[Libreoffice-commits] core.git: Branch 'libreoffice-5-0' - filter/source include/vcl svtools/source sw/qa vcl/inc vcl/Library_vcl.mk vcl/opengl vcl/Package_opengl.mk vcl/source vcl/unx

Marco Cecchetti marco.cecchetti at collabora.com
Wed Sep 2 00:22:09 PDT 2015


 filter/source/flash/swfexporter.cxx          |   14 +-
 filter/source/flash/swfexporter.hxx          |    7 -
 filter/source/flash/swfwriter.hxx            |    3 
 filter/source/flash/swfwriter1.cxx           |    2 
 filter/source/svg/svgexport.cxx              |   10 -
 filter/source/svg/svgwriter.cxx              |    6 
 filter/source/svg/svgwriter.hxx              |    2 
 include/vcl/alpha.hxx                        |    2 
 include/vcl/animate.hxx                      |    4 
 include/vcl/bitmap.hxx                       |    3 
 include/vcl/bitmapex.hxx                     |    2 
 include/vcl/checksum.hxx                     |   92 +++++++++++++
 include/vcl/gdimtf.hxx                       |    2 
 include/vcl/graph.hxx                        |    4 
 svtools/source/graphic/grfcache.cxx          |    8 -
 sw/qa/extras/ooxmlimport/ooxmlimport.cxx     |    2 
 vcl/Library_vcl.mk                           |    1 
 vcl/Package_opengl.mk                        |    1 
 vcl/inc/impbmp.hxx                           |    7 -
 vcl/inc/impgraph.hxx                         |    2 
 vcl/inc/opengl/program.hxx                   |    2 
 vcl/inc/opengl/salbmp.hxx                    |    3 
 vcl/inc/salbmp.hxx                           |   52 +++++++
 vcl/opengl/areaHashCRC64TFragmentShader.glsl |   87 +++++++++++++
 vcl/opengl/program.cxx                       |    2 
 vcl/opengl/salbmp.cxx                        |  101 +++++++++++++++
 vcl/source/bitmap/checksum.cxx               |  154 +++++++++++++++++++++++
 vcl/source/gdi/animate.cxx                   |   35 ++---
 vcl/source/gdi/bitmap.cxx                    |   54 --------
 vcl/source/gdi/bitmapex.cxx                  |   13 +
 vcl/source/gdi/gdimtf.cxx                    |  179 +++++++++++++--------------
 vcl/source/gdi/graph.cxx                     |    2 
 vcl/source/gdi/impbmp.cxx                    |   26 +++
 vcl/source/gdi/impgraph.cxx                  |    4 
 vcl/source/gdi/pdfwriter_impl.cxx            |    2 
 vcl/source/gdi/pdfwriter_impl.hxx            |    4 
 vcl/unx/gtk/app/gtkinst.cxx                  |    2 
 37 files changed, 681 insertions(+), 215 deletions(-)

New commits:
commit f85ed94f46e9f1b15cb42d66380e666ce7ee71ee
Author: Marco Cecchetti <marco.cecchetti at collabora.com>
Date:   Wed Aug 26 13:50:57 2015 +0200

    tdf#93532 - Switching to 64-bit checksum
    
    Added a C++ and a GLSL implementation of a 64-bit CRC algorithm.
    
    Changed hardcoded checksum value in ooxmlimport unit test (testN777345).
    
    Change-Id: I16bb985a14866775efda49e21fe033ff64645896
    Reviewed-on: https://gerrit.libreoffice.org/18254
    Tested-by: Jenkins <ci at libreoffice.org>
    Reviewed-by: Miklos Vajna <vmiklos at collabora.co.uk>

diff --git a/filter/source/flash/swfexporter.cxx b/filter/source/flash/swfexporter.cxx
index f7e5250..b9bd58d 100644
--- a/filter/source/flash/swfexporter.cxx
+++ b/filter/source/flash/swfexporter.cxx
@@ -431,8 +431,8 @@ sal_uInt16 FlashExporter::exportDrawPageBackground(sal_uInt16 nPage, Reference<
     getMetaFile( xCompMaster, aMtfMaster, true );
     getMetaFile( xComponent, aMtfPrivate, true );
 
-    sal_uInt32 masterchecksum = aMtfMaster.GetChecksum();
-    sal_uInt32 privatechecksum = aMtfPrivate.GetChecksum();
+    BitmapChecksum masterchecksum = aMtfMaster.GetChecksum();
+    BitmapChecksum privatechecksum = aMtfPrivate.GetChecksum();
 
     // AS: If the slide has its own background
     if (privatechecksum)
@@ -484,7 +484,7 @@ sal_uInt16 FlashExporter::exportMasterPageObjects(sal_uInt16 nPage, Reference< X
 {
     Reference< XShapes > xShapes( xMasterPage, UNO_QUERY );
 
-    sal_uInt32 shapesum = ActionSummer(xShapes);
+    BitmapChecksum shapesum = ActionSummer(xShapes);
 
     ChecksumCache::iterator it = gObjectCache.find(shapesum);
 
@@ -631,7 +631,7 @@ void FlashExporter::exportShape( const Reference< XShape >& xShape, bool bMaster
                 getMetaFile( xComponent, aMtf, false, true );
 
             sal_uInt16 nID;
-            sal_uInt32 checksum = aMtf.GetChecksum();
+            BitmapChecksum checksum = aMtf.GetChecksum();
 
             ChecksumCache::iterator it = gMetafileCache.find(checksum);
 
@@ -748,7 +748,7 @@ bool FlashExporter::getMetaFile( Reference< XComponent >&xComponent, GDIMetaFile
     return rMtf.GetActionSize() != 0;
 }
 
-sal_uInt32 FlashExporter::ActionSummer(Reference< XShape >& xShape)
+BitmapChecksum FlashExporter::ActionSummer(Reference< XShape >& xShape)
 {
     Reference< XShapes > xShapes( xShape, UNO_QUERY );
 
@@ -767,10 +767,10 @@ sal_uInt32 FlashExporter::ActionSummer(Reference< XShape >& xShape)
     }
 }
 
-sal_uInt32 FlashExporter::ActionSummer(Reference< XShapes >& xShapes)
+BitmapChecksum FlashExporter::ActionSummer(Reference< XShapes >& xShapes)
 {
     sal_uInt32 nShapeCount = xShapes->getCount();
-    sal_uInt32 shapecount = 0;
+    BitmapChecksum shapecount = 0;
 
     Reference< XShape > xShape2;
 
diff --git a/filter/source/flash/swfexporter.hxx b/filter/source/flash/swfexporter.hxx
index 2e78abd..bfad3ee 100644
--- a/filter/source/flash/swfexporter.hxx
+++ b/filter/source/flash/swfexporter.hxx
@@ -29,11 +29,12 @@
 #include <com/sun/star/presentation/ClickAction.hpp>
 #include <com/sun/star/presentation/FadeEffect.hpp>
 #include <osl/file.hxx>
+#include <vcl/checksum.hxx>
 
 #include <vector>
 #include <map>
 
-typedef ::std::map<sal_uInt32, sal_uInt16> ChecksumCache;
+typedef ::std::map<BitmapChecksum, sal_uInt16> ChecksumCache;
 
 class GDIMetaFile;
 
@@ -185,8 +186,8 @@ private:
     void exportShapes( const ::com::sun::star::uno::Reference< ::com::sun::star::drawing::XShapes >& xShapes, bool bStream, bool bMaster );
     void exportShape( const ::com::sun::star::uno::Reference< ::com::sun::star::drawing::XShape >& xShape, bool bMaster);
 
-    sal_uInt32 ActionSummer(::com::sun::star::uno::Reference< ::com::sun::star::drawing::XShape >& xShape);
-    sal_uInt32 ActionSummer(::com::sun::star::uno::Reference< ::com::sun::star::drawing::XShapes >& xShapes);
+    BitmapChecksum ActionSummer(::com::sun::star::uno::Reference< ::com::sun::star::drawing::XShape >& xShape);
+    BitmapChecksum ActionSummer(::com::sun::star::uno::Reference< ::com::sun::star::drawing::XShapes >& xShapes);
 
     void animateShape( ShapeAnimationInfo& rAnimInfo );
     void animatePage( PageInfo* pPageInfo );
diff --git a/filter/source/flash/swfwriter.hxx b/filter/source/flash/swfwriter.hxx
index be08fb2..215777b 100644
--- a/filter/source/flash/swfwriter.hxx
+++ b/filter/source/flash/swfwriter.hxx
@@ -23,6 +23,7 @@
 #include <com/sun/star/uno/Sequence.hxx>
 #include <com/sun/star/io/XOutputStream.hpp>
 #include <com/sun/star/i18n/XBreakIterator.hpp>
+#include <vcl/checksum.hxx>
 #include <vcl/font.hxx>
 #include <vcl/gradient.hxx>
 #include <vcl/vclptr.hxx>
@@ -106,7 +107,7 @@ sal_uInt32 getFixed( double fValue );
 
 
 
-typedef ::std::map<sal_uInt32, sal_uInt16> ChecksumCache;
+typedef ::std::map<BitmapChecksum, sal_uInt16> ChecksumCache;
 
 /** unsigned int 16 compare operation for stl */
 struct ltuint16
diff --git a/filter/source/flash/swfwriter1.cxx b/filter/source/flash/swfwriter1.cxx
index 1ffdd48..e901529 100644
--- a/filter/source/flash/swfwriter1.cxx
+++ b/filter/source/flash/swfwriter1.cxx
@@ -787,7 +787,7 @@ void getBitmapData( const BitmapEx& aBmpEx, sal_uInt8*& tgadata, sal_uInt8*& tga
 
 sal_uInt16 Writer::defineBitmap( const BitmapEx &bmpSource, sal_Int32 nJPEGQualityLevel )
 {
-    sal_uLong bmpChecksum = bmpSource.GetChecksum();
+    BitmapChecksum bmpChecksum = bmpSource.GetChecksum();
 
     ChecksumCache::iterator it = mBitmapCache.find(bmpChecksum);
 
diff --git a/filter/source/svg/svgexport.cxx b/filter/source/svg/svgexport.cxx
index a697793..794c713 100644
--- a/filter/source/svg/svgexport.cxx
+++ b/filter/source/svg/svgexport.cxx
@@ -422,9 +422,9 @@ bool ObjectRepresentation::operator==( const ObjectRepresentation& rPresentation
 
 
 
-sal_uLong GetBitmapChecksum( const MetaAction* pAction )
+BitmapChecksum GetBitmapChecksum( const MetaAction* pAction )
 {
-    sal_uLong nChecksum = 0;
+    BitmapChecksum nChecksum = 0;
     const MetaActionType nType = pAction->GetType();
 
     switch( nType )
@@ -506,8 +506,8 @@ bool EqualityBitmap::operator()( const ObjectRepresentation& rObjRep1,
     const GDIMetaFile& aMtf2 = rObjRep2.GetRepresentation();
     if( aMtf1.GetActionSize() == 1 && aMtf2.GetActionSize() == 1 )
     {
-        sal_uLong nChecksum1 = GetBitmapChecksum( aMtf1.GetAction( 0 ) );
-        sal_uLong nChecksum2 = GetBitmapChecksum( aMtf2.GetAction( 0 ) );
+        BitmapChecksum nChecksum1 = GetBitmapChecksum( aMtf1.GetAction( 0 ) );
+        BitmapChecksum nChecksum2 = GetBitmapChecksum( aMtf2.GetAction( 0 ) );
         return ( nChecksum1 == nChecksum2 );
     }
     else
@@ -1301,7 +1301,7 @@ bool SVGFilter::implExportTextEmbeddedBitmaps()
             MetaAction* pAction = aMtf.GetAction( 0 );
             if( pAction )
             {
-                sal_uLong nId = GetBitmapChecksum( pAction );
+                BitmapChecksum nId = GetBitmapChecksum( pAction );
                 sId = "bitmap(" + OUString::number( nId ) + ")";
                 mpSVGExport->AddAttribute( XML_NAMESPACE_NONE, "id", sId );
 
diff --git a/filter/source/svg/svgwriter.cxx b/filter/source/svg/svgwriter.cxx
index 56c5f76..98e8484 100644
--- a/filter/source/svg/svgwriter.cxx
+++ b/filter/source/svg/svgwriter.cxx
@@ -1361,7 +1361,7 @@ void SVGTextWriter::writeBitmapPlaceholder( const MetaBitmapActionType* pAction
     }
 
     // bitmap placeholder element
-    sal_uLong nId = SVGActionWriter::GetChecksum( pAction );
+    BitmapChecksum nId = SVGActionWriter::GetChecksum( pAction );
     OUString sId = "bitmap-placeholder("  + msShapeId + "." +
                    OUString::number( nId ) + ")";
 
@@ -1383,7 +1383,7 @@ void SVGTextWriter::implWriteEmbeddedBitmaps()
         const GDIMetaFile& rMtf = *mpTextEmbeddedBitmapMtf;
 
         OUString sId, sRefId;
-        sal_uLong nId, nChecksum = 0;
+        BitmapChecksum nId, nChecksum = 0;
         Point aPt;
         Size  aSz;
         sal_uLong nCount = rMtf.GetActionSize();
@@ -1781,7 +1781,7 @@ OUString SVGActionWriter::GetPathString( const tools::PolyPolygon& rPolyPoly, bo
      return aPathData;
 }
 
-sal_uLong SVGActionWriter::GetChecksum( const MetaAction* pAction )
+BitmapChecksum SVGActionWriter::GetChecksum( const MetaAction* pAction )
 {
     GDIMetaFile aMtf;
     MetaAction* pA = const_cast<MetaAction*>(pAction);
diff --git a/filter/source/svg/svgwriter.hxx b/filter/source/svg/svgwriter.hxx
index 42efe63..c99e4cb 100644
--- a/filter/source/svg/svgwriter.hxx
+++ b/filter/source/svg/svgwriter.hxx
@@ -371,7 +371,7 @@ private:
 public:
 
     static OUString  GetPathString( const tools::PolyPolygon& rPolyPoly, bool bLine );
-    static sal_uLong        GetChecksum( const MetaAction* pAction );
+    static BitmapChecksum GetChecksum( const MetaAction* pAction );
 
 public:
 
diff --git a/include/vcl/alpha.hxx b/include/vcl/alpha.hxx
index ec89be4..89b6996 100644
--- a/include/vcl/alpha.hxx
+++ b/include/vcl/alpha.hxx
@@ -52,7 +52,7 @@ public:
     Size        GetSizePixel() const { return Bitmap::GetSizePixel(); }
     sal_uLong   GetSizeBytes() const { return Bitmap::GetSizeBytes(); }
 
-    sal_uLong   GetChecksum() const { return Bitmap::GetChecksum(); }
+    BitmapChecksum   GetChecksum() const { return Bitmap::GetChecksum(); }
 
     Bitmap      GetBitmap() const;
 
diff --git a/include/vcl/animate.hxx b/include/vcl/animate.hxx
index 1f2a6b8..db62836 100644
--- a/include/vcl/animate.hxx
+++ b/include/vcl/animate.hxx
@@ -97,7 +97,7 @@ struct VCL_DLLPUBLIC AnimationBitmap
                                     rAnimBmp.aBmpEx.IsEqual( aBmpEx ) );
                         }
 
-    sal_uLong       GetChecksum() const;
+    BitmapChecksum  GetChecksum() const;
 };
 
 struct AInfo
@@ -173,7 +173,7 @@ public:
     void            Replace( const AnimationBitmap& rNewAnimationBmp, sal_uInt16 nAnimation );
 
     sal_uLong       GetSizeBytes() const;
-    sal_uLong       GetChecksum() const;
+    BitmapChecksum  GetChecksum() const;
 
 public:
 
diff --git a/include/vcl/bitmap.hxx b/include/vcl/bitmap.hxx
index a9f2146..e9800a0 100644
--- a/include/vcl/bitmap.hxx
+++ b/include/vcl/bitmap.hxx
@@ -24,6 +24,7 @@
 #include <tools/color.hxx>
 #include <tools/link.hxx>
 #include <tools/solar.h>
+#include <vcl/checksum.hxx>
 #include <vcl/dllapi.h>
 #include <vcl/mapmod.hxx>
 #include <vcl/region.hxx>
@@ -386,7 +387,7 @@ public:
     */
     bool                    GetSystemData( BitmapSystemData& rData ) const;
 
-    sal_uLong               GetChecksum() const;
+    BitmapChecksum          GetChecksum() const;
 
     Bitmap                  CreateDisplayBitmap( OutputDevice* pDisplay );
     Bitmap                  GetColorTransformedBitmap() const;
diff --git a/include/vcl/bitmapex.hxx b/include/vcl/bitmapex.hxx
index 096e2a0..d609d89 100644
--- a/include/vcl/bitmapex.hxx
+++ b/include/vcl/bitmapex.hxx
@@ -96,7 +96,7 @@ public:
 
     sal_uInt16          GetBitCount() const { return aBitmap.GetBitCount(); }
     sal_uLong           GetSizeBytes() const;
-    sal_uLong           GetChecksum() const;
+    BitmapChecksum      GetChecksum() const;
 
 public:
 
diff --git a/include/vcl/checksum.hxx b/include/vcl/checksum.hxx
new file mode 100644
index 0000000..7e1076f
--- /dev/null
+++ b/include/vcl/checksum.hxx
@@ -0,0 +1,92 @@
+/* -*- 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 .
+ */
+
+
+#ifndef INCLUDED_VCL_INC_CHECKSUM_HXX
+#define INCLUDED_VCL_INC_CHECKSUM_HXX
+
+#include <sal/config.h>
+#include <sal/types.h>
+#include <tools/solar.h>
+#include <vcl/dllapi.h>
+
+#include <boost/preprocessor/arithmetic/inc.hpp>
+#include <boost/preprocessor/arithmetic/mul.hpp>
+#include <boost/preprocessor/repetition/repeat_from_to.hpp>
+
+#define BITMAP_CHECKSUM_SIZE 8
+#define BITMAP_CHECKSUM_BITS BOOST_PP_MUL(BITMAP_CHECKSUM_SIZE, 8)
+
+typedef sal_uInt64   BitmapChecksum;
+typedef sal_uInt8   BitmapChecksumOctetArray[BITMAP_CHECKSUM_SIZE];
+
+#define BITMAP_CHECKSUM_SET_OCTET(z, i, unused) \
+p[i] = (sal_uInt8)(n >> BOOST_PP_MUL(8, i));
+
+
+inline void BCToBCOA( BitmapChecksum n , BitmapChecksumOctetArray p )
+{
+    BOOST_PP_REPEAT(BITMAP_CHECKSUM_SIZE , BITMAP_CHECKSUM_SET_OCTET, unused)
+}
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*========================================================================
+ *
+ * vcl_crc64 interface.
+ *
+ *======================================================================*/
+/** Evaluate CRC64 over given data.
+
+    This function evaluates the CRC polynomial 0xEDB88320.
+
+    @param  Crc    [in] CRC64 over previous data or zero.
+    @param  Data   [in] data buffer.
+    @param  DatLen [in] data buffer length.
+    @return new CRC64 value.
+ */
+VCL_DLLPUBLIC sal_uInt64 SAL_CALL vcl_crc64 (
+    sal_uInt64  Crc,
+    const void *Data, sal_uInt32 DatLen
+)   SAL_THROW_EXTERN_C();
+
+
+
+VCL_DLLPUBLIC const sal_uInt64* vcl_get_crc64_table();
+
+
+#ifdef __cplusplus
+}
+#endif
+
+inline BitmapChecksum vcl_get_checksum (
+    BitmapChecksum  Checksum,
+    const void *Data,
+    sal_uInt32 DatLen
+)
+{
+    return (BitmapChecksum)(vcl_crc64( Checksum, Data, DatLen ));
+}
+
+
+#endif // INCLUDED_VCL_INC_CHECKSUM_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/vcl/gdimtf.hxx b/include/vcl/gdimtf.hxx
index 8baa116..28075dc 100644
--- a/include/vcl/gdimtf.hxx
+++ b/include/vcl/gdimtf.hxx
@@ -198,7 +198,7 @@ public:
     void            SetHookHdl( const Link<>& rLink ) { aHookHdlLink = rLink; }
     const Link<>&   GetHookHdl() const { return aHookHdlLink; }
 
-    sal_uLong       GetChecksum() const;
+    BitmapChecksum  GetChecksum() const;
     sal_uLong       GetSizeBytes() const;
 
     // Methods for reading and writing the new formats;
diff --git a/include/vcl/graph.hxx b/include/vcl/graph.hxx
index 778c6719..929daf8 100644
--- a/include/vcl/graph.hxx
+++ b/include/vcl/graph.hxx
@@ -161,9 +161,9 @@ public:
     void                SetAnimationNotifyHdl( const Link<>& rLink );
     Link<>              GetAnimationNotifyHdl() const;
 
-    sal_uLong               GetAnimationLoopCount() const;
+    sal_uLong           GetAnimationLoopCount() const;
 
-    sal_uLong               GetChecksum() const;
+    BitmapChecksum      GetChecksum() const;
 
 public:
 
diff --git a/svtools/source/graphic/grfcache.cxx b/svtools/source/graphic/grfcache.cxx
index 05c1f98..28e4ab0 100644
--- a/svtools/source/graphic/grfcache.cxx
+++ b/svtools/source/graphic/grfcache.cxx
@@ -43,7 +43,7 @@ private:
     sal_uInt32  mnID1;
     sal_uInt32  mnID2;
     sal_uInt32  mnID3;
-    sal_uInt32  mnID4;
+    BitmapChecksum  mnID4;
 
 public:
 
@@ -79,7 +79,7 @@ GraphicID::GraphicID( const GraphicObject& rObj )
                 mnID1 |= rSvgDataPtr->getSvgDataArrayLength();
                 mnID2 = basegfx::fround(rRange.getWidth());
                 mnID3 = basegfx::fround(rRange.getHeight());
-                mnID4 = rtl_crc32(0, rSvgDataPtr->getSvgDataArray().get(), rSvgDataPtr->getSvgDataArrayLength());
+                mnID4 = vcl_get_checksum(0, rSvgDataPtr->getSvgDataArray().get(), rSvgDataPtr->getSvgDataArrayLength());
             }
             else if( rGraphic.IsAnimated() )
             {
@@ -123,7 +123,7 @@ OString GraphicID::GetIDString() const
 {
     OStringBuffer aHexStr;
     sal_Int32 nShift, nIndex = 0;
-    aHexStr.setLength(32);
+    aHexStr.setLength(24 + (2 * BITMAP_CHECKSUM_SIZE));
 
     for( nShift = 28; nShift >= 0; nShift -= 4 )
         aHexStr[nIndex++] = aHexData[ ( mnID1 >> (sal_uInt32) nShift ) & 0xf ];
@@ -134,7 +134,7 @@ OString GraphicID::GetIDString() const
     for( nShift = 28; nShift >= 0; nShift -= 4 )
         aHexStr[nIndex++] = aHexData[ ( mnID3 >> (sal_uInt32) nShift ) & 0xf ];
 
-    for( nShift = 28; nShift >= 0; nShift -= 4 )
+    for( nShift = BITMAP_CHECKSUM_BITS - 4; nShift >= 0; nShift -= 4 )
         aHexStr[nIndex++] = aHexData[ ( mnID4 >> (sal_uInt32) nShift ) & 0xf ];
 
     return aHexStr.makeStringAndClear();
diff --git a/sw/qa/extras/ooxmlimport/ooxmlimport.cxx b/sw/qa/extras/ooxmlimport/ooxmlimport.cxx
index 291d982..98ce91a 100644
--- a/sw/qa/extras/ooxmlimport/ooxmlimport.cxx
+++ b/sw/qa/extras/ooxmlimport/ooxmlimport.cxx
@@ -750,7 +750,7 @@ DECLARE_OOXMLIMPORT_TEST(testN777345, "n777345.docx")
     Graphic aGraphic(xGraphic);
     // If this changes later, feel free to update it, but make sure it's not
     // the checksum of a white/transparent placeholder rectangle.
-    CPPUNIT_ASSERT_EQUAL(sal_uLong(2529763117U), aGraphic.GetChecksum());
+    CPPUNIT_ASSERT_EQUAL(BitmapChecksum(3652741777587093783), aGraphic.GetChecksum());
 #endif
 }
 
diff --git a/vcl/Library_vcl.mk b/vcl/Library_vcl.mk
index 56231d0..c6b33e6 100644
--- a/vcl/Library_vcl.mk
+++ b/vcl/Library_vcl.mk
@@ -318,6 +318,7 @@ $(eval $(call gb_Library_add_exception_objects,vcl,\
     vcl/source/bitmap/bitmapscalesuper \
     vcl/source/bitmap/BitmapSymmetryCheck \
     vcl/source/bitmap/BitmapFilterStackBlur \
+    vcl/source/bitmap/checksum \
     vcl/source/helper/canvasbitmap \
     vcl/source/helper/canvastools \
     vcl/source/helper/evntpost \
diff --git a/vcl/Package_opengl.mk b/vcl/Package_opengl.mk
index 2628dcd..df3520c 100644
--- a/vcl/Package_opengl.mk
+++ b/vcl/Package_opengl.mk
@@ -10,6 +10,7 @@
 $(eval $(call gb_Package_Package,vcl_opengl_shader,$(SRCDIR)/vcl/opengl))
 
 $(eval $(call gb_Package_add_files,vcl_opengl_shader,$(LIBO_ETC_FOLDER)/opengl,\
+    areaHashCRC64TFragmentShader.glsl \
 	areaScaleFastFragmentShader.glsl \
 	areaScaleFragmentShader.glsl \
 	blendedTextureFragmentShader.glsl \
diff --git a/vcl/inc/impbmp.hxx b/vcl/inc/impbmp.hxx
index 0dc9ec8..cc09181 100644
--- a/vcl/inc/impbmp.hxx
+++ b/vcl/inc/impbmp.hxx
@@ -34,7 +34,6 @@ class ImpBitmap
 {
 private:
     sal_uLong           mnRefCount;
-    sal_uLong           mnChecksum;
     SalBitmap*          mpSalBitmap;
 
 public:
@@ -45,6 +44,8 @@ public:
                         ImpBitmap(SalBitmap* pBitmap);
                         ~ImpBitmap();
 
+    bool                ImplIsEqual(const ImpBitmap& rBmp) const;
+
     SalBitmap*          ImplGetSalBitmap() const { return mpSalBitmap; }
 
     bool            ImplCreate( const Size& rSize, sal_uInt16 nBitCount, const BitmapPalette& rPal );
@@ -62,8 +63,8 @@ public:
     void                ImplIncRefCount() { mnRefCount++; }
     void                ImplDecRefCount() { mnRefCount--; }
 
-    inline void         ImplSetChecksum( sal_uLong nChecksum ) { mnChecksum = nChecksum; }
-    inline sal_uLong    ImplGetChecksum() const { return mnChecksum; }
+    BitmapChecksum      ImplGetChecksum() const;
+    void                ImplInvalidateChecksum();
 
     bool                ImplScale( const double& rScaleX, const double& rScaleY, BmpScaleFlag nScaleFlag );
     bool                ImplReplace( const Color& rSearchColor, const Color& rReplaceColor, sal_uLong nTol );
diff --git a/vcl/inc/impgraph.hxx b/vcl/inc/impgraph.hxx
index 6baed71..51937b5 100644
--- a/vcl/inc/impgraph.hxx
+++ b/vcl/inc/impgraph.hxx
@@ -145,7 +145,7 @@ private:
     GfxLink             ImplGetLink();
     bool                ImplIsLink() const;
 
-    sal_uLong               ImplGetChecksum() const;
+    BitmapChecksum      ImplGetChecksum() const;
 
     bool                ImplExportNative( SvStream& rOStm ) const;
 
diff --git a/vcl/inc/opengl/program.hxx b/vcl/inc/opengl/program.hxx
index 8289a56..7bdd43d 100644
--- a/vcl/inc/opengl/program.hxx
+++ b/vcl/inc/opengl/program.hxx
@@ -76,7 +76,7 @@ public:
 
     void ApplyMatrix(float fWidth, float fHeight, float fPixelOffset = 0.0f);
 
-    bool DrawTexture( OpenGLTexture& rTexture );
+    bool DrawTexture( const OpenGLTexture& rTexture );
 
 protected:
     void SetVertexAttrib( GLuint& rAttrib, const OString& rName, const GLvoid* pData );
diff --git a/vcl/inc/opengl/salbmp.hxx b/vcl/inc/opengl/salbmp.hxx
index 15ff571..53d8957 100644
--- a/vcl/inc/opengl/salbmp.hxx
+++ b/vcl/inc/opengl/salbmp.hxx
@@ -53,6 +53,9 @@ private:
     std::deque< OpenGLSalBitmapOp* >    maPendingOps;
 
     void makeCurrent();
+    virtual void updateChecksum() const;
+
+    bool calcChecksumGL(OpenGLTexture& rInputTexture, ChecksumType& rChecksum) const;
 
 public:
     OpenGLSalBitmap();
diff --git a/vcl/inc/salbmp.hxx b/vcl/inc/salbmp.hxx
index f89f417..bbd0ee1 100644
--- a/vcl/inc/salbmp.hxx
+++ b/vcl/inc/salbmp.hxx
@@ -23,6 +23,7 @@
 #include <tools/gen.hxx>
 #include <tools/solar.h>
 #include <vcl/dllapi.h>
+#include <vcl/checksum.hxx>
 #include <vcl/salbtype.hxx>
 
 #include <com/sun/star/rendering/XBitmapCanvas.hpp>
@@ -37,8 +38,11 @@ enum class BmpScaleFlag;
 class VCL_PLUGIN_PUBLIC SalBitmap
 {
 public:
-    SalBitmap() {}
-    virtual ~SalBitmap();
+
+    typedef BitmapChecksum  ChecksumType;
+
+                            SalBitmap() : mbChecksumValid(false) {}
+    virtual                 ~SalBitmap();
 
     virtual bool            Create( const Size& rSize,
                                     sal_uInt16 nBitCount,
@@ -63,6 +67,50 @@ public:
     virtual bool            Erase( const Color& rFillColor ) = 0;
     virtual bool            Scale( const double& rScaleX, const double& rScaleY, BmpScaleFlag nScaleFlag ) = 0;
     virtual bool            Replace( const Color& rSearchColor, const Color& rReplaceColor, sal_uLong nTol ) = 0;
+
+
+    virtual bool GetChecksum(ChecksumType& rChecksum) const
+    {
+        updateChecksum();
+        if (!mbChecksumValid)
+            rChecksum = 0;
+        else
+            rChecksum = mnChecksum;
+        return mbChecksumValid;
+    }
+
+    virtual void InvalidateChecksum()
+    {
+        mbChecksumValid = false;
+    }
+
+protected:
+    ChecksumType mnChecksum;
+    bool         mbChecksumValid;
+
+protected:
+    virtual void updateChecksum() const
+    {
+        if (mbChecksumValid)
+            return;
+
+        ChecksumType nCrc = 0;
+        SalBitmap* pThis = const_cast<SalBitmap*>(this);
+        BitmapBuffer* pBuf = pThis->AcquireBuffer(BITMAP_READ_ACCESS);
+        if (pBuf)
+        {
+            nCrc = vcl_get_checksum(0, pBuf->mpBits, pBuf->mnScanlineSize * pBuf->mnHeight);
+            pThis->ReleaseBuffer(pBuf, BITMAP_READ_ACCESS);
+            pThis->mnChecksum = nCrc;
+            pThis->mbChecksumValid = true;
+        }
+        else
+        {
+            pThis->mbChecksumValid = false;
+        }
+    }
+
+
 };
 
