[Libreoffice-commits] core.git: include/svx svx/source vcl/source

Armin Le Grand alg at apache.org
Fri Sep 6 03:21:16 PDT 2013


 include/svx/svdundo.hxx               |    6 
 svx/source/svdraw/svdograf.cxx        |   43 +++++-
 svx/source/svdraw/svdundo.cxx         |   37 ++++-
 vcl/source/filter/jpeg/JpegReader.cxx |   36 ++++-
 vcl/source/gdi/pngread.cxx            |  241 +++++++++++++++++++++++++++-------
 5 files changed, 306 insertions(+), 57 deletions(-)

New commits:
commit c77ec4fe42c064adc507caa2760a99e096f8c016
Author: Armin Le Grand <alg at apache.org>
Date:   Thu Sep 5 13:01:45 2013 +0000

    Resolves: #i122985# Various speedups for graphic object swapping
    
    (cherry picked from commit f18ad6132d79540431bf04f090a7472e21a23e49)
    
    Conflicts:
    	svtools/source/filter/jpeg/jpeg.cxx
    	svx/inc/svx/svdundo.hxx
    	svx/source/svdraw/svdograf.cxx
    	vcl/source/gdi/pngread.cxx
    
    Change-Id: I733551fa9447eb8f45e9163a9c0189f013b03e82

diff --git a/include/svx/svdundo.hxx b/include/svx/svdundo.hxx
index d3a8a83..a3766b7 100644
--- a/include/svx/svdundo.hxx
+++ b/include/svx/svdundo.hxx
@@ -299,9 +299,11 @@ public:
 
 class SVX_DLLPUBLIC SdrUndoDelObj : public SdrUndoRemoveObj
 {
+private:
+    void TryToFlushGraphicContent();
+
 public:
-    SdrUndoDelObj(SdrObject& rNewObj, bool bOrdNumDirect = false)
-    :   SdrUndoRemoveObj(rNewObj,bOrdNumDirect) { SetOwner(sal_True); }
+    SdrUndoDelObj(SdrObject& rNewObj, bool bOrdNumDirect = false);
 
     virtual void Undo();
     virtual void Redo();
diff --git a/svx/source/svdraw/svdograf.cxx b/svx/source/svdraw/svdograf.cxx
index 277833fd..6adf75b 100644
--- a/svx/source/svdraw/svdograf.cxx
+++ b/svx/source/svdraw/svdograf.cxx
@@ -60,6 +60,7 @@
 #include <osl/thread.hxx>
 #include <drawinglayer/processor2d/objectinfoextractor2d.hxx>
 #include <drawinglayer/primitive2d/objectinfoprimitive2d.hxx>
+#include <officecfg/Office/Common.hxx>
 
 using namespace ::com::sun::star;
 using namespace ::com::sun::star::uno;
@@ -67,6 +68,40 @@ using namespace ::com::sun::star::io;
 
 #define SWAPGRAPHIC_TIMEOUT     5000
 
+// #i122985# it is not correct to set the swap-timeout to a hard-coded 5000ms as it was before.
+// Added code and experimented what to do as a good compromize, see description
+sal_uInt32 getCacheTimeInMs()
+{
+    static bool bSetAtAll(true);
+
+    if(bSetAtAll)
+    {
+        static bool bSetToPreferenceTime(true);
+
+        if(bSetToPreferenceTime)
+        {
+            const sal_uInt32 nSeconds =
+                officecfg::Office::Common::Cache::GraphicManager::ObjectReleaseTime::get(
+                    comphelper::getProcessComponentContext());
+
+
+            // the default is 10 minutes. The minimum is one minute, thus 60 seconds. When the minimum
+            // should match to the former hard-coded 5 seconds, we have a divisor of 12 to use. For the
+            // default of 10 minutes this would mean 50 seconds. Compared to before this is ten times
+            // more (would allow better navigation by switching through pages) and is controllable
+            // by the user by setting the tools/options/memory/Remove_from_memory_after setting. Seems
+            // to be a good compromize to me.
+            return nSeconds * 1000 / 12;
+        }
+        else
+        {
+            return SWAPGRAPHIC_TIMEOUT;
+        }
+    }
+
+    return 0;
+}
+
 const Graphic ImpLoadLinkedGraphic( const OUString aFileName, const OUString aFilterName )
 {
     Graphic aGraphic;
@@ -333,7 +368,7 @@ SdrGrafObj::SdrGrafObj()
 {
     pGraphic = new GraphicObject;
     mpReplacementGraphic = 0;
-    pGraphic->SetSwapStreamHdl( LINK( this, SdrGrafObj, ImpSwapHdl ), SWAPGRAPHIC_TIMEOUT );
+    pGraphic->SetSwapStreamHdl( LINK( this, SdrGrafObj, ImpSwapHdl ), getCacheTimeInMs() );
     onGraphicChanged();
 
