/* -*- 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 <vcl/BitmapReadAccess.hxx>
#include <vcl/salgtype.hxx>
#include <bitmap/bmpfast.hxx>
#include <o3tl/safeint.hxx>
#include <osl/diagnose.h>
#include <sal/log.hxx>
#include <tools/helpers.hxx>
#include <memory>
#define IMPL_CASE_SET_FORMAT( Format, BitCount ) \
case ( ScanlineFormat::Format ): \
{ \
pFncSetPixel = BitmapReadAccess::SetPixelFor
## Format; \
pDstBuffer->mnBitCount = BitCount; \
} \
break
#define DOUBLE_SCANLINES() \
while ( ( nActY < nHeight1 ) && ( pMapY[ nActY + 1 ] == nMapY ) ) \
{ \
memcpy( pDstScanMap[ nActY + 1 ], pDstScan, rDstBuffer.mnScanlineSize ); \
nActY++; \
}
constexpr
int TC_TO_PAL_COLORS = 4096;
static tools::
Long ImplIndexFromColor(
const BitmapColor& rCol )
{
return ( (
static_cast <tools::
Long >(rCol.GetBlue()) >> 4) << 8 ) |
( (
static_cast <tools::
Long >(rCol.GetGreen()) >> 4 ) << 4 ) |
(
static_cast <tools::
Long >(rCol.GetRed()) >> 4 );
}
static void ImplPALToPAL(
const BitmapBuffer& rSrcBuffer, BitmapBuffer& rDstBuf
fer,
FncGetPixel pFncGetPixel, FncSetPixel pFncSetPixel,
Scanline* pSrcScanMap, Scanline* pDstScanMap, sal_Int32 const * pMapX, const sal_Int32* pMapY )
{
const tools::Long nHeight1 = rDstBuffer.mnHeight - 1;
BitmapPalette aColMap( rSrcBuffer.maPalette.GetEntryCount() );
BitmapColor* pColMapBuf = aColMap.ImplGetColorBuffer();
BitmapColor aIndex( 0 );
for ( sal_uInt16 i = 0, nSrcCount = aColMap.GetEntryCount(), nDstCount = rDstBuffer.maPalette.GetEntryCount(); i < nSrcCount; i++ )
{
if ( ( i < nDstCount ) && ( rSrcBuffer.maPalette[ i ] == rDstBuffer.maPalette[ i ] ) )
aIndex.SetIndex( sal::static_int_cast<sal_uInt8>(i) );
else
aIndex.SetIndex( sal::static_int_cast<sal_uInt8>(rDstBuffer.maPalette.GetBestIndex( rSrcBuffer.maPalette[ i ] )) );
pColMapBuf[ i ] = aIndex;
}
for (tools::Long nActY = 0; nActY < rDstBuffer.mnHeight; ++nActY)
{
tools::Long nMapY = pMapY[nActY];
Scanline pSrcScan(pSrcScanMap[nMapY]), pDstScan(pDstScanMap[nActY]);
for (tools::Long nX = 0; nX < rDstBuffer.mnWidth; ++nX)
pFncSetPixel( pDstScan, nX, pColMapBuf[ pFncGetPixel( pSrcScan, pMapX[ nX ] ).GetIndex() ] );
DOUBLE_SCANLINES();
}
}
static void ImplPALToTC( const BitmapBuffer& rSrcBuffer, BitmapBuffer const & rDstBuffer,
FncGetPixel pFncGetPixel, FncSetPixel pFncSetPixel,
Scanline* pSrcScanMap, Scanline* pDstScanMap, sal_Int32 const * pMapX, const sal_Int32* pMapY )
{
const tools::Long nHeight1 = rDstBuffer.mnHeight - 1;
const BitmapColor* pColBuf = rSrcBuffer.maPalette.ImplGetColorBuffer();
if (rSrcBuffer.meFormat == ScanlineFormat::N1BitMsbPal)
{
const BitmapColor aCol0( pColBuf[ 0 ] );
const BitmapColor aCol1( pColBuf[ 1 ] );
tools::Long nMapX;
for (tools::Long nActY = 0; nActY < rDstBuffer.mnHeight; ++nActY)
{
tools::Long nMapY = pMapY[nActY];
Scanline pSrcScan(pSrcScanMap[nMapY]), pDstScan(pDstScanMap[nActY]);
for (tools::Long nX = 0; nX < rDstBuffer.mnWidth;)
{
nMapX = pMapX[ nX ];
pFncSetPixel( pDstScan, nX++,
pSrcScan[ nMapX >> 3 ] & ( 1 << ( 7 - ( nMapX & 7 ) ) ) ? aCol1 : aCol0 );
}
DOUBLE_SCANLINES();
}
}
else if (rSrcBuffer.meFormat == ScanlineFormat::N8BitPal)
{
for (tools::Long nActY = 0; nActY < rDstBuffer.mnHeight; ++nActY)
{
tools::Long nMapY = pMapY[nActY];
Scanline pSrcScan(pSrcScanMap[nMapY]), pDstScan(pDstScanMap[nActY]);
for (tools::Long nX = 0; nX < rDstBuffer.mnWidth; ++nX)
pFncSetPixel( pDstScan, nX, pColBuf[ pSrcScan[ pMapX[ nX ] ] ] );
DOUBLE_SCANLINES();
}
}
else
{
for (tools::Long nActY = 0; nActY < rDstBuffer.mnHeight; ++nActY)
{
tools::Long nMapY = pMapY[nActY];
Scanline pSrcScan(pSrcScanMap[nMapY]), pDstScan(pDstScanMap[nActY]);
for (tools::Long nX = 0; nX < rDstBuffer.mnWidth; ++nX)
pFncSetPixel( pDstScan, nX, pColBuf[ pFncGetPixel( pSrcScan, pMapX[ nX ] ).GetIndex() ] );
DOUBLE_SCANLINES();
}
}
}
static void ImplTCToTC( const BitmapBuffer& rSrcBuffer, BitmapBuffer const & rDstBuffer,
FncGetPixel pFncGetPixel, FncSetPixel pFncSetPixel,
Scanline* pSrcScanMap, Scanline* pDstScanMap, sal_Int32 const * pMapX, const sal_Int32* pMapY )
{
const tools::Long nHeight1 = rDstBuffer.mnHeight - 1;
if (rSrcBuffer.meFormat == ScanlineFormat::N24BitTcBgr)
{
BitmapColor aCol;
sal_uInt8* pPixel = nullptr;
for (tools::Long nActY = 0; nActY < rDstBuffer.mnHeight; ++nActY)
{
tools::Long nMapY = pMapY[nActY];
Scanline pSrcScan(pSrcScanMap[nMapY]), pDstScan(pDstScanMap[nActY]);
for (tools::Long nX = 0; nX < rDstBuffer.mnWidth; ++nX)
{
pPixel = pSrcScan + pMapX[ nX ] * 3;
aCol.SetBlue( *pPixel++ );
aCol.SetGreen( *pPixel++ );
aCol.SetRed( *pPixel );
pFncSetPixel( pDstScan, nX, aCol );
}
DOUBLE_SCANLINES()
}
}
else
{
for (tools::Long nActY = 0; nActY < rDstBuffer.mnHeight; ++nActY)
{
tools::Long nMapY = pMapY[nActY];
Scanline pSrcScan(pSrcScanMap[nMapY]), pDstScan(pDstScanMap[nActY]);
for (tools::Long nX = 0; nX < rDstBuffer.mnWidth; ++nX)
pFncSetPixel( pDstScan, nX, pFncGetPixel( pSrcScan, pMapX[ nX ] ) );
DOUBLE_SCANLINES();
}
}
}
static void ImplTCToPAL( BitmapBuffer const & rDstBuffer,
FncGetPixel pFncGetPixel, FncSetPixel pFncSetPixel,
Scanline* pSrcScanMap, Scanline* pDstScanMap, sal_Int32 const * pMapX, const sal_Int32* pMapY )
{
const tools::Long nHeight1 = rDstBuffer.mnHeight- 1;
std::unique_ptr<sal_uInt8[]> pColToPalMap(new sal_uInt8[ TC_TO_PAL_COLORS ]);
BitmapColor aIndex( 0 );
for ( tools::Long nR = 0; nR < 16; nR++ )
{
for ( tools::Long nG = 0; nG < 16; nG++ )
{
for ( tools::Long nB = 0; nB < 16; nB++ )
{
BitmapColor aCol( sal::static_int_cast<sal_uInt8>(nR << 4),
sal::static_int_cast<sal_uInt8>(nG << 4),
sal::static_int_cast<sal_uInt8>(nB << 4) );
pColToPalMap[ ImplIndexFromColor( aCol ) ] = static_cast <sal_uInt8>(rDstBuffer.maPalette.GetBestIndex( aCol ));
}
}
}
for (tools::Long nActY = 0; nActY < rDstBuffer.mnHeight; ++nActY)
{
tools::Long nMapY = pMapY[nActY];
Scanline pSrcScan(pSrcScanMap[nMapY]), pDstScan(pDstScanMap[nActY]);
for (tools::Long nX = 0; nX < rDstBuffer.mnWidth; ++nX)
{
aIndex.SetIndex( pColToPalMap[ ImplIndexFromColor( pFncGetPixel( pSrcScan, pMapX[ nX ] ) ) ] );
pFncSetPixel( pDstScan, nX, aIndex );
}
DOUBLE_SCANLINES();
}
}
std::optional<BitmapBuffer> StretchAndConvert(
const BitmapBuffer& rSrcBuffer, const SalTwoRect& rTwoRect,
ScanlineFormat nDstBitmapFormat, std::optional<BitmapPalette> pDstPal )
{
FncGetPixel pFncGetPixel;
FncSetPixel pFncSetPixel;
std::optional<BitmapBuffer> pDstBuffer(std::in_place);
pDstBuffer->meDirection = rSrcBuffer.meDirection;
// set function for getting pixels
pFncGetPixel = BitmapReadAccess::GetPixelFunction(rSrcBuffer.meFormat);
if ( !pFncGetPixel )
{
// should never come here
// initialize pFncGetPixel to something valid that is
// least likely to crash
pFncGetPixel = BitmapReadAccess::GetPixelForN1BitMsbPal;
OSL_FAIL( "unknown read format" );
}
// set function for setting pixels
switch (nDstBitmapFormat)
{
IMPL_CASE_SET_FORMAT( N1BitMsbPal, 1 );
IMPL_CASE_SET_FORMAT( N8BitPal, 8 );
IMPL_CASE_SET_FORMAT( N24BitTcBgr, 24 );
IMPL_CASE_SET_FORMAT( N24BitTcRgb, 24 );
IMPL_CASE_SET_FORMAT( N32BitTcAbgr, 32 );
IMPL_CASE_SET_FORMAT( N32BitTcXbgr, 32 );
IMPL_CASE_SET_FORMAT( N32BitTcArgb, 32 );
IMPL_CASE_SET_FORMAT( N32BitTcXrgb, 32 );
IMPL_CASE_SET_FORMAT( N32BitTcBgra, 32 );
IMPL_CASE_SET_FORMAT( N32BitTcBgrx, 32 );
IMPL_CASE_SET_FORMAT( N32BitTcRgba, 32 );
IMPL_CASE_SET_FORMAT( N32BitTcRgbx, 32 );
default :
// should never come here
// initialize pFncSetPixel to something valid that is
// least likely to crash
pFncSetPixel = BitmapReadAccess::SetPixelForN1BitMsbPal;
pDstBuffer->mnBitCount = 1;
assert(false && "unknown write format" );
break ;
}
// fill destination buffer
pDstBuffer->meFormat = nDstBitmapFormat;
pDstBuffer->mnWidth = rTwoRect.mnDestWidth;
pDstBuffer->mnHeight = rTwoRect.mnDestHeight;
tools::Long nScanlineBase;
bool bFail = o3tl::checked_multiply<tools::Long >(pDstBuffer->mnBitCount, pDstBuffer->mnWidth, nScanlineBase);
if (bFail)
{
SAL_WARN("vcl.gdi" , "checked multiply failed" );
pDstBuffer->mpBits = nullptr;
return std::nullopt;
}
pDstBuffer->mnScanlineSize = AlignedWidth4Bytes(nScanlineBase);
if (pDstBuffer->mnScanlineSize < nScanlineBase/8)
{
SAL_WARN("vcl.gdi" , "scanline calculation wraparound" );
pDstBuffer->mpBits = nullptr;
return std::nullopt;
}
try
{
pDstBuffer->mpBits = new sal_uInt8[ pDstBuffer->mnScanlineSize * pDstBuffer->mnHeight ];
}
catch ( const std::bad_alloc& )
{
// memory exception, clean up
pDstBuffer->mpBits = nullptr;
return std::nullopt;
}
// do we need a destination palette or color mask?
if (nDstBitmapFormat == ScanlineFormat::N1BitMsbPal ||
nDstBitmapFormat == ScanlineFormat::N8BitPal)
{
assert(pDstPal && "destination buffer requires palette" );
if (!pDstPal)
{
return std::nullopt;
}
pDstBuffer->maPalette = *pDstPal;
}
// short circuit the most important conversions
bool bFastConvert = ImplFastBitmapConversion( *pDstBuffer, rSrcBuffer, rTwoRect );
if ( bFastConvert )
return pDstBuffer;
std::unique_ptr<Scanline[]> pSrcScan;
std::unique_ptr<Scanline[]> pDstScan;
std::unique_ptr<sal_Int32[]> pMapX;
std::unique_ptr<sal_Int32[]> pMapY;
try
{
pSrcScan.reset(new Scanline[rSrcBuffer.mnHeight]);
pDstScan.reset(new Scanline[pDstBuffer->mnHeight]);
pMapX.reset(new sal_Int32[pDstBuffer->mnWidth]);
pMapY.reset(new sal_Int32[pDstBuffer->mnHeight]);
}
catch ( const std::bad_alloc& )
{
// memory exception, clean up
// remark: the buffer ptr causing the exception
// is still NULL here
return std::nullopt;
}
// horizontal mapping table
if ( (pDstBuffer->mnWidth != rTwoRect.mnSrcWidth) && (pDstBuffer->mnWidth != 0) )
{
const double fFactorX = static_cast <double >(rTwoRect.mnSrcWidth) / pDstBuffer->mnWidth;
for (tools::Long i = 0; i < pDstBuffer->mnWidth; ++i)
pMapX[ i ] = rTwoRect.mnSrcX + static_cast <int >( i * fFactorX );
}
else
{
for (tools::Long i = 0, nTmp = rTwoRect.mnSrcX ; i < pDstBuffer->mnWidth; ++i)
pMapX[ i ] = nTmp++;
}
// vertical mapping table
if ( (pDstBuffer->mnHeight != rTwoRect.mnSrcHeight) && (pDstBuffer->mnHeight != 0) )
{
const double fFactorY = static_cast <double >(rTwoRect.mnSrcHeight) / pDstBuffer->mnHeight;
for (tools::Long i = 0; i < pDstBuffer->mnHeight; ++i)
pMapY[ i ] = rTwoRect.mnSrcY + static_cast <int >( i * fFactorY );
}
else
{
for (tools::Long i = 0, nTmp = rTwoRect.mnSrcY; i < pDstBuffer->mnHeight; ++i)
pMapY[ i ] = nTmp++;
}
// source scanline buffer
Scanline pTmpScan;
tools::Long nOffset;
if (rSrcBuffer.meDirection == ScanlineDirection::TopDown)
{
pTmpScan = rSrcBuffer.mpBits;
nOffset = rSrcBuffer.mnScanlineSize;
}
else
{
pTmpScan = rSrcBuffer.mpBits + ( rSrcBuffer.mnHeight - 1 ) * rSrcBuffer.mnScanlineSize;
nOffset = -rSrcBuffer.mnScanlineSize;
}
for (tools::Long i = 0; i < rSrcBuffer.mnHeight; i++, pTmpScan += nOffset)
pSrcScan[ i ] = pTmpScan;
// destination scanline buffer
if (pDstBuffer->meDirection == ScanlineDirection::TopDown)
{
pTmpScan = pDstBuffer->mpBits;
nOffset = pDstBuffer->mnScanlineSize;
}
else
{
pTmpScan = pDstBuffer->mpBits + ( pDstBuffer->mnHeight - 1 ) * pDstBuffer->mnScanlineSize;
nOffset = -pDstBuffer->mnScanlineSize;
}
for (tools::Long i = 0; i < pDstBuffer->mnHeight; i++, pTmpScan += nOffset)
pDstScan[ i ] = pTmpScan;
// do buffer scaling and conversion
if ( rSrcBuffer.mnBitCount <= 8 && pDstBuffer->mnBitCount <= 8 )
{
ImplPALToPAL( rSrcBuffer, *pDstBuffer, pFncGetPixel, pFncSetPixel,
pSrcScan.get(), pDstScan.get(), pMapX.get(), pMapY.get() );
}
else if ( rSrcBuffer.mnBitCount <= 8 && pDstBuffer->mnBitCount > 8 )
{
ImplPALToTC( rSrcBuffer, *pDstBuffer, pFncGetPixel, pFncSetPixel,
pSrcScan.get(), pDstScan.get(), pMapX.get(), pMapY.get() );
}
else if ( rSrcBuffer.mnBitCount > 8 && pDstBuffer->mnBitCount > 8 )
{
ImplTCToTC( rSrcBuffer, *pDstBuffer, pFncGetPixel, pFncSetPixel,
pSrcScan.get(), pDstScan.get(), pMapX.get(), pMapY.get() );
}
else
{
ImplTCToPAL( *pDstBuffer, pFncGetPixel, pFncSetPixel,
pSrcScan.get(), pDstScan.get(), pMapX.get(), pMapY.get() );
}
return pDstBuffer;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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