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Diffstat (limited to '')
-rw-r--r-- | src/display/nr-filter-gaussian.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/src/display/nr-filter-gaussian.h b/src/display/nr-filter-gaussian.h new file mode 100644 index 0000000..28ffb00 --- /dev/null +++ b/src/display/nr-filter-gaussian.h @@ -0,0 +1,84 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +#ifndef SEEN_NR_FILTER_GAUSSIAN_H +#define SEEN_NR_FILTER_GAUSSIAN_H + +/* + * Gaussian blur renderer + * + * Authors: + * Niko Kiirala <niko@kiirala.com> + * bulia byak + * Jasper van de Gronde <th.v.d.gronde@hccnet.nl> + * + * Copyright (C) 2006 authors + * + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include <2geom/forward.h> +#include "display/nr-filter-primitive.h" + +enum { + BLUR_QUALITY_BEST = 2, + BLUR_QUALITY_BETTER = 1, + BLUR_QUALITY_NORMAL = 0, + BLUR_QUALITY_WORSE = -1, + BLUR_QUALITY_WORST = -2 +}; + +namespace Inkscape { +namespace Filters { + +class FilterGaussian : public FilterPrimitive { +public: + FilterGaussian(); + static FilterPrimitive *create(); + ~FilterGaussian() override; + + void render_cairo(FilterSlot &slot) override; + void area_enlarge(Geom::IntRect &area, Geom::Affine const &m) override; + bool can_handle_affine(Geom::Affine const &m) override; + double complexity(Geom::Affine const &ctm) override; + + /** + * Set the standard deviation value for gaussian blur. Deviation along + * both axis is set to the provided value. + * Negative value, NaN and infinity are considered an error and no + * changes to filter state are made. If not set, default value of zero + * is used, which means the filter results in transparent black image. + */ + void set_deviation(double deviation); + /** + * Set the standard deviation value for gaussian blur. First parameter + * sets the deviation alogn x-axis, second along y-axis. + * Negative value, NaN and infinity are considered an error and no + * changes to filter state are made. If not set, default value of zero + * is used, which means the filter results in transparent black image. + */ + void set_deviation(double x, double y); + + Glib::ustring name() override { return Glib::ustring("Gaussian Blur"); } + +private: + double _deviation_x; + double _deviation_y; +}; + + +} /* namespace Filters */ +} /* namespace Inkscape */ + + + + +#endif /* __NR_FILTER_GAUSSIAN_H__ */ +/* + 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 : |