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Diffstat (limited to 'gfx/harfbuzz/src/hb-ot-post-table.hh')
| -rw-r--r-- | gfx/harfbuzz/src/hb-ot-post-table.hh | 352 |
1 files changed, 352 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-ot-post-table.hh b/gfx/harfbuzz/src/hb-ot-post-table.hh new file mode 100644 index 0000000000..8132dcfb91 --- /dev/null +++ b/gfx/harfbuzz/src/hb-ot-post-table.hh @@ -0,0 +1,352 @@ +/* + * 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.f, hb_min (axis_range->middle, 90.f)); + 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 && 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 */ |