textord/blkocc.h

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#ifndef           BLKOCC_H
#define           BLKOCC_H

#include          "varable.h"
#include          "polyblob.h"
#include          "elst.h"
#include          "notdll.h"
#include          "notdll.h"

class REGION_OCC:public ELIST_LINK
{
  public:
    float min_x;                 //Lowest x in region
    float max_x;                 //Highest x in region
    INT16 region_type;           //Type of crossing

    REGION_OCC() { 
    };                           //constructor used
    //only in COPIER etc
    REGION_OCC(  //constructor
               float min,
               float max,
               INT16 region) {
      min_x = min;
      max_x = max;
      region_type = region;
    }
};

ELISTIZEH (REGION_OCC)
#define RANGE_IN_BAND( band_max, band_min, range_max, range_min ) \
( ((range_min) >= (band_min)) && ((range_max) < (band_max)) ) ? TRUE : FALSE

#define RANGE_OVERLAPS_BAND( band_max, band_min, range_max, range_min ) \
( ((range_max) >= (band_min)) && ((range_min) < (band_max)) ) ? TRUE : FALSE

class BAND
{
  public:
    INT16 max_max;               //upper max
    INT16 max;                   //nominal max
    INT16 min_max;               //lower max
    INT16 max_min;               //upper min
    INT16 min;                   //nominal min
    INT16 min_min;               //lower min

    BAND() { 
    }                            // constructor

    void set(                      // initialise a band
             INT16 new_max_max,    // upper max
             INT16 new_max,        // new nominal max
             INT16 new_min_max,    // new lower max
             INT16 new_max_min,    // new upper min
             INT16 new_min,        // new nominal min
             INT16 new_min_min) {  // new lower min
      max_max = new_max_max;
      max = new_max;
      min_max = new_min_max;
      max_min = new_max_min;
      min = new_min;
      min_min = new_min_min;
    }

    BOOL8 in_minimal(            //in minimal limits?
                     float y) {  //y value
      if ((y >= max_min) && (y < min_max))
        return TRUE;
      else
        return FALSE;
    }

    BOOL8 in_nominal(            //in nominal limits?
                     float y) {  //y value
      if ((y >= min) && (y < max))
        return TRUE;
      else
        return FALSE;
    }

    BOOL8 in_maximal(            //in maximal limits?
                     float y) {  //y value
      if ((y >= min_min) && (y < max_max))
        return TRUE;
      else
        return FALSE;
    }

                                 //overlaps min limits?
    BOOL8 range_overlaps_minimal(float y1,    // one range limit
                                 float y2) {  // other range limit
      if (y1 > y2)
        return RANGE_OVERLAPS_BAND (min_max, max_min, y1, y2);
      else
        return RANGE_OVERLAPS_BAND (min_max, max_min, y2, y1);
    }

                                 //overlaps nom limits?
    BOOL8 range_overlaps_nominal(float y1,    // one range limit
                                 float y2) {  // other range limit
      if (y1 > y2)
        return RANGE_OVERLAPS_BAND (max, min, y1, y2);
      else
        return RANGE_OVERLAPS_BAND (max, min, y2, y1);
    }

                                 //overlaps max limits?
    BOOL8 range_overlaps_maximal(float y1,    // one range limit
                                 float y2) {  // other range limit
      if (y1 > y2)
        return RANGE_OVERLAPS_BAND (max_max, min_min, y1, y2);
      else
        return RANGE_OVERLAPS_BAND (max_max, min_min, y2, y1);
    }

    BOOL8 range_in_minimal(             //within min limits?
                           float y1,    //one range limit
                           float y2) {  //other range limit
      if (y1 > y2)
        return RANGE_IN_BAND (min_max, max_min, y1, y2);
      else
        return RANGE_IN_BAND (min_max, max_min, y2, y1);
    }

    BOOL8 range_in_nominal(             //within nom limits?
                           float y1,    //one range limit
                           float y2) {  //other range limit
      if (y1 > y2)
        return RANGE_IN_BAND (max, min, y1, y2);
      else
        return RANGE_IN_BAND (max, min, y2, y1);
    }

    BOOL8 range_in_maximal(             //within max limits?
                           float y1,    //one range limit
                           float y2) {  //other range limit
      if (y1 > y2)
        return RANGE_IN_BAND (max_max, min_min, y1, y2);
      else
        return RANGE_IN_BAND (max_max, min_min, y2, y1);
    }
};

#define MAX_NUM_BANDS 5

#define UNDEFINED_BAND 99
#define NO_LOWER_LIMIT -9999
#define NO_UPPER_LIMIT 9999

#define DOT_BAND 0

#define END_OF_WERD_CODE 255

extern BOOL_VAR_H (blockocc_show_result, FALSE, "Show intermediate results");
extern INT_VAR_H (blockocc_desc_height, 0,
"Descender height after normalisation");
extern INT_VAR_H (blockocc_asc_height, 255,
"Ascender height after normalisation");
extern INT_VAR_H (blockocc_band_count, 4, "Number of bands used");
extern double_VAR_H (textord_underline_threshold, 0.9,
"Fraction of width occupied");
BOOL8 test_underline(                   //look for underlines
                     BOOL8 testing_on,  //drawing blob
                     PBLOB *blob,       //blob to test
                     float baseline,    //coords of baseline
                     float xheight      //height of line
                    );
BOOL8 test_underline(                   //look for underlines
                     BOOL8 testing_on,  //drawing blob
                     C_BLOB *blob,      //blob to test
                     INT16 baseline,    //coords of baseline
                     INT16 xheight      //height of line
                    );
                                 //project outlines
void horizontal_cblob_projection(C_BLOB *blob,  //blob to project
                                 STATS *stats   //output
                                );
void horizontal_coutline_projection(                     //project outlines
                                    C_OUTLINE *outline,  //outline to project
                                    STATS *stats         //output
                                   );
void set_bands(                 //init from varibles
               float baseline,  //top of bottom band
               float xheight    //height of split band
              );
void block_occ (PBLOB * blob,    //blob to do
float occs[]                     //output histogram
);
                                 //blob to do
void find_transitions(PBLOB *blob, REGION_OCC_LIST *region_occ_list); 
void record_region(  //add region on list
                   INT16 band,
                   float new_min,
                   float new_max,
                   INT16 region_type,
                   REGION_OCC_LIST *region_occ_list);
INT16 find_containing_maximal_band(  //find range's band
                                   float y1,
                                   float y2,
                                   BOOL8 *doubly_contained);
void find_significant_line(POLYPT_IT it, INT16 *band); 
INT16 find_overlapping_minimal_band(  //find range's band
                                    float y1,
                                    float y2);
INT16 find_region_type(INT16 entry_band,
                       INT16 current_band,
                       INT16 exit_band,
                       float entry_x,
                       float exit_x);
void find_trans_point(POLYPT_IT *pt_it,
                      INT16 current_band,
                      INT16 next_band,
                      FCOORD *transition_pt);
void next_region(POLYPT_IT *start_pt_it,
                 INT16 start_band,
                 INT16 *to_band,
                 float *min_x,
                 float *max_x,
                 INT16 *increment,
                 FCOORD *exit_pt);
INT16 find_band(  // find POINT's band
                float y);
void compress_region_list(  // join open regions
                          REGION_OCC_LIST *region_occ_list);
void find_fbox(OUTLINE_IT *out_it,
               float *min_x,
               float *min_y,
               float *max_x,
               float *max_y);
void maintain_limits(float *min_x, float *max_x, float x); 
#endif

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