/
rtpg_mapalgebra.c
7389 lines (6213 loc) · 200 KB
/
rtpg_mapalgebra.c
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/*
*
* WKTRaster - Raster Types for PostGIS
* http://trac.osgeo.org/postgis/wiki/WKTRaster
*
* Copyright (C) 2011-2013 Regents of the University of California
* <bkpark@ucdavis.edu>
* Copyright (C) 2010-2011 Jorge Arevalo <jorge.arevalo@deimos-space.com>
* Copyright (C) 2010-2011 David Zwarg <dzwarg@azavea.com>
* Copyright (C) 2009-2011 Pierre Racine <pierre.racine@sbf.ulaval.ca>
* Copyright (C) 2009-2011 Mateusz Loskot <mateusz@loskot.net>
* Copyright (C) 2008-2009 Sandro Santilli <strk@kbt.io>
* Copyright (C) 2013 Nathaniel Hunter Clay <clay.nathaniel@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <assert.h>
#include <postgres.h> /* for palloc */
#include <fmgr.h>
#include <funcapi.h>
#include <executor/spi.h>
#include <utils/lsyscache.h> /* for get_typlenbyvalalign */
#include <utils/array.h> /* for ArrayType */
#include <utils/builtins.h> /* for cstring_to_text */
#include <catalog/pg_type.h> /* for INT2OID, INT4OID, FLOAT4OID, FLOAT8OID and TEXTOID */
#include <executor/executor.h> /* for GetAttributeByName */
#include "../../postgis_config.h"
#include "lwgeom_pg.h"
#include "rtpostgis.h"
#include "rtpg_internal.h"
/* n-raster MapAlgebra */
Datum RASTER_nMapAlgebra(PG_FUNCTION_ARGS);
Datum RASTER_nMapAlgebraExpr(PG_FUNCTION_ARGS);
/* raster union aggregate */
Datum RASTER_union_transfn(PG_FUNCTION_ARGS);
Datum RASTER_union_finalfn(PG_FUNCTION_ARGS);
/* raster clip */
Datum RASTER_clip(PG_FUNCTION_ARGS);
/* reclassify specified bands of a raster */
Datum RASTER_reclass(PG_FUNCTION_ARGS);
/* apply colormap to specified band of a raster */
Datum RASTER_colorMap(PG_FUNCTION_ARGS);
/* one-raster MapAlgebra */
Datum RASTER_mapAlgebraExpr(PG_FUNCTION_ARGS);
Datum RASTER_mapAlgebraFct(PG_FUNCTION_ARGS);
/* one-raster neighborhood MapAlgebra */
Datum RASTER_mapAlgebraFctNgb(PG_FUNCTION_ARGS);
/* two-raster MapAlgebra */
Datum RASTER_mapAlgebra2(PG_FUNCTION_ARGS);
/* ---------------------------------------------------------------- */
/* n-raster MapAlgebra */
/* ---------------------------------------------------------------- */
typedef struct {
Oid ufc_noid;
Oid ufc_rettype;
FmgrInfo ufl_info;
#if POSTGIS_PGSQL_VERSION < 120
FunctionCallInfoData ufc_info;
#else
/* copied from LOCAL_FCINFO in fmgr.h */
union {
FunctionCallInfoBaseData fcinfo;
char fcinfo_data[SizeForFunctionCallInfo(FUNC_MAX_ARGS)]; /* Could be optimized */
} ufc_info_data;
FunctionCallInfo ufc_info;
#endif
} rtpg_nmapalgebra_callback_arg;
typedef struct rtpg_nmapalgebra_arg_t *rtpg_nmapalgebra_arg;
struct rtpg_nmapalgebra_arg_t {
int numraster;
rt_pgraster **pgraster;
rt_raster *raster;
uint8_t *isempty; /* flag indicating if raster is empty */
uint8_t *ownsdata; /* is the raster self owned or just a pointer to another raster */
int *nband; /* source raster's band index, 0-based */
uint8_t *hasband; /* does source raster have band at index nband? */
rt_pixtype pixtype; /* output raster band's pixel type */
int hasnodata; /* NODATA flag */
double nodataval; /* NODATA value */
int distance[2]; /* distance in X and Y axis */
rt_extenttype extenttype; /* ouput raster's extent type */
rt_pgraster *pgcextent; /* custom extent of type rt_pgraster */
rt_raster cextent; /* custom extent of type rt_raster */
rt_mask mask; /* mask for the nmapalgebra operation */
rtpg_nmapalgebra_callback_arg callback;
};
static rtpg_nmapalgebra_arg rtpg_nmapalgebra_arg_init() {
rtpg_nmapalgebra_arg arg = NULL;
arg = palloc(sizeof(struct rtpg_nmapalgebra_arg_t));
if (arg == NULL) {
elog(ERROR, "rtpg_nmapalgebra_arg_init: Could not allocate memory for arguments");
return NULL;
}
arg->numraster = 0;
arg->pgraster = NULL;
arg->raster = NULL;
arg->isempty = NULL;
arg->ownsdata = NULL;
arg->nband = NULL;
arg->hasband = NULL;
arg->pixtype = PT_END;
arg->hasnodata = 1;
arg->nodataval = 0;
arg->distance[0] = 0;
arg->distance[1] = 0;
arg->extenttype = ET_INTERSECTION;
arg->pgcextent = NULL;
arg->cextent = NULL;
arg->mask = NULL;
#if POSTGIS_PGSQL_VERSION >= 120
arg->callback.ufc_info = &(arg->callback.ufc_info_data.fcinfo);
#endif
arg->callback.ufc_noid = InvalidOid;
arg->callback.ufc_rettype = InvalidOid;
return arg;
}
static void rtpg_nmapalgebra_arg_destroy(rtpg_nmapalgebra_arg arg) {
int i = 0;
if (arg->raster != NULL) {
for (i = 0; i < arg->numraster; i++) {
if (arg->raster[i] == NULL || !arg->ownsdata[i])
continue;
rt_raster_destroy(arg->raster[i]);
}
pfree(arg->raster);
pfree(arg->pgraster);
pfree(arg->isempty);
pfree(arg->ownsdata);
pfree(arg->nband);
}
if (arg->cextent != NULL)
rt_raster_destroy(arg->cextent);
if( arg->mask != NULL )
pfree(arg->mask);
pfree(arg);
}
static int rtpg_nmapalgebra_rastbandarg_process(rtpg_nmapalgebra_arg arg, ArrayType *array, int *allnull, int *allempty, int *noband) {
Oid etype;
Datum *e;
bool *nulls;
int16 typlen;
bool typbyval;
char typalign;
int n = 0;
HeapTupleHeader tup;
bool isnull;
Datum tupv;
int i;
int j;
int nband;
if (arg == NULL || array == NULL) {
elog(ERROR, "rtpg_nmapalgebra_rastbandarg_process: NULL values not permitted for parameters");
return 0;
}
etype = ARR_ELEMTYPE(array);
get_typlenbyvalalign(etype, &typlen, &typbyval, &typalign);
deconstruct_array(
array,
etype,
typlen, typbyval, typalign,
&e, &nulls, &n
);
if (!n) {
elog(ERROR, "rtpg_nmapalgebra_rastbandarg_process: Invalid argument for rastbandarg");
return 0;
}
/* prep arg */
arg->numraster = n;
arg->pgraster = palloc(sizeof(rt_pgraster *) * arg->numraster);
arg->raster = palloc(sizeof(rt_raster) * arg->numraster);
arg->isempty = palloc(sizeof(uint8_t) * arg->numraster);
arg->ownsdata = palloc(sizeof(uint8_t) * arg->numraster);
arg->nband = palloc(sizeof(int) * arg->numraster);
arg->hasband = palloc(sizeof(uint8_t) * arg->numraster);
arg->mask = palloc(sizeof(struct rt_mask_t));
if (
arg->pgraster == NULL ||
arg->raster == NULL ||
arg->isempty == NULL ||
arg->ownsdata == NULL ||
arg->nband == NULL ||
arg->hasband == NULL ||
arg->mask == NULL
) {
elog(ERROR, "rtpg_nmapalgebra_rastbandarg_process: Could not allocate memory for processing rastbandarg");
