1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/harfbuzz/src/hb-buffer-private.hh Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,206 @@
1.4 +/*
1.5 + * Copyright © 1998-2004 David Turner and Werner Lemberg
1.6 + * Copyright © 2004,2007,2009,2010 Red Hat, Inc.
1.7 + * Copyright © 2011,2012 Google, Inc.
1.8 + *
1.9 + * This is part of HarfBuzz, a text shaping library.
1.10 + *
1.11 + * Permission is hereby granted, without written agreement and without
1.12 + * license or royalty fees, to use, copy, modify, and distribute this
1.13 + * software and its documentation for any purpose, provided that the
1.14 + * above copyright notice and the following two paragraphs appear in
1.15 + * all copies of this software.
1.16 + *
1.17 + * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
1.18 + * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
1.19 + * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
1.20 + * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
1.21 + * DAMAGE.
1.22 + *
1.23 + * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
1.24 + * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
1.25 + * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
1.26 + * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
1.27 + * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
1.28 + *
1.29 + * Red Hat Author(s): Owen Taylor, Behdad Esfahbod
1.30 + * Google Author(s): Behdad Esfahbod
1.31 + */
1.32 +
1.33 +#ifndef HB_BUFFER_PRIVATE_HH
1.34 +#define HB_BUFFER_PRIVATE_HH
1.35 +
1.36 +#include "hb-private.hh"
1.37 +#include "hb-object-private.hh"
1.38 +#include "hb-unicode-private.hh"
1.39 +
1.40 +
1.41 +ASSERT_STATIC (sizeof (hb_glyph_info_t) == 20);
1.42 +ASSERT_STATIC (sizeof (hb_glyph_info_t) == sizeof (hb_glyph_position_t));
1.43 +
1.44 +
1.45 +/*
1.46 + * hb_buffer_t
1.47 + */
1.48 +
1.49 +struct hb_buffer_t {
1.50 + hb_object_header_t header;
1.51 + ASSERT_POD ();
1.52 +
1.53 + /* Information about how the text in the buffer should be treated */
1.54 +
1.55 + hb_unicode_funcs_t *unicode; /* Unicode functions */
1.56 + hb_segment_properties_t props; /* Script, language, direction */
1.57 + hb_buffer_flags_t flags; /* BOT / EOT / etc. */
1.58 +
1.59 + /* Buffer contents */
1.60 +
1.61 + hb_buffer_content_type_t content_type;
1.62 +
1.63 + bool in_error; /* Allocation failed */
1.64 + bool have_output; /* Whether we have an output buffer going on */
1.65 + bool have_positions; /* Whether we have positions */
1.66 +
1.67 + unsigned int idx; /* Cursor into ->info and ->pos arrays */
1.68 + unsigned int len; /* Length of ->info and ->pos arrays */
1.69 + unsigned int out_len; /* Length of ->out array if have_output */
1.70 +
1.71 + unsigned int allocated; /* Length of allocated arrays */
1.72 + hb_glyph_info_t *info;
1.73 + hb_glyph_info_t *out_info;
1.74 + hb_glyph_position_t *pos;
1.75 +
1.76 + inline hb_glyph_info_t &cur (unsigned int i = 0) { return info[idx + i]; }
1.77 + inline hb_glyph_info_t cur (unsigned int i = 0) const { return info[idx + i]; }
1.78 +
1.79 + inline hb_glyph_position_t &cur_pos (unsigned int i = 0) { return pos[idx + i]; }
1.80 + inline hb_glyph_position_t cur_pos (unsigned int i = 0) const { return pos[idx + i]; }
1.81 +
1.82 + inline hb_glyph_info_t &prev (void) { return out_info[out_len - 1]; }
1.83 + inline hb_glyph_info_t prev (void) const { return info[out_len - 1]; }
1.84 +
1.85 + inline bool has_separate_output (void) const { return info != out_info; }
1.86 +
1.87 + unsigned int serial;
1.88 +
1.89 + /* These reflect current allocations of the bytes in glyph_info_t's var1 and var2. */
1.90 + uint8_t allocated_var_bytes[8];
1.91 + const char *allocated_var_owner[8];
1.92 +
1.93 + /* Text before / after the main buffer contents.
1.94 + * Always in Unicode, and ordered outward.
1.95 + * Index 0 is for "pre-context", 1 for "post-context". */
1.96 + static const unsigned int CONTEXT_LENGTH = 5;
1.97 + hb_codepoint_t context[2][CONTEXT_LENGTH];
1.98 + unsigned int context_len[2];
1.99 +
1.100 +
1.101 + /* Methods */
1.102 +
1.103 + HB_INTERNAL void reset (void);
1.104 + HB_INTERNAL void clear (void);
1.105 +
1.106 + inline unsigned int backtrack_len (void) const
1.107 + { return have_output? out_len : idx; }
1.108 + inline unsigned int lookahead_len (void) const
1.109 + { return len - idx; }
1.110 + inline unsigned int next_serial (void) { return serial++; }
1.111 +
1.112 + HB_INTERNAL void allocate_var (unsigned int byte_i, unsigned int count, const char *owner);
1.113 + HB_INTERNAL void deallocate_var (unsigned int byte_i, unsigned int count, const char *owner);
1.114 + HB_INTERNAL void assert_var (unsigned int byte_i, unsigned int count, const char *owner);
1.115 + HB_INTERNAL void deallocate_var_all (void);
1.116 +
1.117 + HB_INTERNAL void add (hb_codepoint_t codepoint,
1.118 + unsigned int cluster);
1.119 + HB_INTERNAL void add_info (const hb_glyph_info_t &glyph_info);
1.120 +
1.121 + HB_INTERNAL void reverse_range (unsigned int start, unsigned int end);
1.122 + HB_INTERNAL void reverse (void);
1.123 + HB_INTERNAL void reverse_clusters (void);
1.124 + HB_INTERNAL void guess_segment_properties (void);
1.125 +
1.126 + HB_INTERNAL void swap_buffers (void);
1.127 + HB_INTERNAL void remove_output (void);
1.128 + HB_INTERNAL void clear_output (void);
1.129 + HB_INTERNAL void clear_positions (void);
1.130 +
1.131 + HB_INTERNAL void replace_glyphs (unsigned int num_in,
1.132 + unsigned int num_out,
1.133 + const hb_codepoint_t *glyph_data);
1.134 +
1.135 + HB_INTERNAL void replace_glyph (hb_codepoint_t glyph_index);
1.136 + /* Makes a copy of the glyph at idx to output and replace glyph_index */
1.137 + HB_INTERNAL void output_glyph (hb_codepoint_t glyph_index);
1.138 + HB_INTERNAL void output_info (const hb_glyph_info_t &glyph_info);
1.139 + /* Copies glyph at idx to output but doesn't advance idx */
1.140 + HB_INTERNAL void copy_glyph (void);
1.141 + HB_INTERNAL bool move_to (unsigned int i); /* i is output-buffer index. */
1.142 + /* Copies glyph at idx to output and advance idx.
1.143 + * If there's no output, just advance idx. */
1.144 + inline void
1.145 + next_glyph (void)
1.146 + {
1.147 + if (have_output)
1.148 + {
1.149 + if (unlikely (out_info != info || out_len != idx)) {
1.150 + if (unlikely (!make_room_for (1, 1))) return;
1.151 + out_info[out_len] = info[idx];
1.152 + }
1.153 + out_len++;
1.154 + }
1.155 +
1.156 + idx++;
1.157 + }
1.158 +
1.159 + /* Advance idx without copying to output. */
1.160 + inline void skip_glyph (void) { idx++; }
1.161 +
1.162 + inline void reset_masks (hb_mask_t mask)
1.163 + {
1.164 + for (unsigned int j = 0; j < len; j++)
1.165 + info[j].mask = mask;
1.166 + }
1.167 + inline void add_masks (hb_mask_t mask)
1.168 + {
1.169 + for (unsigned int j = 0; j < len; j++)
1.170 + info[j].mask |= mask;
1.171 + }
1.172 + HB_INTERNAL void set_masks (hb_mask_t value,
1.173 + hb_mask_t mask,
1.174 + unsigned int cluster_start,
1.175 + unsigned int cluster_end);
1.176 +
1.177 + HB_INTERNAL void merge_clusters (unsigned int start,
1.178 + unsigned int end);
1.179 + HB_INTERNAL void merge_out_clusters (unsigned int start,
1.180 + unsigned int end);
1.181 +
1.182 + /* Internal methods */
1.183 + HB_INTERNAL bool enlarge (unsigned int size);
1.184 +
1.185 + inline bool ensure (unsigned int size)
1.186 + { return likely (!size || size < allocated) ? true : enlarge (size); }
1.187 +
1.188 + HB_INTERNAL bool make_room_for (unsigned int num_in, unsigned int num_out);
1.189 + HB_INTERNAL bool shift_forward (unsigned int count);
1.190 +
1.191 + typedef long scratch_buffer_t;
1.192 + HB_INTERNAL scratch_buffer_t *get_scratch_buffer (unsigned int *size);
1.193 +
1.194 + inline void clear_context (unsigned int side) { context_len[side] = 0; }
1.195 +};
1.196 +
1.197 +
1.198 +#define HB_BUFFER_XALLOCATE_VAR(b, func, var, owner) \
1.199 + b->func (offsetof (hb_glyph_info_t, var) - offsetof(hb_glyph_info_t, var1), \
1.200 + sizeof (b->info[0].var), owner)
1.201 +#define HB_BUFFER_ALLOCATE_VAR(b, var) \
1.202 + HB_BUFFER_XALLOCATE_VAR (b, allocate_var, var (), #var)
1.203 +#define HB_BUFFER_DEALLOCATE_VAR(b, var) \
1.204 + HB_BUFFER_XALLOCATE_VAR (b, deallocate_var, var (), #var)
1.205 +#define HB_BUFFER_ASSERT_VAR(b, var) \
1.206 + HB_BUFFER_XALLOCATE_VAR (b, assert_var, var (), #var)
1.207 +
1.208 +
1.209 +#endif /* HB_BUFFER_PRIVATE_HH */
