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#pragma once
21
22#include "ExceptionOr.h"
23#include "FloatRect.h"
24#include "SVGUnitTypes.h"
25
26namespace WebCore {
27
28class SVGElement;
29class SVGLengthValue;
30
31struct Length;
32
33enum SVGLengthType {
34 LengthTypeUnknown = 0,
35 LengthTypeNumber,
36 LengthTypePercentage,
37 LengthTypeEMS,
38 LengthTypeEXS,
39 LengthTypePX,
40 LengthTypeCM,
41 LengthTypeMM,
42 LengthTypeIN,
43 LengthTypePT,
44 LengthTypePC
45};
46
47enum SVGLengthMode {
48 LengthModeWidth = 0,
49 LengthModeHeight,
50 LengthModeOther
51};
52
53class SVGLengthContext {
54public:
55 explicit SVGLengthContext(const SVGElement*);
56
57 template<typename T>
58 static FloatRect resolveRectangle(const T* context, SVGUnitTypes::SVGUnitType type, const FloatRect& viewport)
59 {
60 return SVGLengthContext::resolveRectangle(context, type, viewport, context->x(), context->y(), context->width(), context->height());
61 }
62
63 static FloatRect resolveRectangle(const SVGElement*, SVGUnitTypes::SVGUnitType, const FloatRect& viewport, const SVGLengthValue& x, const SVGLengthValue& y, const SVGLengthValue& width, const SVGLengthValue& height);
64 static FloatPoint resolvePoint(const SVGElement*, SVGUnitTypes::SVGUnitType, const SVGLengthValue& x, const SVGLengthValue& y);
65 static float resolveLength(const SVGElement*, SVGUnitTypes::SVGUnitType, const SVGLengthValue&);
66
67 float valueForLength(const Length&, SVGLengthMode = LengthModeOther);
68 ExceptionOr<float> convertValueToUserUnits(float, SVGLengthMode, SVGLengthType fromUnit) const;
69 ExceptionOr<float> convertValueFromUserUnits(float, SVGLengthMode, SVGLengthType toUnit) const;
70
71 bool determineViewport(FloatSize&) const;
72
73private:
74 SVGLengthContext(const SVGElement*, const FloatRect& viewport);
75
76 ExceptionOr<float> convertValueFromUserUnitsToPercentage(float value, SVGLengthMode) const;
77 ExceptionOr<float> convertValueFromPercentageToUserUnits(float value, SVGLengthMode) const;
78
79 ExceptionOr<float> convertValueFromUserUnitsToEMS(float value) const;
80 ExceptionOr<float> convertValueFromEMSToUserUnits(float value) const;
81
82 ExceptionOr<float> convertValueFromUserUnitsToEXS(float value) const;
83 ExceptionOr<float> convertValueFromEXSToUserUnits(float value) const;
84
85 const SVGElement* m_context;
86 FloatRect m_overriddenViewport;
87};
88
89} // namespace WebCore
90