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Diffstat (limited to 'src/object/filters/morphology.cpp')
| -rw-r--r-- | src/object/filters/morphology.cpp | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/src/object/filters/morphology.cpp b/src/object/filters/morphology.cpp new file mode 100644 index 0000000..3ed87a9 --- /dev/null +++ b/src/object/filters/morphology.cpp @@ -0,0 +1,185 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/** \file + * SVG <feMorphology> implementation. + * + */ +/* + * Authors: + * Felipe Sanches <juca@members.fsf.org> + * Hugo Rodrigues <haa.rodrigues@gmail.com> + * Abhishek Sharma + * + * Copyright (C) 2006 Hugo Rodrigues + * + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include <cstring> + +#include "attributes.h" +#include "svg/svg.h" +#include "morphology.h" +#include "xml/repr.h" +#include "display/nr-filter.h" + +SPFeMorphology::SPFeMorphology() : SPFilterPrimitive() { + this->Operator = Inkscape::Filters::MORPHOLOGY_OPERATOR_ERODE; + + //Setting default values: + this->radius.set("0"); +} + +SPFeMorphology::~SPFeMorphology() = default; + +/** + * Reads the Inkscape::XML::Node, and initializes SPFeMorphology 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 SPFeMorphology::build(SPDocument *document, Inkscape::XML::Node *repr) { + SPFilterPrimitive::build(document, repr); + + /*LOAD ATTRIBUTES FROM REPR HERE*/ + this->readAttr(SPAttr::OPERATOR); + this->readAttr(SPAttr::RADIUS); +} + +/** + * Drops any allocated memory. + */ +void SPFeMorphology::release() { + SPFilterPrimitive::release(); +} + +static Inkscape::Filters::FilterMorphologyOperator sp_feMorphology_read_operator(gchar const *value){ + if (!value) { + return Inkscape::Filters::MORPHOLOGY_OPERATOR_ERODE; //erode is default + } + + switch(value[0]){ + case 'e': + if (strncmp(value, "erode", 5) == 0) { + return Inkscape::Filters::MORPHOLOGY_OPERATOR_ERODE; + } + break; + case 'd': + if (strncmp(value, "dilate", 6) == 0) { + return Inkscape::Filters::MORPHOLOGY_OPERATOR_DILATE; + } + break; + } + + return Inkscape::Filters::MORPHOLOGY_OPERATOR_ERODE; //erode is default +} + +/** + * Sets a specific value in the SPFeMorphology. + */ +void SPFeMorphology::set(SPAttr key, gchar const *value) { + Inkscape::Filters::FilterMorphologyOperator read_operator; + + switch(key) { + /*DEAL WITH SETTING ATTRIBUTES HERE*/ + case SPAttr::OPERATOR: + read_operator = sp_feMorphology_read_operator(value); + + if (read_operator != this->Operator){ + this->Operator = read_operator; + this->parent->requestModified(SP_OBJECT_MODIFIED_FLAG); + } + break; + case SPAttr::RADIUS: + this->radius.set(value); + + //From SVG spec: If <y-radius> is not provided, it defaults to <x-radius>. + if (this->radius.optNumIsSet() == false) { + this->radius.setOptNumber(this->radius.getNumber()); + } + + this->parent->requestModified(SP_OBJECT_MODIFIED_FLAG); + break; + default: + SPFilterPrimitive::set(key, value); + break; + } + +} + +/** + * Receives update notifications. + */ +void SPFeMorphology::update(SPCtx *ctx, guint flags) { + if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG | + SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) { + + /* do something to trigger redisplay, updates? */ + + } + + SPFilterPrimitive::update(ctx, flags); +} + +/** + * Writes its settings to an incoming repr object, if any. + */ +Inkscape::XML::Node* SPFeMorphology::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 SPFeMorphology::build_renderer(Inkscape::Filters::Filter* filter) { + g_assert(filter != nullptr); + + int primitive_n = filter->add_primitive(Inkscape::Filters::NR_FILTER_MORPHOLOGY); + Inkscape::Filters::FilterPrimitive *nr_primitive = filter->get_primitive(primitive_n); + Inkscape::Filters::FilterMorphology *nr_morphology = dynamic_cast<Inkscape::Filters::FilterMorphology*>(nr_primitive); + g_assert(nr_morphology != nullptr); + + this->renderer_common(nr_primitive); + + nr_morphology->set_operator(this->Operator); + nr_morphology->set_xradius( this->radius.getNumber() ); + nr_morphology->set_yradius( this->radius.getOptNumber() ); +} + +/** + * Calculate the region taken up by a mophoplogy primitive + * + * @param region The original shape's region or previous primitive's region output. + */ +Geom::Rect SPFeMorphology::calculate_region(Geom::Rect region) +{ + auto r = region; + if (Operator == Inkscape::Filters::MORPHOLOGY_OPERATOR_DILATE) { + if (radius.optNumIsSet()) { + r.expandBy(radius.getNumber(), radius.getOptNumber()); + } else { + r.expandBy(radius.getNumber()); + } + } else if (Operator == Inkscape::Filters::MORPHOLOGY_OPERATOR_ERODE) { + if (radius.optNumIsSet()) { + r.expandBy(-1 * radius.getNumber(), -1 * radius.getOptNumber()); + } else { + r.expandBy(-1 * radius.getNumber()); + } + } + return r; +} + +/* + 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 : |