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/* $Id$
-----------------------------------------------------------------------------
This source file is part of VideoTexture library
Copyright (c) 2007 The Zdeno Ash Miklas
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.
This program 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.
-----------------------------------------------------------------------------
*/
/** \file FilterBase.h
* \ingroup bgevideotex
*/
#if !defined FILTERBASE_H
#define FILTERBASE_H
#include "Common.h"
#include <PyObjectPlus.h>
#include "PyTypeList.h"
#define VT_C(v,idx) ((unsigned char*)&v)[idx]
#define VT_R(v) ((unsigned char*)&v)[0]
#define VT_G(v) ((unsigned char*)&v)[1]
#define VT_B(v) ((unsigned char*)&v)[2]
#define VT_A(v) ((unsigned char*)&v)[3]
#define VT_RGBA(v,r,g,b,a) VT_R(v)=(unsigned char)r, VT_G(v)=(unsigned char)g, VT_B(v)=(unsigned char)b, VT_A(v)=(unsigned char)a
// forward declaration
class FilterBase;
// python structure for filter
struct PyFilter
{
PyObject_HEAD
// source object
FilterBase * m_filter;
};
/// base class for pixel filters
class FilterBase
{
public:
/// constructor
FilterBase (void);
/// destructor
virtual ~FilterBase (void);
// release python objects
virtual void release (void);
/// convert pixel
template <class SRC> unsigned int convert (SRC src, short x, short y,
short * size, unsigned int pixSize)
{
return filter(src, x, y, size, pixSize,
convertPrevious(src, x, y, size, pixSize));
}
/// get previous filter
PyFilter * getPrevious (void) { return m_previous; }
/// set previous filter
void setPrevious (PyFilter * filt, bool useRefCnt = true);
/// find first filter in chain
FilterBase * findFirst (void);
/// get first filter's source pixel size
unsigned int firstPixelSize (void) { return findFirst()->getPixelSize(); }
protected:
/// previous pixel filter
PyFilter * m_previous;
/// filter pixel, source byte buffer
virtual unsigned int filter (unsigned char * src, short x, short y,
short * size, unsigned int pixSize, unsigned int val = 0)
{ return val; }
/// filter pixel, source int buffer
virtual unsigned int filter (unsigned int * src, short x, short y,
short * size, unsigned int pixSize, unsigned int val = 0)
{ return val; }
/// get source pixel size
virtual unsigned int getPixelSize (void) { return 1; }
/// get converted pixel from previous filters
template <class SRC> unsigned int convertPrevious (SRC src, short x, short y,
short * size, unsigned int pixSize)
{
// if previous filter doesn't exists, return source pixel
if (m_previous == NULL) return *src;
// otherwise return converted pixel
return m_previous->m_filter->convert(src, x, y, size, pixSize);
}
};
// list of python filter types
extern PyTypeList pyFilterTypes;
// functions for python interface
// object initialization
template <class T> static int Filter_init (PyObject * pySelf, PyObject * args, PyObject * kwds)
{
PyFilter * self = reinterpret_cast<PyFilter*>(pySelf);
// create filter object
if (self->m_filter != NULL) delete self->m_filter;
self->m_filter = new T();
// initialization succeded
return 0;
}
// object allocation
PyObject * Filter_allocNew (PyTypeObject * type, PyObject * args, PyObject * kwds);
// object deallocation
void Filter_dealloc (PyFilter * self);
// get previous pixel filter object
PyObject * Filter_getPrevious (PyFilter * self, void * closure);
// set previous pixel filter object
int Filter_setPrevious (PyFilter * self, PyObject * value, void * closure);
#endif
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