/usr/include/gmt/gmt_grdio.h is in libgmt-dev 5.4.3+dfsg-1.
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* $Id: gmt_grdio.h 19521 2017-12-27 22:38:24Z pwessel $
*
* Copyright (c) 1991-2018 by P. Wessel, W. H. F. Smith, R. Scharroo, J. Luis and F. Wobbe
* See LICENSE.TXT file for copying and redistribution conditions.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; version 3 or 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 Lesser General Public License for more details.
*
* Contact info: gmt.soest.hawaii.edu
*--------------------------------------------------------------------*/
/*
* Include file for grd i/o
*
* Author: Paul Wessel
* Date: 1-JAN-2010
* Version: 5 API
*/
/*!
* \file gmt_grdio.h
* \brief Include file for grd i/o
*/
#ifndef GMT_GRDIO_H
#define GMT_GRDIO_H
/* Constants for *.img grids */
#define GMT_IMG_MINLON 0.0
#define GMT_IMG_MAXLON 360.0
#define GMT_IMG_MINLAT_72 -72.0059773539
#define GMT_IMG_MAXLAT_72 +72.0059773539
#define GMT_IMG_MINLAT_80 -80.7380086280
#define GMT_IMG_MAXLAT_80 +80.7380086280
#define GMT_IMG_MINLAT_85 -85.0511287798
#define GMT_IMG_MAXLAT_85 +85.0511287798
enum GMT_enum_img {
GMT_IMG_NLON_1M = 21600U, /* At 1 min resolution */
GMT_IMG_NLON_2M = 10800U, /* At 2 min resolution */
GMT_IMG_NLAT_1M_72 = 12672U, /* At 1 min resolution */
GMT_IMG_NLAT_2M_72 = 6336U, /* At 2 min resolution */
GMT_IMG_NLAT_1M_80 = 17280U, /* At 1 min resolution */
GMT_IMG_NLAT_2M_80 = 8640U, /* At 2 min resolution */
GMT_IMG_NLAT_1M_85 = 21600U, /* At 1 min resolution */
GMT_IMG_NLAT_2M_85 = 10800U, /* At 2 min resolution */
GMT_IMG_ITEMSIZE = 2U /* Size of 2 byte short ints */
};
/*! Special grid format IDs */
enum Gmt_grid_id {
/* DO NOT change the order because id values have grown historically.
* Append newly introduced id's at the end. */
k_grd_unknown_fmt = 0, /* if grid format cannot be auto-detected */
GMT_GRID_IS_BF, /* GMT native, C-binary format (32-bit float) */
GMT_GRID_IS_BS, /* GMT native, C-binary format (16-bit integer) */
GMT_GRID_IS_RB, /* SUN rasterfile format (8-bit standard) */
GMT_GRID_IS_BB, /* GMT native, C-binary format (8-bit integer) */
GMT_GRID_IS_BM, /* GMT native, C-binary format (bit-mask) */
GMT_GRID_IS_SF, /* Golden Software Surfer format 6 (32-bit float) */
GMT_GRID_IS_CB, /* GMT netCDF format (8-bit integer) */
GMT_GRID_IS_CS, /* GMT netCDF format (16-bit integer) */
GMT_GRID_IS_CI, /* GMT netCDF format (32-bit integer) */
GMT_GRID_IS_CF, /* GMT netCDF format (32-bit float) */
GMT_GRID_IS_CD, /* GMT netCDF format (64-bit float) */
GMT_GRID_IS_RF, /* GEODAS grid format GRD98 (NGDC) */
GMT_GRID_IS_BI, /* GMT native, C-binary format (32-bit integer) */
GMT_GRID_IS_BD, /* GMT native, C-binary format (64-bit float) */
GMT_GRID_IS_NB, /* GMT netCDF format (8-bit integer) */
GMT_GRID_IS_NS, /* GMT netCDF format (16-bit integer) */
GMT_GRID_IS_NI, /* GMT netCDF format (32-bit integer) */
GMT_GRID_IS_NF, /* GMT netCDF format (32-bit float) */
GMT_GRID_IS_ND, /* GMT netCDF format (64-bit float) */
GMT_GRID_IS_SD, /* Golden Software Surfer format 7 (64-bit float, read-only) */
GMT_GRID_IS_AF, /* Atlantic Geoscience Center format AGC (32-bit float) */
GMT_GRID_IS_GD, /* Import through GDAL */
GMT_GRID_IS_EI, /* ESRI Arc/Info ASCII Grid Interchange format (ASCII integer) */
GMT_GRID_IS_EF /* ESRI Arc/Info ASCII Grid Interchange format (ASCII float, write-only) */
