gmt_resources.h

/*--------------------------------------------------------------------
 *
 *	Copyright (c) 2012-2020 by the GMT Team (https://www.generic-mapping-tools.org/team.html)
 *	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: www.generic-mapping-tools.org
 *--------------------------------------------------------------------*/
/*
 * gmt_resources.h contains the definitions for the six GMT resources
 * GMT_DATASET, GMT_GRID, GMT_IMAGE, GMT_PALETTE, GMT_POSTSCRIPT
 * as well as the two auxiliary resources GMT_MATRIX and GMT_VECTOR,
 * as well as all named enums.
 *
 * Author:	Paul Wessel
 * Date:	13-JUN-2016
 * Version:	6 API
 */

/*!
 * \file gmt_resources.h
 * \brief Definitions for the GMT resources (GMT_GRID, GMT_DATASET, etc...)
 */

#ifndef GMT_RESOURCES_H
#define GMT_RESOURCES_H

#ifdef DOUBLE_PRECISION_GRID
/* Build GMT using double-precision for grids.  Untested and caveat emptor */
typedef double gmt_grdfloat;
#else
/* GMT default is single-precision grids */
typedef float gmt_grdfloat;
#endif

/*============================================================ */
/*=============== Constants Public Declaration =============== */
/*============================================================ */

/* Here are structure definitions and constants (enums) needed by the
 * public GMT API. Note: As this is C, some structures will contain
 * members we do not disclose in the API documentation but of course
 * the variables are accessible just like the "public" ones.  There
 * is no guarantee that the "private" members cannot change over time.
 */

/*! Session modes for GMT_Create_Session. Do NOT change first 4 as affects GMT.jl */
enum GMT_enum_session {
	GMT_SESSION_NORMAL    = 0,	/* Typical mode to GMT_Create_Session */
	GMT_SESSION_NOEXIT    = 1,	/* Call return and not exit when error */
	GMT_SESSION_EXTERNAL  = 2,	/* Called by an external API (e.g., MATLAB, Python). */
	GMT_SESSION_COLMAJOR  = 4,	/* External API uses column-major formats (e.g., MATLAB, FORTRAN). [Row-major format] */
	GMT_SESSION_LOGERRORS = 8,	/* External API uses column-major formats (e.g., MATLAB, FORTRAN). [Row-major format] */
	GMT_SESSION_RUNMODE   = 16,	/* If set enable GMT's modern runmode. [Classic] */
	GMT_SESSION_NOHISTORY = 32	/* Do not use gmt.history at all [Let modules decide] */
};

/*! Logging settings */
enum GMT_enum_log {
	GMT_LOG_OFF	= 0,	/* Let errors go to stderr [Default] */
	GMT_LOG_ONCE	= 1,	/* Redirect log errors to new source until end of module */
	GMT_LOG_SET	= 2	/* Change log error destination until changed or session ends */
};

/*! Miscellaneous settings */
enum GMT_enum_api {
	GMT_USAGE	= 0,	/* Want to report full program usage message */
	GMT_SYNOPSIS	= 1,	/* Just want the synopsis of usage */
	GMT_PAD_DEFAULT = 2,	/* Default is 2 rows and 2 cols for grid padding */
	GMT_VF_LEN	= 32	/* Bytes needed to hold the @GMTAPI@-* virtual file names */
};

/*! These data primitive identifiers are as follows: */
enum GMT_enum_type {
	GMT_CHAR	=    0,  /* int8_t, 1-byte signed integer type */
	GMT_UCHAR	=    1,  /* uint8_t, 1-byte unsigned integer type */
	GMT_SHORT	=    2,  /* int16_t, 2-byte signed integer type */
	GMT_USHORT	=    3,  /* uint16_t, 2-byte unsigned integer type */
	GMT_INT		=    4,  /* int32_t, 4-byte signed integer type */
	GMT_UINT	=    5,  /* uint32_t, 4-byte unsigned integer type */
	GMT_LONG	=    6,  /* int64_t, 8-byte signed integer type */
	GMT_ULONG	=    7,  /* uint64_t, 8-byte unsigned integer type */
	GMT_FLOAT	=    8,  /* 4-byte data float type */
	GMT_DOUBLE	=    9,  /* 8-byte data float type */
	GMT_TEXT	=   10,  /* Arbitrarily long text string [OGR/GMT use only] */
	GMT_DATETIME	=   11,  /* string with date/time info [OGR/GMT use only] */
	GMT_N_TYPES	=   12,  /* The number of supported data types above */
	GMT_VIA_CHAR	=  100,  /* int8_t, 1-byte signed integer type */
	GMT_VIA_UCHAR	=  200,  /* uint8_t, 1-byte unsigned integer type */
	GMT_VIA_SHORT	=  300,  /* int16_t, 2-byte signed integer type */
	GMT_VIA_USHORT	=  400,  /* uint16_t, 2-byte unsigned integer type */
	GMT_VIA_INT	=  500,  /* int32_t, 4-byte signed integer type */
	GMT_VIA_UINT	=  600,  /* uint32_t, 4-byte unsigned integer type */
	GMT_VIA_LONG	=  700,  /* int64_t, 8-byte signed integer type */
	GMT_VIA_ULONG	=  800,  /* uint64_t, 8-byte unsigned integer type */
	GMT_VIA_FLOAT	=  900,  /* 4-byte data float type */
	GMT_VIA_DOUBLE	= 1000   /* 8-byte data float type */
};

#ifdef DOUBLE_PRECISION_GRID
#define GMT_GRDFLOAT GMT_DOUBLE
#else
#define GMT_GRDFLOAT GMT_FLOAT
#endif

/*! These are the 5 methods for i/o; used as arguments in the API that expects a "method" */

enum GMT_enum_method {
	GMT_IS_FILE	 =    0,	/* Entity is a filename */
	GMT_IS_STREAM	 =    1,	/* Entity is an open stream */
	GMT_IS_FDESC	 =    2,	/* Entity is an open file descriptor */
	GMT_IS_DUPLICATE =   16,	/* Entity is a memory location that should be duplicated */
	GMT_IS_REFERENCE =   32,	/* Entity is a memory location that should be referenced */
	GMT_IS_OUTPUT	 = 1024		/* When creating a resource as a container for output */
};

/* A Grid can come from a grid OR User Matrix, and Data can come from DATASET or via Vectors|Matrix */

enum GMT_enum_via {
	GMT_VIA_NONE		=   0,	/* No via anything */
	GMT_VIA_MODULE_INPUT	=  64,	/* To flag resources destined for another module's "command-line" input */
	GMT_VIA_VECTOR		= 128,	/* A data item masquerading as a vector */
	GMT_VIA_MATRIX		= 256	/* A data item masquerading as a matrix */
};

/* We may allocate just a container, just the data (if container was allocated earlier), or both: */
enum GMT_enum_container {
	GMT_CONTAINER_AND_DATA	= 0U,    /* Create|Read|write both container and the data array */
	GMT_CONTAINER_ONLY	= 1U,    /* Create|read|write the container but no data array */
	GMT_DATA_ONLY		= 2U,   /* Create|Read|write the container's array only */
	GMT_WITH_STRINGS	= 32U,   /* Allocate string array also [DATASET, MATRIX, VECTOR only] */
	GMT_NO_STRINGS		= 0U    /* Do not allocate string array also [Default] */
};

/*! These are the 5 families of data types, + a coordinate array + 3 help containers for vector, matrix, and coordinates */
enum GMT_enum_family {
	GMT_IS_DATASET    = 0,	/* Entity is a data table */
	GMT_IS_GRID       = 1,	/* Entity is a grid */
	GMT_IS_IMAGE      = 2,	/* Entity is a 1- or 3-layer unsigned char image */
	GMT_IS_PALETTE    = 3,	/* Entity is a color palette table */
	GMT_IS_POSTSCRIPT = 4,	/* Entity is a PostScript content struct */
	GMT_IS_MATRIX	  = 5,	/* Entity is user matrix */
	GMT_IS_VECTOR	  = 6,	/* Entity is set of user vectors */
	GMT_IS_COORD	  = 7,	/* Entity is a double coordinate array */
	GMT_N_FAMILIES	  = 8	/* Total number of families [API Developers only]  */
};

#define GMT_IS_CPT	GMT_IS_PALETTE		/* Backwards compatibility for < 5.3.3; */

/*! These are modes for handling comments */
enum GMT_enum_comment {
	GMT_COMMENT_IS_TEXT	= 0,        /* Comment is a text string */
	GMT_COMMENT_IS_OPTION	= 1U,   /* Comment is a linked list of GMT_OPTION structures */
	GMT_COMMENT_IS_COMMAND	= 2U,   /* Comment replaces header->command */
	GMT_COMMENT_IS_REMARK	= 4U,   /* Comment replaces header->remark */
	GMT_COMMENT_IS_TITLE	= 8U,   /* Comment replaces header->title */
	GMT_COMMENT_IS_NAME_X	= 16U,  /* Comment replaces header->x_units [grids only] */
	GMT_COMMENT_IS_NAME_Y	= 32U,  /* Comment replaces header->y_units [grids only] */
	GMT_COMMENT_IS_NAME_Z	= 64U,  /* Comment replaces header->z_units [grids only] */
	GMT_COMMENT_IS_COLNAMES	= 128U, /* Comment replaces header->colnames [tables only] */
	GMT_COMMENT_IS_RESET	= 256U, /* Wipe existing header first [append] */
	GMT_COMMENT_IS_MULTISEG = 512U  /* Comment is in fact a multisegment record */
};

enum GMT_enum_apierr {
	GMT_NOTSET  = -1,	/* When something is not set */
	GMT_NOERROR = 0		/* Return code when all is well */
};

enum GMT_enum_module {
	GMT_MODULE_USAGE		= -9,	/* What GMT_Call_Module returns if told to print usage only */
	GMT_MODULE_SYNOPSIS		= -8,	/* What GMT_Call_Module returns if told to print synopsis only */
	GMT_MODULE_CLASSIC		= -7,	/* mode for GMT_Call_Module to print list of all classic modules */
	GMT_MODULE_LIST			= -6,	/* mode for GMT_Call_Module to print list of all modern modules */
	GMT_MODULE_CLASSIC_CORE	= -5,	/* mode for GMT_Call_Module to print list of all classic modules (core only) */
	GMT_MODULE_LIST_CORE	= -4,	/* mode for GMT_Call_Module to print list of all modern modules (core only) */
	GMT_MODULE_EXIST		= -3,	/* mode for GMT_Call_Module to return 0 if it exists */
	GMT_MODULE_PURPOSE		= -2,	/* mode for GMT_Call_Module to print purpose of module, or all modules */
	GMT_MODULE_OPT			= -1,	/* Gave linked list of option structures to GMT_Call_Module */
	GMT_MODULE_CMD			=  0,	/* Gave an array of text strings (argv[]) to GMT_Call_Module */
	GMT_MODULE_HELP     	 	=  0,	/* Mode for GMT_Show_ModuleInfo to do gmt --help */
	GMT_MODULE_SHOW_MODERN   	=  1,	/* Mode for GMT_Show_ModuleInfo to list all modern modules in gmt --show-modules */
	GMT_MODULE_SHOW_CLASSIC  	=  2,	/* Mode for GMT_Show_ModuleInfo to list all classic modules in gmt --show-classic */
	GMT_MODULE_KEYS  		=  0,	/* Mode for GMT_Get_ModuleInfo to request the module keys */
	GMT_MODULE_GROUP   		=  1	/* Mode for GMT_Get_ModuleInfo to request the module group */
};

