sc/source/core/data/column2.cxx     |   17 +++++++++++------
 sc/source/core/data/documen9.cxx    |    5 +++--
 sc/source/core/data/global.cxx      |    5 +++--
 sc/source/core/data/stlsheet.cxx    |    7 ++++---
 sc/source/core/data/table1.cxx      |    5 +++--
 sc/source/core/data/table2.cxx      |   13 ++++++++-----
 sc/source/core/tool/detfunc.cxx     |    5 +++--
 sc/source/filter/excel/xechart.cxx  |    4 ++--
 sc/source/filter/excel/xeescher.cxx |   10 +---------
 sc/source/filter/excel/xichart.cxx  |    5 +++--
 sc/source/filter/excel/xlescher.cxx |   28 +++++++++-------------------
 sc/source/filter/excel/xlpage.cxx   |    7 ++++---
 sc/source/filter/excel/xlstyle.cxx  |    5 +++--
 sc/source/filter/excel/xltools.cxx  |   16 +++++++++-------
 sc/source/filter/html/htmlexp.cxx   |    3 ++-
 sc/source/filter/inc/xlconst.hxx    |    5 -----
 sc/source/filter/rtf/eeimpars.cxx   |    5 +++--
 17 files changed, 71 insertions(+), 74 deletions(-)

New commits:
commit cdc67f6da362cea008a780abe412403eae64d04c
Author:     Mike Kaganski <mike.kagan...@collabora.com>
AuthorDate: Sun Feb 21 11:10:22 2021 +0300
Commit:     Mike Kaganski <mike.kagan...@collabora.com>
CommitDate: Sun Feb 21 10:02:46 2021 +0100

    Some more unit conversion unification
    
    Change-Id: I1a906d918bb4255a75c62c68a57244f59d51d2b1
    Reviewed-on: https://gerrit.libreoffice.org/c/core/+/111269
    Tested-by: Jenkins
    Reviewed-by: Mike Kaganski <mike.kagan...@collabora.com>

diff --git a/sc/source/core/data/column2.cxx b/sc/source/core/data/column2.cxx
index d194ab134dd1..e6430758cc6f 100644
--- a/sc/source/core/data/column2.cxx
+++ b/sc/source/core/data/column2.cxx
@@ -44,6 +44,7 @@
 
 #include <editeng/eeitem.hxx>
 #include <o3tl/safeint.hxx>
+#include <o3tl/unit_conversion.hxx>
 #include <svx/algitem.hxx>
 #include <editeng/editobj.hxx>
 #include <editeng/editstat.hxx>
@@ -420,7 +421,7 @@ tools::Long ScColumn::GetNeededSize(
                 //  to ensure the exact same paper width (and same line 
breaks) as in
                 //  ScEditUtil::GetEditArea, used for output.
 
-                fWidthFactor = HMM_PER_TWIPS;
+                fWidthFactor = o3tl::convert(1.0, o3tl::Length::twip, 
o3tl::Length::mm100);
             }
 
             // use original width for hidden columns:
@@ -438,8 +439,9 @@ tools::Long ScColumn::GetNeededSize(
             // space for AutoFilter button:  20 * nZoom/100
             constexpr tools::Long nFilterButtonWidthPix = 20; // Autofilter 
pixel width at 100% zoom.
             if ( pFlag->HasAutoFilter() && !bTextWysiwyg )
-                nDocWidth -= bInPrintTwips ?
-                        (nFilterButtonWidthPix * TWIPS_PER_PIXEL) : 
tools::Long(rZoomX * nFilterButtonWidthPix);
+                nDocWidth -= bInPrintTwips ? 
o3tl::convert(nFilterButtonWidthPix, o3tl::Length::px,
+                                                           o3tl::Length::twip)
+                                           : tools::Long(rZoomX * 
nFilterButtonWidthPix);
 
             aPaper.setWidth( nDocWidth );
 
