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/* GNU Ocrad - Optical Character Recognition program
Copyright (C) 2003-2024 Antonio Diaz Diaz.
This program 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.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
struct OCRAD_Pixmap;
class Mask;
class Rational;
class Rectangle;
class Track;
class Transformation;
class Page_image
{
public:
struct Error
{
const char * const msg;
explicit Error( const char * const s ) : msg( s ) {}
};
private:
std::vector< std::vector< uint8_t > > data; // 256 level greymap
uint8_t maxval_, threshold_; // x > threshold == white
static void test_size( const int rows, const int cols );
void read_p1( FILE * const f, const int cols, const bool invert );
void read_p4( FILE * const f, const int cols, const bool invert );
void read_p2( FILE * const f, const int cols, const bool invert );
void read_p5( FILE * const f, const int cols, const bool invert );
void read_p3( FILE * const f, const int cols, const bool invert );
void read_p6( FILE * const f, const int cols, const bool invert );
void read_png( FILE * const f, const int sig_read, const bool invert );
void write_png( FILE * const f, const unsigned bit_depth ) const;
public:
// Create a Page_image from a png, pbm, pgm, or ppm file
Page_image( FILE * const f, const bool invert );
// Create a Page_image from a OCRAD_Pixmap
Page_image( const OCRAD_Pixmap & image, const bool invert );
// Create a reduced Page_image
Page_image( const Page_image & source, const int scale );
bool get_bit( const int row, const int col ) const
{ return data[row][col] <= threshold_; }
bool get_bit( const int row, const int col, const uint8_t th ) const
{ return data[row][col] <= th; }
void set_bit( const int row, const int col, const bool bit )
{ data[row][col] = ( bit ? 0 : maxval_ ); }
int height() const { return data.size(); }
int width() const { return data.empty() ? 0 : data[0].size(); }
uint8_t maxval() const { return maxval_; }
uint8_t threshold() const { return threshold_; }
void threshold( const Rational & th ); // 0 <= th <= 1, else auto
void threshold( const int th ); // 0 <= th <= 255, else auto
bool cut( const Rational ltwh[4] );
void draw_mask( const Mask & m );
void draw_rectangle( const Rectangle & re );
void draw_track( const Track & tr );
bool save( FILE * const f, const char filetype ) const;
bool change_scale( int n );
void transform( const Transformation & t );
};
// defined in png_io.cc
bool read_check_png_sig8( FILE * const f, const int first_byte = -1 );
void show_png_info( FILE * const f, const char * const input_filename,
const int sig_read );
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