1 /*
2 *
3 * WKTRaster - Raster Types for PostGIS
4 * http://trac.osgeo.org/postgis/wiki/WKTRaster
5 *
6 * Copyright (C) 2011-2013 Regents of the University of California
7 * <bkpark@ucdavis.edu>
8 * Copyright (C) 2010-2011 Jorge Arevalo <jorge.arevalo@deimos-space.com>
9 * Copyright (C) 2010-2011 David Zwarg <dzwarg@azavea.com>
10 * Copyright (C) 2009-2011 Pierre Racine <pierre.racine@sbf.ulaval.ca>
11 * Copyright (C) 2009-2011 Mateusz Loskot <mateusz@loskot.net>
12 * Copyright (C) 2008-2009 Sandro Santilli <strk@kbt.io>
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version 2
17 * of the License, or (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software Foundation,
26 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
27 *
28 */
29
30 #include <postgres.h>
31 #include <fmgr.h>
32 #include "utils/lsyscache.h" /* for get_typlenbyvalalign */
33 #include <funcapi.h>
34 #include "utils/array.h" /* for ArrayType */
35 #include "catalog/pg_type.h" /* for INT2OID, INT4OID, FLOAT4OID, FLOAT8OID and TEXTOID */
36
37 #include "../../postgis_config.h"
38 #include "lwgeom_pg.h"
39
40
41
42 #include "access/htup_details.h" /* for heap_form_tuple() */
43
44
45 #include "rtpostgis.h"
46
47 /* Get pixel value */
48 Datum RASTER_getPixelValue(PG_FUNCTION_ARGS);
49 Datum RASTER_dumpValues(PG_FUNCTION_ARGS);
50
51 /* Set pixel value(s) */
52 Datum RASTER_setPixelValue(PG_FUNCTION_ARGS);
53 Datum RASTER_setPixelValuesArray(PG_FUNCTION_ARGS);
54 Datum RASTER_setPixelValuesGeomval(PG_FUNCTION_ARGS);
55
56 /* Get pixels of value */
57 Datum RASTER_pixelOfValue(PG_FUNCTION_ARGS);
58
59 /* Get nearest value to a point */
60 Datum RASTER_nearestValue(PG_FUNCTION_ARGS);
61
62 /* Get the neighborhood around a pixel */
63 Datum RASTER_neighborhood(PG_FUNCTION_ARGS);
64
65 /**
66 * Return value of a single pixel.
67 * Pixel location is specified by 1-based index of Nth band of raster and
68 * X,Y coordinates (X <= RT_Width(raster) and Y <= RT_Height(raster)).
69 *
70 * TODO: Should we return NUMERIC instead of FLOAT8 ?
71 */
72 PG_FUNCTION_INFO_V1(RASTER_getPixelValue);
RASTER_getPixelValue(PG_FUNCTION_ARGS)73 Datum RASTER_getPixelValue(PG_FUNCTION_ARGS)
74 {
75 rt_pgraster *pgraster = NULL;
76 rt_raster raster = NULL;
77 rt_band band = NULL;
78 double pixvalue = 0;
79 int32_t bandindex = 0;
80 int32_t x = 0;
81 int32_t y = 0;
82 int result = 0;
83 bool exclude_nodata_value = TRUE;
84 int isnodata = 0;
85
86 /* Index is 1-based */
87 bandindex = PG_GETARG_INT32(1);
88 if ( bandindex < 1 ) {
89 elog(NOTICE, "Invalid band index (must use 1-based). Returning NULL");
90 PG_RETURN_NULL();
91 }
92
93 x = PG_GETARG_INT32(2);
94
95 y = PG_GETARG_INT32(3);
96
97 exclude_nodata_value = PG_GETARG_BOOL(4);
98
99 POSTGIS_RT_DEBUGF(3, "Pixel coordinates (%d, %d)", x, y);
100
101 /* Deserialize raster */
102 if (PG_ARGISNULL(0)) PG_RETURN_NULL();
103 pgraster = (rt_pgraster *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
104
105 raster = rt_raster_deserialize(pgraster, FALSE);
106 if (!raster) {
107 PG_FREE_IF_COPY(pgraster, 0);
108 elog(ERROR, "RASTER_getPixelValue: Could not deserialize raster");
109 PG_RETURN_NULL();
110 }
111
112 /* Fetch Nth band using 0-based internal index */
113 band = rt_raster_get_band(raster, bandindex - 1);
114 if (! band) {
115 elog(NOTICE, "Could not find raster band of index %d when getting pixel "
116 "value. Returning NULL", bandindex);
117 rt_raster_destroy(raster);
118 PG_FREE_IF_COPY(pgraster, 0);
119 PG_RETURN_NULL();
120 }
121 /* Fetch pixel using 0-based coordinates */
122 result = rt_band_get_pixel(band, x - 1, y - 1, &pixvalue, &isnodata);
123
124 /* If the result is -1 or the value is nodata and we take nodata into account
125 * then return nodata = NULL */
126 if (result != ES_NONE || (exclude_nodata_value && isnodata)) {
127 rt_raster_destroy(raster);
128 PG_FREE_IF_COPY(pgraster, 0);
129 PG_RETURN_NULL();
130 }
131
132 rt_raster_destroy(raster);
133 PG_FREE_IF_COPY(pgraster, 0);
134
135 PG_RETURN_FLOAT8(pixvalue);
136 }
137
138 /* ---------------------------------------------------------------- */
139 /* ST_DumpValues function */
140 /* ---------------------------------------------------------------- */
141
142 typedef struct rtpg_dumpvalues_arg_t *rtpg_dumpvalues_arg;
143 struct rtpg_dumpvalues_arg_t {
144 int numbands;
145 int rows;
146 int columns;
147
148 int *nbands; /* 0-based */
149 Datum **values;
150 bool **nodata;
151 };
152
rtpg_dumpvalues_arg_init()153 static rtpg_dumpvalues_arg rtpg_dumpvalues_arg_init() {
154 rtpg_dumpvalues_arg arg = NULL;
155
156 arg = palloc(sizeof(struct rtpg_dumpvalues_arg_t));
157 if (arg == NULL) {
158 elog(ERROR, "rtpg_dumpvalues_arg_init: Could not allocate memory for arguments");
159 return NULL;
160 }
161
162 arg->numbands = 0;
163 arg->rows = 0;
164 arg->columns = 0;
165
166 arg->nbands = NULL;
167 arg->values = NULL;
168 arg->nodata = NULL;
169
170 return arg;
171 }
172
rtpg_dumpvalues_arg_destroy(rtpg_dumpvalues_arg arg)173 static void rtpg_dumpvalues_arg_destroy(rtpg_dumpvalues_arg arg) {
174 int i = 0;
175
176 if (arg->numbands > 0) {
177 if (arg->nbands != NULL)
178 pfree(arg->nbands);
179
180 if (arg->values != NULL) {
181 for (i = 0; i < arg->numbands; i++) {
182
183 if (arg->values[i] != NULL)
184 pfree(arg->values[i]);
185
186 if (arg->nodata[i] != NULL)
187 pfree(arg->nodata[i]);
188 }
189
190 pfree(arg->values);
191 }
192
193 if (arg->nodata != NULL)
194 pfree(arg->nodata);
195 }
196
197 pfree(arg);
198 }
199
200 #define VALUES_LENGTH 2
201
202 PG_FUNCTION_INFO_V1(RASTER_dumpValues);
RASTER_dumpValues(PG_FUNCTION_ARGS)203 Datum RASTER_dumpValues(PG_FUNCTION_ARGS)
204 {
205 FuncCallContext *funcctx;
206 TupleDesc tupdesc;
207 int call_cntr;
208 int max_calls;
209 int i = 0;
210 int x = 0;
211 int y = 0;
212 int z = 0;
213
214 int16 typlen;
215 bool typbyval;
216 char typalign;
217
218 rtpg_dumpvalues_arg arg1 = NULL;
219 rtpg_dumpvalues_arg arg2 = NULL;
220
221 /* stuff done only on the first call of the function */
222 if (SRF_IS_FIRSTCALL()) {
223 MemoryContext oldcontext;
224 rt_pgraster *pgraster = NULL;
225 rt_raster raster = NULL;
226 rt_band band = NULL;
227 int numbands = 0;
228 int j = 0;
229 bool exclude_nodata_value = TRUE;
230
231 ArrayType *array;
232 Oid etype;
233 Datum *e;
234 bool *nulls;
235
236 double val = 0;
237 int isnodata = 0;
238
239 POSTGIS_RT_DEBUG(2, "RASTER_dumpValues first call");
240
241 /* create a function context for cross-call persistence */
242 funcctx = SRF_FIRSTCALL_INIT();
243
244 /* switch to memory context appropriate for multiple function calls */
245 oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
246
247 /* Get input arguments */
248 if (PG_ARGISNULL(0)) {
249 MemoryContextSwitchTo(oldcontext);
250 SRF_RETURN_DONE(funcctx);
251 }
252 pgraster = (rt_pgraster *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
253
254 raster = rt_raster_deserialize(pgraster, FALSE);
255 if (!raster) {
256 PG_FREE_IF_COPY(pgraster, 0);
257 ereport(ERROR, (
258 errcode(ERRCODE_OUT_OF_MEMORY),
259 errmsg("Could not deserialize raster")
260 ));
261 MemoryContextSwitchTo(oldcontext);
262 SRF_RETURN_DONE(funcctx);
263 }
264
265 /* check that raster is not empty */
266 /*
267 if (rt_raster_is_empty(raster)) {
268 elog(NOTICE, "Raster provided is empty");
269 rt_raster_destroy(raster);
270 PG_FREE_IF_COPY(pgraster, 0);
271 MemoryContextSwitchTo(oldcontext);
272 SRF_RETURN_DONE(funcctx);
273 }
274 */
275
276 /* raster has bands */
277 numbands = rt_raster_get_num_bands(raster);
278 if (!numbands) {
279 elog(NOTICE, "Raster provided has no bands");
280 rt_raster_destroy(raster);
281 PG_FREE_IF_COPY(pgraster, 0);
282 MemoryContextSwitchTo(oldcontext);
283 SRF_RETURN_DONE(funcctx);
284 }
285
286 /* initialize arg1 */
287 arg1 = rtpg_dumpvalues_arg_init();
288 if (arg1 == NULL) {
289 rt_raster_destroy(raster);
290 PG_FREE_IF_COPY(pgraster, 0);
291 MemoryContextSwitchTo(oldcontext);
292 elog(ERROR, "RASTER_dumpValues: Could not initialize argument structure");
293 SRF_RETURN_DONE(funcctx);
294 }
295
296 /* nband, array */
297 if (!PG_ARGISNULL(1)) {
298 array = PG_GETARG_ARRAYTYPE_P(1);
299 etype = ARR_ELEMTYPE(array);
300 get_typlenbyvalalign(etype, &typlen, &typbyval, &typalign);
