vcl/source/gdi/alpha.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <vcl/bitmapaccess.hxx>
  21 #include <tools/color.hxx>
  22 #include <vcl/alpha.hxx>
  23
  24 AlphaMask::AlphaMask()
  25 {
  26 }
  27
  28 AlphaMask::AlphaMask( const Bitmap& rBitmap ) :
  29     Bitmap( rBitmap )
  30 {
  31     if( !!rBitmap )
  32         Convert( BmpConversion::N8BitGreys );
  33 }
  34
  35 AlphaMask::AlphaMask( const AlphaMask& rAlphaMask ) :
  36     Bitmap( rAlphaMask )
  37 {
  38 }
  39
  40 AlphaMask::AlphaMask( AlphaMask&& rAlphaMask ) :
  41     Bitmap( std::move(rAlphaMask) )
  42 {
  43 }
  44
  45 AlphaMask::AlphaMask( const Size& rSizePixel, sal_uInt8* pEraseTransparency ) :
  46     Bitmap( rSizePixel, 8, &Bitmap::GetGreyPalette( 256 ) )
  47 {
  48     if( pEraseTransparency )
  49         Bitmap::Erase( Color( *pEraseTransparency, *pEraseTransparency, *pEraseTransparency ) );
  50 }
  51
  52 AlphaMask::~AlphaMask()
  53 {
  54 }
  55
  56 AlphaMask& AlphaMask::operator=( const Bitmap& rBitmap )
  57 {
  58     *static_cast<Bitmap*>(this) = rBitmap;
  59
  60     if( !!rBitmap )
  61         Convert( BmpConversion::N8BitGreys );
  62
  63     return *this;
  64 }
  65
  66 const Bitmap& AlphaMask::ImplGetBitmap() const
  67 {
  68     return( (const Bitmap&) *this );
  69 }
  70
  71 void AlphaMask::ImplSetBitmap( const Bitmap& rBitmap )
  72 {
  73     SAL_WARN_IF( 8 != rBitmap.GetBitCount(), "vcl.gdi", "Bitmap should be 8bpp, not " << rBitmap.GetBitCount() << "bpp" );
  74     SAL_WARN_IF( !rBitmap.HasGreyPalette(), "vcl.gdi", "Bitmap isn't greyscale" );
  75     *static_cast<Bitmap*>(this) = rBitmap;
  76 }
  77
  78 Bitmap AlphaMask::GetBitmap() const
  79 {
  80     return ImplGetBitmap();
  81 }
  82
  83 bool AlphaMask::Erase( sal_uInt8 cTransparency )
  84 {
  85     return Bitmap::Erase( Color( cTransparency, cTransparency, cTransparency ) );
  86 }
  87
  88 bool AlphaMask::Replace( const Bitmap& rMask, sal_uInt8 cReplaceTransparency )
  89 {
  90     Bitmap::ScopedReadAccess pMaskAcc( const_cast<Bitmap&>(rMask) );
  91     AlphaMask::ScopedWriteAccess pAcc(*this);
  92     bool                bRet = false;
  93
  94     if( pMaskAcc && pAcc )
  95     {
  96         const BitmapColor   aReplace( cReplaceTransparency );
  97         const long          nWidth = std::min( pMaskAcc->Width(), pAcc->Width() );
  98         const long          nHeight = std::min( pMaskAcc->Height(), pAcc->Height() );
  99         const BitmapColor   aMaskWhite( pMaskAcc->GetBestMatchingColor( Color( COL_WHITE ) ) );
 100
 101         for( long nY = 0L; nY < nHeight; nY++ )
 102             for( long nX = 0L; nX < nWidth; nX++ )
 103                 if( pMaskAcc->GetPixel( nY, nX ) == aMaskWhite )
 104                     pAcc->SetPixel( nY, nX, aReplace );
 105     }
 106     return bRet;
 107 }
 108
 109 bool AlphaMask::Replace( sal_uInt8 cSearchTransparency, sal_uInt8 cReplaceTransparency )
 110 {
 111     AlphaMask::ScopedWriteAccess pAcc(*this);
 112     bool                bRet = false;
 113
 114     if( pAcc && pAcc->GetBitCount() == 8 )
 115     {
 116         const long nWidth = pAcc->Width(), nHeight = pAcc->Height();
 117
 118         if( pAcc->GetScanlineFormat() == ScanlineFormat::N8BitPal )
 119         {
 120             for( long nY = 0L; nY < nHeight; nY++ )
 121             {
 122                 Scanline pScan = pAcc->GetScanline( nY );
 123
 124                 for( long nX = 0L; nX < nWidth; nX++, pScan++ )
 125                 {
 126                     if( *pScan == cSearchTransparency )
 127                         *pScan = cReplaceTransparency;
 128                 }
 129             }
 130         }
 131         else
 132         {
 133             BitmapColor aReplace( cReplaceTransparency );
 134
 135             for( long nY = 0L; nY < nHeight; nY++ )
 136             {
 137                 for( long nX = 0L; nX < nWidth; nX++ )
 138                 {
 139                     if( pAcc->GetPixel( nY, nX ).GetIndex() == cSearchTransparency )
 140                         pAcc->SetPixel( nY, nX, aReplace );
 141                 }
 142             }
 143         }
 144
 145         bRet = true;
 146     }
 147
 148     return bRet;
 149 }
 150
 151 void AlphaMask::ReleaseAccess( BitmapReadAccess* pAccess )
 152 {
 153     if( pAccess )
 154     {
 155         Bitmap::ReleaseAccess( pAccess );
 156         Convert( BmpConversion::N8BitGreys );
 157     }
 158 }
 159
 160 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */