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Diffstat (limited to 'src/hb-buffer-private.hh')
-rw-r--r-- | src/hb-buffer-private.hh | 388 |
1 files changed, 0 insertions, 388 deletions
diff --git a/src/hb-buffer-private.hh b/src/hb-buffer-private.hh deleted file mode 100644 index dd6f1dc..0000000 --- a/src/hb-buffer-private.hh +++ /dev/null @@ -1,388 +0,0 @@ -/* - * Copyright © 1998-2004 David Turner and Werner Lemberg - * Copyright © 2004,2007,2009,2010 Red Hat, Inc. - * Copyright © 2011,2012 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-object-private.hh" -#include "hb-unicode-private.hh" - - -#ifndef HB_BUFFER_MAX_LEN_FACTOR -#define HB_BUFFER_MAX_LEN_FACTOR 32 -#endif -#ifndef HB_BUFFER_MAX_LEN_MIN -#define HB_BUFFER_MAX_LEN_MIN 8192 -#endif -#ifndef HB_BUFFER_MAX_LEN_DEFAULT -#define HB_BUFFER_MAX_LEN_DEFAULT 0x3FFFFFFF /* Shaping more than a billion chars? Let us know! */ -#endif - -#ifndef HB_BUFFER_MAX_OPS_FACTOR -#define HB_BUFFER_MAX_OPS_FACTOR 64 -#endif -#ifndef HB_BUFFER_MAX_OPS_MIN -#define HB_BUFFER_MAX_OPS_MIN 1024 -#endif -#ifndef HB_BUFFER_MAX_OPS_DEFAULT -#define HB_BUFFER_MAX_OPS_DEFAULT 0x1FFFFFFF /* Shaping more than a billion operations? Let us know! */ -#endif - -static_assert ((sizeof (hb_glyph_info_t) == 20), ""); -static_assert ((sizeof (hb_glyph_info_t) == sizeof (hb_glyph_position_t)), ""); - -HB_MARK_AS_FLAG_T (hb_buffer_flags_t); -HB_MARK_AS_FLAG_T (hb_buffer_serialize_flags_t); -HB_MARK_AS_FLAG_T (hb_buffer_diff_flags_t); - -enum hb_buffer_scratch_flags_t { - HB_BUFFER_SCRATCH_FLAG_DEFAULT = 0x00000000u, - HB_BUFFER_SCRATCH_FLAG_HAS_NON_ASCII = 0x00000001u, - HB_BUFFER_SCRATCH_FLAG_HAS_DEFAULT_IGNORABLES = 0x00000002u, - HB_BUFFER_SCRATCH_FLAG_HAS_SPACE_FALLBACK = 0x00000004u, - HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT = 0x00000008u, - HB_BUFFER_SCRATCH_FLAG_HAS_UNSAFE_TO_BREAK = 0x00000010u, - HB_BUFFER_SCRATCH_FLAG_HAS_CGJ = 0x00000020u, - - /* Reserved for complex shapers' internal use. */ - HB_BUFFER_SCRATCH_FLAG_COMPLEX0 = 0x01000000u, - HB_BUFFER_SCRATCH_FLAG_COMPLEX1 = 0x02000000u, - HB_BUFFER_SCRATCH_FLAG_COMPLEX2 = 0x04000000u, - HB_BUFFER_SCRATCH_FLAG_COMPLEX3 = 0x08000000u, -}; -HB_MARK_AS_FLAG_T (hb_buffer_scratch_flags_t); - - -/* - * hb_buffer_t - */ - -struct hb_buffer_t { - hb_object_header_t header; - ASSERT_POD (); - - /* Information about how the text in the buffer should be treated */ - hb_unicode_funcs_t *unicode; /* Unicode functions */ - hb_buffer_flags_t flags; /* BOT / EOT / etc. */ - hb_buffer_cluster_level_t cluster_level; - hb_codepoint_t replacement; /* U+FFFD or something else. */ - hb_buffer_scratch_flags_t scratch_flags; /* Have space-fallback, etc. */ - unsigned int max_len; /* Maximum allowed len. */ - int max_ops; /* Maximum allowed operations. */ - - /* Buffer contents */ - hb_buffer_content_type_t content_type; - hb_segment_properties_t props; /* Script, language, direction */ - - bool successful; /* Allocations successful */ - 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; - - /* Text before / after the main buffer contents. - * Always in Unicode, and ordered outward. - * Index 0 is for "pre-context", 1 for "post-context". */ - static const unsigned int CONTEXT_LENGTH = 5; - hb_codepoint_t context[2][CONTEXT_LENGTH]; - unsigned int context_len[2]; - - /* Debugging API */ - hb_buffer_message_func_t message_func; - void *message_data; - hb_destroy_func_t message_destroy; - - /* Internal debugging. */ - /* The bits here reflect current allocations of the bytes in glyph_info_t's var1 and