Adding upstream version 1:7.0.4.upstream/1%7.0.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 176 insertions, 0 deletions

diff --git a/vcl/source/gdi/alpha.cxx b/vcl/source/gdi/alpha.cxx
new file mode 100644
index 000000000..3fa43c8ea
--- /dev/null
+++ b/vcl/source/gdi/alpha.cxx
@@ -0,0 +1,176 @@
+/* -*- 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: */