};
#define GMT_N_GRD_FORMATS 25 /* Number of formats above plus 1 */
#define GMT_GRID_IS_GOLDEN7 GMT_GRID_IS_SD
#define GMT_GRID_IS_GDAL GMT_GRID_IS_GD
#include "gmt_customio.h"
/*! Holds any -R -I -F settings passed indirectly via -R<grdfile> */
struct GMT_GRID_INFO {
struct GMT_GRID_HEADER grd; /* Header of grid file passed via -R */
bool active; /* true if initialized via -R */
};
/*! Holds book-keeping information needed for row-by-row actions */
struct GMT_GRID_ROWBYROW {
size_t size; /* Bytes per item [4 for float, 1 for byte, etc] */
size_t n_byte; /* Number of bytes for row */
unsigned int row; /* Current row */
bool open; /* true if we have already opened the file */
bool check; /* true if we must replace NaNs with another representation on i/o */
bool auto_advance; /* true if we want to read file sequentially */
int fid; /* NetCDF file number [netcdf files only] */
size_t edge[2]; /* Dimension arrays [netcdf files only] */
size_t start[2]; /* Position arrays [netcdf files only] */
#ifdef DEBUG
off_t pos; /* Current file pos for binary files */
#endif
FILE *fp; /* File pointer [for native files] */
void *v_row; /* Void Row pointer for any data format */
};
#ifdef __APPLE__ /* Accelerate framework */
#include <Accelerate/Accelerate.h>
#undef I /* because otherwise we are in trouble with, e.g., struct GMT_IMAGE *I */
#endif
/*! Routine that scales and offsets the data in a vector */
static inline void scale_and_offset_f (float *data, size_t length, float scale, float offset) {
/* data: Single-precision real input vector
* length: The number of elements to process
* This function uses the vDSP portion of the Accelerate framework if possible */
#ifndef __APPLE__
size_t n;
#endif
if (scale == 1) /* offset only */
#ifdef __APPLE__ /* Accelerate framework */
vDSP_vsadd (data, 1, &offset, data, 1, length);
#else
for (n = 0; n < length; ++n)
data[n] += offset;
#endif
else if (offset == 0) /* scale only */
#ifdef __APPLE__ /* Accelerate framework */
vDSP_vsmul (data, 1, &scale, data, 1, length);
#else
for (n = 0; n < length; ++n)
data[n] *= scale;
#endif
else /* scale + offset */
#ifdef __APPLE__ /* Accelerate framework */
vDSP_vsmsa (data, 1, &scale, &offset, data, 1, length);
#else
for (n = 0; n < length; ++n)
data[n] = data[n] * scale + offset;
#endif
}
EXTERN_MSC int gmt_grd_format_decoder (struct GMT_CTRL *GMT, const char *code, unsigned int *type_id);
EXTERN_MSC int gmt_grd_get_format (struct GMT_CTRL *GMT, char *file, struct GMT_GRID_HEADER *header, bool magic);
EXTERN_MSC int gmt_grd_prep_io (struct GMT_CTRL *GMT, struct GMT_GRID_HEADER *header, double wesn[], unsigned int *width, unsigned int *height, int *first_col, int *last_col, int *first_row, int *last_row, unsigned int **index);
EXTERN_MSC int gmt_update_grd_info (struct GMT_CTRL *GMT, char *file, struct GMT_GRID_HEADER *header);
EXTERN_MSC void gmt_scale_and_offset_f (struct GMT_CTRL *GMT, float *data, size_t length, double scale, double offset);
EXTERN_MSC int gmt_grd_layout (struct GMT_CTRL *GMT, struct GMT_GRID_HEADER *h, float *grid, unsigned int complex_mode, unsigned int direction);
EXTERN_MSC void gmt_grd_mux_demux (struct GMT_CTRL *GMT, struct GMT_GRID_HEADER *h, float *data, unsigned int mode);
#endif /* GMT_GRDIO_H */
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