diff options
Diffstat (limited to 'gfx/harfbuzz/src/hb-ot-hdmx-table.hh')
| -rw-r--r-- | gfx/harfbuzz/src/hb-ot-hdmx-table.hh | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-ot-hdmx-table.hh b/gfx/harfbuzz/src/hb-ot-hdmx-table.hh new file mode 100644 index 0000000000..8582dbe27d --- /dev/null +++ b/gfx/harfbuzz/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, + const hb_vector_t<hb_codepoint_pair_t> new_to_old_gid_list, + unsigned num_glyphs) + { + TRACE_SERIALIZE (this); + + if (unlikely (!c->extend (this, num_glyphs))) return_trace (false); + + this->pixelSize = pixelSize; + this->maxWidth = + + it + | hb_reduce (hb_max, 0u); + + for (auto &_ : new_to_old_gid_list) + widthsZ[_.first] = *it++; + + return_trace (true); + } + + bool sanitize (hb_sanitize_context_t *c, unsigned sizeDeviceRecord) const + { + TRACE_SANITIZE (this); + return_trace (likely (c->check_struct (this) && + hb_barrier () && + 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_UNBOUNDED (2); +}; + + +struct hdmx +{ + static constexpr hb_tag_t tableTag = HB_OT_TAG_hdmx; + + unsigned int get_size () const + { return min_size + numRecords * sizeDeviceRecord; } + + template<typename Iterator, + hb_requires (hb_is_iterator (Iterator))> + bool serialize (hb_serialize_context_t *c, + unsigned version, + Iterator it, + const hb_vector_t<hb_codepoint_pair_t> &new_to_old_gid_list, + unsigned num_glyphs) + { + TRACE_SERIALIZE (this); + + if (unlikely (!c->extend_min ((*this)))) return_trace (false); + + this->version = version; + this->numRecords = it.len (); + this->sizeDeviceRecord = DeviceRecord::get_size (num_glyphs); + + for (const hb_item_type<Iterator>& _ : +it) + c->start_embed<DeviceRecord> ()->serialize (c, _.first, _.second, new_to_old_gid_list, num_glyphs); + + return_trace (c->successful ()); + } + + + bool subset (hb_subset_context_t *c) const + { + TRACE_SUBSET (this); + + auto *hdmx_prime = c->serializer->start_embed <hdmx> (); + + unsigned num_input_glyphs = get_num_glyphs (); + auto it = + + hb_range ((unsigned) numRecords) + | hb_map ([c, num_input_glyphs, this] (unsigned _) + { + const DeviceRecord *device_record = + &StructAtOffset<DeviceRecord> (&firstDeviceRecord, + _ * sizeDeviceRecord); + auto row = + + hb_iter (c->plan->new_to_old_gid_list) + | hb_map ([num_input_glyphs, device_record] (hb_codepoint_pair_t _) + { + return device_record->widthsZ.as_array (num_input_glyphs) [_.second]; + }) + ; + return hb_pair ((unsigned) device_record->pixelSize, +row); + }) + ; + + hdmx_prime->serialize (c->serializer, version, it, + c->plan->new_to_old_gid_list, + c->plan->num_output_glyphs ()); + 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_barrier () && + !hb_unsigned_mul_overflows (numRecords, sizeDeviceRecord) && + min_size + numRecords * sizeDeviceRecord > 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 */ |