PostGIS  2.3.7dev-r@@SVN_REVISION@@
int rt_raster_generate_new_band ( rt_raster  raster,
rt_pixtype  pixtype,
double  initialvalue,
uint32_t  hasnodata,
double  nodatavalue,
int  index 
)

Generate a new inline band and add it to a raster.

Parameters
raster: the raster to add a band to
pixtype: the pixel type for the new band
initialvalue: initial value for pixels
hasnodata: indicates if the band has a nodata value
nodatavalue: nodata value for the new band
index: position to add the new band in the raster
Returns
identifier (position) for the just-added raster, or -1 on error

Memory is allocated in this function for band data.

Parameters
raster: the raster to add a band to
pixtype: the pixel type for the new band
initialvalue: initial value for pixels
hasnodata: indicates if the band has a nodata value
nodatavalue: nodata value for the new band
index: position to add the new band in the raster
Returns
identifier (position) for the just-added raster, or -1 on error

Definition at line 485 of file rt_raster.c.

References ovdump::band, FLT_EQ, PT_16BSI, PT_16BUI, PT_1BB, PT_2BUI, PT_32BF, PT_32BSI, PT_32BUI, PT_4BUI, PT_64BF, PT_8BSI, PT_8BUI, rt_band_destroy(), rt_band_new_inline(), rt_band_set_isnodata_flag(), rt_band_set_ownsdata_flag(), rt_pixtype_size(), rt_raster_add_band(), rt_raster_get_height(), rt_raster_get_num_bands(), rt_raster_get_width(), rt_util_clamp_to_16BSI(), rt_util_clamp_to_16BUI(), rt_util_clamp_to_1BB(), rt_util_clamp_to_2BUI(), rt_util_clamp_to_32BSI(), rt_util_clamp_to_32BUI(), rt_util_clamp_to_32F(), rt_util_clamp_to_4BUI(), rt_util_clamp_to_8BSI(), rt_util_clamp_to_8BUI(), rt_util_dbl_trunc_warning(), rtalloc(), rtdealloc(), and rterror().

Referenced by RASTER_addBand(), RASTER_clip(), RASTER_mapAlgebra2(), RASTER_mapAlgebraExpr(), RASTER_mapAlgebraFct(), RASTER_mapAlgebraFctNgb(), RASTER_tile(), RASTER_union_transfn(), rt_raster_from_gdal_dataset(), and rt_raster_iterator().

489  {
490  rt_band band = NULL;
491  int width = 0;
492  int height = 0;
493  int numval = 0;
494  int datasize = 0;
495  int oldnumbands = 0;
496  int numbands = 0;
497  void * mem = NULL;
498  int32_t checkvalint = 0;
499  uint32_t checkvaluint = 0;
500  double checkvaldouble = 0;
501  float checkvalfloat = 0;
502  int i;
503 
504 
505  assert(NULL != raster);
506 
507  /* Make sure index is in a valid range */
508  oldnumbands = rt_raster_get_num_bands(raster);
509  if (index < 0)
510  index = 0;
511  else if (index > oldnumbands + 1)
512  index = oldnumbands + 1;
513 
514  /* Determine size of memory block to allocate and allocate it */
515  width = rt_raster_get_width(raster);
516  height = rt_raster_get_height(raster);
517  numval = width * height;
518  datasize = rt_pixtype_size(pixtype) * numval;
519 
520  mem = (int *)rtalloc(datasize);
521  if (!mem) {
522  rterror("rt_raster_generate_new_band: Could not allocate memory for band");
523  return -1;
524  }
525 
526  if (FLT_EQ(initialvalue, 0.0))
527  memset(mem, 0, datasize);
528  else {
529  switch (pixtype)
530  {
531  case PT_1BB:
532  {
533  uint8_t *ptr = mem;
534  uint8_t clamped_initval = rt_util_clamp_to_1BB(initialvalue);
535  for (i = 0; i < numval; i++)
536  ptr[i] = clamped_initval;
537  checkvalint = ptr[0];
538  break;
539  }
540  case PT_2BUI:
541  {
542  uint8_t *ptr = mem;
543  uint8_t clamped_initval = rt_util_clamp_to_2BUI(initialvalue);
544  for (i = 0; i < numval; i++)
545  ptr[i] = clamped_initval;
546  checkvalint = ptr[0];
547  break;
548  }
549  case PT_4BUI:
550  {
551  uint8_t *ptr = mem;
552  uint8_t clamped_initval = rt_util_clamp_to_4BUI(initialvalue);
553  for (i = 0; i < numval; i++)
554  ptr[i] = clamped_initval;
555  checkvalint = ptr[0];
556  break;
557  }
558  case PT_8BSI:
559  {
560  int8_t *ptr = mem;
561  int8_t clamped_initval = rt_util_clamp_to_8BSI(initialvalue);
562  for (i = 0; i < numval; i++)
563  ptr[i] = clamped_initval;
564  checkvalint = ptr[0];
565  break;
566  }
567  case PT_8BUI:
568  {
569  uint8_t *ptr = mem;
570  uint8_t clamped_initval = rt_util_clamp_to_8BUI(initialvalue);
571  for (i = 0; i < numval; i++)
572  ptr[i] = clamped_initval;
573  checkvalint = ptr[0];
574  break;
575  }
576  case PT_16BSI:
577  {
578  int16_t *ptr = mem;
579  int16_t clamped_initval = rt_util_clamp_to_16BSI(initialvalue);
580  for (i = 0; i < numval; i++)
581  ptr[i] = clamped_initval;
582  checkvalint = ptr[0];
583  break;
584  }
585  case PT_16BUI:
586  {
587  uint16_t *ptr = mem;
588  uint16_t clamped_initval = rt_util_clamp_to_16BUI(initialvalue);
589  for (i = 0; i < numval; i++)
590  ptr[i] = clamped_initval;
591  checkvalint = ptr[0];
592  break;
593  }
594  case PT_32BSI:
595  {
596  int32_t *ptr = mem;
597  int32_t clamped_initval = rt_util_clamp_to_32BSI(initialvalue);
598  for (i = 0; i < numval; i++)
599  ptr[i] = clamped_initval;
600  checkvalint = ptr[0];
601  break;
602  }
603  case PT_32BUI:
604  {
605  uint32_t *ptr = mem;
606  uint32_t clamped_initval = rt_util_clamp_to_32BUI(initialvalue);
607  for (i = 0; i < numval; i++)
608  ptr[i] = clamped_initval;
609  checkvaluint = ptr[0];
610  break;
611  }
612  case PT_32BF:
613  {
614  float *ptr = mem;
615  float clamped_initval = rt_util_clamp_to_32F(initialvalue);
616  for (i = 0; i < numval; i++)
617  ptr[i] = clamped_initval;
618  checkvalfloat = ptr[0];
619  break;
620  }
621  case PT_64BF:
622  {
623  double *ptr = mem;
624  for (i = 0; i < numval; i++)
625  ptr[i] = initialvalue;
626  checkvaldouble = ptr[0];
627  break;
628  }
629  default:
630  {
631  rterror("rt_raster_generate_new_band: Unknown pixeltype %d", pixtype);
632  rtdealloc(mem);
633  return -1;
634  }
635  }
636  }
637 
638  /* Overflow checking */
640  initialvalue,
641  checkvalint, checkvaluint,
642  checkvalfloat, checkvaldouble,
643  pixtype
644  );
645 
646  band = rt_band_new_inline(width, height, pixtype, hasnodata, nodatavalue, mem);
647  if (! band) {
648  rterror("rt_raster_generate_new_band: Could not add band to raster. Aborting");
649  rtdealloc(mem);
650  return -1;
651  }
652  rt_band_set_ownsdata_flag(band, 1); /* we DO own this data!!! */
653  index = rt_raster_add_band(raster, band, index);
654  numbands = rt_raster_get_num_bands(raster);
655  if (numbands == oldnumbands || index == -1) {
656  rterror("rt_raster_generate_new_band: Could not add band to raster. Aborting");
657  rt_band_destroy(band);
658  }
659 
660  /* set isnodata if hasnodata = TRUE and initial value = nodatavalue */
661  if (hasnodata && FLT_EQ(initialvalue, nodatavalue))
662  rt_band_set_isnodata_flag(band, 1);
663 
664  return index;
665 }
int32_t rt_util_clamp_to_32BSI(double value)
Definition: rt_util.c:69
uint32_t rt_util_clamp_to_32BUI(double value)
Definition: rt_util.c:74
int rt_raster_add_band(rt_raster raster, rt_band band, int index)
Add band data to a raster.
Definition: rt_raster.c:405
int rt_raster_get_num_bands(rt_raster raster)
Definition: rt_raster.c:372
#define FLT_EQ(x, y)
Definition: librtcore.h:2197
void rterror(const char *fmt,...)
Wrappers used for reporting errors and info.
Definition: rt_context.c:199
tuple band
Definition: ovdump.py:57
void * rtalloc(size_t size)
Wrappers used for managing memory.
Definition: rt_context.c:171
void rt_band_destroy(rt_band band)
Destroy a raster band.
Definition: rt_band.c:242
uint16_t rt_util_clamp_to_16BUI(double value)
Definition: rt_util.c:64
void rt_band_set_ownsdata_flag(rt_band band, int flag)
Definition: rt_band.c:534
int8_t rt_util_clamp_to_8BSI(double value)
Definition: rt_util.c:49
int rt_util_dbl_trunc_warning(double initialvalue, int32_t checkvalint, uint32_t checkvaluint, float checkvalfloat, double checkvaldouble, rt_pixtype pixtype)
Definition: rt_util.c:625
rt_band rt_band_new_inline(uint16_t width, uint16_t height, rt_pixtype pixtype, uint32_t hasnodata, double nodataval, uint8_t *data)
Create an in-db rt_band with no data.
Definition: rt_band.c:58
uint8_t rt_util_clamp_to_4BUI(double value)
Definition: rt_util.c:44
uint8_t rt_util_clamp_to_8BUI(double value)
Definition: rt_util.c:54
int rt_pixtype_size(rt_pixtype pixtype)
Return size in bytes of a value in the given pixtype.
Definition: rt_pixel.c:39
uint8_t rt_util_clamp_to_1BB(double value)
Definition: rt_util.c:34
rt_errorstate rt_band_set_isnodata_flag(rt_band band, int flag)
Set isnodata flag value.
Definition: rt_band.c:562
void rtdealloc(void *mem)
Definition: rt_context.c:186
uint8_t rt_util_clamp_to_2BUI(double value)
Definition: rt_util.c:39
float rt_util_clamp_to_32F(double value)
Definition: rt_util.c:79
uint16_t rt_raster_get_height(rt_raster raster)
Definition: rt_raster.c:129
uint16_t rt_raster_get_width(rt_raster raster)
Definition: rt_raster.c:121
int16_t rt_util_clamp_to_16BSI(double value)
Definition: rt_util.c:59

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