var2. */ -#ifndef HB_NDEBUG - uint8_t allocated_var_bits; -#endif - - - /* Methods */ - - inline void allocate_var (unsigned int start, unsigned int count) - { -#ifndef HB_NDEBUG - unsigned int end = start + count; - assert (end <= 8); - unsigned int bits = (1u<<end) - (1u<<start); - assert (0 == (allocated_var_bits & bits)); - allocated_var_bits |= bits; -#endif - } - inline void deallocate_var (unsigned int start, unsigned int count) - { -#ifndef HB_NDEBUG - unsigned int end = start + count; - assert (end <= 8); - unsigned int bits = (1u<<end) - (1u<<start); - assert (bits == (allocated_var_bits & bits)); - allocated_var_bits &= ~bits; -#endif - } - inline void assert_var (unsigned int start, unsigned int count) - { -#ifndef HB_NDEBUG - unsigned int end = start + count; - assert (end <= 8); - unsigned int bits = (1u<<end) - (1u<<start); - assert (bits == (allocated_var_bits & bits)); -#endif - } - inline void deallocate_var_all (void) - { -#ifndef HB_NDEBUG - allocated_var_bits = 0; -#endif - } - - inline hb_glyph_info_t &cur (unsigned int i = 0) { return info[idx + i]; } - inline hb_glyph_info_t cur (unsigned int i = 0) const { return info[idx + i]; } - - inline hb_glyph_position_t &cur_pos (unsigned int i = 0) { return pos[idx + i]; } - inline hb_glyph_position_t cur_pos (unsigned int i = 0) const { return pos[idx + i]; } - - inline hb_glyph_info_t &prev (void) { return out_info[out_len ? out_len - 1 : 0]; } - inline hb_glyph_info_t prev (void) const { return out_info[out_len ? out_len - 1 : 0]; } - - inline bool has_separate_output (void) const { return info != out_info; } - - - HB_INTERNAL void reset (void); - HB_INTERNAL void clear (void); - - inline unsigned int backtrack_len (void) const - { return have_output? out_len : idx; } - inline unsigned int lookahead_len (void) const - { return len - idx; } - inline unsigned int next_serial (void) { return serial++; } - - HB_INTERNAL void add (hb_codepoint_t codepoint, - unsigned int cluster); - HB_INTERNAL void add_info (const hb_glyph_info_t &glyph_info); - - 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_segment_properties (void); - - HB_INTERNAL void swap_buffers (void); - HB_INTERNAL void remove_output (void); - HB_INTERNAL void clear_output (void); - HB_INTERNAL void clear_positions (void); - - 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); - HB_INTERNAL void output_info (const hb_glyph_info_t &glyph_info); - /* Copies glyph at idx to output but doesn't advance idx */ - HB_INTERNAL void copy_glyph (void); - HB_INTERNAL bool move_to (unsigned int i); /* i is output-buffer index. */ - /* Copies glyph at idx to output and advance idx. - * If there's no output, just advance idx. */ - inline void - next_glyph (void) - { - if (have_output) - { - if (unlikely (out_info != info || out_len != idx)) { - if (unlikely (!make_room_for (1, 1))) return; - out_info[out_len] = info[idx]; - } - out_len++; - } - - idx++; - } - - /* 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); - - inline void merge_clusters (unsigned int start, unsigned int end) - { - if (end - start < 2) - return; - merge_clusters_impl (start, end); - } - HB_INTERNAL void merge_clusters_impl (unsigned int start, unsigned int end); - HB_INTERNAL void merge_out_clusters (unsigned int start, unsigned int end); - /* Merge clusters for deleting current glyph, and skip it. */ - HB_INTERNAL void delete_glyph (void); - - inline void unsafe_to_break (unsigned int start, - unsigned int end) - { - if (end - start < 2) - return; - unsafe_to_break_impl (start, end); - } - HB_INTERNAL