     // #i118485# Shear allowed and possible now
@@ -357,7 +392,7 @@ SdrGrafObj::SdrGrafObj(const Graphic& rGrf, const Rectangle& rRect)
 {
     pGraphic = new GraphicObject( rGrf );
     mpReplacementGraphic = 0;
-    pGraphic->SetSwapStreamHdl( LINK( this, SdrGrafObj, ImpSwapHdl ), SWAPGRAPHIC_TIMEOUT );
+    pGraphic->SetSwapStreamHdl( LINK( this, SdrGrafObj, ImpSwapHdl ), getCacheTimeInMs() );
     onGraphicChanged();
 
     // #i118485# Shear allowed and possible now
@@ -381,7 +416,7 @@ SdrGrafObj::SdrGrafObj( const Graphic& rGrf )
 {
     pGraphic = new GraphicObject( rGrf );
     mpReplacementGraphic = 0;
-    pGraphic->SetSwapStreamHdl( LINK( this, SdrGrafObj, ImpSwapHdl ), SWAPGRAPHIC_TIMEOUT );
+    pGraphic->SetSwapStreamHdl( LINK( this, SdrGrafObj, ImpSwapHdl ), getCacheTimeInMs() );
     onGraphicChanged();
 
     // #i118485# Shear allowed and possible now
@@ -410,7 +445,7 @@ void SdrGrafObj::SetGraphicObject( const GraphicObject& rGrfObj )
     *pGraphic = rGrfObj;
     delete mpReplacementGraphic;
     mpReplacementGraphic = 0;
-    pGraphic->SetSwapStreamHdl( LINK( this, SdrGrafObj, ImpSwapHdl ), SWAPGRAPHIC_TIMEOUT );
+    pGraphic->SetSwapStreamHdl( LINK( this, SdrGrafObj, ImpSwapHdl ), getCacheTimeInMs() );
     pGraphic->SetUserData();
     mbIsPreview = false;
     SetChanged();
diff --git a/svx/source/svdraw/svdundo.cxx b/svx/source/svdraw/svdundo.cxx
index fcdf5f0..caf3ba4 100644
--- a/svx/source/svdraw/svdundo.cxx
+++ b/svx/source/svdraw/svdundo.cxx
@@ -38,8 +38,9 @@
 #include <svx/svdocapt.hxx>
 #include <svl/whiter.hxx>
 #include <svx/e3dsceneupdater.hxx>
-
-#include "svx/svdviter.hxx"
+#include <svx/svdviter.hxx>
+#include <svx/svdograf.hxx>
+#include <svx/sdr/contact/viewcontactofgraphic.hxx>
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
@@ -887,6 +888,34 @@ void SdrUndoInsertObj::Redo()
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
+void SdrUndoDelObj::TryToFlushGraphicContent()
+{
+    SdrGrafObj* pSdrGrafObj = dynamic_cast< SdrGrafObj* >(pObj);
+
+    if(pSdrGrafObj)
+    {
+        sdr::contact::ViewContactOfGraphic* pVC = dynamic_cast< sdr::contact::ViewContactOfGraphic* >(&pSdrGrafObj->GetViewContact());
+
+        if(pVC)
+        {
+            pVC->flushViewObjectContacts();
+            pVC->flushGraphicObjects();
+        }
+
+        pSdrGrafObj->ForceSwapOut();
+    }
+}
+
+SdrUndoDelObj::SdrUndoDelObj(SdrObject& rNewObj, bool bOrdNumDirect)
+:   SdrUndoRemoveObj(rNewObj,bOrdNumDirect)
+{
+    SetOwner(true);
+
+    // #i122985# if graphic object is deleted (but goes to undo) flush it's graphic content
+    // since it is potentially no longer needed
+    TryToFlushGraphicContent();
+}
+
 void SdrUndoDelObj::Undo()
 {
     SdrUndoRemoveObj::Undo();
@@ -899,6 +928,10 @@ void SdrUndoDelObj::Redo()
     SdrUndoRemoveObj::Redo();
     DBG_ASSERT(!IsOwner(),"RedoDeleteObj: pObj already belongs to UndoAction");
     SetOwner(sal_True);
+
+    // #i122985# if graphic object is deleted (but goes to undo) flush it's graphic content
+    // since it is potentially no longer needed
+    TryToFlushGraphicContent();
 }
 
