/* === S Y N F I G ========================================================= */
/*! \file layer_motionblur.cpp
** \brief Implementation of the "Motion Blur" layer
**
** $Id$
**
** \legal
** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
** Copyright (c) 2007, 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 "layer_motionblur.h"
#include <synfig/general.h>
#include <synfig/localization.h>
#include <synfig/canvas.h>
#include <synfig/context.h>
#include <synfig/paramdesc.h>
#include <synfig/renddesc.h>
#include <synfig/string.h>
#include <synfig/surface.h>
#include <synfig/time.h>
#include <synfig/value.h>
#include <synfig/valuenode.h>
#include <synfig/rendering/common/task/taskblend.h>
#endif
/* === U S I N G =========================================================== */
using namespace synfig;
using namespace etl;
using namespace std;
/* === G L O B A L S ======================================================= */
SYNFIG_LAYER_INIT(Layer_MotionBlur);
SYNFIG_LAYER_SET_NAME(Layer_MotionBlur,"MotionBlur"); // todo: use motion_blur
SYNFIG_LAYER_SET_LOCAL_NAME(Layer_MotionBlur,N_("Motion Blur"));
SYNFIG_LAYER_SET_CATEGORY(Layer_MotionBlur,N_("Blurs"));
SYNFIG_LAYER_SET_VERSION(Layer_MotionBlur,"0.1");
SYNFIG_LAYER_SET_CVS_ID(Layer_MotionBlur,"$Id$");
/* === M E M B E R S ======================================================= */
Layer_MotionBlur::Layer_MotionBlur():
Layer_CompositeFork (1.0,Color::BLEND_STRAIGHT),
param_aperture (ValueBase(Time(1.0))),
param_subsamples_factor (ValueBase(Real(1.0))),
param_subsampling_type (ValueBase(int(SUBSAMPLING_HYPERBOLIC))),
param_subsample_start (ValueBase(Real(0.0))),
param_subsample_end (ValueBase(Real(1.0)))
{
}
bool
Layer_MotionBlur::set_param(const String ¶m, const ValueBase &value)
{
IMPORT_VALUE(param_aperture);
IMPORT_VALUE(param_subsamples_factor);
IMPORT_VALUE(param_subsampling_type);
IMPORT_VALUE(param_subsample_start);
IMPORT_VALUE(param_subsample_end);
return Layer_Composite::set_param(param,value);
}
ValueBase
Layer_MotionBlur::get_param(const String ¶m)const
{
EXPORT_VALUE(param_aperture);
EXPORT_VALUE(param_subsamples_factor);
EXPORT_VALUE(param_subsampling_type);
EXPORT_VALUE(param_subsample_start);
EXPORT_VALUE(param_subsample_end);
EXPORT_NAME();
EXPORT_VERSION();
return Layer_Composite::get_param(param);
}
Color
Layer_MotionBlur::get_color(Context context, const Point &pos)const
{
/* if(aperture)
{
Time time(get_time_mark());
time+=(Vector::value_type)( (signed)(RAND_MAX/2)-(signed)rand() )/(Vector::value_type)(RAND_MAX) *aperture -aperture*0.5;
context.set_time(time, pos);
}
*/
return context.get_color(pos);
}
Layer::Vocab
Layer_MotionBlur::get_param_vocab()const
{
Layer::Vocab ret;
//ret=Layer_Composite::get_param_vocab();
ret.push_back(ParamDesc("aperture")
.set_local_name(_("Aperture"))
.set_description(_("Shutter Time"))
);
ret.push_back(ParamDesc("subsamples_factor")
.set_local_name(_("Subsamples Factor"))
.set_description(_("Multiplies The Number Of Subsamples Rendered"))
);
ret.push_back(ParamDesc("subsampling_type")
.set_local_name(_("Subsampling Type"))
.set_description(_("Curve Type For Weighting Subsamples"))
.set_hint("enum")
.add_enum_value(SUBSAMPLING_CONSTANT,"constant",_("Constant"))
.add_enum_value(SUBSAMPLING_LINEAR,"linear",_("Linear"))
.add_enum_value(SUBSAMPLING_HYPERBOLIC,"hyperbolic",_("Hyperbolic"))
);
ret.push_back(ParamDesc("subsample_start")
.set_local_name(_("Subsample Start Amount"))
.set_description(_("Relative Amount Of The First Subsample, For Linear Weighting"))
);
ret.push_back(ParamDesc("subsample_end")
.set_local_name(_("Subsample End Amount"))
.set_description(_("Relative Amount Of The Last Subsample, For Linear Weighting"))
);
return ret;
}
rendering::Task::Handle
Layer_MotionBlur::build_rendering_task_vfunc(Context context) const
{
const Real precision = 1e-8;
Time aperture = param_aperture.get(Time());
Real subsamples_factor = param_subsamples_factor.get(Real());
SubsamplingType subsampling_type = (SubsamplingType)param_subsampling_type.get(int());
Real subsample_start = param_subsample_start.get(Real());
Real subsample_end = param_subsample_end.get(Real());
int samples = (int)round(12.0 * fabs(subsamples_factor));
if (samples <= 1)
return context.build_rendering_task();
// Only in modes where subsample_start/end matters...
if (subsampling_type == SUBSAMPLING_LINEAR)
{
// We won't render when the scale==0, so we'll use those samples elsewhere
if (fabs(subsample_start) < precision) ++samples;
if (fabs(subsample_end) < precision) ++samples;
}
vector<Real> scales(samples, 0.0);
Real sum = 0.0;
for(int i = 0; i < samples; i++)
{
Real pos = (Real)i/(Real)(samples - 1);
Real ipos = 1.0 - pos;
Real scale = 0.0;
switch(subsampling_type)
{
case SUBSAMPLING_LINEAR:
scale = ipos*subsample_start + pos*subsample_end;
break;
case SUBSAMPLING_HYPERBOLIC:
scale = 1.0/(samples - i);
break;
case SUBSAMPLING_CONSTANT:
default:
scale = 1.0; // Weights don't matter for constant overall subsampling.
break;
}
scales[i] = scale;
sum += scale;
}
Real k = 1.0/sum;
rendering::Task::Handle task;
for(int i = 0; i < samples; i++)
{
if (fabs(scales[i]*k) < 1e-8)
continue;
Real pos = (Real)i/(Real)(samples - 1);
Real ipos = 1.0 - pos;
context.set_time(get_time_mark() - aperture*ipos);
rendering::TaskBlend::Handle task_blend(new rendering::TaskBlend());
task_blend->amount = scales[i]*k;
task_blend->blend_method = Color::BLEND_ADD_COMPOSITE;
task_blend->sub_task_a() = task;
task_blend->sub_task_b() = context.build_rendering_task();
task = task_blend;
}
return task;
}