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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/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <sal/log.hxx>
#include <tools/helpers.hxx>
#include <vcl/bitmapex.hxx>
#include <bitmap/BitmapWriteAccess.hxx>
#include <bitmap/BitmapFastScaleFilter.hxx>
BitmapEx BitmapFastScaleFilter::execute(BitmapEx const& rBitmapEx) const
{
SAL_INFO("vcl.gdi", "BitmapFastScaleFilter::execute()");
Bitmap aBitmap(rBitmapEx.GetBitmap());
const Size aSizePix(aBitmap.GetSizePixel());
const sal_Int32 nNewWidth = FRound(aSizePix.Width() * mfScaleX);
const sal_Int32 nNewHeight = FRound(aSizePix.Height() * mfScaleY);
bool bRet = false;
SAL_INFO("vcl.gdi", "New width: " << nNewWidth << "\nNew height: " << nNewHeight);
if (nNewWidth > 0 && nNewHeight > 0)
{
Bitmap::ScopedReadAccess pReadAcc(aBitmap);
if (pReadAcc)
{
Bitmap aNewBmp(Size(nNewWidth, nNewHeight), aBitmap.getPixelFormat(),
&pReadAcc->GetPalette());
BitmapScopedWriteAccess pWriteAcc(aNewBmp);
if (pWriteAcc)
{
const sal_Int32 nScanlineSize = pWriteAcc->GetScanlineSize();
const sal_Int32 nNewHeight1 = nNewHeight - 1;
if (nNewWidth && nNewHeight)
{
const double nWidth = pReadAcc->Width();
const double nHeight = pReadAcc->Height();
std::unique_ptr<sal_Int32[]> pLutX(new sal_Int32[nNewWidth]);
std::unique_ptr<sal_Int32[]> pLutY(new sal_Int32[nNewHeight]);
for (sal_Int32 nX = 0; nX < nNewWidth; nX++)
{
pLutX[nX] = sal_Int32(nX * nWidth / nNewWidth);
}
for (sal_Int32 nY = 0; nY < nNewHeight; nY++)
{
pLutY[nY] = sal_Int32(nY * nHeight / nNewHeight);
}
sal_Int32 nActY = 0;
while (nActY < nNewHeight)
{
sal_Int32 nMapY = pLutY[nActY];
Scanline pScanline = pWriteAcc->GetScanline(nActY);
Scanline pScanlineRead = pReadAcc->GetScanline(nMapY);
for (sal_Int32 nX = 0; nX < nNewWidth; nX++)
{
pWriteAcc->SetPixelOnData(
pScanline, nX,
pReadAcc->GetPixelFromData(pScanlineRead, pLutX[nX]));
}
while ((nActY < nNewHeight1) && (pLutY[nActY + 1] == nMapY))
{
memcpy(pWriteAcc->GetScanline(nActY + 1), pWriteAcc->GetScanline(nActY),
nScanlineSize);
nActY++;
}
nActY++;
}
bRet = true;
}
pWriteAcc.reset();
}
pReadAcc.reset();
if (bRet)
{
aBitmap.ReassignWithSize(aNewBmp);
SAL_INFO("vcl.gdi", "Bitmap size: " << aBitmap.GetSizePixel());
}
else
{
SAL_WARN("vcl.gdi", "no resize");
}
}
}
AlphaMask aMask(rBitmapEx.GetAlpha());
if (bRet && !aMask.IsEmpty())
bRet = aMask.Scale(maSize, BmpScaleFlag::Fast);
SAL_WARN_IF(!aMask.IsEmpty() && aBitmap.GetSizePixel() != aMask.GetSizePixel(), "vcl",
"BitmapEx::Scale(): size mismatch for bitmap and alpha mask.");
if (bRet)
return BitmapEx(aBitmap, aMask);
return BitmapEx();
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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