/* Array indices for input/output/stderr variables */

enum GMT_enum_std {
	GMT_IN	= 0,	/* stdin */
	GMT_OUT	= 1,	/* stdout */
	GMT_ERR	= 2,	/* stderr */
	GMT_IO	= 2	/* Both input and output */
};

/* There are 3 named columns */
enum GMT_enum_dimensions {
	GMT_X	= 0,	/* x or lon is in 0th column */
	GMT_Y	= 1,	/* y or lat is in 1st column */
	GMT_Z	= 2	/* z is in 2nd column */
};

enum GMT_enum_freg {
	GMT_ADD_FILES_IF_NONE =  1,	/* Tell GMT_Init_IO we conditionally want to register all input files in the option list if nothing else is registered */
	GMT_ADD_FILES_ALWAYS  =  2,	/* Tell GMT_Init_IO to always register all input files in the option list */
	GMT_ADD_STDIO_IF_NONE =  4,	/* Tell GMT_Init_IO we conditionally want to register std(in|out) if nothing else has been registered */
	GMT_ADD_STDIO_ALWAYS  =  8,	/* Tell GMT_Init_IO to always register std(in|out) */
	GMT_ADD_EXISTING      = 16,	/* Tell GMT_Init_IO to only use already registered resources */
	GMT_ADD_DEFAULT       =  6	/* Tell GMT_Init_IO to register files, and if none are found then std(in|out), but only if nothing was registered before this call */
};

/* Three constants for GMT_Get_DataPath modes */
enum GMT_enum_files {
	GMT_FILE_LOCAL        =  0,	/* Tell GMT_Get_DataPath to only consider local files and ignore remote files */
	GMT_FILE_REMOTE       =  1,	/* Tell GMT_Get_DataPath to try to download remote files if given such files (@filename) */
	GMT_FILE_CHECK        =  2,	/* Tell GMT_Get_DataPath to only return error codes but not update the path */
};

enum GMT_enum_ioset {
	GMT_IO_DONE = 0,	/* Tell GMT_End_IO we are done but nothing special is to be done. */
	GMT_IO_ASCII = 512,	/* Force ASCII mode for reading (ignoring current io settings). */
	GMT_IO_RESET = 32768,	/* Tell GMT_End_IO that accessed resources should be made read/write-able again. */
	GMT_IO_UNREG = 16384	/* Tell GMT_End_IO to unregister all accessed resources. */
};

enum GMT_enum_read {
	GMT_READ_NORMAL = 0,	/* Normal read mode [Default] */
	GMT_READ_DATA	= 1,	/* Read ASCII data record and return double array */
	GMT_READ_TEXT	= 2,	/* Read ASCII data record and return text string */
	GMT_READ_MIXED	= 3,	/* Read ASCII data record and return double array but tolerate conversion errors */
	GMT_READ_FILEBREAK = 4	/* Add to mode to indicate we want to know when each file end is reached [continuous] */
};

enum GMT_enum_write {
	GMT_WRITE_DATA = 1,		/* Write double array to output */
	GMT_WRITE_TEXT = 2,		/* Write ASCII current record to output */
	GMT_WRITE_MIXED = 3,		/* Write mixed numerical/text record to output */
	GMT_WRITE_TABLE_HEADER = 4,	/* Write current record as table header to output */
	GMT_WRITE_SEGMENT_HEADER = 8,	/* Write segment header record to output */
	GMT_WRITE_TABLE_START = 16,	/* Write common header block to output (optional title + command line) */
	GMT_WRITE_SET = 0,		/* Write all output tables and all their segments to one destination [Default] */
	GMT_WRITE_OGR = 1,		/* Output OGR/GMT format [Requires proper -a setting] */
	GMT_WRITE_TABLE = 2,		/* Write each output table and all their segments to separate destinations */
	GMT_WRITE_SEGMENT = 3,		/* Write all output tables' segments to separate destinations */
	GMT_WRITE_TABLE_SEGMENT = 4,	/* Same as 2 but if no filenames we use both tbl and seg with format */
	GMT_WRITE_NORMAL = 0,		/* Write header and contents of this entity (table or segment) */
	GMT_WRITE_HEADER = 1,		/* Only write header and not the contents of this entity (table or segment) */
	GMT_WRITE_SKIP = 2,		/* Entirely skip this entity on output (table or segment) */
	GMT_WRITE_NOLF = 32,		/* Do not write LF at end of ASCII record, and not increment output rec number */
	GMT_STRICT_CONVERSION = 1024,	/* Do not convert text to double unless is is viable */
	GMT_LAX_CONVERSION = 2048	/* Convert text to double if at least one field can be converted */
};

enum GMT_enum_header {
	GMT_HEADER_OFF = 0,	/* Disable header blocks out as default */
	GMT_HEADER_ON = 1	/* Enable header blocks out as default */
};

enum GMT_enum_alloc {
	GMT_ALLOC_EXTERNALLY = 0,	/* Allocated outside of GMT: We cannot reallocate or free this memory */
	GMT_ALLOC_INTERNALLY = 1,	/* Allocated by GMT: We may reallocate as needed and free when no longer needed */
	GMT_ALLOC_NORMAL = 0,		/* Normal allocation of new dataset based on shape of input dataset */
	GMT_ALLOC_VERTICAL = 4,		/* Allocate a single table for data set to hold all input tables by vertical concatenation */
	GMT_ALLOC_HORIZONTAL = 8	/* Allocate a single table for data set to hold all input tables by horizontal (paste) concatenations */
};

enum GMT_enum_duplicate {
	GMT_DUPLICATE_NONE  = 0,	/* Duplicate data set structure but no allocate&copy of data records|grid|image */
	GMT_DUPLICATE_ALLOC = 1,	/* Duplicate data set structure and allocate space for data records|grid|image, but no copy */
	GMT_DUPLICATE_DATA  = 2,	/* Duplicate data set structure, allocate space for data records|grid|image, and copy */
	GMT_DUPLICATE_RESET = 4		/* During duplicate, reset copy to normal system grid pad if original is different */
};