return 0;
}
*allnull = 0;
*allempty = 0;
*noband = 0;
/* process each element */
for (i = 0; i < n; i++) {
if (nulls[i]) {
arg->numraster--;
continue;
}
POSTGIS_RT_DEBUGF(4, "Processing rastbandarg at index %d", i);
arg->raster[i] = NULL;
arg->isempty[i] = 0;
arg->ownsdata[i] = 1;
arg->nband[i] = 0;
arg->hasband[i] = 0;
/* each element is a tuple */
tup = (HeapTupleHeader) DatumGetPointer(e[i]);
if (NULL == tup) {
elog(ERROR, "rtpg_nmapalgebra_rastbandarg_process: Invalid argument for rastbandarg at index %d", i);
return 0;
}
/* first element, raster */
POSTGIS_RT_DEBUG(4, "Processing first element (raster)");
tupv = GetAttributeByName(tup, "rast", &isnull);
if (isnull) {
elog(NOTICE, "First argument (nband) of rastbandarg at index %d is NULL. Assuming NULL raster", i);
arg->isempty[i] = 1;
arg->ownsdata[i] = 0;
(*allnull)++;
(*allempty)++;
(*noband)++;
continue;
}
arg->pgraster[i] = (rt_pgraster *) PG_DETOAST_DATUM(tupv);
/* see if this is a copy of an existing pgraster */
for (j = 0; j < i; j++) {
if (!arg->isempty[j] && (arg->pgraster[i] == arg->pgraster[j])) {
POSTGIS_RT_DEBUG(4, "raster matching existing same raster found");
arg->raster[i] = arg->raster[j];
arg->ownsdata[i] = 0;
break;
}
}
if (arg->ownsdata[i]) {
POSTGIS_RT_DEBUG(4, "deserializing raster");
arg->raster[i] = rt_raster_deserialize(arg->pgraster[i], FALSE);
if (arg->raster[i] == NULL) {
elog(ERROR, "rtpg_nmapalgebra_rastbandarg_process: Could not deserialize raster at index %d", i);
return 0;
}
}
/* is raster empty? */
arg->isempty[i] = rt_raster_is_empty(arg->raster[i]);
if (arg->isempty[i]) {
(*allempty)++;
(*noband)++;
continue;
}
/* second element, nband */
POSTGIS_RT_DEBUG(4, "Processing second element (nband)");
tupv = GetAttributeByName(tup, "nband", &isnull);
if (isnull) {
nband = 1;
elog(NOTICE, "First argument (nband) of rastbandarg at index %d is NULL. Assuming nband = %d", i, nband);
}
else
nband = DatumGetInt32(tupv);
if (nband < 1) {
elog(ERROR, "rtpg_nmapalgebra_rastbandarg_process: Band number provided for rastbandarg at index %d must be greater than zero (1-based)", i);
return 0;
}
arg->nband[i] = nband - 1;
arg->hasband[i] = rt_raster_has_band(arg->raster[i], arg->nband[i]);
if (!arg->hasband[i]) {
(*noband)++;
POSTGIS_RT_DEBUGF(4, "Band at index %d not found in raster", nband);
}
}
if (arg->numraster < n) {
arg->pgraster = repalloc(arg->pgraster, sizeof(rt_pgraster *) * arg->numraster);
arg->raster = repalloc(arg->raster, sizeof(rt_raster) * arg->numraster);
arg->isempty = repalloc(arg->isempty, sizeof(uint8_t) * arg->numraster);
arg->ownsdata = repalloc(arg->ownsdata, sizeof(uint8_t) * arg->numraster);
arg->nband = repalloc(arg->nband, sizeof(int) * arg->numraster);
arg->hasband = repalloc(arg->hasband, sizeof(uint8_t) * arg->numraster);
if (
arg->pgraster == NULL ||
arg->raster == NULL ||
arg->isempty == NULL ||
arg->ownsdata == NULL ||
arg->nband == NULL ||
arg->hasband == NULL
) {
elog(ERROR, "rtpg_nmapalgebra_rastbandarg_process: Could not reallocate memory for processed rastbandarg");
return 0;
}
}
POSTGIS_RT_DEBUGF(4, "arg->numraster = %d", arg->numraster);
return 1;
}
/*
Callback for RASTER_nMapAlgebra
*/
static int rtpg_nmapalgebra_callback(
rt_iterator_arg arg, void *userarg,
double *value, int *nodata
) {
rtpg_nmapalgebra_callback_arg *callback = (rtpg_nmapalgebra_callback_arg *) userarg;
int16 typlen;
bool typbyval;
char typalign;
ArrayType *mdValues = NULL;
Datum *_values = NULL;
bool *_nodata = NULL;
ArrayType *mdPos = NULL;
Datum *_pos = NULL;
bool *_null = NULL;
int i = 0;
uint32_t x = 0;
uint32_t y = 0;
int z = 0;
int dim[3] = {0};
int lbound[3] = {1, 1, 1};
Datum datum = (Datum) NULL;
if (arg == NULL)
return 0;
*value = 0;
*nodata = 0;
dim[0] = arg->rasters;
dim[1] = arg->rows;
dim[2] = arg->columns;
_values = palloc(sizeof(Datum) * arg->rasters * arg->rows * arg->columns);
_nodata = palloc(sizeof(bool) * arg->rasters * arg->rows * arg->columns);
if (_values == NULL || _nodata == NULL) {
elog(ERROR, "rtpg_nmapalgebra_callback: Could not allocate memory for values array");
return 0;
}
/* build mdValues */
i = 0;
/* raster */
for (z = 0; z < arg->rasters; z++) {
/* Y axis */
for (y = 0; y < arg->rows; y++) {
/* X axis */
for (x = 0; x < arg->columns; x++) {
POSTGIS_RT_DEBUGF(4, "(z, y ,x) = (%d, %d, %d)", z, y, x);
POSTGIS_RT_DEBUGF(4, "(value, nodata) = (%f, %d)", arg->values[z][y][x], arg->nodata[z][y][x]);
_nodata[i] = (bool) arg->nodata[z][y][x];
if (!_nodata[i])
_values[i] = Float8GetDatum(arg->values[z][y][x]);
else
_values[i] = (Datum) NULL;
i++;
}
}
}
/* info about the type of item in the multi-dimensional array (float8). */
get_typlenbyvalalign(FLOAT8OID, &typlen, &typbyval, &typalign);
/* construct mdValues */
mdValues = construct_md_array(
_values, _nodata,
3, dim, lbound,
FLOAT8OID,
typlen, typbyval, typalign
);
pfree(_nodata);
pfree(_values);
_pos = palloc(sizeof(Datum) * (arg->rasters + 1) * 2);
_null = palloc(sizeof(bool) * (arg->rasters + 1) * 2);
if (_pos == NULL || _null == NULL) {
pfree(mdValues);
elog(ERROR, "rtpg_nmapalgebra_callback: Could not allocate memory for position array");
return 0;
}
memset(_null, 0, sizeof(bool) * (arg->rasters + 1) * 2);
/* build mdPos */
i = 0;
_pos[i] = arg->dst_pixel[0] + 1;
i++;
_pos[i] = arg->dst_pixel[1] + 1;
i++;
for (z = 0; z < arg->rasters; z++) {
_pos[i] = arg->src_pixel[z][0] + 1;
i++;
_pos[i] = arg->src_pixel[z][1] + 1;
i++;
}
/* info about the type of item in the multi-dimensional array (int4). */
get_typlenbyvalalign(INT4OID, &typlen, &typbyval, &typalign);
/* reuse dim and lbound, just tweak to what we need */
dim[0] = arg->rasters + 1;
dim[1] = 2;
lbound[0] = 0;
/* construct mdPos */
mdPos = construct_md_array(
_pos, _null,
2, dim, lbound,
INT4OID,
typlen, typbyval, typalign
);
pfree(_pos);
pfree(_null);
#if POSTGIS_PGSQL_VERSION < 120
callback->ufc_info.arg[0] = PointerGetDatum(mdValues);
callback->ufc_info.arg[1] = PointerGetDatum(mdPos);
#else
callback->ufc_info->args[0].value = PointerGetDatum(mdValues);
callback->ufc_info->args[1].value = PointerGetDatum(mdPos);
#endif
/* call user callback function */
#if POSTGIS_PGSQL_VERSION < 120
datum = FunctionCallInvoke(&(callback->ufc_info));
#else
datum = FunctionCallInvoke(callback->ufc_info);
#endif
pfree(mdValues);
pfree(mdPos);
/* result is not null*/
#if POSTGIS_PGSQL_VERSION < 120
if (!callback->ufc_info.isnull) {
#else
if (!callback->ufc_info->isnull)
{
#endif
switch (callback->ufc_rettype) {
case FLOAT8OID:
*value = DatumGetFloat8(datum);
break;
case FLOAT4OID:
*value = (double) DatumGetFloat4(datum);
break;
case INT4OID:
*value = (double) DatumGetInt32(datum);
break;
case INT2OID:
*value = (double) DatumGetInt16(datum);
break;
}
}
else
*nodata = 1;
return 1;
}
/*
ST_MapAlgebra for n rasters
*/
PG_FUNCTION_INFO_V1(RASTER_nMapAlgebra);
Datum RASTER_nMapAlgebra(PG_FUNCTION_ARGS)
{
rtpg_nmapalgebra_arg arg = NULL;
rt_iterator itrset;
ArrayType *maskArray;
Oid etype;
Datum *maskElements;
bool *maskNulls;
int16 typlen;
bool typbyval;
char typalign;
int ndims = 0;
int num;
int *maskDims;
int x,y;
int i = 0;
int noerr = 0;
int allnull = 0;
int allempty = 0;
int noband = 0;
rt_raster raster = NULL;
rt_band band = NULL;
rt_pgraster *pgraster = NULL;
POSTGIS_RT_DEBUG(3, "Starting...");
if (PG_ARGISNULL(0))
PG_RETURN_NULL();
/* init argument struct */
arg = rtpg_nmapalgebra_arg_init();
if (arg == NULL) {
elog(ERROR, "RASTER_nMapAlgebra: Could not initialize argument structure");
PG_RETURN_NULL();
}
/* let helper function process rastbandarg (0) */
if (!rtpg_nmapalgebra_rastbandarg_process(arg, PG_GETARG_ARRAYTYPE_P(0), &allnull, &allempty, &noband)) {
rtpg_nmapalgebra_arg_destroy(arg);
elog(ERROR, "RASTER_nMapAlgebra: Could not process rastbandarg");
PG_RETURN_NULL();
}
POSTGIS_RT_DEBUGF(4, "allnull, allempty, noband = %d, %d, %d", allnull, allempty, noband);
/* all rasters are NULL, return NULL */
if (allnull == arg->numraster) {
elog(NOTICE, "All input rasters are NULL. Returning NULL");
rtpg_nmapalgebra_arg_destroy(arg);
PG_RETURN_NULL();
}
/* pixel type (2) */
if (!PG_ARGISNULL(2)) {
char *pixtypename = text_to_cstring(PG_GETARG_TEXT_P(2));
/* Get the pixel type index */
arg->pixtype = rt_pixtype_index_from_name(pixtypename);
if (arg->pixtype == PT_END) {
rtpg_nmapalgebra_arg_destroy(arg);
elog(ERROR, "RASTER_nMapAlgebra: Invalid pixel type: %s", pixtypename);
PG_RETURN_NULL();
}
}
/* distancex (3) */
if (!PG_ARGISNULL(3)){
arg->distance[0] = PG_GETARG_INT32(3);
}else{
arg->distance[0] = 0;
}
/* distancey (4) */
if (!PG_ARGISNULL(4)){
arg->distance[1] = PG_GETARG_INT32(4);
}else{
arg->distance[1] = 0;
}
if (arg->distance[0] < 0 || arg->distance[1] < 0) {
rtpg_nmapalgebra_arg_destroy(arg);
elog(ERROR, "RASTER_nMapAlgebra: Distance for X and Y axis must be greater than or equal to zero");
PG_RETURN_NULL();
}
/* extent type (5) */
if (!PG_ARGISNULL(5)) {
char *extenttypename = rtpg_strtoupper(rtpg_trim(text_to_cstring(PG_GETARG_TEXT_P(5))));
arg->extenttype = rt_util_extent_type(extenttypename);
}
POSTGIS_RT_DEBUGF(4, "extenttype: %d", arg->extenttype);
/* custom extent (6) */
if (arg->extenttype == ET_CUSTOM) {
if (PG_ARGISNULL(6)) {
