162 lines
5.4 KiB
C++
162 lines
5.4 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 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-buffer.h"
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#include "hb-object-private.hh"
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#include "hb-unicode-private.hh"
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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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typedef struct _hb_segment_properties_t {
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hb_direction_t direction;
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hb_script_t script;
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hb_language_t language;
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} hb_segment_properties_t;
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struct _hb_buffer_t {
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hb_object_header_t header;
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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_segment_properties_t props; /* Script, language, direction */
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/* Buffer contents */
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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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unsigned int serial;
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uint8_t allocated_var_bytes[8];
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const char *allocated_var_owner[8];
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/* Methods */
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HB_INTERNAL void reset (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 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 deallocate_var_all (void);
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HB_INTERNAL void add (hb_codepoint_t codepoint,
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hb_mask_t mask,
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unsigned int cluster);
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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_properties (void);
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HB_INTERNAL void swap_buffers (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_be16 (unsigned int num_in,
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unsigned int num_out,
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const uint16_t *glyph_data_be);
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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 uint16_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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/* 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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/* 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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HB_INTERNAL void next_glyph (void);
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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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HB_INTERNAL void merge_out_clusters (unsigned int start,
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unsigned int end);
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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 <= allocated) ? TRUE : enlarge (size); }
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HB_INTERNAL bool make_room_for (unsigned int num_in, unsigned int num_out);
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HB_INTERNAL void *get_scratch_buffer (unsigned int *size);
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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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#endif /* HB_BUFFER_PRIVATE_HH */
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