hb-font.h

/*
 * 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"
#include "hb-blob.h"

HB_BEGIN_DECLS

typedef struct _hb_font_callbacks_t hb_font_callbacks_t;
typedef struct _hb_unicode_callbacks_t hb_unicode_callbacks_t;

typedef struct _hb_face_t hb_face_t;
typedef struct _hb_font_t hb_font_t;

typedef hb_blob_t * (*hb_get_table_func_t)  (hb_tag_t tag, void *user_data);


/*
 * 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);

unsigned int
hb_font_callbacks_get_reference_count (hb_font_callbacks_t *fcallbacks);

void
hb_font_callbacks_destroy (hb_font_callbacks_t *fcallbacks);

hb_font_callbacks_t *
hb_font_callbacks_copy (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);

unsigned int
hb_unicode_callbacks_get_reference_count (hb_unicode_callbacks_t *ucallbacks);

void
hb_unicode_callbacks_destroy (hb_unicode_callbacks_t *ucallbacks);

hb_unicode_callbacks_t *
hb_unicode_callbacks_copy (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);

unsigned int
hb_face_get_reference_count (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_blob_t *
hb_face_get_table (hb_face_t *face,
		   hb_tag_t tag);


/*
 * 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);

unsigned int
hb_font_get_reference_count (hb_font_t *font);

void
hb_font_destroy (hb_font_t *font);

hb_face_t *
hb_font_get_face (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 */