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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 <tools/solar.h>
#include <vcl/bitmap.hxx>
#include <vcl/bitmapex.hxx>
#include <vcl/BitmapPopArtFilter.hxx>
#include <bitmap/BitmapWriteAccess.hxx>
BitmapEx BitmapPopArtFilter::execute(BitmapEx const& rBitmapEx) const
{
Bitmap aBitmap(rBitmapEx.GetBitmap());
bool bRet = isPalettePixelFormat(aBitmap.getPixelFormat())
|| aBitmap.Convert(BmpConversion::N8BitColors);
if (bRet)
{
bRet = false;
BitmapScopedWriteAccess pWriteAcc(aBitmap);
if (pWriteAcc)
{
const sal_Int32 nWidth = pWriteAcc->Width();
const sal_Int32 nHeight = pWriteAcc->Height();
const int nEntryCount = 1 << pWriteAcc->GetBitCount();
int n = 0;
std::vector<PopArtEntry> aPopArtTable(nEntryCount);
for (n = 0; n < nEntryCount; n++)
{
PopArtEntry& rEntry = aPopArtTable[n];
rEntry.mnIndex = static_cast<sal_uInt16>(n);
rEntry.mnCount = 0;
}
// get pixel count for each palette entry
for (sal_Int32 nY = 0; nY < nHeight; nY++)
{
Scanline pScanline = pWriteAcc->GetScanline(nY);
for (sal_Int32 nX = 0; nX < nWidth; nX++)
{
aPopArtTable[pWriteAcc->GetIndexFromData(pScanline, nX)].mnCount++;
}
}
// sort table
std::sort(aPopArtTable.begin(), aPopArtTable.end(),
[](const PopArtEntry& lhs, const PopArtEntry& rhs) {
return lhs.mnCount < rhs.mnCount;
});
// get last used entry
sal_uLong nFirstEntry;
sal_uLong nLastEntry = 0;
for (n = 0; n < nEntryCount; n++)
{
if (aPopArtTable[n].mnCount)
nLastEntry = n;
}
// rotate palette (one entry)
const BitmapColor aFirstCol(pWriteAcc->GetPaletteColor(
sal::static_int_cast<sal_uInt16>(aPopArtTable[0].mnIndex)));
for (nFirstEntry = 0; nFirstEntry < nLastEntry; nFirstEntry++)
{
pWriteAcc->SetPaletteColor(
sal::static_int_cast<sal_uInt16>(aPopArtTable[nFirstEntry].mnIndex),
pWriteAcc->GetPaletteColor(
sal::static_int_cast<sal_uInt16>(aPopArtTable[nFirstEntry + 1].mnIndex)));
}
pWriteAcc->SetPaletteColor(
sal::static_int_cast<sal_uInt16>(aPopArtTable[nLastEntry].mnIndex), aFirstCol);
// cleanup
pWriteAcc.reset();
bRet = true;
}
}
if (bRet)
return BitmapEx(aBitmap);
return BitmapEx();
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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