include/tools/UnitConversion.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  */
  10
  11 #pragma once
  12
  13 #include <sal/types.h>
  14
  15 constexpr sal_Int64 convertTwipToMm100(sal_Int64 n)
  16 {
  17     return (n >= 0) ? (n * 127 + 36) / 72 : (n * 127 - 36) / 72;
  18 }
  19
  20 constexpr sal_Int64 convertMm100ToTwip(sal_Int64 n)
  21 {
  22     return (n >= 0) ? (n * 72 + 63) / 127 : (n * 72 - 63) / 127;
  23 }
  24
  25 constexpr sal_Int64 convertPointToTwip(sal_Int64 nNumber) { return nNumber * 20; }
  26
  27 constexpr sal_Int64 convertPointToMm100(sal_Int64 nNumber)
  28 {
  29     return convertTwipToMm100(convertPointToTwip(nNumber));
  30 }
  31
  32 constexpr double convertTwipToPixel(double nNumber) { return nNumber / 15.0; }
  33
  34 constexpr double convertPointToTwip(double fNumber) { return fNumber * 20.0; }
  35
  36 constexpr double convertPointToMm100(double fNumber) { return fNumber * (2540.0 / 72.0); }
  37
  38 // Convert PPT's "master unit" (1/576 inch) to mm/100
  39 constexpr sal_Int64 convertMasterUnitToMm100(sal_Int64 n) { return n * (2540.0 / 576.0); }
  40
  41 // Convert mm/100 to PPT's "master unit"
  42 constexpr sal_Int64 convertMm100ToMasterUnit(sal_Int64 n) { return n / (2540.0 / 576.0); }
  43
  44 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */