// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * feFlood filter primitive renderer
 *
 * Authors:
 *   Felipe Corrêa da Silva Sanches <juca@members.fsf.org>
 *   Tavmjong Bah <tavmjong@free.fr> (use primitive filter region)
 *
 * Copyright (C) 2007, 2011 authors
 *
 * Released under GNU GPL v2+, read the file 'COPYING' for more information.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"  // only include where actually required!
#endif

#include "display/cairo-utils.h"
#include "display/nr-filter-flood.h"
#include "display/nr-filter-slot.h"
#include "svg/svg-icc-color.h"
#include "svg/svg-color.h"
#include "color.h"

namespace Inkscape {
namespace Filters {

FilterFlood::FilterFlood()
= default;

FilterPrimitive * FilterFlood::create() {
    return new FilterFlood();
}

FilterFlood::~FilterFlood()
= default;

void FilterFlood::render_cairo(FilterSlot &slot)
{
    cairo_surface_t *input = slot.getcairo(_input);

    double r = SP_RGBA32_R_F(color);
    double g = SP_RGBA32_G_F(color);
    double b = SP_RGBA32_B_F(color);
    double a = opacity;

    if (icc) {
        guchar ru, gu, bu;
        icc_color_to_sRGB(icc, &ru, &gu, &bu);
        r = SP_COLOR_U_TO_F(ru);
        g = SP_COLOR_U_TO_F(gu);
        b = SP_COLOR_U_TO_F(bu);
    }

    cairo_surface_t *out = ink_cairo_surface_create_same_size(input, CAIRO_CONTENT_COLOR_ALPHA);

    SPColorInterpolation ci_fp  = SP_CSS_COLOR_INTERPOLATION_AUTO;
    if( _style ) {
        ci_fp = (SPColorInterpolation)_style->color_interpolation_filters.computed;

        // Flood color is always defined in terms of sRGB, preconvert to linearRGB
        // if color_interpolation_filters set to linearRGB (for efficiency assuming
        // next filter primitive has same value of cif).
        if( ci_fp == SP_CSS_COLOR_INTERPOLATION_LINEARRGB ) {
            r = srgb_to_linear( r );
            g = srgb_to_linear( g );
            b = srgb_to_linear( b );
        }
    }
    set_cairo_surface_ci(out, ci_fp );

    // Get filter primitive area in user units
    Geom::Rect fp = filter_primitive_area( slot.get_units() );

    // Convert to Cairo units
    Geom::Rect fp_cairo = fp * slot.get_units().get_matrix_user2pb();

    // Get area in slot (tile to fill)
    Geom::Rect sa = slot.get_slot_area();

    // Get overlap
    Geom::OptRect optoverlap = intersect( fp_cairo, sa );
    if( optoverlap ) {

        Geom::Rect overlap = *optoverlap;

        double dx = fp_cairo.min()[Geom::X] - sa.min()[Geom::X];
        double dy = fp_cairo.min()[Geom::Y] - sa.min()[Geom::Y];
        if( dx < 0.0 ) dx = 0.0;
        if( dy < 0.0 ) dy = 0.0;

        cairo_t *ct = cairo_create(out);
        cairo_set_source_rgba(ct, r, g, b, a);
        cairo_set_operator(ct, CAIRO_OPERATOR_SOURCE);
        cairo_rectangle(ct, dx, dy, overlap.width(), overlap.height() );
        cairo_fill(ct);
        cairo_destroy(ct);
    }

    slot.set(_output, out);
    cairo_surface_destroy(out);
}

bool FilterFlood::can_handle_affine(Geom::Affine const &)
{
    // flood is a per-pixel primitive and is immutable under transformations
    return true;
}

void FilterFlood::set_color(guint32 c) {
    color = c;
}

void FilterFlood::set_opacity(double o) {
    opacity = o;
}

void FilterFlood::set_icc(SVGICCColor *icc_color) {
    icc = icc_color;
}
double FilterFlood::complexity(Geom::Affine const &)
{
    // flood is actually less expensive than normal rendering,
    // but when flood is processed, the object has already been rendered
    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 :