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/*
* 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 = hb_min (c->plan->num_output_glyphs (), 0xFFFFu);
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->flags & HB_SUBSET_FLAGS_NO_HINTING)
drop_hint_fields (dest_v1);
if (c->plan->normalized_coords)
instancing_update_fields (c->plan->head_maxp_info, dest_v1);
}
return_trace (true);
}
void instancing_update_fields (head_maxp_info_t& maxp_info, maxpV1Tail* dest_v1) const
{
dest_v1->maxPoints = maxp_info.maxPoints;
dest_v1->maxContours = maxp_info.maxContours;
dest_v1->maxCompositePoints = maxp_info.maxCompositePoints;
dest_v1->maxCompositeContours = maxp_info.maxCompositeContours;
dest_v1->maxComponentElements = maxp_info.maxComponentElements;
dest_v1->maxComponentDepth = maxp_info.maxComponentDepth;
}
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 */
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