haiku/headers/private/servers/app/PatternHandler.h

//------------------------------------------------------------------------------
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//	File Name:		PatternHandler.h
//	Author:			DarkWyrm <bpmagic@columbus.rr.com>
//					Stephan Aßmus <superstippi@gmx.de>
//	Description:	Class for easy calculation and use of patterns
//  
//------------------------------------------------------------------------------
#ifndef PATTERNHANDLER_H
#define PATTERNHANDLER_H

#include <string.h>
#include <GraphicsDefs.h>
#include "RGBColor.h"

class Pattern {
 public:

								Pattern(void) {} 

								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; }

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

	inline	uint64				GetInt64(void) const
									{ return 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; }
 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 RGBColor& high, const RGBColor& low);
			void				SetHighColor(const RGBColor& color);
			void				SetLowColor(const RGBColor& color);

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


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

			RGBColor			ColorAt(const BPoint& pt) const;
			RGBColor			ColorAt(float x, float y) const;
	inline	RGBColor			ColorAt(int x, int y) const;
	// TODO: any ideas for a better name of the rgb_color version of this function?
	inline	rgb_color			R5ColorAt(int x, int y) const;

			bool				IsHighColor(const BPoint& pt) const;
	inline	bool				IsHighColor(int x, int y) const;

			const pattern*		GetR5Pattern(void) const
									{ return (const pattern*)fPattern.GetInt8(); }
 private:
			Pattern				fPattern;
			RGBColor			fHighColor;
			RGBColor			fLowColor;
};

/*!
	\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	RGBColor
PatternHandler::ColorAt(int x, int y) const
{
	return IsHighColor(x, y) ? fHighColor : fLowColor;
}

/*!
	\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::R5ColorAt(int x, int y) const
{
	return IsHighColor(x, y) ? fHighColor.GetColor32() : fLowColor.GetColor32();
}

/*!
	\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
{
	// TODO: Does this work correctly for
	// negative coordinates?!?
	const int8* ptr = fPattern.GetInt8();
	int32 value = ptr[y % 8] & (1 << (7 - (x % 8)) );
	
	return (value == 0) ? false : true;
	
}

#endif