[HB] Add abstract font and face API
Not used yet.
diff --git a/src/hb-font.h b/src/hb-font.h
new file mode 100644
index 0000000..d287145
--- /dev/null
+++ b/src/hb-font.h
@@ -0,0 +1,182 @@
+/*
+ * Copyright (C) 2009 Red Hat, Inc.
+ *
+ * This is part of HarfBuzz, an OpenType Layout engine library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Red Hat Author(s): Behdad Esfahbod
+ */
+
+#ifndef HB_FONT_H
+#define HB_FONT_H
+
+#include "hb-common.h"
+
+HB_BEGIN_DECLS
+
+/*
+ * hb_font_callbacks_t
+ */
+
+hb_font_callbacks_t *
+hb_font_callbacks_create (void);
+
+hb_font_callbacks_t *
+hb_font_callbacks_reference (hb_font_callbacks_t *fcallbacks);
+
+void
+hb_font_callbacks_destroy (hb_font_callbacks_t *fcallbacks);
+
+hb_font_callbacks_t *
+hb_font_callbacks_duplicate (hb_font_callbacks_t *fcallbacks);
+
+/*
+
+void
+hb_font_callbacks_set_glyph_func (hb_font_callbacks_t *fcallbacks,
+ hb_font_get_glyph_func_t glyph_func);
+
+void
+hb_font_callbacks_set_contour_point_func (hb_font_callbacks_t *fcallbacks,
+ hb_font_get_contour_point_func_t contour_point_func);
+
+void
+hb_font_callbacks_set_glyph_metrics_func (hb_font_callbacks_t *fcallbacks,
+ hb_font_get_glyph_metrics_func_t glyph_metrics_func);
+
+void
+hb_font_callbacks_set_kerning_func (hb_font_callbacks_t *fcallbacks,
+ hb_font_get_kerning_func_t kerning_func);
+
+*/
+
+
+/*
+ * hb_unicode_callbacks_t
+ */
+
+hb_unicode_callbacks_t *
+hb_unicode_callbacks_create (void);
+
+hb_unicode_callbacks_t *
+hb_unicode_callbacks_reference (hb_unicode_callbacks_t *ucallbacks);
+
+void
+hb_unicode_callbacks_destroy (hb_unicode_callbacks_t *ucallbacks);
+
+hb_unicode_callbacks_t *
+hb_unicode_callbacks_duplicate (hb_unicode_callbacks_t *ucallbacks);
+
+/*
+
+void
+hb_unicode_callbacks_set_general_category_func (hb_unicode_callbacks_t *ucallbacks,
+ hb_unicode_get_general_category_func_t general_category_func);
+
+void
+hb_unicode_callbacks_set_combining_class_func (hb_unicode_callbacks_t *ucallbacks,
+ hb_unicode_get_combining_class_func_t combining_class_func);
+
+void
+hb_unicode_callbacks_set_mirroring_char_func (hb_unicode_callbacks_t *ucallbacks,
+ hb_unicode_get_mirroring_char_func_t mirroring_char_func);
+
+void
+hb_unicode_callbacks_set_script_func (hb_unicode_callbacks_t *ucallbacks,
+ hb_unicode_get_script_func_t script_func);
+
+void
+hb_unicode_callbacks_set_eastasian_width_func (hb_unicode_callbacks_t *ucallbacks,
+ hb_unicode_get_eastasian_width_func_t eastasian_width_func);
+
+*/
+
+
+/*
+ * hb_face_t
+ */
+
+hb_face_t *
+hb_face_create_for_data (hb_blob_t *blob,
+ unsigned int index);
+
+/* calls destory() when not needing user_data anymore */
+hb_face_t *
+hb_face_create_for_tables (hb_get_table_func_t get_table,
+ hb_destroy_func_t destroy,
+ void *user_data);
+
+hb_face_t *
+hb_face_reference (hb_face_t *face);
+
+void
+hb_face_destroy (hb_face_t *face);
+
+void
+hb_face_set_font_callbacks (hb_face_t *face,
+ hb_font_callbacks_t *fcallbacks);
+
+void
+hb_face_set_unicode_callbacks (hb_face_t *face,
+ hb_unicode_callbacks_t *ucallbacks);
+
+
+
+/*
+ * hb_font_t
+ */
+
+/* Fonts are very light-weight objects */
+
+hb_font_t *
+hb_font_create (hb_face_t *face);
+
+hb_font_t *
+hb_font_reference (hb_font_t *font);
+
+void
+hb_font_destroy (hb_font_t *font);
+
+/*
+ * XXX
+ * should we decompose this to units_per_EM and font-size?
+ * units_per_EM setting then can go into the face, or better,
+ * read from the 'head' table.
+ *
+ * Then we either need size+shape like freetype does, or a full
+ * matrix.
+ */
+void
+hb_font_set_scale (hb_font_t *font,
+ hb_16dot16_t x_scale,
+ hb_16dot16_t y_scale);
+
+/*
+ * A zero value means "no hinting in that direction"
+ */
+void
+hb_font_set_ppem (hb_font_t *font,
+ unsigned int x_ppem,
+ unsigned int y_ppem);
+
+
+HB_END_DECLS
+
+#endif /* HB_FONT_H */
