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nrrdEnums.h

/*
  Teem: Tools to process and visualize scientific data and images              
  Copyright (C) 2008, 2007, 2006, 2005  Gordon Kindlmann
  Copyright (C) 2004, 2003, 2002, 2001, 2000, 1999, 1998  University of Utah

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public License
  (LGPL) as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
  The terms of redistributing and/or modifying this software also
  include exceptions to the LGPL that facilitate static linking.

  This library 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.

  You should have received a copy of the GNU Lesser General Public License
  along with this library; if not, write to Free Software Foundation, Inc.,
  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/

#ifndef NRRD_ENUMS_HAS_BEEN_INCLUDED
#define NRRD_ENUMS_HAS_BEEN_INCLUDED

#ifdef __cplusplus
extern "C" {
#endif

/*******
******** NONE of these enums should have values set explicitly in their
******** definition.  The values should simply start at 0 (for Unknown)
******** and increase one integer per value.  The _nrrdCheckEnums()
******** sanity check assumes this, and there is no reason to use 
******** explicit values for any of the enums.
*******/

/*
******** nrrdIoState* enum
** 
** the various things it makes sense to get and set in nrrdIoState struct
** via nrrdIoStateGet and nrrdIoStateSet
*/
enum {
  nrrdIoStateUnknown,
  nrrdIoStateDetachedHeader,
  nrrdIoStateBareText,
  nrrdIoStateCharsPerLine,
  nrrdIoStateValsPerLine,
  nrrdIoStateSkipData,
  nrrdIoStateKeepNrrdDataFileOpen,
  nrrdIoStateZlibLevel,
  nrrdIoStateZlibStrategy,
  nrrdIoStateBzip2BlockSize,
  nrrdIoStateLast
};

/*
******** nrrdFormatType* enum
**
** the different file formats which nrrd supports
*/
enum {
  nrrdFormatTypeUnknown,
  nrrdFormatTypeNRRD,   /* 1: basic nrrd format (associated with any of
                           the magics starting with "NRRD") */
  nrrdFormatTypePNM,    /* 2: PNM image */
  nrrdFormatTypePNG,    /* 3: PNG image */
  nrrdFormatTypeVTK,    /* 4: VTK Structured Points datasets (v1.0 and 2.0) */
  nrrdFormatTypeText,   /* 5: bare ASCII text for 2D arrays */
  nrrdFormatTypeEPS,    /* 6: Encapsulated PostScript (write-only) */
  nrrdFormatTypeLast
};
#define NRRD_FORMAT_TYPE_MAX    6

/*
******** nrrdBoundary* enum
**
** when resampling, how to deal with the ends of a scanline
*/
enum {
  nrrdBoundaryUnknown,
  nrrdBoundaryPad,      /* 1: fill with some user-specified value */
  nrrdBoundaryBleed,    /* 2: copy the last/first value out as needed */
  nrrdBoundaryWrap,     /* 3: wrap-around */
  nrrdBoundaryWeight,   /* 4: normalize the weighting on the existing samples;
                           ONLY sensible for a strictly positive kernel
                           which integrates to unity (as in blurring) */
  nrrdBoundaryLast
};
#define NRRD_BOUNDARY_MAX  4

/*
******** nrrdType* enum
**
** all the different types, identified by integer
**
** 18 July 03: After some consternation, I decided to set
** nrrdTypeUnknown and nrrdTypeDefault to the same thing, with the
** reasoning that the only times that nrrdTypeDefault is used is when
** controlling an *output* type (the type of "nout"), or rather,
** choosing not to control an output type.  As output types must be
** known, there is no confusion between being unset/unknown (invalid)
** and being simply default.
*/
enum {
  nrrdTypeUnknown=0,     /*  0: signifies "type is unset/unknown" */
  nrrdTypeDefault=0,     /*  0: signifies "determine output type for me" */
  nrrdTypeChar,          /*  1:   signed 1-byte integer */
  nrrdTypeUChar,         /*  2: unsigned 1-byte integer */
  nrrdTypeShort,         /*  3:   signed 2-byte integer */
  nrrdTypeUShort,        /*  4: unsigned 2-byte integer */
  nrrdTypeInt,           /*  5:   signed 4-byte integer */
  nrrdTypeUInt,          /*  6: unsigned 4-byte integer */
  nrrdTypeLLong,         /*  7:   signed 8-byte integer */
  nrrdTypeULLong,        /*  8: unsigned 8-byte integer */
  nrrdTypeFloat,         /*  9:          4-byte floating point */
  nrrdTypeDouble,        /* 10:          8-byte floating point */
  nrrdTypeBlock,         /* 11: size user defined at run time; MUST BE LAST */
  nrrdTypeLast
};
#define NRRD_TYPE_MAX       11
#define NRRD_TYPE_SIZE_MAX   8    /* max(sizeof()) over all scalar types */
#define NRRD_TYPE_BIGGEST double  /* this should be a basic C type which
                                     requires for storage the maximum size
                                     of all the basic C types */

/*
******** nrrdEncodingType enum
**
** how data might be encoded into a bytestream
*/
enum {
  nrrdEncodingTypeUnknown,
  nrrdEncodingTypeRaw,      /* 1: same as memory layout (modulo endianness) */
  nrrdEncodingTypeAscii,    /* 2: decimal values are spelled out in ascii */
  nrrdEncodingTypeHex,      /* 3: hexidecimal (two chars per byte) */
  nrrdEncodingTypeGzip,     /* 4: gzip'ed raw data */
  nrrdEncodingTypeBzip2,    /* 5: bzip2'ed raw data */
  nrrdEncodingTypeLast
};
#define NRRD_ENCODING_TYPE_MAX 5

/*
******** nrrdZlibStrategy enum
**
** how gzipped data is compressed
*/
enum {
  nrrdZlibStrategyUnknown,
  nrrdZlibStrategyDefault,   /* 1: default (Huffman + string match) */
  nrrdZlibStrategyHuffman,   /* 2: Huffman only */
  nrrdZlibStrategyFiltered,  /* 3: specialized for filtered data */
  nrrdZlibStrategyLast
};
#define NRRD_ZLIB_STRATEGY_MAX  3

/*
******** nrrdCenter enum
**
** node-centered vs. cell-centered
*/
enum {
  nrrdCenterUnknown,         /* 0: no centering known for this axis */
  nrrdCenterNode,            /* 1: samples at corners of things
                                (how "voxels" are usually imagined)
                                |\______/|\______/|\______/|
                                X        X        X        X   */
  nrrdCenterCell,            /* 2: samples at middles of things
                                (characteristic of histogram bins)
                                 \___|___/\___|___/\___|___/
                                     X        X        X       */
  nrrdCenterLast
};
#define NRRD_CENTER_MAX         2

