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Diffstat (limited to 'thirdparty/harfbuzz/src/hb-ot-maxp-table.hh')
| -rw-r--r-- | thirdparty/harfbuzz/src/hb-ot-maxp-table.hh | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/thirdparty/harfbuzz/src/hb-ot-maxp-table.hh b/thirdparty/harfbuzz/src/hb-ot-maxp-table.hh new file mode 100644 index 0000000000..929956d12b --- /dev/null +++ b/thirdparty/harfbuzz/src/hb-ot-maxp-table.hh @@ -0,0 +1,142 @@ +/* + * 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. + * + * Google Author(s): Behdad Esfahbod + */ + +#ifndef HB_OT_MAXP_TABLE_HH +#define HB_OT_MAXP_TABLE_HH + +#include "hb-open-type.hh" + +namespace OT { + + +/* + * maxp -- Maximum Profile + * https://docs.microsoft.com/en-us/typography/opentype/spec/maxp + */ + +#define HB_OT_TAG_maxp HB_TAG('m','a','x','p') + +struct maxpV1Tail +{ + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this)); + } + + HBUINT16 maxPoints; /* Maximum points in a non-composite glyph. */ + HBUINT16 maxContours; /* Maximum contours in a non-composite glyph. */ + HBUINT16 maxCompositePoints; /* Maximum points in a composite glyph. */ + HBUINT16 maxCompositeContours; /* Maximum contours in a composite glyph. */ + HBUINT16 maxZones; /* 1 if instructions do not use the twilight zone (Z0), + * or 2 if instructions do use Z0; should be set to 2 in + * most cases. */ + HBUINT16 maxTwilightPoints; /* Maximum points used in Z0. */ + HBUINT16 maxStorage; /* Number of Storage Area locations. */ + HBUINT16 maxFunctionDefs; /* Number of FDEFs, equal to the highest function number + 1. */ + HBUINT16 maxInstructionDefs; /* Number of IDEFs. */ + HBUINT16 maxStackElements; /* Maximum stack depth. (This includes Font and CVT + * Programs, as well as the instructions for each glyph.) */ + HBUINT16 maxSizeOfInstructions; /* Maximum byte count for glyph instructions. */ + HBUINT16 maxComponentElements; /* Maximum number of components referenced at + * "top level" for any composite glyph. */ + HBUINT16 maxComponentDepth; /* Maximum levels of recursion; 1 for simple components. */ + public: + DEFINE_SIZE_STATIC (26); +}; + + +struct maxp +{ + static constexpr hb_tag_t tableTag = HB_OT_TAG_maxp; + + unsigned int get_num_glyphs () const { return numGlyphs; } + + void set_num_glyphs (unsigned int count) + { + numGlyphs = count; + } + + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + if (unlikely (!c->check_struct (this))) + return_trace (false); + + if (version.major == 1) + { + const maxpV1Tail &v1 = StructAfter<maxpV1Tail> (*this); + return_trace (v1.sanitize (c)); + } + return_trace (likely (version.major == 0 && version.minor == 0x5000u)); + } + + bool subset (hb_subset_context_t *c) const + { + TRACE_SUBSET (this); + maxp *maxp_prime = c->serializer->embed (this); + if (unlikely (!maxp_prime)) return_trace (false); + + maxp_prime->numGlyphs = c->plan->num_output_glyphs (); + if (maxp_prime->version.major == 1) + { + const maxpV1Tail *src_v1 = &StructAfter<maxpV1Tail> (*this); + maxpV1Tail *dest_v1 = c->serializer->embed<maxpV1Tail> (src_v1); + if (unlikely (!dest_v1)) return_trace (false); + + if (c->plan->drop_hints) + drop_hint_fields (dest_v1); + } + + return_trace (true); + } + + static void drop_hint_fields (maxpV1Tail* dest_v1) + { + dest_v1->maxZones = 1; + dest_v1->maxTwilightPoints = 0; + dest_v1->maxStorage = 0; + dest_v1->maxFunctionDefs = 0; + dest_v1->maxInstructionDefs = 0; + dest_v1->maxStackElements = 0; + dest_v1->maxSizeOfInstructions = 0; + } + + protected: + FixedVersion<>version;/* Version of the maxp table (0.5 or 1.0), + * 0x00005000u or 0x00010000u. */ + HBUINT16 numGlyphs; + /* The number of glyphs in the font. */ +/*maxpV1Tail v1Tail[HB_VAR_ARRAY]; */ + public: + DEFINE_SIZE_STATIC (6); +}; + + +} /* namespace OT */ + + +#endif /* HB_OT_MAXP_TABLE_HH */ |