/* Various directions and modes to call the FFT */
enum GMT_enum_FFT {
	GMT_FFT_FWD     = 0U,	/* forward Fourier transform */
	GMT_FFT_INV     = 1U,	/* inverse Fourier transform */
	GMT_FFT_REAL    = 0U,	/* real-input FT (currently unsupported) */
	GMT_FFT_COMPLEX = 1U	/* complex-input Fourier transform */
};

/* Various modes to select time in GMT_Message */
enum GMT_enum_time {
	GMT_TIME_NONE    = 0U,	/* Do not report time */
	GMT_TIME_CLOCK   = 1U,	/* Report absolute time formatted via FORMAT_TIME_STAMP */
	GMT_TIME_ELAPSED = 2U,	/* Report elapsed time since last time mark reset */
	GMT_TIME_RESET   = 4U	/* Reset time mark */
};

/* Verbosity levels */
enum GMT_enum_verbose {
	GMT_MSG_QUIET		= 0,   	/* No messages whatsoever */
	GMT_MSG_NOTICE		= 1,	/* Special notices */
	GMT_MSG_ERROR		= 2,	/* Errors only */
	GMT_MSG_WARNING		= 3,	/* Adds warnings */
	GMT_MSG_TICTOC		= 4,	/* Add timings */
	GMT_MSG_INFORMATION	= 5,	/* Adds informational messages */
	GMT_MSG_COMPAT		= 6,	/* Compatibility warnings */
	GMT_MSG_DEBUG		= 7,	/* Debug messages for developers mostly */
	/* For API backwards compatibility only */
	GMT_MSG_NORMAL		= 2,	/* Now GMT_MSG_ERROR */
	GMT_MSG_VERBOSE		= 5,	/* Now GMT_MSG_WARNING  */
	GMT_MSG_LONG_VERBOSE	= 6		/* Now GMT_MSG_INFORMATION */
};

/* GMT_RECORD Declaration */

struct GMT_RECORD {
	double *data;	/* Points to the current record's leading numerical data array (or NULL)*/
	char *text;	/* Points to the start of the current record's trailing text (or NULL); */
};

/*============================================================ */
/*===============+ GMT_GRID Public Declaration =============== */
/*============================================================ */

enum GMT_enum_reg {	/* Public constants for grid registration */
	GMT_GRID_NODE_REG	= 0U,
	GMT_GRID_PIXEL_REG	= 1U,
	GMT_GRID_DEFAULT_REG	= 1024U	/* Means select whatever is implied via -r */
};

enum GMT_enum_gridindex {
        GMT_XLO = 0U,	/* Index for west or xmin value */
        GMT_XHI = 1U,	/* Index for east or xmax value */
        GMT_YLO = 2U,	/* Index for south or ymin value */
        GMT_YHI = 3U,	/* Index for north or ymax value */
        GMT_ZLO = 4U,	/* Index for zmin value */
        GMT_ZHI = 5U	/* Index for zmax value */
};

enum GMT_enum_dimindex {
        GMT_TBL = 0U,	/* Index for number of tables in dimension array */
        GMT_SEG = 1U,	/* Index for number of segments in dimension array */
        GMT_ROW = 2U,	/* Index for number of rows in dimension array */
        GMT_COL = 3U	/* Index for number of columns in dimension array [DATASET only] */
};

enum GMT_enum_gridio {
	GMT_GRID_IS_CARTESIAN	   = 0U,    /* Grid is not geographic but Cartesian */
	GMT_GRID_IS_REAL	   = 0U,    /* Read|write a normal real-valued grid */
	GMT_GRID_IS_COMPLEX_REAL   = 4U,    /* Read|write the real component to/from a complex grid */
	GMT_GRID_IS_COMPLEX_IMAG   = 8U,    /* Read|write the imaginary component to/from a complex grid */
	GMT_GRID_IS_COMPLEX_MASK   = 12U,   /* To mask out the real|imag flags */
	GMT_GRID_NO_HEADER	   = 16U,   /* Write a native grid without the leading grid header */
	GMT_GRID_ROW_BY_ROW	   = 32U,   /* Read|write the grid array one row at the time sequentially */
	GMT_GRID_ROW_BY_ROW_MANUAL = 64U,   /* Read|write the grid array one row at the time in any order */
	GMT_GRID_XY		   = 128U,  /* Allocate and initialize x,y vectors */
	GMT_GRID_IS_GEO		   = 256U,  /* Grid is a geographic grid, not Cartesian */
	GMT_GRID_IS_IMAGE	   = 512U,   /* Grid may be an image, only allowed with GMT_CONTAINER_ONLY */
	GMT_IMAGE_NO_INDEX	   = 4096,	/* If reading an indexed grid, convert to rgb so we can interpolate */
	GMT_IMAGE_ALPHA_LAYER  = 8192	/* Place any alpha layer in the image band, not alpha array */
};

#define GMT_GRID_ALL		0U   /* Backwards compatibility for < 5.3.3; See GMT_CONTAINER_AND_DATA */
#define GMT_GRID_HEADER_ONLY	1U   /* Backwards compatibility for < 5.3.3; See GMT_CONTAINER_ONLY */
#define GMT_GRID_DATA_ONLY	2U   /* Backwards compatibility for < 5.3.3; See GMT_DATA_ONLY */