 OUString SdrUndoDelObj::GetComment() const
diff --git a/vcl/source/filter/jpeg/JpegReader.cxx b/vcl/source/filter/jpeg/JpegReader.cxx
index 8b87aa6..a79f5ca 100644
--- a/vcl/source/filter/jpeg/JpegReader.cxx
+++ b/vcl/source/filter/jpeg/JpegReader.cxx
@@ -354,14 +354,38 @@ void JPEGReader::FillBitmap()
 
             for( long nY = 0L; nY < nHeight; nY++ )
             {
-                pTmp = (sal_uInt8*) mpBuffer + nY * nAlignedWidth;
+                // #i122985# Added fast-lane implementations using CopyScanline with direct supported mem formats
+                static bool bCheckOwnReader(true);
 
-                for( long nX = 0L; nX < nWidth; nX++ )
+                if(bCheckOwnReader)
+                {
+                    // #i122985# Trying to copy the RGB data from jpeg import to make things faster. Unfortunately
+                    // it has no GBR format, so RGB three-byte groups need to be 'flipped' to GBR first,
+                    // then CopyScanline can use a memcpy to do the data transport. CopyScanline can also
+                    // do the needed conversion from BMP_FORMAT_24BIT_TC_RGB (and it works well), but this
+                    // is not faster that the old loop below using SetPixel.
+                    sal_uInt8* aSource((sal_uInt8*)mpBuffer + nY * nAlignedWidth);
+                    sal_uInt8* aEnd(aSource + (nWidth * 3));
+
+                    for(sal_uInt8* aTmp(aSource); aTmp < aEnd; aTmp += 3)
+                    {
+                        ::std::swap(*aTmp, *(aTmp + 2));
+                    }
+
+                    mpAcc->CopyScanline(nY, aSource, BMP_FORMAT_24BIT_TC_BGR, nWidth * 3);
+                }
+                else
                 {
-                    aColor.SetRed(   *pTmp++ );
-                    aColor.SetGreen( *pTmp++ );
-                    aColor.SetBlue(  *pTmp++ );
-                    mpAcc->SetPixel( nY, nX, aColor );
+                    // old version: WritePixel
+                    pTmp = (sal_uInt8*) mpBuffer + nY * nAlignedWidth;
+
+                    for( long nX = 0L; nX < nWidth; nX++ )
+                    {
+                        aColor.SetRed( *pTmp++ );
+                        aColor.SetGreen( *pTmp++ );
+                        aColor.SetBlue( *pTmp++ );
+                        mpAcc->SetPixel( nY, nX, aColor );
+                    }
                 }
             }
         }
diff --git a/vcl/source/gdi/pngread.cxx b/vcl/source/gdi/pngread.cxx
index 71fb345..f8b4e95 100644
--- a/vcl/source/gdi/pngread.cxx
+++ b/vcl/source/gdi/pngread.cxx
@@ -123,6 +123,15 @@ private:
     bool                mbpHYs;         // true if pysical size of pixel available
     bool                mbIgnoreGammaChunk;
 
