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/******************************************************************************
* $Id: northwood.h 21898 2011-03-06 14:27:52Z rouault $
*
* Project: GRC/GRD Reader
* Purpose: Northwood Technologies Grid format declarations
* Author: Perry Casson
*
******************************************************************************
* Copyright (c) 2007, Waypoint Information Technology
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
****************************************************************************/
#ifdef NOT_GDAL
#include <stdio.h>
#define VSILFILE FILE
#define VSIFOpenL fopen
#define VSIFCloseL fclose
#define VSIFSeekL fseek
#define VSIFReadL fread
#else
#include "cpl_vsi.h"
#endif
#ifndef MAX
#define MAX(a, b) (a > b ? a : b)
#endif
#ifndef MIN
#define MIN(a, b) (a < b ? a : b)
#endif
typedef struct
{
int row;
unsigned char *r;
unsigned char *g;
unsigned char *b;
} NWT_RGB_ROW;
typedef struct
{
unsigned char r;
unsigned char g;
unsigned char b;
} NWT_RGB;
typedef struct
{
short h;
short l;
short s;
} HLS;
typedef struct
{
float zVal;
unsigned char r;
unsigned char g;
unsigned char b;
} NWT_INFLECTION;
typedef struct
{
unsigned short usPixVal;
unsigned char res1; // unknown
unsigned char r;
unsigned char g;
unsigned char b;
unsigned char res2; // unknown
unsigned short usLen;
char szClassName[256];
} NWT_CLASSIFIED_ITEM;
typedef struct
{
unsigned int nNumClassifiedItems;
// NWT_CLASSIFIED_ITEM *stClassifedItem[4096]; //hack - it could be up to 64K
NWT_CLASSIFIED_ITEM **stClassifedItem; //hack - it could be up to 64K
} NWT_CLASSIFIED_DICT;
typedef struct
{
char szFileName[256];
VSILFILE *fp;
float fVersion;
unsigned char cFormat; //0x00 16 bit, 0x01 32 bit, 0x80 8 bit classifed, 0x81 16 bit classified
unsigned int nBitsPerPixel;
unsigned int nXSide;
unsigned int nYSide;
double dfStepSize;
double dfMinX;
double dfMaxX;
double dfMinY;
double dfMaxY;
float fZMin;
float fZMax;
float fZMinScale;
float fZMaxScale;
int iZUnits;
char cDescription[32]; //??
char cZUnits[32]; //??
char cMICoordSys[256];
unsigned short iNumColorInflections;
NWT_INFLECTION stInflection[32];
bool bHillShadeExists;
bool bShowGradient;
bool bShowHillShade;
char cHillShadeBrightness;
char cHillShadeContrast;
float fHillShadeAzimuth;
float fHillShadeAngle;
NWT_CLASSIFIED_DICT *stClassDict;
NWT_RGB_ROW stRGBRow;
} NWT_GRID;
int nwt_ParseHeader( NWT_GRID * pGrd, char *nwHeader );
NWT_GRID *nwtOpenGrid( char *filename );
void nwtCloseGrid( NWT_GRID * pGrd );
void nwtPrintGridHeader( NWT_GRID * pGrd );
int nwt_LoadColors( NWT_RGB * pMap, int mapSize, NWT_GRID * pGrd );
void nwt_HillShade( unsigned char *r, unsigned char *g, unsigned char *b,
char *h );
void createIP( int index, unsigned char r, unsigned char g, unsigned char b,
NWT_RGB * map, int *pnWarkerMark );
void linearColor( NWT_RGB * pRGB, NWT_INFLECTION * pIPLow, NWT_INFLECTION * pIPHigh,
float fMid );
#define HLSMAX 1024 /* H,L, and S vary over 0-HLSMAX */
#define RGBMAX 255 /* R,G, and B vary over 0-RGBMAX */
/* HLSMAX BEST IF DIVISIBLE BY 6 */
/* RGBMAX, HLSMAX must each fit in a byte. */
/* Hue is undefined if Saturation is 0 (grey-scale) */
/* This value determines where the Hue scrollbar is */
/* initially set for achromatic colors */
#define UNDEFINED (HLSMAX*2/3)
HLS RGBtoHLS (NWT_RGB rgb);
NWT_RGB HLStoRGB (HLS hls);
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