2 * Copyright (C) 2008 Alex Mathews <possessedpenguinbob@gmail.com>
3 * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
4 * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
5 * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
6 * Copyright (C) 2010 Zoltan Herczeg <zherczeg@webkit.org>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public License
19 * along with this library; see the file COPYING.LIB. If not, write to
20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
27 #include "platform/PlatformExport.h"
28 #include "platform/geometry/FloatPoint3D.h"
29 #include "wtf/PassRefPtr.h"
30 #include "wtf/RefCounted.h"
42 class PLATFORM_EXPORT LightSource : public RefCounted<LightSource> {
45 // Light vectors must be calculated for every pixel during
46 // painting. It is expensive to pass all these arguments to
47 // a frequently called function, especially because not all
48 // light sources require all of them. Instead, we just pass
49 // a reference to the following structure
51 // SVGFELighting also use them
52 FloatPoint3D lightVector;
53 FloatPoint3D colorVector;
54 float lightVectorLength;
56 FloatPoint3D directionVector;
57 FloatPoint3D privateColorVector;
58 float coneCutOffLimit;
62 LightSource(LightType type)
66 virtual ~LightSource();
68 LightType type() const { return m_type; }
69 virtual TextStream& externalRepresentation(TextStream&) const = 0;
71 virtual PassRefPtr<LightSource> create(const FloatPoint3D& scale, const FloatSize& offset) const = 0;
73 virtual void initPaintingData(PaintingData&) const = 0;
74 // z is a float number, since it is the alpha value scaled by a user
75 // specified "surfaceScale" constant, which type is <number> in the SVG standard
76 virtual void updatePaintingData(PaintingData&, int x, int y, float z) const = 0;
78 virtual bool setAzimuth(float) { return false; }
79 virtual bool setElevation(float) { return false; }
80 virtual bool setPosition(const FloatPoint3D&) { return false; }
81 virtual bool setPointsAt(const FloatPoint3D&) { return false; }
82 virtual bool setSpecularExponent(float) { return false; }
83 virtual bool setLimitingConeAngle(float) { return false; }
91 #endif // LightSource_h