1/*
2    Copyright (C) 2004, 2005, 2008 Nikolas Zimmermann <zimmermann@kde.org>
3                  2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
4
5    This library is free software; you can redistribute it and/or
6    modify it under the terms of the GNU Library General Public
7    License as published by the Free Software Foundation; either
8    version 2 of the License, or (at your option) any later version.
9
10    This library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Library General Public License for more details.
14
15    You should have received a copy of the GNU Library General Public License
16    along with this library; see the file COPYING.LIB.  If not, write to
17    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18    Boston, MA 02110-1301, USA.
19*/
20
21#ifndef SVGPreserveAspectRatio_h
22#define SVGPreserveAspectRatio_h
23
24#if ENABLE(SVG)
25#include "FloatRect.h"
26#include "PlatformString.h"
27#include "SVGNames.h"
28
29namespace WebCore {
30
31    class String;
32    class AffineTransform;
33
34    class SVGPreserveAspectRatio {
35    public:
36        enum SVGPreserveAspectRatioType {
37            SVG_PRESERVEASPECTRATIO_UNKNOWN     = 0,
38            SVG_PRESERVEASPECTRATIO_NONE        = 1,
39            SVG_PRESERVEASPECTRATIO_XMINYMIN    = 2,
40            SVG_PRESERVEASPECTRATIO_XMIDYMIN    = 3,
41            SVG_PRESERVEASPECTRATIO_XMAXYMIN    = 4,
42            SVG_PRESERVEASPECTRATIO_XMINYMID    = 5,
43            SVG_PRESERVEASPECTRATIO_XMIDYMID    = 6,
44            SVG_PRESERVEASPECTRATIO_XMAXYMID    = 7,
45            SVG_PRESERVEASPECTRATIO_XMINYMAX    = 8,
46            SVG_PRESERVEASPECTRATIO_XMIDYMAX    = 9,
47            SVG_PRESERVEASPECTRATIO_XMAXYMAX    = 10
48        };
49
50        enum SVGMeetOrSliceType {
51            SVG_MEETORSLICE_UNKNOWN    = 0,
52            SVG_MEETORSLICE_MEET       = 1,
53            SVG_MEETORSLICE_SLICE      = 2
54        };
55
56        SVGPreserveAspectRatio();
57        virtual ~SVGPreserveAspectRatio();
58
59        void setAlign(unsigned short);
60        unsigned short align() const;
61
62        void setMeetOrSlice(unsigned short);
63        unsigned short meetOrSlice() const;
64
65        void transformRect(FloatRect& destRect, FloatRect& srcRect);
66
67        AffineTransform getCTM(double logicX, double logicY,
68                               double logicWidth, double logicHeight,
69                               double physX, double physY,
70                               double physWidth, double physHeight) const;
71
72        template<class Consumer>
73        static bool parsePreserveAspectRatio(Consumer* consumer, const String& value, bool validate = true)
74        {
75            bool result = false;
76            const UChar* begin = value.characters();
77            const UChar* end = begin + value.length();
78            consumer->setPreserveAspectRatioBaseValue(parsePreserveAspectRatio(begin, end, validate, result));
79            return result;
80        }
81
82        // It's recommended to use the method above, only SVGViewSpec needs this parsing method
83        static SVGPreserveAspectRatio parsePreserveAspectRatio(const UChar*& currParam, const UChar* end, bool validate, bool& result);
84
85        String valueAsString() const;
86
87    private:
88        unsigned short m_align;
89        unsigned short m_meetOrSlice;
90    };
91
92} // namespace WebCore
93
94#endif // ENABLE(SVG)
95#endif // SVGPreserveAspectRatio_h
96