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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* This is the C++ glue between Inkscape and Potrace
*
* Authors:
* Bob Jamison <rjamison@titan.com>
* Stéphane Gimenez <dev@gim.name>
*
* Copyright (C) 2004-2006 Authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*
* Potrace, the wonderful tracer located at http://potrace.sourceforge.net,
* is provided by the generosity of Peter Selinger, to whom we are grateful.
*
*/
#ifndef INKSCAPE_TRACE_POTRACE_H
#define INKSCAPE_TRACE_POTRACE_H
#include <optional>
#include <unordered_set>
#include <boost/functional/hash.hpp>
#include <2geom/point.h>
#include <2geom/path-sink.h>
#include "trace/trace.h"
#include "trace/imagemap.h"
using potrace_param_t = struct potrace_param_s;
using potrace_path_t = struct potrace_path_s;
namespace Inkscape {
namespace Trace {
namespace Potrace {
enum class TraceType
{
BRIGHTNESS,
BRIGHTNESS_MULTI,
CANNY,
QUANT,
QUANT_COLOR,
QUANT_MONO,
// Used in tracedialog.cpp
AUTOTRACE_SINGLE,
AUTOTRACE_MULTI,
AUTOTRACE_CENTERLINE
};
// Todo: Make lib2geom types hashable.
struct geom_point_hash
{
std::size_t operator()(Geom::Point const &pt) const
{
std::size_t hash = 0;
boost::hash_combine(hash, pt.x());
boost::hash_combine(hash, pt.y());
return hash;
}
};
class PotraceTracingEngine final
: public TracingEngine
{
public:
PotraceTracingEngine();
PotraceTracingEngine(TraceType traceType,
bool invert,
int quantizationNrColors,
double brightnessThreshold,
double brightnessFloor,
double cannyHighThreshold,
int multiScanNrColors,
bool multiScanStack,
bool multiScanSmooth ,
bool multiScanRemoveBackground);
~PotraceTracingEngine() override;
TraceResult trace(Glib::RefPtr<Gdk::Pixbuf> const &pixbuf, Async::Progress<double> &progress) override;
Glib::RefPtr<Gdk::Pixbuf> preview(Glib::RefPtr<Gdk::Pixbuf> const &pixbuf) override;
TraceResult traceGrayMap(GrayMap const &grayMap, Async::Progress<double> &progress);
void setOptiCurve(int);
void setOptTolerance(double);
void setAlphaMax(double);
void setTurdSize(int);
private:
potrace_param_t *potraceParams;
TraceType traceType = TraceType::BRIGHTNESS;
// Whether the image should be inverted at the end.
bool invert = false;
// Color -> b&w quantization
int quantizationNrColors = 8;
// Brightness items
double brightnessThreshold = 0.45;
double brightnessFloor = 0.0;
// Canny items
double cannyHighThreshold = 0.65;
// Color -> multiscan quantization
int multiScanNrColors = 8;
bool multiScanStack = true; // do we tile or stack?
bool multiScanSmooth = false; // do we use gaussian filter?
bool multiScanRemoveBackground = false; // do we remove the bottom trace?
void common_init();
TraceResult traceQuant (Glib::RefPtr<Gdk::Pixbuf> const &pixbuf, Async::Progress<double> &progress);
TraceResult traceBrightnessMulti(Glib::RefPtr<Gdk::Pixbuf> const &pixbuf, Async::Progress<double> &progress);
TraceResult traceSingle (Glib::RefPtr<Gdk::Pixbuf> const &pixbuf, Async::Progress<double> &progress);
IndexedMap filterIndexed(Glib::RefPtr<Gdk::Pixbuf> const &pixbuf) const;
std::optional<GrayMap> filter(Glib::RefPtr<Gdk::Pixbuf> const &pixbuf) const;
Geom::PathVector grayMapToPath(GrayMap const &gm, Async::Progress<double> &progress);
void writePaths(potrace_path_t *paths, Geom::PathBuilder &builder, std::unordered_set<Geom::Point, geom_point_hash> &points, Async::Progress<double> &progress) const;
};
} // namespace Potrace
} // namespace Trace
} // namespace Inkscape
#endif // INKSCAPE_TRACE_POTRACE_H
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
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