vcl/source/bitmap/BitmapEmbossGreyFilter.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  */
  10
  11 #include <sal/config.h>
  12
  13 #include <tools/helpers.hxx>
  14
  15 #include <vcl/bitmap.hxx>
  16 #include <vcl/bitmapex.hxx>
  17 #include <vcl/BitmapEmbossGreyFilter.hxx>
  18
  19 #include <bitmap/BitmapWriteAccess.hxx>
  20
  21 #include <algorithm>
  22
  23 BitmapEx BitmapEmbossGreyFilter::execute(BitmapEx const& rBitmapEx) const
  24 {
  25     Bitmap aBitmap(rBitmapEx.GetBitmap());
  26
  27     if (!aBitmap.ImplMakeGreyscales())
  28         return BitmapEx();
  29
  30     Bitmap::ScopedReadAccess pReadAcc(aBitmap);
  31     if (!pReadAcc)
  32         return BitmapEx();
  33
  34     Bitmap aNewBmp(aBitmap.GetSizePixel(), vcl::PixelFormat::N8_BPP, &pReadAcc->GetPalette());
  35     BitmapScopedWriteAccess pWriteAcc(aNewBmp);
  36     if (!pWriteAcc)
  37         return BitmapEx();
  38
  39     BitmapColor aGrey(sal_uInt8(0));
  40     const sal_Int32 nWidth = pWriteAcc->Width();
  41     const sal_Int32 nHeight = pWriteAcc->Height();
  42     sal_Int32 nGrey11, nGrey12, nGrey13;
  43     sal_Int32 nGrey21, nGrey22, nGrey23;
  44     sal_Int32 nGrey31, nGrey32, nGrey33;
  45     double fAzim = basegfx::deg2rad<100>(mnAzimuthAngle100);
  46     double fElev = basegfx::deg2rad<100>(mnElevationAngle100);
  47     std::unique_ptr<sal_Int32[]> pHMap(new sal_Int32[nWidth + 2]);
  48     std::unique_ptr<sal_Int32[]> pVMap(new sal_Int32[nHeight + 2]);
  49     sal_Int32 nX, nY, nNx, nNy, nDotL;
  50     const sal_Int32 nLx = FRound(cos(fAzim) * cos(fElev) * 255.0);
  51     const sal_Int32 nLy = FRound(sin(fAzim) * cos(fElev) * 255.0);
  52     const sal_Int32 nLz = FRound(sin(fElev) * 255.0);
  53     const auto nZ2 = ((6 * 255) / 4) * ((6 * 255) / 4);
  54     const sal_Int32 nNzLz = ((6 * 255) / 4) * nLz;
  55     const sal_uInt8 cLz = static_cast<sal_uInt8>(std::clamp(nLz, sal_Int32(0), sal_Int32(255)));
  56
  57     // fill mapping tables
  58     pHMap[0] = 0;
  59
  60     for (nX = 1; nX <= nWidth; nX++)
  61     {
  62         pHMap[nX] = nX - 1;
  63     }
  64
  65     pHMap[nWidth + 1] = nWidth - 1;
  66
  67     pVMap[0] = 0;
  68
  69     for (nY = 1; nY <= nHeight; nY++)
  70     {
  71         pVMap[nY] = nY - 1;
  72     }
  73
  74     pVMap[nHeight + 1] = nHeight - 1;
  75
  76     for (nY = 0; nY < nHeight; nY++)
  77     {
  78         nGrey11 = pReadAcc->GetPixel(pVMap[nY], pHMap[0]).GetIndex();
  79         nGrey12 = pReadAcc->GetPixel(pVMap[nY], pHMap[1]).GetIndex();
  80         nGrey13 = pReadAcc->GetPixel(pVMap[nY], pHMap[2]).GetIndex();
  81         nGrey21 = pReadAcc->GetPixel(pVMap[nY + 1], pHMap[0]).GetIndex();
  82         nGrey22 = pReadAcc->GetPixel(pVMap[nY + 1], pHMap[1]).GetIndex();
  83         nGrey23 = pReadAcc->GetPixel(pVMap[nY + 1], pHMap[2]).GetIndex();
  84         nGrey31 = pReadAcc->GetPixel(pVMap[nY + 2], pHMap[0]).GetIndex();
  85         nGrey32 = pReadAcc->GetPixel(pVMap[nY + 2], pHMap[1]).GetIndex();
  86         nGrey33 = pReadAcc->GetPixel(pVMap[nY + 2], pHMap[2]).GetIndex();
  87
  88         Scanline pScanline = pWriteAcc->GetScanline(nY);
  89         for (nX = 0; nX < nWidth; nX++)
  90         {
  91             nNx = nGrey11 + nGrey21 + nGrey31 - nGrey13 - nGrey23 - nGrey33;
  92             nNy = nGrey31 + nGrey32 + nGrey33 - nGrey11 - nGrey12 - nGrey13;
  93
  94             if (!nNx && !nNy)
  95             {
  96                 aGrey.SetIndex(cLz);
  97             }
  98             else if ((nDotL = nNx * nLx + nNy * nLy + nNzLz) < 0)
  99             {
 100                 aGrey.SetIndex(0);
 101             }
 102             else
 103             {
 104                 const double fGrey = nDotL / sqrt(static_cast<double>(nNx * nNx + nNy * nNy + nZ2));
 105                 aGrey.SetIndex(static_cast<sal_uInt8>(std::clamp(fGrey, 0.0, 255.0)));
 106             }
 107
 108             pWriteAcc->SetPixelOnData(pScanline, nX, aGrey);
 109
 110             if (nX < (nWidth - 1))
 111             {
 112                 const sal_Int32 nNextX = pHMap[nX + 3];
 113
 114                 nGrey11 = nGrey12;
 115                 nGrey12 = nGrey13;
 116                 nGrey13 = pReadAcc->GetPixel(pVMap[nY], nNextX).GetIndex();
 117                 nGrey21 = nGrey22;
 118                 nGrey22 = nGrey23;
 119                 nGrey23 = pReadAcc->GetPixel(pVMap[nY + 1], nNextX).GetIndex();
 120                 nGrey31 = nGrey32;
 121                 nGrey32 = nGrey33;
 122                 nGrey33 = pReadAcc->GetPixel(pVMap[nY + 2], nNextX).GetIndex();
 123             }
 124         }
 125     }
 126
 127     pHMap.reset();
 128     pVMap.reset();
 129     pWriteAcc.reset();
 130     pReadAcc.reset();
 131
 132     const MapMode aMap(aBitmap.GetPrefMapMode());
 133     const Size aPrefSize(aBitmap.GetPrefSize());
 134
 135     aBitmap = aNewBmp;
 136
 137     aBitmap.SetPrefMapMode(aMap);
 138     aBitmap.SetPrefSize(aPrefSize);
 139
 140     return BitmapEx(aBitmap);
 141 }
 142
 143 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */