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/*************************************************************************
** GFTracer.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2019 Martin Gieseking <martin.gieseking@uos.de> **
** **
** This program is free software; you can redistribute it and/or **
** modify it under the terms of the GNU General Public License as **
** published by the Free Software Foundation; either version 3 of **
** the License, or (at your option) any later version. **
** **
** This program is distributed in the hope that it will be useful, but **
** WITHOUT ANY WARRANTY; without even the implied warranty of **
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the **
** GNU General Public License for more details. **
** **
** You should have received a copy of the GNU General Public License **
** along with this program; if not, see <http://www.gnu.org/licenses/>. **
*************************************************************************/
#include <fstream>
#include <potracelib.h>
#include "GFTracer.hpp"
#include "Glyph.hpp"
#include "Message.hpp"
using namespace std;
GFTracer::GFTracer (istream &is)
: GFReader(is), _unitsPerPoint(0.0)
{
}
/** Constructs a new GFTracer.
* @param[in] is GF file is read from this stream
* @param[in] upp target units per PS point */
GFTracer::GFTracer (istream &is, double upp)
: GFReader(is), _unitsPerPoint(upp)
{
}
void GFTracer::beginChar (uint32_t c) {
}
void GFTracer::endChar (uint32_t c) {
const Bitmap &bitmap = getBitmap();
if (bitmap.empty())
return;
// prepare potrace's bitmap structure
vector<potrace_word> buffer;
potrace_bitmap_t pobitmap;
pobitmap.w = bitmap.width();
pobitmap.h = bitmap.height();
pobitmap.dy = bitmap.copy(buffer);
pobitmap.map = &buffer[0];
potrace_param_t *param = potrace_param_default();
potrace_state_t *state = potrace_trace(param, &pobitmap);
potrace_param_free(param);
if (!state || state->status == POTRACE_STATUS_INCOMPLETE)
Message::wstream(true) << "error while tracing character\n";
else {
double hsf=1.0, vsf=1.0; // horizontal a d vertical scale factor
if (_unitsPerPoint != 0.0) {
hsf = _unitsPerPoint/getHPixelsPerPoint(); // horizontal scale factor
vsf = _unitsPerPoint/getVPixelsPerPoint(); // vertical scale factor
}
for (potrace_path_t *path = state->plist; path; path = path->next) {
potrace_dpoint_t &p = path->curve.c[path->curve.n-1][2]; // start/end point
moveTo(hsf*(p.x+bitmap.xshift()), vsf*(p.y+bitmap.yshift()));
for (int i=0; i < path->curve.n; i++) {
if (path->curve.tag[i] == POTRACE_CURVETO) {
curveTo(hsf*(path->curve.c[i][0].x+bitmap.xshift()), vsf*(path->curve.c[i][0].y+bitmap.yshift()),
hsf*(path->curve.c[i][1].x+bitmap.xshift()), vsf*(path->curve.c[i][1].y+bitmap.yshift()),
hsf*(path->curve.c[i][2].x+bitmap.xshift()), vsf*(path->curve.c[i][2].y+bitmap.yshift()));
}
else {
lineTo(hsf*(path->curve.c[i][1].x+bitmap.xshift()), vsf*(path->curve.c[i][1].y+bitmap.yshift()));
if (i == path->curve.n-1)
closePath();
else
lineTo(hsf*(path->curve.c[i][2].x+bitmap.xshift()), vsf*(path->curve.c[i][2].y+bitmap.yshift()));
}
}
}
}
potrace_state_free(state);
}
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