+#ifdef DBG_UTIL
+    // do some checks in debug mode
+    sal_uInt32          mnAllocSizeScanline;
+    sal_uInt32          mnAllocSizeScanlineAlpha;
+#endif
+    // the temporary Scanline (and alpha) for direct scanline copy to Bitmap
+    sal_uInt8*          mpScanline;
+    sal_uInt8*          mpScanlineAlpha;
+
     bool                ReadNextChunk();
     void                ReadRemainingChunks();
 
@@ -178,7 +187,13 @@ PNGReaderImpl::PNGReaderImpl( SvStream& rPNGStream )
     mbIDAT( false ),
     mbGamma             ( false ),
     mbpHYs              ( false ),
-    mbIgnoreGammaChunk  ( false )
+    mbIgnoreGammaChunk  ( false ),
+#ifdef DBG_UTIL
+    mnAllocSizeScanline(0),
+    mnAllocSizeScanlineAlpha(0),
+#endif
+    mpScanline(0),
+    mpScanlineAlpha(0)
 {
     // prepare the PNG data stream
     mnOrigStreamMode = mrPNGStream.GetNumberFormatInt();
@@ -222,6 +237,9 @@ PNGReaderImpl::~PNGReaderImpl()
     delete[] mpInflateInBuf;
     delete[] mpScanPrior;
     delete mpZCodec;
+
+    delete[] mpScanline;
+    delete[] mpScanlineAlpha;
 }
 