 #endif
diff --git a/vcl/opengl/areaHashCRC64TFragmentShader.glsl b/vcl/opengl/areaHashCRC64TFragmentShader.glsl
new file mode 100644
index 0000000..901b481
--- /dev/null
+++ b/vcl/opengl/areaHashCRC64TFragmentShader.glsl
@@ -0,0 +1,87 @@
+/* -*- 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/.
+ */
+
+/* TODO Use textureOffset for newest version of GLSL */
+
+
+#version 130
+
+uniform sampler2D crc_table;
+uniform sampler2D sampler;
+uniform float xstep;
+uniform float ystep;
+
+varying vec2 tex_coord;
+
+const int scale = 4;
+const float ratio = 16.0;
+
+
+ivec2 crc64( ivec2 hval, int color )
+{
+    int dx = 2 * ((hval[0] ^ color) & 0xff);
+    float s = dx / 255.0;
+    vec4 table_value_lo = round(texture2D( crc_table, vec2( s, 0.0 ) ) * 255.0);
+    s = (dx+1) / 255.0;
+    vec4 table_value_hi = round(texture2D( crc_table, vec2( s, 0.0 ) ) * 255.0);
+
+    int tvalue_lo = int(table_value_lo[0]) | (int(table_value_lo[1]) << 8) | (int(table_value_lo[2]) << 16) | (int(table_value_lo[3]) << 24);
+    int tvalue_hi = int(table_value_hi[0]) | (int(table_value_hi[1]) << 8) | (int(table_value_hi[2]) << 16) | (int(table_value_hi[3]) << 24);
+
+    hval[1] = tvalue_hi ^ (hval[1] >> 8);
+    hval[0] = tvalue_lo ^ ( (hval[1] << 24) | (hval[0] >> 8) );
+
+    return hval;
+}
+
+
+void main(void)
+{
+    ivec2 Crc = ivec2( 0xffffffff, 0xffffffff );
+    vec2 offset = vec2( 0.0, 0.0 );
+    vec2 next_coord = tex_coord.st;
+    for( int y = 0; y < scale && next_coord.y <= 1.0; ++y )
+    {
+        for( int x = 0; x < scale && next_coord.x <= 1.0; ++x )
+        {
+            vec4 pixel = round(texture2D( sampler, next_coord ) * 255.0);
+
+            int r = int(pixel.r); // 0..255
+            int g = int(pixel.g); // 0..255
+            int b = int(pixel.b); // 0..255
+            int a = int(pixel.a); // 0..255
+
+            Crc = crc64( Crc, r );
+            Crc = crc64( Crc, g );
+            Crc = crc64( Crc, b );
+            Crc = crc64( Crc, a );
+
+            offset.x += xstep;
+            next_coord = tex_coord.st + offset;
+        }
+        offset.y += ystep;
+        offset.x = 0.0;
+        next_coord = tex_coord.st + offset;
+    }
+
+    Crc[0] = ~Crc[0];
+    Crc[1] = ~Crc[1];
+
+    int Hash = Crc[0] ^ Crc[1];
+
+    float fr = ( Hash        & 0xff) / 255.0;
+    float fg = ((Hash >> 8)  & 0xff) / 255.0;
+    float fb = ((Hash >> 16) & 0xff) / 255.0;
+    float fa = ((Hash >> 24) & 0xff) / 255.0;
+
+
+     gl_FragColor = vec4(fr, fg, fb, fa);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/opengl/program.cxx b/vcl/opengl/program.cxx
index b1d3cfe..eec4e92 100644
--- a/vcl/opengl/program.cxx
+++ b/vcl/opengl/program.cxx
@@ -276,7 +276,7 @@ void OpenGLProgram::SetBlendMode( GLenum nSFactor, GLenum nDFactor )
     mbBlending = true;
 }
 
-bool OpenGLProgram::DrawTexture( OpenGLTexture& rTexture )
+bool OpenGLProgram::DrawTexture( const OpenGLTexture& rTexture )
 {
     if (!rTexture)
         return false;
diff --git a/vcl/opengl/salbmp.cxx b/vcl/opengl/salbmp.cxx
index 527a198..3f049b4 100644
--- a/vcl/opengl/salbmp.cxx
+++ b/vcl/opengl/salbmp.cxx
@@ -22,6 +22,7 @@
 #include <vcl/opengl/OpenGLHelper.hxx>
 
 #include "vcl/bitmap.hxx"
+#include "vcl/checksum.hxx"
 #include "vcl/outdev.hxx"
 #include "vcl/salbtype.hxx"
 #include "svdata.hxx"
@@ -508,6 +509,105 @@ sal_uInt16 OpenGLSalBitmap::GetBitCount() const
     return mnBits;
 }
 
