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// SPDX-License-Identifier: GPL-2.0-or-later
/** \file
* SVG <feOffset> 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 <2geom/transforms.h>
#include "offset.h"
#include "attributes.h"
#include "helper-fns.h"
#include "display/nr-filter.h"
#include "display/nr-filter-offset.h"
#include "svg/svg.h"
#include "xml/repr.h"
SPFeOffset::SPFeOffset() : SPFilterPrimitive() {
this->dx = 0;
this->dy = 0;
}
SPFeOffset::~SPFeOffset() = default;
/**
* Reads the Inkscape::XML::Node, and initializes SPFeOffset 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 SPFeOffset::build(SPDocument *document, Inkscape::XML::Node *repr) {
SPFilterPrimitive::build(document, repr);
this->readAttr(SPAttr::DX);
this->readAttr(SPAttr::DY);
}
/**
* Drops any allocated memory.
*/
void SPFeOffset::release() {
SPFilterPrimitive::release();
}
/**
* Sets a specific value in the SPFeOffset.
*/
void SPFeOffset::set(SPAttr key, gchar const *value) {
double read_num;
switch(key) {
case SPAttr::DX:
read_num = value ? helperfns_read_number(value) : 0;
if (read_num != this->dx) {
this->dx = read_num;
this->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
}
break;
case SPAttr::DY:
read_num = value ? helperfns_read_number(value) : 0;
if (read_num != this->dy) {
this->dy = read_num;
this->parent->requestModified(SP_OBJECT_MODIFIED_FLAG);
}
break;
/*DEAL WITH SETTING ATTRIBUTES HERE*/
default:
SPFilterPrimitive::set(key, value);
break;
}
}
/**
* Receives update notifications.
*/
void SPFeOffset::update(SPCtx *ctx, guint flags) {
if (flags & SP_OBJECT_MODIFIED_FLAG) {
this->readAttr(SPAttr::DX);
this->readAttr(SPAttr::DY);
}
SPFilterPrimitive::update(ctx, flags);
}
/**
* Writes its settings to an incoming repr object, if any.
*/
Inkscape::XML::Node* SPFeOffset::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 SPFeOffset::build_renderer(Inkscape::Filters::Filter* filter) {
g_assert(filter != nullptr);
int primitive_n = filter->add_primitive(Inkscape::Filters::NR_FILTER_OFFSET);
Inkscape::Filters::FilterPrimitive *nr_primitive = filter->get_primitive(primitive_n);
Inkscape::Filters::FilterOffset *nr_offset = dynamic_cast<Inkscape::Filters::FilterOffset*>(nr_primitive);
g_assert(nr_offset != nullptr);
this->renderer_common(nr_primitive);
nr_offset->set_dx(this->dx);
nr_offset->set_dy(this->dy);
}
/**
* Calculate the region taken up by an offset
*
* @param region The original shape's region or previous primitive's region output.
*/
Geom::Rect SPFeOffset::calculate_region(Geom::Rect region)
{
// Because blur calculates its drawing space based on the resulting region
// An offset will actually harm blur's ability to draw, even though it shouldn't
// A future fix would require the blur to figure out its region minus any downstream
// offset (this effects drop-shadows)
// TODO: region *= Geom::Translate(this->dx, this->dy);
region.unionWith(region * Geom::Translate(this->dx, this->dy));
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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