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#define STB_TRUETYPE_IMPLEMENTATION
#include "stb_truetype.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static const int iso8859_2_to_utf32[256] = {
0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
0x0008, 0x0009, 0x000A, 0x000B, 0x000C, 0x000D, 0x000E, 0x000F,
0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,
0x0018, 0x0019, 0x001A, 0x001B, 0x001C, 0x001D, 0x001E, 0x001F,
0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
0x0028, 0x0029, 0x002A, 0x002B, 0x002C, 0x002D, 0x002E, 0x002F,
0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
0x0038, 0x0039, 0x003A, 0x003B, 0x003C, 0x003D, 0x003E, 0x003F,
0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
0x0048, 0x0049, 0x004A, 0x004B, 0x004C, 0x004D, 0x004E, 0x004F,
0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
0x0058, 0x0059, 0x005A, 0x005B, 0x005C, 0x005D, 0x005E, 0x005F,
0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
0x0068, 0x0069, 0x006A, 0x006B, 0x006C, 0x006D, 0x006E, 0x006F,
0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
0x0078, 0x0079, 0x007A, 0x007B, 0x007C, 0x007D, 0x007E, 0x007F,
0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087,
0x0088, 0x0089, 0x008A, 0x008B, 0x008C, 0x008D, 0x008E, 0x008F,
0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097,
0x0098, 0x0099, 0x009A, 0x009B, 0x009C, 0x009D, 0x009E, 0x009F,
0x00A0, 0x0104, 0x02D8, 0x0141, 0x00A4, 0x013D, 0x015A, 0x00A7,
0x00A8, 0x0160, 0x015E, 0x0164, 0x0179, 0x00AD, 0x017D, 0x017B,
0x00B0, 0x0105, 0x02DB, 0x0142, 0x00B4, 0x013E, 0x015B, 0x02C7,
0x00B8, 0x0161, 0x015F, 0x0165, 0x017A, 0x02DD, 0x017E, 0x017C,
0x0154, 0x00C1, 0x00C2, 0x0102, 0x00C4, 0x0139, 0x0106, 0x00C7,
0x010C, 0x00C9, 0x0118, 0x00CB, 0x011A, 0x00CD, 0x00CE, 0x010E,
0x0110, 0x0143, 0x0147, 0x00D3, 0x00D4, 0x0150, 0x00D6, 0x00D7,
0x0158, 0x016E, 0x00DA, 0x0170, 0x00DC, 0x00DD, 0x0162, 0x00DF,
0x0155, 0x00E1, 0x00E2, 0x0103, 0x00E4, 0x013A, 0x0107, 0x00E7,
0x010D, 0x00E9, 0x0119, 0x00EB, 0x011B, 0x00ED, 0x00EE, 0x010F,
0x0111, 0x0144, 0x0148, 0x00F3, 0x00F4, 0x0151, 0x00F6, 0x00F7,
0x0159, 0x016F, 0x00FA, 0x0171, 0x00FC, 0x00FD, 0x0163, 0x02D9,
};
#define CHAR_W 8
#define CHAR_H 12
#define EM_HEIGHT 8
#define BASELINE 14
typedef struct {
unsigned char data[12]; // each element is a row, bits are columns, LSB = leftmost
unsigned char width;
} AtlasItem;
void atlas_item_print(const AtlasItem *item) {
for (int y = 0; y < CHAR_H; y++) {
for (int x = 0; x < CHAR_W; x++) {
putchar((item->data[y] & (1 << x)) ? '@' : '.');
}
putchar('\n');
}
putchar('\n');
}
AtlasItem atlas_item_from_codepoint(stbtt_fontinfo *font, int codepoint) {
AtlasItem item = {0};
int w, h, xoff, yoff;
unsigned char *bitmap = stbtt_GetCodepointBitmap(
font,
0,
stbtt_ScaleForMappingEmToPixels(font, EM_HEIGHT),
codepoint,
&w,
&h,
&xoff,
&yoff
);
int out_w = w > CHAR_W ? CHAR_W : w;
int out_h = h > CHAR_H ? CHAR_H : h;
if (w > CHAR_W) printf("invalid width %d for glyph %lc\n", w, codepoint);
if (h > CHAR_H) printf("invalid height %d for glyph %lc\n", h, codepoint);
int cell_y = BASELINE + yoff; // yoff is negative for above-baseline glyphs
for (int y = 0; y < out_h; y++) {
int dest_y = cell_y + y;
if (dest_y < 0 || dest_y >= CHAR_H) continue;
for (int x = 0; x < out_w; x++) {
if (bitmap[y * w + x] > 0x7F)
item.data[dest_y] |= (1 << x);
}
}
stbtt_FreeBitmap(bitmap, NULL);
item.width = (unsigned char)out_w;
return item;
}
char ttf_buffer[1 << 25];
int main(int argc, char **argv)
{
const char *font_name = argc > 1 ? argv[1] : "Minecraftia-Regular.ttf";
FILE *f = fopen(font_name, "rb");
if (!f) {
perror(font_name);
return 1;
}
fread(ttf_buffer, 1, sizeof(ttf_buffer), f);
fclose(f);
stbtt_fontinfo font;
stbtt_InitFont(
&font,
(unsigned char *)ttf_buffer,
stbtt_GetFontOffsetForIndex((unsigned char *)ttf_buffer, 0)
);
AtlasItem result[256];
for (int i = 0; i < 256; i++) {
memset(&result[i].data, 0xFF, sizeof(result[i].data));
result[i].width = 8;
}
memset(&result[' '].data, 0x00, sizeof(result[' '].data));
result[' '].width = 2;
// printable ASCII
for (int i = 33; i < 127; i++) {
result[i] = atlas_item_from_codepoint(&font, i);
}
unsigned char polish_iso8859_2[] = {
// Ą, Ć, Ę, Ł, Ń, Ó, Ś, Ź, Ż, ą, ć, ę, ł, ń, ó, ś, ź, ż
161, 198, 202, 163, 209, 211, 166, 172, 175, 177, 230, 234, 179, 241, 243, 182, 188, 191
};
// ISO-8859-2 slop
for (int i = 0; i < sizeof(polish_iso8859_2); i++) {
int actual_index = polish_iso8859_2[i];
result[actual_index] = atlas_item_from_codepoint(&font, iso8859_2_to_utf32[actual_index]);
}
FILE *out = fopen("../font_atlas.c", "w");
fprintf(out, "#include <stdint.h>\n\n");
fprintf(out, "#define FONT_CHAR_W 8\n");
fprintf(out, "#define FONT_CHAR_H 12\n\n");
fprintf(out, "typedef struct {\n");
fprintf(out, " uint8_t data[12];\n");
fprintf(out, " uint8_t width;\n");
fprintf(out, "} FontGlyph;\n\n");
fprintf(out, "static const FontGlyph font_glyphs[256] = {\n");
for (int i = 0; i < 256; i++) {
AtlasItem *it = &result[i];
char comment[16] = "";
if (i >= 33 && i < 127)
snprintf(comment, sizeof(comment), " /* '%c' */", (char)i);
fprintf(out, " [0x%02X] =%s { {", i, comment);
for (int r = 0; r < CHAR_H; r++)
fprintf(out, "0x%02X%s", it->data[r], r < CHAR_H - 1 ? "," : "");
fprintf(out, "}, %d },\n", it->width);
}
fprintf(out, "};\n\n");
fclose(out);
return 0;
}
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