cbirds/font.c at master · clainstone/cbirds · GitHub

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#include "font.h"

#include <ctype.h>
#include <string.h>

typedef struct {
    char character;
    const char *rows;
} glyph_t;

/* clang-format off */
static const glyph_t GLYPHS[] = {
    {' ', "....." "....." "....." "....." "....." "....." "....."},
    {'A', ".###." "#...#" "#...#" "#####" "#...#" "#...#" "#...#"},
    {'B', "####." "#...#" "#...#" "####." "#...#" "#...#" "####."},
    {'C', ".###." "#...#" "#...." "#...." "#...." "#...#" ".###."},
    {'D', "####." "#...#" "#...#" "#...#" "#...#" "#...#" "####."},
    {'E', "#####" "#...." "#...." "####." "#...." "#...." "#####"},
    {'F', "#####" "#...." "#...." "####." "#...." "#...." "#...."},
    {'G', ".###." "#...#" "#...." "#..##" "#...#" "#...#" ".###."},
    {'H', "#...#" "#...#" "#...#" "#####" "#...#" "#...#" "#...#"},
    {'I', "#####" "..#.." "..#.." "..#.." "..#.." "..#.." "#####"},
    {'J', "..###" "...#." "...#." "...#." "...#." "#..#." ".##.."},
    {'K', "#...#" "#..#." "#.#.." "##..." "#.#.." "#..#." "#...#"},
    {'L', "#...." "#...." "#...." "#...." "#...." "#...." "#####"},
    {'M', "#...#" "##.##" "#.#.#" "#...#" "#...#" "#...#" "#...#"},
    {'N', "#...#" "##..#" "#.#.#" "#..##" "#...#" "#...#" "#...#"},
    {'O', ".###." "#...#" "#...#" "#...#" "#...#" "#...#" ".###."},
    {'P', "####." "#...#" "#...#" "####." "#...." "#...." "#...."},
    {'Q', ".###." "#...#" "#...#" "#...#" "#.#.#" "#..#." ".##.#"},
    {'R', "####." "#...#" "#...#" "####." "#.#.." "#..#." "#...#"},
    {'S', ".####" "#...." "#...." ".###." "....#" "....#" "####."},
    {'T', "#####" "..#.." "..#.." "..#.." "..#.." "..#.." "..#.."},
    {'U', "#...#" "#...#" "#...#" "#...#" "#...#" "#...#" ".###."},
    {'V', "#...#" "#...#" "#...#" "#...#" "#...#" ".#.#." "..#.."},
    {'W', "#...#" "#...#" "#...#" "#.#.#" "#.#.#" "##.##" "#...#"},
    {'X', "#...#" "#...#" ".#.#." "..#.." ".#.#." "#...#" "#...#"},
    {'Y', "#...#" "#...#" ".#.#." "..#.." "..#.." "..#.." "..#.."},
    {'Z', "#####" "....#" "...#." "..#.." ".#..." "#...." "#####"},
    {'0', ".###." "#...#" "#..##" "#.#.#" "##..#" "#...#" ".###."},
    {'1', "..#.." ".##.." "..#.." "..#.." "..#.." "..#.." ".###."},
    {'2', ".###." "#...#" "....#" "...#." "..#.." ".#..." "#####"},
    {'3', "#####" "...#." "..#.." "...#." "....#" "#...#" ".###."},
    {'4', "...#." "..##." ".#.#." "#..#." "#####" "...#." "...#."},
    {'5', "#####" "#...." "####." "....#" "....#" "#...#" ".###."},
    {'6', "..##." ".#..." "#...." "####." "#...#" "#...#" ".###."},
    {'7', "#####" "....#" "...#." "..#.." ".#..." ".#..." ".#..."},
    {'8', ".###." "#...#" "#...#" ".###." "#...#" "#...#" ".###."},
    {'9', ".###." "#...#" "#...#" ".####" "....#" "...#." ".##.."},
    {'.', "....." "....." "....." "....." "....." ".##.." ".##.."},
    {',', "....." "....." "....." "....." ".##.." ".##.." "..#.."},
    {'!', "..#.." "..#.." "..#.." "..#.." "..#.." "....." "..#.."},
    {'?', ".###." "#...#" "....#" "...#." "..#.." "....." "..#.."},
    {'\'', "..#.." "..#.." "....." "....." "....." "....." "....."},
    {'-', "....." "....." "....." "#####" "....." "....." "....."},
    {'+', "....." "..#.." "..#.." "#####" "..#.." "..#.." "....."},
    {'=', "....." "....." "#####" "....." "#####" "....." "....."},
    {':', "....." "..#.." "..#.." "....." "..#.." "..#.." "....."},
    {'/', "....#" "....#" "...#." "..#.." ".#..." "#...." "#...."},
    {'(', "...#." "..#.." ".#..." ".#..." ".#..." "..#.." "...#."},
    {')', ".#..." "..#.." "...#." "...#." "...#." "..#.." ".#..."},
    {'*', "....." "#...#" ".#.#." "#####" ".#.#." "#...#" "....."},
    {'<', "...#." "..#.." ".#..." "#...." ".#..." "..#.." "...#."},
    {'>', ".#..." "..#.." "...#." "....#" "...#." "..#.." ".#..."},
    {'#', ".#.#." ".#.#." "#####" ".#.#." "#####" ".#.#." ".#.#."},
    {'@', ".###." "#...#" "#.###" "#.#.#" "#.###" "#...." ".###."},
    {'%', "#...#" "#..#." "..#.." ".#..." "..#.." ".#..#" "#...#"},
    {'&', ".##.." "#..#." "#.#.." ".#..." "#.#.#" "#..#." ".##.#"},
    {'_', "....." "....." "....." "....." "....." "....." "#####"},
};
/* clang-format on */
enum { GLYPH_COUNT = sizeof(GLYPHS) / sizeof(*GLYPHS) };

const char *font_glyph(char character) {
    char wanted = (char)toupper((unsigned char)character);
    for (int i = 0; i < GLYPH_COUNT; i++)
        if (GLYPHS[i].character == wanted) return GLYPHS[i].rows;
    return NULL;
}

int font_text_cells(const char *text) {
    int cells = 0;
    if (text == NULL) return 0;
    for (const char *c = text; *c != '\0'; c++) {
        const char *rows = font_glyph(*c);
        if (rows == NULL) continue;
        for (int i = 0; i < FONT_WIDTH * FONT_HEIGHT; i++)
            if (rows[i] == '#') cells++;
    }
    return cells;
}

int font_text_width(const char *text) {
    int glyphs = 0;
    if (text == NULL) return 0;
    for (const char *c = text; *c != '\0'; c++)
        if (font_glyph(*c) != NULL) glyphs++;
    return glyphs > 0 ? glyphs * FONT_ADVANCE - 1 : 0;
}