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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 <vcl/bitmapaccess.hxx>
#include <tools/color.hxx>
#include <vcl/alpha.hxx>
#include <bitmapwriteaccess.hxx>
#include <sal/log.hxx>
AlphaMask::AlphaMask() = default;
AlphaMask::AlphaMask( const Bitmap& rBitmap ) :
Bitmap( rBitmap )
{
if( !!rBitmap )
Convert( BmpConversion::N8BitNoConversion );
}
AlphaMask::AlphaMask( const AlphaMask& ) = default;
AlphaMask::AlphaMask( AlphaMask&& ) = default;
AlphaMask::AlphaMask( const Size& rSizePixel, const sal_uInt8* pEraseTransparency ) :
Bitmap( rSizePixel, 8, &Bitmap::GetGreyPalette( 256 ) )
{
if( pEraseTransparency )
Bitmap::Erase( Color( *pEraseTransparency, *pEraseTransparency, *pEraseTransparency ) );
}
AlphaMask::~AlphaMask() = default;
AlphaMask& AlphaMask::operator=( const Bitmap& rBitmap )
{
*static_cast<Bitmap*>(this) = rBitmap;
if( !!rBitmap )
Convert( BmpConversion::N8BitNoConversion );
return *this;
}
const Bitmap& AlphaMask::ImplGetBitmap() const
{
return *this;
}
void AlphaMask::ImplSetBitmap( const Bitmap& rBitmap )
{
SAL_WARN_IF( 8 != rBitmap.GetBitCount(), "vcl.gdi", "Bitmap should be 8bpp, not " << rBitmap.GetBitCount() << "bpp" );
SAL_WARN_IF( !rBitmap.HasGreyPalette8Bit(), "vcl.gdi", "Bitmap isn't greyscale" );
*static_cast<Bitmap*>(this) = rBitmap;
}
Bitmap const & AlphaMask::GetBitmap() const
{
return ImplGetBitmap();
}
void AlphaMask::Erase( sal_uInt8 cTransparency )
{
Bitmap::Erase( Color( cTransparency, cTransparency, cTransparency ) );
}
void AlphaMask::Replace( const Bitmap& rMask, sal_uInt8 cReplaceTransparency )
{
Bitmap::ScopedReadAccess pMaskAcc( const_cast<Bitmap&>(rMask) );
AlphaScopedWriteAccess pAcc(*this);
if( pMaskAcc && pAcc )
{
const BitmapColor aReplace( cReplaceTransparency );
const long nWidth = std::min( pMaskAcc->Width(), pAcc->Width() );
const long nHeight = std::min( pMaskAcc->Height(), pAcc->Height() );
const BitmapColor aMaskWhite( pMaskAcc->GetBestMatchingColor( COL_WHITE ) );
for( long nY = 0; nY < nHeight; nY++ )
{
Scanline pScanline = pAcc->GetScanline(nY);
Scanline pScanlineMask = pMaskAcc->GetScanline(nY);
for( long nX = 0; nX < nWidth; nX++ )
if( pMaskAcc->GetPixelFromData( pScanlineMask, nX ) == aMaskWhite )
pAcc->SetPixelOnData( pScanline, nX, aReplace );
}
}
}
void AlphaMask::Replace( sal_uInt8 cSearchTransparency, sal_uInt8 cReplaceTransparency )
{
AlphaScopedWriteAccess pAcc(*this);
if( pAcc && pAcc->GetBitCount() == 8 )
{
const long nWidth = pAcc->Width(), nHeight = pAcc->Height();
if( pAcc->GetScanlineFormat() == ScanlineFormat::N8BitPal )
{
for( long nY = 0; nY < nHeight; nY++ )
{
Scanline pScan = pAcc->GetScanline( nY );
for( long nX = 0; nX < nWidth; nX++, pScan++ )
{
if( *pScan == cSearchTransparency )
*pScan = cReplaceTransparency;
}
}
}
else
{
BitmapColor aReplace( cReplaceTransparency );
for( long nY = 0; nY < nHeight; nY++ )
{
Scanline pScanline = pAcc->GetScanline(nY);
for( long nX = 0; nX < nWidth; nX++ )
{
if( pAcc->GetIndexFromData( pScanline, nX ) == cSearchTransparency )
pAcc->SetPixelOnData( pScanline, nX, aReplace );
}
}
}
}
}
void AlphaMask::BlendWith(const Bitmap& rOther)
{
AlphaMask aOther(rOther); // to 8 bits
Bitmap::ScopedReadAccess pOtherAcc(aOther);
AlphaScopedWriteAccess pAcc(*this);
if (pOtherAcc && pAcc && pOtherAcc->GetBitCount() == 8 && pAcc->GetBitCount() == 8)
{
const long nHeight = std::min(pOtherAcc->Height(), pAcc->Height());
const long nWidth = std::min(pOtherAcc->Width(), pAcc->Width());
for (long y = 0; y < nHeight; ++y)
{
Scanline scanline = pAcc->GetScanline( y );
ConstScanline otherScanline = pOtherAcc->GetScanline( y );
for (long x = 0; x < nWidth; ++x)
{
// Use sal_uInt16 for following multiplication
const sal_uInt16 nGrey1 = *scanline;
const sal_uInt16 nGrey2 = *otherScanline;
*scanline = static_cast<sal_uInt8>(nGrey1 + nGrey2 - nGrey1 * nGrey2 / 255);
++scanline;
++otherScanline;
}
}
}
}
void AlphaMask::ReleaseAccess( BitmapReadAccess* pAccess )
{
if( pAccess )
{
Bitmap::ReleaseAccess( pAccess );
Convert( BmpConversion::N8BitNoConversion );
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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