2012-09-04 15:33:15 +00:00
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/*
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2013-04-06 15:51:33 +00:00
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* HTMLTextLine.cc
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2012-09-04 15:33:15 +00:00
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*
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* Generate and optimized HTML for one line
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*
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2013-02-05 06:36:36 +00:00
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* Copyright (C) 2012,2013 Lu Wang <coolwanglu@gmail.com>
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2012-09-04 15:33:15 +00:00
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*/
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2013-03-21 04:18:26 +00:00
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#include <cmath>
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2013-03-20 15:46:58 +00:00
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#include <algorithm>
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2012-09-05 07:13:21 +00:00
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2013-04-06 15:51:33 +00:00
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#include "HTMLTextLine.h"
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2013-04-06 08:45:01 +00:00
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2013-02-15 05:07:00 +00:00
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#include "util/encoding.h"
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2013-04-06 16:42:54 +00:00
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#include "util/css_const.h"
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2012-09-04 15:33:15 +00:00
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2012-09-12 15:26:14 +00:00
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namespace pdf2htmlEX {
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2012-09-04 15:33:15 +00:00
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using std::min;
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using std::max;
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2012-09-05 07:13:21 +00:00
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using std::vector;
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2012-09-10 17:53:33 +00:00
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using std::ostream;
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2012-11-29 10:28:07 +00:00
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using std::cerr;
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using std::endl;
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2013-03-20 15:46:58 +00:00
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using std::find;
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2013-03-21 04:18:26 +00:00
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using std::abs;
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2012-09-04 15:33:15 +00:00
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2013-04-07 15:50:23 +00:00
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HTMLTextLine::HTMLTextLine (const HTMLLineState & line_state, const Param & param, AllStateManager & all_manager)
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:param(param)
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,all_manager(all_manager)
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,line_state(line_state)
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2013-05-04 11:26:26 +00:00
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,clip_x1(0)
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,clip_y1(0)
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2013-12-22 08:59:59 +00:00
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,width(0)
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2013-04-06 16:42:54 +00:00
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{ }
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2013-12-22 08:59:59 +00:00
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void HTMLTextLine::append_unicodes(const Unicode * u, int l, double width)
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2012-09-04 15:33:15 +00:00
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{
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2015-03-15 06:39:58 +00:00
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if (l == 1)
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2015-03-15 09:36:06 +00:00
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text.push_back(min(u[0], (unsigned)INT_MAX));
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2014-06-26 17:31:24 +00:00
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else if (l > 1)
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2014-06-26 04:39:35 +00:00
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{
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text.push_back(- decomposed_text.size() - 1);
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decomposed_text.emplace_back();
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decomposed_text.back().assign(u, u + l);
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}
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2013-12-22 08:59:59 +00:00
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this->width += width;
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2012-09-04 15:33:15 +00:00
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}
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2013-04-06 15:51:33 +00:00
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void HTMLTextLine::append_offset(double width)
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2012-09-04 15:33:15 +00:00
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{
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2013-04-03 17:35:44 +00:00
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/*
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* If the last offset is very thin, we can ignore it and directly use it
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* But this should not happen often, and we will also filter near-zero offsets when outputting them
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2014-08-03 11:47:58 +00:00
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* So don't check it.
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*
