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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 <vcl/bitmap.hxx>
#include <vcl/bitmapex.hxx>
#include <vcl/bitmapaccess.hxx>
#include <vcl/BitmapSobelGreyFilter.hxx>
#include <bitmapwriteaccess.hxx>
BitmapEx BitmapSobelGreyFilter::execute(BitmapEx const& rBitmapEx)
{
Bitmap aBitmap(rBitmapEx.GetBitmap());
bool bRet = aBitmap.ImplMakeGreyscales(256);
if (bRet)
{
bRet = false;
Bitmap::ScopedReadAccess pReadAcc(aBitmap);
if (pReadAcc)
{
Bitmap aNewBmp(aBitmap.GetSizePixel(), 8, &pReadAcc->GetPalette());
BitmapScopedWriteAccess pWriteAcc(aNewBmp);
if (pWriteAcc)
{
BitmapColor aGrey(sal_uInt8(0));
const long nWidth = pWriteAcc->Width();
const long nHeight = pWriteAcc->Height();
const long nMask111 = -1, nMask121 = 0, nMask131 = 1;
const long nMask211 = -2, nMask221 = 0, nMask231 = 2;
const long nMask311 = -1, nMask321 = 0, nMask331 = 1;
const long nMask112 = 1, nMask122 = 2, nMask132 = 1;
const long nMask212 = 0, nMask222 = 0, nMask232 = 0;
const long nMask312 = -1, nMask322 = -2, nMask332 = -1;
long nGrey11, nGrey12, nGrey13;
long nGrey21, nGrey22, nGrey23;
long nGrey31, nGrey32, nGrey33;
long* pHMap = new long[nWidth + 2];
long* pVMap = new long[nHeight + 2];
long 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<long>(
sqrt(static_cast<double>(nSum1 * nSum1 + nSum2 * nSum2)));
aGrey.SetIndex(~static_cast<sal_uInt8>(SAL_BOUND(nSum1, 0, 255)));
pWriteAcc->SetPixelOnData(pScanline, nX, aGrey);
if (nX < (nWidth - 1))
{
const long 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();
}
}
}
delete[] pHMap;
delete[] pVMap;
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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