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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/BitmapSimpleColorQuantizationFilter.hxx>
#include <bitmapwriteaccess.hxx>
#include <bitmap/Octree.hxx>
BitmapEx BitmapSimpleColorQuantizationFilter::execute(BitmapEx const& aBitmapEx) const
{
Bitmap aBitmap = aBitmapEx.GetBitmap();
bool bRet = false;
if (aBitmap.GetColorCount() <= sal_Int64(mnNewColorCount))
{
bRet = true;
}
else
{
Bitmap aNewBmp;
Bitmap::ScopedReadAccess pRAcc(aBitmap);
const sal_uInt16 nColorCount = std::min(mnNewColorCount, sal_uInt16(256));
sal_uInt16 nBitCount = 0;
if (nColorCount <= 2)
nBitCount = 1;
else if (nColorCount <= 16)
nBitCount = 4;
else
nBitCount = 8;
if (pRAcc)
{
Octree aOct(*pRAcc, nColorCount);
const BitmapPalette& rPal = aOct.GetPalette();
aNewBmp = Bitmap(aBitmap.GetSizePixel(), nBitCount, &rPal);
BitmapScopedWriteAccess pWAcc(aNewBmp);
if (pWAcc)
{
const tools::Long nWidth = pRAcc->Width();
const tools::Long nHeight = pRAcc->Height();
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++)
{
auto c = pRAcc->GetPaletteColor(
pRAcc->GetIndexFromData(pScanlineRead, nX));
pWAcc->SetPixelOnData(
pScanline, nX,
BitmapColor(static_cast<sal_uInt8>(aOct.GetBestPaletteIndex(c))));
}
}
}
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++)
{
auto c = pRAcc->GetPixelFromData(pScanlineRead, nX);
pWAcc->SetPixelOnData(
pScanline, nX,
BitmapColor(static_cast<sal_uInt8>(aOct.GetBestPaletteIndex(c))));
}
}
}
pWAcc.reset();
bRet = true;
}
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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