/*
* Copyright © 1998-2004 David Turner and Werner Lemberg
* Copyright © 2004,2007,2009,2010 Red Hat, Inc.
* Copyright © 2011 Google, Inc.
*
* This is part of HarfBuzz, a text shaping 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): Owen Taylor, Behdad Esfahbod
* Google Author(s): Behdad Esfahbod
*/
#ifndef HB_BUFFER_PRIVATE_HH
#define HB_BUFFER_PRIVATE_HH
#include "hb-private.hh"
#include "hb-buffer.h"
#include "hb-object-private.hh"
#include "hb-unicode-private.hh"
ASSERT_STATIC (sizeof (hb_glyph_info_t) == 20);
ASSERT_STATIC (sizeof (hb_glyph_info_t) == sizeof (hb_glyph_position_t));
typedef struct _hb_segment_properties_t {
hb_direction_t direction;
hb_script_t script;
hb_language_t language;
} hb_segment_properties_t;
struct _hb_buffer_t {
hb_object_header_t header;
/* Information about how the text in the buffer should be treated */
hb_unicode_funcs_t *unicode; /* Unicode functions */
hb_segment_properties_t props; /* Script, language, direction */
/* Buffer contents */
bool in_error; /* Allocation failed */
bool have_output; /* Whether we have an output buffer going on */
bool have_positions; /* Whether we have positions */
unsigned int idx; /* Cursor into ->info and ->pos arrays */
unsigned int len; /* Length of ->info and ->pos arrays */
unsigned int out_len; /* Length of ->out array if have_output */
unsigned int allocated; /* Length of allocated arrays */
hb_glyph_info_t *info;
hb_glyph_info_t *out_info;
hb_glyph_position_t *pos;
unsigned int serial;
uint8_t allocated_var_bytes[8];
const char *allocated_var_owner[8];
/* Methods */
HB_INTERNAL void reset (void);
inline unsigned int backtrack_len (void) const
{ return have_output? out_len : idx; }
inline unsigned int next_serial (void) { return serial++; }
HB_INTERNAL void allocate_var (unsigned int byte_i, unsigned int count, const char *owner);
HB_INTERNAL void deallocate_var (unsigned int byte_i, unsigned int count, const char *owner);
HB_INTERNAL void deallocate_var_all (void);
HB_INTERNAL void add (hb_codepoint_t codepoint,
hb_mask_t mask,
unsigned int cluster);
HB_INTERNAL void reverse_range (unsigned int start, unsigned int end);
HB_INTERNAL void reverse (void);
HB_INTERNAL void reverse_clusters (void);
HB_INTERNAL void guess_properties (void);
HB_INTERNAL void swap_buffers (void);
HB_INTERNAL void clear_output (void);
HB_INTERNAL void clear_positions (void);
HB_INTERNAL void replace_glyphs_be16 (unsigned int num_in,
unsigned int num_out,
const uint16_t *glyph_data_be);
HB_INTERNAL void replace_glyphs (unsigned int num_in,
unsigned int num_out,
const hb_codepoint_t *glyph_data);
HB_INTERNAL void replace_glyph (hb_codepoint_t glyph_index);
/* Makes a copy of the glyph at idx to output and replace glyph_index */
HB_INTERNAL void output_glyph (hb_codepoint_t glyph_index);
/* Copies glyph at idx to output but doesn't advance idx */
HB_INTERNAL void copy_glyph (void);
/* Copies glyph at idx to output and advance idx.
* If there's no output, just advance idx. */
HB_INTERNAL void next_glyph (void);
/* Advance idx without copying to output. */
inline void skip_glyph (void) { idx++; }
inline void reset_masks (hb_mask_t mask)
{
for (unsigned int j = 0; j < len; j++)
info[j].mask = mask;
}
inline void add_masks (hb_mask_t mask)
{
for (unsigned int j = 0; j < len; j++)
info[j].mask |= mask;
}
HB_INTERNAL void set_masks (hb_mask_t value,
hb_mask_t mask,
unsigned int cluster_start,
unsigned int cluster_end);
HB_INTERNAL void merge_clusters (unsigned int start,
unsigned int end);
HB_INTERNAL void merge_out_clusters (unsigned int start,
unsigned int end);
/* Internal methods */
HB_INTERNAL bool enlarge (unsigned int size);
inline bool ensure (unsigned int size)
{ return likely (size <= allocated) ? TRUE : enlarge (size); }
HB_INTERNAL bool make_room_for (unsigned int num_in, unsigned int num_out);
HB_INTERNAL void *get_scratch_buffer (unsigned int *size);
};
#define HB_BUFFER_XALLOCATE_VAR(b, func, var, owner) \
b->func (offsetof (hb_glyph_info_t, var) - offsetof(hb_glyph_info_t, var1), \
sizeof (b->info[0].var), owner)
#define HB_BUFFER_ALLOCATE_VAR(b, var) \
HB_BUFFER_XALLOCATE_VAR (b, allocate_var, var (), #var)
#define HB_BUFFER_DEALLOCATE_VAR(b, var) \
HB_BUFFER_XALLOCATE_VAR (b, deallocate_var, var (), #var)
#endif /* HB_BUFFER_PRIVATE_HH */
