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kc3-lang/harfbuzz/src/hb-ot-post-table.hh
Behdad Esfahbod
- src/hb-ot-post-table.hh
-
/* * Copyright © 2016 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_OT_POST_TABLE_HH #define HB_OT_POST_TABLE_HH #include "hb-open-type.hh" #include "hb-ot-var-mvar-table.hh" #define HB_STRING_ARRAY_NAME format1_names #define HB_STRING_ARRAY_LIST "hb-ot-post-macroman.hh" #include "hb-string-array.hh" #undef HB_STRING_ARRAY_LIST #undef HB_STRING_ARRAY_NAME /* * post -- PostScript * https://docs.microsoft.com/en-us/typography/opentype/spec/post */ #define HB_OT_TAG_post HB_TAG('p','o','s','t') namespace OT { struct postV2Tail { friend struct post; bool sanitize (hb_sanitize_context_t *c) const { TRACE_SANITIZE (this); return_trace (glyphNameIndex.sanitize (c)); } template<typename Iterator> bool serialize (hb_serialize_context_t *c, Iterator it, const void* _post) const; bool subset (hb_subset_context_t *c) const; protected: Array16Of<HBUINT16> glyphNameIndex; /* This is not an offset, but is the * ordinal number of the glyph in 'post' * string tables. */ /*UnsizedArrayOf<HBUINT8> namesX;*/ /* Glyph names with length bytes [variable] * (a Pascal string). */ public: DEFINE_SIZE_ARRAY (2, glyphNameIndex); }; struct post { static constexpr hb_tag_t tableTag = HB_OT_TAG_post; bool serialize (hb_serialize_context_t *c, bool glyph_names) const { TRACE_SERIALIZE (this); post *post_prime = c->allocate_min<post> (); if (unlikely (!post_prime)) return_trace (false); hb_memcpy (post_prime, this, post::min_size); if (!glyph_names) return_trace (c->check_assign (post_prime->version.major, 3, HB_SERIALIZE_ERROR_INT_OVERFLOW)); // Version 3 does not have any glyph names. return_trace (true); } bool subset (hb_subset_context_t *c) const { TRACE_SUBSET (this); auto *post_prime = c->serializer->start_embed<post> (); bool glyph_names = c->plan->flags & HB_SUBSET_FLAGS_GLYPH_NAMES; if (!serialize (c->serializer, glyph_names)) return_trace (false); #ifndef HB_NO_VAR if (c->plan->normalized_coords) { auto &MVAR = *c->plan->source->table.MVAR; auto *table = post_prime; HB_ADD_MVAR_VAR (HB_OT_METRICS_TAG_UNDERLINE_SIZE, underlineThickness); HB_ADD_MVAR_VAR (HB_OT_METRICS_TAG_UNDERLINE_OFFSET, underlinePosition); } #endif Triple *axis_range; if (c->plan->user_axes_location.has (HB_TAG ('s','l','n','t'), &axis_range)) { float italic_angle = hb_max (-90.0, hb_min (axis_range->middle, 90.0)); if (post_prime->italicAngle.to_float () != italic_angle) post_prime->italicAngle.set_float (italic_angle); } if (glyph_names && version.major == 2) { hb_barrier (); return_trace (v2X.subset (c)); } return_trace (true); } struct accelerator_t { friend struct postV2Tail; accelerator_t (hb_face_t *face) { table = hb_sanitize_context_t ().reference_table<post> (face); unsigned int table_length = table.get_length (); version = table->version.to_int (); if (version != 0x00020000) return; hb_barrier (); const postV2Tail &v2 = table->v2X; glyphNameIndex = &v2.glyphNameIndex; pool = &StructAfter<uint8_t> (v2.glyphNameIndex); const uint8_t *end = (const uint8_t *) (const void *) table + table_length; index_to_offset.alloc (hb_min (face->get_num_glyphs (), table_length / 8)); for (const uint8_t *data = pool; index_to_offset.length < 65535 && data < end && data + *data < end; data += 1 + *data) index_to_offset.push (data - pool); } ~accelerator_t () { hb_free (gids_sorted_by_name.get_acquire ()); table.destroy (); } bool get_glyph_name (hb_codepoint_t glyph, char *buf, unsigned int buf_len) const { hb_bytes_t s = find_glyph_name (glyph); if (!s.length) return false; if (!buf_len) return true; unsigned int len = hb_min (buf_len - 1, s.length); strncpy (buf, s.arrayZ, len); buf[len] = '\0'; return true; } bool get_glyph_from_name (const char *name, int len, hb_codepoint_t *glyph) const { unsigned int count = get_glyph_count (); if (unlikely (!count)) return false; if (len < 0) len = strlen (name); if (unlikely (!len)) return false; retry: uint16_t *gids = gids_sorted_by_name.get_acquire (); if (unlikely (!gids)) { gids = (uint16_t *) hb_malloc (count * sizeof (gids[0])); if (unlikely (!gids)) return false; /* Anything better?! */ for (unsigned int i = 0; i < count; i++) gids[i] = i; hb_qsort (gids, count, sizeof (gids[0]), cmp_gids, (void *) this); if (unlikely (!gids_sorted_by_name.cmpexch (nullptr, gids))) { hb_free (gids); goto retry; } } hb_bytes_t st (name, len); auto* gid = hb_bsearch (st, gids, count, sizeof (gids[0]), cmp_key, (void *) this); if (gid) { *glyph = *gid; return true; } return false; } hb_blob_ptr_t<post> table; protected: unsigned int get_glyph_count () const { if (version == 0x00010000) { hb_barrier (); return format1_names_length; } if (version == 0x00020000) { hb_barrier (); return glyphNameIndex->len; } return 0; } static int cmp_gids (const void *pa, const void *pb, void *arg) { const accelerator_t *thiz = (const accelerator_t *) arg; uint16_t a = * (const uint16_t *) pa; uint16_t b = * (const uint16_t *) pb; return thiz->find_glyph_name (b).cmp (thiz->find_glyph_name (a)); } static int cmp_key (const void *pk, const void *po, void *arg) { const accelerator_t *thiz = (const accelerator_t *) arg; const hb_bytes_t *key = (const hb_bytes_t *) pk; uint16_t o = * (const uint16_t *) po; return thiz->find_glyph_name (o).cmp (*key); } hb_bytes_t find_glyph_name (hb_codepoint_t glyph) const { if (version == 0x00010000) { hb_barrier (); if (glyph >= format1_names_length) return hb_bytes_t (); return format1_names (glyph); } if (version != 0x00020000) return hb_bytes_t (); hb_barrier (); if (glyph >= glyphNameIndex->len) return hb_bytes_t (); unsigned int index = glyphNameIndex->arrayZ[glyph]; if (index < format1_names_length) return format1_names (index); index -= format1_names_length; if (index >= index_to_offset.length) return hb_bytes_t (); unsigned int offset = index_to_offset[index]; const uint8_t *data = pool + offset; unsigned int name_length = *data; data++; return hb_bytes_t ((const char *) data, name_length); } private: uint32_t version; const Array16Of<HBUINT16> *glyphNameIndex = nullptr; hb_vector_t<uint32_t> index_to_offset; const uint8_t *pool = nullptr; hb_atomic_ptr_t<uint16_t *> gids_sorted_by_name; }; bool has_data () const { return version.to_int (); } bool sanitize (hb_sanitize_context_t *c) const { TRACE_SANITIZE (this); return_trace (c->check_struct (this) && hb_barrier () && (version.to_int () == 0x00010000 || (version.to_int () == 0x00020000 && hb_barrier () && v2X.sanitize (c)) || version.to_int () == 0x00030000)); } public: FixedVersion<>version; /* 0x00010000 for version 1.0 * 0x00020000 for version 2.0 * 0x00025000 for version 2.5 (deprecated) * 0x00030000 for version 3.0 */ F16DOT16 italicAngle; /* Italic angle in counter-clockwise degrees * from the vertical. Zero for upright text, * negative for text that leans to the right * (forward). */ FWORD underlinePosition; /* This is the suggested distance of the top * of the underline from the baseline * (negative values indicate below baseline). * The PostScript definition of this FontInfo * dictionary key (the y coordinate of the * center of the stroke) is not used for * historical reasons. The value of the * PostScript key may be calculated by * subtracting half the underlineThickness * from the value of this field. */ FWORD underlineThickness; /* Suggested values for the underline thickness. */ HBUINT32 isFixedPitch; /* Set to 0 if the font is proportionally * spaced, non-zero if the font is not * proportionally spaced (i.e. monospaced). */ HBUINT32 minMemType42; /* Minimum memory usage when an OpenType font * is downloaded. */ HBUINT32 maxMemType42; /* Maximum memory usage when an OpenType font * is downloaded. */ HBUINT32 minMemType1; /* Minimum memory usage when an OpenType font * is downloaded as a Type 1 font. */ HBUINT32 maxMemType1; /* Maximum memory usage when an OpenType font * is downloaded as a Type 1 font. */ postV2Tail v2X; DEFINE_SIZE_MIN (32); }; struct post_accelerator_t : post::accelerator_t { post_accelerator_t (hb_face_t *face) : post::accelerator_t (face) {} }; } /* namespace OT */ #endif /* HB_OT_POST_TABLE_HH */