 bool PNGReaderImpl::ReadNextChunk()
@@ -1290,42 +1308,123 @@ void PNGReaderImpl::ImplDrawScanline( sal_uInt32 nXStart, sal_uInt32 nXAdd )
     }
     else // no palette => truecolor
     {
-        if( mbAlphaChannel ) // has RGB + alpha
-        {   // BMP_FORMAT_32BIT_TC_RGBA
+        // #i122985# Added fast-lane implementations using CopyScanline with direct supported mem formats
+        static bool bCkeckDirectScanline(true);
+
+        if( mbAlphaChannel )
+        {
+            // has RGB + alpha
             if ( mnPngDepth == 8 )  // maybe the source has 16 bit per sample
             {
-                if ( mpColorTable != mpDefaultColorTable )
+                // BMP_FORMAT_32BIT_TC_RGBA
+                // only use DirectScanline when we have no preview shifting stuff and accesses to content and alpha
+                const bool bDoDirectScanline(
+                    bCkeckDirectScanline && !nXStart && 1 == nXAdd && !mnPreviewShift && mpAcc && mpMaskAcc);
+                const bool bCustomColorTable(mpColorTable != mpDefaultColorTable);
+
+                if(bDoDirectScanline)
                 {
-                    for ( sal_Int32 nX = nXStart; nX < maOrigSize.Width(); nX += nXAdd, pTmp += 4 )
-                       ImplSetAlphaPixel( nY, nX, BitmapColor( mpColorTable[ pTmp[ 0 ] ],
-                                                               mpColorTable[ pTmp[ 1 ] ],
-                                                               mpColorTable[ pTmp[ 2 ] ] ), pTmp[ 3 ] );
+                    // allocate scanlines on demand, reused for next line
+                    if(!mpScanline)
+                    {
+#ifdef DBG_UTIL
+                        mnAllocSizeScanline = maOrigSize.Width() * 3;
+#endif
+                        mpScanline = new sal_uInt8[maOrigSize.Width() * 3];
+                    }
+
+                    if(!mpScanlineAlpha)
+                    {
+#ifdef DBG_UTIL
+                        mnAllocSizeScanlineAlpha = maOrigSize.Width();
+#endif
+                        mpScanlineAlpha = new sal_uInt8[maOrigSize.Width()];
+                    }
+                }
+
+                if(bDoDirectScanline)
+                {
+                    OSL_ENSURE(mpScanline, "No Scanline allocated (!)");
+                    OSL_ENSURE(mpScanlineAlpha, "No ScanlineAlpha allocated (!)");
+                    OSL_ENSURE(mnAllocSizeScanline >= maOrigSize.Width() * 3, "Allocated Scanline too small (!)");
+                    OSL_ENSURE(mnAllocSizeScanlineAlpha >= maOrigSize.Width(), "Allocated ScanlineAlpha too small (!)");
+                    sal_uInt8* pScanline(mpScanline);
+                    sal_uInt8* pScanlineAlpha(mpScanlineAlpha);
+
+                    for(sal_uInt32 nX(0); nX < maOrigSize.Width(); nX++, pTmp += 4)
+                    {
+                        // prepare content line as BGR by reordering when copying
+                        // do not forget to invert alpha (source is alpha, target is opacity)
+                        if(bCustomColorTable)
+                        {
+                            *pScanline++ = mpColorTable[pTmp[2]];
+                            *pScanline++ = mpColorTable[pTmp[1]];
+                            *pScanline++ = mpColorTable[pTmp[0]];
+                            *pScanlineAlpha++ = ~pTmp[3];
+                        }
+                        else
+                        {
+                            *pScanline++ = pTmp[2];
+                            *pScanline++ = pTmp[1];
+                            *pScanline++ = pTmp[0];
+                            *pScanlineAlpha++ = ~pTmp[3];
+                        }
+                    }
+
+                    // copy scanlines directly to bitmaps for content and alpha; use the formats which
+                    // are able to copy directly to BitmapBuffer
