Revert of Updating OTS repo from https://github.com/khaledhosny/ots.git

third_party/ots/src/metrics.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "metrics.h"
-
-#include "head.h"
-#include "maxp.h"
-
-// OpenType horizontal and vertical common header format
-// http://www.microsoft.com/typography/otspec/hhea.htm
-// http://www.microsoft.com/typography/otspec/vhea.htm
-
-#define TABLE_NAME "metrics" // XXX: use individual table names
-
-namespace ots {
-
-bool ParseMetricsHeader(OpenTypeFile *file, Buffer *table,
-                        OpenTypeMetricsHeader *header) {
-  if (!table->ReadS16(&header->ascent) ||
-      !table->ReadS16(&header->descent) ||
-      !table->ReadS16(&header->linegap) ||
-      !table->ReadU16(&header->adv_width_max) ||
-      !table->ReadS16(&header->min_sb1) ||
-      !table->ReadS16(&header->min_sb2) ||
-      !table->ReadS16(&header->max_extent) ||
-      !table->ReadS16(&header->caret_slope_rise) ||
-      !table->ReadS16(&header->caret_slope_run) ||
-      !table->ReadS16(&header->caret_offset)) {
-    return OTS_FAILURE_MSG("Failed to read metrics header");
-  }
-
-  if (header->ascent < 0) {
-    OTS_WARNING("bad ascent: %d", header->ascent);
-    header->ascent = 0;
-  }
-  if (header->linegap < 0) {
-    OTS_WARNING("bad linegap: %d", header->linegap);
-    header->linegap = 0;
-  }
-
-  if (!file->head) {
-    return OTS_FAILURE_MSG("Missing head font table");
-  }
-
-  // if the font is non-slanted, caret_offset should be zero.
-  if (!(file->head->mac_style & 2) &&
-      (header->caret_offset != 0)) {
-    OTS_WARNING("bad caret offset: %d", header->caret_offset);
-    header->caret_offset = 0;
-  }
-
-  // skip the reserved bytes
-  if (!table->Skip(8)) {
-    return OTS_FAILURE_MSG("Failed to skip reserverd bytes");
-  }
-
-  int16_t data_format;
-  if (!table->ReadS16(&data_format)) {
-    return OTS_FAILURE_MSG("Failed to read data format");
-  }
-  if (data_format) {
-    return OTS_FAILURE_MSG("Bad data format %d", data_format);
-  }
-
-  if (!table->ReadU16(&header->num_metrics)) {
-    return OTS_FAILURE_MSG("Failed to read number of metrics");
-  }
-
-  if (!file->maxp) {
-    return OTS_FAILURE_MSG("Missing maxp font table");
-  }
-
-  if (header->num_metrics > file->maxp->num_glyphs) {
-    return OTS_FAILURE_MSG("Bad number of metrics %d", header->num_metrics);
-  }
-
-  return true;
-}
-
-bool SerialiseMetricsHeader(const ots::OpenTypeFile *file,
-                            OTSStream *out,
-                            const OpenTypeMetricsHeader *header) {
-  if (!out->WriteU32(header->version) ||
-      !out->WriteS16(header->ascent) ||
-      !out->WriteS16(header->descent) ||
-      !out->WriteS16(header->linegap) ||
-      !out->WriteU16(header->adv_width_max) ||
-      !out->WriteS16(header->min_sb1) ||
-      !out->WriteS16(header->min_sb2) ||
-      !out->WriteS16(header->max_extent) ||
-      !out->WriteS16(header->caret_slope_rise) ||
-      !out->WriteS16(header->caret_slope_run) ||
-      !out->WriteS16(header->caret_offset) ||
-      !out->WriteR64(0) ||  // reserved
-      !out->WriteS16(0) ||  // metric data format
-      !out->WriteU16(header->num_metrics)) {
-    return OTS_FAILURE_MSG("Failed to write metrics");
-  }
-
-  return true;
-}
-
-bool ParseMetricsTable(const ots::OpenTypeFile *file,
-                       Buffer *table,
-                       const uint16_t num_glyphs,
-                       const OpenTypeMetricsHeader *header,
-                       OpenTypeMetricsTable *metrics) {
-  // |num_metrics| is a uint16_t, so it's bounded < 65536. This limits that
-  // amount of memory that we'll allocate for this to a sane amount.
-  const unsigned num_metrics = header->num_metrics;
-
-  if (num_metrics > num_glyphs) {
-    return OTS_FAILURE_MSG("Bad number of metrics %d", num_metrics);
-  }
-  if (!num_metrics) {
-    return OTS_FAILURE_MSG("No metrics!");
-  }
-  const unsigned num_sbs = num_glyphs - num_metrics;
-
-  metrics->entries.reserve(num_metrics);
-  for (unsigned i = 0; i < num_metrics; ++i) {
-    uint16_t adv = 0;
-    int16_t sb = 0;
-    if (!table->ReadU16(&adv) || !table->ReadS16(&sb)) {
-      return OTS_FAILURE_MSG("Failed to read metric %d", i);
-    }
-
-    // This check is bogus, see https://github.com/khaledhosny/ots/issues/36
-#if 0
-    // Since so many fonts don't have proper value on |adv| and |sb|,
-    // we should not call ots_failure() here. For example, about 20% of fonts
-    // in http://www.princexml.com/fonts/ (200+ fonts) fails these tests.
-    if (adv > header->adv_width_max) {
-      OTS_WARNING("bad adv: %u > %u", adv, header->adv_width_max);
-      adv = header->adv_width_max;
-    }
-
-    if (sb < header->min_sb1) {
-      OTS_WARNING("bad sb: %d < %d", sb, header->min_sb1);
-      sb = header->min_sb1;
-    }
-#endif
-
-    metrics->entries.push_back(std::make_pair(adv, sb));
-  }
-
-  metrics->sbs.reserve(num_sbs);
-  for (unsigned i = 0; i < num_sbs; ++i) {
-    int16_t sb;
-    if (!table->ReadS16(&sb)) {
-      // Some Japanese fonts (e.g., mona.ttf) fail this test.
-      return OTS_FAILURE_MSG("Failed to read side bearing %d", i + num_metrics);
-    }
-
-    // This check is bogus, see https://github.com/khaledhosny/ots/issues/36
-#if 0
-    if (sb < header->min_sb1) {
-      // The same as above. Three fonts in http://www.fontsquirrel.com/fontface
-      // (e.g., Notice2Std.otf) have weird lsb values.
-      OTS_WARNING("bad lsb: %d < %d", sb, header->min_sb1);
-      sb = header->min_sb1;
-    }
-#endif
-
-    metrics->sbs.push_back(sb);
-  }
-
-  return true;
-}
-
-bool SerialiseMetricsTable(const ots::OpenTypeFile *file,
-                           OTSStream *out,
-                           const OpenTypeMetricsTable *metrics) {
-  for (unsigned i = 0; i < metrics->entries.size(); ++i) {
-    if (!out->WriteU16(metrics->entries[i].first) ||
-        !out->WriteS16(metrics->entries[i].second)) {
-      return OTS_FAILURE_MSG("Failed to write metric %d", i);
-    }
-  }
-
-  for (unsigned i = 0; i < metrics->sbs.size(); ++i) {
-    if (!out->WriteS16(metrics->sbs[i])) {
-      return OTS_FAILURE_MSG("Failed to write side bearing %ld", i + metrics->entries.size());
-    }
-  }
-
-  return true;
-}
-
-}  // namespace ots
-
-#undef TABLE_NAME