e5012e53b9
extracts code from the innermost part of fairly hot loops And add a GetIndexFromData method to make the call sites a little easier to read. Change-Id: I4ce5c5a687ecdb6982562a0aafce8513d86f9107 Reviewed-on: https://gerrit.libreoffice.org/49337 Tested-by: Jenkins <ci@libreoffice.org> Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
85 lines
2.4 KiB
C++
85 lines
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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*/
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#include <BitmapSymmetryCheck.hxx>
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BitmapSymmetryCheck::BitmapSymmetryCheck()
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{}
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BitmapSymmetryCheck::~BitmapSymmetryCheck()
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{}
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bool BitmapSymmetryCheck::check(Bitmap& rBitmap)
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{
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Bitmap::ScopedReadAccess aReadAccess(rBitmap);
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return checkImpl(aReadAccess.get());
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}
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bool BitmapSymmetryCheck::checkImpl(BitmapReadAccess const * pReadAccess)
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{
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long nHeight = pReadAccess->Height();
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long nWidth = pReadAccess->Width();
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long nHeightHalf = nHeight / 2;
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long nWidthHalf = nWidth / 2;
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bool bHeightEven = (nHeight % 2) == 0;
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bool bWidthEven = (nWidth % 2) == 0;
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for (long y = 0; y < nHeightHalf; ++y)
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{
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Scanline pScanlineRead = pReadAccess->GetScanline( y );
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Scanline pScanlineRead2 = pReadAccess->GetScanline( nHeight - y - 1 );
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for (long x = 0; x < nWidthHalf; ++x)
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{
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if (pReadAccess->GetPixelFromData(pScanlineRead, x) != pReadAccess->GetPixelFromData(pScanlineRead2, x))
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{
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return false;
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}
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if (pReadAccess->GetPixelFromData(pScanlineRead, x) != pReadAccess->GetPixelFromData(pScanlineRead, nWidth - x - 1))
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{
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return false;
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}
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if (pReadAccess->GetPixelFromData(pScanlineRead, x) != pReadAccess->GetPixelFromData(pScanlineRead2, nWidth - x - 1))
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{
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return false;
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}
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}
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}
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if (bWidthEven)
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{
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for (long y = 0; y < nHeightHalf; ++y)
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{
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if (pReadAccess->GetPixel(y, nWidthHalf) != pReadAccess->GetPixel(nHeight - y - 1, nWidthHalf))
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{
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return false;
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}
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}
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}
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if (bHeightEven)
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{
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Scanline pScanlineRead = pReadAccess->GetScanline( nHeightHalf );
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for (long x = 0; x < nWidthHalf; ++x)
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{
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if (pReadAccess->GetPixelFromData(pScanlineRead, x) != pReadAccess->GetPixelFromData(pScanlineRead, nWidth - x - 1))
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{
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return false;
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}
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}
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}
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return true;
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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