/* These lengths (except GMT_GRID_VARNAME_LEN80) must NOT be changed as they are part of grd definition */
enum GMT_enum_grdlen {
	GMT_GRID_UNIT_LEN80     = 80U,
	GMT_GRID_TITLE_LEN80    = 80U,
	GMT_GRID_VARNAME_LEN80  = 80U,
	GMT_GRID_COMMAND_LEN320 = 320U,
	GMT_GRID_REMARK_LEN160  = 160U,
	GMT_GRID_NAME_LEN256	= 256U,
	GMT_GRID_HEADER_SIZE    = 892U
};

/* Note: GMT_GRID_HEADER_SIZE is 4 less than sizeof (struct GMT_GRID_HEADER) on
 * 64 bit systems due to alignment.  Since the GMT_GRID_HEADER was designed
 * during the 32-bit era its size in files is 892.  For backwards compatibility
 * we continue to enforce this header size by writing the structure components
 * separately. */

struct GMT_GRID_HEADER {
	/* Variables we document for the API:
	 * == Do not change the type of the following three items.
	 * == They are copied verbatim to any native grid header and must be 4-byte unsigned integers. */
	uint32_t n_columns;              /* Number of columns */
	uint32_t n_rows;                 /* Number of rows */
	uint32_t registration;           /* GMT_GRID_NODE_REG (0) for node grids, GMT_GRID_PIXEL_REG (1) for pixel grids */

	/* -- Here is the possible location for data structure padding:
	 *    A double is 8-byte aligned on Windows. */

	/* == The types of the following 12 elements must not be changed.
	 * == They are also copied verbatim to the native grid header. */
	double wesn[4];                        /* Min/max x and y coordinates */
	double z_min;                          /* Minimum z value */
	double z_max;                          /* Maximum z value */
	double inc[2];                         /* x and y increment */
	double z_scale_factor;                 /* grid values must be multiplied by this */
	double z_add_offset;                   /* After scaling, add this */
	char x_units[GMT_GRID_UNIT_LEN80];     /* units in x-direction */
	char y_units[GMT_GRID_UNIT_LEN80];     /* units in y-direction */
	char z_units[GMT_GRID_UNIT_LEN80];     /* grid value units */
	char title[GMT_GRID_TITLE_LEN80];      /* name of data set */
	char command[GMT_GRID_COMMAND_LEN320]; /* name of generating command */
	char remark[GMT_GRID_REMARK_LEN160];   /* comments re this data set */

	/* Items not stored in the data file for grids but explicitly used in macros computing node numbers */
	uint32_t n_layers;                     /* Number of layers in a 3-D data cube [1] */
	size_t nm;                             /* Number of data items in this grid (n_columns * n_rows) [padding is excluded] */
	size_t size;                           /* Actual number of items (not bytes) required to hold this grid (= mx * my) */
	unsigned int bits;                     /* Bits per data value (e.g., 32 for ints/floats; 8 for bytes) */
	unsigned int complex_mode;             /* 0 = normal, GMT_GRID_IS_COMPLEX_REAL = real part of complex grid, GMT_GRID_IS_COMPLEX_IMAG = imag part of complex grid */
	unsigned int type;                     /* Grid format */
	unsigned int l_type;                   /* Layer dimension data type */
	unsigned int n_bands;                  /* Number of bands [1]. Used with IMAGE containers and macros to get ij index from row,col, band */
	unsigned int mx, my;                   /* Actual dimensions of the grid in memory, allowing for the padding */
	unsigned int pad[4];                   /* Padding on west, east, south, north sides [2,2,2,2] */
	char l_units[GMT_GRID_UNIT_LEN80];     /* Name/units for the layer dimension */
	char mem_layout[4];                    /* Three or Four char codes T|B R|C S|R|S (grd) or B|L|P + A|a (img) describing array layout in mem and interleaving */
	gmt_grdfloat  nan_value;               /* Missing value as stored in grid file */
	double xy_off;                         /* 0.0 (registration == GMT_GRID_NODE_REG) or 0.5 ( == GMT_GRID_PIXEL_REG) */
	double *layer;                         /* Array with layer levels for 3-D cubes [NULL] */
	char *ProjRefPROJ4;                    /* To store a referencing system string in PROJ.4 format */
	char *ProjRefWKT;                      /* To store a referencing system string in WKT format */
	int ProjRefEPSG;                       /* To store a referencing system EPSG code */
	void *hidden;                          /* Lower-level information for GMT use only */
};

/* grd is stored in rows going from west (xmin) to east (xmax)
 * first row in file has yvalue = north (ymax).
 * This is SCANLINE orientation.*/

/*-----------------------------------------------------------------------------------------
 *	Notes on registration:

	Assume x_min = y_min = 0 and x_max = y_max = 10 and x_inc = y_inc = 1.
	For a normal node grid we have:
		(1) n_columns = (x_max - x_min) / x_inc + 1 = 11
		    n_rows = (y_max - y_min) / y_inc + 1 = 11
		(2) node # 0 is at (x,y) = (x_min, y_max) = (0,10) and represents the surface
		    value in a box with dimensions (1,1) centered on the node.
	For a pixel grid we have:
		(1) n_columns = (x_max - x_min) / x_inc = 10
		    n_rows = (y_max - y_min) / y_inc = 10
		(2) node # 0 is at (x,y) = (x_min + 0.5*x_inc, y_max - 0.5*y_inc) = (0.5, 9.5)
		    and represents the surface value in a box with dimensions (1,1)
		    centered on the node.
-------------------------------------------------------------------------------------------*/

struct GMT_GRID {	/* To hold a GMT gmt_grdfloat grid and its header in one container */
	struct GMT_GRID_HEADER *header;	/* Pointer to full GMT header for the grid */
	gmt_grdfloat *data;             /* Pointer to the gmt_grdfloat grid */
	double *x, *y;                  /* Vector of coordinates */
	void *hidden;                   /* Row-by-row machinery information [NULL] */
};

/*============================================================ */
/*============== GMT_DATASET Public Declaration ============== */
/*============================================================ */