elog(NOTICE, "Custom extent is NULL. Returning NULL");
rtpg_nmapalgebra_arg_destroy(arg);
PG_RETURN_NULL();
}
arg->pgcextent = (rt_pgraster *) PG_DETOAST_DATUM(PG_GETARG_DATUM(6));
/* only need the raster header */
arg->cextent = rt_raster_deserialize(arg->pgcextent, TRUE);
if (arg->cextent == NULL) {
rtpg_nmapalgebra_arg_destroy(arg);
elog(ERROR, "RASTER_nMapAlgebra: Could not deserialize custom extent");
PG_RETURN_NULL();
}
else if (rt_raster_is_empty(arg->cextent)) {
elog(NOTICE, "Custom extent is an empty raster. Returning empty raster");
rtpg_nmapalgebra_arg_destroy(arg);
raster = rt_raster_new(0, 0);
if (raster == NULL) {
elog(ERROR, "RASTER_nMapAlgebra: Could not create empty raster");
PG_RETURN_NULL();
}
pgraster = rt_raster_serialize(raster);
rt_raster_destroy(raster);
if (!pgraster) PG_RETURN_NULL();
SET_VARSIZE(pgraster, pgraster->size);
PG_RETURN_POINTER(pgraster);
}
}
/* mask (7) */
if( PG_ARGISNULL(7) ){
pfree(arg->mask);
arg->mask = NULL;
}
else {
maskArray = PG_GETARG_ARRAYTYPE_P(7);
etype = ARR_ELEMTYPE(maskArray);
get_typlenbyvalalign(etype,&typlen,&typbyval,&typalign);
switch (etype) {
case FLOAT4OID:
case FLOAT8OID:
break;
default:
rtpg_nmapalgebra_arg_destroy(arg);
elog(ERROR,"RASTER_nMapAlgebra: Mask data type must be FLOAT8 or FLOAT4");
PG_RETURN_NULL();
}
ndims = ARR_NDIM(maskArray);
if (ndims != 2) {
elog(ERROR, "RASTER_nMapAlgebra: Mask Must be a 2D array");
rtpg_nmapalgebra_arg_destroy(arg);
PG_RETURN_NULL();
}
maskDims = ARR_DIMS(maskArray);
if (maskDims[0] % 2 == 0 || maskDims[1] % 2 == 0) {
elog(ERROR,"RASTER_nMapAlgebra: Mask dimensions must be odd");
rtpg_nmapalgebra_arg_destroy(arg);
PG_RETURN_NULL();
}
deconstruct_array(
maskArray,
etype,
typlen, typbyval,typalign,
&maskElements,&maskNulls,&num
);
if (num < 1 || num != (maskDims[0] * maskDims[1])) {
if (num) {
pfree(maskElements);
pfree(maskNulls);
}
elog(ERROR, "RASTER_nMapAlgebra: Could not deconstruct new values array");
rtpg_nmapalgebra_arg_destroy(arg);
PG_RETURN_NULL();
}
/* allocate mem for mask array */
arg->mask->values = palloc(sizeof(double*)* maskDims[0]);
arg->mask->nodata = palloc(sizeof(int*)*maskDims[0]);
for (i = 0; i < maskDims[0]; i++) {
arg->mask->values[i] = (double*) palloc(sizeof(double) * maskDims[1]);
arg->mask->nodata[i] = (int*) palloc(sizeof(int) * maskDims[1]);
}
/* place values in to mask */
i = 0;
for (y = 0; y < maskDims[0]; y++) {
for (x = 0; x < maskDims[1]; x++) {
if (maskNulls[i]) {
arg->mask->values[y][x] = 0;
arg->mask->nodata[y][x] = 1;
}
else {
switch (etype) {
case FLOAT4OID:
arg->mask->values[y][x] = (double) DatumGetFloat4(maskElements[i]);
arg->mask->nodata[y][x] = 0;
break;
case FLOAT8OID:
arg->mask->values[y][x] = (double) DatumGetFloat8(maskElements[i]);
arg->mask->nodata[y][x] = 0;
}
}
i++;
}
}
/*set mask dimensions*/
arg->mask->dimx = maskDims[0];
arg->mask->dimy = maskDims[1];
if (maskDims[0] == 1 && maskDims[1] == 1) {
arg->distance[0] = 0;
arg->distance[1] = 0;
}
else {
arg->distance[0] = maskDims[0] % 2;
arg->distance[1] = maskDims[1] % 2;
}
}/*end if else argisnull*/
