HarfBuzz text shaping engine
http://harfbuzz.github.io/
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148 lines
4.7 KiB
148 lines
4.7 KiB
/* |
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* Copyright © 2011,2012 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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* Google Author(s): Behdad Esfahbod |
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*/ |
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#ifndef HB_OT_MAXP_TABLE_HH |
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#define HB_OT_MAXP_TABLE_HH |
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#include "hb-open-type.hh" |
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namespace OT { |
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/* |
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* maxp -- Maximum Profile |
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* https://docs.microsoft.com/en-us/typography/opentype/spec/maxp |
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*/ |
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#define HB_OT_TAG_maxp HB_TAG('m','a','x','p') |
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struct maxpV1Tail |
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{ |
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inline bool sanitize (hb_sanitize_context_t *c) const |
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{ |
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TRACE_SANITIZE (this); |
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return_trace (c->check_struct (this)); |
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} |
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HBUINT16 maxPoints; /* Maximum points in a non-composite glyph. */ |
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HBUINT16 maxContours; /* Maximum contours in a non-composite glyph. */ |
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HBUINT16 maxCompositePoints; /* Maximum points in a composite glyph. */ |
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HBUINT16 maxCompositeContours; /* Maximum contours in a composite glyph. */ |
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HBUINT16 maxZones; /* 1 if instructions do not use the twilight zone (Z0), |
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* or 2 if instructions do use Z0; should be set to 2 in |
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* most cases. */ |
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HBUINT16 maxTwilightPoints; /* Maximum points used in Z0. */ |
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HBUINT16 maxStorage; /* Number of Storage Area locations. */ |
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HBUINT16 maxFunctionDefs; /* Number of FDEFs, equal to the highest function number + 1. */ |
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HBUINT16 maxInstructionDefs; /* Number of IDEFs. */ |
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HBUINT16 maxStackElements; /* Maximum stack depth. (This includes Font and CVT |
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* Programs, as well as the instructions for each glyph.) */ |
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HBUINT16 maxSizeOfInstructions; /* Maximum byte count for glyph instructions. */ |
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HBUINT16 maxComponentElements; /* Maximum number of components referenced at |
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* "top level" for any composite glyph. */ |
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HBUINT16 maxComponentDepth; /* Maximum levels of recursion; 1 for simple components. */ |
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public: |
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DEFINE_SIZE_STATIC (26); |
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}; |
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struct maxp |
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{ |
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enum { tableTag = HB_OT_TAG_maxp }; |
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inline unsigned int get_num_glyphs (void) const |
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{ |
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return numGlyphs; |
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} |
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inline void set_num_glyphs (unsigned int count) |
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{ |
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numGlyphs.set (count); |
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} |
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inline bool sanitize (hb_sanitize_context_t *c) const |
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{ |
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TRACE_SANITIZE (this); |
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if (unlikely (!c->check_struct (this))) |
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return_trace (false); |
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if (version.major == 1) |
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{ |
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const maxpV1Tail &v1 = StructAfter<maxpV1Tail> (*this); |
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return_trace (v1.sanitize (c)); |
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} |
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return_trace (likely (version.major == 0 && version.minor == 0x5000u)); |
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} |
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inline bool subset (hb_subset_plan_t *plan) const |
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{ |
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hb_blob_t *maxp_blob = hb_sanitize_context_t().reference_table<maxp> (plan->source); |
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hb_blob_t *maxp_prime_blob = hb_blob_copy_writable_or_fail (maxp_blob); |
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hb_blob_destroy (maxp_blob); |
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if (unlikely (!maxp_prime_blob)) { |
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return false; |
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} |
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maxp *maxp_prime = (maxp *) hb_blob_get_data (maxp_prime_blob, nullptr); |
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maxp_prime->set_num_glyphs (plan->glyphs.len); |
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if (plan->drop_hints) |
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drop_hint_fields (plan, maxp_prime); |
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bool result = plan->add_table (HB_OT_TAG_maxp, maxp_prime_blob); |
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hb_blob_destroy (maxp_prime_blob); |
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return result; |
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} |
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static inline void drop_hint_fields (hb_subset_plan_t *plan HB_UNUSED, maxp *maxp_prime) |
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{ |
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if (maxp_prime->version.major == 1) |
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{ |
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maxpV1Tail &v1 = StructAfter<maxpV1Tail> (*maxp_prime); |
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v1.maxZones.set (1); |
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v1.maxTwilightPoints.set (0); |
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v1.maxStorage.set (0); |
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v1.maxFunctionDefs.set (0); |
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v1.maxInstructionDefs.set (0); |
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v1.maxStackElements.set (0); |
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v1.maxSizeOfInstructions.set (0); |
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} |
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} |
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protected: |
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FixedVersion<>version; /* Version of the maxp table (0.5 or 1.0), |
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* 0x00005000u or 0x00010000u. */ |
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HBUINT16 numGlyphs; /* The number of glyphs in the font. */ |
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/*maxpV1Tail v1Tail[VAR]; */ |
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public: |
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DEFINE_SIZE_STATIC (6); |
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}; |
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} /* namespace OT */ |
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#endif /* HB_OT_MAXP_TABLE_HH */
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