1 files changed, 140 insertions, 0 deletions
diff --git a/src/trace/potrace/inkscape-potrace.h b/src/trace/potrace/inkscape-potrace.h
new file mode 100644
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+++ b/src/trace/potrace/inkscape-potrace.h
@@ -0,0 +1,140 @@
+// 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 :