146 lines
4.6 KiB
C++
146 lines
4.6 KiB
C++
/*
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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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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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static constexpr hb_tag_t tableTag = HB_OT_TAG_maxp;
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unsigned int get_num_glyphs () const { return numGlyphs; }
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void set_num_glyphs (unsigned int count)
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{
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numGlyphs = count;
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}
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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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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->num_output_glyphs ());
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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 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 = 1;
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v1.maxTwilightPoints = 0;
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v1.maxStorage = 0;
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v1.maxFunctionDefs = 0;
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v1.maxInstructionDefs = 0;
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v1.maxStackElements = 0;
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v1.maxSizeOfInstructions = 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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