ocrrow.cpp

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/**********************************************************************
 * File:        ocrrow.cpp  (Formerly row.c)
 * Description: Code for the ROW class.
 * Author:      Ray Smith
 *
 * (C) Copyright 1991, Hewlett-Packard Ltd.
 ** Licensed under the Apache License, Version 2.0 (the "License");
 ** you may not use this file except in compliance with the License.
 ** You may obtain a copy of the License at
 ** http://www.apache.org/licenses/LICENSE-2.0
 ** Unless required by applicable law or agreed to in writing, software
 ** distributed under the License is distributed on an "AS IS" BASIS,
 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 ** See the License for the specific language governing permissions and
 ** limitations under the License.
 *
 **********************************************************************/
 
#include "ocrrow.h"
#include "blobbox.h"
 
// Include automatically generated configuration file if running autoconf.
#ifdef HAVE_CONFIG_H
#include "config_auto.h"
#endif
 
ELISTIZE (ROW)
/**********************************************************************
 * ROW::ROW
 *
 * Constructor to build a ROW. Only the stats stuff are given here.
 * The words are added directly.
 **********************************************************************/
ROW::ROW (                       //constructor
int32_t spline_size,               //no of segments
int32_t * xstarts,                 //segment boundaries
double *coeffs,                  //coefficients
float x_height,                  //line height
float ascenders,                 //ascender size
float descenders,                //descender drop
int16_t kern,                      //char gap
int16_t space                      //word gap
)
    : baseline(spline_size, xstarts, coeffs),
      para_(nullptr) {
  kerning = kern;                //just store stuff
  spacing = space;
  xheight = x_height;
  ascrise = ascenders;
  bodysize = 0.0f;
  descdrop = descenders;
  has_drop_cap_ = false;
  lmargin_ = 0;
  rmargin_ = 0;
}
 
 
/**********************************************************************
 * ROW::ROW
 *
 * Constructor to build a ROW. Only the stats stuff are given here.
 * The words are added directly.
 **********************************************************************/
 
ROW::ROW(                 //constructor
         TO_ROW *to_row,  //source row
         int16_t kern,      //char gap
         int16_t space      //word gap
        ) : para_(nullptr) {
  kerning = kern;                //just store stuff
  spacing = space;
  xheight = to_row->xheight;
  bodysize = to_row->body_size;
  ascrise = to_row->ascrise;
  descdrop = to_row->descdrop;
  baseline = to_row->baseline;
  has_drop_cap_ = false;
  lmargin_ = 0;
  rmargin_ = 0;
}
 
// Returns the bounding box including the desired combination of upper and
// lower noise/diacritic elements.
TBOX ROW::restricted_bounding_box(bool upper_dots, bool lower_dots) const {
  TBOX box;
  // This is a read-only iteration of the words in the row.
  WERD_IT it(const_cast<WERD_LIST *>(&words));
  for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
    box += it.data()->restricted_bounding_box(upper_dots, lower_dots);
  }
  return box;
}
 
/**********************************************************************
 * ROW::recalc_bounding_box
 *
 * Set the bounding box correctly
 **********************************************************************/
 
void ROW::recalc_bounding_box() {  //recalculate BB
  WERD *word;                    //current word
  WERD_IT it = &words;           //words of ROW
  int16_t left;                    //of word
  int16_t prev_left;               //old left
 
  if (!it.empty ()) {
    word = it.data ();
    prev_left = word->bounding_box ().left ();
    it.forward ();
    while (!it.at_first ()) {
      word = it.data ();
      left = word->bounding_box ().left ();
      if (left < prev_left) {
        it.move_to_first ();
                                 //words in BB order
        it.sort (word_comparator);
        break;
      }
      prev_left = left;
      it.forward ();
    }
  }
  for (it.mark_cycle_pt (); !it.cycled_list (); it.forward ()) {
    word = it.data ();
    if (it.at_first ())
      word->set_flag (W_BOL, true);
    else
                                 //not start of line
      word->set_flag (W_BOL, false);
    if (it.at_last ())
      word->set_flag(W_EOL, true);
    else
                                 //not end of line
      word->set_flag(W_EOL, false);
                                 //extend BB as reqd
    bound_box += word->bounding_box ();
  }
}
 
 
/**********************************************************************
 * ROW::move
 *
 * Reposition row by vector
 **********************************************************************/
 
void ROW::move(                  // reposition row
               const ICOORD vec  // by vector
              ) {
  WERD_IT it(&words);  // word iterator
 
  for (it.mark_cycle_pt (); !it.cycled_list (); it.forward ())
    it.data ()->move (vec);
 
  bound_box.move (vec);
  baseline.move (vec);
}
 
 
/**********************************************************************
 * ROW::print
 *
 * Display members
 **********************************************************************/
 
void ROW::print(          //print
                FILE *fp  //file to print on
               ) {
  tprintf("Kerning= %d\n", kerning);
  tprintf("Spacing= %d\n", spacing);
  bound_box.print();
  tprintf("Xheight= %f\n", xheight);
  tprintf("Ascrise= %f\n", ascrise);
  tprintf("Descdrop= %f\n", descdrop);
  tprintf("has_drop_cap= %d\n", has_drop_cap_);
  tprintf("lmargin= %d, rmargin= %d\n", lmargin_, rmargin_);
}
 
 
/**********************************************************************
 * ROW::plot
 *
 * Draw the ROW in the given colour.
 **********************************************************************/
 
#ifndef GRAPHICS_DISABLED
void ROW::plot(                //draw it
               ScrollView* window,  //window to draw in
               ScrollView::Color colour   //colour to draw in
              ) {
  WERD *word;                    //current word
  WERD_IT it = &words;           //words of ROW
 
  for (it.mark_cycle_pt (); !it.cycled_list (); it.forward ()) {
    word = it.data ();
    word->plot (window, colour); //all in one colour
  }
}
 
/**********************************************************************
 * ROW::plot
 *
 * Draw the ROW in rainbow colours.
 **********************************************************************/
 
void ROW::plot(               //draw it
               ScrollView* window  //window to draw in
              ) {
  WERD *word;                    //current word
  WERD_IT it = &words;           //words of ROW
 
  for (it.mark_cycle_pt (); !it.cycled_list (); it.forward ()) {
    word = it.data ();
    word->plot (window);         //in rainbow colours
  }
}
#endif  // GRAPHICS_DISABLED
 
/**********************************************************************
 * ROW::operator=
 *
 * Assign rows by duplicating the row structure but NOT the WERDLIST
 **********************************************************************/
 
ROW & ROW::operator= (const ROW & source) {
  this->ELIST_LINK::operator= (source);
  kerning = source.kerning;
  spacing = source.spacing;
  xheight = source.xheight;
  bodysize = source.bodysize;
  ascrise = source.ascrise;
  descdrop = source.descdrop;
  if (!words.empty ())
    words.clear ();
  baseline = source.baseline;    //QSPLINES must do =
  bound_box = source.bound_box;
  has_drop_cap_ = source.has_drop_cap_;
  lmargin_ = source.lmargin_;
  rmargin_ = source.rmargin_;
  para_ = source.para_;
  return *this;
}