// SPDX-License-Identifier: GPL-2.1-or-later
/*
 * Copyright (C) 2009-2012 Cyril Hrubis <metan@ucw.cz>
 */

 /*

   Convolution filter example.

  */

#include <stdio.h>
#include <string.h>
#include <errno.h>

#include <gfxprim.h>

struct callback_priv {
        char *op;
        char *name;
};

static int progress_callback(gp_progress_cb *self)
{
        struct callback_priv *priv = self->priv;

        printf("\r%s '%s' %3.1f%%", priv->op, priv->name, self->percentage);
        fflush(stdout);

        /*
         * It's important to return zero as non-zero return value
         * aborts the operation.
         */
        return 0;
}

int main(int argc, char *argv[])
{
        gp_pixmap *img;
        struct callback_priv priv;
        gp_progress_cb callback = {.callback = progress_callback,
                                        .priv = &priv};

        if (argc != 2) {
                fprintf(stderr, "Takes an image as an parameter\n");
                return 1;
        }

        priv.op   = "Loading";
        priv.name = argv[1];

        img = gp_load_image(argv[1], &callback);

        if (img == NULL) {
                fprintf(stderr, "Failed to load image '%s': %s\n", argv[1],
                        strerror(errno));
                return 1;
        }

        printf("\n");


        gp_filter_kernel_2d box = {
                .w = 5,
                .h = 5,
                .div = 11.8,
                .kernel = (float[]) {
                        0.0, 0.1, 1.0, 0.1, 0.0,
                        0.1, 0.5, 1.0, 0.5, 0.1,
                        1.0, 1.0, 1.0, 1.0, 1.0,
                        0.1, 0.5, 1.0, 0.5, 0.1,
                        0.0, 0.1, 1.0, 0.1, 0.0,
                }
        };

        priv.op = "Linear Convolution";

        /*
         * Blur in-place, inner rectangle of the image.
         */
        gp_filter_convolution_ex(img, img->w/4, img->h/4, img->w/2, img->h/2,
                                 img, img->w/4, img->h/4, &box, &callback);

        printf("\n");

        priv.op   = "Saving";
        priv.name = "out.png";

        if (gp_save_png(img, "out.png", &callback)) {
                fprintf(stderr, "Failed to save image: %s", strerror(errno));
                return 1;
        }

        printf("\n");

        return 0;
}