+                    mpAcc->CopyScanline(nY, mpScanline, BMP_FORMAT_24BIT_TC_BGR, maOrigSize.Width() * 3);
+                    mpMaskAcc->CopyScanline(nY, mpScanlineAlpha, BMP_FORMAT_8BIT_PAL, maOrigSize.Width());
                 }
                 else
                 {
-//                  if ( nXAdd == 1 && mnPreviewShift == 0 ) // copy raw line data if possible
-//                  {
-//                      int nLineBytes = 4 * maOrigSize.Width();
-//                      mpAcc->CopyScanline( nY, pTmp, BMP_FORMAT_32BIT_TC_RGBA, nLineBytes );
-//                      pTmp += nLineBytes;
-//                  }
-//                  else
+                    for ( sal_Int32 nX = nXStart; nX < maOrigSize.Width(); nX += nXAdd, pTmp += 4 )
                     {
-                        for ( sal_Int32 nX = nXStart; nX < maOrigSize.Width(); nX += nXAdd, pTmp += 4 )
-                            ImplSetAlphaPixel( nY, nX, BitmapColor( pTmp[0], pTmp[1], pTmp[2] ), pTmp[3] );
+                        if(bCustomColorTable)
+                        {
+                            ImplSetAlphaPixel(
+                                nY,
+                                nX,
+                                BitmapColor(
+                                    mpColorTable[ pTmp[ 0 ] ],
+                                    mpColorTable[ pTmp[ 1 ] ],
+                                    mpColorTable[ pTmp[ 2 ] ]),
+                                pTmp[ 3 ]);
+                        }
+                        else
+                        {
+                            ImplSetAlphaPixel(
+                                nY,
+                                nX,
+                                BitmapColor(
+                                    pTmp[0],
+                                    pTmp[1],
+                                    pTmp[2]),
+                                pTmp[3]);
+                        }
                     }
                 }
             }
             else
-            {   // BMP_FORMAT_64BIT_TC_RGBA
+            {
+                // BMP_FORMAT_64BIT_TC_RGBA
                 for ( sal_Int32 nX = nXStart; nX < maOrigSize.Width(); nX += nXAdd, pTmp += 8 )
-                    ImplSetAlphaPixel( nY, nX, BitmapColor( mpColorTable[ pTmp[ 0 ] ],
-                                                        mpColorTable[ pTmp[ 2 ] ],
-                                                        mpColorTable[ pTmp[ 4 ] ] ), pTmp[6] );
+                {
+                    ImplSetAlphaPixel(
+                        nY,
+                        nX,
+                        BitmapColor(
+                            mpColorTable[ pTmp[ 0 ] ],
+                            mpColorTable[ pTmp[ 2 ] ],
+                            mpColorTable[ pTmp[ 4 ] ]),
+                        pTmp[6]);
+                }
             }
         }
         else if( mbTransparent ) // has RGB + transparency
-        {   // BMP_FORMAT_24BIT_TC_RGB
+        {
+            // BMP_FORMAT_24BIT_TC_RGB
+            // no support currently for DirectScanline, found no real usages in current PNGs, may be added on demand
             if ( mnPngDepth == 8 )  // maybe the source has 16 bit per sample
             {
                 for ( sal_Int32 nX = nXStart; nX < maOrigSize.Width(); nX += nXAdd, pTmp += 3 )
@@ -1334,7 +1433,7 @@ void PNGReaderImpl::ImplDrawScanline( sal_uInt32 nXStart, sal_uInt32 nXAdd )
                     sal_uInt8 nGreen = pTmp[ 1 ];
                     sal_uInt8 nBlue = pTmp[ 2 ];
                     bool bTransparent = ( ( nRed == mnTransRed )
-                                         && ( nGreen == mnTransGreen )
+                                        && ( nGreen == mnTransGreen )
                                         && ( nBlue == mnTransBlue ) );
 
