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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 <tools/helpers.hxx>
#include <vcl/bitmap.hxx>
#include <vcl/bitmapex.hxx>
#include <vcl/BitmapEmbossGreyFilter.hxx>
#include <bitmap/BitmapWriteAccess.hxx>
#include <algorithm>
BitmapEx BitmapEmbossGreyFilter::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();
sal_Int32 nGrey11, nGrey12, nGrey13;
sal_Int32 nGrey21, nGrey22, nGrey23;
sal_Int32 nGrey31, nGrey32, nGrey33;
double fAzim = basegfx::deg2rad<100>(mnAzimuthAngle100);
double fElev = basegfx::deg2rad<100>(mnElevationAngle100);
std::unique_ptr<sal_Int32[]> pHMap(new sal_Int32[nWidth + 2]);
std::unique_ptr<sal_Int32[]> pVMap(new sal_Int32[nHeight + 2]);
sal_Int32 nX, nY, nNx, nNy, nDotL;
const sal_Int32 nLx = FRound(cos(fAzim) * cos(fElev) * 255.0);
const sal_Int32 nLy = FRound(sin(fAzim) * cos(fElev) * 255.0);
const sal_Int32 nLz = FRound(sin(fElev) * 255.0);
const auto nZ2 = ((6 * 255) / 4) * ((6 * 255) / 4);
const sal_Int32 nNzLz = ((6 * 255) / 4) * nLz;
const sal_uInt8 cLz
= static_cast<sal_uInt8>(std::clamp(nLz, sal_Int32(0), sal_Int32(255)));
// 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++)
{
nNx = nGrey11 + nGrey21 + nGrey31 - nGrey13 - nGrey23 - nGrey33;
nNy = nGrey31 + nGrey32 + nGrey33 - nGrey11 - nGrey12 - nGrey13;
if (!nNx && !nNy)
{
aGrey.SetIndex(cLz);
}
else if ((nDotL = nNx * nLx + nNy * nLy + nNzLz) < 0)
{
aGrey.SetIndex(0);
}
else
{
const double fGrey
= nDotL / sqrt(static_cast<double>(nNx * nNx + nNy * nNy + nZ2));
aGrey.SetIndex(static_cast<sal_uInt8>(std::clamp(fGrey, 0.0, 255.0)));
}
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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