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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 <algorithm>
#include <vcl/bitmap.hxx>
#include <vcl/bitmapex.hxx>
#include <vcl/BitmapColorQuantizationFilter.hxx>
#include <vcl/bitmapaccess.hxx>
#include <bitmapwriteaccess.hxx>
#include <cstdlib>
BitmapEx BitmapColorQuantizationFilter::execute(BitmapEx const& aBitmapEx) const
{
Bitmap aBitmap = aBitmapEx.GetBitmap();
bool bRet = false;
if (aBitmap.GetColorCount() <= sal_Int64(mnNewColorCount))
{
bRet = true;
}
else
{
Bitmap::ScopedReadAccess pRAcc(aBitmap);
sal_uInt16 nBitCount;
auto const cappedNewColorCount = std::min(mnNewColorCount, sal_uInt16(256));
if (cappedNewColorCount < 17)
nBitCount = 4;
else
nBitCount = 8;
if (pRAcc)
{
const sal_uInt32 nValidBits = 4;
const sal_uInt32 nRightShiftBits = 8 - nValidBits;
const sal_uInt32 nLeftShiftBits1 = nValidBits;
const sal_uInt32 nLeftShiftBits2 = nValidBits << 1;
const sal_uInt32 nColorsPerComponent = 1 << nValidBits;
const sal_uInt32 nColorOffset = 256 / nColorsPerComponent;
const sal_uInt32 nTotalColors
= nColorsPerComponent * nColorsPerComponent * nColorsPerComponent;
const tools::Long nWidth = pRAcc->Width();
const tools::Long nHeight = pRAcc->Height();
std::unique_ptr<PopularColorCount[]> pCountTable(new PopularColorCount[nTotalColors]);
memset(pCountTable.get(), 0, nTotalColors * sizeof(PopularColorCount));
for (tools::Long nR = 0, nIndex = 0; nR < 256; nR += nColorOffset)
{
for (tools::Long nG = 0; nG < 256; nG += nColorOffset)
{
for (tools::Long nB = 0; nB < 256; nB += nColorOffset)
{
pCountTable[nIndex].mnIndex = nIndex;
nIndex++;
}
}
}
if (pRAcc->HasPalette())
{
for (tools::Long nY = 0; nY < nHeight; nY++)
{
Scanline pScanlineRead = pRAcc->GetScanline(nY);
for (tools::Long nX = 0; nX < nWidth; nX++)
{
const BitmapColor& rCol
= pRAcc->GetPaletteColor(pRAcc->GetIndexFromData(pScanlineRead, nX));
pCountTable[((static_cast<sal_uInt32>(rCol.GetRed()) >> nRightShiftBits)
<< nLeftShiftBits2)
| ((static_cast<sal_uInt32>(rCol.GetGreen()) >> nRightShiftBits)
<< nLeftShiftBits1)
| (static_cast<sal_uInt32>(rCol.GetBlue()) >> nRightShiftBits)]
.mnCount++;
}
}
}
else
{
for (tools::Long nY = 0; nY < nHeight; nY++)
{
Scanline pScanlineRead = pRAcc->GetScanline(nY);
for (tools::Long nX = 0; nX < nWidth; nX++)
{
const BitmapColor aCol(pRAcc->GetPixelFromData(pScanlineRead, nX));
pCountTable[((static_cast<sal_uInt32>(aCol.GetRed()) >> nRightShiftBits)
<< nLeftShiftBits2)
| ((static_cast<sal_uInt32>(aCol.GetGreen()) >> nRightShiftBits)
<< nLeftShiftBits1)
| (static_cast<sal_uInt32>(aCol.GetBlue()) >> nRightShiftBits)]
.mnCount++;
}
}
}
BitmapPalette aNewPal(cappedNewColorCount);
std::qsort(pCountTable.get(), nTotalColors, sizeof(PopularColorCount),
[](const void* p1, const void* p2) {
int nRet;
if (static_cast<PopularColorCount const*>(p1)->mnCount
< static_cast<PopularColorCount const*>(p2)->mnCount)
nRet = 1;
else if (static_cast<PopularColorCount const*>(p1)->mnCount
== static_cast<PopularColorCount const*>(p2)->mnCount)
nRet = 0;
else
nRet = -1;
return nRet;
});
for (sal_uInt16 n = 0; n < cappedNewColorCount; n++)
{
const PopularColorCount& rPop = pCountTable[n];
aNewPal[n] = BitmapColor(
static_cast<sal_uInt8>((rPop.mnIndex >> nLeftShiftBits2) << nRightShiftBits),
static_cast<sal_uInt8>(
((rPop.mnIndex >> nLeftShiftBits1) & (nColorsPerComponent - 1))
<< nRightShiftBits),
static_cast<sal_uInt8>((rPop.mnIndex & (nColorsPerComponent - 1))
<< nRightShiftBits));
}
Bitmap aNewBmp(aBitmap.GetSizePixel(), nBitCount, &aNewPal);
BitmapScopedWriteAccess pWAcc(aNewBmp);
if (pWAcc)
{
BitmapColor aDstCol(sal_uInt8(0));
std::unique_ptr<sal_uInt8[]> pIndexMap(new sal_uInt8[nTotalColors]);
for (tools::Long nR = 0, nIndex = 0; nR < 256; nR += nColorOffset)
{
for (tools::Long nG = 0; nG < 256; nG += nColorOffset)
{
for (tools::Long nB = 0; nB < 256; nB += nColorOffset)
{
pIndexMap[nIndex++] = static_cast<sal_uInt8>(aNewPal.GetBestIndex(
BitmapColor(static_cast<sal_uInt8>(nR), static_cast<sal_uInt8>(nG),
static_cast<sal_uInt8>(nB))));
}
}
}
if (pRAcc->HasPalette())
{
for (tools::Long nY = 0; nY < nHeight; nY++)
{
Scanline pScanline = pWAcc->GetScanline(nY);
Scanline pScanlineRead = pRAcc->GetScanline(nY);
for (tools::Long nX = 0; nX < nWidth; nX++)
{
const BitmapColor& rCol = pRAcc->GetPaletteColor(
pRAcc->GetIndexFromData(pScanlineRead, nX));
aDstCol.SetIndex(pIndexMap[((static_cast<sal_uInt32>(rCol.GetRed())
>> nRightShiftBits)
<< nLeftShiftBits2)
| ((static_cast<sal_uInt32>(rCol.GetGreen())
>> nRightShiftBits)
<< nLeftShiftBits1)
| (static_cast<sal_uInt32>(rCol.GetBlue())
>> nRightShiftBits)]);
pWAcc->SetPixelOnData(pScanline, nX, aDstCol);
}
}
}
else
{
for (tools::Long nY = 0; nY < nHeight; nY++)
{
Scanline pScanline = pWAcc->GetScanline(nY);
Scanline pScanlineRead = pRAcc->GetScanline(nY);
for (tools::Long nX = 0; nX < nWidth; nX++)
{
const BitmapColor aCol(pRAcc->GetPixelFromData(pScanlineRead, nX));
aDstCol.SetIndex(pIndexMap[((static_cast<sal_uInt32>(aCol.GetRed())
>> nRightShiftBits)
<< nLeftShiftBits2)
| ((static_cast<sal_uInt32>(aCol.GetGreen())
>> nRightShiftBits)
<< nLeftShiftBits1)
| (static_cast<sal_uInt32>(aCol.GetBlue())
>> nRightShiftBits)]);
pWAcc->SetPixelOnData(pScanline, nX, aDstCol);
}
}
}
pWAcc.reset();
bRet = true;
}
pCountTable.reset();
pRAcc.reset();
if (bRet)
{
const MapMode aMap(aBitmap.GetPrefMapMode());
const Size aSize(aBitmap.GetPrefSize());
aBitmap = aNewBmp;
aBitmap.SetPrefMapMode(aMap);
aBitmap.SetPrefSize(aSize);
}
}
}
if (bRet)
return BitmapEx(aBitmap);
return BitmapEx();
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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