--- /dev/null 2019-02-21 13:14:21.200397537 -0800 +++ new/src/java.desktop/share/native/libfontmanager/harfbuzz/hb-ot-hdmx-table.hh 2019-02-28 12:04:43.070502234 -0800 @@ -0,0 +1,214 @@ +/* + * 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 sizeDeviceRecord; + hb_subset_plan_t *subset_plan; + + void init (const DeviceRecord *source_device_record, + unsigned int sizeDeviceRecord, + hb_subset_plan_t *subset_plan) + { + this->source_device_record = source_device_record; + this->sizeDeviceRecord = sizeDeviceRecord; + this->subset_plan = subset_plan; + } + + unsigned int len () const + { return this->subset_plan->glyphs.length; } + + const HBUINT8* operator [] (unsigned int i) const + { + if (unlikely (i >= len ())) return nullptr; + hb_codepoint_t gid = this->subset_plan->glyphs [i]; + + if (gid >= sizeDeviceRecord - DeviceRecord::min_size) + return nullptr; + return &(this->source_device_record->widthsZ[gid]); + } + }; + + static unsigned int get_size (unsigned int count) + { return hb_ceil_to_4 (min_size + count * HBUINT8::static_size); } + + bool serialize (hb_serialize_context_t *c, const SubsetView &subset_view) + { + TRACE_SERIALIZE (this); + + unsigned int size = get_size (subset_view.len ()); + if (unlikely (!c->allocate_size (size))) + { + DEBUG_MSG(SUBSET, nullptr, "Couldn't allocate enough space for DeviceRecord: %d.", + size); + return_trace (false); + } + + this->pixelSize.set (subset_view.source_device_record->pixelSize); + this->maxWidth.set (subset_view.source_device_record->maxWidth); + + 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); + } + widthsZ[i].set (*width); + } + + return_trace (true); + } + + bool sanitize (hb_sanitize_context_t *c, unsigned int 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 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 (&this->firstDeviceRecord, i * sizeDeviceRecord); + } + + 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->numRecords.set (source_hdmx->numRecords); + this->sizeDeviceRecord.set (DeviceRecord::get_size (plan->glyphs.length)); + + for (unsigned int i = 0; i < source_hdmx->numRecords; i++) + { + DeviceRecord::SubsetView subset_view; + subset_view.init (&(*source_hdmx)[i], source_hdmx->sizeDeviceRecord, plan); + + if (!c->start_embed ()->serialize (c, subset_view)) + return_trace (false); + } + + return_trace (true); + } + + static size_t get_subsetted_size (const hdmx *source_hdmx, hb_subset_plan_t *plan) + { + return min_size + source_hdmx->numRecords * DeviceRecord::get_size (plan->glyphs.length); + } + + bool subset (hb_subset_plan_t *plan) const + { + size_t dest_size = get_subsetted_size (this, 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); + DEBUG_MSG(SUBSET, nullptr, "Failed to serialize write new hdmx."); + 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; + } + + 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 */