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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* feOffset filter primitive renderer
*
* Authors:
* Niko Kiirala <niko@kiirala.com>
*
* Copyright (C) 2007 authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include "display/cairo-utils.h"
#include "display/nr-filter-offset.h"
#include "display/nr-filter-slot.h"
#include "display/nr-filter-units.h"
namespace Inkscape {
namespace Filters {
using Geom::X;
using Geom::Y;
FilterOffset::FilterOffset() :
dx(0), dy(0)
{}
FilterPrimitive * FilterOffset::create() {
return new FilterOffset();
}
FilterOffset::~FilterOffset()
= default;
void FilterOffset::render_cairo(FilterSlot &slot)
{
cairo_surface_t *in = slot.getcairo(_input);
cairo_surface_t *out = ink_cairo_surface_create_identical(in);
// color_interpolation_filters for out same as in. See spec (DisplacementMap).
copy_cairo_surface_ci(in, out);
cairo_t *ct = cairo_create(out);
Geom::Rect vp = filter_primitive_area( slot.get_units() );
slot.set_primitive_area(_output, vp); // Needed for tiling
Geom::Affine p2pb = slot.get_units().get_matrix_primitiveunits2pb();
double x = dx * p2pb.expansionX();
double y = dy * p2pb.expansionY();
cairo_set_source_surface(ct, in, x, y);
cairo_paint(ct);
cairo_destroy(ct);
slot.set(_output, out);
cairo_surface_destroy(out);
}
bool FilterOffset::can_handle_affine(Geom::Affine const &)
{
return true;
}
void FilterOffset::set_dx(double amount) {
dx = amount;
}
void FilterOffset::set_dy(double amount) {
dy = amount;
}
void FilterOffset::area_enlarge(Geom::IntRect &area, Geom::Affine const &trans)
{
Geom::Point offset(dx, dy);
offset *= trans;
offset[X] -= trans[4];
offset[Y] -= trans[5];
double x0, y0, x1, y1;
x0 = area.left();
y0 = area.top();
x1 = area.right();
y1 = area.bottom();
if (offset[X] > 0) {
x0 -= ceil(offset[X]);
} else {
x1 -= floor(offset[X]);
}
if (offset[Y] > 0) {
y0 -= ceil(offset[Y]);
} else {
y1 -= floor(offset[Y]);
}
area = Geom::IntRect(x0, y0, x1, y1);
}
double FilterOffset::complexity(Geom::Affine const &)
{
return 1.02;
}
} /* 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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