reduce iteration in ScViewData::GetScrPos

we already have a ScTable::GetRowHeightScaled method that uses spans, so use
that.

Change-Id: I126292b4a8b37ebf2d4f737dcbfdadc31226531e
Reviewed-on: https://gerrit.libreoffice.org/82520
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

3 files changed, 37 insertions, 24 deletions

diff --git a/sc/source/core/data/document.cxx b/sc/source/core/data/document.cxx
index ec4a0e3e610a..4c550e670863 100644
--- a/sc/source/core/data/document.cxx
+++ b/sc/source/core/data/document.cxx
@@ -4183,7 +4183,7 @@ SCROW ScDocument::GetRowForHeight( SCTAB nTab, sal_uLong nHeight ) const
 }
 
 sal_uLong ScDocument::GetScaledRowHeight( SCROW nStartRow, SCROW nEndRow,
-        SCTAB nTab, double fScale ) const
+        SCTAB nTab, double fScale, const sal_uLong* pnMaxHeight ) const
 {
     // faster for a single row
     if (nStartRow == nEndRow)
@@ -4194,7 +4194,7 @@ sal_uLong ScDocument::GetScaledRowHeight( SCROW nStartRow, SCROW nEndRow,
         return 0;
 
     if ( ValidTab(nTab) && nTab < static_cast<SCTAB>(maTabs.size()) && maTabs[nTab] )
-        return maTabs[nTab]->GetScaledRowHeight( nStartRow, nEndRow, fScale);
+        return maTabs[nTab]->GetScaledRowHeight( nStartRow, nEndRow, fScale, pnMaxHeight );
 
     OSL_FAIL("wrong sheet number");
     return 0;
diff --git a/sc/source/core/data/table2.cxx b/sc/source/core/data/table2.cxx
index 4c36c7b63494..f1a0f37dcbbf 100644
--- a/sc/source/core/data/table2.cxx
+++ b/sc/source/core/data/table2.cxx
@@ -3243,7 +3243,7 @@ sal_uLong ScTable::GetRowHeight( SCROW nStartRow, SCROW nEndRow, bool bHiddenAsZ
         return (nEndRow - nStartRow + 1) * static_cast<sal_uLong>(ScGlobal::nStdRowHeight);
 }
 
-sal_uLong ScTable::GetScaledRowHeight( SCROW nStartRow, SCROW nEndRow, double fScale ) const
+sal_uLong ScTable::GetScaledRowHeight( SCROW nStartRow, SCROW nEndRow, double fScale, const sal_uLong* pnMaxHeight ) const
 {
     OSL_ENSURE(ValidRow(nStartRow) && ValidRow(nEndRow),"wrong row number");
 
@@ -3269,8 +3269,18 @@ sal_uLong ScTable::GetScaledRowHeight( SCROW nStartRow, SCROW nEndRow, double fS
                     SCROW nSegmentEnd = std::min( nLastRow, aData.mnRow2 );
 
                     // round-down a single height value, multiply resulting (pixel) values
-                    sal_uLong nOneHeight = static_cast<sal_uLong>( aData.mnValue * fScale );
-                    nHeight += nOneHeight * ( nSegmentEnd + 1 - nRow );
+                    const sal_uLong nOneHeight = static_cast<sal_uLong>( aData.mnValue * fScale );
+                    SCROW nRowsInSegment = nSegmentEnd + 1 - nRow;
+                    if (pnMaxHeight)
+                    {
+                        nRowsInSegment = std::min(nRowsInSegment, static_cast<SCROW>(*pnMaxHeight / nOneHeight + 1));
+                        nHeight += nOneHeight * nRowsInSegment;
+                        if (nHeight > *pnMaxHeight)
+                            return nHeight;
+                    }
+                    else
+                        nHeight += nOneHeight * nRowsInSegment;
+
 
                     nRow = nSegmentEnd + 1;
                 }
@@ -3280,7 +3290,17 @@ sal_uLong ScTable::GetScaledRowHeight( SCROW nStartRow, SCROW nEndRow, double fS
         return nHeight;
     }
     else
-        return static_cast<sal_uLong>((nEndRow - nStartRow + 1) * ScGlobal::nStdRowHeight * fScale);
+    {
+        const sal_uLong nOneHeight = static_cast<sal_uLong>(ScGlobal::nStdRowHeight * fScale);
+        SCROW nRowsInSegment = nEndRow - nStartRow + 1;
+        if (pnMaxHeight)
+        {
+            nRowsInSegment = std::min(nRowsInSegment, static_cast<SCROW>(*pnMaxHeight / nOneHeight + 1));
+            return nOneHeight * nRowsInSegment;
+        }
+        else
+            return static_cast<sal_uLong>(nRowsInSegment * nOneHeight);
+    }
 }
 
 sal_uInt16 ScTable::GetOriginalHeight( SCROW nRow ) const       // non-0 even if hidden
diff --git a/sc/source/ui/view/viewdata.cxx b/sc/source/ui/view/viewdata.cxx
index 0ea25ebce6de..7c4b719f2e33 100644
--- a/sc/source/ui/view/viewdata.cxx
+++ b/sc/source/ui/view/viewdata.cxx
@@ -2100,7 +2100,7 @@ Point ScViewData::GetScrPos( SCCOL nWhereX, SCROW nWhereY, ScSplitPos eWhich,
         const_cast<ScViewData*>(this)->aScrSize.setHeight( pView->GetGridHeight(eWhichY) );
     }
 
-    sal_uInt16 nTSize;
+    sal_uLong nTSize;
     bool bIsTiledRendering = comphelper::LibreOfficeKit::isActive();
 
 
@@ -2168,27 +2168,20 @@ Point ScViewData::GetScrPos( SCCOL nWhereX, SCROW nWhereY, ScSplitPos eWhich,
 
         if (nWhereY >= nStartPosY)
         {
-            for (SCROW nY = nStartPosY; nY < nWhereY && (bAllowNeg || bIsTiledRendering || nScrPosY <= aScrSize.Height()); nY++)
+            if (bAllowNeg || bIsTiledRendering || nScrPosY <= aScrSize.Height())
             {
-                if ( nY > pDoc->MaxRow() )
+                if ( nWhereY-1 > pDoc->MaxRow() )
                     nScrPosY = 0x7FFFFFFF;
+                else if (bAllowNeg || bIsTiledRendering)
+                {
+                    sal_uLong nSizeYPix = pDoc->GetScaledRowHeight( nStartPosY, nWhereY-1, nTabNo, nPPTY );
+                    nScrPosY += nSizeYPix;
+                }
                 else
                 {
-                    nTSize = pDoc->GetRowHeight( nY, nTabNo );
-                    if (nTSize)
-                    {
-                        long nSizeYPix = ToPixel( nTSize, nPPTY );
-                        nScrPosY += nSizeYPix;
-                    }
-                    else if ( nY < pDoc->MaxRow() )
-                    {
-                        // skip multiple hidden rows (forward only for now)
-                        SCROW nNext = pDoc->FirstVisibleRow(nY + 1, pDoc->MaxRow(), nTabNo);
-                        if ( nNext > pDoc->MaxRow() )
-                            nY = pDoc->MaxRow();
-                        else
-                            nY = nNext - 1;     // +=nDir advances to next visible row
-                    }
+                    sal_uLong nMaxHeight = aScrSize.getHeight() - nScrPosY;
+                    sal_uLong nSizeYPix = pDoc->GetScaledRowHeight( nStartPosY, nWhereY-1, nTabNo, nPPTY, &nMaxHeight );
+                    nScrPosY += nSizeYPix;
                 }
             }
         }