1 files changed, 89 insertions, 0 deletions
diff --git a/sc/source/ui/view/drawutil.cxx b/sc/source/ui/view/drawutil.cxx
new file mode 100644
index 0000000000..9658fa7ff2
--- /dev/null
+++ b/sc/source/ui/view/drawutil.cxx
@@ -0,0 +1,89 @@
+/* -*- 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/config.h>
+
+#include <o3tl/unit_conversion.hxx>
+#include <vcl/outdev.hxx>
+
+#include <drawutil.hxx>
+#include <document.hxx>
+#include <viewdata.hxx>
+
+void ScDrawUtil::CalcScale( const ScDocument& rDoc, SCTAB nTab,
+                            SCCOL nStartCol, SCROW nStartRow, SCCOL nEndCol, SCROW nEndRow,
+                            const OutputDevice* pDev,
+                            const Fraction& rZoomX, const Fraction& rZoomY,
+                            double nPPTX, double nPPTY,
+                            Fraction& rScaleX, Fraction& rScaleY )
+{
+    tools::Long nPixelX = 0;
+    tools::Long nTwipsX = 0;
+    tools::Long nPixelY = 0;
+    tools::Long nTwipsY = 0;
+    for (SCCOL i=nStartCol; i<nEndCol; i++)
+    {
+        sal_uInt16 nWidth = rDoc.GetColWidth(i,nTab);
+        nTwipsX += static_cast<tools::Long>(nWidth);
+        nPixelX += ScViewData::ToPixel( nWidth, nPPTX );
+    }
+
+    for (SCROW nRow = nStartRow; nRow <= nEndRow-1; ++nRow)
+    {
+        SCROW nLastRow = nRow;
+        if (rDoc.RowHidden(nRow, nTab, nullptr, &nLastRow))
+        {
+            nRow = nLastRow;
+            continue;
+        }
+
+        sal_uInt16 nHeight = rDoc.GetRowHeight(nRow, nTab);
+        nTwipsY += static_cast<tools::Long>(nHeight);
+        nPixelY += ScViewData::ToPixel(nHeight, nPPTY);
+    }
+
+    MapMode aHMMMode( MapUnit::Map100thMM, Point(), rZoomX, rZoomY );
+    Point aPixelLog = pDev->PixelToLogic( Point( nPixelX,nPixelY ), aHMMMode );
+
+    //  Fraction(double) ctor can be used here (and avoid overflows of PixelLog * Zoom)
+    //  because ReduceInaccurate is called later anyway.
+
+    if ( aPixelLog.X() && nTwipsX )
+        rScaleX = Fraction( static_cast<double>(aPixelLog.X()) *
+                            static_cast<double>(rZoomX.GetNumerator()) /
+                            o3tl::convert<double>(nTwipsX, o3tl::Length::twip, o3tl::Length::mm100) /
+                            static_cast<double>(rZoomX.GetDenominator()) );
+    else
+        rScaleX = Fraction( 1, 1 );
+
+    if ( aPixelLog.Y() && nTwipsY )
+        rScaleY = Fraction( static_cast<double>(aPixelLog.Y()) *
+                            static_cast<double>(rZoomY.GetNumerator()) /
+                            o3tl::convert<double>(nTwipsY, o3tl::Length::twip, o3tl::Length::mm100) /
+                            static_cast<double>(rZoomY.GetDenominator()) );
+    else
+        rScaleY = Fraction( 1, 1 );
+
+    //  25 bits of accuracy are needed to always hit the right part of
+    //  cells in the last rows (was 17 before 1M rows).
+    rScaleX.ReduceInaccurate( 25 );
+    rScaleY.ReduceInaccurate( 25 );
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */