Remove ancient trunk folder from svn repository

[synfig.git] / synfig-core / src / modules / mod_filter / halftone.cpp

diff --git a/synfig-core/src/modules/mod_filter/halftone.cpp b/synfig-core/src/modules/mod_filter/halftone.cpp
new file mode 100644 (file)
index 0000000..8e8ba9e
--- /dev/null
+++ b/synfig-core/src/modules/mod_filter/halftone.cpp
@@ -0,0 +1,168 @@
+/* === S Y N F I G ========================================================= */
+/*!    \file halftone.cpp
+**     \brief blehh
+**
+**     $Id$
+**
+**     \legal
+**     Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
+**     Copyright (c) 2008 Chris Moore
+**
+**     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.
+**     \endlegal
+*/
+/* ========================================================================= */
+
+/* === H E A D E R S ======================================================= */
+
+#ifdef USING_PCH
+#      include "pch.h"
+#else
+#ifdef HAVE_CONFIG_H
+#      include <config.h>
+#endif
+
+#include "halftone.h"
+
+#endif
+
+/* === M A C R O S ========================================================= */
+
+using namespace synfig;
+using namespace std;
+using namespace etl;
+
+/* === G L O B A L S ======================================================= */
+
+
+/* === P R O C E D U R E S ================================================= */
+
+#define SQRT2  (1.414213562f)
+
+/* === M E T H O D S ======================================================= */
+
+float
+Halftone::operator()(const Point &point, const float& luma, float supersample)const
+{
+       float halftone(mask(point));
+
+       if(supersample>=0.5f)
+               supersample=0.4999999999f;
+
+       halftone=(halftone-0.5f)*(1.0f-supersample*2.0f)+0.5f;
+
+       const float diff(halftone-luma);
+
+       if(supersample)
+       {
+               const float amount(diff/(supersample*2.0f)+0.5f);
+
+               if(amount<=0.0f+0.01f)
+                       return 1.0f;
+               else if(amount>=1.0f-0.01f)
+                       return 0.0f;
+               else
+                       return 1.0f-amount;
+       }
+       else
+       {
+               if(diff>=0)
+                       return 0.0f;
+               else
+                       return 1.0f;
+       }
+
+       return 0.0f;
+}
+
+float
+Halftone::mask(synfig::Point point)const
+{
+       float radius1;
+       float radius2;
+
+       point-=origin;
+
+       {
+               const float     a(Angle::sin(-angle).get()),    b(Angle::cos(-angle).get());
+               const float     u(point[0]),v(point[1]);
+
+               point[0]=b*u-a*v;
+               point[1]=a*u+b*v;
+       }
+
+       if(type==TYPE_STRIPE)
+       {
+               Point pnt(fmod(point[0],size[0]),fmod(point[1],size[1]));
+               while(pnt[0]<0)pnt[0]+=abs(size[0]);
+               while(pnt[1]<0)pnt[1]+=abs(size[1]);
+
+               float x(pnt[1]/size[1]);
+               if(x>0.5)x=1.0-x;
+               x*=2;
+               return x;
+       }
+
+       {
+               Point pnt(fmod(point[0],size[0]),fmod(point[1],size[1]));
+               while(pnt[0]<0)pnt[0]+=abs(size[0]);
+               while(pnt[1]<0)pnt[1]+=abs(size[1]);
+               pnt-=Vector(size[0]*0.5,size[1]*0.5);
+               pnt*=2.0;
+               pnt[0]/=size[0];
+               pnt[1]/=size[1];
+
+               radius1=pnt.mag()/SQRT2;
+               radius1*=radius1;
+       }
+       if(type==TYPE_DARKONLIGHT || type== TYPE_LIGHTONDARK)
+               return radius1;
+
+       {
+               Point pnt(fmod(point[0]+size[0]*0.5,size[0]),fmod(point[1]+size[0]*0.5,size[1]));
+               while(pnt[0]<0)pnt[0]+=abs(size[0]);
+               while(pnt[1]<0)pnt[1]+=abs(size[1]);
+               pnt-=Vector(size[0]*0.5,size[1]*0.5);
+               pnt*=2.0;
+               pnt[0]/=size[0];
+               pnt[1]/=size[1];
+
+               radius2=pnt.mag()/SQRT2;
+               radius2*=radius2;
+       }
+
+       if(type==TYPE_DIAMOND)
+       {
+               //return (radius1+(1.0f-radius2))*0.5;
+               float x((radius1+(1.0f-radius2))*0.5);
+               //float x(((radius2-radius1)*((radius1+(1.0f-radius2))*0.5)+radius1)*2.0f);
+               x-=0.5;
+               x*=2.0;
+               if(x<0)x=-sqrt(-x);else x=sqrt(x);
+               x*=1.01f;
+               x/=2.0;
+               x+=0.5;
+               return x;
+       }
+
+       if(type==TYPE_SYMMETRIC)
+       {
+               float x(((radius2-radius1)*((radius1+(1.0f-radius2))*0.5)+radius1)*2.0f);
+               x-=0.5;
+               x*=2.0;
+               if(x<0)x=-sqrt(-x);else x=sqrt(x);
+               x*=1.01f;
+               x/=2.0;
+               x+=0.5;
+               return x;
+       }
+       return 0;
+}