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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* feTile filter primitive renderer
*
* Authors:
* Felipe Corrêa da Silva Sanches <juca@members.fsf.org>
*
* Copyright (C) 2007 authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include <glib.h>
#include "display/cairo-utils.h"
#include "display/nr-filter-tile.h"
#include "display/nr-filter-slot.h"
#include "display/nr-filter-units.h"
namespace Inkscape {
namespace Filters {
FilterTile::FilterTile() = default;
FilterTile::~FilterTile() = default;
void FilterTile::render_cairo(FilterSlot &slot) const
{
// This input source contains only the "rendering" tile.
cairo_surface_t *in = slot.getcairo(_input);
// For debugging
// static int i = 0;
// ++i;
// std::stringstream filename;
// filename << "dump." << i << ".png";
// cairo_surface_write_to_png( in, filename.str().c_str() );
// This is the feTile source area as determined by the input primitive area (see SVG spec).
Geom::Rect tile_area = slot.get_primitive_area(_input);
if (tile_area.width() == 0.0 || tile_area.height() == 0.0) {
slot.set(_output, in);
std::cerr << "FileTile::render_cairo: tile has zero width or height" << std::endl;
} else {
cairo_surface_t *out = ink_cairo_surface_create_identical(in);
// color_interpolation_filters for out same as in.
copy_cairo_surface_ci(in, out);
cairo_t *ct = cairo_create(out);
// The rectangle of the "rendering" tile.
Geom::Rect sa = slot.get_slot_area();
Geom::Affine trans = slot.get_units().get_matrix_user2pb();
// Create feTile tile ----------------
// Get tile area in pixbuf units (tile transformed).
Geom::Rect tt = tile_area * trans;
// Shift between "rendering" tile and feTile tile
Geom::Point shift = sa.min() - tt.min();
// Create feTile tile surface
cairo_surface_t *tile = cairo_surface_create_similar(in, cairo_surface_get_content(in),
tt.width(), tt.height());
cairo_t *ct_tile = cairo_create(tile);
cairo_set_source_surface(ct_tile, in, shift[Geom::X], shift[Geom::Y]);
cairo_paint(ct_tile);
// Paint tiles ------------------
// For debugging
// std::stringstream filename;
// filename << "tile." << i << ".png";
// cairo_surface_write_to_png( tile, filename.str().c_str() );
// Determine number of feTile rows and columns
Geom::Rect pr = filter_primitive_area(slot.get_units());
int tile_cols = std::ceil(pr.width() / tile_area.width());
int tile_rows = std::ceil(pr.height() / tile_area.height());
// Do tiling (TO DO: restrict to slot area.)
for (int col = 0; col < tile_cols; ++col) {
for (int row = 0; row < tile_rows; ++row) {
Geom::Point offset(col * tile_area.width(), row * tile_area.height());
offset *= trans;
offset[Geom::X] -= trans[4];
offset[Geom::Y] -= trans[5];
cairo_set_source_surface(ct, tile, offset[Geom::X], offset[Geom::Y]);
cairo_paint(ct);
}
}
slot.set(_output, out);
// Clean up
cairo_destroy(ct);
cairo_surface_destroy(out);
cairo_destroy(ct_tile);
cairo_surface_destroy(tile);
}
}
void FilterTile::area_enlarge(Geom::IntRect &area, Geom::Affine const &trans) const
{
// Set to very large rectangle so we get tile source. It will be clipped later.
// Note, setting to infinite using Geom::IntRect::infinite() causes overflow/underflow problems.
Geom::IntCoord max = std::numeric_limits<Geom::IntCoord>::max() / 4;
area = Geom::IntRect(-max, -max, max, max);
}
double FilterTile::complexity(Geom::Affine const &) const
{
return 1.0;
}
} // 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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