grayindex.h

barcode readers [ from Image]

//
// GrayIndex.h
//   Interface for indexing Rgb images using [row][col].
//
// 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 GrayIndex_h
#define GrayIndex_h

#include <e32cons.h>

namespace Core
{
	class IGrayIndex
	{
		// Lifecycle
	public:
		IGrayIndex(const CImage& image) :
			 inRowBytes(0),
			 ipData(NULL)
			{
				_LIT(LRGrayErr, "IGrayIndex: Not a byte gray image");
				__ASSERT_ALWAYS(image.iBitmap.DisplayMode() == EGray256, User::Panic(LRGrayErr, KErrGeneral));
				ipData = (unsigned char*) image.iBitmap.DataAddress();
				inRowBytes = image.iBitmap.ScanLineLength(image.iBitmap.SizeInPixels().iWidth, EGray256);
			}

			IGrayIndex() :
			 inRowBytes(0),
			 ipData(NULL)
		{}		


		inline ~IGrayIndex(void) 
		{
		};

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

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

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

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

};

#endif // GrayIndex_h