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Diffstat (limited to 'gfx/harfbuzz/src/hb-buffer-deserialize-text-glyphs.rl')
| -rw-r--r-- | gfx/harfbuzz/src/hb-buffer-deserialize-text-glyphs.rl | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-buffer-deserialize-text-glyphs.rl b/gfx/harfbuzz/src/hb-buffer-deserialize-text-glyphs.rl new file mode 100644 index 0000000000..21db14b568 --- /dev/null +++ b/gfx/harfbuzz/src/hb-buffer-deserialize-text-glyphs.rl @@ -0,0 +1,150 @@ +/* + * Copyright © 2013 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. + * + * Google Author(s): Behdad Esfahbod + */ + +#ifndef HB_BUFFER_DESERIALIZE_TEXT_GLYPHS_HH +#define HB_BUFFER_DESERIALIZE_TEXT_GLYPHS_HH + +#include "hb.hh" + +%%{ + +machine deserialize_text_glyphs; +alphtype unsigned char; +write data; + +action clear_item { + hb_memset (&info, 0, sizeof (info)); + hb_memset (&pos , 0, sizeof (pos )); +} + +action add_item { + buffer->add_info (info); + if (unlikely (!buffer->successful)) + return false; + buffer->pos[buffer->len - 1] = pos; + *end_ptr = p; +} + +action tok { + tok = p; +} + +action parse_glyph { + /* TODO Unescape delimiters. */ + if (!hb_font_glyph_from_string (font, + tok, p - tok, + &info.codepoint)) + return false; +} + +action parse_cluster { if (!parse_uint (tok, p, &info.cluster )) return false; } +action parse_x_offset { if (!parse_int (tok, p, &pos.x_offset )) return false; } +action parse_y_offset { if (!parse_int (tok, p, &pos.y_offset )) return false; } +action parse_x_advance { if (!parse_int (tok, p, &pos.x_advance)) return false; } +action parse_y_advance { if (!parse_int (tok, p, &pos.y_advance)) return false; } +action parse_glyph_flags{ if (!parse_uint (tok, p, &info.mask )) return false; } + +unum = '0' | [1-9] digit*; +num = '-'? unum; + +glyph_id = unum; +glyph_name = ([^\\\]=@+,#|] | '\\' [\\\]=@+,|]) *; + +glyph = (glyph_id | glyph_name) >tok %parse_glyph; +cluster = '=' (unum >tok %parse_cluster); +offsets = '@' (num >tok %parse_x_offset) ',' (num >tok %parse_y_offset ); +advances= '+' (num >tok %parse_x_advance) (',' (num >tok %parse_y_advance))?; +glyphflags= '#' (unum >tok %parse_glyph_flags); + +glyph_item = + ( + glyph + cluster? + offsets? + advances? + glyphflags? + ) + >clear_item + %add_item + ; + +glyphs = glyph_item (space* '|' space* glyph_item)* space*; + +main := space* glyphs; + +}%% + +static hb_bool_t +_hb_buffer_deserialize_text_glyphs (hb_buffer_t *buffer, + const char *buf, + unsigned int buf_len, + const char **end_ptr, + hb_font_t *font) +{ + const char *p = buf, *pe = buf + buf_len, *eof = pe, *orig_pe = pe; + + /* Ensure we have positions. */ + (void) hb_buffer_get_glyph_positions (buffer, nullptr); + + while (p < pe && ISSPACE (*p)) + p++; + if (p < pe && *p == (buffer->len ? '|' : '[')) + *end_ptr = ++p; + + const char *end = strchr ((char *) p, ']'); + if (end) + pe = eof = end; + else + { + end = strrchr ((char *) p, '|'); + if (end) + pe = eof = end; + else + pe = eof = p; + } + + const char *tok = nullptr; + int cs; + hb_glyph_info_t info = {0}; + hb_glyph_position_t pos = {0}; + %%{ + write init; + write exec; + }%% + + if (pe < orig_pe && *pe == ']') + { + pe++; + if (p == pe) + p++; + } + + *end_ptr = p; + + return p == pe; +} + +#endif /* HB_BUFFER_DESERIALIZE_TEXT_GLYPHS_HH */ |