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#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <ft2build.h>
#include FT_FREETYPE_H
#define MAX(a, b) ((a) > (b) ? (a) : (b))
static inline unsigned char bitreverse(unsigned char b) {
b = (b & 0b11110000) >> 4 | (b & 0b00001111) << 4;
b = (b & 0b11001100) >> 2 | (b & 0b00110011) << 2;
b = (b & 0b10101010) >> 1 | (b & 0b01010101) << 1;
return b;
}
int main(int argc, char *argv[])
{
#define TRY(expr, ...) if (!(expr)) \
{ fprintf(stderr, "%s: ", argv[0]); fprintf(stderr, __VA_ARGS__); return EXIT_FAILURE; }
TRY(argc == 2, "usage: %s infile.ttf > outfile.cuddlefont\n", argv[0]);
FT_Library lib;
TRY(FT_Init_FreeType(&lib) == 0, "failed to initialize freetype\n");
FT_Face face;
TRY(FT_New_Face(lib, argv[1], 0, &face) == 0, "failed to load %s\n", argv[1]);
// TRY(FT_Set_Pixel_Sizes(face, 0, 16) == 0, "failed to select pixel size of 8x16\n");
for (int i = 0;; i++) {
TRY(i != face->num_fixed_sizes, "no 8x16 size available\n");
if (face->available_sizes[i].height == 16 &&
face->available_sizes[i].width == 8) {
TRY(FT_Select_Size(face, i) == 0, "failed to select font size");
break;
}
}
assert(bitreverse(0b10000000) == 0b00000001);
for (int i = 0; i < 256; i++) {
TRY(FT_Load_Glyph(face, FT_Get_Char_Index(face, i), FT_LOAD_DEFAULT) == 0,
"failed to load glyph %d\n", i);
TRY(FT_Render_Glyph(face->glyph, FT_RENDER_MODE_MONO) == 0,
"failed to render glyph %d\n", i);
for (unsigned int y = 0; y < 16; y++)
putchar(bitreverse(face->glyph->bitmap.buffer[y * face->glyph->bitmap.pitch]));
}
}
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