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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* SVG filters rendering
*
* Author:
* Niko Kiirala <niko@kiirala.com>
* Tavmjong Bah <tavmjong@free.fr> (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 :
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