@@ -572,7 +574,9 @@ tools::Long ScColumn::GetNeededSize(
                 {
                     //  add 1pt extra (default margin value) for line breaks 
with SetVertical
                     constexpr tools::Long nDefaultMarginInPoints = 1;
-                    nValue += conditionalScaleFunc(nDefaultMarginInPoints * 
TWIPS_PER_POINT, nPPT);
+                    nValue += conditionalScaleFunc(
+                        o3tl::convert(nDefaultMarginInPoints, 
o3tl::Length::pt, o3tl::Length::twip),
+                        nPPT);
                 }
             }
         }
@@ -594,8 +598,9 @@ tools::Long ScColumn::GetNeededSize(
         constexpr tools::Long nFilterButtonWidthPix = 20; // Autofilter pixel 
width at 100% zoom.
         ScMF nFlags = pPattern->GetItem(ATTR_MERGE_FLAG).GetValue();
         if (nFlags & ScMF::Auto)
-            nValue += bInPrintTwips ?
-                (nFilterButtonWidthPix * TWIPS_PER_PIXEL) : tools::Long(rZoomX 
* nFilterButtonWidthPix);
+            nValue += bInPrintTwips ? o3tl::convert(nFilterButtonWidthPix, 
o3tl::Length::px,
+                                                    o3tl::Length::twip)
+                                    : tools::Long(rZoomX * 
nFilterButtonWidthPix);
     }
 
     return nValue;
diff --git a/sc/source/core/data/documen9.cxx b/sc/source/core/data/documen9.cxx
index f44159d6c436..ff5eb488f858 100644
--- a/sc/source/core/data/documen9.cxx
+++ b/sc/source/core/data/documen9.cxx
@@ -23,6 +23,7 @@
 #include <editeng/autokernitem.hxx>
 #include <editeng/fontitem.hxx>
 #include <editeng/langitem.hxx>
+#include <o3tl/unit_conversion.hxx>
 #include <osl/thread.h>
 #include <svl/asiancfg.hxx>
 #include <svx/svditer.hxx>
@@ -456,8 +457,8 @@ bool ScDocument::IsPrintEmpty( SCTAB nTab, SCCOL nStartCol, 
SCROW nStartRow,
         for (i=nStartCol; i<=nEndCol; i++)
             nRight += GetColWidth(i,nTab);
 
-        aMMRect.SetLeft( static_cast<tools::Long>(nLeft  * HMM_PER_TWIPS) );
-        aMMRect.SetRight( static_cast<tools::Long>(nRight * HMM_PER_TWIPS) );
+        aMMRect.SetLeft(o3tl::convert(nLeft, o3tl::Length::twip, 
o3tl::Length::mm100));
+        aMMRect.SetRight(o3tl::convert(nRight, o3tl::Length::twip, 
o3tl::Length::mm100));
     }
     else
         aMMRect = GetMMRect( nStartCol, nStartRow, nEndCol, nEndRow, nTab );
diff --git a/sc/source/core/data/global.cxx b/sc/source/core/data/global.cxx
index 458e81da5188..e47303bf7cab 100644
--- a/sc/source/core/data/global.cxx
+++ b/sc/source/core/data/global.cxx
@@ -23,6 +23,7 @@
 #include <editeng/editobj.hxx>
 #include <svl/srchitem.hxx>
 #include <editeng/langitem.hxx>
+#include <o3tl/unit_conversion.hxx>
 #include <sfx2/docfile.hxx>
 #include <sfx2/dispatch.hxx>
 #include <sfx2/objsh.hxx>
@@ -461,8 +462,8 @@ void ScGlobal::InitPPT()
     if (comphelper::LibreOfficeKit::isActive())
     {
         // LOK: the below limited precision is not enough for RowColumnHeader.
-        nScreenPPTX = double(pDev->GetDPIX()) / double(TWIPS_PER_INCH);
-        nScreenPPTY = double(pDev->GetDPIY()) / double(TWIPS_PER_INCH);
+        nScreenPPTX = o3tl::convert<double>(pDev->GetDPIX(), 
o3tl::Length::twip, o3tl::Length::in);
+        nScreenPPTY = o3tl::convert<double>(pDev->GetDPIY(), 
o3tl::Length::twip, o3tl::Length::in);
     }
     else
     {
diff --git a/sc/source/core/data/stlsheet.cxx b/sc/source/core/data/stlsheet.cxx
index 13acfa8e9e56..20f4399dd98b 100644
--- a/sc/source/core/data/stlsheet.cxx
+++ b/sc/source/core/data/stlsheet.cxx
@@ -34,14 +34,15 @@
 #include <svl/itempool.hxx>
 #include <svl/itemset.hxx>
 #include <svl/hint.hxx>
+#include <o3tl/unit_conversion.hxx>
 #include <attrib.hxx>
 