/* GIS geometries, with GMT_IS_NONE as 16 for no such thing */
enum GMT_enum_geometry {
	GMT_IS_POINT	= 1U,
	GMT_IS_LINE	= 2U,
	GMT_IS_POLY	= 4U,
	GMT_IS_LP	= 6U,	/* Could be any one of LINE or POLY */
	GMT_IS_PLP	= 7U,	/* Could be any one of POINT, LINE, POLY */
	GMT_IS_SURFACE	= 8U,
	GMT_IS_NONE	= 16U,	/* Non-geographical items like color palettes */
	GMT_IS_TEXT	= 32U	/* Text strings which triggers ASCII text reading */
};

/* These are two polygon modes */
enum GMT_enum_pol {
	GMT_IS_PERIMETER =  0,
	GMT_IS_HOLE      = 1U
};

/* Modes for setting columns for rec-by-rec input/output */
enum GMT_enum_columns {
	GMT_COL_FIX = 0,		/* Specify fixed numerical columns to read, anything beyond is considered trailing text */
	GMT_COL_ADD = 1,		/* Add to current number of columns */
	GMT_COL_SUB = 2,		/* Subtract from current number of columns */
	GMT_COL_VAR = 3,		/* Input ASCII records have variable number of columns */
	GMT_COL_FIX_NO_TEXT = 4		/* Specify fixed numerical columns to read, skip any trailing text */
};

/* Return codes for GMT_Get_Record: */

enum GMT_enum_ascii_input_return {	/* Bit flag related to record i/o */
	GMT_IO_DATA_RECORD    =  0,		/* Read a data record and had no issues */
	GMT_IO_TABLE_HEADER   =  1U,	/* Read a table header */
	GMT_IO_SEGMENT_HEADER =  2U,	/* Read a segment header */
	GMT_IO_ANY_HEADER     =  3U,	/* Read either table or segment header */
	GMT_IO_MISMATCH       =  4U,	/* Read incorrect number of columns */
	GMT_IO_EOF            =  8U,	/* Read end-of-file */
	GMT_IO_NAN            = 16U,	/* Read a NaN record */
	GMT_IO_NEW_SEGMENT    = 18U,	/* Read either segment header or NaN-record */
	GMT_IO_GAP            = 32U,	/* Determined a gap should occur before this record */
	GMT_IO_LINE_BREAK     = 58U,	/* Segment break caused by seg header, gap, nan, or EOF */
	GMT_IO_NEXT_FILE      = 64U	/* Like EOF except for an individual file (with more files to follow) */
};

/* Here are the GMT data types used for tables */

struct GMT_DATASEGMENT {    /* For holding segment lines in memory */
	/* Variables we document for the API: */
	uint64_t n_rows;        /* Number of points in this segment */
	uint64_t n_columns;     /* Number of fields in each record (>= 2) */
	double *min;            /* Minimum coordinate for each column */
	double *max;            /* Maximum coordinate for each column */
	double **data;          /* Data x,y, and possibly other columns */
	char *label;            /* Label string (if applicable) */
	char *header;           /* Segment header (if applicable) */
	char **text;            /* text beyond the data */
	void *hidden;		/* Book-keeping variables "hidden" from the API */
};

struct GMT_DATATABLE {	/* To hold an array of line segment structures and header information in one container */
	/* Variables we document for the API: */
	unsigned int n_headers; /* Number of file header records (0 if no header) */
	uint64_t n_columns;     /* Number of columns (fields) in each record */
	uint64_t n_segments;    /* Number of segments in the array */
	uint64_t n_records;     /* Total number of data records across all segments */
	double *min;            /* Minimum coordinate for each column */
	double *max;            /* Maximum coordinate for each column */
	char **header;          /* Array with all file header records, if any) */
	struct GMT_DATASEGMENT **segment;	/* Pointer to array of segments */
	void *hidden;		/* Book-keeping variables "hidden" from the API */
};

/* The main GMT Data Containers used in the API: */

struct GMT_DATASET {	/* Single container for an array of GMT tables (files) */
	/* Variables we document for the API: */
	uint64_t n_tables;		/* The total number of tables (files) contained */
	uint64_t n_columns;		/* The number of data columns */
	uint64_t n_segments;		/* The total number of segments across all tables */
	uint64_t n_records;		/* The total number of data records across all tables */
	double *min;			/* Minimum coordinate for each column */
	double *max;			/* Maximum coordinate for each column */
	struct GMT_DATATABLE **table;	/* Pointer to array of tables */
	enum GMT_enum_read type;	/* The datatype (numerical, text, or mixed) of this dataset */
	enum GMT_enum_geometry geometry;/* The geometry of this dataset */
	char *ProjRefPROJ4;             /* To store a referencing system string in PROJ.4 format */
	char *ProjRefWKT;               /* To store a referencing system string in WKT format */
	int ProjRefEPSG;                /* To store a referencing system EPSG code */
	void *hidden;			/* Book-keeping variables "hidden" from the API */
};

/*============================================================ */
/*============== GMT_PALETTE Public Declaration ============== */
/*============================================================ */

enum GMT_enum_color {
	GMT_RGB			= 0,
	GMT_CMYK		= 1,
	GMT_HSV			= 2,
	GMT_COLORINT		= 4,
	GMT_NO_COLORNAMES	= 8
};

enum GMT_enum_bfn {
	GMT_BGD = 0,
	GMT_FGD = 1,
	GMT_NAN = 2
};

enum GMT_enum_cpt {
	GMT_CPT_REQUIRED = 0,
	GMT_CPT_OPTIONAL = 1
};

enum GMT_enum_cptflags {
	GMT_CPT_NO_BNF     = 1,
	GMT_CPT_EXTEND_BNF = 2,
	GMT_CPT_HARD_HINGE = 4,
	GMT_CPT_SOFT_HINGE = 8,
	GMT_CPT_TIME       = 16,
	GMT_CPT_COLORLIST  = 32,
	GMT_CPT_HINGED     = 4	/* Backwards compatibility with 6.0 API */
};

