2 * Copyright © 2018 Google, Inc.
4 * This is part of HarfBuzz, a text shaping library.
6 * Permission is hereby granted, without written agreement and without
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8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
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13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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24 * Google Author(s): Garret Rieger
27 #ifndef HB_OT_HDMX_TABLE_HH
28 #define HB_OT_HDMX_TABLE_HH
30 #include "hb-open-type.hh"
33 * hdmx -- Horizontal Device Metrics
34 * https://docs.microsoft.com/en-us/typography/opentype/spec/hdmx
36 #define HB_OT_TAG_hdmx HB_TAG('h','d','m','x')
44 static unsigned int get_size (unsigned count)
45 { return hb_ceil_to_4 (min_size + count * HBUINT8::static_size); }
47 template<typename Iterator,
48 hb_requires (hb_is_iterator (Iterator))>
49 bool serialize (hb_serialize_context_t *c,
52 const hb_vector_t<hb_codepoint_pair_t> new_to_old_gid_list,
55 TRACE_SERIALIZE (this);
57 if (unlikely (!c->extend (this, num_glyphs))) return_trace (false);
59 this->pixelSize = pixelSize;
62 | hb_reduce (hb_max, 0u);
64 for (auto &_ : new_to_old_gid_list)
65 widthsZ[_.first] = *it++;
70 bool sanitize (hb_sanitize_context_t *c, unsigned sizeDeviceRecord) const
72 TRACE_SANITIZE (this);
73 return_trace (likely (c->check_struct (this) &&
74 c->check_range (this, sizeDeviceRecord)));
77 HBUINT8 pixelSize; /* Pixel size for following widths (as ppem). */
78 HBUINT8 maxWidth; /* Maximum width. */
79 UnsizedArrayOf<HBUINT8> widthsZ; /* Array of widths (numGlyphs is from the 'maxp' table). */
81 DEFINE_SIZE_UNBOUNDED (2);
87 static constexpr hb_tag_t tableTag = HB_OT_TAG_hdmx;
89 unsigned int get_size () const
90 { return min_size + numRecords * sizeDeviceRecord; }
92 template<typename Iterator,
93 hb_requires (hb_is_iterator (Iterator))>
94 bool serialize (hb_serialize_context_t *c,
97 const hb_vector_t<hb_codepoint_pair_t> &new_to_old_gid_list,
100 TRACE_SERIALIZE (this);
102 if (unlikely (!c->extend_min ((*this)))) return_trace (false);
104 this->version = version;
105 this->numRecords = it.len ();
106 this->sizeDeviceRecord = DeviceRecord::get_size (num_glyphs);
108 for (const hb_item_type<Iterator>& _ : +it)
109 c->start_embed<DeviceRecord> ()->serialize (c, _.first, _.second, new_to_old_gid_list, num_glyphs);
111 return_trace (c->successful ());
115 bool subset (hb_subset_context_t *c) const
119 auto *hdmx_prime = c->serializer->start_embed <hdmx> ();
121 unsigned num_input_glyphs = get_num_glyphs ();
123 + hb_range ((unsigned) numRecords)
124 | hb_map ([c, num_input_glyphs, this] (unsigned _)
126 const DeviceRecord *device_record =
127 &StructAtOffset<DeviceRecord> (&firstDeviceRecord,
128 _ * sizeDeviceRecord);
130 + hb_iter (c->plan->new_to_old_gid_list)
131 | hb_map ([num_input_glyphs, device_record] (hb_codepoint_pair_t _)
133 return device_record->widthsZ.as_array (num_input_glyphs) [_.second];
136 return hb_pair ((unsigned) device_record->pixelSize, +row);
140 hdmx_prime->serialize (c->serializer, version, it,
141 c->plan->new_to_old_gid_list,
142 c->plan->num_output_glyphs ());
146 unsigned get_num_glyphs () const
148 return sizeDeviceRecord - DeviceRecord::min_size;
151 bool sanitize (hb_sanitize_context_t *c) const
153 TRACE_SANITIZE (this);
154 return_trace (c->check_struct (this) &&
155 !hb_unsigned_mul_overflows (numRecords, sizeDeviceRecord) &&
156 min_size + numRecords * sizeDeviceRecord > numRecords * sizeDeviceRecord &&
157 sizeDeviceRecord >= DeviceRecord::min_size &&
158 c->check_range (this, get_size ()));
162 HBUINT16 version; /* Table version number (0) */
163 HBUINT16 numRecords; /* Number of device records. */
164 HBUINT32 sizeDeviceRecord;
165 /* Size of a device record, 32-bit aligned. */
166 DeviceRecord firstDeviceRecord;
167 /* Array of device records. */
175 #endif /* HB_OT_HDMX_TABLE_HH */