 #include <globstr.hrc>
 #include <scresid.hxx>
 #include <sc.hrc>
 
-#define TWO_CM      1134
-#define HFDIST_CM   142
+constexpr auto TWO_CM = o3tl::convert(2, o3tl::Length::cm, 
o3tl::Length::twip); // 1134
+constexpr auto HFDIST_CM = o3tl::convert(250, o3tl::Length::mm100, 
o3tl::Length::twip); // 142
 
 ScStyleSheet::ScStyleSheet( const OUString&     rName,
                             const ScStyleSheetPool& rPoolP,
@@ -163,7 +164,7 @@ SfxItemSet& ScStyleSheet::GetItemSet()
                         SfxItemSet&     rHFSet = aHFSetItem.GetItemSet();
                         SvxSizeItem     aHFSizeItem( // 0,5 cm + distance
                                             ATTR_PAGE_SIZE,
-                                            Size( 0, tools::Long( 500 / 
HMM_PER_TWIPS ) + HFDIST_CM ) );
+                                            Size( 0, o3tl::convert(500, 
o3tl::Length::mm100, o3tl::Length::twip) + HFDIST_CM ) );
 
                         SvxULSpaceItem  aHFDistItem ( HFDIST_CM,// nUp
                                                       HFDIST_CM,// nLow
diff --git a/sc/source/core/data/table1.cxx b/sc/source/core/data/table1.cxx
index af09507b5c20..459f804984ed 100644
--- a/sc/source/core/data/table1.cxx
+++ b/sc/source/core/data/table1.cxx
@@ -20,6 +20,7 @@
 #include <scitems.hxx>
 #include <editeng/justifyitem.hxx>
 #include <o3tl/safeint.hxx>
+#include <o3tl/unit_conversion.hxx>
 #include <unotools/textsearch.hxx>
 #include <unotools/charclass.hxx>
 
@@ -302,8 +303,8 @@ ScTable::ScTable( ScDocument& rDoc, SCTAB nNewTab, const 
OUString& rNewName,
         if ( pDrawLayer->ScAddPage( nTab ) )    // sal_False (not inserted) 
during Undo
         {
             pDrawLayer->ScRenamePage( nTab, aName );
-            sal_uLong const nx = sal_uLong(double(rDocument.MaxCol()+1) * 
STD_COL_WIDTH           * HMM_PER_TWIPS );
-            sal_uLong ny = static_cast<sal_uLong>(double(rDocument.MaxRow()+1) 
* ScGlobal::nStdRowHeight * HMM_PER_TWIPS );
+            sal_uLong const nx = o3tl::convert((rDocument.MaxCol()+1) * 
STD_COL_WIDTH, o3tl::Length::twip, o3tl::Length::mm100);
+            sal_uLong ny = o3tl::convert((rDocument.MaxRow()+1) * 
ScGlobal::nStdRowHeight, o3tl::Length::twip, o3tl::Length::mm10);
             pDrawLayer->SetPageSize( static_cast<sal_uInt16>(nTab), Size( nx, 
ny ), false );
         }
     }
diff --git a/sc/source/core/data/table2.cxx b/sc/source/core/data/table2.cxx
index d25e7ce7c7f4..833b4edd13f7 100644
--- a/sc/source/core/data/table2.cxx
+++ b/sc/source/core/data/table2.cxx
@@ -58,6 +58,7 @@
 #include <editeng/boxitem.hxx>
 #include <editeng/editobj.hxx>
 #include <o3tl/safeint.hxx>
+#include <o3tl/unit_conversion.hxx>
 #include <svl/poolcach.hxx>
 #include <unotools/charclass.hxx>
 #include <math.h>
@@ -3916,13 +3917,15 @@ void ScTable::SetDrawPageSize(bool bResetStreamValid, 
bool bUpdateNoteCaptionPos
     ScDrawLayer* pDrawLayer = rDocument.GetDrawLayer();
     if( pDrawLayer )
     {
-        double fValX = GetColOffset( rDocument.MaxCol() + 1 ) * HMM_PER_TWIPS;
-        double fValY = GetRowOffset( rDocument.MaxRow() + 1 ) * HMM_PER_TWIPS;
-        const tools::Long nMax = ::std::numeric_limits<tools::Long>::max();
+        const sal_Int64 nMax = ::std::numeric_limits<tools::Long>::max();
         // #i113884# Avoid int32 overflow with possible negative results than 
can cause bad effects.
         // If the draw page size is smaller than all rows, only the bottom of 
the sheet is affected.
-        tools::Long x = ( fValX > static_cast<double>(nMax) ) ? nMax : 
static_cast<tools::Long>(fValX);
-        tools::Long y = ( fValY > static_cast<double>(nMax) ) ? nMax : 
static_cast<tools::Long>(fValY);
+        tools::Long x = std::min(o3tl::convert(GetColOffset(rDocument.MaxCol() 
+ 1),
+                                               o3tl::Length::twip, 
o3tl::Length::mm100),
+                                 nMax);
+        tools::Long y = std::min(o3tl::convert(GetRowOffset(rDocument.MaxRow() 
+ 1),
+                                               o3tl::Length::twip, 
o3tl::Length::mm100),
+                                 nMax);
 
         if ( IsLayoutRTL() )        // IsNegativePage
             x = -x;
diff --git a/sc/source/core/tool/detfunc.cxx b/sc/source/core/tool/detfunc.cxx
index f2d8f8254d20..2b525e8c0891 100644
--- a/sc/source/core/tool/detfunc.cxx
+++ b/sc/source/core/tool/detfunc.cxx
@@ -21,6 +21,7 @@
 #include <svtools/colorcfg.hxx>
 #include <editeng/eeitem.hxx>
 #include <formula/errorcodes.hxx>
+#include <o3tl/unit_conversion.hxx>
 #include <svx/sdshitm.hxx>
 #include <svx/sdsxyitm.hxx>
 #include <svx/sdtditm.hxx>
@@ -328,8 +329,8 @@ Point ScDetectiveFunc::GetDrawPos( SCCOL nCol, SCROW nRow, 
DrawPosMode eMode ) c
         aPos.AdjustX(rDoc.GetColWidth( i, nTab ) );
     aPos.AdjustY(rDoc.GetRowHeight( 0, nRow - 1, nTab ) );
 
-    aPos.setX( static_cast< tools::Long >( aPos.X() * HMM_PER_TWIPS ) );
-    aPos.setY( static_cast< tools::Long >( aPos.Y() * HMM_PER_TWIPS ) );
+    aPos.setX(o3tl::convert(aPos.X(), o3tl::Length::twip, 
o3tl::Length::mm100));
+    aPos.setY(o3tl::convert(aPos.Y(), o3tl::Length::twip, 
o3tl::Length::mm100));
 
     if ( rDoc.IsNegativePage( nTab ) )
         aPos.setX( aPos.X() * -1 );
diff --git a/sc/source/filter/excel/xechart.cxx 
b/sc/source/filter/excel/xechart.cxx
index 0b1f109f665c..ad829a913f31 100644
--- a/sc/source/filter/excel/xechart.cxx
+++ b/sc/source/filter/excel/xechart.cxx
@@ -2302,8 +2302,8 @@ void XclExpChLegend::Convert( const ScfPropertySet& 
rPropSet )
             // legend size, Excel expects points in CHFRAMEPOS record
             rFramePos.mnBRMode = EXC_CHFRAMEPOS_ABSSIZE_POINTS;
             css::awt::Size aLegendSize = xChart1Legend->getSize();
-            rFramePos.maRect.mnWidth = static_cast< sal_uInt16 >( 
aLegendSize.Width * EXC_POINTS_PER_HMM + 0.5 );
-            rFramePos.maRect.mnHeight = static_cast< sal_uInt16 >( 
aLegendSize.Height * EXC_POINTS_PER_HMM + 0.5 );
+            rFramePos.maRect.mnWidth = o3tl::convert(aLegendSize.Width, 
o3tl::Length::mm100, o3tl::Length::pt);
+            rFramePos.maRect.mnHeight = o3tl::convert(aLegendSize.Height, 
o3tl::Length::mm100, o3tl::Length::pt);
             maData.maRect.mnWidth = CalcChartXFromHmm( aLegendSize.Width );
             maData.maRect.mnHeight = CalcChartYFromHmm( aLegendSize.Height );
             eApiExpand = cssc::ChartLegendExpansion_CUSTOM;
diff --git a/sc/source/filter/excel/xeescher.cxx 
b/sc/source/filter/excel/xeescher.cxx
index 68cf336c88a8..eea83fbeaf70 100644
--- a/sc/source/filter/excel/xeescher.cxx
+++ b/sc/source/filter/excel/xeescher.cxx
@@ -94,11 +94,6 @@ using namespace oox;
 namespace
 {
 
-tools::Long lcl_hmm2px(tools::Long nPixel)
-{
-    return static_cast<tools::Long>(nPixel*PIXEL_PER_INCH/1000.0/CM_PER_INCH + 
0.5);
-}
-
 const char *ToHorizAlign( SdrTextHorzAdjust eAdjust )
 {
     switch( eAdjust )
@@ -149,10 +144,7 @@ void lcl_WriteAnchorVertex( sax_fastparser::FSHelperPtr 
const & rComments, const
 
 tools::Long lcl_hmm2output(tools::Long value, bool bInEMU)
 {
-    if (bInEMU)
-        return oox::drawingml::convertHmmToEmu(value);
-    else
-        return lcl_hmm2px(value);
+    return o3tl::convert(value, o3tl::Length::mm100, bInEMU ? 
o3tl::Length::emu : o3tl::Length::px);
 }
 
 void lcl_GetFromTo( const XclExpRoot& rRoot, const tools::Rectangle &aRect, 
sal_Int32 nTab, tools::Rectangle &aFrom, tools::Rectangle &aTo, bool bInEMU = 
false )
diff --git a/sc/source/filter/excel/xichart.cxx 
b/sc/source/filter/excel/xichart.cxx
index 55c13e592cd4..befd63b3414c 100644
--- a/sc/source/filter/excel/xichart.cxx
+++ b/sc/source/filter/excel/xichart.cxx
@@ -76,6 +76,7 @@
 #include <com/sun/star/chart2/data/LabeledDataSequence.hpp>
 #include <comphelper/processfactory.hxx>
 #include <o3tl/numeric.hxx>
+#include <o3tl/unit_conversion.hxx>
 #include <sfx2/objsh.hxx>
 #include <svx/svdpage.hxx>
 #include <svx/unoapi.hxx>
@@ -2625,8 +2626,8 @@ Reference< XLegend > XclImpChLegend::CreateLegend() const
                 (pFramePos->maRect.mnWidth > 0) && (pFramePos->maRect.mnHeight 
> 0) )
             {
                 eApiExpand = cssc::ChartLegendExpansion_CUSTOM;
-                sal_Int32 nWidthHmm = static_cast< sal_Int32 >( 
pFramePos->maRect.mnWidth / EXC_POINTS_PER_HMM );
-                sal_Int32 nHeightHmm = static_cast< sal_Int32 >( 
pFramePos->maRect.mnHeight / EXC_POINTS_PER_HMM );
+                sal_Int32 nWidthHmm = o3tl::convert(pFramePos->maRect.mnWidth, 
o3tl::Length::pt, o3tl::Length::mm100);
+                sal_Int32 nHeightHmm = 
o3tl::convert(pFramePos->maRect.mnHeight, o3tl::Length::pt, 
o3tl::Length::mm100);
                 RelativeSize aRelSize( CalcRelativeFromHmmX( nWidthHmm ), 
CalcRelativeFromHmmY( nHeightHmm ) );
                 aLegendProp.SetProperty( EXC_CHPROP_RELATIVESIZE, aRelSize );
             }
diff --git a/sc/source/filter/excel/xlescher.cxx 
b/sc/source/filter/excel/xlescher.cxx
index bb59b851a9a8..8ae663cdda7c 100644
--- a/sc/source/filter/excel/xlescher.cxx
+++ b/sc/source/filter/excel/xlescher.cxx
@@ -25,6 +25,7 @@
 
 #include <com/sun/star/drawing/XControlShape.hpp>
 #include <com/sun/star/script/ScriptEventDescriptor.hpp>
+#include <tools/UnitConversion.hxx>
 #include <document.hxx>
 #include <xistream.hxx>
 #include <xlroot.hxx>
@@ -42,20 +43,11 @@ namespace {
 /** Returns the scaling factor to calculate coordinates from twips. */
 double lclGetTwipsScale( MapUnit eMapUnit )
 {
-    /*  We cannot use OutputDevice::LogicToLogic() or the XclTools
-        conversion functions to calculate drawing layer coordinates due to
-        Calc's strange definition of a point (1 inch == 72.27 points, instead
-        of 72 points).
-        NOTE: Calc's definition changed from TeX points (72.27) to PS points
-        (72), so the MapUnit::MapTwip case now actually also delivers a scale 
of 1.0
-    */
     double fScale = 1.0;
-    switch( eMapUnit )
-    {
-        case MapUnit::MapTwip:      fScale = 1;               break;  // Calc 
twips <-> real twips
-        case MapUnit::Map100thMM:  fScale = HMM_PER_TWIPS;   break;  // Calc 
twips <-> 1/100mm
-        default:            OSL_FAIL( "lclGetTwipsScale - map unit not 
implemented" );
-    }
+    if (const auto eTo = MapToO3tlLength(eMapUnit); eTo != 
o3tl::Length::invalid)
+        fScale = o3tl::convert(1.0, o3tl::Length::twip, eTo);
+    else
+        OSL_FAIL("lclGetTwipsScale - map unit not implemented");
     return fScale;
 }
 
@@ -183,12 +175,10 @@ void XclObjAnchor::SetRect( const Size& rPageSize, 
sal_Int32 nScaleX, sal_Int32
         const tools::Rectangle& rRect, MapUnit eMapUnit )
 {
     double fScale = 1.0;
-    switch( eMapUnit )
-    {
-        case MapUnit::MapTwip:      fScale = HMM_PER_TWIPS; break;  // Calc 
twips -> 1/100mm
-        case MapUnit::Map100thMM:  fScale = 1.0;           break;  // Calc 
1/100mm -> 1/100mm
-        default:            OSL_FAIL( "XclObjAnchor::SetRect - map unit not 
implemented" );
-    }
+    if (const auto eFrom = MapToO3tlLength(eMapUnit); eFrom != 
o3tl::Length::invalid)
+        fScale = o3tl::convert(1.0, eFrom, o3tl::Length::mm100);
+    else
+        OSL_FAIL("XclObjAnchor::SetRect - map unit not implemented");
 
     /*  In objects with DFF client anchor, the position of the shape is stored
         in the cell address components of the client anchor. In old BIFF3-BIFF5
diff --git a/sc/source/filter/excel/xlpage.cxx 
b/sc/source/filter/excel/xlpage.cxx
index 6186266fafb0..ef1742dd51e3 100644
--- a/sc/source/filter/excel/xlpage.cxx
+++ b/sc/source/filter/excel/xlpage.cxx
@@ -20,6 +20,7 @@
 #include <xlpage.hxx>
 #include <xltools.hxx>
 #include <editeng/paperinf.hxx>
+#include <o3tl/unit_conversion.hxx>
 #include <sal/macros.h>
 #include <editeng/brushitem.hxx>
 #include <global.hxx>
@@ -36,15 +37,15 @@ struct XclPaperSize
 
 constexpr tools::Long in2twips(double n_inch)
 {
-    return static_cast<tools::Long>( (n_inch * EXC_TWIPS_PER_INCH) + 0.5);
+    return o3tl::convert(n_inch, o3tl::Length::in, o3tl::Length::twip) + 0.5;
 }
 constexpr tools::Long mm2twips(double n_mm)
 {
-    return static_cast<tools::Long>( (n_mm * EXC_TWIPS_PER_INCH / CM_PER_INCH 
/ 10.0) + 0.5);
+    return o3tl::convert(n_mm, o3tl::Length::mm, o3tl::Length::twip) + 0.5;
 }
 constexpr tools::Long twips2mm(tools::Long n_twips)
 {
-    return static_cast<tools::Long>((static_cast<double>(n_twips) - 0.5) / 
EXC_TWIPS_PER_INCH * CM_PER_INCH * 10.0);
+    return o3tl::convert(n_twips, o3tl::Length::twip, o3tl::Length::mm);
 }
 