/* Here is the definition of the GMT_PALETTE structure that is used in programs
 * that deals with coloring of items as a function of z-lookup.  Note that rgb
 * arrays have 4 items as the 4th value could be a non-zero transparency (when supported).
 */

struct GMT_LUT {
	double z_low, z_high, i_dz;
	double rgb_low[4], rgb_high[4], rgb_diff[4];
	double hsv_low[4], hsv_high[4], hsv_diff[4];
	unsigned int annot;	/* 1 for Lower, 2 for Upper, 3 for Both */
	unsigned int skip;	/* true means skip this slice */
	struct GMT_FILL *fill;	/* For patterns instead of color */
	char *label;		/* For non-number labels */
	char *key;		/* For non-number categories */
};

struct GMT_BFN {		/* For back-, fore-, and nan-colors */
	double rgb[4];		/* Red, green, blue, and alpha */
	double hsv[4];		/* Hue, saturation, value, alpha */
	unsigned int skip;	/* true means skip this slice */
	struct GMT_FILL *fill;	/* For patterns instead of color */
};

struct GMT_PALETTE {		/* Holds all pen, color, and fill-related parameters */
	/* Variables we document for the API: */
	struct GMT_LUT *data;		/* CPT lookup table read by gmtlib_read_cpt */
	struct GMT_BFN bfn[3];		/* Structures with back/fore/nan colors */
	unsigned int n_headers;		/* Number of CPT header records (0 if no header) */
	unsigned int n_colors;		/* Number of colors in CPT lookup table */
	unsigned int mode;		/* Flags controlling use of BFN colors */
	unsigned int model;		/* RGB, HSV, CMYK */
	unsigned int is_wrapping;	/* If 1 then we must wrap around to find color - can never be F or B */
	unsigned int is_gray;		/* 1 if only grayshades are needed */
	unsigned int is_bw;		/* 1 if only black and white are needed */
	unsigned int is_continuous;	/* 1 if continuous color tables have been given */
	unsigned int has_pattern;	/* 1 if CPT contains any patterns */
	unsigned int has_hinge;		/* 1 if CPT is hinged at hinge (below) */
	unsigned int has_range;		/* 1 if CPT has a natural range (minmax below) */
	unsigned int categorical;	/* 1 if CPT applies to categorical data, and 2 if key is a string */
	double minmax[2];		/* Min/max z-value for a default range, if given */
	double hinge;			/* z-value for hinged CPTs */
	double wrap_length;		/* z-length of active CPT */
	char **header;			/* Array with all CPT header records, if any) */		/* Content not counted by sizeof (struct) */
	void *hidden;			/* Book-keeping variables "hidden" from the API */
};

/*============================================================ */
/*=============== GMT_IMAGE Public Declaration =============== */
/*============================================================ */

/* The GMT_IMAGE container is used to pass user images in from the GDAL bridge */

struct GMT_IMAGE {	/* Single container for a user image of data */
	/* Variables we document for the API: */
	enum GMT_enum_type type;        /* Data type, e.g. GMT_FLOAT */
	int *colormap;                  /* Array with color lookup values */
	int n_indexed_colors;           /* Number of colors in a paletted image */
	struct GMT_GRID_HEADER *header; /* Pointer to full GMT header for the image */
	unsigned char *data;            /* Pointer to actual image */
	unsigned char *alpha;           /* Pointer to an optional transparency layer stored in a separate variable */
	const char *color_interp;
	double *x, *y;                  /* Vector of coordinates */
	void *hidden;			/* Book-keeping variables "hidden" from the API */
};

/*==================================================================== */
/*================= GMT_POSTSCRIPT Public Declaration ================ */
/*==================================================================== */

/* The GMT_POSTSCRIPT container is used to pass PostScript objects */

enum GMT_enum_ps {
	GMT_PS_EMPTY    = 0,
	GMT_PS_HEADER   = 1,
	GMT_PS_TRAILER  = 2,
	GMT_PS_COMPLETE = 3
};

struct GMT_POSTSCRIPT {	/* Single container for a chunk of PostScript */
	/* Variables we document for the API: */
	size_t n_bytes;             /* Length of data array */
	unsigned int mode;          /* GMT_PS_HEADER = Has header, GMT_PS_TRAILER = Has trailer, GMT_PS_COMPLETE = Has both */
	unsigned int n_headers;     /* Number of PS header records (0 if no header) */
	char *data;		    /* Pointer to actual PS text */
	char **header;		    /* Array with all PS header records, if any) */		/* Content not counted by sizeof (struct) */
	void *hidden;		/* Book-keeping variables "hidden" from the API */
};

/*============================================================ */
/*============= GMT_UNIVECTOR Public Declaration ============= */
/*============================================================ */

/* This union is used to hold any type of array */
union GMT_UNIVECTOR {
	/* Universal vector of any data type can be held here */
	uint8_t  *uc1; /* Unsigned 1-byte int */
	int8_t   *sc1; /* Signed 1-byte int */
	uint16_t *ui2; /* Unsigned 2-byte int */
	int16_t  *si2; /* Signed 2-byte int */
	uint32_t *ui4; /* Unsigned 4-byte int */
	int32_t  *si4; /* Signed 4-byte int */
	uint64_t *ui8; /* Unsigned 8-byte int */
	int64_t  *si8; /* Signed 8-byte int */
	float    *f4;  /* 4-byte float */
	double   *f8;  /* 8-byte float */
};