/* (8) weighted boolean */
if (PG_ARGISNULL(8) || !PG_GETARG_BOOL(8)) {
if (arg->mask != NULL)
arg->mask->weighted = 0;
}else{
if(arg->mask !=NULL)
arg->mask->weighted = 1;
}
noerr = 1;
/* all rasters are empty, return empty raster */
if (allempty == arg->numraster) {
elog(NOTICE, "All input rasters are empty. Returning empty raster");
noerr = 0;
}
/* all rasters don't have indicated band, return empty raster */
else if (noband == arg->numraster) {
elog(NOTICE, "All input rasters do not have bands at indicated indexes. Returning empty raster");
noerr = 0;
}
if (!noerr) {
rtpg_nmapalgebra_arg_destroy(arg);
raster = rt_raster_new(0, 0);
if (raster == NULL) {
elog(ERROR, "RASTER_nMapAlgebra: Could not create empty raster");
PG_RETURN_NULL();
}
pgraster = rt_raster_serialize(raster);
rt_raster_destroy(raster);
if (!pgraster) PG_RETURN_NULL();
SET_VARSIZE(pgraster, pgraster->size);
PG_RETURN_POINTER(pgraster);
}
/* do regprocedure last (1) */
if (!PG_ARGISNULL(1) || get_fn_expr_argtype(fcinfo->flinfo, 1) == REGPROCEDUREOID) {
POSTGIS_RT_DEBUG(4, "processing callbackfunc");
arg->callback.ufc_noid = PG_GETARG_OID(1);
/* get function info */
fmgr_info(arg->callback.ufc_noid, &(arg->callback.ufl_info));
/* function cannot return set */
noerr = 0;
if (arg->callback.ufl_info.fn_retset) {
noerr = 1;
}
/* function should have correct # of args */
else if (arg->callback.ufl_info.fn_nargs != 3) {
noerr = 2;
}
/* check that callback function return type is supported */
if (
get_func_result_type(
arg->callback.ufc_noid,
&(arg->callback.ufc_rettype),
NULL
) != TYPEFUNC_SCALAR
) {
noerr = 3;
}
if (!(
arg->callback.ufc_rettype == FLOAT8OID ||
arg->callback.ufc_rettype == FLOAT4OID ||
arg->callback.ufc_rettype == INT4OID ||
arg->callback.ufc_rettype == INT2OID
)) {
noerr = 4;
}
/*
TODO: consider adding checks of the userfunction parameters
should be able to use get_fn_expr_argtype() of fmgr.c
*/
if (noerr != 0) {
rtpg_nmapalgebra_arg_destroy(arg);
switch (noerr) {
case 4:
elog(ERROR, "RASTER_nMapAlgebra: Function provided must return a double precision, float, int or smallint");
break;
case 3:
elog(ERROR, "RASTER_nMapAlgebra: Function provided must return scalar (double precision, float, int, smallint)");
break;
case 2:
elog(ERROR, "RASTER_nMapAlgebra: Function provided must have three input parameters");
break;
case 1:
elog(ERROR, "RASTER_nMapAlgebra: Function provided must return double precision, not resultset");
break;
}
PG_RETURN_NULL();
}
if (func_volatile(arg->callback.ufc_noid) == 'v')
elog(NOTICE, "Function provided is VOLATILE. Unless required and for best performance, function should be IMMUTABLE or STABLE");
/* prep function call data */
#if POSTGIS_PGSQL_VERSION < 120
InitFunctionCallInfoData(arg->callback.ufc_info, &(arg->callback.ufl_info), arg->callback.ufl_info.fn_nargs, InvalidOid, NULL, NULL);
memset(arg->callback.ufc_info.argnull, FALSE, sizeof(bool) * arg->callback.ufl_info.fn_nargs);
#else
InitFunctionCallInfoData(*(arg->callback.ufc_info),
&(arg->callback.ufl_info),
arg->callback.ufl_info.fn_nargs,
