1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
/*
* Copyright (C) 2008 Alex Mathews <possessedpenguinbob@gmail.com>
* Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
* Copyright (C) 2005 Eric Seidel <eric@webkit.org>
* Copyright (C) 2010 Zoltan Herczeg <zherczeg@webkit.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef LightSource_h
#define LightSource_h
#if ENABLE(FILTERS)
#include "FloatPoint3D.h"
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
namespace WebCore {
enum LightType {
LS_DISTANT,
LS_POINT,
LS_SPOT
};
class TextStream;
class LightSource : public RefCounted<LightSource> {
public:
// Light vectors must be calculated for every pixel during
// painting. It is expensive to pass all these arguments to
// a frequently called function, especially because not all
// light sources require all of them. Instead, we just pass
// a reference to the following structure
struct PaintingData {
// SVGFELighting also use them
FloatPoint3D lightVector;
FloatPoint3D colorVector;
float lightVectorLength;
// Private members
FloatPoint3D directionVector;
FloatPoint3D privateColorVector;
float coneCutOffLimit;
float coneFullLight;
int specularExponent;
};
LightSource(LightType type)
: m_type(type)
{ }
virtual ~LightSource() { }
LightType type() const { return m_type; }
virtual TextStream& externalRepresentation(TextStream&) const = 0;
virtual void initPaintingData(PaintingData&) = 0;
// z is a float number, since it is the alpha value scaled by a user
// specified "surfaceScale" constant, which type is <number> in the SVG standard
virtual void updatePaintingData(PaintingData&, int x, int y, float z) = 0;
bool setAzimuth(float);
bool setElevation(float);
bool setX(float);
bool setY(float);
bool setZ(float);
bool setPointsAtX(float);
bool setPointsAtY(float);
bool setPointsAtZ(float);
bool setSpecularExponent(float);
bool setLimitingConeAngle(float);
private:
LightType m_type;
};
} // namespace WebCore
#endif // ENABLE(FILTERS)
#endif // LightSource_h
|
