src/font.c

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * Copyright 2023 Mike Becker. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "ascension/ui/font.h"
#include "ascension/context.h"
#include "ascension/error.h"

static char const *asc_font_filename(enum AscFontStyle style) {
    // TODO: do not assume we are running from the program dir
    switch (style) {
        case ASC_FONT_REGULAR:
            return "fonts/OpenSans-Regular.ttf";
        case ASC_FONT_BOLD:
            return "fonts/OpenSans-Bold.ttf";
        case ASC_FONT_ITALIC:
            return "fonts/OpenSans-Italic.ttf";
        case ASC_FONT_BOLD_ITALIC:
            return "fonts/OpenSans-BoldItalic.ttf";
    }
}

AscFont const *asc_font(enum AscFontStyle style, int size) {
    for (unsigned int i = 0 ; i < asc_context.fonts_loaded ; i++) {
        AscFont *font = &asc_context.fonts[i];
        if (font->size == size && font->style == style) {
            return font;
        }
    }

    if (asc_context.fonts_loaded == ASC_MAX_FONTS) {
        asc_dprintf("WARNING: Maximum number of fonts reached, wiping cache!");
        asc_font_cache_clear();
    }

    unsigned int slot = asc_context.fonts_loaded++;
    AscFont *font = &asc_context.fonts[slot];
    font->size = size;
    font->style = style;
    font->ptr = TTF_OpenFont(asc_font_filename(style), size);
    if (font->ptr == NULL) {
        asc_context.fonts_loaded--;
        asc_error(TTF_GetError());
        return NULL;
    }
    asc_dprintf("Loaded font size %u, style %u in slot %u", size, style, slot);
    return font;
}

void asc_font_cache_clear(void) {
    asc_dprintf("Fonts in cache that are being unloaded: %u", asc_context.fonts_loaded);
    while (asc_context.fonts_loaded > 0) {
        unsigned int i = --asc_context.fonts_loaded;
        AscFont *font = &asc_context.fonts[i];
        TTF_CloseFont(font->ptr);
        font->ptr = NULL;
    }
}

AscFont const *asc_font_cache_validate(AscFont const *font) {
    if (font->ptr) {
        return font;
    } else {
        asc_dprintf("Cache miss for font size %u, style %u", font->size, font->style);
        return asc_font(font->style, font->size);
    }
}