345 lines
8.9 KiB
C
345 lines
8.9 KiB
C
/*
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* Copyright © 1998-2004 David Turner and Werner Lemberg
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* Copyright © 2004,2007,2009 Red Hat, Inc.
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* Copyright © 2011,2012 Google, 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): Owen Taylor, Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_H_IN
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#error "Include <hb.h> instead."
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#endif
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#ifndef HB_BUFFER_H
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#define HB_BUFFER_H
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#include "hb-common.h"
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#include "hb-unicode.h"
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#include "hb-font.h"
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HB_BEGIN_DECLS
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typedef struct hb_glyph_info_t {
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hb_codepoint_t codepoint;
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hb_mask_t mask;
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uint32_t cluster;
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/*< private >*/
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hb_var_int_t var1;
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hb_var_int_t var2;
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} hb_glyph_info_t;
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typedef struct hb_glyph_position_t {
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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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/*< private >*/
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hb_var_int_t var;
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} hb_glyph_position_t;
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typedef struct hb_segment_properties_t {
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hb_direction_t direction;
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hb_script_t script;
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hb_language_t language;
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/*< private >*/
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void *reserved1;
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void *reserved2;
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} hb_segment_properties_t;
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#define HB_SEGMENT_PROPERTIES_DEFAULT {HB_DIRECTION_INVALID, \
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HB_SCRIPT_INVALID, \
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HB_LANGUAGE_INVALID, \
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NULL, \
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NULL}
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hb_bool_t
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hb_segment_properties_equal (const hb_segment_properties_t *a,
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const hb_segment_properties_t *b);
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unsigned int
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hb_segment_properties_hash (const hb_segment_properties_t *p);
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/*
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* hb_buffer_t
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*/
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typedef struct hb_buffer_t hb_buffer_t;
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hb_buffer_t *
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hb_buffer_create (void);
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hb_buffer_t *
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hb_buffer_get_empty (void);
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hb_buffer_t *
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hb_buffer_reference (hb_buffer_t *buffer);
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void
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hb_buffer_destroy (hb_buffer_t *buffer);
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hb_bool_t
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hb_buffer_set_user_data (hb_buffer_t *buffer,
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hb_user_data_key_t *key,
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void * data,
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hb_destroy_func_t destroy,
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hb_bool_t replace);
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void *
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hb_buffer_get_user_data (hb_buffer_t *buffer,
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hb_user_data_key_t *key);
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typedef enum {
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HB_BUFFER_CONTENT_TYPE_INVALID = 0,
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HB_BUFFER_CONTENT_TYPE_UNICODE,
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HB_BUFFER_CONTENT_TYPE_GLYPHS
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} hb_buffer_content_type_t;
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void
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hb_buffer_set_content_type (hb_buffer_t *buffer,
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hb_buffer_content_type_t content_type);
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hb_buffer_content_type_t
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hb_buffer_get_content_type (hb_buffer_t *buffer);
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void
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hb_buffer_set_unicode_funcs (hb_buffer_t *buffer,
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hb_unicode_funcs_t *unicode_funcs);
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hb_unicode_funcs_t *
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hb_buffer_get_unicode_funcs (hb_buffer_t *buffer);
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void
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hb_buffer_set_direction (hb_buffer_t *buffer,
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hb_direction_t direction);
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hb_direction_t
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hb_buffer_get_direction (hb_buffer_t *buffer);
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void
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hb_buffer_set_script (hb_buffer_t *buffer,
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hb_script_t script);
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hb_script_t
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hb_buffer_get_script (hb_buffer_t *buffer);
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void
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hb_buffer_set_language (hb_buffer_t *buffer,
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hb_language_t language);
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hb_language_t
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hb_buffer_get_language (hb_buffer_t *buffer);
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void
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hb_buffer_set_segment_properties (hb_buffer_t *buffer,
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const hb_segment_properties_t *props);
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void
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hb_buffer_get_segment_properties (hb_buffer_t *buffer,
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hb_segment_properties_t *props);
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void
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hb_buffer_guess_segment_properties (hb_buffer_t *buffer);
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typedef enum { /*< flags >*/
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HB_BUFFER_FLAG_DEFAULT = 0x00000000u,
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HB_BUFFER_FLAG_BOT = 0x00000001u, /* Beginning-of-text */
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HB_BUFFER_FLAG_EOT = 0x00000002u, /* End-of-text */
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HB_BUFFER_FLAG_PRESERVE_DEFAULT_IGNORABLES = 0x00000004u
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} hb_buffer_flags_t;
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void
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hb_buffer_set_flags (hb_buffer_t *buffer,
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hb_buffer_flags_t flags);
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hb_buffer_flags_t
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hb_buffer_get_flags (hb_buffer_t *buffer);
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#define HB_BUFFER_REPLACEMENT_CODEPOINT_DEFAULT 0xFFFDu
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/* Sets codepoint used to replace invalid UTF-8/16/32 entries.
