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// SPDX-License-Identifier: GPL-2.0-or-later
/** @file
* Inkscape::SVG::PathString - builder for SVG path strings
*//*
* Authors: see git history
*
* Copyright 2008 Jasper van de Gronde <th.v.d.gronde@hccnet.nl>
* Copyright 2013 Tavmjong Bah <tavmjong@free.fr>
* Copyright (C) 2018 Authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "svg/path-string.h"
#include "svg/stringstream.h"
#include "svg/svg.h"
#include "preferences.h"
// 1<=numericprecision<=16, doubles are only accurate upto (slightly less than) 16 digits (and less than one digit doesn't make sense)
// Please note that these constants are used to allocate sufficient space to hold serialized numbers
static int const minprec = 1;
static int const maxprec = 16;
int Inkscape::SVG::PathString::numericprecision;
int Inkscape::SVG::PathString::minimumexponent;
Inkscape::SVG::PATHSTRING_FORMAT Inkscape::SVG::PathString::format;
Inkscape::SVG::PathString::PathString() :
force_repeat_commands(!Inkscape::Preferences::get()->getBool("/options/svgoutput/disable_optimizations" ) && Inkscape::Preferences::get()->getBool("/options/svgoutput/forcerepeatcommands"))
{
Inkscape::Preferences *prefs = Inkscape::Preferences::get();
format = (PATHSTRING_FORMAT)prefs->getIntLimited("/options/svgoutput/pathstring_format", 1, 0, PATHSTRING_FORMAT_SIZE - 1 );
numericprecision = std::max<int>(minprec,std::min<int>(maxprec, prefs->getInt("/options/svgoutput/numericprecision", 8)));
minimumexponent = prefs->getInt("/options/svgoutput/minimumexponent", -8);
}
// For absolute and relative paths... the entire path is kept in the "tail".
// For optimized path, at a switch between absolute and relative, add tail to commonbase.
void Inkscape::SVG::PathString::_appendOp(char abs_op, char rel_op) {
bool abs_op_repeated = _abs_state.prevop == abs_op && !force_repeat_commands;
bool rel_op_repeated = _rel_state.prevop == rel_op && !force_repeat_commands;
// For absolute and relative paths... do nothing.
switch (format) {
case PATHSTRING_ABSOLUTE:
if ( !abs_op_repeated ) _abs_state.appendOp(abs_op);
break;
case PATHSTRING_RELATIVE:
if ( !rel_op_repeated ) _rel_state.appendOp(rel_op);
break;
case PATHSTRING_OPTIMIZE:
{
unsigned int const abs_added_size = abs_op_repeated ? 0 : 2;
unsigned int const rel_added_size = rel_op_repeated ? 0 : 2;
if ( _rel_state.str.size()+2 < _abs_state.str.size()+abs_added_size ) {
// Store common prefix
commonbase += _rel_state.str;
_rel_state.str.clear();
// Copy rel to abs
_abs_state = _rel_state;
_abs_state.switches++;
abs_op_repeated = false;
// We do not have to copy abs to rel:
// _rel_state.str.size()+2 < _abs_state.str.size()+abs_added_size
// _rel_state.str.size()+rel_added_size < _abs_state.str.size()+2
// _abs_state.str.size()+2 > _rel_state.str.size()+rel_added_size
} else if ( _abs_state.str.size()+2 < _rel_state.str.size()+rel_added_size ) {
// Store common prefix
commonbase += _abs_state.str;
_abs_state.str.clear();
// Copy abs to rel
_rel_state = _abs_state;
_abs_state.switches++;
rel_op_repeated = false;
}
if ( !abs_op_repeated ) _abs_state.appendOp(abs_op);
if ( !rel_op_repeated ) _rel_state.appendOp(rel_op);
}
break;
default:
std::cout << "Better not be here!" << std::endl;
}
}
void Inkscape::SVG::PathString::State::append(Geom::Coord v) {
str += ' ';
appendNumber(v);
}
void Inkscape::SVG::PathString::State::append(Geom::Point p) {
str += ' ';
appendNumber(p[Geom::X]);
str += ',';
appendNumber(p[Geom::Y]);
}
void Inkscape::SVG::PathString::State::append(Geom::Coord v, Geom::Coord& rv) {
str += ' ';
appendNumber(v, rv);
}
void Inkscape::SVG::PathString::State::append(Geom::Point p, Geom::Point &rp) {
str += ' ';
appendNumber(p[Geom::X], rp[Geom::X]);
str += ',';
appendNumber(p[Geom::Y], rp[Geom::Y]);
}
// NOTE: The following appendRelativeCoord function will not be exact if the total number of digits needed
// to represent the difference exceeds the precision of a double. This is not very likely though, and if
// it does happen the imprecise value is not likely to be chosen (because it will probably be a lot longer
// than the absolute value).
// NOTE: This assumes v and r are already rounded (this includes flushing to zero if they are < 10^minexp)
void Inkscape::SVG::PathString::State::appendRelativeCoord(Geom::Coord v, Geom::Coord r) {
int const minexp = minimumexponent-numericprecision+1;
int const digitsEnd = (int)floor(log10(std::min(fabs(v),fabs(r)))) - numericprecision; // Position just beyond the last significant digit of the smallest (in absolute sense) number
double const roundeddiff = floor((v-r)*pow(10.,-digitsEnd-1)+.5);
int const numDigits = (int)floor(log10(fabs(roundeddiff)))+1; // Number of digits in roundeddiff
if (r == 0) {
appendNumber(v, numericprecision, minexp);
} else if (v == 0) {
appendNumber(-r, numericprecision, minexp);
} else if (numDigits>0) {
appendNumber(v-r, numDigits, minexp);
} else {
// This assumes the input numbers are already rounded to 'precision' digits
str += '0';
}
}
void Inkscape::SVG::PathString::State::appendRelative(Geom::Point p, Geom::Point r) {
str += ' ';
appendRelativeCoord(p[Geom::X], r[Geom::X]);
str += ',';
appendRelativeCoord(p[Geom::Y], r[Geom::Y]);
}
void Inkscape::SVG::PathString::State::appendRelative(Geom::Coord v, Geom::Coord r) {
str += ' ';
appendRelativeCoord(v, r);
}
void Inkscape::SVG::PathString::State::appendNumber(double v, int precision, int minexp) {
size_t const reserve = precision+1+1+1+1+3; // Just large enough to hold the maximum number of digits plus a sign, a period, the letter 'e', another sign and three digits for the exponent
size_t const oldsize = str.size();
str.append(reserve, (char)0);
char* begin_of_num = const_cast<char*>(str.data()+oldsize); // Slightly evil, I know (but std::string should be storing its data in one big block of memory, so...)
size_t added = sp_svg_number_write_de(begin_of_num, reserve, v, precision, minexp);
str.resize(oldsize+added); // remove any trailing characters
}
void Inkscape::SVG::PathString::State::appendNumber(double v, double &rv, int precision, int minexp) {
size_t const oldsize = str.size();
appendNumber(v, precision, minexp);
char* begin_of_num = const_cast<char*>(str.data()+oldsize); // Slightly evil, I know (but std::string should be storing its data in one big block of memory, so...)
sp_svg_number_read_d(begin_of_num, &rv);
}
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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