 // see ApiPaperSize spPaperSizeTable in filter and aDinTab in i18nutil
diff --git a/sc/source/filter/excel/xlstyle.cxx 
b/sc/source/filter/excel/xlstyle.cxx
index 0cc23ed90bfb..84d146c922fb 100644
--- a/sc/source/filter/excel/xlstyle.cxx
+++ b/sc/source/filter/excel/xlstyle.cxx
@@ -32,6 +32,7 @@
 #include <svtools/colorcfg.hxx>
 #include <vcl/unohelp.hxx>
 #include <editeng/svxfont.hxx>
+#include <o3tl/unit_conversion.hxx>
 #include <global.hxx>
 #include <xlroot.hxx>
 #include <xltools.hxx>
@@ -389,7 +390,7 @@ void XclFontData::SetScStrikeout( FontStrikeout 
eScStrikeout )
 
 float XclFontData::GetApiHeight() const
 {
-    return static_cast< float >( mnHeight / TWIPS_PER_POINT );
+    return o3tl::convert<double>(mnHeight, o3tl::Length::twip, 
o3tl::Length::pt);
 }
 
 sal_Int16 XclFontData::GetApiFamily() const
@@ -454,7 +455,7 @@ sal_Int16 XclFontData::GetApiStrikeout() const
 
 void XclFontData::SetApiHeight( float fPoint )
 {
-    mnHeight = static_cast< sal_uInt16 >( ::std::min( fPoint * TWIPS_PER_POINT 
+ 0.5, 32767.0 ) );
+    mnHeight = std::min(o3tl::convert(fPoint, o3tl::Length::pt, 
o3tl::Length::twip) + 0.5, 32767.0);
 }
 
 void XclFontData::SetApiFamily( sal_Int16 nApiFamily )
diff --git a/sc/source/filter/excel/xltools.cxx 
b/sc/source/filter/excel/xltools.cxx
index e4ffbebce44b..82c5c0449b25 100644
--- a/sc/source/filter/excel/xltools.cxx
+++ b/sc/source/filter/excel/xltools.cxx
@@ -21,6 +21,7 @@
 #include <math.h>
 #include <string_view>
 
+#include <o3tl/unit_conversion.hxx>
 #include <sal/mathconf.h>
 #include <sal/macros.h>
 #include <sal/log.hxx>
@@ -271,35 +272,36 @@ XclBoolError XclTools::ErrorToEnum( double& rfDblValue, 
bool bErrOrBool, sal_uIn
     return eType;
 }
 
+template <typename N> static N to(double f) { return limit_cast<N>(f + 0.5); }
+
 sal_uInt16 XclTools::GetTwipsFromInch( double fInches )
 {
-    return static_cast< sal_uInt16 >(
-        ::std::clamp( fInches * EXC_TWIPS_PER_INCH + 0.5, 0.0, 65535.0 ) );
+    return to<sal_uInt16>(o3tl::convert(fInches, o3tl::Length::in, 
o3tl::Length::twip));
 }
 
 sal_uInt16 XclTools::GetTwipsFromHmm( sal_Int32 nHmm )
 {
-    return GetTwipsFromInch( static_cast< double >( nHmm ) / 1000.0 / 
CM_PER_INCH );
+    return limit_cast<sal_uInt16>(o3tl::convert(nHmm, o3tl::Length::mm100, 
o3tl::Length::twip));
 }
 
 double XclTools::GetInchFromTwips( sal_Int32 nTwips )
 {
-    return static_cast< double >( nTwips ) / EXC_TWIPS_PER_INCH;
+    return o3tl::convert<double>(nTwips, o3tl::Length::twip, o3tl::Length::in);
 }
 
 double XclTools::GetInchFromHmm( sal_Int32 nHmm )
 {
-    return GetInchFromTwips( GetTwipsFromHmm( nHmm ) );
+    return o3tl::convert<double>(nHmm, o3tl::Length::mm100, o3tl::Length::in);
 }
 
 sal_Int32 XclTools::GetHmmFromInch( double fInches )
 {
-    return static_cast< sal_Int32 >( fInches * CM_PER_INCH * 1000 );
+    return to<sal_Int32>(o3tl::convert(fInches, o3tl::Length::in, 
o3tl::Length::mm100));
 }
 
 sal_Int32 XclTools::GetHmmFromTwips( sal_Int32 nTwips )
 {
-    return GetHmmFromInch( GetInchFromTwips( nTwips ) );
+    return limit_cast<sal_Int32>(o3tl::convert(nTwips, o3tl::Length::twip, 
o3tl::Length::mm100));
 }
 
