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1202 | /* -*- 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 <comphelper/threadpool.hxx>
#include <tools/helpers.hxx>
#include <vcl/bitmapaccess.hxx>
#include <bitmapwriteaccess.hxx>
#include <BitmapScaleSuperFilter.hxx>
#include <algorithm>
#include <memory>
#include <svdata.hxx>
#include <sal/log.hxx>
namespace {
#define MAP_PRECISION 7
typedef sal_Int32 BilinearWeightType;
constexpr BilinearWeightType lclMaxWeight()
{
return BilinearWeightType(1) << MAP_PRECISION;
}
constexpr sal_uInt8 MAP(sal_uInt8 cVal0, sal_uInt8 cVal1, BilinearWeightType nFrac)
{
return sal_uInt8(((BilinearWeightType(cVal0) << MAP_PRECISION) + nFrac * (BilinearWeightType(cVal1) - BilinearWeightType(cVal0))) >> MAP_PRECISION);
}
struct ScaleContext
{
BitmapReadAccess* mpSrc;
BitmapWriteAccess* mpDest;
long mnDestW;
bool mbHMirr;
bool mbVMirr;
std::vector<long> maMapIX;
std::vector<long> maMapIY;
std::vector<BilinearWeightType> maMapFX;
std::vector<BilinearWeightType> maMapFY;
ScaleContext( BitmapReadAccess *pSrc,
BitmapWriteAccess *pDest,
long nSrcW, long nDestW,
long nSrcH, long nDestH,
bool bHMirr, bool bVMirr)
: mpSrc(pSrc)
, mpDest(pDest)
, mnDestW(nDestW)
, mbHMirr(bHMirr)
, mbVMirr(bVMirr)
, maMapIX(nDestW)
, maMapIY(nDestH)
, maMapFX(nDestW)
, maMapFY(nDestH)
{
generateMap(nSrcW, nDestW, bHMirr, maMapIX, maMapFX);
generateMap(nSrcH, nDestH, bVMirr, maMapIY, maMapFY);
}
static void generateMap(long nSourceLength, long nDestinationLength, bool bMirrored,
std::vector<long> & rMapIX, std::vector<BilinearWeightType> & rMapFX)
{
const double fRevScale = (nDestinationLength > 1) ? double(nSourceLength - 1) / (nDestinationLength - 1) : 0.0;
long nTemp = nSourceLength - 2;
long nTempX = nSourceLength - 1;
for (long i = 0; i < nDestinationLength; i++)
{
double fTemp = i * fRevScale;
if (bMirrored)
fTemp = nTempX - fTemp;
rMapIX[i] = MinMax(long(fTemp), 0, nTemp);
rMapFX[i] = BilinearWeightType((fTemp - rMapIX[i]) * (BilinearWeightType(1) << MAP_PRECISION));
}
}
};
constexpr long constScaleThreadStrip = 32;
typedef void (*ScaleRangeFn)(ScaleContext &rContext, long nStartY, long nEndY);
class ScaleTask : public comphelper::ThreadTask
{
ScaleRangeFn mpScaleRangeFunction;
ScaleContext& mrContext;
long mnStartY;
long mnEndY;
public:
explicit ScaleTask(const std::shared_ptr<comphelper::ThreadTaskTag>& pTag,
ScaleRangeFn pScaleRangeFunction,
ScaleContext& rContext,
long nStartY, long nEndY)
: comphelper::ThreadTask(pTag)
, mpScaleRangeFunction(pScaleRangeFunction)
, mrContext(rContext)
, mnStartY(nStartY)
, mnEndY(nEndY)
{}
virtual void doWork() override
{
mpScaleRangeFunction(mrContext, mnStartY, mnEndY);
}
};
void scaleUp32bit(ScaleContext &rCtx, long nStartY, long nEndY)
{
const int nColorComponents = 4;
const long nStartX = 0;
const long nEndX = rCtx.mnDestW - 1;
for (long nY = nStartY; nY <= nEndY; nY++)
{
long nTempY = rCtx.maMapIY[nY];
BilinearWeightType nTempFY = rCtx.maMapFY[nY];
Scanline pLine0 = rCtx.mpSrc->GetScanline(nTempY+0);
Scanline pLine1 = rCtx.mpSrc->GetScanline(nTempY+1);
Scanline pScanDest = rCtx.mpDest->GetScanline(nY);
sal_uInt8 nComponent1[nColorComponents];
sal_uInt8 nComponent2[nColorComponents];
Scanline pColorPtr0;
Scanline pColorPtr1;
for (long nX = nStartX; nX <= nEndX; nX++)
{
long nTempX = rCtx.maMapIX[nX];
BilinearWeightType nTempFX = rCtx.maMapFX[nX];
pColorPtr0 = pLine0 + nTempX * nColorComponents;
pColorPtr1 = pColorPtr0 + nColorComponents;
nComponent1[0] = MAP(*pColorPtr0, *pColorPtr1, nTempFX);
pColorPtr0++; pColorPtr1++;
nComponent1[1] = MAP(*pColorPtr0, *pColorPtr1, nTempFX);
pColorPtr0++; pColorPtr1++;
nComponent1[2] = MAP(*pColorPtr0, *pColorPtr1, nTempFX);