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* Offset must be appended immediately after the last real (non-padding) char, or the text optimizing
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* algorithm may be confused: it may wrongly convert offsets at the beginning of a line to word-space.
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2013-04-03 17:35:44 +00:00
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*/
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2014-08-03 11:47:58 +00:00
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auto offset_idx = text.size();
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while (offset_idx > 0 && text[offset_idx - 1] == 0)
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--offset_idx;
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if((!offsets.empty()) && (offsets.back().start_idx == offset_idx))
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2012-09-04 15:33:15 +00:00
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offsets.back().width += width;
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else
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2014-08-03 11:47:58 +00:00
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offsets.emplace_back(offset_idx, width);
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2013-12-22 08:59:59 +00:00
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this->width += width;
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2012-09-04 15:33:15 +00:00
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}
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2013-04-07 15:50:23 +00:00
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void HTMLTextLine::append_state(const HTMLTextState & text_state)
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2012-09-04 15:33:15 +00:00
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{
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if(states.empty() || (states.back().start_idx != text.size()))
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{
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2013-04-03 17:35:44 +00:00
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states.emplace_back();
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2012-09-04 15:33:15 +00:00
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states.back().start_idx = text.size();
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2013-03-20 15:46:58 +00:00
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states.back().hash_umask = 0;
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2012-09-04 15:33:15 +00:00
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}
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2013-09-20 08:35:19 +00:00
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HTMLTextState & last_state = states.back();
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last_state = text_state;
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//apply font scale
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last_state.font_size *= last_state.font_info->font_size_scale;
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2012-09-04 15:33:15 +00:00
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}
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2014-06-26 04:39:35 +00:00
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void HTMLTextLine::dump_char(std::ostream & out, int pos)
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2014-06-14 19:44:28 +00:00
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{
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2014-06-26 04:39:35 +00:00
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int c = text[pos];
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if (c > 0)
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{
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Unicode u = c;
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writeUnicodes(out, &u, 1);
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}
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else if (c < 0)
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2014-06-14 19:44:28 +00:00
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{
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2014-06-26 04:39:35 +00:00
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auto dt = decomposed_text[- c - 1];
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writeUnicodes(out, &dt.front(), dt.size());
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}
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}
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void HTMLTextLine::dump_chars(ostream & out, int begin, int len)
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{
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2014-06-27 09:18:29 +00:00
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static const Color transparent(0, 0, 0, true);
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2014-06-26 17:31:24 +00:00
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2014-06-26 04:39:35 +00:00
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if (line_state.first_char_index < 0)
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{
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for (int i = 0; i < len; i++)
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dump_char(out, begin + i);
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2014-06-14 19:44:28 +00:00
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return;
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}
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2014-06-26 04:39:35 +00:00
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bool invisible_group_open = false;
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for(int i = 0; i < len; i++)
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2014-06-14 19:44:28 +00:00
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{
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2014-06-26 04:39:35 +00:00
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if (!line_state.is_char_covered(line_state.first_char_index + begin + i)) //visible
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2014-06-14 19:44:28 +00:00
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{
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2014-06-26 04:39:35 +00:00
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if (invisible_group_open)
