// SPDX-License-Identifier: GPL-2.0-or-later /* * SVG filters rendering * * Author: * Niko Kiirala * Tavmjong Bah (primitive subregion) * * Copyright (C) 2006 Niko Kiirala * * Released under GNU GPL v2+, read the file 'COPYING' for more information. */ #include "display/nr-filter-primitive.h" #include "display/nr-filter-slot.h" #include "display/nr-filter-types.h" #include "svg/svg-length.h" #include "inkscape.h" #include "desktop.h" #include "document.h" #include "style.h" namespace Inkscape { namespace Filters { using Geom::X; using Geom::Y; FilterPrimitive::FilterPrimitive() { _input = NR_FILTER_SLOT_NOT_SET; _output = NR_FILTER_SLOT_NOT_SET; // Primitive subregion, should default to the union of all subregions of referenced nodes // (i.e. other filter primitives except feTile). If no referenced nodes, defaults to filter // region expressed in percent. At the moment, we do not check referenced nodes. // We must keep track if a value is set or not, if not set then the region defaults to 0%, 0%, // 100%, 100% ("x", "y", "width", "height") of the -> filter <- region. If set, then // percentages are in terms of bounding box or viewbox, depending on value of "primitiveUnits". // NB: SVGLength.set takes prescaled percent values: 1 means 100% _subregion_x.unset(SVGLength::PERCENT, 0, 0); _subregion_y.unset(SVGLength::PERCENT, 0, 0); _subregion_width.unset(SVGLength::PERCENT, 1, 0); _subregion_height.unset(SVGLength::PERCENT, 1, 0); _style = nullptr; } FilterPrimitive::~FilterPrimitive() { if(_style) sp_style_unref(_style); } void FilterPrimitive::render_cairo(FilterSlot &slot) { // passthrough cairo_surface_t *in = slot.getcairo(_input); slot.set(_output, in); } void FilterPrimitive::area_enlarge(Geom::IntRect &/*area*/, Geom::Affine const &/*m*/) { // This doesn't need to do anything by default } void FilterPrimitive::set_input(int slot) { set_input(0, slot); } void FilterPrimitive::set_input(int input, int slot) { if (input == 0) _input = slot; } void FilterPrimitive::set_output(int slot) { if (slot >= 0) _output = slot; } // We need to copy reference even if unset as we need to know if // someone has unset a value. void FilterPrimitive::set_x(SVGLength const &length) { _subregion_x = length; } void FilterPrimitive::set_y(SVGLength const &length) { _subregion_y = length; } void FilterPrimitive::set_width(SVGLength const &length) { _subregion_width = length; } void FilterPrimitive::set_height(SVGLength const &length) { _subregion_height = length; } void FilterPrimitive::set_subregion(SVGLength const &x, SVGLength const &y, SVGLength const &width, SVGLength const &height) { _subregion_x = x; _subregion_y = y; _subregion_width = width; _subregion_height = height; } Geom::Rect FilterPrimitive::filter_primitive_area(FilterUnits const &units) { Geom::OptRect const fa_opt = units.get_filter_area(); if (!fa_opt) { std::cerr << "FilterPrimitive::filter_primitive_area: filter area undefined." << std::endl; return Geom::Rect (Geom::Point(0.,0.), Geom::Point(0.,0.)); } Geom::Rect fa = *fa_opt; // x, y, width, and height are independently defined (i.e. one can be defined, by default, to // the filter area (via default value ) while another is defined relative to the bounding // box). It is better to keep track of them separately and then compose the Rect at the end. double x = 0; double y = 0; double width = 0; double height = 0; // If subregion not set, by special case use filter region. if( !_subregion_x._set ) x = fa.min()[X]; if( !_subregion_y._set ) y = fa.min()[Y]; if( !_subregion_width._set ) width = fa.width(); if( !_subregion_height._set ) height = fa.height(); if( units.get_primitive_units() == SP_FILTER_UNITS_OBJECTBOUNDINGBOX ) { Geom::OptRect const bb_opt = units.get_item_bbox(); if (!bb_opt) { std::cerr << "FilterPrimitive::filter_primitive_area: bounding box undefined and 'primitiveUnits' is 'objectBoundingBox'." << std::endl; return Geom::Rect (Geom::Point(0.,0.), Geom::Point(0.,0.)); } Geom::Rect bb = *bb_opt; // Update computed values for ex, em, %. // For %, assumes primitive unit is objectBoundingBox. // TODO: fetch somehow the object ex and em lengths; 12, 6 are just dummy values. double len_x = bb.width(); double len_y = bb.height(); _subregion_x.update(12, 6, len_x); _subregion_y.update(12, 6, len_y); _subregion_width.update(12, 6, len_x); _subregion_height.update(12, 6, len_y); // Values are in terms of fraction of bounding box. if( _subregion_x._set && (_subregion_x.unit != SVGLength::PERCENT) ) x = bb.min()[X] + bb.width() * _subregion_x.value; if( _subregion_y._set && (_subregion_y.unit != SVGLength::PERCENT) ) y = bb.min()[Y] + bb.height() * _subregion_y.value; if( _subregion_width._set && (_subregion_width.unit != SVGLength::PERCENT) ) width = bb.width() * _subregion_width.value; if( _subregion_height._set && (_subregion_height.unit != SVGLength::PERCENT) ) height = bb.height() * _subregion_height.value; // Values are in terms of percent if( _subregion_x._set && (_subregion_x.unit == SVGLength::PERCENT) ) x = bb.min()[X] + _subregion_x.computed; if( _subregion_y._set && (_subregion_y.unit == SVGLength::PERCENT) ) y = bb.min()[Y] + _subregion_y.computed; if( _subregion_width._set && (_subregion_width.unit == SVGLength::PERCENT) ) width = _subregion_width.computed; if( _subregion_height._set && (_subregion_height.unit == SVGLength::PERCENT) ) height = _subregion_height.computed; } else { // Values are in terms of user space coordinates or percent of viewport (already calculated in sp-filter-primitive.cpp). if( _subregion_x._set ) x = _subregion_x.computed; if( _subregion_y._set ) y = _subregion_y.computed; if( _subregion_width._set ) width = _subregion_width.computed; if( _subregion_height._set ) height = _subregion_height.computed; } return Geom::Rect (Geom::Point(x,y), Geom::Point(x + width, y + height)); } void FilterPrimitive::setStyle(SPStyle *style) { if( style != _style ) { if (style) sp_style_ref(style); if (_style) sp_style_unref(_style); _style = style; } } } /* namespace Filters */ } /* namespace Inkscape */ /* 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 :