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trace.h

/**
 * A generic interface for plugging different
 *  autotracers into Inkscape.
 *
 * Authors:
 *   Bob Jamison <rjamison@titan.com>
 *
 * Copyright (C) 2004-2006 Bob Jamison
 *
 * Released under GNU GPL, read the file 'COPYING' for more information
 */
#ifndef __TRACE_H__
#define __TRACE_H__

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif

#ifdef HAVE_STRING_H
# include <string.h>
#endif

#include <gtkmm.h>

#include <vector>
#include <sp-shape.h>

struct SPImage;
struct SPItem;

namespace Inkscape {

namespace Trace {



/**
 *
 */
00044 class TracingEngineResult
{

public:

    /**
     *
     */
    TracingEngineResult(const std::string &theStyle,
                        const std::string &thePathData,
                        long theNodeCount)
        {
        style     = theStyle;
        pathData  = thePathData;
        nodeCount = theNodeCount;
        }

    TracingEngineResult(const TracingEngineResult &other)
        { assign(other); }

    virtual TracingEngineResult &operator=(const TracingEngineResult &other)
        { assign(other); return *this; }


    /**
     *
     */
    virtual ~TracingEngineResult()
        { }


    /**
     *
     */
    std::string getStyle()
        { return style; }

    /**
     *
     */
    std::string getPathData()
        { return pathData; }

    /**
     *
     */
    long getNodeCount()
        { return nodeCount; }

private:

    void assign(const TracingEngineResult &other)
        {
        style = other.style;
        pathData = other.pathData;
        nodeCount = other.nodeCount;
        }

    std::string style;

    std::string pathData;

    long nodeCount;

};



/**
 *
 */
00115 class TracingEngine
{

    public:

    /**
     *
     */
    TracingEngine()
        {}

    /**
     *
     */
    virtual ~TracingEngine()
        {}

    /**
     *  This is the working method of this interface, and all
     *  implementing classes.  Take a GdkPixbuf, trace it, and
     *  return a style attribute and the path data that is
     *  compatible with the d="" attribute
     *  of an SVG <path> element.
     */
00139     virtual  std::vector<TracingEngineResult> trace(
                           Glib::RefPtr<Gdk::Pixbuf> /*pixbuf*/)
        { std::vector<TracingEngineResult> dummy;  return dummy; }


    /**
     *  Abort the thread that is executing getPathDataFromPixbuf()
     */
00147     virtual void abort()
        {}



};//class TracingEngine









/**
 *  This simple class allows a generic wrapper around a given
 *  TracingEngine object.  Its purpose is to provide a gateway
 *  to a variety of tracing engines, while maintaining a
 *  consistent interface.
 */
00168 class Tracer
{

public:


    /**
     *
     */
    Tracer()
        {
        engine       = NULL;
        sioxEnabled  = false;
        }



    /**
     *
     */
    ~Tracer()
        {}


    /**
     *  A convenience method to allow other software to 'see' the
     *  same image that this class sees.
     */
    Glib::RefPtr<Gdk::Pixbuf> getSelectedImage();

    /**
     * This is the main working method.  Trace the selected image, if
     * any, and create a <path> element from it, inserting it into
     * the current document.
     */
    void trace(TracingEngine *engine);


    /**
     *  Abort the thread that is executing convertImageToPath()
     */
    void abort();

    /**
     *  Whether we want to enable SIOX subimage selection
     */
    void enableSiox(bool enable);


private:

    /**
     * This is the single path code that is called by its counterpart above.
     */
    void traceThread();

    /**
     * This is true during execution. Setting it to false (like abort()
     * does) should inform the threaded code that it needs to stop
     */
00228     bool keepGoing;

    /**
     *  During tracing, this is Non-null, and refers to the
     *  engine that is currently doing the tracing.
     */
00234     TracingEngine *engine;

    SPImage *getSelectedSPImage();

    std::vector<SPShape *> sioxShapes;

    bool sioxEnabled;

    Glib::RefPtr<Gdk::Pixbuf> sioxProcessImage(
           SPImage *img, Glib::RefPtr<Gdk::Pixbuf> origPixbuf);

    Glib::RefPtr<Gdk::Pixbuf> lastSioxPixbuf;
    Glib::RefPtr<Gdk::Pixbuf> lastOrigPixbuf;

};//class Tracer




} // namespace Trace

} // namespace Inkscape



#endif //__TRACE_H__

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