2c6f28f431
Change-Id: I3cecd622aa04d842a449b4bfd6c55d0b8b96aabf Reviewed-on: https://gerrit.libreoffice.org/c/core/+/156992 Tested-by: Jenkins Reviewed-by: Thorsten Behrens <thorsten.behrens@allotropia.de>
211 lines
7.3 KiB
C++
211 lines
7.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#include <config_features.h>
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#include <tools/color.hxx>
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#include <vcl/alpha.hxx>
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#include <vcl/BitmapWriteAccess.hxx>
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#include <salinst.hxx>
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#include <svdata.hxx>
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#include <salbmp.hxx>
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#include <sal/log.hxx>
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#if HAVE_FEATURE_SKIA
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#include <vcl/skia/SkiaHelper.hxx>
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#endif
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AlphaMask::AlphaMask() = default;
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AlphaMask::AlphaMask( const Bitmap& rBitmap ) :
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maBitmap( rBitmap )
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{
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if ( !rBitmap.IsEmpty() )
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maBitmap.Convert( BmpConversion::N8BitNoConversion );
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#if HAVE_FEATURE_SKIA
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// Related tdf#156866 force snapshot of alpha mask when using Skia
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// In release builds, tdf#156629 and tdf#156630 reappear in many
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// cases because a BitmapInfoAccess is in a debug block. So, instead
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// of relying on other code to a create a BitmapInfoAccess instance,
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// create one here to force the alpha mask to handle any pending
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// scaling and make the alpha mask immutable.
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else if ( SkiaHelper::isVCLSkiaEnabled() )
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BitmapInfoAccess aInfoAccess( maBitmap );
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#endif
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assert( (IsEmpty() || maBitmap.getPixelFormat() == vcl::PixelFormat::N8_BPP) && "alpha bitmap should be 8bpp" );
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assert( (IsEmpty() || maBitmap.HasGreyPalette8Bit()) && "alpha bitmap should have greyscale palette" );
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}
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AlphaMask::AlphaMask( const AlphaMask& ) = default;
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AlphaMask::AlphaMask( AlphaMask&& ) = default;
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AlphaMask::AlphaMask( const Size& rSizePixel, const sal_uInt8* pEraseTransparency )
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: maBitmap(rSizePixel, vcl::PixelFormat::N8_BPP, &Bitmap::GetGreyPalette(256))
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{
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if( pEraseTransparency )
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{
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sal_uInt8 nAlpha = 255 - *pEraseTransparency;
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maBitmap.Erase( Color( nAlpha, nAlpha, nAlpha ) );
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}
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else
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maBitmap.Erase( COL_ALPHA_OPAQUE );
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}
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AlphaMask::~AlphaMask() = default;
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AlphaMask& AlphaMask::operator=( const Bitmap& rBitmap )
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{
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maBitmap = rBitmap;
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if( !rBitmap.IsEmpty() )
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maBitmap.Convert( BmpConversion::N8BitNoConversion );
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assert( maBitmap.getPixelFormat() == vcl::PixelFormat::N8_BPP && "alpha bitmap should be 8bpp" );
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assert( maBitmap.HasGreyPalette8Bit() && "alpha bitmap should have greyscale palette" );
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return *this;
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}
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void AlphaMask::Erase( sal_uInt8 cTransparency )
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{
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sal_uInt8 nAlpha = 255 - cTransparency;
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maBitmap.Erase( Color( nAlpha, nAlpha, nAlpha ) );
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}
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void AlphaMask::BlendWith(const AlphaMask& rOther)
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{
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std::shared_ptr<SalBitmap> xImpBmp(ImplGetSVData()->mpDefInst->CreateSalBitmap());
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if (xImpBmp->Create(*maBitmap.ImplGetSalBitmap()) && xImpBmp->AlphaBlendWith(*rOther.maBitmap.ImplGetSalBitmap()))
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{
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maBitmap.ImplSetSalBitmap(xImpBmp);
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assert( maBitmap.getPixelFormat() == vcl::PixelFormat::N8_BPP && "alpha bitmap should be 8bpp" );
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assert( maBitmap.HasGreyPalette8Bit() && "alpha bitmap should have greyscale palette" );
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return;
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}
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BitmapScopedReadAccess pOtherAcc(rOther);
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BitmapScopedWriteAccess pAcc(*this);
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assert (pOtherAcc && pAcc && pOtherAcc->GetBitCount() == 8 && pAcc->GetBitCount() == 8 && "cannot BlendWith this combination");
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if (!(pOtherAcc && pAcc && pOtherAcc->GetBitCount() == 8 && pAcc->GetBitCount() == 8))
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{
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SAL_WARN("vcl", "cannot BlendWith this combination");
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return;
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}
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const tools::Long nHeight = std::min(pOtherAcc->Height(), pAcc->Height());
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const tools::Long nWidth = std::min(pOtherAcc->Width(), pAcc->Width());
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for (tools::Long y = 0; y < nHeight; ++y)
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{
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Scanline scanline = pAcc->GetScanline( y );
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ConstScanline otherScanline = pOtherAcc->GetScanline( y );
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for (tools::Long x = 0; x < nWidth; ++x)
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{
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// Use sal_uInt16 for following multiplication
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const sal_uInt16 nGrey1 = *scanline;
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const sal_uInt16 nGrey2 = *otherScanline;
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// Awkward calculation because the original used transparency, and to replicate
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// the logic we need to translate into transparency, perform the original logic,
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// then translate back to alpha.
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// The original looked like:
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// auto tmp = nGrey1 + nGrey2 - (nGrey1 * nGrey2 / 255)
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// which, when converted to using alpha looks like
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// auto tmp = 255 - ((255 - nGrey1) + (255 - nGrey2) - (255 - nGrey1) * (255 - nGrey2) / 255);
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// which then simplifies to:
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auto tmp = nGrey1 * nGrey2 / 255;
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*scanline = static_cast<sal_uInt8>(tmp);
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++scanline;
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++otherScanline;
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}
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}
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pAcc.reset();
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assert( maBitmap.getPixelFormat() == vcl::PixelFormat::N8_BPP && "alpha bitmap should be 8bpp" );
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assert( maBitmap.HasGreyPalette8Bit() && "alpha bitmap should have greyscale palette" );
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}
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bool AlphaMask::hasAlpha() const
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{
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// no content, no alpha
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if(IsEmpty())
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return false;
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BitmapScopedReadAccess pAcc(*this);
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const tools::Long nHeight(pAcc->Height());
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const tools::Long nWidth(pAcc->Width());
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// no content, no alpha
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if(0 == nHeight || 0 == nWidth)
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return false;
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for (tools::Long y = 0; y < nHeight; ++y)
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{
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for (tools::Long x = 0; x < nWidth; ++x)
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{
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if (255 != pAcc->GetColor(y, x).GetRed())
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{
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return true;
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}
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}
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}
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return false;
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}
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bool AlphaMask::AlphaCombineOr(const AlphaMask& rMask)
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{
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BitmapScopedReadAccess pMaskAcc(rMask);
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BitmapScopedWriteAccess pAcc(*this);
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if (!pMaskAcc || !pAcc)
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return false;
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assert (pMaskAcc->GetBitCount() == 8 && pAcc->GetBitCount() == 8);
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const tools::Long nWidth = std::min(pMaskAcc->Width(), pAcc->Width());
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const tools::Long nHeight = std::min(pMaskAcc->Height(), pAcc->Height());
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for (tools::Long nY = 0; nY < nHeight; nY++)
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{
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Scanline pScanline = pAcc->GetScanline(nY);
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ConstScanline pScanlineMask = pMaskAcc->GetScanline(nY);
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for (tools::Long nX = 0; nX < nWidth; nX++)
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{
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if (*pScanlineMask != 255 || *pScanline != 255)
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*pScanline = 0;
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else
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*pScanline = 255;
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++pScanline;
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++pScanlineMask;
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}
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}
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return true;
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}
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bool AlphaMask::Invert()
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{
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if (IsEmpty())
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return false;
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bool b = maBitmap.Invert();
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assert( maBitmap.getPixelFormat() == vcl::PixelFormat::N8_BPP && "alpha bitmap should be 8bpp" );
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assert( maBitmap.HasGreyPalette8Bit() && "alpha bitmap should have greyscale palette" );
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return b;
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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