hb-buffer-private.hh

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Author : Behdad Esfahbod
Date : 2014-08-11 18:40:01
Hash : b5fbc3b8
Message : API: Do not clear buffer-flags in hb_buffer_clear_contents() After 763e5466c0a03a7c27020e1e2598e488612529a7, one doesn't need to set flags for different pieces of text. The flags now are something the client sets up once, depending on how it actually uses the buffer. As such, don't clear it in clear_contents(). Tests updated.
src/hb-buffer-private.hh
/*
 * 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"


ASSERT_STATIC (sizeof (hb_glyph_info_t) == 20);
ASSERT_STATIC (sizeof (hb_glyph_info_t) == sizeof (hb_glyph_position_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_codepoint_t replacement; /* U+FFFD or something else. */

  /* Buffer contents */
  hb_buffer_content_type_t content_type;
  hb_segment_properties_t props; /* Script, language, direction */

  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;

  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 - 1]; }
  inline hb_glyph_info_t prev (void) const { return info[out_len - 1]; }

  inline bool has_separate_output (void) const { return info != out_info; }

  unsigned int serial;

  /* These reflect current allocations of the bytes in glyph_info_t's var1 and var2. */
  uint8_t allocated_var_bytes[8];
  const char *allocated_var_owner[8];

  /* 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];


  /* Methods */

  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 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 assert_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,
			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);

  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 || 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; }
};


#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)
#define HB_BUFFER_ASSERT_VAR(b, var) \
	HB_BUFFER_XALLOCATE_VAR (b, assert_var, var (), #var)


#endif /* HB_BUFFER_PRIVATE_HH */
kc3-lang/harfbuzz/src/hb-buffer-private.hh

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kc3-lang/harfbuzz /src/hb-buffer-private.hh
