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-/*
- * 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,
-
- /* 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-flallback, 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 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;
-
- 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 &info, unsigned int cluster, unsigned int mask = 0)
- {
- if (info.cluster != cluster)
- {
- if (mask & HB_GLYPH_FLAG_UNSAFE_TO_BREAK)
- info.mask |= HB_GLYPH_FLAG_UNSAFE_TO_BREAK;
- else
- info.mask &= ~HB_GLYPH_FLAG_UNSAFE_TO_BREAK;
- }
- info.cluster = cluster;
- }
-
- inline int
- _unsafe_to_break_find_min_cluster (const hb_glyph_info_t *info,
- unsigned int start, unsigned int end,
- unsigned int cluster) const
- {
- for (unsigned int i = start; i < end; i++)
- cluster = MIN<unsigned int> (cluster, info[i].cluster);
- return cluster;
- }
- inline void
- _unsafe_to_break_set_mask (hb_glyph_info_t *info,
- unsigned int start, unsigned int end,
- unsigned int cluster)
- {
- for (unsigned int i = start; i < end; i++)
- if (cluster != info[i].cluster)
- {
- scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_UNSAFE_TO_BREAK;
- info[i].mask |= HB_GLYPH_FLAG_UNSAFE_TO_BREAK;
- }
- }
-
- inline void
- unsafe_to_break_all (void)
- {
- for (unsigned int i = 0; i < len; i++)
- info[i].mask |= HB_GLYPH_FLAG_UNSAFE_TO_BREAK;
- }
- 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 */
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