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{
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invisible_group_open = false;
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out << "</span>";
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}
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dump_char(out, begin + i);
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2014-06-14 19:44:28 +00:00
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}
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else
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{
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2014-06-26 04:39:35 +00:00
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if (!invisible_group_open)
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{
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2014-06-26 17:31:24 +00:00
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out << "<span class=\"" << all_manager.fill_color.get_css_class_name()
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<< all_manager.fill_color.install(transparent) << " " << all_manager.stroke_color.get_css_class_name()
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<< all_manager.stroke_color.install(transparent) << "\">";
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2014-06-26 04:39:35 +00:00
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invisible_group_open = true;
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}
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dump_char(out, begin + i);
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2014-06-14 19:44:28 +00:00
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}
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}
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2014-06-26 04:39:35 +00:00
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if (invisible_group_open)
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out << "</span>";
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2014-06-14 19:44:28 +00:00
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}
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2013-04-07 09:10:36 +00:00
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void HTMLTextLine::dump_text(ostream & out)
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2012-09-04 15:33:15 +00:00
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{
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/*
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2012-12-11 12:52:36 +00:00
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* Each Line is an independent absolute positioned block
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2012-09-04 15:33:15 +00:00
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* so even we have a few states or offsets, we may omit them
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*/
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2013-04-03 08:28:06 +00:00
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if(text.empty())
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2013-04-07 09:10:36 +00:00
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return;
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2013-04-03 06:04:39 +00:00
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2012-09-04 15:33:15 +00:00
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if(states.empty() || (states[0].start_idx != 0))
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{
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cerr << "Warning: text without a style! Must be a bug in pdf2htmlEX" << endl;
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2013-04-07 09:10:36 +00:00
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return;
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2012-09-04 15:33:15 +00:00
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}
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2013-04-03 17:35:44 +00:00
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// Start Output
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2013-04-03 06:04:39 +00:00
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{
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2013-04-03 17:35:44 +00:00
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// open <div> for the current text line
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2013-04-03 06:04:39 +00:00
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out << "<div class=\"" << CSS::LINE_CN
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2013-04-07 15:50:23 +00:00
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<< " " << CSS::TRANSFORM_MATRIX_CN << all_manager.transform_matrix.install(line_state.transform_matrix)
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2013-05-04 11:26:26 +00:00
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<< " " << CSS::LEFT_CN << all_manager.left.install(line_state.x - clip_x1)
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2013-04-07 08:10:52 +00:00
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<< " " << CSS::HEIGHT_CN << all_manager.height.install(ascent)
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2013-05-04 11:26:26 +00:00
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<< " " << CSS::BOTTOM_CN << all_manager.bottom.install(line_state.y - clip_y1)
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2013-04-04 14:57:50 +00:00
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;
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2013-04-04 08:28:59 +00:00
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// it will be closed by the first state
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2013-04-03 06:04:39 +00:00
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}
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2012-09-04 15:33:15 +00:00
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2013-04-07 08:10:52 +00:00
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std::vector<State*> stack;
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2013-04-03 17:35:44 +00:00
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// a special safeguard in the bottom
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2012-09-06 06:37:09 +00:00
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stack.push_back(nullptr);
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2013-04-03 06:04:39 +00:00
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//accumulated horizontal offset;