301
302 switch (etype) {
303 case INT2OID:
304 case INT4OID:
305 break;
306 default:
307 rtpg_dumpvalues_arg_destroy(arg1);
308 rt_raster_destroy(raster);
309 PG_FREE_IF_COPY(pgraster, 0);
310 MemoryContextSwitchTo(oldcontext);
311 elog(ERROR, "RASTER_dumpValues: Invalid data type for band indexes");
312 SRF_RETURN_DONE(funcctx);
313 break;
314 }
315
316 deconstruct_array(array, etype, typlen, typbyval, typalign, &e, &nulls, &(arg1->numbands));
317
318 arg1->nbands = palloc(sizeof(int) * arg1->numbands);
319 if (arg1->nbands == NULL) {
320 rtpg_dumpvalues_arg_destroy(arg1);
321 rt_raster_destroy(raster);
322 PG_FREE_IF_COPY(pgraster, 0);
323 MemoryContextSwitchTo(oldcontext);
324 elog(ERROR, "RASTER_dumpValues: Could not allocate memory for band indexes");
325 SRF_RETURN_DONE(funcctx);
326 }
327
328 for (i = 0, j = 0; i < arg1->numbands; i++) {
329 if (nulls[i]) continue;
330
331 switch (etype) {
332 case INT2OID:
333 arg1->nbands[j] = DatumGetInt16(e[i]) - 1;
334 break;
335 case INT4OID:
336 arg1->nbands[j] = DatumGetInt32(e[i]) - 1;
337 break;
338 }
339
340 j++;
341 }
342
343 if (j < arg1->numbands) {
344 arg1->nbands = repalloc(arg1->nbands, sizeof(int) * j);
345 if (arg1->nbands == NULL) {
346 rtpg_dumpvalues_arg_destroy(arg1);
347 rt_raster_destroy(raster);
348 PG_FREE_IF_COPY(pgraster, 0);
349 MemoryContextSwitchTo(oldcontext);
350 elog(ERROR, "RASTER_dumpValues: Could not reallocate memory for band indexes");
351 SRF_RETURN_DONE(funcctx);
352 }
353
354 arg1->numbands = j;
355 }
356
357 /* validate nbands */
358 for (i = 0; i < arg1->numbands; i++) {
359 if (!rt_raster_has_band(raster, arg1->nbands[i])) {
360 elog(NOTICE, "Band at index %d not found in raster", arg1->nbands[i] + 1);
361 rtpg_dumpvalues_arg_destroy(arg1);
362 rt_raster_destroy(raster);
363 PG_FREE_IF_COPY(pgraster, 0);
364 MemoryContextSwitchTo(oldcontext);
365 SRF_RETURN_DONE(funcctx);
366 }
367 }
368
369 }
370 /* no bands specified, return all bands */
371 else {
372 arg1->numbands = numbands;
373 arg1->nbands = palloc(sizeof(int) * arg1->numbands);
374
375 if (arg1->nbands == NULL) {
376 rtpg_dumpvalues_arg_destroy(arg1);
377 rt_raster_destroy(raster);
378 PG_FREE_IF_COPY(pgraster, 0);
379 MemoryContextSwitchTo(oldcontext);
380 elog(ERROR, "RASTER_dumpValues: Could not allocate memory for band indexes");
381 SRF_RETURN_DONE(funcctx);
382 }
383
384 for (i = 0; i < arg1->numbands; i++) {
385 arg1->nbands[i] = i;
386 POSTGIS_RT_DEBUGF(4, "arg1->nbands[%d] = %d", arg1->nbands[i], i);
387 }
388 }
389
390 arg1->rows = rt_raster_get_height(raster);
391 arg1->columns = rt_raster_get_width(raster);
392
393 /* exclude_nodata_value */
394 if (!PG_ARGISNULL(2))
395 exclude_nodata_value = PG_GETARG_BOOL(2);
396 POSTGIS_RT_DEBUGF(4, "exclude_nodata_value = %d", exclude_nodata_value);
397
398 /* allocate memory for each band's values and nodata flags */
399 arg1->values = palloc(sizeof(Datum *) * arg1->numbands);
400 arg1->nodata = palloc(sizeof(bool *) * arg1->numbands);
401 if (arg1->values == NULL || arg1->nodata == NULL) {
402 rtpg_dumpvalues_arg_destroy(arg1);
403 rt_raster_destroy(raster);
404 PG_FREE_IF_COPY(pgraster, 0);
405 MemoryContextSwitchTo(oldcontext);
406 elog(ERROR, "RASTER_dumpValues: Could not allocate memory for pixel values");
407 SRF_RETURN_DONE(funcctx);
408 }
409 memset(arg1->values, 0, sizeof(Datum *) * arg1->numbands);
410 memset(arg1->nodata, 0, sizeof(bool *) * arg1->numbands);
411
412 /* get each band and dump data */
413 for (z = 0; z < arg1->numbands; z++) {
414 /* shortcut if raster is empty */
415 if (rt_raster_is_empty(raster))
416 break;
417
418 band = rt_raster_get_band(raster, arg1->nbands[z]);
419 if (!band) {
420 int nband = arg1->nbands[z] + 1;
421 rtpg_dumpvalues_arg_destroy(arg1);
422 rt_raster_destroy(raster);
423 PG_FREE_IF_COPY(pgraster, 0);
424 MemoryContextSwitchTo(oldcontext);
425 elog(ERROR, "RASTER_dumpValues: Could not get band at index %d", nband);
426 SRF_RETURN_DONE(funcctx);
427 }
428
429 /* allocate memory for values and nodata flags */
430 arg1->values[z] = palloc(sizeof(Datum) * arg1->rows * arg1->columns);
431 arg1->nodata[z] = palloc(sizeof(bool) * arg1->rows * arg1->columns);
432 if (arg1->values[z] == NULL || arg1->nodata[z] == NULL) {
433 rtpg_dumpvalues_arg_destroy(arg1);
434 rt_raster_destroy(raster);
435 PG_FREE_IF_COPY(pgraster, 0);
436 MemoryContextSwitchTo(oldcontext);
437 elog(ERROR, "RASTER_dumpValues: Could not allocate memory for pixel values");
438 SRF_RETURN_DONE(funcctx);
439 }
440 memset(arg1->values[z], 0, sizeof(Datum) * arg1->rows * arg1->columns);
441 memset(arg1->nodata[z], 0, sizeof(bool) * arg1->rows * arg1->columns);
442
443 i = 0;
444
445 /* shortcut if band is NODATA */
446 if (rt_band_get_isnodata_flag(band)) {
447 for (i = (arg1->rows * arg1->columns) - 1; i >= 0; i--)
448 arg1->nodata[z][i] = TRUE;
449 continue;
450 }
451
452 for (y = 0; y < arg1->rows; y++) {
453 for (x = 0; x < arg1->columns; x++) {
454 /* get pixel */
455 if (rt_band_get_pixel(band, x, y, &val, &isnodata) != ES_NONE) {
456 int nband = arg1->nbands[z] + 1;
457 rtpg_dumpvalues_arg_destroy(arg1);
458 rt_raster_destroy(raster);
459 PG_FREE_IF_COPY(pgraster, 0);
460 MemoryContextSwitchTo(oldcontext);
461 elog(ERROR, "RASTER_dumpValues: Could not pixel (%d, %d) of band %d", x, y, nband);
462 SRF_RETURN_DONE(funcctx);
463 }
464
465 arg1->values[z][i] = Float8GetDatum(val);
466 POSTGIS_RT_DEBUGF(5, "arg1->values[z][i] = %f", DatumGetFloat8(arg1->values[z][i]));
467 POSTGIS_RT_DEBUGF(5, "clamped is?: %d", rt_band_clamped_value_is_nodata(band, val));
468
469 if (exclude_nodata_value && isnodata) {
470 arg1->nodata[z][i] = TRUE;
471 POSTGIS_RT_DEBUG(5, "nodata = 1");
472 }
473 else
474 POSTGIS_RT_DEBUG(5, "nodata = 0");
475
476 i++;
477 }
478 }
479 }
480
481 /* cleanup */
482 rt_raster_destroy(raster);
483 PG_FREE_IF_COPY(pgraster, 0);
484
485 /* Store needed information */
486 funcctx->user_fctx = arg1;
487
488 /* total number of tuples to be returned */
489 funcctx->max_calls = arg1->numbands;
490
491 /* Build a tuple descriptor for our result type */
492 if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE) {
493 MemoryContextSwitchTo(oldcontext);
494 ereport(ERROR, (
495 errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
496 errmsg(
497 "function returning record called in context "
498 "that cannot accept type record"
499 )
500 ));
501 }
502
503 BlessTupleDesc(tupdesc);
504 funcctx->tuple_desc = tupdesc;
505
506 MemoryContextSwitchTo(oldcontext);
507 }
508
509 /* stuff done on every call of the function */
510 funcctx = SRF_PERCALL_SETUP();
511
512 call_cntr = funcctx->call_cntr;
513 max_calls = funcctx->max_calls;
514 tupdesc = funcctx->tuple_desc;
515 arg2 = funcctx->user_fctx;
516
517 /* do when there is more left to send */
518 if (call_cntr < max_calls) {
519 Datum values[VALUES_LENGTH];
520 bool nulls[VALUES_LENGTH];
521 HeapTuple tuple;
522 Datum result;
523 ArrayType *mdValues = NULL;
524 int ndim = 2;
525 int dim[2] = {arg2->rows, arg2->columns};
526 int lbound[2] = {1, 1};
527
528 POSTGIS_RT_DEBUGF(3, "call number %d", call_cntr);
529 POSTGIS_RT_DEBUGF(4, "dim = %d, %d", dim[0], dim[1]);
530
531 memset(nulls, FALSE, sizeof(bool) * VALUES_LENGTH);
532
533 values[0] = Int32GetDatum(arg2->nbands[call_cntr] + 1);
534
535 /* info about the type of item in the multi-dimensional array (float8). */
536 get_typlenbyvalalign(FLOAT8OID, &typlen, &typbyval, &typalign);
537
538 /* if values is NULL, return empty array */
539 if (arg2->values[call_cntr] == NULL)
540 ndim = 0;
541
542 /* assemble 3-dimension array of values */
543 mdValues = construct_md_array(
544 arg2->values[call_cntr], arg2->nodata[call_cntr],
545 ndim, dim, lbound,
546 FLOAT8OID,
547 typlen, typbyval, typalign
548 );
549 values[1] = PointerGetDatum(mdValues);
550
551 /* build a tuple and datum */
552 tuple = heap_form_tuple(tupdesc, values, nulls);
553 result = HeapTupleGetDatum(tuple);
554
555 SRF_RETURN_NEXT(funcctx, result);
556 }
557 /* do when there is no more left */
558 else {
559 rtpg_dumpvalues_arg_destroy(arg2);
560 SRF_RETURN_DONE(funcctx);
561 }
562 }
563
564 /**
565 * Write value of raster sample on given position and in specified band.
