crop.cpp

来自「barcode readers [ from Image]」· C++ 代码 · 共 100 行

//
// Crop
//   Crop image to rectangle.
//
// 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 "Crop.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 CCrop* CCrop::NewL(TRect rect)
	{	
		return new (ELeave) CCrop(rect);	
	}

	CCrop::~CCrop()
	{
	}

	CCrop::CCrop(TRect rect) :
		ibEmpty(true),
		iRect(rect)
	{
	}

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

	void CCrop::PushL(CImage image)
	{
		// now create the cropped image
		CImage imageCropped = CImage::NewL(iRect.Size(), EGray256);

		image.LockLC();
		// create an indexer for the input -- this also 
		// verifies that it is gray
		IGrayIndex itIn(image);

		// iterator over output image
		IGrayImageIter itOut(imageCropped);

		int i;
		for (i=iRect.iTl.iY; i<iRect.iBr.iY; i++, itOut.NextRow()) {
			Mem::Copy(
				(TAny*) &itOut(), 
				(TAny*) &itIn[i][iRect.iTl.iX], 
				iRect.iBr.iX-iRect.iTl.iX);
		}
		CleanupStack::PopAndDestroy(); // unlock bitmaps
		iImage = imageCropped;
		CDebug::ShowImage(iImage);
		ibEmpty = false;
	}

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

	void CCrop::SetRectangle(TRect rect) 
	{
		iRect = rect;
	}
};