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1 /*
2  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
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 Filter_h
21 #define Filter_h
22 
23 #if ENABLE(FILTERS)
24 #include "FloatRect.h"
25 #include "FloatSize.h"
26 #include "ImageBuffer.h"
27 
28 #include <wtf/PassRefPtr.h>
29 #include <wtf/RefCounted.h>
30 #include <wtf/RefPtr.h>
31 #include <wtf/text/StringHash.h>
32 
33 namespace WebCore {
34 
35     class FilterEffect;
36 
37     class Filter : public RefCounted<Filter> {
38     public:
~Filter()39         virtual ~Filter() { }
40 
setSourceImage(PassOwnPtr<ImageBuffer> sourceImage)41         void setSourceImage(PassOwnPtr<ImageBuffer> sourceImage) { m_sourceImage = sourceImage; }
sourceImage()42         ImageBuffer* sourceImage() { return m_sourceImage.get(); }
43 
filterResolution()44         FloatSize filterResolution() const { return m_filterResolution; }
setFilterResolution(const FloatSize & filterResolution)45         void setFilterResolution(const FloatSize& filterResolution) { m_filterResolution = filterResolution; }
46 
applyHorizontalScale(float value)47         virtual float applyHorizontalScale(float value) const { return value * m_filterResolution.width(); }
applyVerticalScale(float value)48         virtual float applyVerticalScale(float value) const { return value * m_filterResolution.height(); }
49 
50         virtual FloatRect sourceImageRect() const = 0;
51         virtual FloatRect filterRegion() const = 0;
52 
mapAbsolutePointToLocalPoint(const FloatPoint &)53         virtual FloatPoint mapAbsolutePointToLocalPoint(const FloatPoint&) const { return FloatPoint(); }
54 
filterRegionInUserSpace()55         virtual FloatRect filterRegionInUserSpace() const { return FloatRect(); }
56 
57         virtual bool effectBoundingBoxMode() const = 0;
58 
59     private:
60         OwnPtr<ImageBuffer> m_sourceImage;
61         FloatSize m_filterResolution;
62     };
63 
64 } // namespace WebCore
65 
66 #endif // ENABLE(FILTERS)
67 
68 #endif // Filter_h
69