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double dx = 0;
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2012-09-06 06:37:09 +00:00
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// whenever a negative offset appears, we should not pop out that <span>
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// otherwise the effect of negative margin-left would disappear
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2012-09-06 11:05:49 +00:00
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size_t last_text_pos_with_negative_offset = 0;
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2012-09-04 15:33:15 +00:00
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size_t cur_text_idx = 0;
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2013-04-03 06:04:39 +00:00
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auto cur_offset_iter = offsets.begin();
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for(auto state_iter2 = states.begin(), state_iter1 = state_iter2++;
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state_iter1 != states.end();
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++state_iter1, ++state_iter2)
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2012-09-04 15:33:15 +00:00
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{
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2013-04-03 06:04:39 +00:00
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// export current state, find a closest parent
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{
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2012-09-06 06:37:09 +00:00
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// greedy
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2013-04-05 13:53:34 +00:00
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double vertical_align = state_iter1->vertical_align;
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int best_cost = State::HASH_ID_COUNT + 1;
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2012-09-06 06:37:09 +00:00
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// we have a nullptr at the beginning, so no need to check for rend
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for(auto iter = stack.rbegin(); *iter; ++iter)
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2012-09-05 07:13:21 +00:00
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{
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2013-04-03 06:04:39 +00:00
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int cost = state_iter1->diff(**iter);
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2013-04-05 13:53:34 +00:00
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if(!equal(vertical_align,0))
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++cost;
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2012-09-06 06:37:09 +00:00
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if(cost < best_cost)
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{
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while(stack.back() != *iter)
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{
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stack.back()->end(out);
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stack.pop_back();
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}
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best_cost = cost;
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2013-04-05 13:53:34 +00:00
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state_iter1->vertical_align = vertical_align;
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2012-09-06 06:37:09 +00:00
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if(best_cost == 0)
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break;
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}
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2012-09-05 07:13:21 +00:00
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2012-09-06 06:37:09 +00:00
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// cannot go further
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if((*iter)->start_idx <= last_text_pos_with_negative_offset)
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break;
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2013-04-05 13:53:34 +00:00
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vertical_align += (*iter)->vertical_align;
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2012-09-06 06:37:09 +00:00
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}
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2013-04-05 13:53:34 +00:00
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//
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2013-04-06 08:32:31 +00:00
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state_iter1->ids[State::VERTICAL_ALIGN_ID] = all_manager.vertical_align.install(state_iter1->vertical_align);
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2013-04-03 17:35:44 +00:00
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// export the diff between *state_iter1 and stack.back()
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2013-04-03 06:04:39 +00:00
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state_iter1->begin(out, stack.back());
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stack.push_back(&*state_iter1);
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2012-09-04 15:33:15 +00:00
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}
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2013-04-03 17:35:44 +00:00
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// [state_iter1->start_idx, text_idx2) are covered by the current state
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2013-04-03 06:04:39 +00:00
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size_t text_idx2 = (state_iter2 == states.end()) ? text.size() : state_iter2->start_idx;
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2012-09-04 15:33:15 +00:00
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2013-04-03 06:10:11 +00:00
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// dump all text and offsets before next state
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2013-04-03 06:04:39 +00:00
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while(true)
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{
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2013-04-03 17:35:44 +00:00
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if((cur_offset_iter != offsets.end())
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&& (cur_offset_iter->start_idx <= cur_text_idx))
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2013-03-21 04:18:26 +00:00
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{
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2013-04-03 06:04:39 +00:00
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if(cur_offset_iter->start_idx > text_idx2)
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break;
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2013-04-03 06:10:11 +00:00
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// next is offset
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2013-04-03 06:04:39 +00:00
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double target = cur_offset_iter->width + dx;
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double actual_offset = 0;
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2013-04-03 17:35:44 +00:00
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//ignore near-zero offsets
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2014-06-24 08:31:33 +00:00
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if(std::abs(target) <= param.h_eps)
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2013-03-24 13:42:51 +00:00
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{
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2013-04-03 06:04:39 +00:00
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actual_offset = 0;
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2013-03-24 13:42:51 +00:00
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}
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2013-04-03 06:04:39 +00:00
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else
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2013-03-24 13:42:51 +00:00
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{
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2013-04-03 06:04:39 +00:00
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bool done = false;
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2013-04-03 17:35:44 +00:00
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// check if the offset is equivalent to a single ' '
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2013-04-03 06:04:39 +00:00
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if(!(state_iter1->hash_umask & State::umask_by_id(State::WORD_SPACE_ID)))
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{
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double space_off = state_iter1->single_space_offset();
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2015-03-15 13:47:31 +00:00
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if(std::abs(target - space_off) <= param.h_eps)
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2013-04-03 06:04:39 +00:00
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{
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Unicode u = ' ';
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2018-01-10 19:31:38 +00:00
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// Sometimes we guess wrong whether we have a valid space character, so ensure it is always hidden
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out << "<span class=\"" << CSS::WHITESPACE_CN << "\">";
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2013-10-18 08:31:59 +00:00
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writeUnicodes(out, &u, 1);
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2018-01-10 19:31:38 +00:00
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out << "</span>";
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2013-04-03 06:04:39 +00:00
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actual_offset = space_off;
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done = true;
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}
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}
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2012-09-04 15:33:15 +00:00
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2013-04-03 17:35:44 +00:00
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// finally, just dump it
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2013-04-03 06:04:39 +00:00
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if(!done)
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2013-03-24 13:42:51 +00:00
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{
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2013-12-22 08:59:59 +00:00
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long long wid = all_manager.whitespace.install(target, &actual_offset);
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2013-12-21 14:47:54 +00:00
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2013-12-22 08:59:59 +00:00
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|
|
if(!equal(actual_offset, 0))
|
2013-12-21 14:47:54 +00:00
|
|
|
{
|
2013-12-22 08:59:59 +00:00
|
|
|
if(is_positive(-actual_offset))
|
|
|
|
last_text_pos_with_negative_offset = cur_text_idx;
|
|
|
|
|
2013-12-21 14:47:54 +00:00
|
|
|
double threshold = state_iter1->em_size() * (param.space_threshold);
|
2013-12-22 08:59:59 +00:00
|
|
|
|
|
|
|
out << "<span class=\"" << CSS::WHITESPACE_CN
|
|
|
|
<< ' ' << CSS::WHITESPACE_CN << wid << "\">" << (target > (threshold - EPS) ? " " : "") << "</span>";
|
2013-04-03 06:04:39 +00:00
|
|
|
}
|
2013-03-24 13:42:51 +00:00
|
|
|
}
|
|
|
|
}
|
2013-04-03 06:04:39 +00:00
|
|
|
dx = target - actual_offset;
|
|
|
|
++ cur_offset_iter;
|
2013-03-21 04:18:26 +00:00
|
|
|
}
|
2013-04-03 06:04:39 +00:00
|
|
|
else
|
|
|
|
{
|
|
|
|
if(cur_text_idx >= text_idx2)
|
|
|
|
break;
|
2013-04-03 06:10:11 +00:00
|
|
|
// next is text
|
2013-04-03 06:04:39 +00:00
|
|
|
size_t next_text_idx = text_idx2;
|
|
|
|
if((cur_offset_iter != offsets.end()) && (cur_offset_iter->start_idx) < next_text_idx)
|
|
|
|
next_text_idx = cur_offset_iter->start_idx;
|
2014-06-26 04:39:35 +00:00
|
|
|
dump_chars(out, cur_text_idx, next_text_idx - cur_text_idx);
|
2013-04-03 06:04:39 +00:00
|
|
|
cur_text_idx = next_text_idx;
|
|
|
|
}
|
|
|
|
}
|
2012-09-04 15:33:15 +00:00
|
|
|
}
|
|
|
|
|
2012-09-05 07:13:21 +00:00
|
|
|
// we have a nullptr in the bottom
|
2012-09-06 06:37:09 +00:00
|
|
|
while(stack.back())
|
2012-09-05 07:13:21 +00:00
|
|
|
{
|
2012-09-06 06:37:09 +00:00
|
|
|
stack.back()->end(out);
|
|
|
|
stack.pop_back();
|
2012-09-05 07:13:21 +00:00
|
|
|
}
|
|
|
|
|
2012-09-04 15:33:15 +00:00
|
|
|
out << "</div>";
|
2013-04-06 16:42:54 +00:00
|
|
|
}
|
2012-09-04 15:33:15 +00:00
|
|
|
|
2013-04-06 16:42:54 +00:00
|
|
|
void HTMLTextLine::clear(void)
|
|
|
|
{
|
2012-09-04 15:33:15 +00:00
|
|
|
states.clear();
|
|
|
|
offsets.clear();
|
|
|
|
text.clear();
|
|
|
|
}
|
|
|
|
|
2013-05-04 13:17:35 +00:00
|
|
|
void HTMLTextLine::clip(const HTMLClipState & clip_state)
|
2013-05-04 11:26:26 +00:00
|
|
|
{
|
2013-05-04 13:17:35 +00:00
|
|
|
clip_x1 = clip_state.xmin;
|
|
|
|
clip_y1 = clip_state.ymin;
|
2013-05-04 11:26:26 +00:00
|
|
|
}
|
|
|
|
|
2013-04-07 08:10:52 +00:00
|
|
|
void HTMLTextLine::prepare(void)
|
|
|
|
{
|
|
|
|
// max_ascent determines the height of the div
|
|
|
|
double accum_vertical_align = 0; // accumulated
|
|
|
|
ascent = 0;
|
|
|
|
descent = 0;
|
|
|
|
// note that vertical_align cannot be calculated here
|
|
|
|
for(auto iter = states.begin(); iter != states.end(); ++iter)
|
|
|
|
{
|
2013-09-20 08:35:19 +00:00
|
|
|
auto font_info = iter->font_info;
|
|
|
|
iter->ids[State::FONT_ID] = font_info->id;
|
2013-04-07 08:10:52 +00:00
|
|
|
iter->ids[State::FONT_SIZE_ID] = all_manager.font_size.install(iter->font_size);
|
|
|
|
iter->ids[State::FILL_COLOR_ID] = all_manager.fill_color.install(iter->fill_color);
|
|
|
|
iter->ids[State::STROKE_COLOR_ID] = all_manager.stroke_color.install(iter->stroke_color);
|
|
|
|
iter->ids[State::LETTER_SPACE_ID] = all_manager.letter_space.install(iter->letter_space);
|
|
|
|
iter->ids[State::WORD_SPACE_ID] = all_manager.word_space.install(iter->word_space);
|
|
|
|
iter->hash();
|
|
|
|
|
|
|
|
accum_vertical_align += iter->vertical_align;
|
2013-09-20 08:35:19 +00:00
|
|
|
double cur_ascent = accum_vertical_align + font_info->ascent * iter->font_size;
|
2013-04-07 08:10:52 +00:00
|
|
|
if(cur_ascent > ascent)
|
|
|
|
ascent = cur_ascent;
|
2013-09-20 08:35:19 +00:00
|
|
|
double cur_descent = accum_vertical_align + font_info->descent * iter->font_size;
|
2013-04-07 08:10:52 +00:00
|
|
|
if(cur_descent < descent)
|
|
|
|
descent = cur_descent;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
2013-12-22 08:59:59 +00:00
|
|
|
void HTMLTextLine::optimize(std::vector<HTMLTextLine*> & lines)
|
|
|
|
{
|
|
|
|
if(param.optimize_text == 3)
|
|
|
|
{
|
|
|
|
optimize_aggressive(lines);
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
optimize_normal(lines);
|
|
|
|
}
|
|
|
|
}
|
2013-04-03 07:44:28 +00:00
|
|
|
/*
|
|
|
|
* Adjust letter space and word space in order to reduce the number of HTML elements
|
|
|
|
* May also unmask word space
|
|
|
|
*/
|
2013-12-22 08:59:59 +00:00
|
|
|
void HTMLTextLine::optimize_normal(std::vector<HTMLTextLine*> & lines)
|
2013-03-20 15:46:58 +00:00
|
|
|
{
|
2014-07-13 23:59:30 +00:00
|
|
|
// remove useless states in the end
|
2013-04-07 08:10:52 +00:00
|
|
|
while((!states.empty()) && (states.back().start_idx >= text.size()))
|
|
|
|
states.pop_back();
|
2013-04-03 01:06:32 +00:00
|
|
|
|
2013-03-20 15:46:58 +00:00
|
|
|
assert(!states.empty());
|
|
|
|
|
2013-04-03 07:44:28 +00:00
|
|
|
const long long word_space_umask = State::umask_by_id(State::WORD_SPACE_ID);
|
|
|
|
|
2013-04-03 06:04:39 +00:00
|
|
|
// for optimization, we need accurate values
|
2013-04-06 08:32:31 +00:00
|
|
|
auto & ls_manager = all_manager.letter_space;
|
|
|
|
auto & ws_manager = all_manager.word_space;
|
2013-04-03 06:04:39 +00:00
|
|
|
|
2013-04-03 07:44:28 +00:00
|
|
|
// statistics of widths
|
2013-04-03 08:28:06 +00:00
|
|
|
std::map<double, size_t> width_map;
|
2013-04-03 07:44:28 +00:00
|
|
|
// store optimized offsets
|
|
|
|
std::vector<Offset> new_offsets;
|
|
|
|
new_offsets.reserve(offsets.size());
|
2013-03-30 17:00:04 +00:00
|
|
|
|
2013-04-03 07:44:28 +00:00
|
|
|
auto offset_iter1 = offsets.begin();
|
2018-01-10 19:31:38 +00:00
|
|
|
for(auto state_iter1 = states.begin(); state_iter1 != states.end(); ++state_iter1)
|
2013-03-21 04:18:26 +00:00
|
|
|
{
|
2018-01-10 19:31:38 +00:00
|
|
|
const auto state_iter2 = std::next(state_iter1);
|
2013-04-03 07:44:28 +00:00
|
|
|
const size_t text_idx1 = state_iter1->start_idx;
|
|
|
|
const size_t text_idx2 = (state_iter2 == states.end()) ? text.size() : state_iter2->start_idx;
|
2018-01-10 19:31:38 +00:00
|
|
|
const size_t text_count = text_idx2 - text_idx1;
|
2013-03-30 17:00:04 +00:00
|
|
|
|
2013-04-03 17:35:44 +00:00
|
|
|
// there might be some offsets before the first state
|
|
|
|
while((offset_iter1 != offsets.end())
|
|
|
|
&& (offset_iter1->start_idx <= text_idx1))
|
2013-04-03 07:51:55 +00:00
|
|
|
{
|
|
|
|
new_offsets.push_back(*(offset_iter1++));
|
|
|
|
}
|
2013-04-03 17:35:44 +00:00
|
|
|
|
|
|
|
// find the last offset covered by the current state
|
2013-04-03 06:17:27 +00:00
|
|
|
auto offset_iter2 = offset_iter1;
|
|
|
|
for(; (offset_iter2 != offsets.end()) && (offset_iter2->start_idx <= text_idx2); ++offset_iter2) { }
|
2013-04-03 17:35:44 +00:00
|
|
|
|
2013-04-03 07:44:28 +00:00
|
|
|
// There are `offset_count` <span>'s, the target is to reduce this number
|
|
|
|
size_t offset_count = offset_iter2 - offset_iter1;
|
|
|
|
assert(text_count >= offset_count);
|
2013-04-03 17:35:44 +00:00
|
|
|
|
2013-04-03 07:44:28 +00:00
|
|
|
// Optimize letter space
|
2013-04-03 17:35:44 +00:00
|
|
|
// how much letter_space is changed
|
|
|
|
// will be later used for optimizing word space
|
|
|
|
double letter_space_diff = 0;
|
|
|
|
width_map.clear();
|
2013-03-30 17:00:04 +00:00
|
|
|
|
2013-04-03 07:44:28 +00:00
|
|
|
// In some PDF files all letter spaces are implemented as position shifts between each letter
|
|
|
|
// try to simplify it with a proper letter space
|
|
|
|
if(offset_count > 0)
|
2013-03-21 04:18:26 +00:00
|
|
|
{
|
2013-04-03 07:44:28 +00:00
|
|
|
// mark the current letter_space
|
|
|
|
if(text_count > offset_count)
|
|
|
|
width_map.insert(std::make_pair(0, text_count - offset_count));
|
2013-03-30 17:21:14 +00:00
|
|
|
|
2013-04-03 07:44:28 +00:00
|
|
|
for(auto off_iter = offset_iter1; off_iter != offset_iter2; ++off_iter)
|
2013-03-21 04:18:26 +00:00
|
|
|
{
|
2013-04-03 07:44:28 +00:00
|
|
|
const double target = off_iter->width;
|
|
|
|
auto iter = width_map.lower_bound(target-EPS);
|
2014-06-24 08:31:33 +00:00
|
|
|
if((iter != width_map.end()) && (std::abs(iter->first - target) <= EPS))
|
2013-04-03 07:44:28 +00:00
|
|
|
{
|
|
|
|
++ iter->second;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
width_map.insert(iter, std::make_pair(target, 1));
|
|
|
|
}
|
|
|
|
}
|
2013-04-03 17:35:44 +00:00
|
|
|
|
|
|
|
// TODO snapping the widths may result a better result
|
|
|
|
// e.g. for (-0.7 0.6 -0.2 0.3 10 10), 0 is better than 10
