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#define PJ_LIB__
#include <errno.h>
#include <string.h>
#include <stddef.h>
#include <time.h>
#include "proj_internal.h"
#include "grids.hpp"
PROJ_HEAD(hgridshift, "Horizontal grid shift");
using namespace NS_PROJ;
#ifdef __MINGW32__
// mingw32-win32 doesn't implement std::mutex
namespace {
class MyMutex {
public:
// cppcheck-suppress functionStatic
void lock() { pj_acquire_lock(); }
// cppcheck-suppress functionStatic
void unlock() { pj_release_lock(); }
};
}
#else
#include <mutex>
#define MyMutex std::mutex
#endif
static MyMutex gMutex{};
static std::set<std::string> gKnownGrids{};
namespace { // anonymous namespace
struct hgridshiftData {
double t_final = 0;
double t_epoch = 0;
ListOfHGrids grids{};
bool defer_grid_opening = false;
};
} // anonymous namespace
static PJ_XYZ forward_3d(PJ_LPZ lpz, PJ *P) {
auto Q = static_cast<hgridshiftData*>(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_hgrid_init(P, "grids");
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.lp = pj_hgrid_apply(P->ctx, Q->grids, point.lp, PJ_FWD);
}
return point.xyz;
}
static PJ_LPZ reverse_3d(PJ_XYZ xyz, PJ *P) {
auto Q = static_cast<hgridshiftData*>(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_hgrid_init(P, "grids");
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.lp = pj_hgrid_apply(P->ctx, Q->grids, point.lp, PJ_INV);
}
return point.lpz;
}
static PJ_COORD forward_4d(PJ_COORD obs, PJ *P) {
struct hgridshiftData *Q = (struct hgridshiftData *) 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 hgridshiftData *Q = (struct hgridshiftData *) 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 hgridshiftData*>(P->opaque);
P->opaque = nullptr;
return pj_default_destructor(P, errlev);
}
static void reassign_context( PJ* P, PJ_CONTEXT* ctx )
{
auto Q = (struct hgridshiftData *) P->opaque;
for( auto& grid: Q->grids ) {
grid->reassign_context(ctx);
}
}
PJ *TRANSFORMATION(hgridshift,0) {
auto Q = new hgridshiftData;
P->opaque = (void *) Q;
P->destructor = destructor;
P->reassign_context = reassign_context;
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;
if (0==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;
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 {
Q->grids = pj_hgrid_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();
}
}
return P;
}
void pj_clear_hgridshift_knowngrids_cache() {
gMutex.lock();
gKnownGrids.clear();
gMutex.unlock();
}
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