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Diffstat (limited to 'src/object/filters/gaussian-blur.cpp')
-rw-r--r-- | src/object/filters/gaussian-blur.cpp | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/src/object/filters/gaussian-blur.cpp b/src/object/filters/gaussian-blur.cpp new file mode 100644 index 0000000..c8460d0 --- /dev/null +++ b/src/object/filters/gaussian-blur.cpp @@ -0,0 +1,150 @@ +// 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 : |