pColorPtr0++; pColorPtr1++;
nComponent1[3] = MAP(*pColorPtr0, *pColorPtr1, nTempFX);
pColorPtr0 = pLine1 + nTempX * nColorComponents;
pColorPtr1 = pColorPtr0 + nColorComponents;
nComponent2[0] = MAP(*pColorPtr0, *pColorPtr1, nTempFX);
pColorPtr0++; pColorPtr1++;
nComponent2[1] = MAP(*pColorPtr0, *pColorPtr1, nTempFX);
pColorPtr0++; pColorPtr1++;
nComponent2[2] = MAP(*pColorPtr0, *pColorPtr1, nTempFX);
pColorPtr0++; pColorPtr1++;
nComponent2[3] = MAP(*pColorPtr0, *pColorPtr1, nTempFX);
*pScanDest = MAP(nComponent1[0], nComponent2[0], nTempFY);
pScanDest++;
*pScanDest = MAP(nComponent1[1], nComponent2[1], nTempFY);
pScanDest++;
*pScanDest = MAP(nComponent1[2], nComponent2[2], nTempFY);
pScanDest++;
*pScanDest = MAP(nComponent1[3], nComponent2[3], nTempFY);
pScanDest++;
}
}
}
void scaleUpPalette8bit(ScaleContext &rCtx, long nStartY, long nEndY)
{
const long nStartX = 0, nEndX = rCtx.mnDestW - 1;
for( long nY = nStartY; nY <= nEndY; nY++ )
{
long nTempY = rCtx.maMapIY[ nY ];
BilinearWeightType nTempFY = rCtx.maMapFY[ nY ];
Scanline pLine0 = rCtx.mpSrc->GetScanline( nTempY );
Scanline pLine1 = rCtx.mpSrc->GetScanline( ++nTempY );
Scanline pScanDest = rCtx.mpDest->GetScanline( nY );
for(long nX = nStartX, nXDst = 0; nX <= nEndX; nX++ )
{
long nTempX = rCtx.maMapIX[ nX ];
BilinearWeightType nTempFX = rCtx.maMapFX[ nX ];
const BitmapColor& rCol0 = rCtx.mpSrc->GetPaletteColor( pLine0[ nTempX ] );
const BitmapColor& rCol2 = rCtx.mpSrc->GetPaletteColor( pLine1[ nTempX ] );
const BitmapColor& rCol1 = rCtx.mpSrc->GetPaletteColor( pLine0[ ++nTempX ] );
const BitmapColor& rCol3 = rCtx.mpSrc->GetPaletteColor( pLine1[ nTempX ] );
sal_uInt8 cR0 = MAP( rCol0.GetRed(), rCol1.GetRed(), nTempFX );
sal_uInt8 cG0 = MAP( rCol0.GetGreen(), rCol1.GetGreen(), nTempFX );
sal_uInt8 cB0 = MAP( rCol0.GetBlue(), rCol1.GetBlue(), nTempFX );
sal_uInt8 cR1 = MAP( rCol2.GetRed(), rCol3.GetRed(), nTempFX );
sal_uInt8 cG1 = MAP( rCol2.GetGreen(), rCol3.GetGreen(), nTempFX );
sal_uInt8 cB1 = MAP( rCol2.GetBlue(), rCol3.GetBlue(), nTempFX );
BitmapColor aColRes( MAP( cR0, cR1, nTempFY ),
MAP( cG0, cG1, nTempFY ),
MAP( cB0, cB1, nTempFY ) );
rCtx.mpDest->SetPixelOnData( pScanDest, nXDst++, aColRes );
}
}
}
void scaleUpPaletteGeneral(ScaleContext &rCtx, long nStartY, long nEndY)
{
const long nStartX = 0, nEndX = rCtx.mnDestW - 1;
for( long nY = nStartY; nY <= nEndY; nY++ )
{
long nTempY = rCtx.maMapIY[ nY ];
BilinearWeightType nTempFY = rCtx.maMapFY[ nY ];
Scanline pScanline = rCtx.mpDest->GetScanline( nY );
for( long nX = nStartX, nXDst = 0; nX <= nEndX; nX++ )
{
long nTempX = rCtx.maMapIX[ nX ];
BilinearWeightType nTempFX = rCtx.maMapFX[ nX ];
BitmapColor aCol0 = rCtx.mpSrc->GetPaletteColor( rCtx.mpSrc->GetPixelIndex( nTempY, nTempX ) );
BitmapColor aCol1 = rCtx.mpSrc->GetPaletteColor( rCtx.mpSrc->GetPixelIndex( nTempY, ++nTempX ) );
sal_uInt8 cR0 = MAP( aCol0.GetRed(), aCol1.GetRed(), nTempFX );
sal_uInt8 cG0 = MAP( aCol0.GetGreen(), aCol1.GetGreen(), nTempFX );
sal_uInt8 cB0 = MAP( aCol0.GetBlue(), aCol1.GetBlue(), nTempFX );
aCol1 = rCtx.mpSrc->GetPaletteColor( rCtx.mpSrc->GetPixelIndex( ++nTempY, nTempX ) );
aCol0 = rCtx.mpSrc->GetPaletteColor( rCtx.mpSrc->GetPixelIndex( nTempY--, --nTempX ) );
sal_uInt8 cR1 = MAP( aCol0.GetRed(), aCol1.GetRed(), nTempFX );
sal_uInt8 cG1 = MAP( aCol0.GetGreen(), aCol1.GetGreen(), nTempFX );
sal_uInt8 cB1 = MAP( aCol0.GetBlue(), aCol1.GetBlue(), nTempFX );
BitmapColor aColRes( MAP( cR0, cR1, nTempFY ),
MAP( cG0, cG1, nTempFY ),
MAP( cB0, cB1, nTempFY ) );
rCtx.mpDest->SetPixelOnData( pScanline, nXDst++, aColRes );
}
}
}
void scaleUp24bit(ScaleContext &rCtx, long nStartY, long nEndY)
{
const int nColorComponents = 3;
const long nStartX = 0;
const long nEndX = rCtx.mnDestW - 1;
for (long nY = nStartY; nY <= nEndY; nY++)
{
long nTempY = rCtx.maMapIY[nY];
BilinearWeightType nTempFY = rCtx.maMapFY[nY];
Scanline pLine0 = rCtx.mpSrc->GetScanline(nTempY+0);
Scanline pLine1 = rCtx.mpSrc->GetScanline(nTempY+1);
Scanline pScanDest = rCtx.mpDest->GetScanline(nY);
sal_uInt8 nComponent1[nColorComponents];
sal_uInt8 nComponent2[nColorComponents];
Scanline pColorPtr0;
Scanline pColorPtr1;
for (long nX = nStartX; nX <= nEndX; nX++)
{
long nTempX = rCtx.maMapIX[nX];
BilinearWeightType nTempFX = rCtx.maMapFX[nX];
pColorPtr0 = pLine0 + nTempX * nColorComponents;
pColorPtr1 = pColorPtr0 + nColorComponents;
nComponent1[0] = MAP(*pColorPtr0, *pColorPtr1, nTempFX);
pColorPtr0++; pColorPtr1++;
nComponent1[1] = MAP(*pColorPtr0, *pColorPtr1, nTempFX);
pColorPtr0++; pColorPtr1++;
nComponent1[2] = MAP(*pColorPtr0, *pColorPtr1, nTempFX);
pColorPtr0 = pLine1 + nTempX * nColorComponents;
pColorPtr1 = pColorPtr0 + nColorComponents;
nComponent2[0] = MAP(*pColorPtr0, *pColorPtr1, nTempFX);
pColorPtr0++; pColorPtr1++;
nComponent2[1] = MAP(*pColorPtr0, *pColorPtr1, nTempFX);
pColorPtr0++; pColorPtr1++;
nComponent2[2] = MAP(*pColorPtr0, *pColorPtr1, nTempFX);
*pScanDest = MAP(nComponent1[0], nComponent2[0], nTempFY);
pScanDest++;
*pScanDest = MAP(nComponent1[1], nComponent2[1], nTempFY);
pScanDest++;
*pScanDest = MAP(nComponent1[2], nComponent2[2], nTempFY);
pScanDest++;
}
}
}
void scaleUpNonPaletteGeneral(ScaleContext &rCtx, long nStartY, long nEndY)
{
const long nStartX = 0, nEndX = rCtx.mnDestW - 1;
for( long nY = nStartY; nY <= nEndY; nY++ )
{
long nTempY = rCtx.maMapIY[ nY ];
BilinearWeightType nTempFY = rCtx.maMapFY[ nY ];
Scanline pScanDest = rCtx.mpDest->GetScanline( nY );
for( long nX = nStartX, nXDst = 0; nX <= nEndX; nX++ )
{
long nTempX = rCtx.maMapIX[ nX ];
BilinearWeightType nTempFX = rCtx.maMapFX[ nX ];
BitmapColor aCol0 = rCtx.mpSrc->GetPixel( nTempY, nTempX );
BitmapColor aCol1 = rCtx.mpSrc->GetPixel( nTempY, ++nTempX );
sal_uInt8 cR0 = MAP( aCol0.GetRed(), aCol1.GetRed(), nTempFX );
sal_uInt8 cG0 = MAP( aCol0.GetGreen(), aCol1.GetGreen(), nTempFX );
sal_uInt8 cB0 = MAP( aCol0.GetBlue(), aCol1.GetBlue(), nTempFX );
aCol1 = rCtx.mpSrc->GetPixel( ++nTempY, nTempX );
aCol0 = rCtx.mpSrc->GetPixel( nTempY--, --nTempX );
sal_uInt8 cR1 = MAP( aCol0.GetRed(), aCol1.GetRed(), nTempFX );
sal_uInt8 cG1 = MAP( aCol0.GetGreen(), aCol1.GetGreen(), nTempFX );
sal_uInt8 cB1 = MAP( aCol0.GetBlue(), aCol1.GetBlue(), nTempFX );
BitmapColor aColRes( MAP( cR0, cR1, nTempFY ),
MAP( cG0, cG1, nTempFY ),
MAP( cB0, cB1, nTempFY ) );
rCtx.mpDest->SetPixelOnData( pScanDest, nXDst++, aColRes );
}
}
}
void scaleDown32bit(ScaleContext &rCtx, long nStartY, long nEndY)
{
const int constColorComponents = 4;
const long nStartX = 0;
const long nEndX = rCtx.mnDestW - 1;
for (long nY = nStartY; nY <= nEndY; nY++)
{
long nTop = rCtx.mbVMirr ? (nY + 1) : nY;
long nBottom = rCtx.mbVMirr ? nY : (nY + 1);
long nLineStart;
long nLineRange;
if (nY == nEndY)
{
nLineStart = rCtx.maMapIY[nY];
nLineRange = 0;
}
else
{
nLineStart = rCtx.maMapIY[nTop];
nLineRange = (rCtx.maMapIY[nBottom] == rCtx.maMapIY[nTop]) ?
1 : (rCtx.maMapIY[nBottom] - rCtx.maMapIY[nTop]);
}
Scanline pScanDest = rCtx.mpDest->GetScanline(nY);
for (long nX = nStartX; nX <= nEndX; nX++)
{
long nLeft = rCtx.mbHMirr ? (nX + 1) : nX;
long nRight = rCtx.mbHMirr ? nX : (nX + 1);
long nRowStart;
long nRowRange;
if (nX == nEndX)
{
nRowStart = rCtx.maMapIX[nX];
nRowRange = 0;
}
else
{
nRowStart = rCtx.maMapIX[nLeft];
nRowRange = (rCtx.maMapIX[nRight] == rCtx.maMapIX[nLeft]) ?
1 : (rCtx.maMapIX[nRight] - rCtx.maMapIX[nLeft]);
}
int nSum1 = 0;
int nSum2 = 0;
int nSum3 = 0;
int nSum4 = 0;
BilinearWeightType nTotalWeightY = 0;
for (long i = 0; i<= nLineRange; i++)
{
Scanline pTmpY = rCtx.mpSrc->GetScanline(nLineStart + i);
Scanline pTmpX = pTmpY + constColorComponents * nRowStart;
int nSumRow1 = 0;
int nSumRow2 = 0;
int nSumRow3 = 0;
int nSumRow4 = 0;
BilinearWeightType nTotalWeightX = 0;
for (long j = 0; j <= nRowRange; j++)
{
if (nX == nEndX)
{
nSumRow1 += (*pTmpX) << MAP_PRECISION; pTmpX++;
nSumRow2 += (*pTmpX) << MAP_PRECISION; pTmpX++;
nSumRow3 += (*pTmpX) << MAP_PRECISION; pTmpX++;
nSumRow4 += (*pTmpX) << MAP_PRECISION; pTmpX++;
nTotalWeightX += lclMaxWeight();
}
else if(j == 0)
{
BilinearWeightType nWeightX = lclMaxWeight() - rCtx.maMapFX[nLeft];
nSumRow1 += (nWeightX * (*pTmpX)); pTmpX++;
nSumRow2 += (nWeightX * (*pTmpX)); pTmpX++;
nSumRow3 += (nWeightX * (*pTmpX)); pTmpX++;
nSumRow4 += (nWeightX * (*pTmpX)); pTmpX++;
nTotalWeightX += nWeightX;
}
else if ( nRowRange == j )
{
BilinearWeightType nWeightX = rCtx.maMapFX[ nRight ] ;
nSumRow1 += (nWeightX * (*pTmpX)); pTmpX++;
nSumRow2 += (nWeightX * (*pTmpX)); pTmpX++;
nSumRow3 += (nWeightX * (*pTmpX)); pTmpX++;
nSumRow4 += (nWeightX * (*pTmpX)); pTmpX++;
nTotalWeightX += nWeightX;
}
else
{
nSumRow1 += (*pTmpX) << MAP_PRECISION; pTmpX++;
nSumRow2 += (*pTmpX) << MAP_PRECISION; pTmpX++;
nSumRow3 += (*pTmpX) << MAP_PRECISION; pTmpX++;
nSumRow4 += (*pTmpX) << MAP_PRECISION; pTmpX++;
nTotalWeightX += lclMaxWeight();
}
}
BilinearWeightType nWeightY = lclMaxWeight();
if (nY == nEndY)
nWeightY = lclMaxWeight();
else if (i == 0)
nWeightY = lclMaxWeight() - rCtx.maMapFY[nTop];
else if (nLineRange == 1)
nWeightY = rCtx.maMapFY[nTop];
else if (nLineRange == i)
nWeightY = rCtx.maMapFY[nBottom];
if (nTotalWeightX)
{
nSumRow1 /= nTotalWeightX;
nSumRow2 /= nTotalWeightX;
nSumRow3 /= nTotalWeightX;
nSumRow4 /= nTotalWeightX;
}
nSum1 += nWeightY * nSumRow1;
nSum2 += nWeightY * nSumRow2;
nSum3 += nWeightY * nSumRow3;
nSum4 += nWeightY * nSumRow4;
nTotalWeightY += nWeightY;
}
if (nTotalWeightY)
{
nSum1 /= nTotalWeightY;
nSum2 /= nTotalWeightY;
nSum3 /= nTotalWeightY;
nSum4 /= nTotalWeightY;
}
// Write the calculated color components to the destination
*pScanDest = nSum1; pScanDest++;
*pScanDest = nSum2; pScanDest++;
*pScanDest = nSum3; pScanDest++;
*pScanDest = nSum4; pScanDest++;
}
}
}
void scaleDownPalette8bit(ScaleContext &rCtx, long nStartY, long nEndY)
{
const long nStartX = 0, nEndX = rCtx.mnDestW - 1;
for( long nY = nStartY; nY <= nEndY; nY++ )
{
long nTop = rCtx.mbVMirr ? ( nY + 1 ) : nY;
long nBottom = rCtx.mbVMirr ? nY : ( nY + 1 ) ;
long nLineStart, nLineRange;
if( nY == nEndY )
{
nLineStart = rCtx.maMapIY[ nY ];
nLineRange = 0;
}
else
{
nLineStart = rCtx.maMapIY[ nTop ] ;
nLineRange = ( rCtx.maMapIY[ nBottom ] == rCtx.maMapIY[ nTop ] ) ? 1 :( rCtx.maMapIY[ nBottom ] - rCtx.maMapIY[ nTop ] );
}
Scanline pScanDest = rCtx.mpDest->GetScanline( nY );
for( long nX = nStartX , nXDst = 0; nX <= nEndX; nX++ )
{
long nLeft = rCtx.mbHMirr ? ( nX + 1 ) : nX;
long nRight = rCtx.mbHMirr ? nX : ( nX + 1 ) ;
long nRowStart;
long nRowRange;
if( nX == nEndX )
{
nRowStart = rCtx.maMapIX[ nX ];
nRowRange = 0;
}
else
{
nRowStart = rCtx.maMapIX[ nLeft ];
nRowRange = ( rCtx.maMapIX[ nRight ] == rCtx.maMapIX[ nLeft ] )? 1 : ( rCtx.maMapIX[ nRight ] - rCtx.maMapIX[ nLeft ] );
}
int nSumR = 0;
int nSumG = 0;
int nSumB = 0;
BilinearWeightType nTotalWeightY = 0;
for(long i = 0; i<= nLineRange; i++)
{
Scanline pTmpY = rCtx.mpSrc->GetScanline( nLineStart + i );
int nSumRowR = 0;
int nSumRowG = 0;
int nSumRowB = 0;
BilinearWeightType nTotalWeightX = 0;
for(long j = 0; j <= nRowRange; j++)
{
const BitmapColor& rCol = rCtx.mpSrc->GetPaletteColor( pTmpY[ nRowStart + j ] );
if(nX == nEndX )
{
nSumRowB += rCol.GetBlue() << MAP_PRECISION;
nSumRowG += rCol.GetGreen() << MAP_PRECISION;
nSumRowR += rCol.GetRed() << MAP_PRECISION;
nTotalWeightX += lclMaxWeight();
}
else if( j == 0 )
{
BilinearWeightType nWeightX = lclMaxWeight() - rCtx.maMapFX[ nLeft ];
nSumRowB += ( nWeightX *rCol.GetBlue()) ;
nSumRowG += ( nWeightX *rCol.GetGreen()) ;
nSumRowR += ( nWeightX *rCol.GetRed()) ;
nTotalWeightX += nWeightX;
}
else if ( nRowRange == j )
{
BilinearWeightType nWeightX = rCtx.maMapFX[ nRight ] ;
nSumRowB += ( nWeightX *rCol.GetBlue() );
nSumRowG += ( nWeightX *rCol.GetGreen() );
nSumRowR += ( nWeightX *rCol.GetRed() );
nTotalWeightX += nWeightX;
}
else
{
nSumRowB += rCol.GetBlue() << MAP_PRECISION;
nSumRowG += rCol.GetGreen() << MAP_PRECISION;
nSumRowR += rCol.GetRed() << MAP_PRECISION;
nTotalWeightX += lclMaxWeight();
}
}
BilinearWeightType nWeightY = lclMaxWeight();
if( nY == nEndY )
nWeightY = lclMaxWeight();
else if( i == 0 )
nWeightY = lclMaxWeight() - rCtx.maMapFY[ nTop ];
else if( nLineRange == 1 )
nWeightY = rCtx.maMapFY[ nTop ];
else if ( nLineRange == i )
nWeightY = rCtx.maMapFY[ nBottom ];
if (nTotalWeightX)
{
nSumRowB /= nTotalWeightX;
nSumRowG /= nTotalWeightX;
nSumRowR /= nTotalWeightX;
}
nSumB += nWeightY * nSumRowB;
nSumG += nWeightY * nSumRowG;
nSumR += nWeightY * nSumRowR;
nTotalWeightY += nWeightY;
}
if (nTotalWeightY)
{
nSumR /= nTotalWeightY;
nSumG /= nTotalWeightY;
nSumB /= nTotalWeightY;
}
BitmapColor aColRes(static_cast<sal_uInt8>(nSumR), static_cast<sal_uInt8>(nSumG), static_cast<sal_uInt8>(nSumB));
rCtx.mpDest->SetPixelOnData( pScanDest, nXDst++, aColRes );
}
}
}
void scaleDownPaletteGeneral(ScaleContext &rCtx, long nStartY, long nEndY)
{
const long nStartX = 0, nEndX = rCtx.mnDestW - 1;
for( long nY = nStartY; nY <= nEndY; nY++ )
{
long nTop = rCtx.mbVMirr ? ( nY + 1 ) : nY;
long nBottom = rCtx.mbVMirr ? nY : ( nY + 1 ) ;
long nLineStart, nLineRange;
if( nY ==nEndY )
{
nLineStart = rCtx.maMapIY[ nY ];
nLineRange = 0;
}
else
{
nLineStart = rCtx.maMapIY[ nTop ] ;
nLineRange = ( rCtx.maMapIY[ nBottom ] == rCtx.maMapIY[ nTop ] ) ? 1 :( rCtx.maMapIY[ nBottom ] - rCtx.maMapIY[ nTop ] );
}
Scanline pScanDest = rCtx.mpDest->GetScanline( nY );
for( long nX = nStartX , nXDst = 0; nX <= nEndX; nX++ )
{
long nLeft = rCtx.mbHMirr ? ( nX + 1 ) : nX;
long nRight = rCtx.mbHMirr ? nX : ( nX + 1 ) ;
long nRowStart, nRowRange;
if( nX == nEndX )
{
nRowStart = rCtx.maMapIX[ nX ];
nRowRange = 0;
}
else
{
nRowStart = rCtx.maMapIX[ nLeft ];
nRowRange = ( rCtx.maMapIX[ nRight ] == rCtx.maMapIX[ nLeft ] )? 1 : ( rCtx.maMapIX[ nRight ] - rCtx.maMapIX[ nLeft ] );
}
int nSumR = 0;
int nSumG = 0;
int nSumB = 0;
BilinearWeightType nTotalWeightY = 0;
for(long i = 0; i<= nLineRange; i++)
{
int nSumRowR = 0;
int nSumRowG = 0;
int nSumRowB = 0;
BilinearWeightType nTotalWeightX = 0;
Scanline pScanlineSrc = rCtx.mpSrc->GetScanline( nLineStart + i );
for(long j = 0; j <= nRowRange; j++)
{
BitmapColor aCol0 = rCtx.mpSrc->GetPaletteColor ( rCtx.mpSrc->GetIndexFromData( pScanlineSrc, nRowStart + j ) );
if(nX == nEndX )
{
nSumRowB += aCol0.GetBlue() << MAP_PRECISION;
nSumRowG += aCol0.GetGreen() << MAP_PRECISION;
nSumRowR += aCol0.GetRed() << MAP_PRECISION;
nTotalWeightX += lclMaxWeight();
}
else if( j == 0 )
{
BilinearWeightType nWeightX = lclMaxWeight() - rCtx.maMapFX[ nLeft ];
nSumRowB += ( nWeightX *aCol0.GetBlue()) ;
nSumRowG += ( nWeightX *aCol0.GetGreen()) ;
nSumRowR += ( nWeightX *aCol0.GetRed()) ;
nTotalWeightX += nWeightX;
}
else if ( nRowRange == j )
{
BilinearWeightType nWeightX = rCtx.maMapFX[ nRight ] ;
nSumRowB += ( nWeightX *aCol0.GetBlue() );
nSumRowG += ( nWeightX *aCol0.GetGreen() );
nSumRowR += ( nWeightX *aCol0.GetRed() );
nTotalWeightX += nWeightX;
}
else
{
nSumRowB += aCol0.GetBlue() << MAP_PRECISION;
nSumRowG += aCol0.GetGreen() << MAP_PRECISION;
nSumRowR += aCol0.GetRed() << MAP_PRECISION;
nTotalWeightX += lclMaxWeight();
}
}
long nWeightY = lclMaxWeight();
if( nY == nEndY )
nWeightY = lclMaxWeight();
else if( i == 0 )
nWeightY = lclMaxWeight() - rCtx.maMapFY[ nTop ];
else if( nLineRange == 1 )
nWeightY = rCtx.maMapFY[ nTop ];
else if ( nLineRange == i )
nWeightY = rCtx.maMapFY[ nBottom ];
if (nTotalWeightX)
{
nSumRowB /= nTotalWeightX;
nSumRowG /= nTotalWeightX;
nSumRowR /= nTotalWeightX;
}
nSumB += nWeightY * nSumRowB;
nSumG += nWeightY * nSumRowG;
nSumR += nWeightY * nSumRowR;
nTotalWeightY += nWeightY;
}
if (nTotalWeightY)
{
nSumR /= nTotalWeightY;
nSumG /= nTotalWeightY;
nSumB /= nTotalWeightY;
}
BitmapColor aColRes(static_cast<sal_uInt8>(nSumR), static_cast<sal_uInt8>(nSumG), static_cast<sal_uInt8>(nSumB));
rCtx.mpDest->SetPixelOnData( pScanDest, nXDst++, aColRes );
}
}
}
void scaleDown24bit(ScaleContext &rCtx, long nStartY, long nEndY)
{
const int constColorComponents = 3;
const long nStartX = 0;
const long nEndX = rCtx.mnDestW - 1;
for (long nY = nStartY; nY <= nEndY; nY++)
{
long nTop = rCtx.mbVMirr ? (nY + 1) : nY;
long nBottom = rCtx.mbVMirr ? nY : (nY + 1);
long nLineStart;
long nLineRange;
if (nY == nEndY)
{
nLineStart = rCtx.maMapIY[nY];
nLineRange = 0;
}
else
{
nLineStart = rCtx.maMapIY[nTop];
nLineRange = (rCtx.maMapIY[nBottom] == rCtx.maMapIY[nTop]) ?
1 : (rCtx.maMapIY[nBottom] - rCtx.maMapIY[nTop]);
}
Scanline pScanDest = rCtx.mpDest->GetScanline(nY);
for (long nX = nStartX; nX <= nEndX; nX++)
{
long nLeft = rCtx.mbHMirr ? (nX + 1) : nX;
long nRight = rCtx.mbHMirr ? nX : (nX + 1);
long nRowStart;
long nRowRange;
if (nX == nEndX)
{
nRowStart = rCtx.maMapIX[nX];
nRowRange = 0;
}
else
{
nRowStart = rCtx.maMapIX[nLeft];
nRowRange = (rCtx.maMapIX[nRight] == rCtx.maMapIX[nLeft]) ?
1 : (rCtx.maMapIX[nRight] - rCtx.maMapIX[nLeft]);
}
int nSum1 = 0;
int nSum2 = 0;
int nSum3 = 0;
BilinearWeightType nTotalWeightY = 0;
for (long i = 0; i<= nLineRange; i++)
{
Scanline pTmpY = rCtx.mpSrc->GetScanline(nLineStart + i);
Scanline pTmpX = pTmpY + constColorComponents * nRowStart;
int nSumRow1 = 0;
int nSumRow2 = 0;
int nSumRow3 = 0;
BilinearWeightType nTotalWeightX = 0;
for (long j = 0; j <= nRowRange; j++)
{
if (nX == nEndX)
{
nSumRow1 += (*pTmpX) << MAP_PRECISION; pTmpX++;
nSumRow2 += (*pTmpX) << MAP_PRECISION; pTmpX++;
nSumRow3 += (*pTmpX) << MAP_PRECISION; pTmpX++;
nTotalWeightX += lclMaxWeight();
}
else if(j == 0)
{
BilinearWeightType nWeightX = lclMaxWeight() - rCtx.maMapFX[nLeft];
nSumRow1 += (nWeightX * (*pTmpX)); pTmpX++;
nSumRow2 += (nWeightX * (*pTmpX)); pTmpX++;
nSumRow3 += (nWeightX * (*pTmpX)); pTmpX++;
nTotalWeightX += nWeightX;
}
else if ( nRowRange == j )
{
BilinearWeightType nWeightX = rCtx.maMapFX[ nRight ] ;
nSumRow1 += (nWeightX * (*pTmpX)); pTmpX++;
nSumRow2 += (nWeightX * (*pTmpX)); pTmpX++;
nSumRow3 += (nWeightX * (*pTmpX)); pTmpX++;
nTotalWeightX += nWeightX;
}
else
{
nSumRow1 += (*pTmpX) << MAP_PRECISION; pTmpX++;
nSumRow2 += (*pTmpX) << MAP_PRECISION; pTmpX++;
nSumRow3 += (*pTmpX) << MAP_PRECISION; pTmpX++;
nTotalWeightX += lclMaxWeight();
}
}
BilinearWeightType nWeightY = lclMaxWeight();
if (nY == nEndY)
nWeightY = lclMaxWeight();
else if (i == 0)
nWeightY = lclMaxWeight() - rCtx.maMapFY[nTop];
else if (nLineRange == 1)
nWeightY = rCtx.maMapFY[nTop];
else if (nLineRange == i)
nWeightY = rCtx.maMapFY[nBottom];
if (nTotalWeightX)
{
nSumRow1 /= nTotalWeightX;
nSumRow2 /= nTotalWeightX;
nSumRow3 /= nTotalWeightX;
}
nSum1 += nWeightY * nSumRow1;
nSum2 += nWeightY * nSumRow2;
nSum3 += nWeightY * nSumRow3;
nTotalWeightY += nWeightY;
}
if (nTotalWeightY)
{
nSum1 /= nTotalWeightY;
nSum2 /= nTotalWeightY;
nSum3 /= nTotalWeightY;
}
// Write the calculated color components to the destination
*pScanDest = nSum1; pScanDest++;
*pScanDest = nSum2; pScanDest++;
*pScanDest = nSum3; pScanDest++;
}
}
}
void scaleDownNonPaletteGeneral(ScaleContext &rCtx, long nStartY, long nEndY)
{
const long nStartX = 0, nEndX = rCtx.mnDestW - 1;
for( long nY = nStartY; nY <= nEndY; nY++ )
{
long nTop = rCtx.mbVMirr ? ( nY + 1 ) : nY;
long nBottom = rCtx.mbVMirr ? nY : ( nY + 1 ) ;
long nLineStart, nLineRange;
if( nY ==nEndY )
{
nLineStart = rCtx.maMapIY[ nY ];
nLineRange = 0;
}
else
{
nLineStart = rCtx.maMapIY[ nTop ] ;
nLineRange = ( rCtx.maMapIY[ nBottom ] == rCtx.maMapIY[ nTop ] ) ? 1 :( rCtx.maMapIY[ nBottom ] - rCtx.maMapIY[ nTop ] );
}
Scanline pScanDest = rCtx.mpDest->GetScanline( nY );
for( long nX = nStartX , nXDst = 0; nX <= nEndX; nX++ )
{
long nLeft = rCtx.mbHMirr ? ( nX + 1 ) : nX;
long nRight = rCtx.mbHMirr ? nX : ( nX + 1 ) ;
long nRowStart, nRowRange;
if( nX == nEndX )
{
nRowStart = rCtx.maMapIX[ nX ];
nRowRange = 0;
}
else
{
nRowStart = rCtx.maMapIX[ nLeft ];
nRowRange = ( rCtx.maMapIX[ nRight ] == rCtx.maMapIX[ nLeft ] )? 1 : ( rCtx.maMapIX[ nRight ] - rCtx.maMapIX[ nLeft ] );
}
int nSumR = 0;
int nSumG = 0;
int nSumB = 0;
BilinearWeightType nTotalWeightY = 0;
for(long i = 0; i<= nLineRange; i++)
{
int nSumRowR = 0;
int nSumRowG = 0;
int nSumRowB = 0;
BilinearWeightType nTotalWeightX = 0;
Scanline pScanlineSrc = rCtx.mpSrc->GetScanline( nLineStart + i );
for(long j = 0; j <= nRowRange; j++)
{
BitmapColor aCol0 = rCtx.mpSrc->GetPixelFromData( pScanlineSrc, nRowStart + j );
if(nX == nEndX )
{
nSumRowB += aCol0.GetBlue() << MAP_PRECISION;
nSumRowG += aCol0.GetGreen() << MAP_PRECISION;
nSumRowR += aCol0.GetRed() << MAP_PRECISION;
nTotalWeightX += lclMaxWeight();
}
else if( j == 0 )
{
BilinearWeightType nWeightX = lclMaxWeight() - rCtx.maMapFX[ nLeft ];
nSumRowB += ( nWeightX *aCol0.GetBlue()) ;
nSumRowG += ( nWeightX *aCol0.GetGreen()) ;
nSumRowR += ( nWeightX *aCol0.GetRed()) ;
nTotalWeightX += nWeightX;
}
else if ( nRowRange == j )
{
BilinearWeightType nWeightX = rCtx.maMapFX[ nRight ] ;
nSumRowB += ( nWeightX *aCol0.GetBlue() );
nSumRowG += ( nWeightX *aCol0.GetGreen() );
nSumRowR += ( nWeightX *aCol0.GetRed() );
nTotalWeightX += nWeightX;
}
else
{
nSumRowB += aCol0.GetBlue() << MAP_PRECISION;
nSumRowG += aCol0.GetGreen() << MAP_PRECISION;
nSumRowR += aCol0.GetRed() << MAP_PRECISION;
nTotalWeightX += lclMaxWeight();
}
}
BilinearWeightType nWeightY = lclMaxWeight();
if( nY == nEndY )
nWeightY = lclMaxWeight();
else if( i == 0 )
nWeightY = lclMaxWeight() - rCtx.maMapFY[ nTop ];
else if( nLineRange == 1 )
nWeightY = rCtx.maMapFY[ nTop ];
else if ( nLineRange == i )
nWeightY = rCtx.maMapFY[ nBottom ];
if (nTotalWeightX)
{
nSumRowB /= nTotalWeightX;
nSumRowG /= nTotalWeightX;
nSumRowR /= nTotalWeightX;
}
nSumB += nWeightY * nSumRowB;
nSumG += nWeightY * nSumRowG;
nSumR += nWeightY * nSumRowR;
nTotalWeightY += nWeightY;
}
if (nTotalWeightY)
{
nSumR /= nTotalWeightY;
nSumG /= nTotalWeightY;
nSumB /= nTotalWeightY;
}
BitmapColor aColRes(static_cast<sal_uInt8>(nSumR), static_cast<sal_uInt8>(nSumG), static_cast<sal_uInt8>(nSumB));
rCtx.mpDest->SetPixelOnData( pScanDest, nXDst++, aColRes );
}
}
}
} // end anonymous namespace
BitmapScaleSuperFilter::BitmapScaleSuperFilter(const double& rScaleX, const double& rScaleY) :
mrScaleX(rScaleX),
mrScaleY(rScaleY)
{}
BitmapScaleSuperFilter::~BitmapScaleSuperFilter()
{}
BitmapEx BitmapScaleSuperFilter::execute(BitmapEx const& rBitmap) const
{
Bitmap aBitmap(rBitmap.GetBitmap());
bool bRet = false;
const Size aSizePix(rBitmap.GetSizePixel());
bool bHMirr = mrScaleX < 0;<--- The scope of the variable 'bHMirr' can be reduced. [+]The scope of the variable 'bHMirr' can be reduced. Warning: Be careful when fixing this message, especially when there are inner loops. Here is an example where cppcheck will write that the scope for 'i' can be reduced:
void f(int x)
{
int i = 0;
if (x) {
// it's safe to move 'int i = 0;' here
for (int n = 0; n < 10; ++n) {
// it is possible but not safe to move 'int i = 0;' here
do_something(&i);
}
}
}
When you see this message it is always safe to reduce the variable scope 1 level.
bool bVMirr = mrScaleY < 0;<--- The scope of the variable 'bVMirr' can be reduced. [+]The scope of the variable 'bVMirr' can be reduced. Warning: Be careful when fixing this message, especially when there are inner loops. Here is an example where cppcheck will write that the scope for 'i' can be reduced:
void f(int x)
{
int i = 0;
if (x) {
// it's safe to move 'int i = 0;' here
for (int n = 0; n < 10; ++n) {
// it is possible but not safe to move 'int i = 0;' here
do_something(&i);
}
}
}
When you see this message it is always safe to reduce the variable scope 1 level.
double fScaleX = std::fabs(mrScaleX);
double fScaleY = std::fabs(mrScaleY);
const long nDstW = FRound(aSizePix.Width() * fScaleX);
const long nDstH = FRound(aSizePix.Height() * fScaleY);
const double fScaleThresh = 0.6;
if (nDstW <= 1 || nDstH <= 1)
return BitmapEx();
// check cache for a previously scaled version of this
ScaleCacheKey aKey(aBitmap.ImplGetSalBitmap().get(),
Size(nDstW, nDstH));
ImplSVData* pSVData = ImplGetSVData();
auto& rCache = pSVData->maGDIData.maScaleCache;
auto aFind = rCache.find(aKey);
if (aFind != rCache.end())
{
if (aFind->second.GetSizePixel().Width() == nDstW && aFind->second.GetSizePixel().Height() == nDstH)
return aFind->second;
else
SAL_WARN("vcl.gdi", "Error: size mismatch in scale cache");
}
{
Bitmap::ScopedReadAccess pReadAccess(aBitmap);
sal_uInt16 nSourceBitcount = aBitmap.GetBitCount();
Bitmap aOutBmp(Size(nDstW, nDstH), std::max(nSourceBitcount, sal_uInt16(24)));
Size aOutSize = aOutBmp.GetSizePixel();
sal_uInt16 nTargetBitcount = aOutBmp.GetBitCount();
if (!aOutSize.Width() || !aOutSize.Height())
{
SAL_WARN("vcl.gdi", "bmp creation failed");
return BitmapEx();
}
BitmapScopedWriteAccess pWriteAccess(aOutBmp);
const long nStartY = 0;
const long nEndY = nDstH - 1;
if (pReadAccess && pWriteAccess)
{
ScaleRangeFn pScaleRangeFn;
ScaleContext aContext( pReadAccess.get(),
pWriteAccess.get(),
pReadAccess->Width(),
pWriteAccess->Width(),
pReadAccess->Height(),
pWriteAccess->Height(),
bVMirr, bHMirr );
bool bScaleUp = fScaleX >= fScaleThresh && fScaleY >= fScaleThresh;
// If we have a source bitmap with a palette the scaling converts
// from up to 8 bit image -> 24 bit non-palette, which is then
// adapted back to the same type as original.
if (pReadAccess->HasPalette())
{
switch( pReadAccess->GetScanlineFormat() )
{
case ScanlineFormat::N8BitPal:
pScaleRangeFn = bScaleUp ? scaleUpPalette8bit
: scaleDownPalette8bit;
break;
default:
pScaleRangeFn = bScaleUp ? scaleUpPaletteGeneral
: scaleDownPaletteGeneral;
break;
}
}
// Here we know that we are dealing with a non-palette source bitmap.
// The target is either 24 or 32 bit, depending on the image and
// the capabilities of the backend. If for some reason the destination
// is not the same bit-depth as the source, then we can't use
// a fast path, so we always need to process with a general scaler.
else if (nSourceBitcount != nTargetBitcount)
{
pScaleRangeFn = bScaleUp ? scaleUpNonPaletteGeneral : scaleDownNonPaletteGeneral;
}
// If we get here then we can only use a fast path, but let's
// still keep the fallback to the general scaler alive.
else
{
switch( pReadAccess->GetScanlineFormat() )
{
case ScanlineFormat::N24BitTcBgr:
case ScanlineFormat::N24BitTcRgb:
pScaleRangeFn = bScaleUp ? scaleUp24bit : scaleDown24bit;
break;
case ScanlineFormat::N32BitTcRgba:
case ScanlineFormat::N32BitTcBgra:
case ScanlineFormat::N32BitTcArgb:
case ScanlineFormat::N32BitTcAbgr:
pScaleRangeFn = bScaleUp ? scaleUp32bit : scaleDown32bit;
break;
default:
pScaleRangeFn = bScaleUp ? scaleUpNonPaletteGeneral
: scaleDownNonPaletteGeneral;
break;
}
}
// We want to thread - only if there is a lot of work to do:
// We work hard when there is a large destination image, or
// A large source image.
bool bHorizontalWork = pReadAccess->Height() >= 512 && pReadAccess->Width() >= 512;
bool bUseThreads = true;
static bool bDisableThreadedScaling = getenv ("VCL_NO_THREAD_SCALE");
if (bDisableThreadedScaling || !bHorizontalWork)
{
SAL_INFO("vcl.gdi", "Scale in main thread");
bUseThreads = false;
}
if (bUseThreads)
{
try
{
// partition and queue work
comphelper::ThreadPool &rShared = comphelper::ThreadPool::getSharedOptimalPool();
std::shared_ptr<comphelper::ThreadTaskTag> pTag = comphelper::ThreadPool::createThreadTaskTag();
long nStripYStart = nStartY;
long nStripYEnd = nStripYStart + constScaleThreadStrip - 1;
while (nStripYEnd < nEndY)
{
std::unique_ptr<ScaleTask> pTask(new ScaleTask(pTag, pScaleRangeFn, aContext, nStripYStart, nStripYEnd));
rShared.pushTask(std::move(pTask));
nStripYStart += constScaleThreadStrip;
nStripYEnd += constScaleThreadStrip;
}
if (nStripYStart <= nEndY)
{
std::unique_ptr<ScaleTask> pTask(new ScaleTask(pTag, pScaleRangeFn, aContext, nStripYStart, nEndY));
rShared.pushTask(std::move(pTask));
}
rShared.waitUntilDone(pTag);
SAL_INFO("vcl.gdi", "All threaded scaling tasks complete");
}
catch (...)
{
SAL_WARN("vcl.gdi", "threaded bitmap scaling failed");
bUseThreads = false;
}
}
if (!bUseThreads)
pScaleRangeFn( aContext, nStartY, nEndY );
pWriteAccess.reset();
bRet = true;
aBitmap.AdaptBitCount(aOutBmp);
aBitmap = aOutBmp;
}
}
if (bRet)
{
tools::Rectangle aRect(Point(0, 0), Point(nDstW, nDstH));
aBitmap.Crop(aRect);
BitmapEx aRet(aBitmap);
rCache.insert(std::make_pair(aKey, aRet));
return aRet;
}
return BitmapEx();
}
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