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      1 /*
      2     Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann (at) kde.org>
      3                   2004, 2005 Rob Buis <buis (at) kde.org>
      4                   2005 Eric Seidel <eric (at) webkit.org>
      5 
      6     This library is free software; you can redistribute it and/or
      7     modify it under the terms of the GNU Library General Public
      8     License as published by the Free Software Foundation; either
      9     version 2 of the License, or (at your option) any later version.
     10 
     11     This library is distributed in the hope that it will be useful,
     12     but WITHOUT ANY WARRANTY; without even the implied warranty of
     13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14     Library General Public License for more details.
     15 
     16     You should have received a copy of the GNU Library General Public License
     17     aint with this library; see the file COPYING.LIB.  If not, write to
     18     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     19     Boston, MA 02110-1301, USA.
     20 */
     21 
     22 #ifndef SVGFEComponentTransfer_h
     23 #define SVGFEComponentTransfer_h
     24 
     25 #if ENABLE(FILTERS)
     26 #include "FilterEffect.h"
     27 
     28 #include "Filter.h"
     29 #include <wtf/Vector.h>
     30 
     31 namespace WebCore {
     32 
     33     enum ComponentTransferType {
     34         FECOMPONENTTRANSFER_TYPE_UNKNOWN  = 0,
     35         FECOMPONENTTRANSFER_TYPE_IDENTITY = 1,
     36         FECOMPONENTTRANSFER_TYPE_TABLE    = 2,
     37         FECOMPONENTTRANSFER_TYPE_DISCRETE = 3,
     38         FECOMPONENTTRANSFER_TYPE_LINEAR   = 4,
     39         FECOMPONENTTRANSFER_TYPE_GAMMA    = 5
     40     };
     41 
     42     struct ComponentTransferFunction {
     43         ComponentTransferFunction()
     44             : type(FECOMPONENTTRANSFER_TYPE_UNKNOWN)
     45             , slope(0.0f)
     46             , intercept(0.0f)
     47             , amplitude(0.0f)
     48             , exponent(0.0f)
     49             , offset(0.0f)
     50         {
     51         }
     52 
     53         ComponentTransferType type;
     54 
     55         float slope;
     56         float intercept;
     57         float amplitude;
     58         float exponent;
     59         float offset;
     60 
     61         Vector<float> tableValues;
     62     };
     63 
     64     class FEComponentTransfer : public FilterEffect {
     65     public:
     66         static PassRefPtr<FEComponentTransfer> create(FilterEffect*, const ComponentTransferFunction&,
     67                 const ComponentTransferFunction&, const ComponentTransferFunction&, const ComponentTransferFunction&);
     68 
     69         ComponentTransferFunction redFunction() const;
     70         void setRedFunction(const ComponentTransferFunction&);
     71 
     72         ComponentTransferFunction greenFunction() const;
     73         void setGreenFunction(const ComponentTransferFunction&);
     74 
     75         ComponentTransferFunction blueFunction() const;
     76         void setBlueFunction(const ComponentTransferFunction&);
     77 
     78         ComponentTransferFunction alphaFunction() const;
     79         void setAlphaFunction(const ComponentTransferFunction&);
     80 
     81         virtual FloatRect uniteChildEffectSubregions(Filter* filter) { return calculateUnionOfChildEffectSubregions(filter, m_in.get()); }
     82         void apply(Filter*);
     83         void dump();
     84 
     85     private:
     86         FEComponentTransfer(FilterEffect*,const ComponentTransferFunction&, const ComponentTransferFunction&,
     87                 const ComponentTransferFunction&, const ComponentTransferFunction&);
     88 
     89         RefPtr<FilterEffect> m_in;
     90         ComponentTransferFunction m_redFunc;
     91         ComponentTransferFunction m_greenFunc;
     92         ComponentTransferFunction m_blueFunc;
     93         ComponentTransferFunction m_alphaFunc;
     94     };
     95 
     96 } // namespace WebCore
     97 
     98 #endif // ENABLE(FILTERS)
     99 
    100 #endif // SVGFEComponentTransfer_h
    101