X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=synfig-core%2Fsrc%2Fmodules%2Fmod_filter%2Fhalftone.cpp;fp=synfig-core%2Fsrc%2Fmodules%2Fmod_filter%2Fhalftone.cpp;h=8e8ba9e7b3a5309b8887f1710332e1564a8da754;hb=a095981e18cc37a8ecc7cd237cc22b9c10329264;hp=0000000000000000000000000000000000000000;hpb=9459638ad6797b8139f1e9f0715c96076dbf0890;p=synfig.git

diff --git a/synfig-core/src/modules/mod_filter/halftone.cpp b/synfig-core/src/modules/mod_filter/halftone.cpp
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+++ b/synfig-core/src/modules/mod_filter/halftone.cpp
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+/* === 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;
+}