/*============================================================ */
/*=============== GMT_VECTOR Public Declaration ============== */
/*============================================================ */

struct GMT_VECTOR {	/* Single container for user vector(s) of data */
	/* Variables we document for the API: */
	uint64_t n_columns;		/* Number of vectors */
	uint64_t n_rows;		/* Number of rows in each vector */
	unsigned int n_headers;		/* Number of CPT header records (0 if no header) */
	enum GMT_enum_reg registration;	/* 0 for gridline and 1 for pixel registration  */
	enum GMT_enum_type *type;	/* Array of data types (type of each uni-vector, e.g. GMT_FLOAT */
	double range[2];		/* Contains tmin/tmax (or 0/0 if not equidistant) */
	union GMT_UNIVECTOR *data;	/* Array of uni-vectors */
	char **text;			/* Pointer to optional array of strings [NULL] */
	char command[GMT_GRID_COMMAND_LEN320]; /* name of generating command */
	char remark[GMT_GRID_REMARK_LEN160];   /* comments re this data set */
	char **header;		        /* Array with all Vector header records, if any) */		/* Content not counted by sizeof (struct) */
	char *ProjRefPROJ4;             /* To store a referencing system string in PROJ.4 format */
	char *ProjRefWKT;               /* To store a referencing system string in WKT format */
	int ProjRefEPSG;                /* To store a referencing system EPSG code */
	void *hidden;			/* Book-keeping variables "hidden" from the API */
};

/*============================================================ */
/*=============== GMT_MATRIX Public Declaration ============== */
/*============================================================ */

enum GMT_enum_fmt {
	GMT_IS_ROW_FORMAT	= 1,	/* 2-D grid is C-style with rows: as index increase we move across rows */
	GMT_IS_COL_FORMAT	= 2	/* 2-D grid is Fortran-style with columns: as index increase we move down columns  */
};

/* These containers are used to pass user vectors and matrices in/out of GMT */

struct GMT_MATRIX {	/* Single container for a user matrix of data */
	/* Variables we document for the API: */
	uint64_t n_rows;		/* Number of rows in this matrix */
	uint64_t n_columns;		/* Number of columns in this matrix */
	uint64_t n_layers;		/* Number of layers in a 3-D matrix [1] */
	unsigned int n_headers;		/* Number of CPT header records (0 if no header) */
	enum GMT_enum_fmt shape;	/* 0 = C (rows) and 1 = Fortran (cols) */
	enum GMT_enum_reg registration;	/* 0 for gridline and 1 for pixel registration  */
	size_t dim;			/* Allocated length of longest C or Fortran dim */
	size_t size;			/* Byte length of data */
	enum GMT_enum_type type;	/* Data type, e.g. GMT_FLOAT */
	double range[6];		/* Contains xmin/xmax/ymin/ymax[/zmin/zmax] */
	double inc[3];			/* Contains xinc/yinc[/zinc] */
	union GMT_UNIVECTOR data;	/* Union with pointer to actual matrix of the chosen type */
	char **text;			/* Pointer to optional array of strings [NULL] */
	char command[GMT_GRID_COMMAND_LEN320]; /* name of generating command */
	char remark[GMT_GRID_REMARK_LEN160];   /* comments re this data set */
	char **header;		        /* Array with all Matrix header records, if any) */		/* Content not counted by sizeof (struct) */
	char *ProjRefPROJ4;             /* To store a referencing system string in PROJ.4 format */
	char *ProjRefWKT;               /* To store a referencing system string in WKT format */
	int ProjRefEPSG;                /* To store a referencing system EPSG code */
	void *hidden;			/* Book-keeping variables "hidden" from the API */
};

/*============================================================ */
/*=============== GMT_OPTION Public Declaration ============== */
/*============================================================ */

enum GMT_enum_opt {
	GMT_OPT_USAGE =     '?',	/* Command-line option for full usage */
	GMT_OPT_SYNOPSIS =  '^',	/* Command-line option for synopsis */
	GMT_OPT_PARAMETER = '-',	/* Command-line option for GMT defaults parameter */
	GMT_OPT_INFILE =    '<',	/* Command-line option for input file */
	GMT_OPT_OUTFILE =   '>'		/* Command-line option for output file */
};

/* This struct is used to pass program options in/out of GMT modules */

struct GMT_OPTION {              /* Structure for a single GMT command option */
	char option;                 /* 1-char command line -<option> (e.g. D in -D) identifying the option (* if file) */
	char *arg;                   /* If not NULL, contains the argument for this option */
	struct GMT_OPTION *next;     /* Pointer to next option in a linked list */
	struct GMT_OPTION *previous; /* Pointer to previous option in a linked list */
};

/*============================================================ */
/*  struct GMT_RESOURCE is for API Developers only   ========= */
/*============================================================ */

struct GMT_RESOURCE {	/* Information related to passing resources between GMT and external APIs */
	enum GMT_enum_family family;	/* GMT data family, i.e., GMT_IS_DATASET, GMT_IS_GRID, etc. */
	enum GMT_enum_geometry geometry;/* One of the recognized GMT geometries */
	enum GMT_enum_std direction;	/* Either GMT_IN or GMT_OUT */
	struct GMT_OPTION *option;	/* Pointer to the corresponding module option */
	char name[GMT_VF_LEN];		/* Virtual file name for resource */
	int pos;			/* Corresponding index into external object in|out arrays */
	int mode;			/* Either primary (0) or secondary (1) resource */
	void *object;			/* Pointer to the actual GMT object */
};

/*============================================================ */
/*  struct GMT_MODULEINFO is for supplement Developers only == */
/*============================================================ */

/* Shared library structure: name (classic and modern), library, purpose, keys for each module */
struct GMT_MODULEINFO {
	const char *mname;            /* Program (modern) name */
	const char *cname;            /* Program (classic) name */
	const char *component;        /* Component (core, supplement, custom) */
	const char *purpose;          /* Program purpose */
	const char *keys;             /* Program option info for external APIs */
};

#endif /* GMT_RESOURCES_H */