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blkocc.cpp
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/*****************************************************************************
*
* File: blkocc.cpp (Formerly blockocc.c)
* Description: Block Occupancy routines
* Author: Chris Newton
* Created: Fri Nov 8
* Modified:
* Language: C++
* Package: N/A
* Status: Experimental (Do Not Distribute)
*
* (c) Copyright 1991, Hewlett-Packard Company.
** 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.
*
******************************************************************************/
/*
----------------------------------------------------------------------
I n c l u d e s
----------------------------------------------------------------------
*/
#include <ctype.h>
#include <math.h>
#include "errcode.h"
#include "drawtord.h"
#include "blkocc.h"
#include "helpers.h"
double_VAR(textord_underline_threshold, 0.5, "Fraction of width occupied");
// Forward declarations of static functions
static void horizontal_cblob_projection(C_BLOB *blob, // blob to project
STATS *stats); // output
static void horizontal_coutline_projection(C_OUTLINE *outline,
STATS *stats); // output
/**
* test_underline
*
* Check to see if the blob is an underline.
* Return TRUE if it is.
*/
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
) {
inT16 occ;
inT16 blob_width; //width of blob
TBOX blob_box; //bounding box
inT32 desc_occ;
inT32 x_occ;
inT32 asc_occ;
STATS projection;
blob_box = blob->bounding_box ();
blob_width = blob->bounding_box ().width ();
projection.set_range (blob_box.bottom (), blob_box.top () + 1);
if (testing_on) {
// blob->plot(to_win,GOLDENROD,GOLDENROD);
// line_color_index(to_win,GOLDENROD);
// move2d(to_win,blob_box.left(),baseline);
// draw2d(to_win,blob_box.right(),baseline);
// move2d(to_win,blob_box.left(),baseline+xheight);
// draw2d(to_win,blob_box.right(),baseline+xheight);
tprintf
("Testing underline on blob at (%d,%d)->(%d,%d), base=%d\nOccs:",
blob->bounding_box ().left (), blob->bounding_box ().bottom (),
blob->bounding_box ().right (), blob->bounding_box ().top (),
baseline);
}
horizontal_cblob_projection(blob, &projection);
desc_occ = 0;
for (occ = blob_box.bottom (); occ < baseline; occ++)
if (occ <= blob_box.top () && projection.pile_count (occ) > desc_occ)
//max in region
desc_occ = projection.pile_count (occ);
x_occ = 0;
for (occ = baseline; occ <= baseline + xheight; occ++)
if (occ >= blob_box.bottom () && occ <= blob_box.top ()
&& projection.pile_count (occ) > x_occ)
//max in region
x_occ = projection.pile_count (occ);
asc_occ = 0;
for (occ = baseline + xheight + 1; occ <= blob_box.top (); occ++)
if (occ >= blob_box.bottom () && projection.pile_count (occ) > asc_occ)
asc_occ = projection.pile_count (occ);
if (testing_on) {
tprintf ("%d %d %d\n", desc_occ, x_occ, asc_occ);
}
if (desc_occ == 0 && x_occ == 0 && asc_occ == 0) {
tprintf ("Bottom=%d, top=%d, base=%d, x=%d\n",
blob_box.bottom (), blob_box.top (), baseline, xheight);
projection.print();
}
if (desc_occ > x_occ + x_occ
&& desc_occ > blob_width * textord_underline_threshold)
return TRUE; //real underline
if (asc_occ > x_occ + x_occ
&& asc_occ > blob_width * textord_underline_threshold)
return TRUE; //overline
return FALSE; //neither
}
/**
* horizontal_cblob_projection
*
* Compute the horizontal projection of a cblob from its outlines
* and add to the given STATS.
*/
static void horizontal_cblob_projection( //project outlines
C_BLOB *blob, //< blob to project
STATS *stats //< output
) {
//outlines of blob
C_OUTLINE_IT out_it = blob->out_list ();
for (out_it.mark_cycle_pt (); !out_it.cycled_list (); out_it.forward ()) {
horizontal_coutline_projection (out_it.data (), stats);
}
}
/**
* horizontal_coutline_projection
*
* Compute the horizontal projection of a outline from its outlines
* and add to the given STATS.
*/
static void horizontal_coutline_projection( //project outlines
C_OUTLINE *outline, //< outline to project
STATS *stats //< output
) {
ICOORD pos; //current point
ICOORD step; //edge step
inT32 length; //of outline
inT16 stepindex; //current step
C_OUTLINE_IT out_it = outline->child ();
pos = outline->start_pos ();
length = outline->pathlength ();
for (stepindex = 0; stepindex < length; stepindex++) {
step = outline->step (stepindex);
if (step.y () > 0) {
stats->add (pos.y (), pos.x ());
}
else if (step.y () < 0) {
stats->add (pos.y () - 1, -pos.x ());
}
pos += step;
}
for (out_it.mark_cycle_pt (); !out_it.cycled_list (); out_it.forward ()) {
horizontal_coutline_projection (out_it.data (), stats);
}
}