/*
 * Copyright (c) 2001-2007, Haiku, Inc.
 * Distributed under the terms of the MIT license.
 *
 * Author:      DarkWyrm <bpmagic@columbus.rr.com>
 *                      Stephan Aßmus <superstippi@gmx.de>
 */
#ifndef PATTERNHANDLER_H
#define PATTERNHANDLER_H


#include <stdio.h>
#include <string.h>

#include <GraphicsDefs.h>

class BPoint;


class Pattern {
 public:

                                                                Pattern() {} 

                                                                Pattern(const uint64& p)
                                                                        { fPattern.type64 = p; }

                                                                Pattern(const int8* p)
                                                                        { fPattern.type64 = *((const uint64*)p); }
        
                                                                Pattern(const Pattern& src)
                                                                        { fPattern.type64 = src.fPattern.type64; }

                                                                Pattern(const pattern& src)
                                                                        { fPattern.type64 = *(uint64*)src.data; }

        inline  const int8*                     GetInt8() const
                                                                        { return fPattern.type8; }

        inline  uint64                          GetInt64() const
                                                                        { return fPattern.type64; }

        inline  const ::pattern&        GetPattern() const
                                                                        { return *(const ::pattern*)&fPattern.type64; }

        inline  void                            Set(const int8* p)
                                                                        { fPattern.type64 = *((const uint64*)p); }

        inline  void                            Set(const uint64& p)
                                                                        { fPattern.type64 = p; }

                        Pattern&                        operator=(const Pattern& from)
                                                                        { fPattern.type64 = from.fPattern.type64; return *this; }

                        Pattern&                        operator=(const int64 &from)
                                                                        { fPattern.type64 = from; return *this; }

                        Pattern&                        operator=(const pattern &from)
                                                                        { memcpy(&fPattern.type64, &from, sizeof(pattern)); return *this; }

                        bool                            operator==(const Pattern& other) const
                                                                        { return fPattern.type64 == other.fPattern.type64; }

                        bool                            operator==(const pattern& other) const
                                                                        { return fPattern.type64 == *(uint64*)other.data; }

 private:

        typedef union
        {
                uint64  type64;
                int8    type8[8];
        } pattern_union;

                        pattern_union           fPattern;
};

extern const Pattern kSolidHigh;
extern const Pattern kSolidLow;
extern const Pattern kMixedColors;

/*!
        \brief Class for easy calculation and use of patterns
        
        PatternHandlers are designed specifically for DisplayDriver subclasses. 
        Pattern support can be easily added by setting the pattern to use via 
        SetTarget, and then merely retrieving the value for the coordinates 
        specified. 
*/
class PatternHandler {
 public:
                                                                PatternHandler(void);
                                                                PatternHandler(const int8* p);
                                                                PatternHandler(const uint64& p);
                                                                PatternHandler(const Pattern& p);
                                                                PatternHandler(const PatternHandler& other);
        virtual                                         ~PatternHandler(void);

                        void                            SetPattern(const int8* p);
                        void                            SetPattern(const uint64& p);
                        void                            SetPattern(const Pattern& p);
                        void                            SetPattern(const pattern& p);

                        void                            SetColors(const rgb_color& high,
                                                                        const rgb_color& low);
                        void                            SetHighColor(const rgb_color& color);
                        void                            SetLowColor(const rgb_color& color);

                        rgb_color                       HighColor() const
                                                                        { return fHighColor; }
                        rgb_color                       LowColor() const
                                                                        { return fLowColor; }

                        rgb_color                       ColorAt(const BPoint& pt) const;
                        rgb_color                       ColorAt(float x, float y) const;
        inline  rgb_color                       ColorAt(int x, int y) const;

                        bool                            IsHighColor(const BPoint& pt) const;
        inline  bool                            IsHighColor(int x, int y) const;
        inline  bool                            IsSolidHigh() const
                                                                        { return fPattern == B_SOLID_HIGH; }
        inline  bool                            IsSolidLow() const
                                                                        { return fPattern == B_SOLID_LOW; }
        inline  bool                            IsSolid() const
                                                                        { return IsSolidHigh() || IsSolidLow(); }

                        const pattern*          GetR5Pattern(void) const
                                                                        { return (const pattern*)fPattern.GetInt8(); }
                        const Pattern&          GetPattern(void) const
                                                                        { return fPattern; }

                        void                            SetOffsets(int32 x, int32 y);

 private:
                        Pattern                         fPattern;
                        rgb_color                       fHighColor;
                        rgb_color                       fLowColor;

                        uint16                          fXOffset;
                        uint16                          fYOffset;
};

/*!
        \brief Obtains the color in the pattern at the specified coordinates
        \param x X coordinate to get the color for
        \param y Y coordinate to get the color for
        \return Color for the coordinates
*/
inline rgb_color
PatternHandler::ColorAt(int x, int y) const
{
        return IsHighColor(x, y) ? fHighColor : fLowColor;
}

/*!
        \brief Obtains the value of the pattern at the specified coordinates
        \param pt Coordinates to get the value for
        \return Value for the coordinates - true if high, false if low.
*/

inline bool
PatternHandler::IsHighColor(int x, int y) const
{
        x -= fXOffset;
        y -= fYOffset;
        const int8* ptr = fPattern.GetInt8();
        int32 value = ptr[y & 7] & (1 << (7 - (x & 7)) );
        
        return value != 0;
}

#endif