/* * 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 { struct SubsetView { const DeviceRecord *source_device_record; unsigned int size_device_record; hb_subset_plan_t *subset_plan; inline void init(const DeviceRecord *source_device_record, unsigned int size_device_record, hb_subset_plan_t *subset_plan) { this->source_device_record = source_device_record; this->size_device_record = size_device_record; this->subset_plan = subset_plan; } inline unsigned int len () const { return this->subset_plan->glyphs.len; } inline const HBUINT8* operator [] (unsigned int i) const { if (unlikely (i >= len())) return nullptr; hb_codepoint_t gid = this->subset_plan->glyphs [i]; const HBUINT8* width = &(this->source_device_record->widths[gid]); if (width < ((const HBUINT8 *) this->source_device_record) + size_device_record) return width; else return nullptr; } }; static inline unsigned int get_size (unsigned int count) { unsigned int raw_size = min_size + count * HBUINT8::static_size; if (raw_size % 4) /* Align to 32 bits */ return raw_size + (4 - (raw_size % 4)); return raw_size; } inline bool serialize (hb_serialize_context_t *c, const SubsetView &subset_view) { TRACE_SERIALIZE (this); if (unlikely (!c->allocate_size (get_size (subset_view.len())))) return_trace (false); this->pixel_size.set (subset_view.source_device_record->pixel_size); this->max_width.set (subset_view.source_device_record->max_width); for (unsigned int i = 0; i < subset_view.len(); i++) { const HBUINT8 *width = subset_view[i]; if (!width) { DEBUG_MSG(SUBSET, nullptr, "HDMX width for new gid %d is missing.", i); return_trace (false); } widths[i].set (*width); } return_trace (true); } inline bool sanitize (hb_sanitize_context_t *c, unsigned int size_device_record) const { TRACE_SANITIZE (this); return_trace (likely (c->check_struct (this) && c->check_range (this, size_device_record))); } HBUINT8 pixel_size; /* Pixel size for following widths (as ppem). */ HBUINT8 max_width; /* Maximum width. */ HBUINT8 widths[VAR]; /* Array of widths (numGlyphs is from the 'maxp' table). */ public: DEFINE_SIZE_ARRAY (2, widths); }; struct hdmx { static const hb_tag_t tableTag = HB_OT_TAG_hdmx; inline unsigned int get_size (void) const { return min_size + num_records * size_device_record; } inline const DeviceRecord& operator [] (unsigned int i) const { if (unlikely (i >= num_records)) return Null(DeviceRecord); return StructAtOffset (this->data, i * size_device_record); } inline bool serialize (hb_serialize_context_t *c, const hdmx *source_hdmx, hb_subset_plan_t *plan) { TRACE_SERIALIZE (this); if (unlikely (!c->extend_min ((*this)))) return_trace (false); this->version.set (source_hdmx->version); this->num_records.set (source_hdmx->num_records); this->size_device_record.set (DeviceRecord::get_size (plan->glyphs.len)); for (unsigned int i = 0; i < source_hdmx->num_records; i++) { DeviceRecord::SubsetView subset_view; subset_view.init (&(*source_hdmx)[i], source_hdmx->size_device_record, plan); if (!c->start_embed ()->serialize (c, subset_view)) return_trace (false); } return_trace (true); } static inline size_t get_subsetted_size (hb_subset_plan_t *plan) { return min_size + DeviceRecord::get_size (plan->glyphs.len); } inline bool subset (hb_subset_plan_t *plan) const { size_t dest_size = get_subsetted_size (plan); hdmx *dest = (hdmx *) malloc (dest_size); if (unlikely (!dest)) { DEBUG_MSG(SUBSET, nullptr, "Unable to alloc %lu for hdmx subset output.", (unsigned long) dest_size); return false; } hb_serialize_context_t c (dest, dest_size); hdmx *hdmx_prime = c.start_serialize (); if (!hdmx_prime || !hdmx_prime->serialize (&c, this, plan)) { free (dest); return false; } c.end_serialize (); hb_blob_t *hdmx_prime_blob = hb_blob_create ((const char *) dest, dest_size, HB_MEMORY_MODE_READONLY, dest, free); bool result = plan->add_table (HB_OT_TAG_hdmx, hdmx_prime_blob); hb_blob_destroy (hdmx_prime_blob); return result; } inline bool sanitize (hb_sanitize_context_t *c) const { TRACE_SANITIZE (this); return_trace (c->check_struct (this) && version == 0 && !hb_unsigned_mul_overflows (num_records, size_device_record) && size_device_record >= DeviceRecord::min_size && c->check_range (this, get_size())); } protected: HBUINT16 version; /* Table version number (0) */ HBUINT16 num_records; /* Number of device records. */ HBUINT32 size_device_record; /* Size of a device record, 32-bit aligned. */ HBUINT8 data[VAR]; /* Array of device records. */ public: DEFINE_SIZE_ARRAY (8, data); }; } /* namespace OT */ #endif /* HB_OT_HDMX_TABLE_HH */