/* -*- 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>
#include <o3tl/enumarray.hxx>
#include <rtl/crc.h>
static BitmapChecksum scanlineChecksum(BitmapChecksum nCrc, const sal_uInt8* bits, int lineBitsCount, sal_uInt8 extraBitsMask)
{
if( lineBitsCount / 8 > 0 )
nCrc = rtl_crc32( nCrc, bits, lineBitsCount / 8 );
if( extraBitsMask != 0 )
{
sal_uInt8 extraByte = bits[ lineBitsCount / 8 ] & extraBitsMask;
nCrc = rtl_crc32( nCrc, &extraByte, 1 );
}
return nCrc;
}
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();
const int lineBitsCount = pBuf->mnWidth * pBuf->mnBitCount;
// With 1bpp/4bpp format we need to check only used bits in the last byte.
sal_uInt8 extraBitsMask = 0;
if( lineBitsCount % 8 != 0 )
{
const int extraBitsCount = lineBitsCount % 8;
switch (pBuf->meFormat)
{
case ScanlineFormat::N1BitMsbPal:
{
static const sal_uInt8 mask1Bit[] = { 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
extraBitsMask = mask1Bit[ extraBitsCount ];
break;
}
default:
break;
}
}
if (pBuf->meDirection == ScanlineDirection::TopDown)
{
if( pBuf->mnScanlineSize == lineBitsCount / 8 )
nCrc = rtl_crc32(nCrc, pBuf->mpBits, pBuf->mnScanlineSize * pBuf->mnHeight);
else // Do not include padding with undefined content in the checksum.
for( tools::Long y = 0; y < pBuf->mnHeight; ++y )
nCrc = scanlineChecksum(nCrc, pBuf->mpBits + y * pBuf->mnScanlineSize, lineBitsCount, extraBitsMask);
}
else // Compute checksum in the order of scanlines, to make it consistent between different bitmap implementations.
{
for( tools::Long y = pBuf->mnHeight - 1; y >= 0; --y )
nCrc = scanlineChecksum(nCrc, pBuf->mpBits + y * pBuf->mnScanlineSize, lineBitsCount, extraBitsMask);
}
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;
}
// Optimized conversion from 1bpp. Currently LO uses 1bpp bitmaps for masks, which is nowadays
// a lousy obsolete format, as the memory saved is just not worth the cost of fiddling with the bits.
// Ideally LO should move to RGBA bitmaps. Until then, try to be faster with 1bpp bitmaps.
typedef void(*WriteColorFunction)( sal_uInt8 color8Bit, sal_uInt8*& dst );
void writeColorA8(sal_uInt8 color8Bit, sal_uInt8*& dst ) { *dst++ = color8Bit; };
void writeColorRGBA(sal_uInt8 color8Bit, sal_uInt8*& dst ) { *dst++ = color8Bit; *dst++ = color8Bit; *dst++ = color8Bit; *dst++ = 0xff; };
typedef void(*WriteBlackWhiteFunction)( sal_uInt8*& dst, int count );
void writeBlackA8(sal_uInt8*& dst, int count ) { memset( dst, 0, count ); dst += count; };
void writeWhiteA8(sal_uInt8*& dst, int count ) { memset( dst, 0xff, count ); dst += count; };
void writeWhiteRGBA(sal_uInt8*& dst, int count ) { memset( dst, 0xff, count * 4 ); dst += count * 4; };
void writeBlackRGBA(sal_uInt8*& dst, int count )
{
for( int i = 0; i < count; ++i )
{
dst[0] = 0x00;
dst[1] = 0x00;
dst[2] = 0x00;
dst[3] = 0xff;
dst += 4;
}
};
template< WriteColorFunction func, WriteBlackWhiteFunction funcBlack, WriteBlackWhiteFunction funcWhite >
void writeBlackWhiteData( const sal_uInt8* src, sal_uInt8* dst, int width, int height, int bytesPerRow )
{
for( int y = 0; y < height; ++y )
{
const sal_uInt8* srcLine = src;
int xsize = width;
while( xsize >= 64 )
{
// TODO alignment?
const sal_uInt64* src64 = reinterpret_cast< const sal_uInt64* >( src );
if( *src64 == 0x00 )
funcBlack( dst, 64 );
else if( *src64 == static_cast< sal_uInt64 >( -1 ))
funcWhite( dst, 64 );
else
break;
src += sizeof( sal_uInt64 );
xsize -= 64;
}
while( xsize >= 8 )
{
if( *src == 0x00 ) // => eight black pixels
funcBlack( dst, 8 );
else if( *src == 0xff ) // => eight white pixels
funcWhite( dst, 8 );
else
for( int bit = 7; bit >= 0; --bit )
func(( *src >> bit ) & 1 ? 0xff : 0, dst );
++src;
xsize -= 8;
}
for( int bit = 7; bit > 7 - xsize; --bit )
func(( *src >> bit ) & 1 ? 0xff : 0, dst );
++src;
src = srcLine + bytesPerRow;
}
}
} // 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 o3tl::enumarray<BitConvert, int> bpp = { 1, 4, 4 };
std::unique_ptr< sal_uInt8[] > data( new sal_uInt8[width * height * bpp[ 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;
}
if(bitCount == 1 && palette.GetEntryCount() == 2 && palette[ 0 ] == COL_BLACK && palette[ 1 ] == COL_WHITE)
{
switch( type )
{
case BitConvert::A8 :
writeBlackWhiteData< writeColorA8, writeBlackA8, writeWhiteA8 >
( src, data.get(), width, height, bytesPerRow );
return data;
case BitConvert::BGRA :
case BitConvert::RGBA :
// BGRA/RGBA is the same, all 3 values get the same value
writeBlackWhiteData< writeColorRGBA, writeBlackRGBA, writeWhiteRGBA >
( src, data.get(), width, height, bytesPerRow );
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::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;
}
const basegfx::SystemDependentDataHolder* SalBitmap::accessSystemDependentDataHolder() const
{
// default has no support, returns nullptr
return nullptr;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
↑ V519 The 'src' variable is assigned values twice successively. Perhaps this is a mistake. Check lines: 244, 245.