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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* feMerge filter effect renderer
*
* Authors:
* Niko Kiirala <niko@kiirala.com>
*
* Copyright (C) 2007 authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include <vector>
#include "display/cairo-utils.h"
#include "display/nr-filter-merge.h"
#include "display/nr-filter-slot.h"
#include "display/nr-filter-utils.h"
namespace Inkscape {
namespace Filters {
FilterMerge::FilterMerge()
: _input_image({NR_FILTER_SLOT_NOT_SET}) {}
void FilterMerge::render_cairo(FilterSlot &slot) const
{
if (_input_image.empty()) return;
Geom::Rect vp = filter_primitive_area(slot.get_units());
slot.set_primitive_area(_output, vp); // Needed for tiling
// output is RGBA if at least one input is RGBA
bool rgba32 = false;
cairo_surface_t *out = nullptr;
for (auto &i : _input_image) {
cairo_surface_t *in = slot.getcairo(i);
if (cairo_surface_get_content(in) == CAIRO_CONTENT_COLOR_ALPHA) {
out = ink_cairo_surface_create_identical(in);
set_cairo_surface_ci(out, color_interpolation);
rgba32 = true;
break;
}
}
if (!rgba32) {
out = ink_cairo_surface_create_identical(slot.getcairo(_input_image[0]));
}
cairo_t *out_ct = cairo_create(out);
for (auto &i : _input_image) {
cairo_surface_t *in = slot.getcairo(i);
set_cairo_surface_ci(in, color_interpolation);
cairo_set_source_surface(out_ct, in, 0, 0);
cairo_paint(out_ct);
}
cairo_destroy(out_ct);
slot.set(_output, out);
cairo_surface_destroy(out);
}
bool FilterMerge::can_handle_affine(Geom::Affine const &) const
{
// Merge is a per-pixel primitive and is immutable under transformations
return true;
}
double FilterMerge::complexity(Geom::Affine const &) const
{
return 1.02;
}
bool FilterMerge::uses_background() const
{
for (int input : _input_image) {
if (input == NR_FILTER_BACKGROUNDIMAGE || input == NR_FILTER_BACKGROUNDALPHA) {
return true;
}
}
return false;
}
void FilterMerge::set_input(int slot)
{
_input_image[0] = slot;
}
void FilterMerge::set_input(int input, int slot)
{
if (input < 0) return;
if (_input_image.size() > input) {
_input_image[input] = slot;
} else {
for (int i = _input_image.size(); i < input ; i++) {
_input_image.emplace_back(NR_FILTER_SLOT_NOT_SET);
}
_input_image.push_back(slot);
}
}
} // 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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