svgio/inc/SvgNumber.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  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #pragma once
  21
  22 #include <basegfx/range/b2drange.hxx>
  23 #include <vector>
  24
  25 namespace svgio::svgreader
  26 {
  27
  28 // recommended value for this device dependent unit, see CSS2 section 4.3.2 Lengths
  29 constexpr const double F_SVG_PIXEL_PER_INCH = 96.0;
  30
  31 enum class NumberType
  32 {
  33     xcoordinate,
  34     ycoordinate,
  35     length
  36 };
  37
  38 class InfoProvider
  39 {
  40 public:
  41     virtual ~InfoProvider() {}
  42     virtual basegfx::B2DRange getCurrentViewPort() const = 0;
  43     /// return font size of node inherited from parents
  44     virtual double getCurrentFontSizeInherited() const = 0;
  45     /// return xheight of node inherited from parents
  46     virtual double getCurrentXHeightInherited() const = 0;
  47 };
  48
  49 enum class SvgUnit
  50 {
  51     em = 0,    // relative to current font size
  52     ex,        // relative to current x-height
  53
  54     px,        // 'user unit'
  55     pt,        // points, 1.25 px
  56     pc,        // 15.0 px
  57     cm,        // 35.43307 px
  58     mm,        // 3.543307 px
  59     in,        // 90 px
  60
  61     percent,   // relative to range
  62     none       // for stroke-miterlimit, which has no unit
  63 };
  64
  65 class SvgNumber
  66 {
  67 private:
  68     double      mfNumber;
  69     SvgUnit     meUnit;
  70
  71     bool        mbSet : 1;
  72
  73 public:
  74     SvgNumber()
  75     :   mfNumber(0.0),
  76         meUnit(SvgUnit::px),
  77         mbSet(false)
  78     {
  79     }
  80
  81     SvgNumber(double fNum, SvgUnit aSvgUnit = SvgUnit::px, bool bSet = true)
  82     :   mfNumber(fNum),
  83         meUnit(aSvgUnit),
  84         mbSet(bSet)
  85     {
  86     }
  87
  88     double getNumber() const
  89     {
  90         return mfNumber;
  91     }
  92
  93     SvgUnit getUnit() const
  94     {
  95         return meUnit;
  96     }
  97
  98     bool isSet() const
  99     {
 100         return mbSet;
 101     }
 102
 103     bool isPositive() const
 104     {
 105         return basegfx::fTools::moreOrEqual(mfNumber, 0.0);
 106     }
 107
 108     // Only usable in cases, when the unit is not SvgUnit::percent, otherwise use method solve
 109     double solveNonPercentage(const InfoProvider& rInfoProvider) const;
 110
 111     double solve(const InfoProvider& rInfoProvider, NumberType aNumberType = NumberType::length) const;
 112 };
 113
 114 typedef std::vector<SvgNumber> SvgNumberVector;
 115
 116 } // end of namespace svgio::svgreader
 117
 118 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */