1 files changed, 122 insertions, 0 deletions
diff --git a/include/tools/UnitConversion.hxx b/include/tools/UnitConversion.hxx
new file mode 100644
index 0000000000..43237e0514
--- /dev/null
+++ b/include/tools/UnitConversion.hxx
@@ -0,0 +1,122 @@
+/* -*- 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/.
+ *
+ */
+
+#pragma once
+
+#include <o3tl/unit_conversion.hxx>
+#include <sal/types.h>
+#include <tools/fldunit.hxx>
+#include <tools/fract.hxx>
+#include <tools/mapunit.hxx>
+
+constexpr o3tl::Length FieldToO3tlLength(FieldUnit eU, o3tl::Length ePixelValue = o3tl::Length::px)
+{
+    switch (eU)
+    {
+        case FieldUnit::MM:
+            return o3tl::Length::mm;
+        case FieldUnit::CM:
+            return o3tl::Length::cm;
+        case FieldUnit::M:
+            return o3tl::Length::m;
+        case FieldUnit::KM:
+            return o3tl::Length::km;
+        case FieldUnit::TWIP:
+            return o3tl::Length::twip;
+        case FieldUnit::POINT:
+            return o3tl::Length::pt;
+        case FieldUnit::PICA:
+            return o3tl::Length::pc;
+        case FieldUnit::INCH:
+            return o3tl::Length::in;
+        case FieldUnit::FOOT:
+            return o3tl::Length::ft;
+        case FieldUnit::MILE:
+            return o3tl::Length::mi;
+        case FieldUnit::CHAR:
+            return o3tl::Length::ch;
+        case FieldUnit::LINE:
+            return o3tl::Length::line;
+        case FieldUnit::MM_100TH:
+            return o3tl::Length::mm100;
+        case FieldUnit::PIXEL:
+            return ePixelValue;
+        default:
+            return o3tl::Length::invalid;
+    }
+}
+
+constexpr o3tl::Length MapToO3tlLength(MapUnit eU, o3tl::Length ePixelValue = o3tl::Length::px)
+{
+    switch (eU)
+    {
+        case MapUnit::Map100thMM:
+            return o3tl::Length::mm100;
+        case MapUnit::Map10thMM:
+            return o3tl::Length::mm10;
+        case MapUnit::MapMM:
+            return o3tl::Length::mm;
+        case MapUnit::MapCM:
+            return o3tl::Length::cm;
+        case MapUnit::Map1000thInch:
+            return o3tl::Length::in1000;
+        case MapUnit::Map100thInch:
+            return o3tl::Length::in100;
+        case MapUnit::Map10thInch:
+            return o3tl::Length::in10;
+        case MapUnit::MapInch:
+            return o3tl::Length::in;
+        case MapUnit::MapPoint:
+            return o3tl::Length::pt;
+        case MapUnit::MapTwip:
+            return o3tl::Length::twip;
+        case MapUnit::MapPixel:
+            return ePixelValue;
+        default:
+            return o3tl::Length::invalid;
+    }
+}
+
+inline Fraction conversionFract(o3tl::Length from, o3tl::Length to)
+{
+    const auto & [ mul, div ] = o3tl::getConversionMulDiv(from, to);
+    return { mul, div };
+}
+
+template <typename N> constexpr auto convertTwipToMm100(N n)
+{
+    return o3tl::convert(n, o3tl::Length::twip, o3tl::Length::mm100);
+}
+
+constexpr sal_Int64 sanitiseMm100ToTwip(sal_Int64 n)
+{
+    return o3tl::convertSaturate(n, o3tl::Length::mm100, o3tl::Length::twip);
+}
+
+template <typename N> constexpr auto convertPointToMm100(N n)
+{
+    return o3tl::convert(n, o3tl::Length::pt, o3tl::Length::mm100);
+}
+template <typename N> constexpr auto convertMm100ToPoint(N n)
+{
+    return o3tl::convert(n, o3tl::Length::mm100, o3tl::Length::pt);
+}
+
+// PPT's "master unit" (1/576 inch) <=> mm/100
+template <typename N> constexpr auto convertMasterUnitToMm100(N n)
+{
+    return o3tl::convert(n, o3tl::Length::master, o3tl::Length::mm100);
+}
+template <typename N> constexpr auto convertMm100ToMasterUnit(N n)
+{
+    return o3tl::convert(n, o3tl::Length::mm100, o3tl::Length::master);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */