QTR.h

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/*
 * QTR.h
 *
 * Part of Fly! Legacy project
 *
 * Copyright 2003 Chris Wallace
 *
 * Fly! Legacy is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 * Fly! Legacy 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 *   along with Fly! Legacy; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#ifndef QTR_H
#define QTR_H

typedef struct {
  unsigned short numNodes;
  unsigned long  magic;
  unsigned long  width;
  unsigned long  height;
  unsigned long  rasterBytes;
  short          elev[4];
} SQTRHeader;

#define SIZEOF_QTR_HEADER   24


typedef struct {
  unsigned char   type;
  short           center;
  union {
    struct {
      unsigned short  nwNode;
      unsigned short  neNode;
      unsigned short  swNode;
      unsigned short  seNode;
    } branchData;
    struct {
      short           nwElevation;
      short           neElevation;
      short           swElevation;
      short           seElevation;
    } leafData;
    struct {
      unsigned long offset;
      unsigned long dummy;
    } rasterData;
  };
} SQTRNode;

#define SIZEOF_QTR_NODE     11


#define QTR_NODE_BRANCH     0x00
#define QTR_NODE_LEAF       0x01
#define QTR_NODE_TYPE03     0x03
#define QTR_NODE_RASTER_ABS 0x03
#define QTR_NODE_TYPE85     0x85
#define QTR_NODE_RASTER_REL 0x85

//
// CQTRFile class
//
class CQTRFile {
public:
  CQTRFile (void);
  CQTRFile (int index);
  CQTRFile (const char* qtrFilename);
  ~CQTRFile (void);

  bool           Load (const char* qtrFilename);
  bool           Save (const char* qtrFilename);

  unsigned short NumQuadtreeNodes (void);
  SQTRNode       *GetQuadtreeNode (unsigned short i);
  char           *GetRasterData (unsigned long offset);
  float          ExtractRelativeData (char* data, int x, int z);
  float          ExtractAbsoluteData (short* data, int x, int z);
  float          Search (int level, unsigned short node, int x, int z);
  void           Dump (const char* txtFilename);

public:
  SQTRHeader  header;
  SQTRNode    *qtreenode;
  char        *raster;
};

#endif // QTR_H

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