types.cpp

Ocr source code. provides an Ocr engine that works in C++ language.

/* types.cpp : code for classes (fully) defined in types.h
 * Author: Maxie D. Schmidt (created 5/20/2006)             */

#include "types.h"
#include "classnotes.h"
#include "runutils.h"

xy_point NULL_POINT() {

     xy_point r_val;
     r_val.x = r_val.y = -1;
     return r_val;

}

box_t NULL_BOX() {

     box_t r_val;
     r_val.xy = NULL_POINT();
     return r_val;

}

box_points NULL_PTS() {

     box_points r_val;
     r_val.r_most.x = r_val.r_most.y = -1;
     return r_val;

}

png_file::png_file() {

     is_valid = false;
     filename = "";
     height = width = 0;
     buf = NULL;
     tracks = NULL;
     tracks_num_bytes = 0;
     
     parsed = false;
     scan_starting_line_num = 0;
     plist = NULL;

}

png_file::~png_file() {

     if(buf != NULL) {
          
          free(buf);
          free(tracks);

     }

}

// checks for black pixels or pixels within a range of (r, g, b) = (0, 0, 0);
// the range is: r, g, b <= 100;
bool png_file::grid(int row, int col) {

     if((row >= height) || (col >= width) || (row < 0) || (col < 0))
          return false;
     
     unsigned char *ptr = buf + (row * width * 3) + (col * 3);
     if(within_interval(*ptr, *(ptr + 1), *(ptr + 2), grid_rgb_int))
          return true;
     
     return false;

}

void png_file::mark(int row, int col) {

     if((row >= height) || (row < 0) || (col >= width) || (col < 0))
          return;

     int byte_pos = (row * width + col) % 8;
     unsigned char byte = (0x80 >> byte_pos);
     *(tracks + ((row * width + col) / 8)) = byte |
                                       (*(tracks + ((row * width + col) / 8)));

}

bool png_file::is_marked(int row, int col) {

     if((row >= height) || (row < 0) || (col >= width) || (col < 0))
          return false;

     int byte = *(tracks + ((row * width + col) / 8));
     int byte_pos = (row * width + col) % 8;
     return ((0x80 >> byte_pos) & byte);

}

void png_file::cleanup_tracks() {

     for(int i = 0; i < tracks_num_bytes; i++)
          *(tracks + i) = 0x00;

}