sc lok: emit RowColumnHeader info in twips

As that's the unit we use everywhere else in the LOK API. Also, make the
ScGlobal::nScreenPPTX/Y calculation more precise, otherwise rounding
errors occur during the pixel -> twip conversion.

Example with the old precision: col height is 103 px, nScreenPPTY is
0.067, twips is 1537.3134328358208, convering it back is 102.487562189
px.

Example with the new precision: col height is 103 px, nScreenPPTY is
0.0667, twips is 1544.2278860569716, convering it back is 102.948525737
px.

(cherry picked from commit 708d1c5a)

Conflicts:
	libreofficekit/qa/gtktiledviewer/gtktiledviewer.cxx

Change-Id: I19f5285508ef0c751614d07969b3a7a037e7d1ec

sc/source/core/data/global.cxx

@@ -544,9 +544,9 @@ void ScGlobal::UpdatePPT( OutputDevice* pDev )
 
         if ( !pDev )
             pDev = Application::GetDefaultDevice();
-        Point aPix1000 = pDev->LogicToPixel( Point(1000,1000), MAP_TWIP );
-        nScreenPPTX = aPix1000.X() / 1000.0;
-        nScreenPPTY = aPix1000.Y() / 1000.0;
+        Point aPix1000 = pDev->LogicToPixel( Point(10000,10000), MAP_TWIP );
+        nScreenPPTX = aPix1000.X() / 10000.0;
+        nScreenPPTY = aPix1000.Y() / 10000.0;
         nPPTZoom = nCurrentZoom;
     }
 }

sc/source/ui/view/tabview.cxx

@@ -2313,12 +2313,15 @@ OUString ScTabView::getRowColumnHeaders()
     SCROW nEndRow = 0;
     pDoc->GetTiledRenderingArea(aViewData.GetTabNo(), nEndCol, nEndRow);
 
+    double nPPTX = aViewData.GetPPTX();
+    double nPPTY = aViewData.GetPPTY();
+
     boost::property_tree::ptree aRows;
     for (SCROW nRow = 0; nRow <= nEndRow; ++nRow)
     {
         boost::property_tree::ptree aRow;
         sal_uInt16 nSize = pRowBar[SC_SPLIT_BOTTOM]->GetEntrySize(nRow);
-        aRow.put("size", OString::number(nSize).getStr());
+        aRow.put("size", OString::number(nSize / nPPTY).getStr());
         OUString aText = pRowBar[SC_SPLIT_BOTTOM]->GetEntryText(nRow);
         aRow.put("text", aText.toUtf8().getStr());
         aRows.push_back(std::make_pair("", aRow));
@@ -2329,7 +2332,7 @@ OUString ScTabView::getRowColumnHeaders()
     {
         boost::property_tree::ptree aCol;
         sal_uInt16 nSize = pColBar[SC_SPLIT_LEFT]->GetEntrySize(nCol);
-        aCol.put("size", OString::number(nSize).getStr());
+        aCol.put("size", OString::number(nSize / nPPTX).getStr());
         OUString aText = pColBar[SC_SPLIT_LEFT]->GetEntryText(nCol);
         aCol.put("text", aText.toUtf8().getStr());
         aCols.push_back(std::make_pair("", aCol));