/*
******** nrrdKind enum
**
** For describing the information along one axis of an array.  This is
** most important for clarifying the representation of non-scalar
** data, in order to distinguish between axes that are genuine image
** domain axes, and axes that exist just to store the multiple
** attributes per sample.  One could argue that this information
** should be per-array and not per-axis, but you still have to
** indicate which one of the axes is the attribute axis.  And, if you
** have, say, the gradient of RGB colors, you want the per-pixel 3x3
** array to have those two attribute axes tagged accordingly.
**
** More of these may be added in the future, such as when nrrd
** supports bricking.  Since nrrd is never going to be in the business
** of manipulating the kind information or supporting kind-specific
** semantics, there can be proliferation of nrrdKinds, provided
** pointless redundancy is avoided.  
**
**  There is a relationship between some of these (nrrdKindSpace is a
** specific nrrdKindDomain), but currently there is no effort to
** record this meta-kind information.
**
** Keep in sync:
**   enumsNrrd.c: nrrdKind airEnum
**        axis.c: nrrdKindSize()
**        axis.c: _nrrdKindAltered()
**
** NOTE: The nrrdKindSize() function returns the valid size for these.
** 
*/
enum {
  nrrdKindUnknown,
  nrrdKindDomain,            /*  1: any image domain */
  nrrdKindSpace,             /*  2: a spatial domain */
  nrrdKindTime,              /*  3: a temporal domain */
  /* -------------------------- end domain kinds */
  /* -------------------------- begin range kinds */
  nrrdKindList,              /*  4: any list of values, non-resample-able */
  nrrdKindPoint,             /*  5: coords of a point */
  nrrdKindVector,            /*  6: coeffs of (contravariant) vector */
  nrrdKindCovariantVector,   /*  7: coeffs of covariant vector (eg gradient) */
  nrrdKindNormal,            /*  8: coeffs of unit-length covariant vector */
  /* -------------------------- end arbitrary size kinds */
  /* -------------------------- begin size-specific kinds */
  nrrdKindStub,              /*  9: axis with one sample (a placeholder) */
  nrrdKindScalar,            /* 10: effectively, same as a stub */
  nrrdKindComplex,           /* 11: real and imaginary components */
  nrrdKind2Vector,           /* 12: 2 component vector */
  nrrdKind3Color,            /* 13: ANY 3-component color value */
  nrrdKindRGBColor,          /* 14: RGB, no colorimetry */
  nrrdKindHSVColor,          /* 15: HSV, no colorimetry */
  nrrdKindXYZColor,          /* 16: perceptual primary colors */
  nrrdKind4Color,            /* 17: ANY 4-component color value */
  nrrdKindRGBAColor,         /* 18: RGBA, no colorimetry */
  nrrdKind3Vector,           /* 19: 3-component vector */
  nrrdKind3Gradient,         /* 20: 3-component covariant vector */
  nrrdKind3Normal,           /* 21: 3-component covector, assumed normalized */
  nrrdKind4Vector,           /* 22: 4-component vector */
  nrrdKindQuaternion,        /* 23: (w,x,y,z), not necessarily normalized */
  nrrdKind2DSymMatrix,       /* 24: Mxx Mxy Myy */
  nrrdKind2DMaskedSymMatrix, /* 25: mask Mxx Mxy Myy */
  nrrdKind2DMatrix,          /* 26: Mxx Mxy Myx Myy */
  nrrdKind2DMaskedMatrix,    /* 27: mask Mxx Mxy Myx Myy */
  nrrdKind3DSymMatrix,       /* 28: Mxx Mxy Mxz Myy Myz Mzz */
  nrrdKind3DMaskedSymMatrix, /* 29: mask Mxx Mxy Mxz Myy Myz Mzz */
  nrrdKind3DMatrix,          /* 30: Mxx Mxy Mxz Myx Myy Myz Mzx Mzy Mzz */
  nrrdKind3DMaskedMatrix,    /* 31: mask Mxx Mxy Mxz Myx Myy Myz Mzx Mzy Mzz */
  nrrdKindLast
};
#define NRRD_KIND_MAX           31

/*
******** nrrdAxisInfo enum
**
** the different pieces of per-axis information recorded in a nrrd
*/
enum {
  nrrdAxisInfoUnknown,
  nrrdAxisInfoSize,                   /*  1: number of samples along axis */
#define NRRD_AXIS_INFO_SIZE_BIT      (1<< 1)
  nrrdAxisInfoSpacing,                /*  2: spacing between samples */
#define NRRD_AXIS_INFO_SPACING_BIT   (1<< 2)
  nrrdAxisInfoThickness,              /*  3: thickness of sample region */
#define NRRD_AXIS_INFO_THICKNESS_BIT (1<< 3)
  nrrdAxisInfoMin,                    /*  4: min pos. assoc. w/ 1st sample */
#define NRRD_AXIS_INFO_MIN_BIT       (1<< 4) 
  nrrdAxisInfoMax,                    /*  5: max pos. assoc. w/ last sample */
#define NRRD_AXIS_INFO_MAX_BIT       (1<< 5)
  nrrdAxisInfoSpaceDirection,         /*  6: inter-sample vector in "space" */
#define NRRD_AXIS_INFO_SPACEDIRECTION_BIT (1<< 6)
  nrrdAxisInfoCenter,                 /*  7: cell vs. node */
#define NRRD_AXIS_INFO_CENTER_BIT    (1<< 7)
  nrrdAxisInfoKind,                   /*  8: from the nrrdKind* enum */
#define NRRD_AXIS_INFO_KIND_BIT      (1<< 8)
  nrrdAxisInfoLabel,                  /*  9: string describing the axis */
#define NRRD_AXIS_INFO_LABEL_BIT     (1<< 9)
  nrrdAxisInfoUnits,                  /* 10: from the nrrdUnit* enum */
#define NRRD_AXIS_INFO_UNITS_BIT     (1<<10)
  nrrdAxisInfoLast
};
#define NRRD_AXIS_INFO_MAX               10
#define NRRD_AXIS_INFO_ALL  \
    ((1<<1)|(1<<2)|(1<<3)|(1<<4)|(1<<5)|(1<<6)|(1<<7)|(1<<8)|(1<<9)|(1<<10))
#define NRRD_AXIS_INFO_NONE 0

/*
******** nrrdBasicInfo enum
**
** the non-per-axis (or per-array) pieces of information that could
** meaningfully be copied between nrrds (hence the void *data is not
** included).
**
** "Basic" is named after the "basic field specifications" described
** in the NRRD file format definition
*/
enum {
  nrrdBasicInfoUnknown,
  nrrdBasicInfoData,                          /*  1 */
#define NRRD_BASIC_INFO_DATA_BIT             (1<< 1)
  nrrdBasicInfoType,                          /*  2 */
#define NRRD_BASIC_INFO_TYPE_BIT             (1<< 2)
  nrrdBasicInfoBlocksize,                     /*  3 */
#define NRRD_BASIC_INFO_BLOCKSIZE_BIT        (1<< 3)
  nrrdBasicInfoDimension,                     /*  4 */
#define NRRD_BASIC_INFO_DIMENSION_BIT        (1<< 4)
  nrrdBasicInfoContent,                       /*  5 */
#define NRRD_BASIC_INFO_CONTENT_BIT          (1<< 5)
  nrrdBasicInfoSampleUnits,                   /*  6 */
#define NRRD_BASIC_INFO_SAMPLEUNITS_BIT      (1<< 6)
  nrrdBasicInfoSpace,                         /*  7 */
#define NRRD_BASIC_INFO_SPACE_BIT            (1<< 7)
  nrrdBasicInfoSpaceDimension,                /*  8 */
#define NRRD_BASIC_INFO_SPACEDIMENSION_BIT   (1<< 8)
  nrrdBasicInfoSpaceUnits,                    /*  9 */
#define NRRD_BASIC_INFO_SPACEUNITS_BIT       (1<< 9)
  nrrdBasicInfoSpaceOrigin,                   /* 10 */
#define NRRD_BASIC_INFO_SPACEORIGIN_BIT      (1<<10)
  nrrdBasicInfoMeasurementFrame,              /* 11 */
#define NRRD_BASIC_INFO_MEASUREMENTFRAME_BIT (1<<11)
  nrrdBasicInfoOldMin,                        /* 12 */
#define NRRD_BASIC_INFO_OLDMIN_BIT           (1<<12)
  nrrdBasicInfoOldMax,                        /* 13 */ 
#define NRRD_BASIC_INFO_OLDMAX_BIT           (1<<13)
  nrrdBasicInfoComments,                      /* 14 */
#define NRRD_BASIC_INFO_COMMENTS_BIT         (1<<14)
  nrrdBasicInfoKeyValuePairs,                 /* 15 */
#define NRRD_BASIC_INFO_KEYVALUEPAIRS_BIT    (1<<15)
  nrrdBasicInfoLast
};
#define NRRD_BASIC_INFO_MAX                      15
#define NRRD_BASIC_INFO_ALL  \
    ((1<<1)|(1<<2)|(1<<3)|(1<<4)|(1<<5)|(1<<6)|(1<<7)|(1<<8)|(1<<9)|(1<<10)\
     |(1<<11)|(1<<12)|(1<<13)|(1<<14)|(1<<15))
#define NRRD_BASIC_INFO_SPACE (NRRD_BASIC_INFO_SPACE_BIT \
                               | NRRD_BASIC_INFO_SPACEDIMENSION_BIT \
                               | NRRD_BASIC_INFO_SPACEUNITS_BIT \
                               | NRRD_BASIC_INFO_SPACEORIGIN_BIT \
                               | NRRD_BASIC_INFO_MEASUREMENTFRAME_BIT)
#define NRRD_BASIC_INFO_NONE 0

/*
** the "endian" enum is actually in the air library, but it is very
** convenient to have it incorporated into the nrrd enum framework for
** the purposes of string<-->int conversion.  Unfortunately, the
** little and big values are 1234 and 4321 respectively, so
** NRRD_ENDIAN_MAX is not actually the highest valid value, but only
** an indicator of how many valid values there are.
*/
#define NRRD_ENDIAN_MAX 2

/*
******** nrrdField enum
**
** the various fields we can parse in a NRRD header
**
** other things which must be kept in sync:
** arraysNrrd.c: 
**    _nrrdFieldValidInImage[]
**    _nrrdFieldOnePerAxis[]
**    _nrrdFieldValidInText[]
**    _nrrdFieldRequired[]
** parseNrrd.c:
**    _nrrdReadNrrdParseInfo[]
** enumsNrrd.c:
**    nrrdField definition
** simple.c:
**    _nrrdFieldCheck[]
** write.c:
**    _nrrdFieldInteresting()
**    _nrrdSprintFieldInfo()
** to some extent, in this file:
**    nrrdAxisInfo and nrrdBasicInfo enums
** axis.c (for per-axis info):
**    _nrrdAxisInfoCopy()
** methodsNrrd.c:
**    lots of functions, but you knew that ...
*/
enum {
  nrrdField_unknown,
  nrrdField_comment,           /*  1 */
  nrrdField_content,           /*  2 */
  nrrdField_number,            /*  3 */
  nrrdField_type,              /*  4 */
  nrrdField_block_size,        /*  5 */
  nrrdField_dimension,         /*  6 */
  nrrdField_space,             /*  7 */
  nrrdField_space_dimension,   /*  8 */
  nrrdField_sizes,             /*  9 ----- begin per-axis ----- */
  nrrdField_spacings,          /* 10 */
  nrrdField_thicknesses,       /* 11 */
  nrrdField_axis_mins,         /* 12 */
  nrrdField_axis_maxs,         /* 13 */
  nrrdField_space_directions,  /* 14 */
  nrrdField_centers,           /* 15 */
  nrrdField_kinds,             /* 16 */
  nrrdField_labels,            /* 17 */
  nrrdField_units,             /* 18 ------ end per-axis ------ */
  nrrdField_min,               /* 19 */
  nrrdField_max,               /* 20 */
  nrrdField_old_min,           /* 21 */
  nrrdField_old_max,           /* 22 */
  nrrdField_endian,            /* 23 */
  nrrdField_encoding,          /* 24 */
  nrrdField_line_skip,         /* 25 */
  nrrdField_byte_skip,         /* 26 */
  nrrdField_keyvalue,          /* 27 */
  nrrdField_sample_units,      /* 28 */
  nrrdField_space_units,       /* 29 */
  nrrdField_space_origin,      /* 30 */
  nrrdField_measurement_frame, /* 31 */
  nrrdField_data_file,         /* 32 */
  nrrdField_last
};
#define NRRD_FIELD_MAX            32

/* 
******** nrrdHasNonExist* enum
**
** oh look, I'm violating my rules outline above for how the enum values
** should be ordered.  The reason for this is that its just too bizarro to
** have the logical value of both nrrdHasNonExistFalse and nrrdHasNonExistTrue
** to be (in C) true.  For instance, nrrdHasNonExist() should be able to 
** return a value from this enum which also functions in a C expressions as
** the expected boolean value.  If for some reason (outide the action of
** nrrdHasNonExist(), nrrdHasNonExistUnknown is interpreted as true, that's
** probably harmlessly conservative.  Time will tell.
*/
enum {
  nrrdHasNonExistFalse,     /* 0: no non-existent values were seen */
  nrrdHasNonExistTrue,      /* 1: some non-existent values were seen */
  nrrdHasNonExistOnly,      /* 2: NOTHING BUT non-existant values were seen */
  nrrdHasNonExistUnknown,   /* 3 */
  nrrdHasNonExistLast
};
#define NRRD_HAS_NON_EXIST_MAX 3

/*
******** nrrdSpace* enum
**
** Identifies the space in which which the origin and direction
** vectors have their coordinates measured.  When a direction is named
** here (like "Left" or "Anterior"), that implies a basis vector that
** points in that direction, along which that coordinate becomes *larger*
** (this is the opposite of MetaIO, for example).
**
** All of these spaces have a well-defined expected dimension, as
** determined by nrrdSpaceDimension(), and setting a nrrd to be in
** such a space, by nrrdSpaceSet(), will automatically set nrrd->spaceDim.
**
** The first six spaces here are PATIENT-ORIENTED spaces, which are
** properly speaking aligned with the patient, and not the scanner
** itself.  But nrrdSpaceScannerXYZ and nrrdSpaceScannerXYZTime are
** DEVICE-ORIENTED spaces, irrespective of the patient, used in a
** previous version of the DICOM standard.  When the two spaces are
** lined up with normal patient orientation in the scanner,
** nrrdSpaceScannerXYZ is the same as nrrdSpaceLeftPosteriorSuperior.
** To quote Part 3 (Information Object Definitions) of the DICOM spec
** (page 275): "If a patient lies parallel to the ground, face-up on
** the table, with his feet-to-head direction same as the
** front-to-back direction of the imaging equipment, the direction of
** the axes of this patient based coordinate system and the equipment
** based coordinate system in previous versions of this Standard will
** coincide."
**
** Keep in sync:
**   enumsNrrd.c: nrrdSpace airEnum
**      simple.c: int nrrdSpaceDimension(int space)
*/
enum {
  nrrdSpaceUnknown,
  nrrdSpaceRightAnteriorSuperior,     /*  1: NIFTI-1 (right-handed) */
  nrrdSpaceLeftAnteriorSuperior,      /*  2: standard Analyze (left-handed) */
  nrrdSpaceLeftPosteriorSuperior,     /*  3: DICOM 3.0 (right-handed) */
  nrrdSpaceRightAnteriorSuperiorTime, /*  4: */
  nrrdSpaceLeftAnteriorSuperiorTime,  /*  5: */
  nrrdSpaceLeftPosteriorSuperiorTime, /*  6: */
  nrrdSpaceScannerXYZ,                /*  7: ACR/NEMA 2.0 (pre-DICOM 3.0) */
  nrrdSpaceScannerXYZTime,            /*  8: */
  nrrdSpace3DRightHanded,             /*  9: */
  nrrdSpace3DLeftHanded,              /* 10: */
  nrrdSpace3DRightHandedTime,         /* 11: */
  nrrdSpace3DLeftHandedTime,          /* 12: */
  nrrdSpaceLast
};
#define NRRD_SPACE_MAX                   12

/*
******** nrrdSpacingStatus* enum
**
** a way of describing how spacing information is known or not known for a 
** given axis, as determined by nrrdSpacingCalculate
*/
enum {
  nrrdSpacingStatusUnknown,           /* 0: nobody knows,
                                         or invalid axis choice */
  nrrdSpacingStatusNone,              /* 1: neither axis->spacing nor
                                         axis->spaceDirection is set */
  nrrdSpacingStatusScalarNoSpace,     /* 2: axis->spacing set,
                                         w/out space info */
  nrrdSpacingStatusScalarWithSpace,   /* 3: axis->spacing set, but there *is*
                                         space info, which means the spacing
                                         does *not* live in the surrounding
                                         space */
  nrrdSpacingStatusDirection,         /* 4: axis->spaceDirection set, and 
                                         measured according to surrounding
                                         space */
  nrrdSpacingStatusLast
};

/*
******** nrrdOriginStatus* enum
**
** how origin information was or was not computed by nrrdOriginCalculate
*/
enum {
  nrrdOriginStatusUnknown,        /* 0: nobody knows, or invalid parms */
  nrrdOriginStatusDirection,      /* 1: chosen axes have spaceDirections */
  nrrdOriginStatusNoMin,          /* 2: axis->min doesn't exist */
  nrrdOriginStatusNoMaxOrSpacing, /* 3: axis->max or ->spacing doesn't exist */
  nrrdOriginStatusOkay,           /* 4: all is well */
  nrrdOriginStatusLast
};

/* ---- BEGIN non-NrrdIO */

/*
******** nrrdMeasure enum
**
** ways to "measure" some portion of the array
** NEEDS TO BE IN SYNC WITH:
** - nrrdMeasure airEnum in enumsNrrd.c
** - nrrdMeasureLine function array in measure.c
*/
enum {
  nrrdMeasureUnknown,
  nrrdMeasureMin,            /* 1: smallest value */
  nrrdMeasureMax,            /* 2: biggest value */
  nrrdMeasureMean,           /* 3: average of values */
  nrrdMeasureMedian,         /* 4: value at 50th percentile */
  nrrdMeasureMode,           /* 5: most common value */
  nrrdMeasureProduct,        /* 6: product of all values */
  nrrdMeasureSum,            /* 7: sum of all values */
  nrrdMeasureL1,             /* 8 */
  nrrdMeasureL2,             /* 9 */
  nrrdMeasureLinf,           /* 10 */
  nrrdMeasureVariance,       /* 11 */
  nrrdMeasureSD,             /* 12: standard deviation */
  nrrdMeasureSkew,           /* 13: skew */
  nrrdMeasureLineSlope,      /* 14: slope of line of best fit */
  nrrdMeasureLineIntercept,  /* 15: y-intercept of line of best fit */
  nrrdMeasureLineError,      /* 16: error of line fitting */
  /* 
  ** the nrrduMeasureHisto... measures interpret the array as a
  ** histogram of some implied value distribution
  */
  nrrdMeasureHistoMin,       /* 17 */
  nrrdMeasureHistoMax,       /* 18 */
  nrrdMeasureHistoMean,      /* 19 */
  nrrdMeasureHistoMedian,    /* 20 */
  nrrdMeasureHistoMode,      /* 21 */
  nrrdMeasureHistoProduct,   /* 22 */
  nrrdMeasureHistoSum,       /* 23 */
  nrrdMeasureHistoL2,        /* 24 */
  nrrdMeasureHistoVariance,  /* 25 */
  nrrdMeasureHistoSD,        /* 26 */
  nrrdMeasureLast
};
#define NRRD_MEASURE_MAX        26
#define NRRD_MEASURE_DESC \
   "Possibilities include:\n " \
   "\b\bo \"min\", \"max\", \"mean\", \"median\", \"mode\", \"variance\", " \
     "\"skew\"\n (self-explanatory)\n " \
   "\b\bo \"intc\", \"slope\", \"error\": " \
     "intercept, slope, and error from line fitting\n " \
   "\b\bo \"sd\": standard deviation\n " \
   "\b\bo \"product\", \"sum\": product or sum of all values\n " \
   "\b\bo \"L1\", \"L2\", \"Linf\": different norms\n " \
   "\b\bo \"histo-min\",  \"histo-max\", \"histo-mean\", " \
     "\"histo-median\", \"histo-mode\", \"histo-product\", \"histo-l2\", " \
     "\"histo-sum\", \"histo-variance\", \"histo-sd\": same measures, " \
     "but for situations " \
     "where we're given not the original values, but a histogram of them."
  

/*
******** nrrdBlind8BitRange
**
** whether or not to blindly say that the range of 8-bit data is
** [0,255] (uchar) or [SCHAR_MIN,SCHAR_MAX] (signed char)
*/
enum {
  nrrdBlind8BitRangeUnknown,   /* 0 */
  nrrdBlind8BitRangeTrue,      /* 1: blindly use the widest extrema (e.g.,
                                  [0-255] for uchar, regardless of what's
                                  really present in the data values */
  nrrdBlind8BitRangeFalse,     /* 2: use the exact value range in the data */
  nrrdBlind8BitRangeState,     /* 3: defer to nrrdStateBlind8BitMinMax */
  nrrdBlind8BitRangeLast
};
#define NRRD_BLIND_8BIT_RANGE_MAX 3
  
