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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 <tools/color.hxx>
#include <vcl/alpha.hxx>
#include <bitmap/BitmapWriteAccess.hxx>
#include <salinst.hxx>
#include <svdata.hxx>
#include <salbmp.hxx>
#include <sal/log.hxx>
AlphaMask::AlphaMask() = default;
AlphaMask::AlphaMask( const Bitmap& rBitmap ) :
Bitmap( rBitmap )
{
if( !rBitmap.IsEmpty() )
Convert( BmpConversion::N8BitNoConversion );
}
AlphaMask::AlphaMask( const AlphaMask& ) = default;
AlphaMask::AlphaMask( AlphaMask&& ) = default;
AlphaMask::AlphaMask( const Size& rSizePixel, const sal_uInt8* pEraseTransparency )
: Bitmap(rSizePixel, vcl::PixelFormat::N8_BPP, &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.IsEmpty() )
Convert( BmpConversion::N8BitNoConversion );
return *this;
}
const Bitmap& AlphaMask::ImplGetBitmap() const
{
return *this;
}
void AlphaMask::ImplSetBitmap( const Bitmap& rBitmap )
{
SAL_WARN_IF(rBitmap.getPixelFormat() != vcl::PixelFormat::N8_BPP, "vcl.gdi", "Bitmap should be 8bpp, not " << vcl::pixelFormatBitCount(rBitmap.getPixelFormat()) << "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::BlendWith(const Bitmap& rOther)
{
std::shared_ptr<SalBitmap> xImpBmp(ImplGetSVData()->mpDefInst->CreateSalBitmap());
if (xImpBmp->Create(*ImplGetSalBitmap()) && xImpBmp->AlphaBlendWith(*rOther.ImplGetSalBitmap()))
{
ImplSetSalBitmap(xImpBmp);
return;
}
AlphaMask aOther(rOther); // to 8 bits
Bitmap::ScopedReadAccess pOtherAcc(aOther);
AlphaScopedWriteAccess pAcc(*this);
if (!(pOtherAcc && pAcc && pOtherAcc->GetBitCount() == 8 && pAcc->GetBitCount() == 8))
return;
const tools::Long nHeight = std::min(pOtherAcc->Height(), pAcc->Height());
const tools::Long nWidth = std::min(pOtherAcc->Width(), pAcc->Width());
for (tools::Long y = 0; y < nHeight; ++y)
{
Scanline scanline = pAcc->GetScanline( y );
ConstScanline otherScanline = pOtherAcc->GetScanline( y );
for (tools::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;
}
}
}
bool AlphaMask::hasAlpha() const
{
// no content, no alpha
if(IsEmpty())
return false;
ScopedReadAccess pAcc(const_cast<AlphaMask&>(*this));
const tools::Long nHeight(pAcc->Height());
const tools::Long nWidth(pAcc->Width());
// no content, no alpha
if(0 == nHeight || 0 == nWidth)
return false;
for (tools::Long y = 0; y < nHeight; ++y)
{
for (tools::Long x = 0; x < nWidth; ++x)
{
if (0 != pAcc->GetColor(y, x).GetRed())
{
return true;
}
}
}
return false;
}
void AlphaMask::ReleaseAccess( BitmapReadAccess* pAccess )
{
if( pAccess )
{
Bitmap::ReleaseAccess( pAccess );
Convert( BmpConversion::N8BitNoConversion );
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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