|
2013-04-03 07:44:28 +00:00
|
|
|
double most_used_width = 0;
|
2013-04-03 08:28:06 +00:00
|
|
|
size_t max_count = 0;
|
2013-04-03 07:44:28 +00:00
|
|
|
for(auto iter = width_map.begin(); iter != width_map.end(); ++iter)
|
|
|
|
{
|
|
|
|
if(iter->second > max_count)
|
|
|
|
{
|
|
|
|
most_used_width = iter->first;
|
|
|
|
max_count = iter->second;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2013-04-05 13:53:34 +00:00
|
|
|
// negative letter space may cause problems
|
2013-04-05 14:44:49 +00:00
|
|
|
if((max_count <= text_count / 2) || (!is_positive(state_iter1->letter_space + most_used_width)))
|
2013-04-03 07:44:28 +00:00
|
|
|
{
|
|
|
|
// the old value is the best
|
2013-04-03 17:35:44 +00:00
|
|
|
// just copy old offsets
|
2013-04-03 07:44:28 +00:00
|
|
|
new_offsets.insert(new_offsets.end(), offset_iter1, offset_iter2);
|
2013-03-21 04:18:26 +00:00
|
|
|
}
|
2013-03-30 17:00:04 +00:00
|
|
|
else
|
2013-03-21 04:18:26 +00:00
|
|
|
{
|
2013-04-05 13:53:34 +00:00
|
|
|
// now we would like to adjust letter space to most_used width
|
|
|
|
|
2013-04-03 07:44:28 +00:00
|
|
|
// install new letter space
|
2013-04-04 14:57:50 +00:00
|
|
|
const double old_ls = state_iter1->letter_space;
|
|
|
|
state_iter1->ids[State::LETTER_SPACE_ID] = ls_manager.install(old_ls + most_used_width, &(state_iter1->letter_space));
|
|
|
|
letter_space_diff = old_ls - state_iter1->letter_space;
|
2013-04-03 07:44:28 +00:00
|
|
|
// update offsets
|
|
|
|
auto off_iter = offset_iter1;
|
|
|
|
// re-count number of offsets
|
|
|
|
offset_count = 0;
|
|
|
|
for(size_t cur_text_idx = text_idx1; cur_text_idx < text_idx2; ++cur_text_idx)
|
|
|
|
{
|
|
|
|
double cur_width = 0;
|
|
|
|
if((off_iter != offset_iter2) && (off_iter->start_idx == cur_text_idx + 1))
|
|
|
|
{
|
|
|
|
cur_width = off_iter->width + letter_space_diff;
|
|
|
|
++off_iter;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
cur_width = letter_space_diff ;
|
|
|
|
}
|
|
|
|
if(!equal(cur_width, 0))
|
|
|
|
{
|
2013-04-03 17:35:44 +00:00
|
|
|
new_offsets.emplace_back(cur_text_idx+1, cur_width);
|
2013-04-03 07:44:28 +00:00
|
|
|
++ offset_count;
|
|
|
|
}
|
|
|
|
}
|
2013-03-21 04:18:26 +00:00
|
|
|
}
|
2013-03-30 17:00:04 +00:00
|
|
|
}
|
2013-03-21 04:18:26 +00:00
|
|
|
|
2013-04-03 07:44:28 +00:00
|
|
|
// Optimize word space
|
|
|
|
|
2014-07-13 23:59:30 +00:00
|
|
|
// In some PDF files all spaces are converted into positioning shift
|
2013-04-03 07:44:28 +00:00
|
|
|
// We may try to change (some of) them to ' ' by adjusting word_space
|
2014-07-13 23:59:30 +00:00
|
|
|
// for now, we consider only the no-space scenario
|
2013-04-06 09:01:05 +00:00
|
|
|
// which also includes the case when param.space_as_offset is set
|
2013-04-03 17:35:44 +00:00
|
|
|
|
|
|
|
// get the text segment covered by current state (*state_iter1)
|
|
|
|
const auto text_iter1 = text.begin() + text_idx1;
|
|
|
|
const auto text_iter2 = text.begin() + text_idx2;
|
2013-05-02 06:32:17 +00:00
|
|
|
if(find(text_iter1, text_iter2, ' ') == text_iter2)
|
2013-03-30 17:00:04 +00:00
|
|
|
{
|
2013-04-03 07:44:28 +00:00
|
|
|
// if there is not any space, we may change the value of word_space arbitrarily
|
|
|
|
// note that we may only change word space, no offset will be affected
|
|
|
|
// The actual effect will emerge during flushing, where it could be detected that an offset can be optimized as a single space character
|
|
|
|
|
|
|
|
if(offset_count > 0)
|
2013-03-21 04:18:26 +00:00
|
|
|
{
|
2013-04-06 09:01:05 +00:00
|
|
|
double threshold = (state_iter1->em_size()) * (param.space_threshold);
|
2013-04-03 07:44:28 +00:00
|
|
|
// set word_space for the most frequently used offset
|
|
|
|
double most_used_width = 0;
|
2013-04-03 08:28:06 +00:00
|
|
|
size_t max_count = 0;
|
2013-04-03 07:44:28 +00:00
|
|
|
|
|
|
|
// if offset_count > 0, we must have updated width_map in the previous step
|
|
|
|
// find the most frequent width, with new letter space applied
|
|
|
|
for(auto iter = width_map.begin(); iter != width_map.end(); ++iter)
|
|
|
|
{
|
2013-04-03 17:35:44 +00:00
|
|
|
double fixed_width = iter->first + letter_space_diff; // this is the actual offset in HTML
|
2013-04-03 07:44:28 +00:00
|
|
|
// we don't want to add spaces for tiny gaps, or even negative shifts
|
|
|
|
if((fixed_width >= threshold - EPS) && (iter->second > max_count))
|
|
|
|
{
|
|
|
|
max_count = iter->second;
|
|
|
|
most_used_width = fixed_width;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2013-04-04 14:57:50 +00:00
|
|
|
state_iter1->word_space = 0; // clear word_space for single_space_offset
|
2013-04-03 07:44:28 +00:00
|
|
|
double new_word_space = most_used_width - state_iter1->single_space_offset();
|
2013-04-04 14:57:50 +00:00
|
|
|
state_iter1->ids[State::WORD_SPACE_ID] = ws_manager.install(new_word_space, &(state_iter1->word_space)); // install new word_space
|
2013-04-03 17:35:44 +00:00
|
|
|
state_iter1->hash_umask &= (~word_space_umask); // mark that the word_space is not free
|
2013-04-03 07:44:28 +00:00
|
|
|
}
|
2013-04-03 17:35:44 +00:00
|
|
|
else // there is no offset at all
|
2013-04-03 07:44:28 +00:00
|
|
|
{
|
2013-04-03 17:35:44 +00:00
|
|
|
state_iter1->hash_umask |= word_space_umask; // we just free word_space
|
2013-03-21 04:18:26 +00:00
|
|
|
}
|
|
|
|
}
|
2013-04-03 06:17:27 +00:00
|
|
|
offset_iter1 = offset_iter2;
|
2013-03-30 17:00:04 +00:00
|
|
|
}
|
2013-04-03 07:44:28 +00:00
|
|
|
|
|
|
|
// apply optimization
|
|
|
|
std::swap(offsets, new_offsets);
|
2013-12-22 08:59:59 +00:00
|
|
|
|
|
|
|
lines.push_back(this);
|
|
|
|
}
|
|
|
|
|
|
|
|
// for optimize-text == 3
|
|
|
|
void HTMLTextLine::optimize_aggressive(std::vector<HTMLTextLine*> & lines)
|
|
|
|
{
|
2014-06-07 04:43:53 +00:00
|
|
|
/*
|
2013-12-26 11:52:03 +00:00
|
|
|
HTMLLineState original_line_state = line_state;
|
|
|
|
// break the line if there are a large (positive or negative) shift
|
|
|
|
// letter space / word space are not taken into consideration (yet)
|
2013-12-22 08:59:59 +00:00
|
|
|
while(true)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
// aggressive optimization
|
|
|
|
if(target > state_iter1->em_size() * (param.space_threshold) - EPS)
|
|
|
|
out << ' ';
|
|
|
|
dx = 0;
|
|
|
|
lines.push_back(this);
|
|
|
|
*/
|
2013-03-20 15:46:58 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
// this state will be converted to a child node of the node of prev_state
|
|
|
|
// dump the difference between previous state
|
|
|
|
// also clone corresponding states
|
2013-04-06 15:51:33 +00:00
|
|
|
