LibreOffice Module vcl (master)  1
BitmapSolarizeFilter.cxx
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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 <vcl/bitmap.hxx>
12 #include <vcl/bitmapex.hxx>
14 
15 #include <bitmapwriteaccess.hxx>
16 
18 {
19  Bitmap aBitmap(rBitmapEx.GetBitmap());
20  bool bRet = false;
21  BitmapScopedWriteAccess pWriteAcc(aBitmap);
22 
23  if (pWriteAcc)
24  {
25  if (pWriteAcc->HasPalette())
26  {
27  const BitmapPalette& rPal = pWriteAcc->GetPalette();
28 
29  for (sal_uInt16 i = 0, nCount = rPal.GetEntryCount(); i < nCount; i++)
30  {
31  if (rPal[i].GetLuminance() >= mcSolarGreyThreshold)
32  {
33  BitmapColor aCol(rPal[i]);
34  aCol.Invert();
35  pWriteAcc->SetPaletteColor(i, aCol);
36  }
37  }
38  }
39  else
40  {
41  BitmapColor aCol;
42  const long nWidth = pWriteAcc->Width();
43  const long nHeight = pWriteAcc->Height();
44 
45  for (long nY = 0; nY < nHeight; nY++)
46  {
47  Scanline pScanline = pWriteAcc->GetScanline(nY);
48  for (long nX = 0; nX < nWidth; nX++)
49  {
50  aCol = pWriteAcc->GetPixelFromData(pScanline, nX);
51 
52  if (aCol.GetLuminance() >= mcSolarGreyThreshold)
53  {
54  aCol.Invert();
55  pWriteAcc->SetPixelOnData(pScanline, nX, aCol);
56  }
57  }
58  }
59  }
60 
61  pWriteAcc.reset();
62  bRet = true;
63  }
64 
65  if (bRet)
66  return rBitmapEx;
67 
68  return BitmapEx();
69 }
70 
71 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
sal_uInt8 const mcSolarGreyThreshold
Scanline GetScanline(long nY) const
sal_uInt8 GetLuminance() const
long Width() const
void SetPixelOnData(sal_uInt8 *pData, long nX, const BitmapColor &rBitmapColor)
Bitmap GetBitmap(const Color *pTransReplaceColor=nullptr) const
Definition: bitmapex.cxx:236
void Invert()
sal_uInt16 GetEntryCount() const
sal_uInt8 * Scanline
Definition: Scanline.hxx:25
bool HasPalette() const
int i
virtual BitmapEx execute(BitmapEx const &rBitmapEx) const override
long Height() const
const BitmapPalette & GetPalette() const
BitmapColor GetPixelFromData(const sal_uInt8 *pData, long nX) const
void SetPaletteColor(sal_uInt16 nColor, const BitmapColor &rBitmapColor)