text: /*
  gcc main.c -I/usr/include/freetype2 -lfreetype && ./a.out 12 ../../testdata/luxisr.ttf with_hinting
  */
  
  #include <stdio.h>
  #include <ft2build.h>
  #include FT_FREETYPE_H
  
  void usage(char** argv) {
  	fprintf(stderr, "usage: %s font_size font_file [with_hinting|sans_hinting]\n", argv[0]);
  }
  
  int main(int argc, char** argv) {
  	FT_Error error;
  	FT_Library library;
  	FT_Face face;
  	FT_Glyph_Metrics* m;
  	FT_Outline* o;
  	FT_Int major, minor, patch;
  	int i, j, font_size, no_hinting;
  
  	if (argc != 4) {
  		usage(argv);
  		return 1;
  	}
  	font_size = atoi(argv[1]);
  	if (font_size <= 0) {
  		fprintf(stderr, "invalid font_size\n");
  		usage(argv);
  		return 1;
  	}
  	if (!strcmp(argv[3], "with_hinting")) {
  		no_hinting = 0;
  	} else if (!strcmp(argv[3], "sans_hinting")) {
  		no_hinting = 1;
  	} else {
  		fprintf(stderr, "neither \"with_hinting\" nor \"sans_hinting\"\n");
  		usage(argv);
  		return 1;
  	};
  	error = FT_Init_FreeType(&library);
  	if (error) {
  		fprintf(stderr, "FT_Init_FreeType: error #%d\n", error);
  		return 1;
  	}
  	FT_Library_Version(library, &major, &minor, &patch);
  	printf("freetype version %d.%d.%d\n", major, minor, patch);
  	error = FT_New_Face(library, argv[2], 0, &face);
  	if (error) {
  		fprintf(stderr, "FT_New_Face: error #%d\n", error);
  		return 1;
  	}
  	error = FT_Set_Char_Size(face, 0, font_size*64, 0, 0);
  	if (error) {
  		fprintf(stderr, "FT_Set_Char_Size: error #%d\n", error);
  		return 1;
  	}
  	for (i = 0; i < face->num_glyphs; i++) {
  		error = FT_Load_Glyph(face, i, no_hinting ? FT_LOAD_NO_HINTING : FT_LOAD_DEFAULT);
  		if (error) {
  			fprintf(stderr, "FT_Load_Glyph: glyph %d: error #%d\n", i, error);
  			return 1;
  		}
  		if (face->glyph->format != FT_GLYPH_FORMAT_OUTLINE) {
  			fprintf(stderr, "glyph format for glyph %d is not FT_GLYPH_FORMAT_OUTLINE\n", i);
  			return 1;
  		}
  		m = &face->glyph->metrics;
  		/* Print what Go calls the AdvanceWidth, and then: XMin, YMin, XMax, YMax. */
  		printf("%ld %ld %ld %ld %ld;",
  				m->horiAdvance,
  				m->horiBearingX,
  				m->horiBearingY - m->height,
  				m->horiBearingX + m->width,
  				m->horiBearingY);
  		/* Print the glyph points. */
  		o = &face->glyph->outline;
  		for (j = 0; j < o->n_points; j++) {
  			if (j != 0) {
  				printf(", ");
  			}
  			printf("%ld %ld %d", o->points[j].x, o->points[j].y, o->tags[j] & 0x01);
  		}
  		printf("\n");
  	}
  	return 0;
  }
  