+bool OpenGLSalBitmap::calcChecksumGL(OpenGLTexture& rInputTexture, ChecksumType& rChecksum) const
+{
+    OUString FragShader("areaHashCRC64TFragmentShader");
+
+    static const OpenGLTexture aCRCTableTexture(512, 1, GL_RGBA, GL_UNSIGNED_BYTE,
+            (sal_uInt8*)(vcl_get_crc64_table()));
+
+    // First Pass
+
+    int nWidth = rInputTexture.GetWidth();
+    int nHeight = rInputTexture.GetHeight();
+
+    OpenGLProgram* pProgram = mpContext->UseProgram("textureVertexShader", FragShader);
+    if (pProgram == 0)
+        return false;
+
+    int nNewWidth = ceil( nWidth / 4.0 );
+    int nNewHeight = ceil( nHeight / 4.0 );
+
+    OpenGLTexture aFirstPassTexture = OpenGLTexture(nNewWidth, nNewHeight);
+    OpenGLFramebuffer* pFramebuffer = mpContext->AcquireFramebuffer(aFirstPassTexture);
+
+    pProgram->SetUniform1f( "xstep", 1.0 / mnWidth );
+    pProgram->SetUniform1f( "ystep", 1.0 / mnHeight );
+
+    pProgram->SetTexture("crc_table", (OpenGLTexture&)(aCRCTableTexture));
+    pProgram->SetTexture("sampler", rInputTexture);
+    pProgram->DrawTexture(rInputTexture);
+    pProgram->Clean();
+
+    OpenGLContext::ReleaseFramebuffer(pFramebuffer);
+
+    CHECK_GL_ERROR();
+
+
+    // Second Pass
+
+    nWidth = aFirstPassTexture.GetWidth();
+    nHeight = aFirstPassTexture.GetHeight();
+
+    pProgram = mpContext->UseProgram("textureVertexShader", FragShader);
+    if (pProgram == 0)
+        return false;
+
+    nNewWidth = ceil( nWidth / 4.0 );
+    nNewHeight = ceil( nHeight / 4.0 );
+
+    OpenGLTexture aSecondPassTexture = OpenGLTexture(nNewWidth, nNewHeight);
+    pFramebuffer = mpContext->AcquireFramebuffer(aSecondPassTexture);
+
+    pProgram->SetUniform1f( "xstep", 1.0 / mnWidth );
+    pProgram->SetUniform1f( "ystep", 1.0 / mnHeight );
+
+    pProgram->SetTexture("crc_table", (OpenGLTexture&)(aCRCTableTexture));
+    pProgram->SetTexture("sampler", aFirstPassTexture);
+    pProgram->DrawTexture(aFirstPassTexture);
+    pProgram->Clean();
+
+    OpenGLContext::ReleaseFramebuffer(pFramebuffer);
+
+    CHECK_GL_ERROR();
+
+    // Final CRC on CPU
+    OpenGLTexture& aFinalTexture = aSecondPassTexture;
+    std::vector<sal_uInt8> aBuf( aFinalTexture.GetWidth() * aFinalTexture.GetHeight() * 4 );
+    aFinalTexture.Read(GL_RGBA, GL_UNSIGNED_BYTE, aBuf.data());
+
+    ChecksumType nCrc = vcl_get_checksum(0, aBuf.data(), aBuf.size());
+
+    rChecksum = nCrc;
+    return true;
+}
+
+void OpenGLSalBitmap::updateChecksum() const
+{
+    if (mbChecksumValid)
+        return;
+
+    OpenGLSalBitmap* pThis = const_cast<OpenGLSalBitmap*>(this);
+
+    if (!mpContext)
+    {
+        pThis->CreateTexture();
+    }
+
+    OpenGLTexture& rInputTexture = pThis->maTexture;
+    int nWidth = rInputTexture.GetWidth();
+    int nHeight = rInputTexture.GetHeight();
+
+    if( (nWidth * nHeight) < (1024*768) || nWidth < 128 || nHeight < 128 )
+    {
+        SalBitmap::updateChecksum();
+    }
+    else
+    {
+        pThis->mbChecksumValid = calcChecksumGL(rInputTexture, pThis->mnChecksum);
+    }
+}
+
 OpenGLContext* OpenGLSalBitmap::GetBitmapContext()
 {
     return ImplGetDefaultWindow()->GetGraphics()->GetOpenGLContext();
@@ -581,6 +681,7 @@ void OpenGLSalBitmap::ReleaseBuffer( BitmapBuffer* pBuffer, BitmapAccessMode nMo
     {
         maTexture = OpenGLTexture();
         mbDirtyTexture = true;
+        mbChecksumValid = false;
     }
     // The palette is modified on read during the BitmapWriteAccess,
     // but of course, often it is not modified; interesting.
diff --git a/vcl/source/bitmap/checksum.cxx b/vcl/source/bitmap/checksum.cxx
new file mode 100644
index 0000000..3c9a8a6
--- /dev/null
+++ b/vcl/source/bitmap/checksum.cxx
@@ -0,0 +1,154 @@
+/* -*- 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 <sal/types.h>
+#include <vcl/checksum.hxx>
+
+
+/*========================================================================
+ *
+ * vcl_crc64Table (CRC polynomial 0x95AC9329AC4BC9B5ULL).
+ *
+ *======================================================================*/
+static const sal_uInt64 vcl_crc64Table[256] = {
+  0x0000000000000000ULL, 0x7ad870c830358979ULL, 0xf5b0e190606b12f2ULL,
+  0x8f689158505e9b8bULL, 0xc038e5739841b68fULL, 0xbae095bba8743ff6ULL,
+  0x358804e3f82aa47dULL, 0x4f50742bc81f2d04ULL, 0xab28ecb46814fe75ULL,
+  0xd1f09c7c5821770cULL, 0x5e980d24087fec87ULL, 0x24407dec384a65feULL,
+  0x6b1009c7f05548faULL, 0x11c8790fc060c183ULL, 0x9ea0e857903e5a08ULL,
+  0xe478989fa00bd371ULL, 0x7d08ff3b88be6f81ULL, 0x07d08ff3b88be6f8ULL,
+  0x88b81eabe8d57d73ULL, 0xf2606e63d8e0f40aULL, 0xbd301a4810ffd90eULL,
+  0xc7e86a8020ca5077ULL, 0x4880fbd87094cbfcULL, 0x32588b1040a14285ULL,
+  0xd620138fe0aa91f4ULL, 0xacf86347d09f188dULL, 0x2390f21f80c18306ULL,
+  0x594882d7b0f40a7fULL, 0x1618f6fc78eb277bULL, 0x6cc0863448deae02ULL,
+  0xe3a8176c18803589ULL, 0x997067a428b5bcf0ULL, 0xfa11fe77117cdf02ULL,
+  0x80c98ebf2149567bULL, 0x0fa11fe77117cdf0ULL, 0x75796f2f41224489ULL,
+  0x3a291b04893d698dULL, 0x40f16bccb908e0f4ULL, 0xcf99fa94e9567b7fULL,
+  0xb5418a5cd963f206ULL, 0x513912c379682177ULL, 0x2be1620b495da80eULL,
+  0xa489f35319033385ULL, 0xde51839b2936bafcULL, 0x9101f7b0e12997f8ULL,
+  0xebd98778d11c1e81ULL, 0x64b116208142850aULL, 0x1e6966e8b1770c73ULL,
+  0x8719014c99c2b083ULL, 0xfdc17184a9f739faULL, 0x72a9e0dcf9a9a271ULL,
+  0x08719014c99c2b08ULL, 0x4721e43f0183060cULL, 0x3df994f731b68f75ULL,
+  0xb29105af61e814feULL, 0xc849756751dd9d87ULL, 0x2c31edf8f1d64ef6ULL,
+  0x56e99d30c1e3c78fULL, 0xd9810c6891bd5c04ULL, 0xa3597ca0a188d57dULL,
+  0xec09088b6997f879ULL, 0x96d1784359a27100ULL, 0x19b9e91b09fcea8bULL,
+  0x636199d339c963f2ULL, 0xdf7adabd7a6e2d6fULL, 0xa5a2aa754a5ba416ULL,
+  0x2aca3b2d1a053f9dULL, 0x50124be52a30b6e4ULL, 0x1f423fcee22f9be0ULL,
+  0x659a4f06d21a1299ULL, 0xeaf2de5e82448912ULL, 0x902aae96b271006bULL,
+  0x74523609127ad31aULL, 0x0e8a46c1224f5a63ULL, 0x81e2d7997211c1e8ULL,
+  0xfb3aa75142244891ULL, 0xb46ad37a8a3b6595ULL, 0xceb2a3b2ba0eececULL,
+  0x41da32eaea507767ULL, 0x3b024222da65fe1eULL, 0xa2722586f2d042eeULL,
+  0xd8aa554ec2e5cb97ULL, 0x57c2c41692bb501cULL, 0x2d1ab4dea28ed965ULL,
+  0x624ac0f56a91f461ULL, 0x1892b03d5aa47d18ULL, 0x97fa21650afae693ULL,
+  0xed2251ad3acf6feaULL, 0x095ac9329ac4bc9bULL, 0x7382b9faaaf135e2ULL,
+  0xfcea28a2faafae69ULL, 0x8632586aca9a2710ULL, 0xc9622c4102850a14ULL,
+  0xb3ba5c8932b0836dULL, 0x3cd2cdd162ee18e6ULL, 0x460abd1952db919fULL,
+  0x256b24ca6b12f26dULL, 0x5fb354025b277b14ULL, 0xd0dbc55a0b79e09fULL,
+  0xaa03b5923b4c69e6ULL, 0xe553c1b9f35344e2ULL, 0x9f8bb171c366cd9bULL,
+  0x10e3202993385610ULL, 0x6a3b50e1a30ddf69ULL, 0x8e43c87e03060c18ULL,
+  0xf49bb8b633338561ULL, 0x7bf329ee636d1eeaULL, 0x012b592653589793ULL,
+  0x4e7b2d0d9b47ba97ULL, 0x34a35dc5ab7233eeULL, 0xbbcbcc9dfb2ca865ULL,
+  0xc113bc55cb19211cULL, 0x5863dbf1e3ac9decULL, 0x22bbab39d3991495ULL,
+  0xadd33a6183c78f1eULL, 0xd70b4aa9b3f20667ULL, 0x985b3e827bed2b63ULL,
+  0xe2834e4a4bd8a21aULL, 0x6debdf121b863991ULL, 0x1733afda2bb3b0e8ULL,
+  0xf34b37458bb86399ULL, 0x8993478dbb8deae0ULL, 0x06fbd6d5ebd3716bULL,
+  0x7c23a61ddbe6f812ULL, 0x3373d23613f9d516ULL, 0x49aba2fe23cc5c6fULL,
+  0xc6c333a67392c7e4ULL, 0xbc1b436e43a74e9dULL, 0x95ac9329ac4bc9b5ULL,
+  0xef74e3e19c7e40ccULL, 0x601c72b9cc20db47ULL, 0x1ac40271fc15523eULL,
+  0x5594765a340a7f3aULL, 0x2f4c0692043ff643ULL, 0xa02497ca54616dc8ULL,
+  0xdafce7026454e4b1ULL, 0x3e847f9dc45f37c0ULL, 0x445c0f55f46abeb9ULL,
+  0xcb349e0da4342532ULL, 0xb1eceec59401ac4bULL, 0xfebc9aee5c1e814fULL,
+  0x8464ea266c2b0836ULL, 0x0b0c7b7e3c7593bdULL, 0x71d40bb60c401ac4ULL,
+  0xe8a46c1224f5a634ULL, 0x927c1cda14c02f4dULL, 0x1d148d82449eb4c6ULL,
+  0x67ccfd4a74ab3dbfULL, 0x289c8961bcb410bbULL, 0x5244f9a98c8199c2ULL,
+  0xdd2c68f1dcdf0249ULL, 0xa7f41839ecea8b30ULL, 0x438c80a64ce15841ULL,
+  0x3954f06e7cd4d138ULL, 0xb63c61362c8a4ab3ULL, 0xcce411fe1cbfc3caULL,
+  0x83b465d5d4a0eeceULL, 0xf96c151de49567b7ULL, 0x76048445b4cbfc3cULL,
+  0x0cdcf48d84fe7545ULL, 0x6fbd6d5ebd3716b7ULL, 0x15651d968d029fceULL,
+  0x9a0d8ccedd5c0445ULL, 0xe0d5fc06ed698d3cULL, 0xaf85882d2576a038ULL,
+  0xd55df8e515432941ULL, 0x5a3569bd451db2caULL, 0x20ed197575283bb3ULL,
+  0xc49581ead523e8c2ULL, 0xbe4df122e51661bbULL, 0x3125607ab548fa30ULL,
+  0x4bfd10b2857d7349ULL, 0x04ad64994d625e4dULL, 0x7e7514517d57d734ULL,
+  0xf11d85092d094cbfULL, 0x8bc5f5c11d3cc5c6ULL, 0x12b5926535897936ULL,
+  0x686de2ad05bcf04fULL, 0xe70573f555e26bc4ULL, 0x9ddd033d65d7e2bdULL,
+  0xd28d7716adc8cfb9ULL, 0xa85507de9dfd46c0ULL, 0x273d9686cda3dd4bULL,
+  0x5de5e64efd965432ULL, 0xb99d7ed15d9d8743ULL, 0xc3450e196da80e3aULL,
+  0x4c2d9f413df695b1ULL, 0x36f5ef890dc31cc8ULL, 0x79a59ba2c5dc31ccULL,
+  0x037deb6af5e9b8b5ULL, 0x8c157a32a5b7233eULL, 0xf6cd0afa9582aa47ULL,
+  0x4ad64994d625e4daULL, 0x300e395ce6106da3ULL, 0xbf66a804b64ef628ULL,
+  0xc5bed8cc867b7f51ULL, 0x8aeeace74e645255ULL, 0xf036dc2f7e51db2cULL,
+  0x7f5e4d772e0f40a7ULL, 0x05863dbf1e3ac9deULL, 0xe1fea520be311aafULL,
+  0x9b26d5e88e0493d6ULL, 0x144e44b0de5a085dULL, 0x6e963478ee6f8124ULL,
+  0x21c640532670ac20ULL, 0x5b1e309b16452559ULL, 0xd476a1c3461bbed2ULL,
+  0xaeaed10b762e37abULL, 0x37deb6af5e9b8b5bULL, 0x4d06c6676eae0222ULL,
+  0xc26e573f3ef099a9ULL, 0xb8b627f70ec510d0ULL, 0xf7e653dcc6da3dd4ULL,
+  0x8d3e2314f6efb4adULL, 0x0256b24ca6b12f26ULL, 0x788ec2849684a65fULL,
+  0x9cf65a1b368f752eULL, 0xe62e2ad306bafc57ULL, 0x6946bb8b56e467dcULL,
+  0x139ecb4366d1eea5ULL, 0x5ccebf68aecec3a1ULL, 0x2616cfa09efb4ad8ULL,
+  0xa97e5ef8cea5d153ULL, 0xd3a62e30fe90582aULL, 0xb0c7b7e3c7593bd8ULL,
+  0xca1fc72bf76cb2a1ULL, 0x45775673a732292aULL, 0x3faf26bb9707a053ULL,
+  0x70ff52905f188d57ULL, 0x0a2722586f2d042eULL, 0x854fb3003f739fa5ULL,
+  0xff97c3c80f4616dcULL, 0x1bef5b57af4dc5adULL, 0x61372b9f9f784cd4ULL,
+  0xee5fbac7cf26d75fULL, 0x9487ca0fff135e26ULL, 0xdbd7be24370c7322ULL,
+  0xa10fceec0739fa5bULL, 0x2e675fb4576761d0ULL, 0x54bf2f7c6752e8a9ULL,
+  0xcdcf48d84fe75459ULL, 0xb71738107fd2dd20ULL, 0x387fa9482f8c46abULL,
+  0x42a7d9801fb9cfd2ULL, 0x0df7adabd7a6e2d6ULL, 0x772fdd63e7936bafULL,
+  0xf8474c3bb7cdf024ULL, 0x829f3cf387f8795dULL, 0x66e7a46c27f3aa2cULL,
+  0x1c3fd4a417c62355ULL, 0x935745fc4798b8deULL, 0xe98f353477ad31a7ULL,
+  0xa6df411fbfb21ca3ULL, 0xdc0731d78f8795daULL, 0x536fa08fdfd90e51ULL,
+  0x29b7d047efec8728ULL
+};
+
+/*========================================================================
+ *
+ * vcl_crc64 implementation.
+ *
+ *======================================================================*/
+#define UPDCRC64(crc, octet) \
+    (vcl_crc64Table[((crc) ^ (octet)) & 0xff] ^ ((crc) >> 8))
+
+/*
+ * vcl_crc64.
+ */
+sal_uInt64 SAL_CALL vcl_crc64 (
+    sal_uInt64  Crc,
+    const void *Data, sal_uInt32 DatLen)  SAL_THROW_EXTERN_C()
+{
+    if (Data)
+    {
+        const sal_uInt8 *p = static_cast<const sal_uInt8 *>(Data);
+        const sal_uInt8 *q = p + DatLen;
+
+        Crc = ~Crc;
+        while (p < q)
+            Crc = UPDCRC64(Crc, *(p++));
+        Crc = ~Crc;
+    }
+    return Crc;
+}
+
+/*
+ * vcl_get_crc64_table.
+ */
+const sal_uInt64* vcl_get_crc64_table()
+{
+    return vcl_crc64Table;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/source/gdi/animate.cxx b/vcl/source/gdi/animate.cxx
index 4dd37f8..8e76d7e 100644
--- a/vcl/source/gdi/animate.cxx
+++ b/vcl/source/gdi/animate.cxx
@@ -31,31 +31,31 @@
 
