--- /dev/null
+/* === S Y N F I G ========================================================= */
+/*! \file lineargradient.cpp
+** \brief Implementation of the "Linear Gradient" layer
+**
+** $Id$
+**
+** \legal
+** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
+**
+** 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
+**
+** === N O T E S ===========================================================
+**
+** ========================================================================= */
+
+/* === H E A D E R S ======================================================= */
+
+#ifdef USING_PCH
+# include "pch.h"
+#else
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "lineargradient.h"
+
+#include <synfig/string.h>
+#include <synfig/time.h>
+#include <synfig/context.h>
+#include <synfig/paramdesc.h>
+#include <synfig/renddesc.h>
+#include <synfig/surface.h>
+#include <synfig/value.h>
+#include <synfig/valuenode.h>
+
+#endif
+
+/* === M A C R O S ========================================================= */
+
+/* === G L O B A L S ======================================================= */
+
+SYNFIG_LAYER_INIT(LinearGradient);
+SYNFIG_LAYER_SET_NAME(LinearGradient,"linear_gradient");
+SYNFIG_LAYER_SET_LOCAL_NAME(LinearGradient,N_("Linear Gradient"));
+SYNFIG_LAYER_SET_CATEGORY(LinearGradient,N_("Gradients"));
+SYNFIG_LAYER_SET_VERSION(LinearGradient,"0.0");
+SYNFIG_LAYER_SET_CVS_ID(LinearGradient,"$Id$");
+
+/* === P R O C E D U R E S ================================================= */
+
+/* === M E T H O D S ======================================================= */
+
+inline void
+LinearGradient::sync()
+{
+ diff=(p2-p1);
+ const Real mag(diff.inv_mag());
+ diff*=mag*mag;
+}
+
+
+LinearGradient::LinearGradient():
+ p1(1,1),
+ p2(-1,-1),
+ gradient(Color::black(), Color::white()),
+ loop(false),
+ zigzag(false)
+{
+ sync();
+}
+
+inline Color
+LinearGradient::color_func(const Point &point, float supersample)const
+{
+ Real dist(point*diff-p1*diff);
+
+ if(loop)
+ dist-=floor(dist);
+
+ if(zigzag)
+ {
+ dist*=2.0;
+ supersample*=2.0;
+ if(dist>1)dist=2.0-dist;
+ }
+
+ if(loop)
+ {
+ if(dist+supersample*0.5>1.0)
+ {
+ float left(supersample*0.5-(dist-1.0));
+ float right(supersample*0.5+(dist-1.0));
+ Color pool(gradient(1.0-(left*0.5),left).premult_alpha()*left/supersample);
+ if (zigzag) pool+=gradient(1.0-right*0.5,right).premult_alpha()*right/supersample;
+ else pool+=gradient(right*0.5,right).premult_alpha()*right/supersample;
+ return pool.demult_alpha();
+ }
+ if(dist-supersample*0.5<0.0)
+ {
+ float left(supersample*0.5-dist);
+ float right(supersample*0.5+dist);
+ Color pool(gradient(right*0.5,right).premult_alpha()*right/supersample);
+ if (zigzag) pool+=gradient(left*0.5,left).premult_alpha()*left/supersample;
+ else pool+=gradient(1.0-left*0.5,left).premult_alpha()*left/supersample;
+ return pool.demult_alpha();
+ }
+ }
+ return gradient(dist,supersample);
+}
+
+float
+LinearGradient::calc_supersample(const synfig::Point &/*x*/, float pw,float /*ph*/)const
+{
+ return pw/(p2-p1).mag();
+}
+
+synfig::Layer::Handle
+LinearGradient::hit_check(synfig::Context context, const synfig::Point &point)const
+{
+ if(get_blend_method()==Color::BLEND_STRAIGHT && get_amount()>=0.5)
+ return const_cast<LinearGradient*>(this);
+ if(get_amount()==0.0)
+ return context.hit_check(point);
+ if((get_blend_method()==Color::BLEND_STRAIGHT || get_blend_method()==Color::BLEND_COMPOSITE) && color_func(point).get_a()>0.5)
+ return const_cast<LinearGradient*>(this);
+ return context.hit_check(point);
+}
+
+bool
+LinearGradient::set_param(const String & param, const ValueBase &value)
+{
+ if(param=="p1" && value.same_type_as(p1))
+ {
+ p1=value.get(p1);
+ sync();
+ return true;
+ }
+ if(param=="p2" && value.same_type_as(p2))
+ {
+ p2=value.get(p2);
+ sync();
+ return true;
+ }
+ //IMPORT(p1);
+ //IMPORT(p2);
+
+
+ IMPORT(gradient);
+ IMPORT(loop);
+ IMPORT(zigzag);
+ return Layer_Composite::set_param(param,value);
+}
+
+ValueBase
+LinearGradient::get_param(const String & param)const
+{
+ EXPORT(p1);
+ EXPORT(p2);
+ EXPORT(gradient);
+ EXPORT(loop);
+ EXPORT(zigzag);
+
+ EXPORT_NAME();
+ EXPORT_VERSION();
+
+ return Layer_Composite::get_param(param);
+}
+
+Layer::Vocab
+LinearGradient::get_param_vocab()const
+{
+ Layer::Vocab ret(Layer_Composite::get_param_vocab());
+
+ ret.push_back(ParamDesc("p1")
+ .set_local_name(_("Point 1"))
+ .set_connect("p2")
+ );
+ ret.push_back(ParamDesc("p2")
+ .set_local_name(_("Point 2"))
+ );
+ ret.push_back(ParamDesc("gradient")
+ .set_local_name(_("Gradient"))
+ );
+ ret.push_back(ParamDesc("loop")
+ .set_local_name(_("Loop"))
+ );
+ ret.push_back(ParamDesc("zigzag")
+ .set_local_name(_("ZigZag"))
+ );
+
+ return ret;
+}
+
+Color
+LinearGradient::get_color(Context context, const Point &point)const
+{
+ const Color color(color_func(point));
+
+ if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
+ return color;
+ else
+ return Color::blend(color,context.get_color(point),get_amount(),get_blend_method());
+}
+
+bool
+LinearGradient::accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const
+{
+ SuperCallback supercb(cb,0,9500,10000);
+
+ if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
+ {
+ surface->set_wh(renddesc.get_w(),renddesc.get_h());
+ }
+ else
+ {
+ if(!context.accelerated_render(surface,quality,renddesc,&supercb))
+ return false;
+ if(get_amount()==0)
+ return true;
+ }
+
+
+ int x,y;
+
+ Surface::pen pen(surface->begin());
+ const Real pw(renddesc.get_pw()),ph(renddesc.get_ph());
+ Point pos;
+ Point tl(renddesc.get_tl());
+ const int w(surface->get_w());
+ const int h(surface->get_h());
+
+ if(get_amount()==1.0 && get_blend_method()==Color::BLEND_STRAIGHT)
+ {
+ for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
+ for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
+ pen.put_value(color_func(pos,calc_supersample(pos,pw,ph)));
+ }
+ else
+ {
+ for(y=0,pos[1]=tl[1];y<h;y++,pen.inc_y(),pen.dec_x(x),pos[1]+=ph)
+ for(x=0,pos[0]=tl[0];x<w;x++,pen.inc_x(),pos[0]+=pw)
+ pen.put_value(Color::blend(color_func(pos,calc_supersample(pos,pw,ph)),pen.get_value(),get_amount(),get_blend_method()));
+ }
+
+ // Mark our progress as finished
+ if(cb && !cb->amount_complete(10000,10000))
+ return false;
+
+ return true;
+}
projects / synfig.git / blobdiff