566 */
567 PG_FUNCTION_INFO_V1(RASTER_setPixelValue);
RASTER_setPixelValue(PG_FUNCTION_ARGS)568 Datum RASTER_setPixelValue(PG_FUNCTION_ARGS)
569 {
570 rt_pgraster *pgraster = NULL;
571 rt_pgraster *pgrtn = NULL;
572 rt_raster raster = NULL;
573 rt_band band = NULL;
574 double pixvalue = 0;
575 int32_t bandindex = 0;
576 int32_t x = 0;
577 int32_t y = 0;
578 bool skipset = FALSE;
579
580 if (PG_ARGISNULL(0))
581 PG_RETURN_NULL();
582
583 /* Check index is not NULL or < 1 */
584 if (PG_ARGISNULL(1))
585 bandindex = -1;
586 else
587 bandindex = PG_GETARG_INT32(1);
588
589 if (bandindex < 1) {
590 elog(NOTICE, "Invalid band index (must use 1-based). Value not set. Returning original raster");
591 skipset = TRUE;
592 }
593
594 /* Validate pixel coordinates are not null */
595 if (PG_ARGISNULL(2)) {
596 elog(NOTICE, "X coordinate can not be NULL when setting pixel value. Value not set. Returning original raster");
597 skipset = TRUE;
598 }
599 else
600 x = PG_GETARG_INT32(2);
601
602 if (PG_ARGISNULL(3)) {
603 elog(NOTICE, "Y coordinate can not be NULL when setting pixel value. Value not set. Returning original raster");
604 skipset = TRUE;
605 }
606 else
607 y = PG_GETARG_INT32(3);
608
609 POSTGIS_RT_DEBUGF(3, "Pixel coordinates (%d, %d)", x, y);
610
611 /* Deserialize raster */
612 pgraster = (rt_pgraster *) PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0));
613
614 raster = rt_raster_deserialize(pgraster, FALSE);
615 if (!raster) {
616 PG_FREE_IF_COPY(pgraster, 0);
617 elog(ERROR, "RASTER_setPixelValue: Could not deserialize raster");
618 PG_RETURN_NULL();
619 }
620
621 if (!skipset) {
622 /* Fetch requested band */
623 band = rt_raster_get_band(raster, bandindex - 1);
624 if (!band) {
625 elog(NOTICE, "Could not find raster band of index %d when setting "
626 "pixel value. Value not set. Returning original raster",
627 bandindex);
628 PG_RETURN_POINTER(pgraster);
629 }
630 else {
631 /* Set the pixel value */
632 if (PG_ARGISNULL(4)) {
633 if (!rt_band_get_hasnodata_flag(band)) {
634 elog(NOTICE, "Raster do not have a nodata value defined. "
635 "Set band nodata value first. Nodata value not set. "
636 "Returning original raster");
637 PG_RETURN_POINTER(pgraster);
638 }
639 else {
640 rt_band_get_nodata(band, &pixvalue);
641 rt_band_set_pixel(band, x - 1, y - 1, pixvalue, NULL);
642 }
643 }
644 else {
645 pixvalue = PG_GETARG_FLOAT8(4);
646 rt_band_set_pixel(band, x - 1, y - 1, pixvalue, NULL);
647 }
648 }
649 }
650
651 pgrtn = rt_raster_serialize(raster);
652 rt_raster_destroy(raster);
653 PG_FREE_IF_COPY(pgraster, 0);
654 if (!pgrtn)
655 PG_RETURN_NULL();
656
657 SET_VARSIZE(pgrtn, pgrtn->size);
658 PG_RETURN_POINTER(pgrtn);
659 }
660
661 /**
662 * Set pixels to value from array
663 */
664 PG_FUNCTION_INFO_V1(RASTER_setPixelValuesArray);
RASTER_setPixelValuesArray(PG_FUNCTION_ARGS)665 Datum RASTER_setPixelValuesArray(PG_FUNCTION_ARGS)
666 {
667 rt_pgraster *pgraster = NULL;
668 rt_pgraster *pgrtn = NULL;
669 rt_raster raster = NULL;
670 rt_band band = NULL;
671 int numbands = 0;
672
673 int nband = 0;
674 int width = 0;
675 int height = 0;
676
677 ArrayType *array;
678 Oid etype;
679 Datum *elements;
680 bool *nulls;
681 int16 typlen;
682 bool typbyval;
683 char typalign;
684 int ndims = 1;
685 int *dims;
686 int num = 0;
687
688 int ul[2] = {0};
689 struct pixelvalue {
690 int x;
691 int y;
692
693 bool noset;
694 bool nodata;
695 double value;
696 };
697 struct pixelvalue *pixval = NULL;
698 int numpixval = 0;
699 int dimpixval[2] = {1, 1};
700 int dimnoset[2] = {1, 1};
701 int hasnodata = FALSE;
702 double nodataval = 0;
703 bool keepnodata = FALSE;
704 bool hasnosetval = FALSE;
705 bool nosetvalisnull = FALSE;
706 double nosetval = 0;
707
708 int rtn = 0;
709 double val = 0;
710 int isnodata = 0;
711
712 int i = 0;
713 int j = 0;
714 int x = 0;
715 int y = 0;
716
717 /* pgraster is null, return null */
718 if (PG_ARGISNULL(0))
719 PG_RETURN_NULL();
720 pgraster = (rt_pgraster *) PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0));
721
722 /* raster */
723 raster = rt_raster_deserialize(pgraster, FALSE);
724 if (!raster) {
725 PG_FREE_IF_COPY(pgraster, 0);
726 elog(ERROR, "RASTER_setPixelValuesArray: Could not deserialize raster");
727 PG_RETURN_NULL();
728 }
729
730 /* raster attributes */
731 numbands = rt_raster_get_num_bands(raster);
732 width = rt_raster_get_width(raster);
733 height = rt_raster_get_height(raster);
734
735 /* nband */
736 if (PG_ARGISNULL(1)) {
737 elog(NOTICE, "Band index cannot be NULL. Value must be 1-based. Returning original raster");
738 rt_raster_destroy(raster);
739 PG_RETURN_POINTER(pgraster);
740 }
741
742 nband = PG_GETARG_INT32(1);
743 if (nband < 1 || nband > numbands) {
744 elog(NOTICE, "Band index is invalid. Value must be 1-based. Returning original raster");
745 rt_raster_destroy(raster);
746 PG_RETURN_POINTER(pgraster);
747 }
748
749 /* x, y */
750 for (i = 2, j = 0; i < 4; i++, j++) {
751 if (PG_ARGISNULL(i)) {
752 elog(NOTICE, "%s cannot be NULL. Value must be 1-based. Returning original raster", j < 1 ? "X" : "Y");
753 rt_raster_destroy(raster);
754 PG_RETURN_POINTER(pgraster);
755 }
756
757 ul[j] = PG_GETARG_INT32(i);
758 if (
759 (ul[j] < 1) || (
760 (j < 1 && ul[j] > width) ||
761 (j > 0 && ul[j] > height)
762 )
763 ) {
764 elog(NOTICE, "%s is invalid. Value must be 1-based. Returning original raster", j < 1 ? "X" : "Y");
765 rt_raster_destroy(raster);
766 PG_RETURN_POINTER(pgraster);
767 }
768
769 /* force 0-based from 1-based */
770 ul[j] -= 1;
771 }
772
773 /* new value set */
774 if (PG_ARGISNULL(4)) {
775 elog(NOTICE, "No values to set. Returning original raster");
776 rt_raster_destroy(raster);
777 PG_RETURN_POINTER(pgraster);
778 }
779
780 array = PG_GETARG_ARRAYTYPE_P(4);
781 etype = ARR_ELEMTYPE(array);
782 get_typlenbyvalalign(etype, &typlen, &typbyval, &typalign);
783
784 switch (etype) {
785 case FLOAT4OID:
786 case FLOAT8OID:
787 break;
788 default:
789 rt_raster_destroy(raster);
790 PG_FREE_IF_COPY(pgraster, 0);
791 elog(ERROR, "RASTER_setPixelValuesArray: Invalid data type for new values");
792 PG_RETURN_NULL();
793 break;
794 }
795
796 ndims = ARR_NDIM(array);
797 dims = ARR_DIMS(array);
798 POSTGIS_RT_DEBUGF(4, "ndims = %d", ndims);
799
800 if (ndims < 1 || ndims > 2) {
801 elog(NOTICE, "New values array must be of 1 or 2 dimensions. Returning original raster");
802 rt_raster_destroy(raster);
803 PG_RETURN_POINTER(pgraster);
804 }
805 /* outer element, then inner element */
806 /* i = 0, y */
807 /* i = 1, x */
808 if (ndims != 2)
809 dimpixval[1] = dims[0];
810 else {
811 dimpixval[0] = dims[0];
812 dimpixval[1] = dims[1];
813 }
814 POSTGIS_RT_DEBUGF(4, "dimpixval = (%d, %d)", dimpixval[0], dimpixval[1]);
815
816 deconstruct_array(
817 array,
818 etype,
819 typlen, typbyval, typalign,
820 &elements, &nulls, &num
821 );
822
823 /* # of elements doesn't match dims */
824 if (num < 1 || num != (dimpixval[0] * dimpixval[1])) {
825 if (num) {
826 pfree(elements);
827 pfree(nulls);
828 }
829 rt_raster_destroy(raster);
830 PG_FREE_IF_COPY(pgraster, 0);
831 elog(ERROR, "RASTER_setPixelValuesArray: Could not deconstruct new values array");
832 PG_RETURN_NULL();
833 }
834
835 /* allocate memory for pixval */
836 numpixval = num;
837 pixval = palloc(sizeof(struct pixelvalue) * numpixval);
838 if (pixval == NULL) {
839 pfree(elements);
840 pfree(nulls);
841 rt_raster_destroy(raster);
842 PG_FREE_IF_COPY(pgraster, 0);
843 elog(ERROR, "RASTER_setPixelValuesArray: Could not allocate memory for new pixel values");
844 PG_RETURN_NULL();
845 }
846
847 /* load new values into pixval */
848 i = 0;
849 for (y = 0; y < dimpixval[0]; y++) {
850 for (x = 0; x < dimpixval[1]; x++) {
851 /* 0-based */
852 pixval[i].x = ul[0] + x;
853 pixval[i].y = ul[1] + y;
854
855 pixval[i].noset = FALSE;
856 pixval[i].nodata = FALSE;
857 pixval[i].value = 0;
858
859 if (nulls[i])
860 pixval[i].nodata = TRUE;
861 else {
862 switch (etype) {
863 case FLOAT4OID:
864 pixval[i].value = DatumGetFloat4(elements[i]);
865 break;
866 case FLOAT8OID:
867 pixval[i].value = DatumGetFloat8(elements[i]);