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* Default is 0xFFFDu. */
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void
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hb_buffer_set_replacement_codepoint (hb_buffer_t *buffer,
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hb_codepoint_t replacement);
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hb_codepoint_t
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hb_buffer_get_replacement_codepoint (hb_buffer_t *buffer);
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/* Resets the buffer. Afterwards it's as if it was just created,
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* except that it has a larger buffer allocated perhaps... */
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void
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hb_buffer_reset (hb_buffer_t *buffer);
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/* Like reset, but does NOT clear unicode_funcs and replacement_codepoint. */
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void
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hb_buffer_clear_contents (hb_buffer_t *buffer);
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/* Returns false if allocation failed */
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hb_bool_t
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hb_buffer_pre_allocate (hb_buffer_t *buffer,
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unsigned int size);
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/* Returns false if allocation has failed before */
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hb_bool_t
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hb_buffer_allocation_successful (hb_buffer_t *buffer);
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void
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hb_buffer_reverse (hb_buffer_t *buffer);
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void
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hb_buffer_reverse_clusters (hb_buffer_t *buffer);
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/* Filling the buffer in */
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void
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hb_buffer_add (hb_buffer_t *buffer,
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hb_codepoint_t codepoint,
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unsigned int cluster);
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void
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hb_buffer_add_utf8 (hb_buffer_t *buffer,
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const char *text,
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int text_length,
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unsigned int item_offset,
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int item_length);
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void
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hb_buffer_add_utf16 (hb_buffer_t *buffer,
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const uint16_t *text,
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int text_length,
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unsigned int item_offset,
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int item_length);
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void
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hb_buffer_add_utf32 (hb_buffer_t *buffer,
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const uint32_t *text,
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int text_length,
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unsigned int item_offset,
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int item_length);
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/* Like add_utf32 but does NOT check for invalid Unicode codepoints. */
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void
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hb_buffer_add_codepoints (hb_buffer_t *buffer,
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const hb_codepoint_t *text,
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int text_length,
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unsigned int item_offset,
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int item_length);
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/* Clears any new items added at the end */
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hb_bool_t
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hb_buffer_set_length (hb_buffer_t *buffer,
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unsigned int length);
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/* Return value valid as long as buffer not modified */
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unsigned int
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hb_buffer_get_length (hb_buffer_t *buffer);
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/* Getting glyphs out of the buffer */
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/* Return value valid as long as buffer not modified */
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hb_glyph_info_t *
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hb_buffer_get_glyph_infos (hb_buffer_t *buffer,
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unsigned int *length);
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/* Return value valid as long as buffer not modified */
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hb_glyph_position_t *
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hb_buffer_get_glyph_positions (hb_buffer_t *buffer,
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unsigned int *length);
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/* Reorders a glyph buffer to have canonical in-cluster glyph order / position.
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* The resulting clusters should behave identical to pre-reordering clusters.
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* NOTE: This has nothing to do with Unicode normalization. */
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void
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hb_buffer_normalize_glyphs (hb_buffer_t *buffer);
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/*
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* Serialize
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*/
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typedef enum { /*< flags >*/
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HB_BUFFER_SERIALIZE_FLAG_DEFAULT = 0x00000000u,
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HB_BUFFER_SERIALIZE_FLAG_NO_CLUSTERS = 0x00000001u,
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HB_BUFFER_SERIALIZE_FLAG_NO_POSITIONS = 0x00000002u,
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HB_BUFFER_SERIALIZE_FLAG_NO_GLYPH_NAMES = 0x00000004u
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} hb_buffer_serialize_flags_t;
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typedef enum {
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HB_BUFFER_SERIALIZE_FORMAT_TEXT = HB_TAG('T','E','X','T'),
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HB_BUFFER_SERIALIZE_FORMAT_JSON = HB_TAG('J','S','O','N'),
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HB_BUFFER_SERIALIZE_FORMAT_INVALID = HB_TAG_NONE
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} hb_buffer_serialize_format_t;
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/* len=-1 means str is NUL-terminated. */
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hb_buffer_serialize_format_t
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hb_buffer_serialize_format_from_string (const char *str, int len);
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const char *
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hb_buffer_serialize_format_to_string (hb_buffer_serialize_format_t format);
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const char **
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hb_buffer_serialize_list_formats (void);
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/* Returns number of items, starting at start, that were serialized. */
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unsigned int
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hb_buffer_serialize_glyphs (hb_buffer_t *buffer,
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unsigned int start,
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unsigned int end,
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char *buf,
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unsigned int buf_size,
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unsigned int *buf_consumed, /* May be NULL */
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hb_font_t *font, /* May be NULL */
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hb_buffer_serialize_format_t format,
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hb_buffer_serialize_flags_t flags);
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hb_bool_t
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hb_buffer_deserialize_glyphs (hb_buffer_t *buffer,
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const char *buf,
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int buf_len, /* -1 means nul-terminated */
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const char **end_ptr, /* May be NULL */
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hb_font_t *font, /* May be NULL */
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hb_buffer_serialize_format_t format);
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HB_END_DECLS
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#endif /* HB_BUFFER_H */
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