240 lines
6.2 KiB
C
240 lines
6.2 KiB
C
/*
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* Copyright (C) 2009 Red Hat, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Behdad Esfahbod
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*/
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#ifndef HB_FONT_H
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#define HB_FONT_H
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#include "hb-common.h"
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#include "hb-blob.h"
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HB_BEGIN_DECLS
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typedef struct _hb_face_t hb_face_t;
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typedef struct _hb_font_t hb_font_t;
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/*
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* hb_face_t
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*/
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hb_face_t *
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hb_face_create_for_data (hb_blob_t *blob,
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unsigned int index);
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typedef hb_blob_t * (*hb_get_table_func_t) (hb_tag_t tag, void *user_data);
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/* calls destroy() when not needing user_data anymore */
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hb_face_t *
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hb_face_create_for_tables (hb_get_table_func_t get_table,
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hb_destroy_func_t destroy,
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void *user_data);
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hb_face_t *
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hb_face_reference (hb_face_t *face);
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unsigned int
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hb_face_get_reference_count (hb_face_t *face);
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void
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hb_face_destroy (hb_face_t *face);
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/* Returns NULL if not found */
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hb_blob_t *
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hb_face_get_table (hb_face_t *face,
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hb_tag_t tag);
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/*
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* hb_font_funcs_t
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*/
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typedef struct _hb_font_funcs_t hb_font_funcs_t;
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hb_font_funcs_t *
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hb_font_funcs_create (void);
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hb_font_funcs_t *
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hb_font_funcs_reference (hb_font_funcs_t *ffuncs);
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unsigned int
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hb_font_funcs_get_reference_count (hb_font_funcs_t *ffuncs);
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void
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hb_font_funcs_destroy (hb_font_funcs_t *ffuncs);
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hb_font_funcs_t *
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hb_font_funcs_copy (hb_font_funcs_t *ffuncs);
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void
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hb_font_funcs_make_immutable (hb_font_funcs_t *ffuncs);
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hb_bool_t
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hb_font_funcs_is_immutable (hb_font_funcs_t *ffuncs);
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/* funcs */
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typedef struct _hb_glyph_metrics_t
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{
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hb_position_t x_advance;
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hb_position_t y_advance;
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hb_position_t x_offset;
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hb_position_t y_offset;
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hb_position_t width;
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hb_position_t height;
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} hb_glyph_metrics_t;
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typedef hb_codepoint_t (*hb_font_get_glyph_func_t) (hb_font_t *font, hb_face_t *face, const void *user_data,
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hb_codepoint_t unicode, hb_codepoint_t variation_selector);
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typedef hb_bool_t (*hb_font_get_contour_point_func_t) (hb_font_t *font, hb_face_t *face, const void *user_data,
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unsigned int point_index,
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hb_codepoint_t glyph, hb_position_t *x, hb_position_t *y);
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typedef void (*hb_font_get_glyph_metrics_func_t) (hb_font_t *font, hb_face_t *face, const void *user_data,
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hb_codepoint_t glyph, hb_glyph_metrics_t *metrics);
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typedef hb_position_t (*hb_font_get_kerning_func_t) (hb_font_t *font, hb_face_t *face, const void *user_data,
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hb_codepoint_t first_glyph, hb_codepoint_t second_glyph);
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void
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hb_font_funcs_set_glyph_func (hb_font_funcs_t *ffuncs,
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hb_font_get_glyph_func_t glyph_func);
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void
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hb_font_funcs_set_contour_point_func (hb_font_funcs_t *ffuncs,
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hb_font_get_contour_point_func_t contour_point_func);
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void
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hb_font_funcs_set_glyph_metrics_func (hb_font_funcs_t *ffuncs,
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hb_font_get_glyph_metrics_func_t glyph_metrics_func);
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void
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hb_font_funcs_set_kerning_func (hb_font_funcs_t *ffuncs,
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hb_font_get_kerning_func_t kerning_func);
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/* These never return NULL. Return fallback defaults instead. */
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hb_font_get_glyph_func_t
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hb_font_funcs_get_glyph_func (hb_font_funcs_t *ffuncs);
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hb_font_get_contour_point_func_t
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hb_font_funcs_get_contour_point_func (hb_font_funcs_t *ffuncs);
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hb_font_get_glyph_metrics_func_t
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hb_font_funcs_get_glyph_metrics_func (hb_font_funcs_t *ffuncs);
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hb_font_get_kerning_func_t
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hb_font_funcs_get_kerning_func (hb_font_funcs_t *ffuncs);
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hb_codepoint_t
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hb_font_get_glyph (hb_font_t *font, hb_face_t *face,
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hb_codepoint_t unicode, hb_codepoint_t variation_selector);
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hb_bool_t
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hb_font_get_contour_point (hb_font_t *font, hb_face_t *face,
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unsigned int point_index,
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hb_codepoint_t glyph, hb_position_t *x, hb_position_t *y);
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void
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hb_font_get_glyph_metrics (hb_font_t *font, hb_face_t *face,
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hb_codepoint_t glyph, hb_glyph_metrics_t *metrics);
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hb_position_t
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hb_font_get_kerning (hb_font_t *font, hb_face_t *face,
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hb_codepoint_t first_glyph, hb_codepoint_t second_glyph);
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/*
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* hb_font_t
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*/
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/* Fonts are very light-weight objects */
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hb_font_t *
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hb_font_create (void);
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hb_font_t *
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hb_font_reference (hb_font_t *font);
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unsigned int
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hb_font_get_reference_count (hb_font_t *font);
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void
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hb_font_destroy (hb_font_t *font);
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void
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hb_font_set_funcs (hb_font_t *font,
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hb_font_funcs_t *klass,
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hb_destroy_func_t destroy,
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void *user_data);
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/* Returns what was set and unsets it, but doesn't destroy(user_data).
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* This is useful for wrapping / chaining font_funcs_t's.
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*
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* The client is responsible for:
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*
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* - Take ownership of the reference on the returned klass
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* - Calling "destroy(user_data)" exactly once if returned destroy func
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* is not NULL and the returned info is not needed anymore.
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*/
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void
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hb_font_unset_funcs (hb_font_t *font,
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hb_font_funcs_t **klass,
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hb_destroy_func_t *destroy,
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void **user_data);
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/*
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* We should add support for full matrices.
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*/
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void
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hb_font_set_scale (hb_font_t *font,
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unsigned int x_scale,
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unsigned int y_scale);
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void
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hb_font_get_scale (hb_font_t *font,
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unsigned int *x_scale,
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unsigned int *y_scale);
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/*
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* A zero value means "no hinting in that direction"
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*/
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void
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hb_font_set_ppem (hb_font_t *font,
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unsigned int x_ppem,
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unsigned int y_ppem);
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void
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hb_font_get_ppem (hb_font_t *font,
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unsigned int *x_ppem,
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unsigned int *y_ppem);
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HB_END_DECLS
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#endif /* HB_FONT_H */
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