1 files changed, 145 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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--- /dev/null
+++ b/src/trace/potrace/inkscape-potrace.h
@@ -0,0 +1,145 @@
+// 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_POTRACE_H__
+#define __INKSCAPE_POTRACE_H__
+
+#include <trace/trace.h>
+#include <potracelib.h>
+
+struct GrayMap_def;
+typedef GrayMap_def GrayMap;
+
+namespace Inkscape {
+
+namespace Trace {
+
+namespace Potrace {
+
+enum TraceType
+    {
+    TRACE_BRIGHTNESS,
+    TRACE_BRIGHTNESS_MULTI,
+    TRACE_CANNY,
+    TRACE_QUANT,
+    TRACE_QUANT_COLOR,
+    TRACE_QUANT_MONO,
+    // Used in tradedialog.cpp
+    AUTOTRACE_SINGLE,
+    AUTOTRACE_MULTI,
+    AUTOTRACE_CENTERLINE
+    };
+
+
+class PotraceTracingEngine : 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;
+
+    /**
+     *  This is the working method of this implementing class, and all
+     *  implementing classes.  Take a GdkPixbuf, trace it, and
+     *  return the path data that is compatible with the d="" attribute
+     *  of an SVG <path> element.
+     */
+    std::vector<TracingEngineResult> trace(
+                        Glib::RefPtr<Gdk::Pixbuf> pixbuf) override;
+
+    /**
+     *  Abort the thread that is executing getPathDataFromPixbuf()
+     */
+    void abort() override;
+
+    /**
+     *
+     */
+    Glib::RefPtr<Gdk::Pixbuf> preview(Glib::RefPtr<Gdk::Pixbuf> pixbuf);
+
+    /**
+     *
+     */
+    int keepGoing;
+
+    std::vector<TracingEngineResult>traceGrayMap(GrayMap *grayMap);
+
+    potrace_param_t *potraceParams;
+    TraceType traceType;
+
+    //## do I invert at the end?
+    bool invert;
+
+    //## Color-->b&w quantization
+    int quantizationNrColors;
+
+    //## brightness items
+    double brightnessThreshold;
+    double brightnessFloor; //usually 0.0
+
+    //## canny items
+    double cannyHighThreshold;
+
+    //## Color-->multiscan quantization
+    int multiScanNrColors;
+    bool multiScanStack; //do we tile or stack?
+    bool multiScanSmooth;//do we use gaussian filter?
+    bool multiScanRemoveBackground; //do we remove the bottom trace?
+    
+    private:
+    /**
+     * This is the actual wrapper of the call to Potrace.  nodeCount
+     * returns the count of nodes created.  May be NULL if ignored.
+     */
+    std::string grayMapToPath(GrayMap *gm, long *nodeCount);
+
+    std::vector<TracingEngineResult>traceBrightnessMulti(GdkPixbuf *pixbuf);
+    std::vector<TracingEngineResult>traceQuant(GdkPixbuf *pixbuf);
+    std::vector<TracingEngineResult>traceSingle(GdkPixbuf *pixbuf);
+
+
+};//class PotraceTracingEngine
+
+
+
+}  // namespace Potrace
+}  // namespace Trace
+}  // namespace Inkscape
+
+
+#endif  //__INKSCAPE_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 :