868 break;
869 }
870 }
871
872 i++;
873 }
874 }
875
876 pfree(elements);
877 pfree(nulls);
878
879 /* now load noset flags */
880 if (!PG_ARGISNULL(5)) {
881 array = PG_GETARG_ARRAYTYPE_P(5);
882 etype = ARR_ELEMTYPE(array);
883 get_typlenbyvalalign(etype, &typlen, &typbyval, &typalign);
884
885 switch (etype) {
886 case BOOLOID:
887 break;
888 default:
889 pfree(pixval);
890 rt_raster_destroy(raster);
891 PG_FREE_IF_COPY(pgraster, 0);
892 elog(ERROR, "RASTER_setPixelValuesArray: Invalid data type for noset flags");
893 PG_RETURN_NULL();
894 break;
895 }
896
897 ndims = ARR_NDIM(array);
898 dims = ARR_DIMS(array);
899 POSTGIS_RT_DEBUGF(4, "ndims = %d", ndims);
900
901 if (ndims < 1 || ndims > 2) {
902 elog(NOTICE, "Noset flags array must be of 1 or 2 dimensions. Returning original raster");
903 pfree(pixval);
904 rt_raster_destroy(raster);
905 PG_RETURN_POINTER(pgraster);
906 }
907 /* outer element, then inner element */
908 /* i = 0, y */
909 /* i = 1, x */
910 if (ndims != 2)
911 dimnoset[1] = dims[0];
912 else {
913 dimnoset[0] = dims[0];
914 dimnoset[1] = dims[1];
915 }
916 POSTGIS_RT_DEBUGF(4, "dimnoset = (%d, %d)", dimnoset[0], dimnoset[1]);
917
918 deconstruct_array(
919 array,
920 etype,
921 typlen, typbyval, typalign,
922 &elements, &nulls, &num
923 );
924
925 /* # of elements doesn't match dims */
926 if (num < 1 || num != (dimnoset[0] * dimnoset[1])) {
927 pfree(pixval);
928 if (num) {
929 pfree(elements);
930 pfree(nulls);
931 }
932 rt_raster_destroy(raster);
933 PG_FREE_IF_COPY(pgraster, 0);
934 elog(ERROR, "RASTER_setPixelValuesArray: Could not deconstruct noset flags array");
935 PG_RETURN_NULL();
936 }
937
938 i = 0;
939 j = 0;
940 for (y = 0; y < dimnoset[0]; y++) {
941 if (y >= dimpixval[0]) break;
942
943 for (x = 0; x < dimnoset[1]; x++) {
944 /* fast forward noset elements */
945 if (x >= dimpixval[1]) {
946 i += (dimnoset[1] - dimpixval[1]);
947 break;
948 }
949
950 if (!nulls[i] && DatumGetBool(elements[i]))
951 pixval[j].noset = TRUE;
952
953 i++;
954 j++;
955 }
956
957 /* fast forward pixval */
958 if (x < dimpixval[1])
959 j += (dimpixval[1] - dimnoset[1]);
960 }
961
962 pfree(elements);
963 pfree(nulls);
964 }
965 /* hasnosetvalue and nosetvalue */
966 else if (!PG_ARGISNULL(6) && PG_GETARG_BOOL(6)) {
967 hasnosetval = TRUE;
968 if (PG_ARGISNULL(7))
969 nosetvalisnull = TRUE;
970 else
971 nosetval = PG_GETARG_FLOAT8(7);
972 }
973
974 #if POSTGIS_DEBUG_LEVEL > 0
975 for (i = 0; i < numpixval; i++) {
976 POSTGIS_RT_DEBUGF(4, "pixval[%d](x, y, noset, nodata, value) = (%d, %d, %d, %d, %f)",
977 i,
978 pixval[i].x,
979 pixval[i].y,
980 pixval[i].noset,
981 pixval[i].nodata,
982 pixval[i].value
983 );
984 }
985 #endif
986
987 /* keepnodata flag */
988 if (!PG_ARGISNULL(8))
989 keepnodata = PG_GETARG_BOOL(8);
990
991 /* get band */
992 band = rt_raster_get_band(raster, nband - 1);
993 if (!band) {
994 elog(NOTICE, "Could not find band at index %d. Returning original raster", nband);
995 pfree(pixval);
996 rt_raster_destroy(raster);
997 PG_RETURN_POINTER(pgraster);
998 }
999
1000 /* get band nodata info */
1001 /* has NODATA, use NODATA */
1002 hasnodata = rt_band_get_hasnodata_flag(band);
1003 if (hasnodata)
1004 rt_band_get_nodata(band, &nodataval);
1005 /* no NODATA, use min possible value */
1006 else
1007 nodataval = rt_band_get_min_value(band);
1008
1009 /* set pixels */
1010 for (i = 0; i < numpixval; i++) {
1011 /* noset = true, skip */
1012 if (pixval[i].noset)
1013 continue;
1014 /* check against nosetval */
1015 else if (hasnosetval) {
1016 /* pixel = NULL AND nosetval = NULL */
1017 if (pixval[i].nodata && nosetvalisnull)
1018 continue;
1019 /* pixel value = nosetval */
1020 else if (!pixval[i].nodata && !nosetvalisnull && FLT_EQ(pixval[i].value, nosetval))
1021 continue;
1022 }
1023
1024 /* if pixel is outside bounds, skip */
1025 if (
1026 (pixval[i].x < 0 || pixval[i].x >= width) ||
1027 (pixval[i].y < 0 || pixval[i].y >= height)
1028 ) {
1029 elog(NOTICE, "Cannot set value for pixel (%d, %d) outside raster bounds: %d x %d",
1030 pixval[i].x + 1, pixval[i].y + 1,
1031 width, height
1032 );
1033 continue;
1034 }
1035
1036 /* if hasnodata = TRUE and keepnodata = TRUE, inspect pixel value */
1037 if (hasnodata && keepnodata) {
1038 rtn = rt_band_get_pixel(band, pixval[i].x, pixval[i].y, &val, &isnodata);
1039 if (rtn != ES_NONE) {
1040 pfree(pixval);
1041 rt_raster_destroy(raster);
1042 PG_FREE_IF_COPY(pgraster, 0);
1043 elog(ERROR, "Cannot get value of pixel");
1044 PG_RETURN_NULL();
1045 }
1046
1047 /* pixel value = NODATA, skip */
1048 if (isnodata) {
1049 continue;
1050 }
1051 }
1052
1053 if (pixval[i].nodata)
1054 rt_band_set_pixel(band, pixval[i].x, pixval[i].y, nodataval, NULL);
1055 else
1056 rt_band_set_pixel(band, pixval[i].x, pixval[i].y, pixval[i].value, NULL);
1057 }
1058
1059 pfree(pixval);
1060
1061 /* serialize new raster */
1062 pgrtn = rt_raster_serialize(raster);
1063 rt_raster_destroy(raster);
1064 PG_FREE_IF_COPY(pgraster, 0);
1065 if (!pgrtn)
1066 PG_RETURN_NULL();
1067
1068 SET_VARSIZE(pgrtn, pgrtn->size);
1069 PG_RETURN_POINTER(pgrtn);
1070 }
1071
1072 /* ---------------------------------------------------------------- */
1073 /* ST_SetValues using geomval array */
1074 /* ---------------------------------------------------------------- */
1075
1076 typedef struct rtpg_setvaluesgv_arg_t *rtpg_setvaluesgv_arg;
1077 typedef struct rtpg_setvaluesgv_geomval_t *rtpg_setvaluesgv_geomval;
1078
1079 struct rtpg_setvaluesgv_arg_t {
1080 int ngv;
1081 rtpg_setvaluesgv_geomval gv;
1082
1083 bool keepnodata;
1084 };
1085
1086 struct rtpg_setvaluesgv_geomval_t {
1087 struct {
1088 int nodata;
1089 double value;
1090 } pixval;
1091
1092 LWGEOM *geom;
1093 rt_raster mask;
1094 };
1095
rtpg_setvaluesgv_arg_init()1096 static rtpg_setvaluesgv_arg rtpg_setvaluesgv_arg_init() {
1097 rtpg_setvaluesgv_arg arg = palloc(sizeof(struct rtpg_setvaluesgv_arg_t));
1098 if (arg == NULL) {
1099 elog(ERROR, "rtpg_setvaluesgv_arg_init: Could not allocate memory for function arguments");
1100 return NULL;
1101 }
1102
1103 arg->ngv = 0;
1104 arg->gv = NULL;
1105 arg->keepnodata = 0;
1106
1107 return arg;
1108 }
1109
rtpg_setvaluesgv_arg_destroy(rtpg_setvaluesgv_arg arg)1110 static void rtpg_setvaluesgv_arg_destroy(rtpg_setvaluesgv_arg arg) {
1111 int i = 0;
1112
1113 if (arg->gv != NULL) {
1114 for (i = 0; i < arg->ngv; i++) {
1115 if (arg->gv[i].geom != NULL)
1116 lwgeom_free(arg->gv[i].geom);
1117 if (arg->gv[i].mask != NULL)
1118 rt_raster_destroy(arg->gv[i].mask);
1119 }
1120
1121 pfree(arg->gv);
1122 }
1123
1124 pfree(arg);
1125 }
1126
rtpg_setvalues_geomval_callback(rt_iterator_arg arg,void * userarg,double * value,int * nodata)1127 static int rtpg_setvalues_geomval_callback(
1128 rt_iterator_arg arg, void *userarg,
1129 double *value, int *nodata
1130 ) {
1131 rtpg_setvaluesgv_arg funcarg = (rtpg_setvaluesgv_arg) userarg;
1132 int i = 0;
1133 int j = 0;
1134
1135 *value = 0;
1136 *nodata = 0;
1137
1138 POSTGIS_RT_DEBUGF(4, "keepnodata = %d", funcarg->keepnodata);
1139
1140 /* keepnodata = TRUE */
1141 if (funcarg->keepnodata && arg->nodata[0][0][0]) {
1142 POSTGIS_RT_DEBUG(3, "keepnodata = 1 AND source raster pixel is NODATA");
1143 *nodata = 1;
1144 return 1;
1145 }
1146
1147 for (i = arg->rasters - 1, j = funcarg->ngv - 1; i > 0; i--, j--) {
1148 POSTGIS_RT_DEBUGF(4, "checking raster %d", i);
1149
1150 /* mask is NODATA */
1151 if (arg->nodata[i][0][0])
1152 continue;
1153 /* mask is NOT NODATA */
1154 else {
1155 POSTGIS_RT_DEBUGF(4, "Using information from geometry %d", j);
1156
1157 if (funcarg->gv[j].pixval.nodata)
1158 *nodata = 1;
1159 else
1160 *value = funcarg->gv[j].pixval.value;
1161
1162 return 1;
1163 }
1164 }
1165
1166 POSTGIS_RT_DEBUG(4, "Using information from source raster");
1167
1168 /* still here */
1169 if (arg->nodata[0][0][0])
1170 *nodata = 1;
1171 else
1172 *value = arg->values[0][0][0];
1173
1174 return 1;
1175 }
1176
1177 PG_FUNCTION_INFO_V1(RASTER_setPixelValuesGeomval);
RASTER_setPixelValuesGeomval(PG_FUNCTION_ARGS)1178 Datum RASTER_setPixelValuesGeomval(PG_FUNCTION_ARGS)
