255 lines
8.9 KiB
C++
255 lines
8.9 KiB
C++
/*
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* Copyright © 1998-2004 David Turner and Werner Lemberg
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* Copyright © 2004,2007,2009,2010 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_BUFFER_PRIVATE_HH
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#define HB_BUFFER_PRIVATE_HH
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#include "hb-private.hh"
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#include "hb-object-private.hh"
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#include "hb-unicode-private.hh"
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#ifndef HB_BUFFER_MAX_EXPANSION_FACTOR
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#define HB_BUFFER_MAX_EXPANSION_FACTOR 32
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#endif
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#ifndef HB_BUFFER_MAX_LEN_MIN
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#define HB_BUFFER_MAX_LEN_MIN 8192
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#endif
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#ifndef HB_BUFFER_MAX_LEN_DEFAULT
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#define HB_BUFFER_MAX_LEN_DEFAULT 0x3FFFFFFF /* Shaping more than a billion chars? Let us know! */
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#endif
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ASSERT_STATIC (sizeof (hb_glyph_info_t) == 20);
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ASSERT_STATIC (sizeof (hb_glyph_info_t) == sizeof (hb_glyph_position_t));
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HB_MARK_AS_FLAG_T (hb_buffer_flags_t);
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HB_MARK_AS_FLAG_T (hb_buffer_serialize_flags_t);
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enum hb_buffer_scratch_flags_t {
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HB_BUFFER_SCRATCH_FLAG_DEFAULT = 0x00000000u,
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HB_BUFFER_SCRATCH_FLAG_HAS_NON_ASCII = 0x00000001u,
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HB_BUFFER_SCRATCH_FLAG_HAS_DEFAULT_IGNORABLES = 0x00000002u,
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HB_BUFFER_SCRATCH_FLAG_HAS_SPACE_FALLBACK = 0x00000004u,
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HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_CURSIVE = 0x00000008u,
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HB_BUFFER_SCRATCH_FLAG_HAS_GPOS_ATTACHMENT = 0x00000010u,
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/* Reserved for complex shapers' internal use. */
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HB_BUFFER_SCRATCH_FLAG_COMPLEX0 = 0x01000000u,
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HB_BUFFER_SCRATCH_FLAG_COMPLEX1 = 0x02000000u,
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HB_BUFFER_SCRATCH_FLAG_COMPLEX2 = 0x04000000u,
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HB_BUFFER_SCRATCH_FLAG_COMPLEX3 = 0x08000000u,
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};
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HB_MARK_AS_FLAG_T (hb_buffer_scratch_flags_t);
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/*
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* hb_buffer_t
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*/
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struct hb_buffer_t {
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hb_object_header_t header;
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ASSERT_POD ();
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/* Information about how the text in the buffer should be treated */
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hb_unicode_funcs_t *unicode; /* Unicode functions */
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hb_buffer_flags_t flags; /* BOT / EOT / etc. */
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hb_buffer_cluster_level_t cluster_level;
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hb_codepoint_t replacement; /* U+FFFD or something else. */
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hb_buffer_scratch_flags_t scratch_flags; /* Have space-flallback, etc. */
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unsigned int max_len; /* Maximum allowed len. */
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/* Buffer contents */
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hb_buffer_content_type_t content_type;
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hb_segment_properties_t props; /* Script, language, direction */
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bool in_error; /* Allocation failed */
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bool have_output; /* Whether we have an output buffer going on */
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bool have_positions; /* Whether we have positions */
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unsigned int idx; /* Cursor into ->info and ->pos arrays */
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unsigned int len; /* Length of ->info and ->pos arrays */
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unsigned int out_len; /* Length of ->out array if have_output */
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unsigned int allocated; /* Length of allocated arrays */
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hb_glyph_info_t *info;
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hb_glyph_info_t *out_info;
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hb_glyph_position_t *pos;
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inline hb_glyph_info_t &cur (unsigned int i = 0) { return info[idx + i]; }
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inline hb_glyph_info_t cur (unsigned int i = 0) const { return info[idx + i]; }
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inline hb_glyph_position_t &cur_pos (unsigned int i = 0) { return pos[idx + i]; }
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inline hb_glyph_position_t cur_pos (unsigned int i = 0) const { return pos[idx + i]; }
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inline hb_glyph_info_t &prev (void) { return out_info[out_len ? out_len - 1 : 0]; }
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inline hb_glyph_info_t prev (void) const { return out_info[out_len ? out_len - 1 : 0]; }
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inline bool has_separate_output (void) const { return info != out_info; }
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unsigned int serial;
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/* These reflect current allocations of the bytes in glyph_info_t's var1 and var2. */
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uint8_t allocated_var_bytes[8];
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const char *allocated_var_owner[8];
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/* Text before / after the main buffer contents.
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* Always in Unicode, and ordered outward.
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* Index 0 is for "pre-context", 1 for "post-context". */
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static const unsigned int CONTEXT_LENGTH = 5;
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hb_codepoint_t context[2][CONTEXT_LENGTH];
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unsigned int context_len[2];
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/* Methods */
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HB_INTERNAL void reset (void);
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HB_INTERNAL void clear (void);
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inline unsigned int backtrack_len (void) const
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{ return have_output? out_len : idx; }
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inline unsigned int lookahead_len (void) const
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{ return len - idx; }
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inline unsigned int next_serial (void) { return serial++; }
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HB_INTERNAL void allocate_var (unsigned int byte_i, unsigned int count, const char *owner);
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HB_INTERNAL void deallocate_var (unsigned int byte_i, unsigned int count, const char *owner);
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HB_INTERNAL void assert_var (unsigned int byte_i, unsigned int count, const char *owner);
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HB_INTERNAL void deallocate_var_all (void);
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HB_INTERNAL void add (hb_codepoint_t codepoint,
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unsigned int cluster);
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HB_INTERNAL void add_info (const hb_glyph_info_t &glyph_info);
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HB_INTERNAL void reverse_range (unsigned int start, unsigned int end);
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HB_INTERNAL void reverse (void);
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HB_INTERNAL void reverse_clusters (void);
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HB_INTERNAL void guess_segment_properties (void);
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HB_INTERNAL void swap_buffers (void);
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HB_INTERNAL void remove_output (void);
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HB_INTERNAL void clear_output (void);
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HB_INTERNAL void clear_positions (void);
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HB_INTERNAL void replace_glyphs (unsigned int num_in,
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unsigned int num_out,
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const hb_codepoint_t *glyph_data);
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HB_INTERNAL void replace_glyph (hb_codepoint_t glyph_index);
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/* Makes a copy of the glyph at idx to output and replace glyph_index */
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HB_INTERNAL void output_glyph (hb_codepoint_t glyph_index);
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HB_INTERNAL void output_info (const hb_glyph_info_t &glyph_info);
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/* Copies glyph at idx to output but doesn't advance idx */
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HB_INTERNAL void copy_glyph (void);
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HB_INTERNAL bool move_to (unsigned int i); /* i is output-buffer index. */
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/* Copies glyph at idx to output and advance idx.
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* If there's no output, just advance idx. */
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inline void
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next_glyph (void)
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{
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if (have_output)
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{
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if (unlikely (out_info != info || out_len != idx)) {
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if (unlikely (!make_room_for (1, 1)))
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{
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idx++; // So we don't hang indefinitely...
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return;
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}
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out_info[out_len] = info[idx];
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}
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out_len++;
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}
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idx++;
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}
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/* Advance idx without copying to output. */
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inline void skip_glyph (void) { idx++; }
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inline void reset_masks (hb_mask_t mask)
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{
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for (unsigned int j = 0; j < len; j++)
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info[j].mask = mask;
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}
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inline void add_masks (hb_mask_t mask)
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{
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for (unsigned int j = 0; j < len; j++)
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info[j].mask |= mask;
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}
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HB_INTERNAL void set_masks (hb_mask_t value,
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hb_mask_t mask,
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unsigned int cluster_start,
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unsigned int cluster_end);
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HB_INTERNAL void merge_clusters (unsigned int start,
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unsigned int end)
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{
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if (end - start < 2)
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return;
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merge_clusters_impl (start, end);
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}
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HB_INTERNAL void merge_clusters_impl (unsigned int start,
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unsigned int end);
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HB_INTERNAL void merge_out_clusters (unsigned int start,
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unsigned int end);
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/* Merge clusters for deleting current glyph, and skip it. */
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HB_INTERNAL void delete_glyph (void);
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/* Internal methods */
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HB_INTERNAL bool enlarge (unsigned int size);
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inline bool ensure (unsigned int size)
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{ return likely (!size || size < allocated) ? true : enlarge (size); }
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inline bool ensure_inplace (unsigned int size)
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{ return likely (!size || size < allocated); }
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HB_INTERNAL bool make_room_for (unsigned int num_in, unsigned int num_out);
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HB_INTERNAL bool shift_forward (unsigned int count);
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typedef long scratch_buffer_t;
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HB_INTERNAL scratch_buffer_t *get_scratch_buffer (unsigned int *size);
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inline void clear_context (unsigned int side) { context_len[side] = 0; }
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HB_INTERNAL void sort (unsigned int start, unsigned int end, int(*compar)(const hb_glyph_info_t *, const hb_glyph_info_t *));
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};
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#define HB_BUFFER_XALLOCATE_VAR(b, func, var, owner) \
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b->func (offsetof (hb_glyph_info_t, var) - offsetof(hb_glyph_info_t, var1), \
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sizeof (b->info[0].var), owner)
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#define HB_BUFFER_ALLOCATE_VAR(b, var) \
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HB_BUFFER_XALLOCATE_VAR (b, allocate_var, var (), #var)
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#define HB_BUFFER_DEALLOCATE_VAR(b, var) \
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HB_BUFFER_XALLOCATE_VAR (b, deallocate_var, var (), #var)
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#define HB_BUFFER_ASSERT_VAR(b, var) \
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HB_BUFFER_XALLOCATE_VAR (b, assert_var, var (), #var)
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#endif /* HB_BUFFER_PRIVATE_HH */
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