 sal_uLong Animation::mnAnimCount = 0UL;
 
-sal_uLong AnimationBitmap::GetChecksum() const
+BitmapChecksum AnimationBitmap::GetChecksum() const
 {
-    sal_uInt32  nCrc = aBmpEx.GetChecksum();
+    BitmapChecksum  nCrc = aBmpEx.GetChecksum();
     SVBT32      aBT32;
 
     UInt32ToSVBT32( aPosPix.X(), aBT32 );
-    nCrc = rtl_crc32( nCrc, aBT32, 4 );
+    nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
     UInt32ToSVBT32( aPosPix.Y(), aBT32 );
-    nCrc = rtl_crc32( nCrc, aBT32, 4 );
+    nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
     UInt32ToSVBT32( aSizePix.Width(), aBT32 );
-    nCrc = rtl_crc32( nCrc, aBT32, 4 );
+    nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
     UInt32ToSVBT32( aSizePix.Height(), aBT32 );
-    nCrc = rtl_crc32( nCrc, aBT32, 4 );
+    nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
     UInt32ToSVBT32( (long) nWait, aBT32 );
-    nCrc = rtl_crc32( nCrc, aBT32, 4 );
+    nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
     UInt32ToSVBT32( (long) eDisposal, aBT32 );
-    nCrc = rtl_crc32( nCrc, aBT32, 4 );
+    nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
     UInt32ToSVBT32( (long) bUserInput, aBT32 );
-    nCrc = rtl_crc32( nCrc, aBT32, 4 );
+    nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
     return nCrc;
 }
@@ -206,27 +206,28 @@ sal_uLong Animation::GetSizeBytes() const
     return nSizeBytes;
 }
 
-sal_uLong Animation::GetChecksum() const
+BitmapChecksum Animation::GetChecksum() const
 {
     SVBT32      aBT32;
-    sal_uInt32  nCrc = GetBitmapEx().GetChecksum();
+    BitmapChecksumOctetArray aBCOA;
+    BitmapChecksum  nCrc = GetBitmapEx().GetChecksum();
 
     UInt32ToSVBT32( maList.size(), aBT32 );
-    nCrc = rtl_crc32( nCrc, aBT32, 4 );
+    nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
     UInt32ToSVBT32( maGlobalSize.Width(), aBT32 );
-    nCrc = rtl_crc32( nCrc, aBT32, 4 );
+    nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
     UInt32ToSVBT32( maGlobalSize.Height(), aBT32 );
-    nCrc = rtl_crc32( nCrc, aBT32, 4 );
+    nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
     UInt32ToSVBT32( (long) meCycleMode, aBT32 );
-    nCrc = rtl_crc32( nCrc, aBT32, 4 );
+    nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
     for( size_t i = 0, nCount = maList.size(); i < nCount; i++ )
     {
-        UInt32ToSVBT32( maList[ i ]->GetChecksum(), aBT32 );
-        nCrc = rtl_crc32( nCrc, aBT32, 4 );
+        BCToBCOA( maList[ i ]->GetChecksum(), aBCOA );
+        nCrc = vcl_get_checksum( nCrc, aBCOA, BITMAP_CHECKSUM_SIZE );
     }
 
     return nCrc;
diff --git a/vcl/source/gdi/bitmap.cxx b/vcl/source/gdi/bitmap.cxx
index 51e5db8..45ecf09 100644
--- a/vcl/source/gdi/bitmap.cxx
+++ b/vcl/source/gdi/bitmap.cxx
@@ -245,10 +245,8 @@ Bitmap& Bitmap::operator=( const Bitmap& rBitmap )
 
 bool Bitmap::IsEqual( const Bitmap& rBmp ) const
 {
-    return( IsSameInstance( rBmp ) ||
-            ( rBmp.GetSizePixel() == GetSizePixel() &&
-              rBmp.GetBitCount() == GetBitCount() &&
-              rBmp.GetChecksum() == GetChecksum() ) );
+    return(IsSameInstance(rBmp) || // Includes both are nullptr
+        (rBmp.mpImpBmp && mpImpBmp && mpImpBmp->ImplIsEqual(*rBmp.mpImpBmp)));
 }
 
 void Bitmap::SetEmpty()
@@ -286,56 +284,13 @@ bool Bitmap::HasGreyPalette() const
     return bRet;
 }
 
-sal_uLong Bitmap::GetChecksum() const
+BitmapChecksum Bitmap::GetChecksum() const
 {
-    sal_uLong nRet = 0UL;
+    BitmapChecksum nRet = 0;
 
     if( mpImpBmp )
     {
         nRet = mpImpBmp->ImplGetChecksum();
-
-        if( !nRet )
-        {
-            BitmapReadAccess* pRAcc = const_cast<Bitmap*>(this)->AcquireReadAccess();
-
-            if( pRAcc && pRAcc->Width() && pRAcc->Height() )
-            {
-                sal_uInt32  nCrc = 0;
-                SVBT32      aBT32;
-
-                pRAcc->ImplZeroInitUnusedBits();
-
-                UInt32ToSVBT32( pRAcc->Width(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
-
-                UInt32ToSVBT32( pRAcc->Height(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
-
-                UInt32ToSVBT32( pRAcc->GetBitCount(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
-
-                UInt32ToSVBT32( pRAcc->GetColorMask().GetRedMask(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
-
-                UInt32ToSVBT32( pRAcc->GetColorMask().GetGreenMask(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
-
-                UInt32ToSVBT32( pRAcc->GetColorMask().GetBlueMask(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
-
-                if( pRAcc->HasPalette() )
-                {
-                    nCrc = rtl_crc32( nCrc, pRAcc->GetPalette().ImplGetColorBuffer(),
-                                      pRAcc->GetPaletteEntryCount() * sizeof( BitmapColor ) );
-                }
-
-                nCrc = rtl_crc32( nCrc, pRAcc->GetBuffer(), pRAcc->GetScanlineSize() * pRAcc->Height() );
-
-                mpImpBmp->ImplSetChecksum( nRet = nCrc );
-            }
-
-            if (pRAcc) ReleaseAccess( pRAcc );
-        }
     }
 
     return nRet;
@@ -549,6 +504,7 @@ bool Bitmap::Invert()
                     pAcc->SetPixel( nY, nX, pAcc->GetPixel( nY, nX ).Invert() );
         }
 
+        mpImpBmp->ImplInvalidateChecksum();
         ReleaseAccess( pAcc );
         bRet = true;
     }
diff --git a/vcl/source/gdi/bitmapex.cxx b/vcl/source/gdi/bitmapex.cxx
index e6fa951..768cd74 100644
--- a/vcl/source/gdi/bitmapex.cxx
+++ b/vcl/source/gdi/bitmapex.cxx
@@ -316,21 +316,22 @@ sal_uLong BitmapEx::GetSizeBytes() const
     return nSizeBytes;
 }
 
-sal_uLong BitmapEx::GetChecksum() const
+BitmapChecksum BitmapEx::GetChecksum() const
 {
-    sal_uInt32  nCrc = aBitmap.GetChecksum();
+    BitmapChecksum  nCrc = aBitmap.GetChecksum();
     SVBT32      aBT32;
+    BitmapChecksumOctetArray aBCOA;
 