1179 {
1180 rt_pgraster *pgraster = NULL;
1181 rt_pgraster *pgrtn = NULL;
1182 rt_raster raster = NULL;
1183 rt_band band = NULL;
1184 rt_raster _raster = NULL;
1185 rt_band _band = NULL;
1186 int nband = 0; /* 1-based */
1187
1188 int numbands = 0;
1189 int width = 0;
1190 int height = 0;
1191 int32_t srid = 0;
1192 double gt[6] = {0};
1193
1194 rt_pixtype pixtype = PT_END;
1195 int hasnodata = 0;
1196 double nodataval = 0;
1197
1198 rtpg_setvaluesgv_arg arg = NULL;
1199 int allpoint = 0;
1200
1201 ArrayType *array;
1202 Oid etype;
1203 Datum *e;
1204 bool *nulls;
1205 int16 typlen;
1206 bool typbyval;
1207 char typalign;
1208 int n = 0;
1209
1210 HeapTupleHeader tup;
1211 bool isnull;
1212 Datum tupv;
1213
1214 GSERIALIZED *gser = NULL;
1215 uint8_t gtype;
1216 lwvarlena_t *wkb = NULL;
1217
1218 int i = 0;
1219 uint32_t j = 0;
1220 int noerr = 1;
1221
1222 /* pgraster is null, return null */
1223 if (PG_ARGISNULL(0))
1224 PG_RETURN_NULL();
1225 pgraster = (rt_pgraster *) PG_DETOAST_DATUM_COPY(PG_GETARG_DATUM(0));
1226
1227 /* raster */
1228 raster = rt_raster_deserialize(pgraster, FALSE);
1229 if (!raster) {
1230 PG_FREE_IF_COPY(pgraster, 0);
1231 elog(ERROR, "RASTER_setPixelValuesGeomval: Could not deserialize raster");
1232 PG_RETURN_NULL();
1233 }
1234
1235 /* raster attributes */
1236 numbands = rt_raster_get_num_bands(raster);
1237 width = rt_raster_get_width(raster);
1238 height = rt_raster_get_height(raster);
1239 srid = clamp_srid(rt_raster_get_srid(raster));
1240 rt_raster_get_geotransform_matrix(raster, gt);
1241
1242 /* nband */
1243 if (PG_ARGISNULL(1)) {
1244 elog(NOTICE, "Band index cannot be NULL. Value must be 1-based. Returning original raster");
1245 rt_raster_destroy(raster);
1246 PG_RETURN_POINTER(pgraster);
1247 }
1248
1249 nband = PG_GETARG_INT32(1);
1250 if (nband < 1 || nband > numbands) {
1251 elog(NOTICE, "Band index is invalid. Value must be 1-based. Returning original raster");
1252 rt_raster_destroy(raster);
1253 PG_RETURN_POINTER(pgraster);
1254 }
1255
1256 /* get band attributes */
1257 band = rt_raster_get_band(raster, nband - 1);
1258 pixtype = rt_band_get_pixtype(band);
1259 hasnodata = rt_band_get_hasnodata_flag(band);
1260 if (hasnodata)
1261 rt_band_get_nodata(band, &nodataval);
1262
1263 /* array of geomval (2) */
1264 if (PG_ARGISNULL(2)) {
1265 elog(NOTICE, "No values to set. Returning original raster");
1266 rt_raster_destroy(raster);
1267 PG_RETURN_POINTER(pgraster);
1268 }
1269
1270 array = PG_GETARG_ARRAYTYPE_P(2);
1271 etype = ARR_ELEMTYPE(array);
1272 get_typlenbyvalalign(etype, &typlen, &typbyval, &typalign);
1273
1274 deconstruct_array(
1275 array,
1276 etype,
1277 typlen, typbyval, typalign,
1278 &e, &nulls, &n
1279 );
1280
1281 if (!n) {
1282 elog(NOTICE, "No values to set. Returning original raster");
1283 rt_raster_destroy(raster);
1284 PG_RETURN_POINTER(pgraster);
1285 }
1286
1287 /* init arg */
1288 arg = rtpg_setvaluesgv_arg_init();
1289 if (arg == NULL) {
1290 rt_raster_destroy(raster);
1291 PG_FREE_IF_COPY(pgraster, 0);
1292 elog(ERROR, "RASTER_setPixelValuesGeomval: Could not intialize argument structure");
1293 PG_RETURN_NULL();
1294 }
1295
1296 arg->gv = palloc(sizeof(struct rtpg_setvaluesgv_geomval_t) * n);
1297 if (arg->gv == NULL) {
1298 rtpg_setvaluesgv_arg_destroy(arg);
1299 rt_raster_destroy(raster);
1300 PG_FREE_IF_COPY(pgraster, 0);
1301 elog(ERROR, "RASTER_setPixelValuesGeomval: Could not allocate memory for geomval array");
1302 PG_RETURN_NULL();
1303 }
1304
1305 /* process each element */
1306 arg->ngv = 0;
1307 for (i = 0; i < n; i++) {
1308 if (nulls[i])
1309 continue;
1310
1311 arg->gv[arg->ngv].pixval.nodata = 0;
1312 arg->gv[arg->ngv].pixval.value = 0;
1313 arg->gv[arg->ngv].geom = NULL;
1314 arg->gv[arg->ngv].mask = NULL;
1315
1316 /* each element is a tuple */
1317 tup = (HeapTupleHeader) DatumGetPointer(e[i]);
1318 if (NULL == tup) {
1319 rtpg_setvaluesgv_arg_destroy(arg);
1320 rt_raster_destroy(raster);
1321 PG_FREE_IF_COPY(pgraster, 0);
1322 elog(ERROR, "RASTER_setPixelValuesGeomval: Invalid argument for geomval at index %d", i);
1323 PG_RETURN_NULL();
1324 }
1325
1326 /* first element, geometry */
1327 POSTGIS_RT_DEBUG(4, "Processing first element (geometry)");
1328 tupv = GetAttributeByName(tup, "geom", &isnull);
1329 if (isnull) {
1330 elog(NOTICE, "First argument (geom) of geomval at index %d is NULL. Skipping", i);
1331 continue;
1332 }
1333
1334 gser = (GSERIALIZED *) PG_DETOAST_DATUM(tupv);
1335 arg->gv[arg->ngv].geom = lwgeom_from_gserialized(gser);
1336 if (arg->gv[arg->ngv].geom == NULL) {
1337 rtpg_setvaluesgv_arg_destroy(arg);
1338 rt_raster_destroy(raster);
1339 PG_FREE_IF_COPY(pgraster, 0);
1340 elog(ERROR, "RASTER_setPixelValuesGeomval: Could not deserialize geometry of geomval at index %d", i);
1341 PG_RETURN_NULL();
1342 }
1343
1344 /* empty geometry */
1345 if (lwgeom_is_empty(arg->gv[arg->ngv].geom)) {
1346 elog(NOTICE, "First argument (geom) of geomval at index %d is an empty geometry. Skipping", i);
1347 continue;
1348 }
1349
1350 /* check SRID */
1351 if (clamp_srid(gserialized_get_srid(gser)) != srid) {
1352 elog(NOTICE, "Geometry provided for geomval at index %d does not have the same SRID as the raster: %d. Returning original raster", i, srid);
1353 rtpg_setvaluesgv_arg_destroy(arg);
1354 rt_raster_destroy(raster);
1355 PG_RETURN_POINTER(pgraster);
1356 }
1357
1358 /* Get a 2D version of the geometry if necessary */
1359 if (lwgeom_ndims(arg->gv[arg->ngv].geom) > 2) {
1360 LWGEOM *geom2d = lwgeom_force_2d(arg->gv[arg->ngv].geom);
1361 lwgeom_free(arg->gv[arg->ngv].geom);
1362 arg->gv[arg->ngv].geom = geom2d;
1363 }
1364
1365 /* filter for types */
1366 gtype = gserialized_get_type(gser);
1367
1368 /* shortcuts for POINT and MULTIPOINT */
1369 if (gtype == POINTTYPE || gtype == MULTIPOINTTYPE)
1370 allpoint++;
1371
1372 /* get wkb of geometry */
1373 POSTGIS_RT_DEBUG(3, "getting wkb of geometry");
1374 wkb = lwgeom_to_wkb_varlena(arg->gv[arg->ngv].geom, WKB_SFSQL);
1375
1376 /* rasterize geometry */
1377 arg->gv[arg->ngv].mask = rt_raster_gdal_rasterize((unsigned char *)wkb->data,
1378 LWSIZE_GET(wkb->size) - LWVARHDRSZ,
1379 NULL,
1380 0,
1381 NULL,
1382 NULL,
1383 NULL,
1384 NULL,
1385 NULL,
1386 NULL,
1387 NULL,
1388 &(gt[1]),
1389 &(gt[5]),
1390 NULL,
1391 NULL,
1392 &(gt[0]),
1393 &(gt[3]),
1394 &(gt[2]),
1395 &(gt[4]),
1396 NULL);
1397
1398 pfree(wkb);
1399 if (gtype != POINTTYPE && gtype != MULTIPOINTTYPE) {
1400 lwgeom_free(arg->gv[arg->ngv].geom);
1401 arg->gv[arg->ngv].geom = NULL;
1402 }
1403
1404 if (arg->gv[arg->ngv].mask == NULL) {
1405 rtpg_setvaluesgv_arg_destroy(arg);
1406 rt_raster_destroy(raster);
1407 PG_FREE_IF_COPY(pgraster, 0);
1408 elog(ERROR, "RASTER_setPixelValuesGeomval: Could not rasterize geometry of geomval at index %d", i);
1409 PG_RETURN_NULL();
1410 }
1411
1412 /* set SRID */
1413 rt_raster_set_srid(arg->gv[arg->ngv].mask, srid);
1414
1415 /* second element, value */
1416 POSTGIS_RT_DEBUG(4, "Processing second element (val)");
1417 tupv = GetAttributeByName(tup, "val", &isnull);
1418 if (isnull) {
1419 elog(NOTICE, "Second argument (val) of geomval at index %d is NULL. Treating as NODATA", i);
1420 arg->gv[arg->ngv].pixval.nodata = 1;
1421 }
1422 else
1423 arg->gv[arg->ngv].pixval.value = DatumGetFloat8(tupv);
1424
1425 (arg->ngv)++;
1426 }
1427
1428 /* redim arg->gv if needed */
1429 if (arg->ngv < n) {
1430 arg->gv = repalloc(arg->gv, sizeof(struct rtpg_setvaluesgv_geomval_t) * arg->ngv);
1431 if (arg->gv == NULL) {
1432 rtpg_setvaluesgv_arg_destroy(arg);
1433 rt_raster_destroy(raster);
1434 PG_FREE_IF_COPY(pgraster, 0);
1435 elog(ERROR, "RASTER_setPixelValuesGeomval: Could not reallocate memory for geomval array");
1436 PG_RETURN_NULL();
1437 }
1438 }
1439
1440 /* keepnodata */
1441 if (!PG_ARGISNULL(3))
1442 arg->keepnodata = PG_GETARG_BOOL(3);
1443 POSTGIS_RT_DEBUGF(3, "keepnodata = %d", arg->keepnodata);
1444
1445 /* keepnodata = TRUE and band is NODATA */
1446 if (arg->keepnodata && rt_band_get_isnodata_flag(band)) {
1447 POSTGIS_RT_DEBUG(3, "keepnodata = TRUE and band is NODATA. Not doing anything");
1448 }
1449 /* all elements are points */
1450 else if (allpoint == arg->ngv) {
1451 double igt[6] = {0};
1452 double xy[2] = {0};
1453 double value = 0;
1454 int isnodata = 0;
1455
1456 LWCOLLECTION *coll = NULL;
1457 LWPOINT *point = NULL;
1458 POINT2D p;
1459
1460 POSTGIS_RT_DEBUG(3, "all geometries are points, using direct to pixel method");
1461
1462 /* cache inverse gretransform matrix */
1463 rt_raster_get_inverse_geotransform_matrix(NULL, gt, igt);
1464
1465 /* process each geometry */
1466 for (i = 0; i < arg->ngv; i++) {
1467 /* convert geometry to collection */
1468 coll = lwgeom_as_lwcollection(lwgeom_as_multi(arg->gv[i].geom));
1469
1470 /* process each point in collection */
1471 for (j = 0; j < coll->ngeoms; j++) {
1472 point = lwgeom_as_lwpoint(coll->geoms[j]);
1473 getPoint2d_p(point->point, 0, &p);
1474
1475 if (rt_raster_geopoint_to_cell(raster, p.x, p.y, &(xy[0]), &(xy[1]), igt) != ES_NONE) {
1476 rtpg_setvaluesgv_arg_destroy(arg);
1477 rt_raster_destroy(raster);
1478 PG_FREE_IF_COPY(pgraster, 0);
1479 elog(ERROR, "RASTER_setPixelValuesGeomval: Could not process coordinates of point");
1480 PG_RETURN_NULL();
1481 }
1482
1483 /* skip point if outside raster */
1484 if (
1485 (xy[0] < 0 || xy[0] >= width) ||
1486 (xy[1] < 0 || xy[1] >= height)
1487 ) {
1488 elog(NOTICE, "Point is outside raster extent. Skipping");
1489 continue;
1490 }
1491
1492 /* get pixel value */
1493 if (rt_band_get_pixel(band, xy[0], xy[1], &value, &isnodata) != ES_NONE) {
1494 rtpg_setvaluesgv_arg_destroy(arg);
1495 rt_raster_destroy(raster);
1496 PG_FREE_IF_COPY(pgraster, 0);
1497 elog(ERROR, "RASTER_setPixelValuesGeomval: Could not get pixel value");
1498 PG_RETURN_NULL();
1499 }
1500
1501 /* keepnodata = TRUE AND pixel value is NODATA */
1502 if (arg->keepnodata && isnodata)
1503 continue;
1504
1505 /* set pixel */
1506 if (arg->gv[i].pixval.nodata)
1507 noerr = rt_band_set_pixel(band, xy[0], xy[1], nodataval, NULL);
1508 else
1509 noerr = rt_band_set_pixel(band, xy[0], xy[1], arg->gv[i].pixval.value, NULL);
1510
1511 if (noerr != ES_NONE) {
1512 rtpg_setvaluesgv_arg_destroy(arg);
1513 rt_raster_destroy(raster);
1514 PG_FREE_IF_COPY(pgraster, 0);
1515 elog(ERROR, "RASTER_setPixelValuesGeomval: Could not set pixel value");
1516 PG_RETURN_NULL();
1517 }
1518 }
1519 }
1520 }
1521 /* run iterator otherwise */
1522 else {
1523 rt_iterator itrset;
1524
1525 POSTGIS_RT_DEBUG(3, "a mix of geometries, using iterator method");
1526
1527 /* init itrset */
1528 itrset = palloc(sizeof(struct rt_iterator_t) * (arg->ngv + 1));
1529 if (itrset == NULL) {
1530 rtpg_setvaluesgv_arg_destroy(arg);
1531 rt_raster_destroy(raster);
1532 PG_FREE_IF_COPY(pgraster, 0);
1533 elog(ERROR, "RASTER_setPixelValuesGeomval: Could not allocate memory for iterator arguments");
1534 PG_RETURN_NULL();
1535 }
1536
1537 /* set first raster's info */
1538 itrset[0].raster = raster;
1539 itrset[0].nband = nband - 1;
1540 itrset[0].nbnodata = 1;
1541
1542 /* set other raster's info */
1543 for (i = 0, j = 1; i < arg->ngv; i++, j++) {
1544 itrset[j].raster = arg->gv[i].mask;
1545 itrset[j].nband = 0;
1546 itrset[j].nbnodata = 1;
1547 }
1548
1549 /* pass to iterator */
1550 noerr = rt_raster_iterator(
1551 itrset, arg->ngv + 1,
1552 ET_FIRST, NULL,
1553 pixtype,
1554 hasnodata, nodataval,
1555 0, 0,
1556 NULL,
1557 arg,
1558 rtpg_setvalues_geomval_callback,
1559 &_raster
1560 );
1561 pfree(itrset);
1562
1563 if (noerr != ES_NONE) {
1564 rtpg_setvaluesgv_arg_destroy(arg);
1565 rt_raster_destroy(raster);
1566 PG_FREE_IF_COPY(pgraster, 0);
1567 elog(ERROR, "RASTER_setPixelValuesGeomval: Could not run raster iterator function");
1568 PG_RETURN_NULL();
1569 }
1570
1571 /* copy band from _raster to raster */
1572 _band = rt_raster_get_band(_raster, 0);
1573 if (_band == NULL) {
1574 rtpg_setvaluesgv_arg_destroy(arg);
1575 rt_raster_destroy(_raster);
1576 rt_raster_destroy(raster);
1577 PG_FREE_IF_COPY(pgraster, 0);
1578 elog(ERROR, "RASTER_setPixelValuesGeomval: Could not get band from working raster");
1579 PG_RETURN_NULL();
1580 }
1581
1582 _band = rt_raster_replace_band(raster, _band, nband - 1);
1583 if (_band == NULL) {
1584 rtpg_setvaluesgv_arg_destroy(arg);
1585 rt_raster_destroy(_raster);
1586 rt_raster_destroy(raster);
1587 PG_FREE_IF_COPY(pgraster, 0);
1588 elog(ERROR, "RASTER_setPixelValuesGeomval: Could not replace band in output raster");
1589 PG_RETURN_NULL();
1590 }
1591
1592 rt_band_destroy(_band);
1593 rt_raster_destroy(_raster);
1594 }
1595
1596 rtpg_setvaluesgv_arg_destroy(arg);
1597
1598 pgrtn = rt_raster_serialize(raster);
1599 rt_raster_destroy(raster);
1600 PG_FREE_IF_COPY(pgraster, 0);
1601
1602 POSTGIS_RT_DEBUG(3, "Finished");
1603
1604 if (!pgrtn)
1605 PG_RETURN_NULL();
1606
1607 SET_VARSIZE(pgrtn, pgrtn->size);
1608 PG_RETURN_POINTER(pgrtn);
1609 }
1610
1611 #undef VALUES_LENGTH
1612 #define VALUES_LENGTH 3
1613
1614 /**
1615 * Get pixels of value
1616 */
1617 PG_FUNCTION_INFO_V1(RASTER_pixelOfValue);
RASTER_pixelOfValue(PG_FUNCTION_ARGS)1618 Datum RASTER_pixelOfValue(PG_FUNCTION_ARGS)
1619 {
1620 FuncCallContext *funcctx;
1621 TupleDesc tupdesc;
1622
1623 rt_pixel pixels = NULL;
1624 rt_pixel pixels2 = NULL;
1625 int count = 0;
1626 int i = 0;
1627 int n = 0;
1628 int call_cntr;
1629 int max_calls;
1630
1631 if (SRF_IS_FIRSTCALL()) {
1632 MemoryContext oldcontext;
1633
1634 rt_pgraster *pgraster = NULL;
1635 rt_raster raster = NULL;
1636 rt_band band = NULL;
1637 int nband = 1;
1638 int num_bands = 0;
1639 double *search = NULL;
1640 int nsearch = 0;
1641 double val;
1642 bool exclude_nodata_value = TRUE;
1643
1644 ArrayType *array;
1645 Oid etype;
1646 Datum *e;
1647 bool *nulls;
1648 int16 typlen;
1649 bool typbyval;
1650 char typalign;
1651
1652 /* create a function context for cross-call persistence */
1653 funcctx = SRF_FIRSTCALL_INIT();
1654
1655 /* switch to memory context appropriate for multiple function calls */
1656 oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
1657
1658 if (PG_ARGISNULL(0)) {
1659 MemoryContextSwitchTo(oldcontext);
1660 SRF_RETURN_DONE(funcctx);
1661 }
1662 pgraster = (rt_pgraster *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
1663 raster = rt_raster_deserialize(pgraster, FALSE);
1664 if (!raster) {
1665 PG_FREE_IF_COPY(pgraster, 0);
1666 MemoryContextSwitchTo(oldcontext);
1667 elog(ERROR, "RASTER_pixelOfValue: Could not deserialize raster");
1668 SRF_RETURN_DONE(funcctx);
1669 }
1670
1671 /* num_bands */
1672 num_bands = rt_raster_get_num_bands(raster);
1673 if (num_bands < 1) {
1674 elog(NOTICE, "Raster provided has no bands");
1675 rt_raster_destroy(raster);
1676 PG_FREE_IF_COPY(pgraster, 0);
1677 MemoryContextSwitchTo(oldcontext);
1678 SRF_RETURN_DONE(funcctx);
1679 }
1680
1681 /* band index is 1-based */
1682 if (!PG_ARGISNULL(1))
1683 nband = PG_GETARG_INT32(1);
1684 if (nband < 1 || nband > num_bands) {
1685 elog(NOTICE, "Invalid band index (must use 1-based). Returning NULL");
1686 rt_raster_destroy(raster);
1687 PG_FREE_IF_COPY(pgraster, 0);
1688 MemoryContextSwitchTo(oldcontext);
1689 SRF_RETURN_DONE(funcctx);
1690 }
1691
1692 /* search values */
1693 array = PG_GETARG_ARRAYTYPE_P(2);
1694 etype = ARR_ELEMTYPE(array);
1695 get_typlenbyvalalign(etype, &typlen, &typbyval, &typalign);
1696
1697 switch (etype) {
1698 case FLOAT4OID:
1699 case FLOAT8OID:
1700 break;
1701 default:
1702 rt_raster_destroy(raster);
1703 PG_FREE_IF_COPY(pgraster, 0);
1704 MemoryContextSwitchTo(oldcontext);
1705 elog(ERROR, "RASTER_pixelOfValue: Invalid data type for pixel values");
1706 SRF_RETURN_DONE(funcctx);
1707 break;
1708 }
1709
1710 deconstruct_array(array, etype, typlen, typbyval, typalign, &e,
1711 &nulls, &n);
1712
1713 search = palloc(sizeof(double) * n);
1714 for (i = 0, nsearch = 0; i < n; i++) {
1715 if (nulls[i]) continue;
1716
1717 switch (etype) {
1718 case FLOAT4OID:
1719 val = (double) DatumGetFloat4(e[i]);
1720 break;
1721 case FLOAT8OID:
1722 val = (double) DatumGetFloat8(e[i]);
1723 break;
1724 }
1725
1726 search[nsearch] = val;
