/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://www.hdfgroup.org/licenses.               *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include "hdf5.h"
#include "H5IMpublic.h"

/*-------------------------------------------------------------------------
 * Program: h52gifgentst
 *
 * Purpose: generate files for h52gif testing
 *
 *-------------------------------------------------------------------------
 */

#define FILENAME    "h52giftst.h5"
#define WIDTH       400
#define HEIGHT      200
#define PAL_ENTRIES 256
#define IMAGE1_NAME "image"
#define PAL_NAME    "palette"

/*-------------------------------------------------------------------------
 * Function: main
 *
 * Purpose: main program
 *
 *-------------------------------------------------------------------------
 */

int
main(void)
{
    hid_t          fid;
    int            i, j, n, space;
    unsigned char *buf;
    unsigned char  pal[PAL_ENTRIES * 3];           /* palette array */
    hsize_t        pal_dims[2] = {PAL_ENTRIES, 3}; /* palette dimensions */
    hsize_t        width       = WIDTH;
    hsize_t        height      = HEIGHT;

    /* Allocate buffer */
    if (NULL == (buf = (unsigned char *)malloc(WIDTH * HEIGHT)))
        return EXIT_FAILURE;

    /* create a file  */
    if ((fid = H5Fcreate(FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT)) < 0)
        return EXIT_FAILURE;

    /* create an image */
    space = WIDTH * HEIGHT / PAL_ENTRIES;
    for (i = 0, j = 0, n = 0; i < WIDTH * HEIGHT; i++, j++) {
        buf[i] = (unsigned char)n;
        if (j > space) {
            n++;
            j = 0;
        }
    }

    /* make the image */
    if (H5IMmake_image_8bit(fid, IMAGE1_NAME, width, height, buf) < 0)
        return EXIT_FAILURE;

    /*-------------------------------------------------------------------------
     * define a palette, blue to red tones
     *-------------------------------------------------------------------------
     */
    for (i = 0, n = 0; i < PAL_ENTRIES * 3; i += 3, n++) {
        pal[i]     = (unsigned char)n;         /* red */
        pal[i + 1] = (unsigned char)0;         /* green */
        pal[i + 2] = (unsigned char)(255 - n); /* blue */
    }

    /* make a palette */
    if (H5IMmake_palette(fid, PAL_NAME, pal_dims, pal) < 0)
        return EXIT_FAILURE;

    /* attach the palette to the image */
    if (H5IMlink_palette(fid, IMAGE1_NAME, PAL_NAME) < 0)
        return EXIT_FAILURE;

    if (H5Fclose(fid) < 0)
        return EXIT_FAILURE;

    free(buf);

    return EXIT_SUCCESS;
}