diff options
Diffstat (limited to 'vcl/source/bitmap/BitmapEmbossGreyFilter.cxx')
| -rw-r--r-- | vcl/source/bitmap/BitmapEmbossGreyFilter.cxx | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/vcl/source/bitmap/BitmapEmbossGreyFilter.cxx b/vcl/source/bitmap/BitmapEmbossGreyFilter.cxx new file mode 100644 index 000000000..a8705176f --- /dev/null +++ b/vcl/source/bitmap/BitmapEmbossGreyFilter.cxx @@ -0,0 +1,160 @@ +/* -*- 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: */ |