                     ImplSetTranspPixel( nY, nX, BitmapColor( mpColorTable[ nRed ],
@@ -1343,7 +1442,8 @@ void PNGReaderImpl::ImplDrawScanline( sal_uInt32 nXStart, sal_uInt32 nXAdd )
                 }
             }
             else
-            {   // BMP_FORMAT_48BIT_TC_RGB
+            {
+                // BMP_FORMAT_48BIT_TC_RGB
                 for ( sal_Int32 nX = nXStart; nX < maOrigSize.Width(); nX += nXAdd, pTmp += 6 )
                 {
                     sal_uInt8 nRed = pTmp[ 0 ];
@@ -1360,37 +1460,92 @@ void PNGReaderImpl::ImplDrawScanline( sal_uInt32 nXStart, sal_uInt32 nXAdd )
             }
         }
         else  // has RGB but neither alpha nor transparency
-        {   // BMP_FORMAT_24BIT_TC_RGB
+        {
+            // BMP_FORMAT_24BIT_TC_RGB
+            // only use DirectScanline when we have no preview shifting stuff and access to content
+            const bool bDoDirectScanline(
+                bCkeckDirectScanline && !nXStart && 1 == nXAdd && !mnPreviewShift && mpAcc);
+            const bool bCustomColorTable(mpColorTable != mpDefaultColorTable);
+
+            if(bDoDirectScanline && !mpScanline)
+            {
+                // allocate scanlines on demand, reused for next line
+#ifdef DBG_UTIL
+                mnAllocSizeScanline = maOrigSize.Width() * 3;
+#endif
+                mpScanline = new sal_uInt8[maOrigSize.Width() * 3];
+            }
+
             if ( mnPngDepth == 8 )   // maybe the source has 16 bit per sample
             {
-                if ( mpColorTable != mpDefaultColorTable )
+                if(bDoDirectScanline)
                 {
-                    for ( sal_Int32 nX = nXStart; nX < maOrigSize.Width(); nX += nXAdd, pTmp += 3 )
-                        ImplSetPixel( nY, nX, BitmapColor( mpColorTable[ pTmp[ 0 ] ],
-                                                            mpColorTable[ pTmp[ 1 ] ],
-                                                            mpColorTable[ pTmp[ 2 ] ] ) );
+                    OSL_ENSURE(mpScanline, "No Scanline allocated (!)");
+                    OSL_ENSURE(mnAllocSizeScanline >= maOrigSize.Width() * 3, "Allocated Scanline too small (!)");
+                    sal_uInt8* pScanline(mpScanline);
+
+                    for(sal_uInt32 nX(0); nX < maOrigSize.Width(); nX++, pTmp += 3)
+                    {
+                        // prepare content line as BGR by reordering when copying
+                        if(bCustomColorTable)
+                        {
+                            *pScanline++ = mpColorTable[pTmp[2]];
+                            *pScanline++ = mpColorTable[pTmp[1]];
+                            *pScanline++ = mpColorTable[pTmp[0]];
+                        }
+                        else
+                        {
+                            *pScanline++ = pTmp[2];
+                            *pScanline++ = pTmp[1];
+                            *pScanline++ = pTmp[0];
+                        }
+                    }
+
+                    // copy scanline directly to bitmap for content; use the format which is able to
+                    // copy directly to BitmapBuffer
+                    mpAcc->CopyScanline(nY, mpScanline, BMP_FORMAT_24BIT_TC_BGR, maOrigSize.Width() * 3);
                 }
                 else
                 {
-                    if( nXAdd == 1 && mnPreviewShift == 0 ) // copy raw line data if possible
-                    {
-                        int nLineBytes = maOrigSize.Width() * 3;
-                        mpAcc->CopyScanline( nY, pTmp, BMP_FORMAT_24BIT_TC_RGB, nLineBytes );
-                        pTmp += nLineBytes;
-                    }
-                    else
+                    for ( sal_Int32 nX = nXStart; nX < maOrigSize.Width(); nX += nXAdd, pTmp += 3 )
                     {
-                        for ( sal_Int32 nX = nXStart; nX < maOrigSize.Width(); nX += nXAdd, pTmp += 3 )
-                            ImplSetPixel( nY, nX, BitmapColor( pTmp[0], pTmp[1], pTmp[2] ) );
+                        if(bCustomColorTable)
+                        {
+                            ImplSetPixel(
+                                nY,
+                                nX,
+                                BitmapColor(
+                                    mpColorTable[ pTmp[ 0 ] ],
+                                    mpColorTable[ pTmp[ 1 ] ],
+                                    mpColorTable[ pTmp[ 2 ] ]));
+                        }
+                        else
+                        {
+                            ImplSetPixel(
+                                nY,
+                                nX,
+                                BitmapColor(
+                                    pTmp[0],
+                                    pTmp[1],
+                                    pTmp[2]));
+                        }
                     }
                 }
             }
             else
-            {   // BMP_FORMAT_48BIT_TC_RGB
+            {
+                // BMP_FORMAT_48BIT_TC_RGB
+                // no support currently for DirectScanline, found no real usages in current PNGs, may be added on demand
                 for ( sal_Int32 nX = nXStart; nX < maOrigSize.Width(); nX += nXAdd, pTmp += 6 )
-                    ImplSetPixel( nY, nX, BitmapColor( mpColorTable[ pTmp[ 0 ] ],
-                                                        mpColorTable[ pTmp[ 2 ] ],
-                                                        mpColorTable[ pTmp[ 4 ] ] ) );
+                {
+                    ImplSetPixel(
+                        nY,
+                        nX,
+                        BitmapColor(
+                            mpColorTable[ pTmp[ 0 ] ],
+                            mpColorTable[ pTmp[ 2 ] ],
+                            mpColorTable[ pTmp[ 4 ] ]));
+                }
             }
         }
     }


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