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 <algorithm>
  14
  15 #include <tools/helpers.hxx>
  16 #include <vcl/bitmap.hxx>
  17 #include <vcl/bitmapex.hxx>
  18 #include <vcl/bitmapaccess.hxx>
  19 #include <vcl/BitmapEmbossGreyFilter.hxx>
  20
  21 #include <bitmapwriteaccess.hxx>
  22
  23 BitmapEx BitmapEmbossGreyFilter::execute(BitmapEx const& rBitmapEx) const
  24 {
  25     Bitmap aBitmap(rBitmapEx.GetBitmap());
  26
  27     bool bRet = aBitmap.ImplMakeGreyscales(256);
  28
  29     if (bRet)
  30     {
  31         bRet = false;
  32
  33         Bitmap::ScopedReadAccess pReadAcc(aBitmap);
  34
  35         if (pReadAcc)
  36         {
  37             Bitmap aNewBmp(aBitmap.GetSizePixel(), 8, &pReadAcc->GetPalette());
  38             BitmapScopedWriteAccess pWriteAcc(aNewBmp);
  39
  40             if (pWriteAcc)
  41             {
  42                 BitmapColor aGrey(sal_uInt8(0));
  43                 const long nWidth = pWriteAcc->Width();
  44                 const long nHeight = pWriteAcc->Height();
  45                 long nGrey11, nGrey12, nGrey13;
  46                 long nGrey21, nGrey22, nGrey23;
  47                 long nGrey31, nGrey32, nGrey33;
  48                 double fAzim = basegfx::deg2rad(mnAzimuthAngle100 * 0.01);
  49                 double fElev = basegfx::deg2rad(mnElevationAngle100 * 0.01);
  50                 std::unique_ptr<long[]> pHMap(new long[nWidth + 2]);
  51                 std::unique_ptr<long[]> pVMap(new long[nHeight + 2]);
  52                 long nX, nY, nNx, nNy, nDotL;
  53                 const long nLx = FRound(cos(fAzim) * cos(fElev) * 255.0);
  54                 const long nLy = FRound(sin(fAzim) * cos(fElev) * 255.0);
  55                 const long nLz = FRound(sin(fElev) * 255.0);
  56                 const auto nZ2 = ((6 * 255) / 4) * ((6 * 255) / 4);
  57                 const long nNzLz = ((6 * 255) / 4) * nLz;
  58                 const sal_uInt8 cLz = static_cast<sal_uInt8>(std::clamp(nLz, 0L, 255L));
  59
  60                 // fill mapping tables
  61                 pHMap[0] = 0;
  62
  63                 for (nX = 1; nX <= nWidth; nX++)
  64                 {
  65                     pHMap[nX] = nX - 1;
  66                 }
  67
  68                 pHMap[nWidth + 1] = nWidth - 1;
  69
  70                 pVMap[0] = 0;
  71
  72                 for (nY = 1; nY <= nHeight; nY++)
  73                 {
  74                     pVMap[nY] = nY - 1;
  75                 }
  76
  77                 pVMap[nHeight + 1] = nHeight - 1;
  78
  79                 for (nY = 0; nY < nHeight; nY++)
  80                 {
  81                     nGrey11 = pReadAcc->GetPixel(pVMap[nY], pHMap[0]).GetIndex();
  82                     nGrey12 = pReadAcc->GetPixel(pVMap[nY], pHMap[1]).GetIndex();
  83                     nGrey13 = pReadAcc->GetPixel(pVMap[nY], pHMap[2]).GetIndex();
  84                     nGrey21 = pReadAcc->GetPixel(pVMap[nY + 1], pHMap[0]).GetIndex();
  85                     nGrey22 = pReadAcc->GetPixel(pVMap[nY + 1], pHMap[1]).GetIndex();
  86                     nGrey23 = pReadAcc->GetPixel(pVMap[nY + 1], pHMap[2]).GetIndex();
  87                     nGrey31 = pReadAcc->GetPixel(pVMap[nY + 2], pHMap[0]).GetIndex();
  88                     nGrey32 = pReadAcc->GetPixel(pVMap[nY + 2], pHMap[1]).GetIndex();
  89                     nGrey33 = pReadAcc->GetPixel(pVMap[nY + 2], pHMap[2]).GetIndex();
  90
  91                     Scanline pScanline = pWriteAcc->GetScanline(nY);
  92                     for (nX = 0; nX < nWidth; nX++)
  93                     {
  94                         nNx = nGrey11 + nGrey21 + nGrey31 - nGrey13 - nGrey23 - nGrey33;
  95                         nNy = nGrey31 + nGrey32 + nGrey33 - nGrey11 - nGrey12 - nGrey13;
  96
  97                         if (!nNx && !nNy)
  98                         {
  99                             aGrey.SetIndex(cLz);
 100                         }
 101                         else if ((nDotL = nNx * nLx + nNy * nLy + nNzLz) < 0)
 102                         {
 103                             aGrey.SetIndex(0);
 104                         }
 105                         else
 106                         {
 107                             const double fGrey
 108                                 = nDotL / sqrt(static_cast<double>(nNx * nNx + nNy * nNy + nZ2));
 109                             aGrey.SetIndex(static_cast<sal_uInt8>(std::clamp(fGrey, 0.0, 255.0)));
 110                         }
 111
 112                         pWriteAcc->SetPixelOnData(pScanline, nX, aGrey);
 113
 114                         if (nX < (nWidth - 1))
 115                         {
 116                             const long nNextX = pHMap[nX + 3];
 117
 118                             nGrey11 = nGrey12;
 119                             nGrey12 = nGrey13;
 120                             nGrey13 = pReadAcc->GetPixel(pVMap[nY], nNextX).GetIndex();
 121                             nGrey21 = nGrey22;
 122                             nGrey22 = nGrey23;
 123                             nGrey23 = pReadAcc->GetPixel(pVMap[nY + 1], nNextX).GetIndex();
 124                             nGrey31 = nGrey32;
 125                             nGrey32 = nGrey33;
 126                             nGrey33 = pReadAcc->GetPixel(pVMap[nY + 2], nNextX).GetIndex();
 127                         }
 128                     }
 129                 }
 130
 131                 pHMap.reset();
 132                 pVMap.reset();
 133                 pWriteAcc.reset();
 134                 bRet = true;
 135             }
 136
 137             pReadAcc.reset();
 138
 139             if (bRet)
 140             {
 141                 const MapMode aMap(aBitmap.GetPrefMapMode());
 142                 const Size aPrefSize(aBitmap.GetPrefSize());
 143
 144                 aBitmap = aNewBmp;
 145
 146                 aBitmap.SetPrefMapMode(aMap);
 147                 aBitmap.SetPrefSize(aPrefSize);
 148             }
 149         }
 150     }
 151
 152     if (bRet)
 153         return BitmapEx(aBitmap);
 154
 155     return BitmapEx();
 156 }
 157
 158 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */