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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 <salbmp.hxx>
void SalBitmap::updateChecksum() const
{
if (mbChecksumValid)
return;
BitmapChecksum nCrc = 0;
SalBitmap* pThis = const_cast<SalBitmap*>(this);
BitmapBuffer* pBuf = pThis->AcquireBuffer(BitmapAccessMode::Read);
if (pBuf)
{
nCrc = pBuf->maPalette.GetChecksum();
nCrc = vcl_get_checksum(nCrc, pBuf->mpBits, pBuf->mnScanlineSize * pBuf->mnHeight);
pThis->ReleaseBuffer(pBuf, BitmapAccessMode::Read);
pThis->mnChecksum = nCrc;
pThis->mbChecksumValid = true;
}
else
{
pThis->mbChecksumValid = false;
}
}
namespace
{
class ImplPixelFormat
{
protected:
const sal_uInt8* mpData;
public:
static ImplPixelFormat* GetFormat( sal_uInt16 nBits, const BitmapPalette& rPalette );
virtual void StartLine( const sal_uInt8* pLine ) { mpData = pLine; }
virtual const BitmapColor& ReadPixel() = 0;
virtual ~ImplPixelFormat() { }
};
class ImplPixelFormat8 : public ImplPixelFormat
{
private:
const BitmapPalette& mrPalette;
public:
explicit ImplPixelFormat8( const BitmapPalette& rPalette )
: mrPalette( rPalette )
{
}
virtual const BitmapColor& ReadPixel() override
{
assert( mrPalette.GetEntryCount() > *mpData );
return mrPalette[ *mpData++ ];
}
};
class ImplPixelFormat4 : public ImplPixelFormat
{
private:
const BitmapPalette& mrPalette;
sal_uInt32 mnX;
sal_uInt32 mnShift;
public:
explicit ImplPixelFormat4( const BitmapPalette& rPalette )
: mrPalette( rPalette )
, mnX(0)
, mnShift(4)
{
}
virtual void StartLine( const sal_uInt8* pLine ) override
{
mpData = pLine;
mnX = 0;
mnShift = 4;
}
virtual const BitmapColor& ReadPixel() override
{
sal_uInt32 nIdx = ( mpData[mnX >> 1] >> mnShift) & 0x0f;
assert( mrPalette.GetEntryCount() > nIdx );
const BitmapColor& rColor = mrPalette[nIdx];
mnX++;
mnShift ^= 4;
return rColor;
}
};
class ImplPixelFormat1 : public ImplPixelFormat
{
private:
const BitmapPalette& mrPalette;
sal_uInt32 mnX;
public:
explicit ImplPixelFormat1( const BitmapPalette& rPalette )
: mrPalette(rPalette)
, mnX(0)
{
}
virtual void StartLine( const sal_uInt8* pLine ) override
{
mpData = pLine;
mnX = 0;
}
virtual const BitmapColor& ReadPixel() override
{
const BitmapColor& rColor = mrPalette[ (mpData[mnX >> 3 ] >> ( 7 - ( mnX & 7 ) )) & 1];
mnX++;
return rColor;
}
};
ImplPixelFormat* ImplPixelFormat::GetFormat( sal_uInt16 nBits, const BitmapPalette& rPalette )
{
switch( nBits )
{
case 1: return new ImplPixelFormat1( rPalette );
case 4: return new ImplPixelFormat4( rPalette );
case 8: return new ImplPixelFormat8( rPalette );
}
return nullptr;
}
} // namespace
std::unique_ptr< sal_uInt8[] > SalBitmap::convertDataBitCount( const sal_uInt8* src,
int width, int height, int bitCount, int bytesPerRow, const BitmapPalette& palette, BitConvert type )
{
assert( bitCount == 1 || bitCount == 4 || bitCount == 8 );
static const int bpp[] = { 1, 3, 3, 4, 4 };
std::unique_ptr< sal_uInt8[] > data( new sal_uInt8[width * height * bpp[ static_cast<int>(type) ]] );
if(type == BitConvert::A8 && bitCount == 8 && palette.IsGreyPalette8Bit())
{ // no actual data conversion
for( int y = 0; y < height; ++y )
memcpy( data.get() + y * width, src + y * bytesPerRow, width );
return data;
}
std::unique_ptr<ImplPixelFormat> pSrcFormat(ImplPixelFormat::GetFormat(bitCount, palette));
const sal_uInt8* pSrcData = src;
sal_uInt8* pDstData = data.get();
sal_uInt32 nY = height;
while( nY-- )
{
pSrcFormat->StartLine( pSrcData );
sal_uInt32 nX = width;
switch( type )
{
case BitConvert::A8 :
while( nX-- )
{
const BitmapColor& c = pSrcFormat->ReadPixel();
*pDstData++ = c.GetBlue();
}
break;
case BitConvert::BGR :
while( nX-- )
{
const BitmapColor& c = pSrcFormat->ReadPixel();
*pDstData++ = c.GetBlue();
*pDstData++ = c.GetGreen();
*pDstData++ = c.GetRed();
}
break;
case BitConvert::RGB :
while( nX-- )
{
const BitmapColor& c = pSrcFormat->ReadPixel();
*pDstData++ = c.GetRed();
*pDstData++ = c.GetGreen();
*pDstData++ = c.GetBlue();
}
break;
case BitConvert::BGRA :
while( nX-- )
{
const BitmapColor& c = pSrcFormat->ReadPixel();
*pDstData++ = c.GetBlue();
*pDstData++ = c.GetGreen();
*pDstData++ = c.GetRed();
*pDstData++ = 0xff;
}
break;
case BitConvert::RGBA :
while( nX-- )
{
const BitmapColor& c = pSrcFormat->ReadPixel();
*pDstData++ = c.GetRed();
*pDstData++ = c.GetGreen();
*pDstData++ = c.GetBlue();
*pDstData++ = 0xff;
}
break;
}
pSrcData += bytesPerRow;
}
return data;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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