void HTMLTextLine::State::begin (ostream & out, const State * prev_state)
|
2012-09-05 07:13:21 +00:00
|
|
|
{
|
2013-04-04 08:28:59 +00:00
|
|
|
if(prev_state)
|
2012-09-04 15:33:15 +00:00
|
|
|
{
|
2013-04-04 08:28:59 +00:00
|
|
|
long long cur_mask = 0xff;
|
|
|
|
bool first = true;
|
2013-04-05 13:53:34 +00:00
|
|
|
for(int i = 0; i < HASH_ID_COUNT; ++i, cur_mask<<=8)
|
2013-03-20 15:46:58 +00:00
|
|
|
{
|
2013-04-04 08:28:59 +00:00
|
|
|
if(hash_umask & cur_mask) // we don't care about this ID
|
2013-03-20 15:46:58 +00:00
|
|
|
{
|
2013-04-04 08:28:59 +00:00
|
|
|
if (prev_state->hash_umask & cur_mask) // if prev_state do not care about it either
|
|
|
|
continue;
|
|
|
|
|
|
|
|
// otherwise
|
2013-03-20 15:46:58 +00:00
|
|
|
// we have to inherit it
|
|
|
|
ids[i] = prev_state->ids[i];
|
|
|
|
hash_umask &= (~cur_mask);
|
2013-03-25 04:23:29 +00:00
|
|
|
//copy the corresponding value
|
|
|
|
//TODO: this is so ugly
|
|
|
|
switch(i)
|
|
|
|
{
|
2013-04-04 08:28:59 +00:00
|
|
|
case FONT_SIZE_ID:
|
2013-04-04 14:57:50 +00:00
|
|
|
font_size = prev_state->font_size;
|
2013-04-04 08:28:59 +00:00
|
|
|
break;
|
|
|
|
case LETTER_SPACE_ID:
|
2013-04-04 14:57:50 +00:00
|
|
|
letter_space = prev_state->letter_space;
|
2013-04-04 08:28:59 +00:00
|
|
|
break;
|
|
|
|
case WORD_SPACE_ID:
|
2013-04-04 14:57:50 +00:00
|
|
|
word_space = prev_state->word_space;
|
2013-04-04 08:28:59 +00:00
|
|
|
break;
|
|
|
|
default:
|
2013-04-05 13:53:34 +00:00
|
|
|
cerr << "unexpected state mask" << endl;
|
2013-04-04 08:28:59 +00:00
|
|
|
break;
|
2013-03-25 04:23:29 +00:00
|
|
|
}
|
2013-03-20 15:46:58 +00:00
|
|
|
}
|
|
|
|
|
2013-04-04 08:28:59 +00:00
|
|
|
// now we care about the ID
|
|
|
|
|
|
|
|
// if the value from prev_state is the same, we don't need to dump it
|
|
|
|
if((!(prev_state->hash_umask & cur_mask)) && (prev_state->ids[i] == ids[i]))
|
|
|
|
continue;
|
2012-09-05 07:13:21 +00:00
|
|
|
|
2013-04-04 08:28:59 +00:00
|
|
|
// so we have to dump it
|
|
|
|
if(first)
|
|
|
|
{
|
|
|
|
out << "<span class=\"";
|
|
|
|
first = false;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
out << ' ';
|
|
|
|
}
|
|
|
|
|
|
|
|
// out should have hex set
|
|
|
|
out << css_class_names[i];
|
|
|
|
if (ids[i] == -1)
|
|
|
|
out << CSS::INVALID_ID;
|
|
|
|
else
|
|
|
|
out << ids[i];
|
2012-09-05 07:13:21 +00:00
|
|
|
}
|
2014-07-13 23:59:30 +00:00
|
|
|
// vertical align
|
2013-04-05 13:53:34 +00:00
|
|
|
if(!equal(vertical_align, 0))
|
|
|
|
{
|
|
|
|
// so we have to dump it
|
|
|
|
if(first)
|
|
|
|
{
|
|
|
|
out << "<span class=\"";
|
|
|
|
first = false;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
out << ' ';
|
|
|
|
}
|
|
|
|
|
|
|
|
// out should have hex set
|
|
|
|
out << CSS::VERTICAL_ALIGN_CN;
|
|
|
|
auto id = ids[VERTICAL_ALIGN_ID];
|
|
|
|
if (id == -1)
|
|
|
|
out << CSS::INVALID_ID;
|
|
|
|
else
|
|
|
|
out << id;
|
|
|
|
}
|
2013-04-04 08:28:59 +00:00
|
|
|
|
|
|
|
if(first) // we actually just inherit the whole prev_state
|
2012-09-05 07:13:21 +00:00
|
|
|
{
|
2013-04-04 08:28:59 +00:00
|
|
|
need_close = false;
|
2012-09-05 07:13:21 +00:00
|
|
|
}
|
2013-01-31 22:21:57 +00:00
|
|
|
else
|
2013-04-04 08:28:59 +00:00
|
|
|
{
|
|
|
|
out << "\">";
|
|
|
|
need_close = true;
|
|
|
|
}
|
2012-09-06 06:37:09 +00:00
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
2013-04-04 08:28:59 +00:00
|
|
|
// prev_state == nullptr
|
|
|
|
// which means this is the first state of the line
|
|
|
|
// there should be a open pending <div> left there
|
2013-04-05 13:53:34 +00:00
|
|
|
// it is not necessary to output vertical align
|
2013-04-04 08:28:59 +00:00
|
|
|
long long cur_mask = 0xff;
|
2013-04-05 13:53:34 +00:00
|
|
|
for(int i = 0; i < HASH_ID_COUNT; ++i, cur_mask<<=8)
|
2013-04-04 08:28:59 +00:00
|
|
|
{
|
|
|
|
if(hash_umask & cur_mask) // we don't care about this ID
|
|
|
|
continue;
|
|
|
|
|
|
|
|
// now we care about the ID
|
|
|
|
out << ' ';
|
|
|
|
// out should have hex set
|
|
|
|
out << css_class_names[i];
|
|
|
|
if (ids[i] == -1)
|
|
|
|
out << CSS::INVALID_ID;
|
|
|
|
else
|
|
|
|
out << ids[i];
|
|
|
|
}
|
|
|
|
|
2012-09-06 06:37:09 +00:00
|
|
|
out << "\">";
|
2013-04-04 08:28:59 +00:00
|
|
|
need_close = false;
|
2012-09-06 06:37:09 +00:00
|
|
|
}
|
2012-09-04 15:33:15 +00:00
|
|
|
}
|
|
|
|
|
2013-04-06 15:51:33 +00:00
|
|
|
void HTMLTextLine::State::end(ostream & out) const
|
2012-09-05 07:13:21 +00:00
|
|
|
{
|
|
|
|
if(need_close)
|
|
|
|
out << "</span>";
|
|
|
|
}
|
|
|
|
|
2013-04-06 15:51:33 +00:00
|
|
|
void HTMLTextLine::State::hash(void)
|
2012-09-05 07:13:21 +00:00
|
|
|
{
|
|
|
|
hash_value = 0;
|
|
|
|
for(int i = 0; i < ID_COUNT; ++i)
|
|
|
|
{
|
|
|
|
hash_value = (hash_value << 8) | (ids[i] & 0xff);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2013-04-06 15:51:33 +00:00
|
|
|
int HTMLTextLine::State::diff(const State & s) const
|
2012-09-04 15:33:15 +00:00
|
|
|
{
|
2012-09-05 07:13:21 +00:00
|
|
|
/*
|
|
|
|
* A quick check based on hash_value
|
|
|
|
* it could be wrong when there are more then 256 classes,
|
2012-09-05 08:19:01 +00:00
|
|
|
* in which case the output may not be optimal, but still 'correct' in terms of HTML
|
2012-09-05 07:13:21 +00:00
|
|
|
*/
|
2013-03-20 15:46:58 +00:00
|
|
|
long long common_mask = ~(hash_umask | s.hash_umask);
|
|
|
|
if((hash_value & common_mask) == (s.hash_value & common_mask)) return 0;
|
2012-09-05 07:13:21 +00:00
|
|
|
|
2013-03-20 15:46:58 +00:00
|
|
|
long long cur_mask = 0xff;
|
2012-09-05 07:13:21 +00:00
|
|
|
int d = 0;
|
|
|
|
for(int i = 0; i < ID_COUNT; ++i)
|
2013-03-20 15:46:58 +00:00
|
|
|
{
|
|
|
|
if((common_mask & cur_mask) && (ids[i] != s.ids[i]))
|
2012-09-05 07:13:21 +00:00
|
|
|
++ d;
|
2013-03-20 15:46:58 +00:00
|
|
|
cur_mask <<= 8;
|
|
|
|
}
|
2012-09-05 07:13:21 +00:00
|
|
|
return d;
|
2012-09-04 15:33:15 +00:00
|
|
|
}
|
|
|
|
|
2013-04-06 15:51:33 +00:00
|
|
|
long long HTMLTextLine::State::umask_by_id(int id)
|
2013-03-25 04:23:29 +00:00
|
|
|
{
|
|
|
|
return (((long long)0xff) << (8*id));
|
|
|
|
}
|
|
|
|
|
2013-02-05 10:19:25 +00:00
|
|
|
// the order should be the same as in the enum
|
2013-04-06 15:51:33 +00:00
|
|
|
const char * const HTMLTextLine::State::css_class_names [] = {
|
2013-02-28 07:59:14 +00:00
|
|
|
CSS::FONT_FAMILY_CN,
|
2013-02-05 10:19:25 +00:00
|
|
|
CSS::FONT_SIZE_CN,
|
|
|
|
CSS::FILL_COLOR_CN,
|
|
|
|
CSS::STROKE_COLOR_CN,
|
|
|
|
CSS::LETTER_SPACE_CN,
|
|
|
|
CSS::WORD_SPACE_CN,
|
2013-04-05 13:53:34 +00:00
|
|
|
CSS::VERTICAL_ALIGN_CN,
|
2013-02-05 10:19:25 +00:00
|
|
|
};
|
|
|
|
|
2012-09-12 15:26:14 +00:00
|
|
|
} //namespace pdf2htmlEX
|