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comparison: gfx/harfbuzz/src/hb-buffer-private.hh
gfx/harfbuzz/src/hb-buffer-private.hh
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| 1 /* | |
| 2 * Copyright © 1998-2004 David Turner and Werner Lemberg | |
| 3 * Copyright © 2004,2007,2009,2010 Red Hat, Inc. | |
| 4 * Copyright © 2011,2012 Google, Inc. | |
| 5 * | |
| 6 * This is part of HarfBuzz, a text shaping library. | |
| 7 * | |
| 8 * Permission is hereby granted, without written agreement and without | |
| 9 * license or royalty fees, to use, copy, modify, and distribute this | |
| 10 * software and its documentation for any purpose, provided that the | |
| 11 * above copyright notice and the following two paragraphs appear in | |
| 12 * all copies of this software. | |
| 13 * | |
| 14 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR | |
| 15 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES | |
| 16 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN | |
| 17 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH | |
| 18 * DAMAGE. | |
| 19 * | |
| 20 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, | |
| 21 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND | |
| 22 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS | |
| 23 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO | |
| 24 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. | |
| 25 * | |
| 26 * Red Hat Author(s): Owen Taylor, Behdad Esfahbod | |
| 27 * Google Author(s): Behdad Esfahbod | |
| 28 */ | |
| 29 | |
| 30 #ifndef HB_BUFFER_PRIVATE_HH | |
| 31 #define HB_BUFFER_PRIVATE_HH | |
| 32 | |
| 33 #include "hb-private.hh" | |
| 34 #include "hb-object-private.hh" | |
| 35 #include "hb-unicode-private.hh" | |
| 36 | |
| 37 | |
| 38 ASSERT_STATIC (sizeof (hb_glyph_info_t) == 20); | |
| 39 ASSERT_STATIC (sizeof (hb_glyph_info_t) == sizeof (hb_glyph_position_t)); | |
| 40 | |
| 41 | |
| 42 /* | |
| 43 * hb_buffer_t | |
| 44 */ | |
| 45 | |
| 46 struct hb_buffer_t { | |
| 47 hb_object_header_t header; | |
| 48 ASSERT_POD (); | |
| 49 | |
| 50 /* Information about how the text in the buffer should be treated */ | |
| 51 | |
| 52 hb_unicode_funcs_t *unicode; /* Unicode functions */ | |
| 53 hb_segment_properties_t props; /* Script, language, direction */ | |
| 54 hb_buffer_flags_t flags; /* BOT / EOT / etc. */ | |
| 55 | |
| 56 /* Buffer contents */ | |
| 57 | |
| 58 hb_buffer_content_type_t content_type; | |
| 59 | |
| 60 bool in_error; /* Allocation failed */ | |
| 61 bool have_output; /* Whether we have an output buffer going on */ | |
| 62 bool have_positions; /* Whether we have positions */ | |
| 63 | |
| 64 unsigned int idx; /* Cursor into ->info and ->pos arrays */ | |
| 65 unsigned int len; /* Length of ->info and ->pos arrays */ | |
| 66 unsigned int out_len; /* Length of ->out array if have_output */ | |
| 67 | |
| 68 unsigned int allocated; /* Length of allocated arrays */ | |
| 69 hb_glyph_info_t *info; | |
| 70 hb_glyph_info_t *out_info; | |
| 71 hb_glyph_position_t *pos; | |
| 72 | |
| 73 inline hb_glyph_info_t &cur (unsigned int i = 0) { return info[idx + i]; } | |
| 74 inline hb_glyph_info_t cur (unsigned int i = 0) const { return info[idx + i]; } | |
| 75 | |
| 76 inline hb_glyph_position_t &cur_pos (unsigned int i = 0) { return pos[idx + i]; } | |
| 77 inline hb_glyph_position_t cur_pos (unsigned int i = 0) const { return pos[idx + i]; } | |
| 78 | |
| 79 inline hb_glyph_info_t &prev (void) { return out_info[out_len - 1]; } | |
| 80 inline hb_glyph_info_t prev (void) const { return info[out_len - 1]; } | |
| 81 | |
| 82 inline bool has_separate_output (void) const { return info != out_info; } | |
| 83 | |
| 84 unsigned int serial; | |
| 85 | |
| 86 /* These reflect current allocations of the bytes in glyph_info_t's var1 and var2. */ | |
| 87 uint8_t allocated_var_bytes[8]; | |
| 88 const char *allocated_var_owner[8]; | |
| 89 | |
| 90 /* Text before / after the main buffer contents. | |
| 91 * Always in Unicode, and ordered outward. | |
| 92 * Index 0 is for "pre-context", 1 for "post-context". */ | |
| 93 static const unsigned int CONTEXT_LENGTH = 5; | |
| 94 hb_codepoint_t context[2][CONTEXT_LENGTH]; | |
| 95 unsigned int context_len[2]; | |
| 96 | |
| 97 | |
| 98 /* Methods */ | |
| 99 | |
| 100 HB_INTERNAL void reset (void); | |
| 101 HB_INTERNAL void clear (void); | |
| 102 | |
| 103 inline unsigned int backtrack_len (void) const | |
| 104 { return have_output? out_len : idx; } | |
| 105 inline unsigned int lookahead_len (void) const | |
| 106 { return len - idx; } | |
| 107 inline unsigned int next_serial (void) { return serial++; } | |
| 108 | |
| 109 HB_INTERNAL void allocate_var (unsigned int byte_i, unsigned int count, const char *owner); | |
| 110 HB_INTERNAL void deallocate_var (unsigned int byte_i, unsigned int count, const char *owner); | |
| 111 HB_INTERNAL void assert_var (unsigned int byte_i, unsigned int count, const char *owner); | |
| 112 HB_INTERNAL void deallocate_var_all (void); | |
| 113 | |
| 114 HB_INTERNAL void add (hb_codepoint_t codepoint, | |
| 115 unsigned int cluster); | |
| 116 HB_INTERNAL void add_info (const hb_glyph_info_t &glyph_info); | |
| 117 | |
| 118 HB_INTERNAL void reverse_range (unsigned int start, unsigned int end); | |
| 119 HB_INTERNAL void reverse (void); | |
| 120 HB_INTERNAL void reverse_clusters (void); | |
| 121 HB_INTERNAL void guess_segment_properties (void); | |
| 122 | |
| 123 HB_INTERNAL void swap_buffers (void); | |
| 124 HB_INTERNAL void remove_output (void); | |
| 125 HB_INTERNAL void clear_output (void); | |
| 126 HB_INTERNAL void clear_positions (void); | |
| 127 | |
| 128 HB_INTERNAL void replace_glyphs (unsigned int num_in, | |
| 129 unsigned int num_out, | |
| 130 const hb_codepoint_t *glyph_data); | |
| 131 | |
| 132 HB_INTERNAL void replace_glyph (hb_codepoint_t glyph_index); | |
| 133 /* Makes a copy of the glyph at idx to output and replace glyph_index */ | |
| 134 HB_INTERNAL void output_glyph (hb_codepoint_t glyph_index); | |
| 135 HB_INTERNAL void output_info (const hb_glyph_info_t &glyph_info); | |
| 136 /* Copies glyph at idx to output but doesn't advance idx */ | |
| 137 HB_INTERNAL void copy_glyph (void); | |
| 138 HB_INTERNAL bool move_to (unsigned int i); /* i is output-buffer index. */ | |
| 139 /* Copies glyph at idx to output and advance idx. | |
| 140 * If there's no output, just advance idx. */ | |
| 141 inline void | |
| 142 next_glyph (void) | |
| 143 { | |
| 144 if (have_output) | |
| 145 { | |
| 146 if (unlikely (out_info != info || out_len != idx)) { | |
| 147 if (unlikely (!make_room_for (1, 1))) return; | |
| 148 out_info[out_len] = info[idx]; | |
| 149 } | |
| 150 out_len++; | |
| 151 } | |
| 152 | |
| 153 idx++; | |
| 154 } | |
| 155 | |
| 156 /* Advance idx without copying to output. */ | |
| 157 inline void skip_glyph (void) { idx++; } | |
| 158 | |
| 159 inline void reset_masks (hb_mask_t mask) | |
| 160 { | |
| 161 for (unsigned int j = 0; j < len; j++) | |
| 162 info[j].mask = mask; | |
| 163 } | |
| 164 inline void add_masks (hb_mask_t mask) | |
| 165 { | |
| 166 for (unsigned int j = 0; j < len; j++) | |
| 167 info[j].mask |= mask; | |
| 168 } | |
| 169 HB_INTERNAL void set_masks (hb_mask_t value, | |
| 170 hb_mask_t mask, | |
| 171 unsigned int cluster_start, | |
| 172 unsigned int cluster_end); | |
| 173 | |
| 174 HB_INTERNAL void merge_clusters (unsigned int start, | |
| 175 unsigned int end); | |
| 176 HB_INTERNAL void merge_out_clusters (unsigned int start, | |
| 177 unsigned int end); | |
| 178 | |
| 179 /* Internal methods */ | |
| 180 HB_INTERNAL bool enlarge (unsigned int size); | |
| 181 | |
| 182 inline bool ensure (unsigned int size) | |
| 183 { return likely (!size || size < allocated) ? true : enlarge (size); } | |
| 184 | |
| 185 HB_INTERNAL bool make_room_for (unsigned int num_in, unsigned int num_out); | |
| 186 HB_INTERNAL bool shift_forward (unsigned int count); | |
| 187 | |
| 188 typedef long scratch_buffer_t; | |
| 189 HB_INTERNAL scratch_buffer_t *get_scratch_buffer (unsigned int *size); | |
| 190 | |
| 191 inline void clear_context (unsigned int side) { context_len[side] = 0; } | |
| 192 }; | |
| 193 | |
| 194 | |
| 195 #define HB_BUFFER_XALLOCATE_VAR(b, func, var, owner) \ | |
| 196 b->func (offsetof (hb_glyph_info_t, var) - offsetof(hb_glyph_info_t, var1), \ | |
| 197 sizeof (b->info[0].var), owner) | |
| 198 #define HB_BUFFER_ALLOCATE_VAR(b, var) \ | |
| 199 HB_BUFFER_XALLOCATE_VAR (b, allocate_var, var (), #var) | |
| 200 #define HB_BUFFER_DEALLOCATE_VAR(b, var) \ | |
| 201 HB_BUFFER_XALLOCATE_VAR (b, deallocate_var, var (), #var) | |
| 202 #define HB_BUFFER_ASSERT_VAR(b, var) \ | |
| 203 HB_BUFFER_XALLOCATE_VAR (b, assert_var, var (), #var) | |
| 204 | |
| 205 | |
| 206 #endif /* HB_BUFFER_PRIVATE_HH */ |
