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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 <vcl/bitmap.hxx>
#include <vcl/bitmapex.hxx>
#include <vcl/bitmapaccess.hxx>
#include <vcl/BitmapPopArtFilter.hxx>
#include <bitmapwriteaccess.hxx>
#include <cstdlib>
BitmapEx BitmapPopArtFilter::execute(BitmapEx const& rBitmapEx)
{
Bitmap aBitmap(rBitmapEx.GetBitmap());
bool bRet = (aBitmap.GetBitCount() <= 8) || aBitmap.Convert(BmpConversion::N8BitColors);
if (bRet)
{
bRet = false;
BitmapScopedWriteAccess pWriteAcc(aBitmap);
if (pWriteAcc)
{
const long nWidth = pWriteAcc->Width();
const long nHeight = pWriteAcc->Height();
const int nEntryCount = 1 << pWriteAcc->GetBitCount();
int n = 0;
PopArtEntry* pPopArtTable = new PopArtEntry[nEntryCount];
for (n = 0; n < nEntryCount; n++)
{
PopArtEntry& rEntry = pPopArtTable[n];
rEntry.mnIndex = static_cast<sal_uInt16>(n);
rEntry.mnCount = 0;
}
// get pixel count for each palette entry
for (long nY = 0; nY < nHeight; nY++)
{
Scanline pScanline = pWriteAcc->GetScanline(nY);
for (long nX = 0; nX < nWidth; nX++)
{
pPopArtTable[pWriteAcc->GetIndexFromData(pScanline, nX)].mnCount++;
}
}
// sort table
std::qsort(pPopArtTable, nEntryCount, sizeof(PopArtEntry),
[](const void* p1, const void* p2) {
int nRet;
if (static_cast<PopArtEntry const*>(p1)->mnCount
< static_cast<PopArtEntry const*>(p2)->mnCount)
{
nRet = 1;
}
else if (static_cast<PopArtEntry const*>(p1)->mnCount
== static_cast<PopArtEntry const*>(p2)->mnCount)
{
nRet = 0;
}
else
{
nRet = -1;
}
return nRet;
});
// get last used entry
sal_uLong nFirstEntry;
sal_uLong nLastEntry = 0;
for (n = 0; n < nEntryCount; n++)
{
if (pPopArtTable[n].mnCount)
nLastEntry = n;
}
// rotate palette (one entry)
const BitmapColor aFirstCol(pWriteAcc->GetPaletteColor(
sal::static_int_cast<sal_uInt16>(pPopArtTable[0].mnIndex)));
for (nFirstEntry = 0; nFirstEntry < nLastEntry; nFirstEntry++)
{
pWriteAcc->SetPaletteColor(
sal::static_int_cast<sal_uInt16>(pPopArtTable[nFirstEntry].mnIndex),
pWriteAcc->GetPaletteColor(
sal::static_int_cast<sal_uInt16>(pPopArtTable[nFirstEntry + 1].mnIndex)));
}
pWriteAcc->SetPaletteColor(
sal::static_int_cast<sal_uInt16>(pPopArtTable[nLastEntry].mnIndex), aFirstCol);
// cleanup
delete[] pPopArtTable;
pWriteAcc.reset();
bRet = true;
}
}
if (bRet)
return BitmapEx(aBitmap);
return BitmapEx();
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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