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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/BitmapMosaicFilter.hxx>
#include <bitmapwriteaccess.hxx>
BitmapEx BitmapMosaicFilter::execute(BitmapEx const& rBitmapEx) const
{
Bitmap aBitmap(rBitmapEx.GetBitmap());
bool bRet = false;
if (mnTileWidth > 1 || mnTileHeight > 1)
{
std::unique_ptr<Bitmap> pNewBmp;
BitmapReadAccess* pReadAcc;
BitmapWriteAccess* pWriteAcc;
if (aBitmap.GetBitCount() > 8)
{
pReadAcc = pWriteAcc = aBitmap.AcquireWriteAccess();
}
else
{
pNewBmp.reset(new Bitmap(aBitmap.GetSizePixel(), 24));
pReadAcc = aBitmap.AcquireReadAccess();
pWriteAcc = pNewBmp->AcquireWriteAccess();
}
bool bConditionsMet = false;
long nWidth(0);
long nHeight(0);
if (pReadAcc && pWriteAcc)
{
nWidth = pReadAcc->Width();
nHeight = pReadAcc->Height();
bConditionsMet = (nWidth > 0 && nHeight > 0);
}
if (bConditionsMet)
{
BitmapColor aCol;
long nX, nY, nX1, nX2, nY1, nY2, nSumR, nSumG, nSumB;
double fArea_1;
nY1 = 0;
nY2 = mnTileHeight - 1;
if (nY2 >= nHeight)
nY2 = nHeight - 1;
do
{
nX1 = 0;
nX2 = mnTileWidth - 1;
if (nX2 >= nWidth)
nX2 = nWidth - 1;
fArea_1 = 1.0 / ((nX2 - nX1 + 1) * (nY2 - nY1 + 1));
if (!pNewBmp)
{
do
{
for (nY = nY1, nSumR = nSumG = nSumB = 0; nY <= nY2; nY++)
{
Scanline pScanlineRead = pReadAcc->GetScanline(nY);
for (nX = nX1; nX <= nX2; nX++)
{
aCol = pReadAcc->GetPixelFromData(pScanlineRead, nX);
nSumR += aCol.GetRed();
nSumG += aCol.GetGreen();
nSumB += aCol.GetBlue();
}
}
aCol.SetRed(static_cast<sal_uInt8>(nSumR * fArea_1));
aCol.SetGreen(static_cast<sal_uInt8>(nSumG * fArea_1));
aCol.SetBlue(static_cast<sal_uInt8>(nSumB * fArea_1));
for (nY = nY1; nY <= nY2; nY++)
{
Scanline pScanline = pWriteAcc->GetScanline(nY);
for (nX = nX1; nX <= nX2; nX++)
pWriteAcc->SetPixelOnData(pScanline, nX, aCol);
}
nX1 += mnTileWidth;
nX2 += mnTileWidth;
if (nX2 >= nWidth)
{
nX2 = nWidth - 1;
fArea_1 = 1.0 / ((nX2 - nX1 + 1) * (nY2 - nY1 + 1));
}
} while (nX1 < nWidth);
}
else
{
do
{
for (nY = nY1, nSumR = nSumG = nSumB = 0; nY <= nY2; nY++)
{
Scanline pScanlineRead = pReadAcc->GetScanline(nY);
for (nX = nX1; nX <= nX2; nX++)
{
const BitmapColor& rCol = pReadAcc->GetPaletteColor(
pReadAcc->GetIndexFromData(pScanlineRead, nX));
nSumR += rCol.GetRed();
nSumG += rCol.GetGreen();
nSumB += rCol.GetBlue();
}
}
aCol.SetRed(static_cast<sal_uInt8>(nSumR * fArea_1));
aCol.SetGreen(static_cast<sal_uInt8>(nSumG * fArea_1));
aCol.SetBlue(static_cast<sal_uInt8>(nSumB * fArea_1));
for (nY = nY1; nY <= nY2; nY++)
{
Scanline pScanline = pWriteAcc->GetScanline(nY);
for (nX = nX1; nX <= nX2; nX++)
pWriteAcc->SetPixelOnData(pScanline, nX, aCol);
}
nX1 += mnTileWidth;
nX2 += mnTileWidth;
if (nX2 >= nWidth)
{
nX2 = nWidth - 1;
fArea_1 = 1.0 / ((nX2 - nX1 + 1) * (nY2 - nY1 + 1));
}
} while (nX1 < nWidth);
}
nY1 += mnTileHeight;
nY2 += mnTileHeight;
if (nY2 >= nHeight)
nY2 = nHeight - 1;
} while (nY1 < nHeight);
bRet = true;
}
Bitmap::ReleaseAccess(pReadAcc);
if (pNewBmp)
{
Bitmap::ReleaseAccess(pWriteAcc);
if (bRet)
{
const MapMode aMap(aBitmap.GetPrefMapMode());
const Size aPrefSize(aBitmap.GetPrefSize());
aBitmap = *pNewBmp;
aBitmap.SetPrefMapMode(aMap);
aBitmap.SetPrefSize(aPrefSize);
}
}
}
if (bRet)
return BitmapEx(aBitmap);
return BitmapEx();
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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