 sal_uInt16 XclTools::GetScColumnWidth( sal_uInt16 nXclWidth, tools::Long 
nScCharWidth )
diff --git a/sc/source/filter/html/htmlexp.cxx 
b/sc/source/filter/html/htmlexp.cxx
index b0402ada933a..5d527f6ca167 100644
--- a/sc/source/filter/html/htmlexp.cxx
+++ b/sc/source/filter/html/htmlexp.cxx
@@ -48,6 +48,7 @@
 #include <vcl/outdev.hxx>
 #include <stdio.h>
 #include <osl/diagnose.h>
+#include <o3tl/unit_conversion.hxx>
 
 #include <htmlexp.hxx>
 #include <global.hxx>
@@ -494,7 +495,7 @@ OString ScHTMLExport::BorderToStyle(const char* pBorderName,
         // thickness
         int nWidth = pLine->GetWidth();
         int nPxWidth = (nWidth > 0) ?
-            std::max(int(nWidth / TWIPS_PER_PIXEL), 1) : 0;
+            std::max(o3tl::convert(nWidth, o3tl::Length::twip, 
o3tl::Length::px), sal_Int64(1)) : 0;
         aOut.append(static_cast<sal_Int32>(nPxWidth)).
             append("px ");
         switch (pLine->GetBorderLineStyle())
diff --git a/sc/source/filter/inc/xlconst.hxx b/sc/source/filter/inc/xlconst.hxx
index 5a1c0dea585f..2338cf15417f 100644
--- a/sc/source/filter/inc/xlconst.hxx
+++ b/sc/source/filter/inc/xlconst.hxx
@@ -131,11 +131,6 @@ const sal_Int32 EXC_RK_INT100               = 
EXC_RK_100FLAG | EXC_RK_INTFLAG;
 
 // Measures -------------------------------------------------------------------
 
-const sal_Int32 EXC_POINTS_PER_INCH         = 72;
-const sal_Int32 EXC_TWIPS_PER_INCH          = EXC_POINTS_PER_INCH * 20;
-
-const double EXC_POINTS_PER_HMM             = static_cast< double >( 
EXC_POINTS_PER_INCH ) / 2540.0;
-
 const sal_uInt8 EXC_ORIENT_NONE             = 0;        /// Text orientation: 
not rotated.
 const sal_uInt8 EXC_ORIENT_STACKED          = 1;        /// Text orientation: 
vertically stacked.
 const sal_uInt8 EXC_ORIENT_90CCW            = 2;        /// Text orientation: 
90 deg counterclockwise.
diff --git a/sc/source/filter/rtf/eeimpars.cxx 
b/sc/source/filter/rtf/eeimpars.cxx
index be0ecc4dd829..db15c1560e10 100644
--- a/sc/source/filter/rtf/eeimpars.cxx
+++ b/sc/source/filter/rtf/eeimpars.cxx
@@ -24,6 +24,7 @@
 #include <editeng/editobj.hxx>
 #include <editeng/escapementitem.hxx>
 #include <editeng/langitem.hxx>
+#include <o3tl/unit_conversion.hxx>
 #include <svx/svdograf.hxx>
 #include <svx/svdpage.hxx>
 #include <svtools/htmlcfg.hxx>
@@ -556,8 +557,8 @@ void ScEEImport::InsertGraphic( SCCOL nCol, SCROW nRow, 
SCTAB nTab,
     OutputDevice* pDefaultDev = Application::GetDefaultDevice();
 
     Point aCellInsertPos(
-        static_cast<tools::Long>(static_cast<double>(mpDoc->GetColOffset( 
nCol, nTab )) * HMM_PER_TWIPS),
-        static_cast<tools::Long>(static_cast<double>(mpDoc->GetRowOffset( 
nRow, nTab )) * HMM_PER_TWIPS) );
+        o3tl::convert(mpDoc->GetColOffset(nCol, nTab), o3tl::Length::twip, 
o3tl::Length::mm100),
+        o3tl::convert(mpDoc->GetRowOffset(nRow, nTab), o3tl::Length::twip, 
o3tl::Length::mm100));
 
     Point aInsertPos( aCellInsertPos );
     Point aSpace;
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