diff options
Diffstat (limited to '')
-rw-r--r-- | src/object/filters/offset.cpp | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/src/object/filters/offset.cpp b/src/object/filters/offset.cpp new file mode 100644 index 0000000..b859598 --- /dev/null +++ b/src/object/filters/offset.cpp @@ -0,0 +1,155 @@ +// 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 : |