+++ /dev/null
-/*! ========================================================================
-** Extended Template Library
-** Gaussian Blur Template Implementation
-** $Id$
-**
-** Copyright (c) 2002 Robert B. Quattlebaum Jr.
-**
-** This package is free software; you can redistribute it and/or
-** modify it under the terms of the GNU General Public License as
-** published by the Free Software Foundation; either version 2 of
-** the License, or (at your option) any later version.
-**
-** This package 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
-** General Public License for more details.
-**
-** === N O T E S ===========================================================
-**
-** This is an internal header file, included by other ETL headers.
-** You should not attempt to use it directly.
-**
-** ========================================================================= */
-
-/* === S T A R T =========================================================== */
-
-#ifndef __ETL_GAUSSIAN_H
-#define __ETL_GAUSSIAN_H
-
-/* === H E A D E R S ======================================================= */
-
-#include <cstring> // for memset()
-#include <iterator>
-
-/* === M A C R O S ========================================================= */
-
-/* === T Y P E D E F S ===================================================== */
-
-/* === C L A S S E S & S T R U C T S ======================================= */
-
-_ETL_BEGIN_NAMESPACE
-
-template<typename T> void
-gaussian_blur_5x5_(T pen,int w, int h,
-typename T::pointer SC0,
-typename T::pointer SC1,
-typename T::pointer SC2,
-typename T::pointer SC3)
-{
- int x,y;
- typename T::value_type Tmp1,Tmp2,SR0,SR1,SR2,SR3;
-
- //typename T::iterator_x iter;
-
- // Setup the row buffers
- for(x=0;x<w;x++)SC0[x+2]=pen.x()[x]*24;
- memset(SC1,0,(w+2)*sizeof(typename T::value_type));
- memset(SC2,0,(w+2)*sizeof(typename T::value_type));
- memset(SC3,0,(w+2)*sizeof(typename T::value_type));
-
- for(y=0;y<h+2;y++,pen.inc_y())
- {
- int yadj;
- if(y>=h)
- {yadj=(h-y)-1; SR0=pen.y()[yadj]*1.35;}
- else
- {yadj=0; SR0=pen.get_value()*1.35; }
-
- SR1=SR2=SR3=typename T::value_type();
- for(x=0;x<w+2;x++,pen.inc_x())
- {
- if(x>=w)
- Tmp1=pen[yadj][(w-x)-1];
- else
- Tmp1=*pen[yadj];
-
- Tmp2=SR0+Tmp1;
- SR0=Tmp1;
- Tmp1=SR1+Tmp2;
- SR1=Tmp2;
- Tmp2=SR2+Tmp1;
- SR2=Tmp1;
- Tmp1=SR3+Tmp2;
- SR3=Tmp2;
-
- // Column Machine
- Tmp2=SC0[x]+Tmp1;
- SC0[x]=Tmp1;
- Tmp1=SC1[x]+Tmp2;
- SC1[x]=Tmp2;
- Tmp2=SC2[x]+Tmp1;
- SC2[x]=Tmp1;
- if(y>1&&x>1)
- pen[-2][-2]=(SC3[x]+Tmp2)/256;
- SC3[x]=Tmp2;
- }
- pen.dec_x(x);
- }
-
-}
-
-template<typename T> void
-gaussian_blur_5x5(T pen, int w, int h)
-{
- typename T::pointer SC0=new typename T::value_type[w+2];
- typename T::pointer SC1=new typename T::value_type[w+2];
- typename T::pointer SC2=new typename T::value_type[w+2];
- typename T::pointer SC3=new typename T::value_type[w+2];
-
- gaussian_blur_5x5_(pen,w,h,SC0,SC1,SC2,SC3);
-
- delete [] SC0;
- delete [] SC1;
- delete [] SC2;
- delete [] SC3;
-}
-
-template<typename T> void
-gaussian_blur_5x5(T begin, T end)
-{
- typename T::difference_type size(end-begin);
-
- typename T::pointer SC0=new typename T::value_type[size.x+2];
- typename T::pointer SC1=new typename T::value_type[size.x+2];
- typename T::pointer SC2=new typename T::value_type[size.x+2];
- typename T::pointer SC3=new typename T::value_type[size.x+2];
-
- gaussian_blur_5x5_(begin,size.x,size.y,SC0,SC1,SC2,SC3);
-
- delete [] SC0;
- delete [] SC1;
- delete [] SC2;
- delete [] SC3;
-}
-
-template<typename T> void
-gaussian_blur_3x3(T pen,int w, int h)
