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// SPDX-License-Identifier: GPL-2.0-or-later
/** \file
* SVG <gaussianBlur> implementation.
*
*/
/*
* Authors:
* Hugo Rodrigues <haa.rodrigues@gmail.com>
* Niko Kiirala <niko@kiirala.com>
* Abhishek Sharma
*
* Copyright (C) 2006,2007 Authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "gaussian-blur.h"
#include "attributes.h"
#include "display/nr-filter.h"
#include "display/nr-filter-gaussian.h"
#include "svg/svg.h"
#include "xml/repr.h"
SPGaussianBlur::SPGaussianBlur() : SPFilterPrimitive() {
}
SPGaussianBlur::~SPGaussianBlur() = default;
/**
* Reads the Inkscape::XML::Node, and initializes SPGaussianBlur variables. For this to get called,
* our name must be associated with a repr via "sp_object_type_register". Best done through
* sp-object-repr.cpp's repr_name_entries array.
*/
void SPGaussianBlur::build(SPDocument *document, Inkscape::XML::Node *repr) {
SPFilterPrimitive::build(document, repr);
this->readAttr(SPAttr::STDDEVIATION);
}
/**
* Drops any allocated memory.
*/
void SPGaussianBlur::release() {
SPFilterPrimitive::release();
}
/**
* Sets a specific value in the SPGaussianBlur.
*/
void SPGaussianBlur::set(SPAttr key, gchar const *value) {
switch(key) {
case SPAttr::STDDEVIATION:
this->stdDeviation.set(value);
this->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
break;
default:
SPFilterPrimitive::set(key, value);
break;
}
}
/**
* Receives update notifications.
*/
void SPGaussianBlur::update(SPCtx *ctx, guint flags) {
if (flags & SP_OBJECT_MODIFIED_FLAG) {
this->readAttr(SPAttr::STDDEVIATION);
}
SPFilterPrimitive::update(ctx, flags);
}
/**
* Writes its settings to an incoming repr object, if any.
*/
Inkscape::XML::Node* SPGaussianBlur::write(Inkscape::XML::Document *doc, Inkscape::XML::Node *repr, guint flags) {
/* TODO: Don't just clone, but create a new repr node and write all
* relevant values into it */
if (!repr) {
repr = this->getRepr()->duplicate(doc);
}
SPFilterPrimitive::write(doc, repr, flags);
return repr;
}
void sp_gaussianBlur_setDeviation(SPGaussianBlur *blur, float num)
{
blur->stdDeviation.setNumber(num);
}
void sp_gaussianBlur_setDeviation(SPGaussianBlur *blur, float num, float optnum)
{
blur->stdDeviation.setNumber(num);
blur->stdDeviation.setOptNumber(optnum);
}
void SPGaussianBlur::build_renderer(Inkscape::Filters::Filter* filter) {
int handle = filter->add_primitive(Inkscape::Filters::NR_FILTER_GAUSSIANBLUR);
Inkscape::Filters::FilterPrimitive *nr_primitive = filter->get_primitive(handle);
Inkscape::Filters::FilterGaussian *nr_blur = dynamic_cast<Inkscape::Filters::FilterGaussian*>(nr_primitive);
this->renderer_common(nr_primitive);
gfloat num = this->stdDeviation.getNumber();
if (num >= 0.0) {
gfloat optnum = this->stdDeviation.getOptNumber();
if(optnum >= 0.0) {
nr_blur->set_deviation((double) num, (double) optnum);
} else {
nr_blur->set_deviation((double) num);
}
}
}
/* Calculate the region taken up by gaussian blur
*
* @param region The original shape's region or previous primitive's region output.
*/
Geom::Rect SPGaussianBlur::calculate_region(Geom::Rect region)
{
double x = this->stdDeviation.getNumber();
double y = this->stdDeviation.getOptNumber();
if (y == -1.0)
y = x;
// If not within the default 10% margin (see
// http://www.w3.org/TR/SVG11/filters.html#FilterEffectsRegion), specify margins
// The 2.4 is an empirical coefficient: at that distance the cutoff is practically invisible
// (the opacity at 2.4 * radius is about 3e-3)
region.expandBy(2.4 * x, 2.4 * y);
return region;
}
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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