     UInt32ToSVBT32( (long) eTransparent, aBT32 );
-    nCrc = rtl_crc32( nCrc, aBT32, 4 );
+    nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
     UInt32ToSVBT32( (long) bAlpha, aBT32 );
-    nCrc = rtl_crc32( nCrc, aBT32, 4 );
+    nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
     if( ( TRANSPARENT_BITMAP == eTransparent ) && !aMask.IsEmpty() )
     {
-        UInt32ToSVBT32( aMask.GetChecksum(), aBT32 );
-        nCrc = rtl_crc32( nCrc, aBT32, 4 );
+        BCToBCOA( aMask.GetChecksum(), aBCOA );
+        nCrc = vcl_get_checksum( nCrc, aBCOA, BITMAP_CHECKSUM_SIZE );
     }
 
     return nCrc;
diff --git a/vcl/source/gdi/gdimtf.cxx b/vcl/source/gdi/gdimtf.cxx
index 94be557..8d283df 100644
--- a/vcl/source/gdi/gdimtf.cxx
+++ b/vcl/source/gdi/gdimtf.cxx
@@ -2340,14 +2340,15 @@ GDIMetaFile GDIMetaFile::GetMonochromeMtf( const Color& rColor ) const
     return aRet;
 }
 
-sal_uLong GDIMetaFile::GetChecksum() const
+BitmapChecksum GDIMetaFile::GetChecksum() const
 {
-    GDIMetaFile         aMtf;
-    SvMemoryStream      aMemStm( 65535, 65535 );
-    ImplMetaWriteData   aWriteData;
-    SVBT16              aBT16;
-    SVBT32              aBT32;
-    sal_uLong               nCrc = 0;
+    GDIMetaFile                 aMtf;
+    SvMemoryStream              aMemStm( 65535, 65535 );
+    ImplMetaWriteData           aWriteData;
+    SVBT16                      aBT16;
+    SVBT32                      aBT32;
+    BitmapChecksumOctetArray    aBCOA;
+    BitmapChecksum              nCrc = 0;
 
     aWriteData.meActualCharSet = aMemStm.GetStreamCharSet();
     for( size_t i = 0, nObjCount = GetActionSize(); i < nObjCount; i++ )
@@ -2361,16 +2362,16 @@ sal_uLong GDIMetaFile::GetChecksum() const
                 MetaBmpAction* pAct = static_cast<MetaBmpAction*>(pAction);
 
                 ShortToSVBT16( static_cast<sal_uInt16>(pAct->GetType()), aBT16 );
-                nCrc = rtl_crc32( nCrc, aBT16, 2 );
+                nCrc = vcl_get_checksum( nCrc, aBT16, 2 );
 
-                UInt32ToSVBT32( pAct->GetBitmap().GetChecksum(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                BCToBCOA( pAct->GetBitmap().GetChecksum(), aBCOA );
+                nCrc = vcl_get_checksum( nCrc, aBCOA, BITMAP_CHECKSUM_SIZE );
 
                 UInt32ToSVBT32( pAct->GetPoint().X(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetPoint().Y(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
             }
             break;
 
@@ -2379,22 +2380,22 @@ sal_uLong GDIMetaFile::GetChecksum() const
                 MetaBmpScaleAction* pAct = static_cast<MetaBmpScaleAction*>(pAction);
 
                 ShortToSVBT16( static_cast<sal_uInt16>(pAct->GetType()), aBT16 );
-                nCrc = rtl_crc32( nCrc, aBT16, 2 );
+                nCrc = vcl_get_checksum( nCrc, aBT16, 2 );
 
-                UInt32ToSVBT32( pAct->GetBitmap().GetChecksum(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                BCToBCOA( pAct->GetBitmap().GetChecksum(), aBCOA );
+                nCrc = vcl_get_checksum( nCrc, aBCOA, BITMAP_CHECKSUM_SIZE );
 
                 UInt32ToSVBT32( pAct->GetPoint().X(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetPoint().Y(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetSize().Width(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetSize().Height(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
             }
             break;
 
@@ -2403,34 +2404,34 @@ sal_uLong GDIMetaFile::GetChecksum() const
                 MetaBmpScalePartAction* pAct = static_cast<MetaBmpScalePartAction*>(pAction);
 
                 ShortToSVBT16( static_cast<sal_uInt16>(pAct->GetType()), aBT16 );
-                nCrc = rtl_crc32( nCrc, aBT16, 2 );
+                nCrc = vcl_get_checksum( nCrc, aBT16, 2 );
 
-                UInt32ToSVBT32( pAct->GetBitmap().GetChecksum(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                BCToBCOA( pAct->GetBitmap().GetChecksum(), aBCOA );
+                nCrc = vcl_get_checksum( nCrc, aBCOA, BITMAP_CHECKSUM_SIZE );
 
                 UInt32ToSVBT32( pAct->GetDestPoint().X(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetDestPoint().Y(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetDestSize().Width(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetDestSize().Height(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetSrcPoint().X(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetSrcPoint().Y(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetSrcSize().Width(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetSrcSize().Height(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
             }
             break;
 
@@ -2439,16 +2440,16 @@ sal_uLong GDIMetaFile::GetChecksum() const
                 MetaBmpExAction* pAct = static_cast<MetaBmpExAction*>(pAction);
 
                 ShortToSVBT16( static_cast<sal_uInt16>(pAct->GetType()), aBT16 );
-                nCrc = rtl_crc32( nCrc, aBT16, 2 );
+                nCrc = vcl_get_checksum( nCrc, aBT16, 2 );
 
-                UInt32ToSVBT32( pAct->GetBitmapEx().GetChecksum(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                BCToBCOA( pAct->GetBitmapEx().GetChecksum(), aBCOA );
+                nCrc = vcl_get_checksum( nCrc, aBCOA, BITMAP_CHECKSUM_SIZE );
 
                 UInt32ToSVBT32( pAct->GetPoint().X(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetPoint().Y(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
             }
             break;
 
@@ -2457,22 +2458,22 @@ sal_uLong GDIMetaFile::GetChecksum() const
                 MetaBmpExScaleAction* pAct = static_cast<MetaBmpExScaleAction*>(pAction);
 
                 ShortToSVBT16( static_cast<sal_uInt16>(pAct->GetType()), aBT16 );
-                nCrc = rtl_crc32( nCrc, aBT16, 2 );
+                nCrc = vcl_get_checksum( nCrc, aBT16, 2 );
 
-                UInt32ToSVBT32( pAct->GetBitmapEx().GetChecksum(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                BCToBCOA( pAct->GetBitmapEx().GetChecksum(), aBCOA );
+                nCrc = vcl_get_checksum( nCrc, aBCOA, BITMAP_CHECKSUM_SIZE );
 
                 UInt32ToSVBT32( pAct->GetPoint().X(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetPoint().Y(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetSize().Width(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetSize().Height(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
             }
             break;
 
@@ -2481,34 +2482,34 @@ sal_uLong GDIMetaFile::GetChecksum() const
                 MetaBmpExScalePartAction* pAct = static_cast<MetaBmpExScalePartAction*>(pAction);
 
                 ShortToSVBT16( static_cast<sal_uInt16>(pAct->GetType()), aBT16 );
-                nCrc = rtl_crc32( nCrc, aBT16, 2 );
+                nCrc = vcl_get_checksum( nCrc, aBT16, 2 );
 
-                UInt32ToSVBT32( pAct->GetBitmapEx().GetChecksum(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                BCToBCOA( pAct->GetBitmapEx().GetChecksum(), aBCOA );
+                nCrc = vcl_get_checksum( nCrc, aBCOA, BITMAP_CHECKSUM_SIZE );
 
                 UInt32ToSVBT32( pAct->GetDestPoint().X(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetDestPoint().Y(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetDestSize().Width(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetDestSize().Height(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetSrcPoint().X(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetSrcPoint().Y(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetSrcSize().Width(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetSrcSize().Height(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
             }
             break;
 
@@ -2517,19 +2518,19 @@ sal_uLong GDIMetaFile::GetChecksum() const
                 MetaMaskAction* pAct = static_cast<MetaMaskAction*>(pAction);
 
                 ShortToSVBT16( static_cast<sal_uInt16>(pAct->GetType()), aBT16 );
-                nCrc = rtl_crc32( nCrc, aBT16, 2 );
+                nCrc = vcl_get_checksum( nCrc, aBT16, 2 );
 
-                UInt32ToSVBT32( pAct->GetBitmap().GetChecksum(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                BCToBCOA( pAct->GetBitmap().GetChecksum(), aBCOA );
+                nCrc = vcl_get_checksum( nCrc, aBCOA, BITMAP_CHECKSUM_SIZE );
 
                 UInt32ToSVBT32( pAct->GetColor().GetColor(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetPoint().X(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetPoint().Y(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
             }
             break;
 
@@ -2538,25 +2539,25 @@ sal_uLong GDIMetaFile::GetChecksum() const
                 MetaMaskScaleAction* pAct = static_cast<MetaMaskScaleAction*>(pAction);
 
                 ShortToSVBT16( static_cast<sal_uInt16>(pAct->GetType()), aBT16 );
-                nCrc = rtl_crc32( nCrc, aBT16, 2 );
+                nCrc = vcl_get_checksum( nCrc, aBT16, 2 );
 
-                UInt32ToSVBT32( pAct->GetBitmap().GetChecksum(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                BCToBCOA( pAct->GetBitmap().GetChecksum(), aBCOA );
+                nCrc = vcl_get_checksum( nCrc, aBCOA, BITMAP_CHECKSUM_SIZE );
 
                 UInt32ToSVBT32( pAct->GetColor().GetColor(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetPoint().X(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetPoint().Y(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetSize().Width(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetSize().Height(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
             }
             break;
 
@@ -2565,44 +2566,44 @@ sal_uLong GDIMetaFile::GetChecksum() const
                 MetaMaskScalePartAction* pAct = static_cast<MetaMaskScalePartAction*>(pAction);
 
                 ShortToSVBT16( static_cast<sal_uInt16>(pAct->GetType()), aBT16 );
-                nCrc = rtl_crc32( nCrc, aBT16, 2 );
+                nCrc = vcl_get_checksum( nCrc, aBT16, 2 );
 
-                UInt32ToSVBT32( pAct->GetBitmap().GetChecksum(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                BCToBCOA( pAct->GetBitmap().GetChecksum(), aBCOA );
+                nCrc = vcl_get_checksum( nCrc, aBCOA, BITMAP_CHECKSUM_SIZE );
 
                 UInt32ToSVBT32( pAct->GetColor().GetColor(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetDestPoint().X(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetDestPoint().Y(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetDestSize().Width(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetDestSize().Height(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetSrcPoint().X(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetSrcPoint().Y(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetSrcSize().Width(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
 
