smgui/mods/ui_ssfn.h

/*
 * ui_ssfn.h
 * 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 Scalable Screen font driver for SMGUI
 */

#ifndef UI_SSFN_H
#define UI_SSFN_H 1
#ifndef UI_FONT
#define UI_FONT 1
#else
#error "An UI font implementation has already been included"
#endif

#define SSFN_IMPLEMENTATION
#include <stdint.h>
#include <ssfn.h>
#ifndef UI_H
#include <ui.h>
#undef UI_H
#endif
#define UI_SETFONTHOOK ui_ssfn_bbox,ui_ssfn_draw

#ifdef  __cplusplus
extern "C" {
#endif

/**
 * Measure string and return width, height, left margin, and baseline (top)
 */
int ui_ssfn_bbox(void *fnt, char *str, char *end, int *w, int *h, int *l, int *t)
{
    char c;
    if(str && end) { c = *end; *end = 0; }
    ssfn_bbox((ssfn_t*)fnt, str, w, h, l, t);
    if(str && end) *end = c;
    return 0;
}

/**
 * Draw an UTF-8 string to the given pixel buffer
 */
int ui_ssfn_draw(void *fnt, char *str, char *end, uint8_t *dst, uint32_t color, int x, int y, int l, int t, int p,
    int cx0, int cy0, int cx1, int cy1)
{
    ssfn_t *ssfn = (ssfn_t*)fnt;
    ssfn_buf_t buf = { 0 };
    int ret;

    if(!dst || !str || cx1 < 1 || cy1 < 1 || p < 4) return -1;
    if(x >= cx1 || y >= cy1) return 0;

    buf.ptr = (uint8_t*)dst + cy0 * p + (cx0 << 2);
    buf.w = cx1 - cx0;
    buf.h = cy1 - cy0;
    buf.p = p;
    buf.x = l + (x - cx0);
    buf.y = t + (y - cy0);
    buf.fg = color;
    while((!end || str < end) && (ret = ssfn_render(ssfn, &buf, str)) > 0)
        str += ret;
    return 0;
}

#ifdef  __cplusplus
}
#endif

#endif /* UI_SSFN_H */