149 lines
4.7 KiB
C++
149 lines
4.7 KiB
C++
/*
|
|
* 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
|
|
{
|
|
inline 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 const hb_tag_t tableTag = HB_OT_TAG_maxp;
|
|
|
|
inline unsigned int get_num_glyphs (void) const
|
|
{
|
|
return numGlyphs;
|
|
}
|
|
|
|
inline void set_num_glyphs (unsigned int count)
|
|
{
|
|
numGlyphs.set (count);
|
|
}
|
|
|
|
inline 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));
|
|
}
|
|
|
|
inline bool subset (hb_subset_plan_t *plan) const
|
|
{
|
|
hb_blob_t *maxp_blob = hb_sanitize_context_t().reference_table<maxp> (plan->source);
|
|
hb_blob_t *maxp_prime_blob = hb_blob_copy_writable_or_fail (maxp_blob);
|
|
hb_blob_destroy (maxp_blob);
|
|
|
|
if (unlikely (!maxp_prime_blob)) {
|
|
return false;
|
|
}
|
|
maxp *maxp_prime = (maxp *) hb_blob_get_data (maxp_prime_blob, nullptr);
|
|
|
|
maxp_prime->set_num_glyphs (plan->glyphs.len);
|
|
if (plan->drop_hints)
|
|
drop_hint_fields (plan, maxp_prime);
|
|
|
|
bool result = plan->add_table (HB_OT_TAG_maxp, maxp_prime_blob);
|
|
hb_blob_destroy (maxp_prime_blob);
|
|
return result;
|
|
}
|
|
|
|
static inline void drop_hint_fields (hb_subset_plan_t *plan HB_UNUSED, maxp *maxp_prime)
|
|
{
|
|
if (maxp_prime->version.major == 1)
|
|
{
|
|
maxpV1Tail &v1 = StructAfter<maxpV1Tail> (*maxp_prime);
|
|
v1.maxZones.set (1);
|
|
v1.maxTwilightPoints.set (0);
|
|
v1.maxStorage.set (0);
|
|
v1.maxFunctionDefs.set (0);
|
|
v1.maxInstructionDefs.set (0);
|
|
v1.maxStackElements.set (0);
|
|
v1.maxSizeOfInstructions.set (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[VAR]; */
|
|
public:
|
|
DEFINE_SIZE_STATIC (6);
|
|
};
|
|
|
|
|
|
} /* namespace OT */
|
|
|
|
|
|
#endif /* HB_OT_MAXP_TABLE_HH */
|