Add freetype example

Author: ebraminio

freetype-render.c

@@ -0,0 +1,33 @@
+// gcc freetype-render.c `pkg-config --libs --cflags freetype2` -Wall && a.out
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+#include FT_GLYPH_H
+
+int main() {
+  FT_Library library;
+  FT_Init_FreeType(&library);
+  FT_Face face;
+  FT_New_Face(library, "input/Roboto.abc.ttf", 0, &face);
+  FT_Set_Char_Size(face, 36 * 64, 36 * 64, 0, 0);
+
+  FT_Load_Glyph(face, 2 /* gid=3 is 'b' in this particular font */,
+                FT_LOAD_DEFAULT);
+
+  FT_GlyphSlot slot = face->glyph;
+  FT_Render_Glyph(slot, FT_RENDER_MODE_NORMAL);
+
+  unsigned width = slot->bitmap.width;
+  unsigned height = slot->bitmap.rows;
+
+  FILE *f = fopen("out.pbm", "wb");
+  fprintf(f, "P5 %d %d %d\n", width, height, slot->bitmap.num_grays - 1);
+  fwrite(slot->bitmap.buffer, sizeof(char), width * height, f);
+  fclose(f);
+
+  FT_Done_Face(face);
+  FT_Done_FreeType(library);
+  return 0;
+}