void unsafe_to_break_impl (unsigned int start, unsigned int end); - HB_INTERNAL void unsafe_to_break_from_outbuffer (unsigned int start, unsigned int end); - - - /* Internal methods */ - HB_INTERNAL bool enlarge (unsigned int size); - - inline bool ensure (unsigned int size) - { return likely (!size || size < allocated) ? true : enlarge (size); } - - inline bool ensure_inplace (unsigned int size) - { return likely (!size || size < allocated); } - - HB_INTERNAL bool make_room_for (unsigned int num_in, unsigned int num_out); - HB_INTERNAL bool shift_forward (unsigned int count); - - typedef long scratch_buffer_t; - HB_INTERNAL scratch_buffer_t *get_scratch_buffer (unsigned int *size); - - inline void clear_context (unsigned int side) { context_len[side] = 0; } - - HB_INTERNAL void sort (unsigned int start, unsigned int end, int(*compar)(const hb_glyph_info_t *, const hb_glyph_info_t *)); - - inline bool messaging (void) { return unlikely (message_func); } - inline bool message (hb_font_t *font, const char *fmt, ...) HB_PRINTF_FUNC(3, 4) - { - if (!messaging ()) - return true; - va_list ap; - va_start (ap, fmt); - bool ret = message_impl (font, fmt, ap); - va_end (ap); - return ret; - } - HB_INTERNAL bool message_impl (hb_font_t *font, const char *fmt, va_list ap) HB_PRINTF_FUNC(3, 0); - - static inline void - set_cluster (hb_glyph_info_t &inf, unsigned int cluster, unsigned int mask = 0) - { - if (inf.cluster != cluster) - { - if (mask & HB_GLYPH_FLAG_UNSAFE_TO_BREAK) - inf.mask |= HB_GLYPH_FLAG_UNSAFE_TO_BREAK; - else - inf.mask &= ~HB_GLYPH_FLAG_UNSAFE_TO_BREAK; - } - inf.cluster = cluster; - } - - inline int - _unsafe_to_break_find_min_cluster (const hb_glyph_info_t *infos, - unsigned int start, unsigned int end, - unsigned int cluster) const - { - for (unsigned int i = start; i < end; i++) - cluster = MIN<unsigned int> (cluster, infos[i].cluster); - return cluster; - } - inline void - _unsafe_to_break_set_mask (hb_glyph_info_t *infos, - unsigned int start, unsigned int end, - unsigned int cluster) - { - for (unsigned int i = start; i < end; i++) - if (cluster != infos[i].cluster) - { - scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_UNSAFE_TO_BREAK; - infos[i].mask |= HB_GLYPH_FLAG_UNSAFE_TO_BREAK; - } - } - - inline void - unsafe_to_break_all (void) - { - unsafe_to_break_impl (0, len); - } - inline void - safe_to_break_all (void) - { - for (unsigned int i = 0; i < len; i++) - info[i].mask &= ~HB_GLYPH_FLAG_UNSAFE_TO_BREAK; - } -}; - - -/* Loop over clusters. Duplicated in foreach_syllable(). */ -#define foreach_cluster(buffer, start, end) \ - for (unsigned int \ - _count = buffer->len, \ - start = 0, end = _count ? _next_cluster (buffer, 0) : 0; \ - start < _count; \ - start = end, end = _next_cluster (buffer, start)) - -static inline unsigned int -_next_cluster (hb_buffer_t *buffer, unsigned int start) -{ - hb_glyph_info_t *info = buffer->info; - unsigned int count = buffer->len; - - unsigned int cluster = info[start].cluster; - while (++start < count && cluster == info[start].cluster) - ; - - return start; -} - - -#define HB_BUFFER_XALLOCATE_VAR(b, func, var) \ - b->func (offsetof (hb_glyph_info_t, var) - offsetof(hb_glyph_info_t, var1), \ - sizeof (b->info[0].var)) -#define HB_BUFFER_ALLOCATE_VAR(b, var) HB_BUFFER_XALLOCATE_VAR (b, allocate_var, var ()) -#define HB_BUFFER_DEALLOCATE_VAR(b, var) HB_BUFFER_XALLOCATE_VAR (b, deallocate_var, var ()) -#define HB_BUFFER_ASSERT_VAR(b, var) HB_BUFFER_XALLOCATE_VAR (b, assert_var, var ()) - - -#endif /* HB_BUFFER_PRIVATE_HH */ |