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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
*/
#include <BitmapSymmetryCheck.hxx>
BitmapSymmetryCheck::BitmapSymmetryCheck()
{}
BitmapSymmetryCheck::~BitmapSymmetryCheck()
{}
bool BitmapSymmetryCheck::check(Bitmap& rBitmap)
{
Bitmap::ScopedReadAccess aReadAccess(rBitmap);
return checkImpl(aReadAccess.get());
}
bool BitmapSymmetryCheck::checkImpl(BitmapReadAccess const * pReadAccess)
{
long nHeight = pReadAccess->Height();
long nWidth = pReadAccess->Width();
long nHeightHalf = nHeight / 2;
long nWidthHalf = nWidth / 2;
bool bHeightEven = (nHeight % 2) == 0;
bool bWidthEven = (nWidth % 2) == 0;
for (long y = 0; y < nHeightHalf; ++y)
{
Scanline pScanlineRead = pReadAccess->GetScanline( y );
Scanline pScanlineRead2 = pReadAccess->GetScanline( nHeight - y - 1 );
for (long x = 0; x < nWidthHalf; ++x)
{
if (pReadAccess->GetPixelFromData(pScanlineRead, x) != pReadAccess->GetPixelFromData(pScanlineRead2, x))
{
return false;
}
if (pReadAccess->GetPixelFromData(pScanlineRead, x) != pReadAccess->GetPixelFromData(pScanlineRead, nWidth - x - 1))
{
return false;
}
if (pReadAccess->GetPixelFromData(pScanlineRead, x) != pReadAccess->GetPixelFromData(pScanlineRead2, nWidth - x - 1))
{
return false;
}
}
}
if (bWidthEven)
{
for (long y = 0; y < nHeightHalf; ++y)
{
if (pReadAccess->GetPixel(y, nWidthHalf) != pReadAccess->GetPixel(nHeight - y - 1, nWidthHalf))
{
return false;
}
}
}
if (bHeightEven)
{
Scanline pScanlineRead = pReadAccess->GetScanline( nHeightHalf );
for (long x = 0; x < nWidthHalf; ++x)
{
if (pReadAccess->GetPixelFromData(pScanlineRead, x) != pReadAccess->GetPixelFromData(pScanlineRead, nWidth - x - 1))
{
return false;
}
}
}
return true;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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