1727 POSTGIS_RT_DEBUGF(3, "search[%d] = %f", nsearch, search[nsearch]);
1728 nsearch++;
1729 }
1730
1731 /* not searching for anything */
1732 if (nsearch < 1) {
1733 elog(NOTICE, "No search values provided. Returning NULL");
1734 pfree(search);
1735 rt_raster_destroy(raster);
1736 PG_FREE_IF_COPY(pgraster, 0);
1737 MemoryContextSwitchTo(oldcontext);
1738 SRF_RETURN_DONE(funcctx);
1739 }
1740 else if (nsearch < n)
1741 search = repalloc(search, sizeof(double) * nsearch);
1742
1743 /* exclude_nodata_value flag */
1744 if (!PG_ARGISNULL(3))
1745 exclude_nodata_value = PG_GETARG_BOOL(3);
1746
1747 /* get band */
1748 band = rt_raster_get_band(raster, nband - 1);
1749 if (!band) {
1750 elog(NOTICE, "Could not find band at index %d. Returning NULL", nband);
1751 rt_raster_destroy(raster);
1752 PG_FREE_IF_COPY(pgraster, 0);
1753 MemoryContextSwitchTo(oldcontext);
1754 SRF_RETURN_DONE(funcctx);
1755 }
1756
1757 /* get pixels of values */
1758 count = rt_band_get_pixel_of_value(
1759 band, exclude_nodata_value,
1760 search, nsearch,
1761 &pixels
1762 );
1763 pfree(search);
1764 rt_band_destroy(band);
1765 rt_raster_destroy(raster);
1766 PG_FREE_IF_COPY(pgraster, 0);
1767 if (count < 1) {
1768 /* error */
1769 if (count < 0)
1770 elog(NOTICE, "Could not get the pixels of search values for band at index %d", nband);
1771 /* no nearest pixel */
1772 else
1773 elog(NOTICE, "No pixels of search values found for band at index %d", nband);
1774
1775 MemoryContextSwitchTo(oldcontext);
1776 SRF_RETURN_DONE(funcctx);
1777 }
1778
1779 /* Store needed information */
1780 funcctx->user_fctx = pixels;
1781
1782 /* total number of tuples to be returned */
1783 funcctx->max_calls = count;
1784
1785 /* Build a tuple descriptor for our result type */
1786 if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE) {
1787 ereport(ERROR, (
1788 errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1789 errmsg(
1790 "function returning record called in context "
1791 "that cannot accept type record"
1792 )
1793 ));
1794 }
1795
1796 BlessTupleDesc(tupdesc);
1797 funcctx->tuple_desc = tupdesc;
1798
1799 MemoryContextSwitchTo(oldcontext);
1800 }
1801
1802 /* stuff done on every call of the function */
1803 funcctx = SRF_PERCALL_SETUP();
1804
1805 call_cntr = funcctx->call_cntr;
1806 max_calls = funcctx->max_calls;
1807 tupdesc = funcctx->tuple_desc;
1808 pixels2 = funcctx->user_fctx;
1809
1810 /* do when there is more left to send */
1811 if (call_cntr < max_calls) {
1812 Datum values[VALUES_LENGTH];
1813 bool nulls[VALUES_LENGTH];
1814 HeapTuple tuple;
1815 Datum result;
1816
1817 memset(nulls, FALSE, sizeof(bool) * VALUES_LENGTH);
1818
1819 /* 0-based to 1-based */
1820 pixels2[call_cntr].x += 1;
1821 pixels2[call_cntr].y += 1;
1822
1823 values[0] = Float8GetDatum(pixels2[call_cntr].value);
1824 values[1] = Int32GetDatum(pixels2[call_cntr].x);
1825 values[2] = Int32GetDatum(pixels2[call_cntr].y);
1826
1827 /* build a tuple */
1828 tuple = heap_form_tuple(tupdesc, values, nulls);
1829
1830 /* make the tuple into a datum */
1831 result = HeapTupleGetDatum(tuple);
1832
1833 SRF_RETURN_NEXT(funcctx, result);
1834 }
1835 else {
1836 pfree(pixels2);
1837 SRF_RETURN_DONE(funcctx);
1838 }
1839 }
1840
1841 /**
1842 * Return nearest value to a point
1843 */
1844 PG_FUNCTION_INFO_V1(RASTER_nearestValue);
RASTER_nearestValue(PG_FUNCTION_ARGS)1845 Datum RASTER_nearestValue(PG_FUNCTION_ARGS)
1846 {
1847 rt_pgraster *pgraster = NULL;
1848 rt_raster raster = NULL;
1849 rt_band band = NULL;
1850 int bandindex = 1;
1851 int num_bands = 0;
1852 GSERIALIZED *geom;
1853 bool exclude_nodata_value = TRUE;
1854 LWGEOM *lwgeom;
1855 LWPOINT *point = NULL;
1856 POINT2D p;
1857
1858 double x;
1859 double y;
1860 int count;
1861 rt_pixel npixels = NULL;
1862 double value = 0;
1863 int hasvalue = 0;
1864 int isnodata = 0;
1865
1866 if (PG_ARGISNULL(0))
1867 PG_RETURN_NULL();
1868 pgraster = (rt_pgraster *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
1869 raster = rt_raster_deserialize(pgraster, FALSE);
1870 if (!raster) {
1871 PG_FREE_IF_COPY(pgraster, 0);
1872 elog(ERROR, "RASTER_nearestValue: Could not deserialize raster");
1873 PG_RETURN_NULL();
1874 }
1875
1876 /* band index is 1-based */
1877 if (!PG_ARGISNULL(1))
1878 bandindex = PG_GETARG_INT32(1);
1879 num_bands = rt_raster_get_num_bands(raster);
1880 if (bandindex < 1 || bandindex > num_bands) {
1881 elog(NOTICE, "Invalid band index (must use 1-based). Returning NULL");
1882 rt_raster_destroy(raster);
1883 PG_FREE_IF_COPY(pgraster, 0);
1884 PG_RETURN_NULL();
1885 }
1886
1887 /* point */
1888 geom = PG_GETARG_GSERIALIZED_P(2);
1889 if (gserialized_get_type(geom) != POINTTYPE) {
1890 elog(NOTICE, "Geometry provided must be a point");
1891 rt_raster_destroy(raster);
1892 PG_FREE_IF_COPY(pgraster, 0);
1893 PG_FREE_IF_COPY(geom, 2);
1894 PG_RETURN_NULL();
1895 }
1896
1897 /* exclude_nodata_value flag */
1898 if (!PG_ARGISNULL(3))
1899 exclude_nodata_value = PG_GETARG_BOOL(3);
1900
1901 /* SRIDs of raster and geometry must match */
1902 if (clamp_srid(gserialized_get_srid(geom)) != clamp_srid(rt_raster_get_srid(raster))) {
1903 elog(NOTICE, "SRIDs of geometry and raster do not match");
1904 rt_raster_destroy(raster);
1905 PG_FREE_IF_COPY(pgraster, 0);
1906 PG_FREE_IF_COPY(geom, 2);
1907 PG_RETURN_NULL();
1908 }
1909
1910 /* get band */
1911 band = rt_raster_get_band(raster, bandindex - 1);
1912 if (!band) {
1913 elog(NOTICE, "Could not find band at index %d. Returning NULL", bandindex);
1914 rt_raster_destroy(raster);
1915 PG_FREE_IF_COPY(pgraster, 0);
1916 PG_FREE_IF_COPY(geom, 2);
1917 PG_RETURN_NULL();
1918 }
1919
1920 /* process geometry */
1921 lwgeom = lwgeom_from_gserialized(geom);
1922
1923 if (lwgeom_is_empty(lwgeom)) {
1924 elog(NOTICE, "Geometry provided cannot be empty");
1925 rt_raster_destroy(raster);
1926 PG_FREE_IF_COPY(pgraster, 0);
1927 PG_FREE_IF_COPY(geom, 2);
1928 PG_RETURN_NULL();
1929 }
1930
1931 /* Get a 2D version of the geometry if necessary */
1932 if (lwgeom_ndims(lwgeom) > 2) {
1933 LWGEOM *lwgeom2d = lwgeom_force_2d(lwgeom);
1934 lwgeom_free(lwgeom);
1935 lwgeom = lwgeom2d;
1936 }
1937
1938 point = lwgeom_as_lwpoint(lwgeom);
1939 getPoint2d_p(point->point, 0, &p);
1940
1941 if (rt_raster_geopoint_to_cell(
1942 raster,
1943 p.x, p.y,
1944 &x, &y,
1945 NULL
1946 ) != ES_NONE) {
1947 rt_raster_destroy(raster);
1948 PG_FREE_IF_COPY(pgraster, 0);
1949 lwgeom_free(lwgeom);
1950 PG_FREE_IF_COPY(geom, 2);
1951 elog(ERROR, "RASTER_nearestValue: Could not compute pixel coordinates from spatial coordinates");
1952 PG_RETURN_NULL();
1953 }
1954
1955 /* get value at point */
1956 if (
1957 (x >= 0 && x < rt_raster_get_width(raster)) &&
1958 (y >= 0 && y < rt_raster_get_height(raster))
1959 ) {
1960 if (rt_band_get_pixel(band, x, y, &value, &isnodata) != ES_NONE) {
1961 rt_raster_destroy(raster);
1962 PG_FREE_IF_COPY(pgraster, 0);
1963 lwgeom_free(lwgeom);
1964 PG_FREE_IF_COPY(geom, 2);
1965 elog(ERROR, "RASTER_nearestValue: Could not get pixel value for band at index %d", bandindex);
1966 PG_RETURN_NULL();
1967 }
1968
1969 /* value at point, return value */
1970 if (!exclude_nodata_value || !isnodata) {
1971 rt_raster_destroy(raster);
1972 PG_FREE_IF_COPY(pgraster, 0);
1973 lwgeom_free(lwgeom);
1974 PG_FREE_IF_COPY(geom, 2);
1975
1976 PG_RETURN_FLOAT8(value);
1977 }
1978 }
1979
1980 /* get neighborhood */
1981 count = rt_band_get_nearest_pixel(
1982 band,
1983 x, y,
1984 0, 0,
1985 exclude_nodata_value,
1986 &npixels
1987 );
1988 rt_band_destroy(band);
1989 /* error or no neighbors */
1990 if (count < 1) {
1991 /* error */
1992 if (count < 0)
1993 elog(NOTICE, "Could not get the nearest value for band at index %d", bandindex);
1994 /* no nearest pixel */
1995 else
1996 elog(NOTICE, "No nearest value found for band at index %d", bandindex);
1997
1998 lwgeom_free(lwgeom);
1999 PG_FREE_IF_COPY(geom, 2);
2000 rt_raster_destroy(raster);
2001 PG_FREE_IF_COPY(pgraster, 0);
2002 PG_RETURN_NULL();
2003 }
2004
2005 /* more than one nearest value, see which one is closest */
2006 if (count > 1) {
2007 int i = 0;