/*
******** nrrdUnaryOp enum
**
** for unary operations on nrrds
*/
enum {
  nrrdUnaryOpUnknown,
  nrrdUnaryOpNegative,   /*  1 */
  nrrdUnaryOpReciprocal, /*  2 */
  nrrdUnaryOpSin,        /*  3 */
  nrrdUnaryOpCos,        /*  4 */
  nrrdUnaryOpTan,        /*  5 */
  nrrdUnaryOpAsin,       /*  6 */
  nrrdUnaryOpAcos,       /*  7 */
  nrrdUnaryOpAtan,       /*  8 */
  nrrdUnaryOpExp,        /*  9 */
  nrrdUnaryOpLog,        /* 10 */
  nrrdUnaryOpLog2,       /* 11 */
  nrrdUnaryOpLog10,      /* 12 */
  nrrdUnaryOpLog1p,      /* 13 */
  nrrdUnaryOpSqrt,       /* 14 */
  nrrdUnaryOpCbrt,       /* 15 */
  nrrdUnaryOpErf,        /* 16 */
  nrrdUnaryOpCeil,       /* 17 */
  nrrdUnaryOpFloor,      /* 18 */
  nrrdUnaryOpRoundUp,    /* 19 */
  nrrdUnaryOpRoundDown,  /* 20 */
  nrrdUnaryOpAbs,        /* 21 */
  nrrdUnaryOpSgn,        /* 22 */
  nrrdUnaryOpExists,     /* 23 */
  nrrdUnaryOpRand,       /* 24 */
  nrrdUnaryOpNormalRand, /* 25 */
  nrrdUnaryOpIf,         /* 26 */
  nrrdUnaryOpZero,       /* 27 */
  nrrdUnaryOpOne,        /* 28 */
  nrrdUnaryOpLast
};
#define NRRD_UNARY_OP_MAX   28

/*
******** nrrdBinaryOp enum
**
** for binary operations on nrrds
*/
enum {
  nrrdBinaryOpUnknown,
  nrrdBinaryOpAdd,        /*  1 */
  nrrdBinaryOpSubtract,   /*  2 */
  nrrdBinaryOpMultiply,   /*  3 */
  nrrdBinaryOpDivide,     /*  4 */
  nrrdBinaryOpPow,        /*  5 */
  nrrdBinaryOpSgnPow,     /*  6 */
  nrrdBinaryOpMod,        /*  7 */
  nrrdBinaryOpFmod,       /*  8 */
  nrrdBinaryOpAtan2,      /*  9 */
  nrrdBinaryOpMin,        /* 10 */
  nrrdBinaryOpMax,        /* 11 */
  nrrdBinaryOpLT,         /* 12 */
  nrrdBinaryOpLTE,        /* 13 */
  nrrdBinaryOpGT,         /* 14 */
  nrrdBinaryOpGTE,        /* 15 */
  nrrdBinaryOpCompare,    /* 16 */
  nrrdBinaryOpEqual,      /* 17 */
  nrrdBinaryOpNotEqual,   /* 18 */
  nrrdBinaryOpExists,     /* 19 */
  nrrdBinaryOpIf,         /* 20 */
  nrrdBinaryOpNormalRandScaleAdd, /* 21 */
  nrrdBinaryOpLast
};
#define NRRD_BINARY_OP_MAX   21

/*
******** nrrdTernaryOp
**
** for ternary operations on nrrds
*/
enum {
  nrrdTernaryOpUnknown,
  nrrdTernaryOpAdd,      /*  1 */
  nrrdTernaryOpMultiply, /*  2 */
  nrrdTernaryOpMin,      /*  3 */
  nrrdTernaryOpMax,      /*  4 */
  nrrdTernaryOpClamp,    /*  5 */
  nrrdTernaryOpIfElse,   /*  6 */
  nrrdTernaryOpLerp,     /*  7 */
  nrrdTernaryOpExists,   /*  8 */
  nrrdTernaryOpInOpen,   /*  9 */
  nrrdTernaryOpInClosed, /* 10 */
  nrrdTernaryOpLast
};
#define NRRD_TERNARY_OP_MAX 10

/* ---- END non-NrrdIO */

#ifdef __cplusplus
}
#endif

#endif /* NRRD_ENUMS_HAS_BEEN_INCLUDED */

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