InvalidOid,
NULL,
NULL);
arg->callback.ufc_info->args[0].isnull = FALSE;
arg->callback.ufc_info->args[1].isnull = FALSE;
arg->callback.ufc_info->args[2].isnull = FALSE;
#endif
/* userargs (7) */
if (!PG_ARGISNULL(9))
#if POSTGIS_PGSQL_VERSION < 120
arg->callback.ufc_info.arg[2] = PG_GETARG_DATUM(9);
#else
arg->callback.ufc_info->args[2].value = PG_GETARG_DATUM(9);
#endif
else {
if (arg->callback.ufl_info.fn_strict) {
/* build and assign an empty TEXT array */
/* TODO: manually free the empty array? */
#if POSTGIS_PGSQL_VERSION < 120
arg->callback.ufc_info.arg[2] = PointerGetDatum(
construct_empty_array(TEXTOID)
);
arg->callback.ufc_info.argnull[2] = FALSE;
#else
arg->callback.ufc_info->args[2].value = PointerGetDatum(construct_empty_array(TEXTOID));
arg->callback.ufc_info->args[2].isnull = FALSE;
#endif
}
else {
#if POSTGIS_PGSQL_VERSION < 120
arg->callback.ufc_info.arg[2] = (Datum) NULL;
arg->callback.ufc_info.argnull[2] = TRUE;
#else
arg->callback.ufc_info->args[2].value = (Datum)NULL;
arg->callback.ufc_info->args[2].isnull = TRUE;
#endif
}
}
}
else {
rtpg_nmapalgebra_arg_destroy(arg);
elog(ERROR, "RASTER_nMapAlgebra: callbackfunc must be provided");
PG_RETURN_NULL();
}
/* determine nodataval and possibly pixtype */
/* band to check */
switch (arg->extenttype) {
case ET_LAST:
i = arg->numraster - 1;
break;
case ET_SECOND:
i = (arg->numraster > 1) ? 1 : 0;
break;
default:
i = 0;
break;
}
/* find first viable band */
if (!arg->hasband[i]) {
for (i = 0; i < arg->numraster; i++) {
if (arg->hasband[i])
break;
}
if (i >= arg->numraster)
i = arg->numraster - 1;
}
band = rt_raster_get_band(arg->raster[i], arg->nband[i]);
/* set pixel type if PT_END */
if (arg->pixtype == PT_END)
arg->pixtype = rt_band_get_pixtype(band);
/* set hasnodata and nodataval */
arg->hasnodata = 1;
if (rt_band_get_hasnodata_flag(band))
rt_band_get_nodata(band, &(arg->nodataval));
else
arg->nodataval = rt_band_get_min_value(band);
POSTGIS_RT_DEBUGF(4, "pixtype, hasnodata, nodataval: %s, %d, %f", rt_pixtype_name(arg->pixtype), arg->hasnodata, arg->nodataval);
/* init itrset */
itrset = palloc(sizeof(struct rt_iterator_t) * arg->numraster);
if (itrset == NULL) {
rtpg_nmapalgebra_arg_destroy(arg);
elog(ERROR, "RASTER_nMapAlgebra: Could not allocate memory for iterator arguments");
PG_RETURN_NULL();
}
/* set itrset */
for (i = 0; i < arg->numraster; i++) {
itrset[i].raster = arg->raster[i];
itrset[i].nband = arg->nband[i];
itrset[i].nbnodata = 1;
}
/* pass everything to iterator */
noerr = rt_raster_iterator(
itrset, arg->numraster,
arg->extenttype, arg->cextent,
arg->pixtype,
arg->hasnodata, arg->nodataval,
arg->distance[0], arg->distance[1],
arg->mask,
&(arg->callback),
rtpg_nmapalgebra_callback,
&raster
);
/* cleanup */
pfree(itrset);
rtpg_nmapalgebra_arg_destroy(arg);
if (noerr != ES_NONE) {
elog(ERROR, "RASTER_nMapAlgebra: Could not run raster iterator function");
PG_RETURN_NULL();
}
else if (raster == NULL)
PG_RETURN_NULL();
pgraster = rt_raster_serialize(raster);
rt_raster_destroy(raster);
POSTGIS_RT_DEBUG(3, "Finished");