2008 LWPOLY *poly = NULL;
2009 double lastdist = -1;
2010 double dist;
2011
2012 for (i = 0; i < count; i++) {
2013 /* convex-hull of pixel */
2014 poly = rt_raster_pixel_as_polygon(raster, npixels[i].x, npixels[i].y);
2015 if (!poly) {
2016 lwgeom_free(lwgeom);
2017 PG_FREE_IF_COPY(geom, 2);
2018 rt_raster_destroy(raster);
2019 PG_FREE_IF_COPY(pgraster, 0);
2020 elog(ERROR, "RASTER_nearestValue: Could not get polygon of neighboring pixel");
2021 PG_RETURN_NULL();
2022 }
2023
2024 /* distance between convex-hull and point */
2025 dist = lwgeom_mindistance2d(lwpoly_as_lwgeom(poly), lwgeom);
2026 if (lastdist < 0 || dist < lastdist) {
2027 value = npixels[i].value;
2028 hasvalue = 1;
2029 }
2030 lastdist = dist;
2031
2032 lwpoly_free(poly);
2033 }
2034 }
2035 else {
2036 value = npixels[0].value;
2037 hasvalue = 1;
2038 }
2039
2040 pfree(npixels);
2041 lwgeom_free(lwgeom);
2042 PG_FREE_IF_COPY(geom, 2);
2043 rt_raster_destroy(raster);
2044 PG_FREE_IF_COPY(pgraster, 0);
2045
2046 if (hasvalue)
2047 PG_RETURN_FLOAT8(value);
2048 else
2049 PG_RETURN_NULL();
2050 }
2051
2052 /**
2053 * Return the neighborhood around a pixel
2054 */
2055 PG_FUNCTION_INFO_V1(RASTER_neighborhood);
RASTER_neighborhood(PG_FUNCTION_ARGS)2056 Datum RASTER_neighborhood(PG_FUNCTION_ARGS)
2057 {
2058 rt_pgraster *pgraster = NULL;
2059 rt_raster raster = NULL;
2060 rt_band band = NULL;
2061 int bandindex = 1;
2062 int num_bands = 0;
2063 int x = 0;
2064 int y = 0;
2065 int _x = 0;
2066 int _y = 0;
2067 int distance[2] = {0};
2068 bool exclude_nodata_value = TRUE;
2069 double pixval;
2070 int isnodata = 0;
2071
2072 rt_pixel npixels = NULL;
2073 int count;
2074 double **value2D = NULL;
2075 int **nodata2D = NULL;
2076
2077 int i = 0;
2078 int j = 0;
2079 int k = 0;
2080 Datum *value1D = NULL;
2081 bool *nodata1D = NULL;
2082 int dim[2] = {0};
2083 int lbound[2] = {1, 1};
2084 ArrayType *mdArray = NULL;
2085
2086 int16 typlen;
2087 bool typbyval;
2088 char typalign;
2089
2090 /* pgraster is null, return nothing */
2091 if (PG_ARGISNULL(0))
2092 PG_RETURN_NULL();
2093 pgraster = (rt_pgraster *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
2094
2095 raster = rt_raster_deserialize(pgraster, FALSE);
2096 if (!raster) {
2097 PG_FREE_IF_COPY(pgraster, 0);
2098 elog(ERROR, "RASTER_neighborhood: Could not deserialize raster");
2099 PG_RETURN_NULL();
2100 }
2101
2102 /* band index is 1-based */
2103 if (!PG_ARGISNULL(1))
2104 bandindex = PG_GETARG_INT32(1);
2105 num_bands = rt_raster_get_num_bands(raster);
2106 if (bandindex < 1 || bandindex > num_bands) {
2107 elog(NOTICE, "Invalid band index (must use 1-based). Returning NULL");
2108 rt_raster_destroy(raster);
2109 PG_FREE_IF_COPY(pgraster, 0);
2110 PG_RETURN_NULL();
2111 }
2112
2113 /* pixel column, 1-based */
2114 x = PG_GETARG_INT32(2);
2115 _x = x - 1;
2116
2117 /* pixel row, 1-based */
2118 y = PG_GETARG_INT32(3);
2119 _y = y - 1;
2120
2121 /* distance X axis */
2122 distance[0] = PG_GETARG_INT32(4);
2123 if (distance[0] < 0) {
2124 elog(NOTICE, "Invalid value for distancex (must be >= zero). Returning NULL");
2125 rt_raster_destroy(raster);
2126 PG_FREE_IF_COPY(pgraster, 0);
2127 PG_RETURN_NULL();
2128 }
2129 distance[0] = (uint16_t) distance[0];
2130
2131 /* distance Y axis */
2132 distance[1] = PG_GETARG_INT32(5);
2133 if (distance[1] < 0) {
2134 elog(NOTICE, "Invalid value for distancey (must be >= zero). Returning NULL");
2135 rt_raster_destroy(raster);
2136 PG_FREE_IF_COPY(pgraster, 0);
2137 PG_RETURN_NULL();
2138 }
2139 distance[1] = (uint16_t) distance[1];
2140
2141 /* exclude_nodata_value flag */
2142 if (!PG_ARGISNULL(6))
2143 exclude_nodata_value = PG_GETARG_BOOL(6);
2144
2145 /* get band */
2146 band = rt_raster_get_band(raster, bandindex - 1);
2147 if (!band) {
2148 elog(NOTICE, "Could not find band at index %d. Returning NULL", bandindex);
2149 rt_raster_destroy(raster);
2150 PG_FREE_IF_COPY(pgraster, 0);
2151 PG_RETURN_NULL();
2152 }
2153
2154 /* get neighborhood */
2155 count = 0;
2156 npixels = NULL;
2157 if (distance[0] > 0 || distance[1] > 0) {
2158 count = rt_band_get_nearest_pixel(
2159 band,
2160 _x, _y,
2161 distance[0], distance[1],
2162 exclude_nodata_value,
2163 &npixels
2164 );
2165 /* error */
2166 if (count < 0) {
2167 elog(NOTICE, "Could not get the pixel's neighborhood for band at index %d", bandindex);
2168
2169 rt_band_destroy(band);
2170 rt_raster_destroy(raster);
2171 PG_FREE_IF_COPY(pgraster, 0);
2172
2173 PG_RETURN_NULL();
2174 }
2175 }
2176
2177 /* get pixel's value */
2178 if (
2179 (_x >= 0 && _x < rt_band_get_width(band)) &&
2180 (_y >= 0 && _y < rt_band_get_height(band))
2181 ) {
2182 if (rt_band_get_pixel(
2183 band,
2184 _x, _y,
2185 &pixval,
2186 &isnodata
2187 ) != ES_NONE) {
2188 elog(NOTICE, "Could not get the pixel of band at index %d. Returning NULL", bandindex);
2189 rt_band_destroy(band);
2190 rt_raster_destroy(raster);
2191 PG_FREE_IF_COPY(pgraster, 0);
2192 PG_RETURN_NULL();
2193 }
2194 }
2195 /* outside band extent, set to NODATA */
2196 else {
2197 /* has NODATA, use NODATA */
2198 if (rt_band_get_hasnodata_flag(band))
2199 rt_band_get_nodata(band, &pixval);
2200 /* no NODATA, use min possible value */
2201 else
2202 pixval = rt_band_get_min_value(band);
2203 isnodata = 1;
2204 }
2205 POSTGIS_RT_DEBUGF(4, "pixval: %f", pixval);
2206
2207
2208 /* add pixel to neighborhood */
2209 count++;
2210 if (count > 1)
2211 npixels = (rt_pixel) repalloc(npixels, sizeof(struct rt_pixel_t) * count);
2212 else
2213 npixels = (rt_pixel) palloc(sizeof(struct rt_pixel_t));
2214 if (npixels == NULL) {
2215
2216 rt_band_destroy(band);
2217 rt_raster_destroy(raster);
2218 PG_FREE_IF_COPY(pgraster, 0);
2219
2220 elog(ERROR, "RASTER_neighborhood: Could not reallocate memory for neighborhood");
2221 PG_RETURN_NULL();
2222 }
2223 npixels[count - 1].x = _x;
2224 npixels[count - 1].y = _y;
2225 npixels[count - 1].nodata = 1;
2226 npixels[count - 1].value = pixval;
2227
2228 /* set NODATA */
2229 if (!exclude_nodata_value || !isnodata) {
2230 npixels[count - 1].nodata = 0;
2231 }
2232
2233 /* free unnecessary stuff */
2234 rt_band_destroy(band);
2235 rt_raster_destroy(raster);
2236 PG_FREE_IF_COPY(pgraster, 0);
2237
2238 /* convert set of rt_pixel to 2D array */
2239 /* dim is passed with element 0 being Y-axis and element 1 being X-axis */
2240 count = rt_pixel_set_to_array(
2241 npixels, count, NULL,
2242 _x, _y,
2243 distance[0], distance[1],
2244 &value2D,
2245 &nodata2D,
2246 &(dim[1]), &(dim[0])
2247 );
2248 pfree(npixels);
2249 if (count != ES_NONE) {
2250 elog(NOTICE, "Could not create 2D array of neighborhood");
2251 PG_RETURN_NULL();
2252 }
2253
2254 /* 1D arrays for values and nodata from 2D arrays */
2255 value1D = palloc(sizeof(Datum) * dim[0] * dim[1]);
2256 nodata1D = palloc(sizeof(bool) * dim[0] * dim[1]);
2257
2258 if (value1D == NULL || nodata1D == NULL) {
2259
2260 for (i = 0; i < dim[0]; i++) {
2261 pfree(value2D[i]);
2262 pfree(nodata2D[i]);
2263 }
2264 pfree(value2D);
2265 pfree(nodata2D);
2266
2267 elog(ERROR, "RASTER_neighborhood: Could not allocate memory for return 2D array");
2268 PG_RETURN_NULL();
2269 }
2270
2271 /* copy values from 2D arrays to 1D arrays */
2272 k = 0;
2273 /* Y-axis */
2274 for (i = 0; i < dim[0]; i++) {
2275 /* X-axis */
2276 for (j = 0; j < dim[1]; j++) {
2277 nodata1D[k] = (bool) nodata2D[i][j];
2278 if (!nodata1D[k])
2279 value1D[k] = Float8GetDatum(value2D[i][j]);
2280 else
2281 value1D[k] = PointerGetDatum(NULL);
2282
2283 k++;
2284 }
2285 }
2286
2287 /* no more need for 2D arrays */
2288 for (i = 0; i < dim[0]; i++) {
2289 pfree(value2D[i]);
2290 pfree(nodata2D[i]);
2291 }
2292 pfree(value2D);
2293 pfree(nodata2D);
2294
2295 /* info about the type of item in the multi-dimensional array (float8). */
2296 get_typlenbyvalalign(FLOAT8OID, &typlen, &typbyval, &typalign);
2297
2298 mdArray = construct_md_array(
2299 value1D, nodata1D,
2300 2, dim, lbound,
2301 FLOAT8OID,
2302 typlen, typbyval, typalign
2303 );
2304
2305 pfree(value1D);
2306 pfree(nodata1D);
2307
2308 PG_RETURN_ARRAYTYPE_P(mdArray);
2309 }
2310
2311