smgui/examples/ssfn.c

/*
 * src/ssfn.c
 * https://gitlab.com/bztsrc/smgui
 *
 * Copyright (C) 2024 bzt (bztsrc@gitlab), MIT license
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL ANY
 * DEVELOPER OR DISTRIBUTOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
 * IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * @brief State-Mode GUI Scalable Screen Font demo program
 */

#include <stdio.h>
#include <stdlib.h>

#include <ui_ssfn.h>
#define UI_IMPLEMENTATION
#include <ui.h>

int main(int argc, char **argv)
{
    /* strings are gathered into an array so that you can change the language on-the-fly */
    enum { WINDOW_TITLE, HELLO_WORLD };
    char *english[] = { "Window title", "Hello World!" };

    ui_t ctx;               /* the main context */
    ui_form_t form[2] = {   /* your layout */
        { .type = UI_LABEL, .align = UI_CENTER, .x = UI_PERCENT(50), .y = 100, .label = HELLO_WORLD },
        { .type = UI_END }
    };

    /* load font */
    ssfn_t fnt = { 0 };
    FILE *f;
    uint8_t *fntbuf;
    int fntsize = 0;
    if(argc < 2) { fprintf(stderr, "ssfn <font.sfn>\n"); return 1; }
    if((f = fopen(argv[1], "rb"))) {
        fseek(f, 0, SEEK_END); fntsize = (int)ftell(f); fseek(f, 0, SEEK_SET);
        if(!(fntbuf = malloc(fntsize))) { fclose(f); fprintf(stderr, "unable to allocate memory\n"); return 1; }
        fread(fntbuf, 1, fntsize, f); fclose(f);
    } else { fprintf(stderr, "unable to load font\n"); return 1; }
    /* set up SSFN context */
    ssfn_load(&fnt, fntbuf);
    ssfn_select(&fnt, SSFN_FAMILY_ANY, NULL, SSFN_STYLE_REGULAR, 16);

    /* initialize the UI context, pass it the string array, the window size and icon */
    ui_init(&ctx, 2, english, 640, 480, NULL);

    /* set SSFN font context in SMGUI */
    ui_font(&ctx, &fnt);

    /* wait until user closes the window */
    while(ui_event(&ctx, form)) { }

    /* destroy window, free resources */
    ui_free(&ctx);
    ssfn_free(&fnt);
    free(fntbuf);

    return 0;
}