2 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
3 * Copyright (C) 2013 Google Inc. All rights reserved.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB. If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
24 #include "platform/PlatformExport.h"
25 #include "platform/geometry/FloatRect.h"
26 #include "platform/geometry/FloatSize.h"
27 #include "platform/graphics/ImageBuffer.h"
28 #include "wtf/RefCounted.h"
34 class PLATFORM_EXPORT Filter : public RefCounted<Filter> {
36 Filter(const AffineTransform& absoluteTransform)
37 : m_absoluteTransform(absoluteTransform)
38 , m_inverseTransform(absoluteTransform.inverse())
40 // Filters can only accept scaling and translating transformations, as coordinates
41 // in most primitives are given in horizontal and vertical directions.
42 ASSERT(!absoluteTransform.b() && !absoluteTransform.c());
46 void setSourceImage(PassOwnPtr<ImageBuffer> sourceImage) { m_sourceImage = sourceImage; }
47 ImageBuffer* sourceImage() { return m_sourceImage.get(); }
49 const AffineTransform& absoluteTransform() const { return m_absoluteTransform; }
51 void setAbsoluteTransform(const AffineTransform& absoluteTransform)
53 // Filters can only accept scaling and translating transformations, as coordinates
54 // in most primitives are given in horizontal and vertical directions.
55 ASSERT(!absoluteTransform.b() && !absoluteTransform.c());
56 m_absoluteTransform = absoluteTransform;
57 m_inverseTransform = absoluteTransform.inverse();
58 m_absoluteFilterRegion = m_absoluteTransform.mapRect(m_filterRegion);
60 FloatPoint mapAbsolutePointToLocalPoint(const FloatPoint& point) const { return m_inverseTransform.mapPoint(point); }
61 FloatRect mapLocalRectToAbsoluteRect(const FloatRect& rect) const { return m_absoluteTransform.mapRect(rect); }
62 FloatRect mapAbsoluteRectToLocalRect(const FloatRect& rect) const { return m_inverseTransform.mapRect(rect); }
64 virtual float applyHorizontalScale(float value) const
66 return value * m_absoluteTransform.a();
68 virtual float applyVerticalScale(float value) const
70 return value * m_absoluteTransform.d();
72 virtual FloatPoint3D resolve3dPoint(const FloatPoint3D& point) const { return point; }
74 virtual IntRect sourceImageRect() const = 0;
76 FloatRect absoluteFilterRegion() const { return m_absoluteFilterRegion; }
78 FloatRect filterRegion() const { return m_filterRegion; }
79 void setFilterRegion(const FloatRect& rect)
81 m_filterRegion = rect;
82 m_absoluteFilterRegion = m_absoluteTransform.mapRect(m_filterRegion);
86 OwnPtr<ImageBuffer> m_sourceImage;
87 AffineTransform m_absoluteTransform;
88 AffineTransform m_inverseTransform;
89 FloatRect m_absoluteFilterRegion;
90 FloatRect m_filterRegion;