/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * 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 2
 * 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, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#ifndef __FREESTYLE_CANVAS_H__
#define __FREESTYLE_CANVAS_H__

/** \file blender/freestyle/intern/stroke/Canvas.h
 *  \ingroup freestyle
 *  \brief Class to define a canvas designed to draw style modules
 *  \author Stephane Grabli
 *  \date 20/10/2002
 */

#include <cstring>
#include <deque>
#include <map>
#include <vector>

#include "StrokeLayer.h"

#include "../geometry/BBox.h"
#include "../geometry/Geom.h"

#include "../system/FreestyleConfig.h"

namespace Freestyle {

using namespace Geometry;

struct ltstr
{
	bool operator()(const char *s1, const char *s2) const
	{
		return strcmp(s1, s2) < 0;
	}
};

class InformationMap;
class StrokeRenderer;
class ViewMap;
class ViewEdge;
class FEdge;
class RGBImage;
class GrayImage;
class QImage;
class ImagePyramid;
class SteerableViewMap;
class StyleModule;

/*! Class to define the canvas on which strokes are drawn.
 *  It's used to store state information about the drawing.
 */
class LIB_STROKE_EXPORT Canvas
{
public:
	/*! Returns a pointer on the Canvas instance */
	static Canvas *getInstance()
	{
		return _pInstance;
	}

	typedef std::map<const char *, ImagePyramid *, ltstr> mapsMap;
	static const int NB_STEERABLE_VIEWMAP = 5;

protected:
	static Canvas *_pInstance;
	std::deque<StrokeLayer*> _Layers;
	std::deque<StyleModule*> _StyleModules;
	FEdge *_SelectedFEdge;

	StrokeRenderer *_Renderer;
	StyleModule *_current_sm;
	mapsMap _maps;
	static const char *_MapsPath;
	SteerableViewMap *_steerableViewMap;
	bool _basic;

public:
	/* Builds the Canvas */
	Canvas();
	/* Copy constructor */
	Canvas(const Canvas& iBrother);
	/* Destructor */
	virtual ~Canvas();

	/* operations that need to be done before a draw */
	virtual void preDraw();

	/* Draw the canvas using the current shader */
	virtual void Draw();

	/* operations that need to be done after a draw */
	virtual void postDraw();

	/* Renders the created strokes */
	virtual void Render(const StrokeRenderer *iRenderer);
	/* Basic Renders the created strokes */
	virtual void RenderBasic(const StrokeRenderer *iRenderer);
	/* Renders a stroke */
	virtual void RenderStroke(Stroke *iStroke) = 0;

	/* init the canvas */
	virtual void init() = 0;

	/* Clears the Canvas (shaders stack, layers stack...) */
	void Clear();

	/* Erases the layers */
	virtual void Erase(); 

	/* Reads a pixel area from the canvas */
	virtual void readColorPixels(int x, int y, int w, int h, RGBImage& oImage) const = 0;
	/* Reads a depth pixel area from the canvas */
	virtual void readDepthPixels(int x, int y, int w, int h, GrayImage& oImage) const = 0;

	/* update the canvas (display) */
	virtual void update() = 0;

	/* checks whether the canvas is empty or not */
	bool isEmpty() const
	{
		return (_Layers.empty());
	}

	/* Maps management */
	/*! Loads an image map. The map will be scaled (without preserving the ratio in order to fit the actual
	 *  canvas size.).
	 *  The image must be a gray values image...
	 *  \param iFileName
	 *    The name of the image file
	 *  \param iMapName
	 *    The name that will be used to access this image
	 *  \param iNbLevels
	 *    The number of levels in the map pyramid. (default = 4).
	 *    If iNbLevels == 0, the complete pyramid is built.
	 */
	void loadMap(const char *iFileName, const char *iMapName, unsigned iNbLevels = 4, float iSigma = 1.0f);

	/*! Reads a pixel value in a map.
	 *  Returns a value between 0 and 1.
	 *  \param iMapName
	 *    The name of the map
	 *  \param level
	 *    The level of the pyramid from which the pixel must be read.
	 *  \param x
	 *    The abscissa of the desired pixel specified in level0 coordinate system. The origin is the lower left corner.
	 *  \param y
	 *    The ordinate of the desired pixel specified in level0 coordinate system. The origin is the lower left corner.
	 */
	float readMapPixel(const char *iMapName, int level, int x, int y);

	/*! Sets the steerable viewmap */
	void loadSteerableViewMap(SteerableViewMap *iSVM)
	{
		_steerableViewMap = iSVM;
	}

	/*! Returns the steerable VM */
	SteerableViewMap *getSteerableViewMap()
	{
		return _steerableViewMap;
	}

	/*! accessors */
	inline const FEdge *selectedFEdge() const
	{
		return _SelectedFEdge;
	}

	inline FEdge *selectedFEdge()
	{
		return _SelectedFEdge;
	}

	virtual int width() const = 0;
	virtual int height() const = 0;
	virtual BBox<Vec3r> scene3DBBox() const = 0;

	inline const StrokeRenderer *renderer() const
	{
		return _Renderer;
	}

	inline StyleModule *getCurrentStyleModule()
	{
		return _current_sm;
	}

	virtual bool getRecordFlag() const
	{
		return false;
	}

	int stroke_count;

	/*! modifiers */
	inline void setSelectedFEdge(FEdge *iFEdge)
	{
		_SelectedFEdge = iFEdge;
	}

	/*! inserts a shader at pos index+1 */
	void PushBackStyleModule(StyleModule *iStyleModule);
	void InsertStyleModule(unsigned index, StyleModule *iStyleModule);
	void RemoveStyleModule(unsigned index);
	void SwapStyleModules(unsigned i1, unsigned i2);
	void ReplaceStyleModule(unsigned index, StyleModule *iStyleModule);
	void setVisible(unsigned index, bool iVisible) ;

#if 0
	inline void setDensityMap(InformationMap<RGBImage> *iMap)
	{
		_DensityMap = iMap;
	}
#endif

	inline void AddLayer(StrokeLayer *iLayer)
	{
		_Layers.push_back(iLayer);
	}

	void resetModified(bool iMod = false);
	void causalStyleModules(std::vector<unsigned>& vec, unsigned index = 0);
	void setModified(unsigned index, bool b);
};

} /* namespace Freestyle */

#endif // __FREESTYLE_CANVAS_H__