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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 <sal/config.h>
#include <vcl/bitmap.hxx>
#include <vcl/bitmapex.hxx>
#include <vcl/BitmapSobelGreyFilter.hxx>
#include <bitmap/BitmapWriteAccess.hxx>
#include <algorithm>
BitmapEx BitmapSobelGreyFilter::execute(BitmapEx const& rBitmapEx) const
{
Bitmap aBitmap(rBitmapEx.GetBitmap());
bool bRet = aBitmap.ImplMakeGreyscales();
if (bRet)
{
bRet = false;
Bitmap::ScopedReadAccess pReadAcc(aBitmap);
if (pReadAcc)
{
Bitmap aNewBmp(aBitmap.GetSizePixel(), vcl::PixelFormat::N8_BPP,
&pReadAcc->GetPalette());
BitmapScopedWriteAccess pWriteAcc(aNewBmp);
if (pWriteAcc)
{
BitmapColor aGrey(sal_uInt8(0));
const sal_Int32 nWidth = pWriteAcc->Width();
const sal_Int32 nHeight = pWriteAcc->Height();
const sal_Int32 nMask111 = -1, nMask121 = 0, nMask131 = 1;
const sal_Int32 nMask211 = -2, nMask221 = 0, nMask231 = 2;
const sal_Int32 nMask311 = -1, nMask321 = 0, nMask331 = 1;
const sal_Int32 nMask112 = 1, nMask122 = 2, nMask132 = 1;
const sal_Int32 nMask212 = 0, nMask222 = 0, nMask232 = 0;
const sal_Int32 nMask312 = -1, nMask322 = -2, nMask332 = -1;
sal_Int32 nGrey11, nGrey12, nGrey13;
sal_Int32 nGrey21, nGrey22, nGrey23;
sal_Int32 nGrey31, nGrey32, nGrey33;
std::unique_ptr<long[]> pHMap(new long[nWidth + 2]);
std::unique_ptr<long[]> pVMap(new long[nHeight + 2]);
sal_Int32 nX, nY, nSum1, nSum2;
// fill mapping tables
pHMap[0] = 0;
for (nX = 1; nX <= nWidth; nX++)
{
pHMap[nX] = nX - 1;
}
pHMap[nWidth + 1] = nWidth - 1;
pVMap[0] = 0;
for (nY = 1; nY <= nHeight; nY++)
{
pVMap[nY] = nY - 1;
}
pVMap[nHeight + 1] = nHeight - 1;
for (nY = 0; nY < nHeight; nY++)
{
nGrey11 = pReadAcc->GetPixel(pVMap[nY], pHMap[0]).GetIndex();
nGrey12 = pReadAcc->GetPixel(pVMap[nY], pHMap[1]).GetIndex();
nGrey13 = pReadAcc->GetPixel(pVMap[nY], pHMap[2]).GetIndex();
nGrey21 = pReadAcc->GetPixel(pVMap[nY + 1], pHMap[0]).GetIndex();
nGrey22 = pReadAcc->GetPixel(pVMap[nY + 1], pHMap[1]).GetIndex();
nGrey23 = pReadAcc->GetPixel(pVMap[nY + 1], pHMap[2]).GetIndex();
nGrey31 = pReadAcc->GetPixel(pVMap[nY + 2], pHMap[0]).GetIndex();
nGrey32 = pReadAcc->GetPixel(pVMap[nY + 2], pHMap[1]).GetIndex();
nGrey33 = pReadAcc->GetPixel(pVMap[nY + 2], pHMap[2]).GetIndex();
Scanline pScanline = pWriteAcc->GetScanline(nY);
for (nX = 0; nX < nWidth; nX++)
{
nSum1 = nSum2 = 0;
nSum1 += nMask111 * nGrey11;
nSum2 += nMask112 * nGrey11;
nSum1 += nMask121 * nGrey12;
nSum2 += nMask122 * nGrey12;
nSum1 += nMask131 * nGrey13;
nSum2 += nMask132 * nGrey13;
nSum1 += nMask211 * nGrey21;
nSum2 += nMask212 * nGrey21;
nSum1 += nMask221 * nGrey22;
nSum2 += nMask222 * nGrey22;
nSum1 += nMask231 * nGrey23;
nSum2 += nMask232 * nGrey23;
nSum1 += nMask311 * nGrey31;
nSum2 += nMask312 * nGrey31;
nSum1 += nMask321 * nGrey32;
nSum2 += nMask322 * nGrey32;
nSum1 += nMask331 * nGrey33;
nSum2 += nMask332 * nGrey33;
nSum1 = static_cast<sal_Int32>(
sqrt(static_cast<double>(nSum1 * nSum1 + nSum2 * nSum2)));
aGrey.SetIndex(~static_cast<sal_uInt8>(
std::clamp(nSum1, sal_Int32(0), sal_Int32(255))));
pWriteAcc->SetPixelOnData(pScanline, nX, aGrey);
if (nX < (nWidth - 1))
{
const sal_Int32 nNextX = pHMap[nX + 3];
nGrey11 = nGrey12;
nGrey12 = nGrey13;
nGrey13 = pReadAcc->GetPixel(pVMap[nY], nNextX).GetIndex();
nGrey21 = nGrey22;
nGrey22 = nGrey23;
nGrey23 = pReadAcc->GetPixel(pVMap[nY + 1], nNextX).GetIndex();
nGrey31 = nGrey32;
nGrey32 = nGrey33;
nGrey33 = pReadAcc->GetPixel(pVMap[nY + 2], nNextX).GetIndex();
}
}
}
pHMap.reset();
pVMap.reset();
pWriteAcc.reset();
bRet = true;
}
pReadAcc.reset();
if (bRet)
{
const MapMode aMap(aBitmap.GetPrefMapMode());
const Size aPrefSize(aBitmap.GetPrefSize());
aBitmap = aNewBmp;
aBitmap.SetPrefMapMode(aMap);
aBitmap.SetPrefSize(aPrefSize);
}
}
}
if (bRet)
return BitmapEx(aBitmap);
return BitmapEx();
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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