multiply.cpp

来自「barcode readers [ from Image]」· C++ 代码 · 共 90 行

//
// Multiply
//   Multiplies an image by a constant
//
// Copyright (C) 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
//

#include "Multiply.h"

#include "Debug.h"
#include "GrayImageIter.h"
#include "GrayIndex.h"
#include "Image.h"
#include "ImageSize.h"
#include "Replicate.h"

#include <e32std.h>
#include <fbs.h>

using namespace Core;

namespace Algorithm
{

	EXPORT_C CMultiply* CMultiply::NewL(int multplier)
	{	
		return new (ELeave) CMultiply(multplier);	
	}

	CMultiply::~CMultiply()
	{
	}

	CMultiply::CMultiply(int multiplier) :
		ibEmpty(true),
		inMultiplier(multiplier)
	{
	}

	CImage CMultiply::FrontL() 
	{
		if (ibEmpty) {
			User::Leave(KErrGeneral);
			return CImage();
		}
		ibEmpty = true;
		return iImage;
	}

	void CMultiply::PushL(CImage image)
	{
		image.LockLC();
		IGrayImageIter it(image);
		for (it.Reset(); !it.End(); it.NextRow()) {
			for (; !it.REnd(); it++) {
				int val = it() * inMultiplier;
				if (val > 255) {
					it() = 255;
				} else {
					it() = (unsigned char) val;
				}
			}
		}
		CleanupStack::PopAndDestroy(); // unlock bitmaps
		iImage = image;
		CDebug::ShowImage(iImage);
		ibEmpty = false;
	}

	bool CMultiply::Empty() const
	{
		return ibEmpty;
	}

};