rgbindex.h

barcode readers [ from Image]

//
// RgbIndex.h
//   Interface for indexing Rgb images using [row][col][R,G,B].
//   Usage is
//      (In derived class definition) : public IRgbIndex
//		(In derived class constructor)  : IRgbIndex(<pointer to memory area>,<Columns>)
//      The class will then support indexing by [row][col][Rgbval]
//
// Copyright (C) 2003, 2006 by Jon A. Webb (Contact via GMail; username is jonawebb)
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// 
// This library 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
// Lesser General Public License for more details.
// 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//

#ifndef RgbIndex_h
#define RgbIndex_h

#include <e32cons.h>
#include <fbs.h>

namespace Core
{
	typedef enum { // these are as color images are layed out for DisplayMode == EColor16M
		R = 2,
		G = 1,
		B = 0
	} TRgbVal;

	// postfix ++
	inline TRgbVal operator++(TRgbVal& c, int) {
		int nC = int(c);
		c = TRgbVal(nC+1);
		return TRgbVal(nC);
	}

	// prefix ++
	inline TRgbVal operator++(TRgbVal& c) {
		c = TRgbVal(int(c)+1);
		return c;
	}

	class RTwoDRgbIndex
	{
		friend class IRgbIndex;
		// Lifecycle
	protected:
		inline RTwoDRgbIndex(unsigned char* pData) :
			ipData(pData)
			{}
	public:
		inline ~RTwoDRgbIndex() {};

		// Operators
	public:
		inline const unsigned char* operator[](unsigned int nCol) const {
			return ipData + nCol * 3;
		}
		inline unsigned char* operator[](unsigned int nCol) {
			return ipData + nCol * 3;
		}

	private:
		// Attributes
		unsigned char* ipData;
	};

	class IRgbIndex
	{
		// Lifecycle
	public:
		inline IRgbIndex(const CImage& image) :
			inRowBytes(0),
			ipData(NULL)
			{
				_LIT(LRgbErr, "IRgbIndex: Not a color 24-bit image");
				__ASSERT_ALWAYS(image.iBitmap.DisplayMode() == EColor16M, User::Panic(LRgbErr, KErrGeneral));
				ipData = (unsigned char*) image.iBitmap.DataAddress();
				inRowBytes = CFbsBitmap::ScanLineLength(image.iBitmap.SizeInPixels().iWidth, EColor16M);
			}

		inline IRgbIndex(const IRgbIndex& other) 
		{
			ipData = other.ipData;
			inRowBytes = other.inRowBytes;
		}

		inline ~IRgbIndex(void) 
		{
		};

		// Operators
	public:
		inline IRgbIndex& operator=(const IRgbIndex& other) {
			if (this != &other) {
				inRowBytes = other.inRowBytes;
				ipData = other.ipData;
			}
			return *this;
		}

		inline const RTwoDRgbIndex operator[](unsigned int nRow) const {
			return RTwoDRgbIndex(ipData + nRow*inRowBytes);
		}

		inline RTwoDRgbIndex operator[](unsigned int nRow) {
			return RTwoDRgbIndex(ipData + nRow*inRowBytes);
		}

	private:
		// Attributes
		unsigned int inRowBytes;
		unsigned char* ipData;
	};

};

#endif // RgbIndex_h