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author | Karl Berry <karl@freefriends.org> | 2021-02-25 19:22:25 +0000 |
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committer | Karl Berry <karl@freefriends.org> | 2021-02-25 19:22:25 +0000 |
commit | ad547a6b5986815fda458221149728d9d9ab1d87 (patch) | |
tree | 16296910eb3eca724371474ea9aea3994dc69614 /Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-hdmx-table.hh | |
parent | 947b43de3dd21d58ccc2ffadefc4441ea1c2a813 (diff) |
restore Build,TODO from r57911
git-svn-id: svn://tug.org/texlive/trunk@57915 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-hdmx-table.hh')
-rw-r--r-- | Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-hdmx-table.hh | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-hdmx-table.hh b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-hdmx-table.hh new file mode 100644 index 00000000000..c9c391bad5f --- /dev/null +++ b/Build/source/libs/harfbuzz/harfbuzz-src/src/hb-ot-hdmx-table.hh @@ -0,0 +1,177 @@ +/* + * Copyright © 2018 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): Garret Rieger + */ + +#ifndef HB_OT_HDMX_TABLE_HH +#define HB_OT_HDMX_TABLE_HH + +#include "hb-open-type.hh" + +/* + * hdmx -- Horizontal Device Metrics + * https://docs.microsoft.com/en-us/typography/opentype/spec/hdmx + */ +#define HB_OT_TAG_hdmx HB_TAG('h','d','m','x') + + +namespace OT { + + +struct DeviceRecord +{ + static unsigned int get_size (unsigned count) + { return hb_ceil_to_4 (min_size + count * HBUINT8::static_size); } + + template<typename Iterator, + hb_requires (hb_is_iterator (Iterator))> + bool serialize (hb_serialize_context_t *c, unsigned pixelSize, Iterator it) + { + TRACE_SERIALIZE (this); + + unsigned length = it.len (); + + if (unlikely (!c->extend (*this, length))) return_trace (false); + + this->pixelSize = pixelSize; + this->maxWidth = + + it + | hb_reduce (hb_max, 0u); + + + it + | hb_sink (widthsZ.as_array (length)); + + return_trace (true); + } + + bool sanitize (hb_sanitize_context_t *c, unsigned sizeDeviceRecord) const + { + TRACE_SANITIZE (this); + return_trace (likely (c->check_struct (this) && + c->check_range (this, sizeDeviceRecord))); + } + + HBUINT8 pixelSize; /* Pixel size for following widths (as ppem). */ + HBUINT8 maxWidth; /* Maximum width. */ + UnsizedArrayOf<HBUINT8> widthsZ; /* Array of widths (numGlyphs is from the 'maxp' table). */ + public: + DEFINE_SIZE_ARRAY (2, widthsZ); +}; + + +struct hdmx +{ + static constexpr hb_tag_t tableTag = HB_OT_TAG_hdmx; + + unsigned int get_size () const + { return min_size + numRecords * sizeDeviceRecord; } + + const DeviceRecord& operator [] (unsigned int i) const + { + /* XXX Null(DeviceRecord) is NOT safe as it's num-glyphs lengthed. + * https://github.com/harfbuzz/harfbuzz/issues/1300 */ + if (unlikely (i >= numRecords)) return Null (DeviceRecord); + return StructAtOffset<DeviceRecord> (&this->firstDeviceRecord, i * sizeDeviceRecord); + } + + template<typename Iterator, + hb_requires (hb_is_iterator (Iterator))> + bool serialize (hb_serialize_context_t *c, unsigned version, Iterator it) + { + TRACE_SERIALIZE (this); + + if (unlikely (!c->extend_min ((*this)))) return_trace (false); + + this->version = version; + this->numRecords = it.len (); + this->sizeDeviceRecord = DeviceRecord::get_size (it ? (*it).second.len () : 0); + + for (const hb_item_type<Iterator>& _ : +it) + c->start_embed<DeviceRecord> ()->serialize (c, _.first, _.second); + + return_trace (c->successful); + } + + + bool subset (hb_subset_context_t *c) const + { + TRACE_SUBSET (this); + + hdmx *hdmx_prime = c->serializer->start_embed <hdmx> (); + if (unlikely (!hdmx_prime)) return_trace (false); + + auto it = + + hb_range ((unsigned) numRecords) + | hb_map ([c, this] (unsigned _) + { + const DeviceRecord *device_record = + &StructAtOffset<DeviceRecord> (&firstDeviceRecord, + _ * sizeDeviceRecord); + auto row = + + hb_range (c->plan->num_output_glyphs ()) + | hb_map (c->plan->reverse_glyph_map) + | hb_map ([this, c, device_record] (hb_codepoint_t _) + { + if (c->plan->is_empty_glyph (_)) + return Null (HBUINT8); + return device_record->widthsZ.as_array (get_num_glyphs ()) [_]; + }) + ; + return hb_pair ((unsigned) device_record->pixelSize, +row); + }) + ; + + hdmx_prime->serialize (c->serializer, version, it); + return_trace (true); + } + + unsigned get_num_glyphs () const + { + return sizeDeviceRecord - DeviceRecord::min_size; + } + + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this) && + !hb_unsigned_mul_overflows (numRecords, sizeDeviceRecord) && + sizeDeviceRecord >= DeviceRecord::min_size && + c->check_range (this, get_size ())); + } + + protected: + HBUINT16 version; /* Table version number (0) */ + HBUINT16 numRecords; /* Number of device records. */ + HBUINT32 sizeDeviceRecord; + /* Size of a device record, 32-bit aligned. */ + DeviceRecord firstDeviceRecord; + /* Array of device records. */ + public: + DEFINE_SIZE_MIN (8); +}; + +} /* namespace OT */ + + +#endif /* HB_OT_HDMX_TABLE_HH */ |