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diff --git a/libass/ass_drawing.h b/libass/ass_drawing.h
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+++ b/libass/ass_drawing.h
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+/*
+ * Copyright (C) 2009 Grigori Goronzy <greg@geekmind.org>
+ *
+ * This file is part of libass.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef LIBASS_DRAWING_H
+#define LIBASS_DRAWING_H
+
+#include <ft2build.h>
+#include FT_GLYPH_H
+
+#include "ass.h"
+
+#define DRAWING_INITIAL_SIZE 256
+
+enum ass_token_type {
+    TOKEN_MOVE,
+    TOKEN_MOVE_NC,
+    TOKEN_LINE,
+    TOKEN_CUBIC_BEZIER,
+    TOKEN_CONIC_BEZIER,
+    TOKEN_B_SPLINE,
+    TOKEN_EXTEND_SPLINE,
+    TOKEN_CLOSE
+};
+
+typedef struct ass_drawing_token_s {
+    enum ass_token_type type;
+    FT_Vector point;
+    struct ass_drawing_token_s *next;
+    struct ass_drawing_token_s *prev;
+} ass_drawing_token_t;
+
+typedef struct ass_drawing_s {
+    char *text; // drawing string
+    int i;      // text index
+    int scale;  // scale (1-64) for subpixel accuracy
+    double pbo; // drawing will be shifted in y direction by this amount
+    double scale_x;     // FontScaleX
+    double scale_y;     // FontScaleY
+    int asc;            // ascender
+    int desc;           // descender
+    FT_OutlineGlyph glyph;  // the "fake" glyph created for later rendering
+    int hash;           // hash value (for caching)
+
+    // private
+    FT_Library ftlibrary;   // FT library instance, needed for font ops
+    int size;           // current buffer size
+    ass_drawing_token_t *tokens;    // tokenized drawing
+    int max_points;     // current maximum size
+    int max_contours;
+    double point_scale_x;
+    double point_scale_y;
+} ass_drawing_t;
+
+ass_drawing_t *ass_drawing_new(void *fontconfig_priv, ass_font_t *font,
+                               ass_hinting_t hint, FT_Library lib);
+void ass_drawing_free(ass_drawing_t* drawing);
+void ass_drawing_add_char(ass_drawing_t* drawing, char symbol);
+void ass_drawing_hash(ass_drawing_t* drawing);
+FT_OutlineGlyph *ass_drawing_parse(ass_drawing_t *drawing);
+
+#endif /* LIBASS_DRAWING_H */