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1 /*
2  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Library General Public
6  * License as published by the Free Software Foundation; either
7  * version 2 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12  * Library General Public License for more details.
13  *
14  * You should have received a copy of the GNU Library General Public License
15  * along with this library; see the file COPYING.LIB.  If not, write to
16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17  * Boston, MA 02110-1301, USA.
18  */
19 
20 #ifndef SVGLengthContext_h
21 #define SVGLengthContext_h
22 
23 #include "core/svg/SVGUnitTypes.h"
24 #include "platform/geometry/FloatRect.h"
25 
26 namespace WebCore {
27 
28 class ExceptionState;
29 class SVGElement;
30 class SVGLength;
31 
32 enum SVGLengthType {
33     LengthTypeUnknown = 0,
34     LengthTypeNumber,
35     LengthTypePercentage,
36     LengthTypeEMS,
37     LengthTypeEXS,
38     LengthTypePX,
39     LengthTypeCM,
40     LengthTypeMM,
41     LengthTypeIN,
42     LengthTypePT,
43     LengthTypePC
44 };
45 
46 enum SVGLengthMode {
47     LengthModeWidth = 0,
48     LengthModeHeight,
49     LengthModeOther
50 };
51 
52 class SVGLengthContext {
53 public:
54     explicit SVGLengthContext(const SVGElement*);
55 
56     template<typename T>
resolveRectangle(const T * context,SVGUnitTypes::SVGUnitType type,const FloatRect & viewport)57     static FloatRect resolveRectangle(const T* context, SVGUnitTypes::SVGUnitType type, const FloatRect& viewport)
58     {
59         return SVGLengthContext::resolveRectangle(context, type, viewport, context->xCurrentValue(), context->yCurrentValue(), context->widthCurrentValue(), context->heightCurrentValue());
60     }
61 
62     static FloatRect resolveRectangle(const SVGElement*, SVGUnitTypes::SVGUnitType, const FloatRect& viewport, const SVGLength& x, const SVGLength& y, const SVGLength& width, const SVGLength& height);
63     static FloatPoint resolvePoint(const SVGElement*, SVGUnitTypes::SVGUnitType, const SVGLength& x, const SVGLength& y);
64     static float resolveLength(const SVGElement*, SVGUnitTypes::SVGUnitType, const SVGLength&);
65 
66     float convertValueToUserUnits(float, SVGLengthMode, SVGLengthType fromUnit, ExceptionState&) const;
67     float convertValueFromUserUnits(float, SVGLengthMode, SVGLengthType toUnit, ExceptionState&) const;
68 
69     bool determineViewport(FloatSize&) const;
70 
71 private:
72     SVGLengthContext(const SVGElement*, const FloatRect& viewport);
73 
74     float convertValueFromUserUnitsToPercentage(float value, SVGLengthMode, ExceptionState&) const;
75     float convertValueFromPercentageToUserUnits(float value, SVGLengthMode, ExceptionState&) const;
76 
77     float convertValueFromUserUnitsToEMS(float value, ExceptionState&) const;
78     float convertValueFromEMSToUserUnits(float value, ExceptionState&) const;
79 
80     float convertValueFromUserUnitsToEXS(float value, ExceptionState&) const;
81     float convertValueFromEXSToUserUnits(float value, ExceptionState&) const;
82 
83     const SVGElement* m_context;
84     FloatRect m_overridenViewport;
85 };
86 
87 } // namespace WebCore
88 
89 #endif // SVGLengthContext_h
90