnownGrids.insert(gridnames);
gMutex.unlock();
}
}
P->fwd4d = forward_4d;
P->inv4d = reverse_4d;
P->fwd3d = forward_3d;
P->inv3d = reverse_3d;
P->fwd = nullptr;
P->inv = nullptr;
P->left = PJ_IO_UNITS_RADIANS;
P->right = PJ_IO_UNITS_RADIANS;
return P;
}
void pj_clear_vgridshift_knowngrids_cache() {
NS_PROJ::lock_guard<NS_PROJ::mutex> lock(gMutex);
gKnownGrids.clear();
}
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