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#if ENABLE(SVG)
24#include "FloatRect.h"
25#include "SVGUnitTypes.h"
26
27namespace WebCore {
28
29class SVGElement;
30class SVGLength;
31
32typedef int ExceptionCode;
33
34enum SVGLengthType {
35    LengthTypeUnknown = 0,
36    LengthTypeNumber,
37    LengthTypePercentage,
38    LengthTypeEMS,
39    LengthTypeEXS,
40    LengthTypePX,
41    LengthTypeCM,
42    LengthTypeMM,
43    LengthTypeIN,
44    LengthTypePT,
45    LengthTypePC
46};
47
48enum SVGLengthMode {
49    LengthModeWidth = 0,
50    LengthModeHeight,
51    LengthModeOther
52};
53
54class SVGLengthContext {
55public:
56    explicit SVGLengthContext(const SVGElement*);
57
58    template<typename T>
59    static FloatRect resolveRectangle(const T* context, SVGUnitTypes::SVGUnitType type, const FloatRect& viewport)
60    {
61        return SVGLengthContext::resolveRectangle(context, type, viewport, context->x(), context->y(), context->width(), context->height());
62    }
63
64    static FloatRect resolveRectangle(const SVGElement*, SVGUnitTypes::SVGUnitType, const FloatRect& viewport, const SVGLength& x, const SVGLength& y, const SVGLength& width, const SVGLength& height);
65    static FloatPoint resolvePoint(const SVGElement*, SVGUnitTypes::SVGUnitType, const SVGLength& x, const SVGLength& y);
66    static float resolveLength(const SVGElement*, SVGUnitTypes::SVGUnitType, const SVGLength&);
67
68    float convertValueToUserUnits(float, SVGLengthMode, SVGLengthType fromUnit, ExceptionCode&) const;
69    float convertValueFromUserUnits(float, SVGLengthMode, SVGLengthType toUnit, ExceptionCode&) const;
70
71    bool determineViewport(float& width, float& height) const;
72
73private:
74    SVGLengthContext(const SVGElement*, const FloatRect& viewport);
75
76    float convertValueFromUserUnitsToPercentage(float value, SVGLengthMode, ExceptionCode&) const;
77    float convertValueFromPercentageToUserUnits(float value, SVGLengthMode, ExceptionCode&) const;
78
79    float convertValueFromUserUnitsToEMS(float value, ExceptionCode&) const;
80    float convertValueFromEMSToUserUnits(float value, ExceptionCode&) const;
81
82    float convertValueFromUserUnitsToEXS(float value, ExceptionCode&) const;
83    float convertValueFromEXSToUserUnits(float value, ExceptionCode&) const;
84
85    const SVGElement* m_context;
86    FloatRect m_overridenViewport;
87};
88
89} // namespace WebCore
90
91#endif // ENABLE(SVG)
92#endif // SVGLengthContext_h
93