-{
- int x,y;
- typename T::value_type Tmp1,Tmp2,SR0,SR1;
-
-// typename T::iterator_x iter;
-
- typename T::pointer SC0=new typename T::value_type[w+1];
- typename T::pointer SC1=new typename T::value_type[w+1];
-
- // Setup the row buffers
- for(x=0;x<w;x++)SC0[x+1]=pen.x()[x]*4;
- memset(SC1,0,(w+1)*sizeof(typename T::value_type));
-
- for(y=0;y<h+1;y++,pen.inc_y())
- {
- int yadj;
- if(y>=h)
- {yadj=-1; SR1=SR0=pen.y()[yadj];}
- else
- {yadj=0; SR1=SR0=pen.get_value(); }
-
- for(x=0;x<w+1;x++,pen.inc_x())
- {
- if(x>=w)
- Tmp1=pen[yadj][(w-x)-2];
- else
- Tmp1=*pen[yadj];
-
- Tmp2=SR0+Tmp1;
- SR0=Tmp1;
- Tmp1=SR1+Tmp2;
- SR1=Tmp2;
-
- Tmp2=SC0[x]+Tmp1;
- SC0[x]=Tmp1;
- if(y&&x)
- pen[-1][-1]=(SC1[x]+Tmp2)/16;
- SC1[x]=Tmp2;
- }
- pen.dec_x(x);
- }
-
- delete [] SC0;
- delete [] SC1;
-}
-
-//! 2D 3x3 pixel gaussian blur
-template<typename _PEN> void
-gaussian_blur_3x3(_PEN begin, _PEN end)
-{
- typename _PEN::difference_type size(end-begin);
- gaussian_blur_3x3(begin,size.x,size.y);
-}
-
-//! 1D 3 pixel gaussian blur
-template<typename I> void
-gaussian_blur_3(I begin, I end, bool endpts = true)
-{
-// typedef typename I _itertype;
-// int i;
- typename std::iterator_traits<I>::value_type Tmp1,Tmp2,SR0,SR1;
-
- SR0=SR1=*begin;
- I iter,prev=begin;
- for(iter=begin;iter!=end;prev=iter++)
- {
- Tmp1=*iter;
- Tmp2=SR0+Tmp1;
- SR0=Tmp1;
- Tmp1=SR1+Tmp2;
- SR1=Tmp2;
- if(iter!=begin && ( endpts || (prev != begin) ))
- *prev=(Tmp1)/4;
- }
-
- if(endpts)
- {
- Tmp1=*prev;
- Tmp2=SR0+Tmp1;
- SR0=Tmp1;
- Tmp1=SR1+Tmp2;
- SR1=Tmp2;
- *prev=(Tmp1)/4;
- }
-}
-
-//! 2D 3x1 pixel gaussian blur
-template<typename _PEN> void
-gaussian_blur_3x1(_PEN begin, _PEN end)
-{
- typename _PEN::difference_type size=end-begin;
- for(;size.y>0;size.y--, begin.inc_y())
- gaussian_blur_3(begin.x(),begin.x()+size.x);
-}
-
-//! 2D 1x3 pixel gaussian blur
-template<typename _PEN> void
-gaussian_blur_1x3(_PEN begin, _PEN end)
-{
- typename _PEN::difference_type size=end-begin;
- for(;size.x>0;size.x--,begin.inc_x())
- gaussian_blur_3(begin.y(),begin.y()+size.y);
-}
-
-template<typename T> void
-gaussian_blur(T pen, int w, int h, int blur_x, int blur_y)
-{
- typename T::pointer SC0=new typename T::value_type[w+2];
- typename T::pointer SC1=new typename T::value_type[w+2];
- typename T::pointer SC2=new typename T::value_type[w+2];
- typename T::pointer SC3=new typename T::value_type[w+2];
-
- blur_x--;
- blur_y--;
-
- while(blur_x&&blur_y)
- {
- if(blur_x>=4 && blur_y>=4)
- {
- gaussian_blur_5x5_(pen,w,h,SC0,SC1,SC2,SC3);
- blur_x-=4,blur_y-=4;
- }
- else if(blur_x>=2 && blur_y>=2)
- {
- gaussian_blur_3x3(pen,w,h);
- blur_x-=2,blur_y-=2;
- }
- else
- blur_x--,blur_y--;
- }
- while(blur_x)
- {
- if(blur_x>=2)
- {
- gaussian_blur_3x1(pen,T(pen).move(w,h));
- blur_x-=2;
- }
- else
- blur_x--;
- }
- while(blur_y)
- {
- if(blur_y>=2)
- {
- gaussian_blur_1x3(pen,T(pen).move(w,h));
- blur_y-=2;
- }
- else
- blur_y--;
- }
-
- delete [] SC0;
- delete [] SC1;
- delete [] SC2;
- delete [] SC3;
-}
-
-template<typename T> void
-gaussian_blur(T begin, T end,int w, int h)
-{
- typename T::difference_type size(end-begin);
- gaussian_blur(begin,size.x,size.y,w,h);
-}
-
-template<typename T> void
-gaussian_blur(T begin, T end,int w)
-{
- typename T::difference_type size(end-begin);
- gaussian_blur(begin,size.x,size.y,w,w);
-}
-
-_ETL_END_NAMESPACE
-
-/* === E X T E R N S ======================================================= */
-
-/* === E N D =============================================================== */
-
-#endif
projects / synfig.git / blobdiff