| /* |
| * 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 */ |