                 UInt32ToSVBT32( pAct->GetSrcSize().Height(), aBT32 );
-                nCrc = rtl_crc32( nCrc, aBT32, 4 );
+                nCrc = vcl_get_checksum( nCrc, aBT32, 4 );
             }
             break;
 
             case MetaActionType::EPS :
             {
                 MetaEPSAction* pAct = static_cast<MetaEPSAction*>(pAction);
-                nCrc = rtl_crc32( nCrc, pAct->GetLink().GetData(), pAct->GetLink().GetDataSize() );
+                nCrc = vcl_get_checksum( nCrc, pAct->GetLink().GetData(), pAct->GetLink().GetDataSize() );
             }
             break;
 
@@ -2631,9 +2632,9 @@ sal_uLong GDIMetaFile::GetChecksum() const
                             const basegfx::B2DPoint aPoint(aPolygon.getB2DPoint(b));
 
                             DoubleToSVBT64(aPoint.getX(), aSVBT64);
-                            nCrc = rtl_crc32(nCrc, aSVBT64, 8);
+                            nCrc = vcl_get_checksum(nCrc, aSVBT64, 8);
                             DoubleToSVBT64(aPoint.getY(), aSVBT64);
-                            nCrc = rtl_crc32(nCrc, aSVBT64, 8);
+                            nCrc = vcl_get_checksum(nCrc, aSVBT64, 8);
 
                             if(bControl)
                             {
@@ -2642,9 +2643,9 @@ sal_uLong GDIMetaFile::GetChecksum() const
                                     const basegfx::B2DPoint aCtrl(aPolygon.getPrevControlPoint(b));
 
                                     DoubleToSVBT64(aCtrl.getX(), aSVBT64);
-                                    nCrc = rtl_crc32(nCrc, aSVBT64, 8);
+                                    nCrc = vcl_get_checksum(nCrc, aSVBT64, 8);
                                     DoubleToSVBT64(aCtrl.getY(), aSVBT64);
-                                    nCrc = rtl_crc32(nCrc, aSVBT64, 8);
+                                    nCrc = vcl_get_checksum(nCrc, aSVBT64, 8);
                                 }
 
                                 if(aPolygon.isNextControlPointUsed(b))
@@ -2652,21 +2653,21 @@ sal_uLong GDIMetaFile::GetChecksum() const
                                     const basegfx::B2DPoint aCtrl(aPolygon.getNextControlPoint(b));
 
                                     DoubleToSVBT64(aCtrl.getX(), aSVBT64);
-                                    nCrc = rtl_crc32(nCrc, aSVBT64, 8);
+                                    nCrc = vcl_get_checksum(nCrc, aSVBT64, 8);
                                     DoubleToSVBT64(aCtrl.getY(), aSVBT64);
-                                    nCrc = rtl_crc32(nCrc, aSVBT64, 8);
+                                    nCrc = vcl_get_checksum(nCrc, aSVBT64, 8);
                                 }
                             }
                         }
                     }
 
                     sal_uInt8 tmp = (sal_uInt8)rAct.IsClipping();
-                    nCrc = rtl_crc32(nCrc, &tmp, 1);
+                    nCrc = vcl_get_checksum(nCrc, &tmp, 1);
                 }
                 else
                 {
                     pAction->Write( aMemStm, &aWriteData );
-                    nCrc = rtl_crc32( nCrc, aMemStm.GetData(), aMemStm.Tell() );
+                    nCrc = vcl_get_checksum( nCrc, aMemStm.GetData(), aMemStm.Tell() );
                     aMemStm.Seek( 0 );
                 }
             }
@@ -2675,7 +2676,7 @@ sal_uLong GDIMetaFile::GetChecksum() const
             default:
             {
                 pAction->Write( aMemStm, &aWriteData );
-                nCrc = rtl_crc32( nCrc, aMemStm.GetData(), aMemStm.Tell() );
+                nCrc = vcl_get_checksum( nCrc, aMemStm.GetData(), aMemStm.Tell() );
                 aMemStm.Seek( 0 );
             }
             break;
diff --git a/vcl/source/gdi/graph.cxx b/vcl/source/gdi/graph.cxx
index 40bd87c..dc4de00 100644
--- a/vcl/source/gdi/graph.cxx
+++ b/vcl/source/gdi/graph.cxx
@@ -552,7 +552,7 @@ bool Graphic::IsLink() const
     return mpImpGraphic->ImplIsLink();
 }
 
-sal_uLong Graphic::GetChecksum() const
+BitmapChecksum Graphic::GetChecksum() const
 {
     return mpImpGraphic->ImplGetChecksum();
 }
diff --git a/vcl/source/gdi/impbmp.cxx b/vcl/source/gdi/impbmp.cxx
index 298bfaa..b79b0d4 100644
--- a/vcl/source/gdi/impbmp.cxx
+++ b/vcl/source/gdi/impbmp.cxx
@@ -26,14 +26,12 @@
 
 ImpBitmap::ImpBitmap() :
             mnRefCount  ( 1 ),
-            mnChecksum  ( 0 ),
             mpSalBitmap ( ImplGetSVData()->mpDefInst->CreateSalBitmap() )
 {
 }
 
 ImpBitmap::ImpBitmap(SalBitmap* pBitmap) :
             mnRefCount  ( 1 ),
-            mnChecksum  ( 0 ),
             mpSalBitmap ( pBitmap )
 {
 }
@@ -43,14 +41,20 @@ ImpBitmap::~ImpBitmap()
     delete mpSalBitmap;
 }
 
-bool ImpBitmap::ImplCreate( const Size& rSize, sal_uInt16 nBitCount, const BitmapPalette& rPal )
+bool ImpBitmap::ImplIsEqual(const ImpBitmap& rBmp) const
+{
+    return (rBmp.ImplGetSize() == ImplGetSize() &&
+        rBmp.ImplGetBitCount() == ImplGetBitCount() &&
+        rBmp.ImplGetChecksum() == ImplGetChecksum());
+}
+
+bool ImpBitmap::ImplCreate(const Size& rSize, sal_uInt16 nBitCount, const BitmapPalette& rPal)
 {
     return mpSalBitmap->Create( rSize, nBitCount, rPal );
 }
 
 bool ImpBitmap::ImplCreate( const ImpBitmap& rImpBitmap )
 {
-    mnChecksum = rImpBitmap.mnChecksum;
     return mpSalBitmap->Create( *rImpBitmap.mpSalBitmap );
 }
 
@@ -85,7 +89,19 @@ void ImpBitmap::ImplReleaseBuffer( BitmapBuffer* pBuffer, BitmapAccessMode nMode
     mpSalBitmap->ReleaseBuffer( pBuffer, nMode );
 
     if( nMode == BITMAP_WRITE_ACCESS )
-        mnChecksum = 0;
+        ImplInvalidateChecksum();
+}
+
+BitmapChecksum ImpBitmap::ImplGetChecksum() const
+{
+    SalBitmap::ChecksumType aChecksum;
+    mpSalBitmap->GetChecksum(aChecksum);
+    return aChecksum;
+}
+
+void ImpBitmap::ImplInvalidateChecksum()
+{
+    mpSalBitmap->InvalidateChecksum();
 }
 
 bool ImpBitmap::ImplScale( const double& rScaleX, const double& rScaleY, BmpScaleFlag nScaleFlag )
diff --git a/vcl/source/gdi/impgraph.cxx b/vcl/source/gdi/impgraph.cxx
index 1c62ab0..a491002 100644
--- a/vcl/source/gdi/impgraph.cxx
+++ b/vcl/source/gdi/impgraph.cxx
@@ -1360,9 +1360,9 @@ bool ImpGraphic::ImplIsLink() const
     return ( mpGfxLink != NULL );
 }
 
-sal_uLong ImpGraphic::ImplGetChecksum() const
+BitmapChecksum ImpGraphic::ImplGetChecksum() const
 {
-    sal_uLong nRet = 0;
+    BitmapChecksum nRet = 0;
 
     if( ImplIsSupportedGraphic() && !ImplIsSwapOut() )
     {
diff --git a/vcl/source/gdi/pdfwriter_impl.cxx b/vcl/source/gdi/pdfwriter_impl.cxx
index f6ff40f..0b7fa46 100644
--- a/vcl/source/gdi/pdfwriter_impl.cxx
+++ b/vcl/source/gdi/pdfwriter_impl.cxx
@@ -11516,7 +11516,7 @@ void PDFWriterImpl::drawJPGBitmap( SvStream& rDCTData, bool bIsTrueColor, const
     aID.m_aPixelSize    = rSizePixel;
     aID.m_nSize         = pStream->Tell();
     pStream->Seek( STREAM_SEEK_TO_BEGIN );
-    aID.m_nChecksum     = rtl_crc32( 0, pStream->GetData(), aID.m_nSize );
+    aID.m_nChecksum     = vcl_get_checksum( 0, pStream->GetData(), aID.m_nSize );
     if( ! rMask.IsEmpty() )
         aID.m_nMaskChecksum = rMask.GetChecksum();
 
diff --git a/vcl/source/gdi/pdfwriter_impl.hxx b/vcl/source/gdi/pdfwriter_impl.hxx
index ccd8ada..cf38905 100644
--- a/vcl/source/gdi/pdfwriter_impl.hxx
+++ b/vcl/source/gdi/pdfwriter_impl.hxx
@@ -177,8 +177,8 @@ public:
     {
         Size        m_aPixelSize;
         sal_Int32   m_nSize;
-        sal_Int32   m_nChecksum;
-        sal_Int32   m_nMaskChecksum;
+        BitmapChecksum   m_nChecksum;
+        BitmapChecksum   m_nMaskChecksum;
 
         BitmapID() : m_nSize( 0 ), m_nChecksum( 0 ), m_nMaskChecksum( 0 ) {}
 
diff --git a/vcl/unx/gtk/app/gtkinst.cxx b/vcl/unx/gtk/app/gtkinst.cxx
index dcd9ff33..601fd21 100644
--- a/vcl/unx/gtk/app/gtkinst.cxx
+++ b/vcl/unx/gtk/app/gtkinst.cxx
@@ -341,7 +341,7 @@ SalBitmap* GtkInstance::CreateSalBitmap()
 {
     EnsureInit();
 #if GTK_CHECK_VERSION(3,0,0)
-    return new SvpSalBitmap();
+    return SvpSalInstance::CreateSalBitmap();//new SvpSalBitmap();
 #else
     return X11SalInstance::CreateSalBitmap();
 #endif


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