githubmirror/tesseract

src/ccstruct/ocrrow.cpp
245 строк7 KB
Stefan Weil
Add const attribute to some functions (API change)
08 апр 2021, 11:43
08 апр 2021, 11:4363f4463
/**********************************************************************
 * 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 automatically generated configuration file if running autoconf.
#ifdef HAVE_CONFIG_H
#  include "config_auto.h"
#endif

#include "blobbox.h"
#include "ocrrow.h"

namespace tesseract {

/**********************************************************************
 * 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
) const {
  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;
}

} // namespace tesseract