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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 <tools/helpers.hxx>
#include <osl/diagnose.h>
#include <vcl/bitmapex.hxx>
#include <vcl/bitmapaccess.hxx>
#include <bitmapwriteaccess.hxx>
#include <BitmapFastScaleFilter.hxx>
#include <BitmapInterpolateScaleFilter.hxx>
BitmapEx BitmapInterpolateScaleFilter::execute(BitmapEx const& rBitmapEx) const
{
Bitmap aBitmap(rBitmapEx.GetBitmap());
const Size aSizePix(aBitmap.GetSizePixel());
const long nNewWidth = FRound(aSizePix.Width() * mfScaleX);
const long nNewHeight = FRound(aSizePix.Height() * mfScaleY);
bool bRet = false;
if ((nNewWidth > 1) && (nNewHeight > 1))
{
Bitmap::ScopedReadAccess pReadAcc(aBitmap);
if (pReadAcc)
{
long nWidth = pReadAcc->Width();
long nHeight = pReadAcc->Height();
Bitmap aNewBmp(Size(nNewWidth, nHeight), 24);
BitmapScopedWriteAccess pWriteAcc(aNewBmp);
if (pWriteAcc)
{
const long nNewWidth1 = nNewWidth - 1;
const long nWidth1 = pReadAcc->Width() - 1;
const double fRevScaleX = static_cast<double>(nWidth1) / nNewWidth1;
std::unique_ptr<long[]> pLutInt(new long[nNewWidth]);
std::unique_ptr<long[]> pLutFrac(new long[nNewWidth]);
for (long nX = 0, nTemp = nWidth - 2; nX < nNewWidth; nX++)
{
double fTemp = nX * fRevScaleX;
pLutInt[nX] = MinMax(static_cast<long>(fTemp), 0, nTemp);
fTemp -= pLutInt[nX];
pLutFrac[nX] = static_cast<long>(fTemp * 1024.);
}
for (long nY = 0; nY < nHeight; nY++)
{
Scanline pScanlineRead = pReadAcc->GetScanline(nY);
if (1 == nWidth)
{
BitmapColor aCol0;
if (pReadAcc->HasPalette())
{
aCol0 = pReadAcc->GetPaletteColor(
pReadAcc->GetIndexFromData(pScanlineRead, 0));
}
else
{
aCol0 = pReadAcc->GetPixelFromData(pScanlineRead, 0);
}
Scanline pScanline = pWriteAcc->GetScanline(nY);
for (long nX = 0; nX < nNewWidth; nX++)
{
pWriteAcc->SetPixelOnData(pScanline, nX, aCol0);
}
}
else
{
Scanline pScanline = pWriteAcc->GetScanline(nY);
for (long nX = 0; nX < nNewWidth; nX++)
{
long nTemp = pLutInt[nX];
BitmapColor aCol0, aCol1;
if (pReadAcc->HasPalette())
{
aCol0 = pReadAcc->GetPaletteColor(
pReadAcc->GetIndexFromData(pScanlineRead, nTemp++));
aCol1 = pReadAcc->GetPaletteColor(
pReadAcc->GetIndexFromData(pScanlineRead, nTemp));
}
else
{
aCol0 = pReadAcc->GetPixelFromData(pScanlineRead, nTemp++);
aCol1 = pReadAcc->GetPixelFromData(pScanlineRead, nTemp);
}
nTemp = pLutFrac[nX];
long lXR0 = aCol0.GetRed();
long lXG0 = aCol0.GetGreen();
long lXB0 = aCol0.GetBlue();
long lXR1 = aCol1.GetRed() - lXR0;
long lXG1 = aCol1.GetGreen() - lXG0;
long lXB1 = aCol1.GetBlue() - lXB0;
aCol0.SetRed(
static_cast<sal_uInt8>((lXR1 * nTemp + (lXR0 << 10)) >> 10));
aCol0.SetGreen(
static_cast<sal_uInt8>((lXG1 * nTemp + (lXG0 << 10)) >> 10));
aCol0.SetBlue(
static_cast<sal_uInt8>((lXB1 * nTemp + (lXB0 << 10)) >> 10));
pWriteAcc->SetPixelOnData(pScanline, nX, aCol0);
}
}
}
bRet = true;
}
pReadAcc.reset();
pWriteAcc.reset();
if (bRet)
{
bRet = false;
const Bitmap aOriginal(aBitmap);
aBitmap = aNewBmp;
aNewBmp = Bitmap(Size(nNewWidth, nNewHeight), 24);
pReadAcc = Bitmap::ScopedReadAccess(aBitmap);
pWriteAcc = BitmapScopedWriteAccess(aNewBmp);
if (pReadAcc && pWriteAcc)
{
const long nNewHeight1 = nNewHeight - 1;
const long nHeight1 = pReadAcc->Height() - 1;
const double fRevScaleY = static_cast<double>(nHeight1) / nNewHeight1;
std::unique_ptr<long[]> pLutInt(new long[nNewHeight]);
std::unique_ptr<long[]> pLutFrac(new long[nNewHeight]);
for (long nY = 0, nTemp = nHeight - 2; nY < nNewHeight; nY++)
{
double fTemp = nY * fRevScaleY;
pLutInt[nY] = MinMax(static_cast<long>(fTemp), 0, nTemp);
fTemp -= pLutInt[nY];
pLutFrac[nY] = static_cast<long>(fTemp * 1024.);
}
// after 1st step, bitmap *is* 24bit format (see above)
OSL_ENSURE(!pReadAcc->HasPalette(), "OOps, somehow ImplScaleInterpolate "
"in-between format has palette, should not "
"happen (!)");
for (long nX = 0; nX < nNewWidth; nX++)
{
if (1 == nHeight)
{
BitmapColor aCol0 = pReadAcc->GetPixel(0, nX);
for (long nY = 0; nY < nNewHeight; nY++)
{
pWriteAcc->SetPixel(nY, nX, aCol0);
}
}
else
{
for (long nY = 0; nY < nNewHeight; nY++)
{
long nTemp = pLutInt[nY];
BitmapColor aCol0 = pReadAcc->GetPixel(nTemp++, nX);
BitmapColor aCol1 = pReadAcc->GetPixel(nTemp, nX);
nTemp = pLutFrac[nY];
long lXR0 = aCol0.GetRed();
long lXG0 = aCol0.GetGreen();
long lXB0 = aCol0.GetBlue();
long lXR1 = aCol1.GetRed() - lXR0;
long lXG1 = aCol1.GetGreen() - lXG0;
long lXB1 = aCol1.GetBlue() - lXB0;
aCol0.SetRed(
static_cast<sal_uInt8>((lXR1 * nTemp + (lXR0 << 10)) >> 10));
aCol0.SetGreen(
static_cast<sal_uInt8>((lXG1 * nTemp + (lXG0 << 10)) >> 10));
aCol0.SetBlue(
static_cast<sal_uInt8>((lXB1 * nTemp + (lXB0 << 10)) >> 10));
pWriteAcc->SetPixel(nY, nX, aCol0);
}
}
}
bRet = true;
}
pReadAcc.reset();
pWriteAcc.reset();
if (bRet)
{
aOriginal.AdaptBitCount(aNewBmp);
aBitmap = aNewBmp;
}
}
}
}
if (!bRet)
{
// fallback to fast scale filter
BitmapEx aBmpEx(aBitmap);
bRet = BitmapFilter::Filter(aBmpEx, BitmapFastScaleFilter(mfScaleX, mfScaleY));
aBitmap = aBmpEx.GetBitmap();
}
if (bRet)
return BitmapEx(aBitmap);
return BitmapEx();
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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