third_party/ots/src/hhea.cc

   1 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "hhea.h"
   6
   7 #include "head.h"
   8 #include "maxp.h"
   9
  10 // hhea - Horizontal Header
  11 // http://www.microsoft.com/typography/otspec/hhea.htm
  12
  13 #define TABLE_NAME "hhea"
  14
  15 namespace ots {
  16
  17 bool ots_hhea_parse(Font *font, const uint8_t *data, size_t length) {
  18   Buffer table(data, length);
  19   OpenTypeHHEA *hhea = new OpenTypeHHEA;
  20   font->hhea = hhea;
  21
  22   if (!table.ReadU32(&hhea->header.version)) {
  23     return OTS_FAILURE_MSG("Failed to read hhea version");
  24   }
  25   if (hhea->header.version >> 16 != 1) {
  26     return OTS_FAILURE_MSG("Bad hhea version of %d", hhea->header.version);
  27   }
  28
  29   if (!ParseMetricsHeader(font, &table, &hhea->header)) {
  30     return OTS_FAILURE_MSG("Failed to parse horizontal metrics");
  31   }
  32
  33   return true;
  34 }
  35
  36 bool ots_hhea_should_serialise(Font *font) {
  37   return font->hhea != NULL;
  38 }
  39
  40 bool ots_hhea_serialise(OTSStream *out, Font *font) {
  41   if (!SerialiseMetricsHeader(font, out, &font->hhea->header)) {
  42     return OTS_FAILURE_MSG("Failed to serialise horizontal metrics");
  43   }
  44   return true;
  45 }
  46
  47 void ots_hhea_reuse(Font *font, Font *other) {
  48   font->hhea = other->hhea;
  49   font->hhea_reused = true;
  50 }
  51
  52 void ots_hhea_free(Font *font) {
  53   delete font->hhea;
  54 }
  55
  56 }  // namespace ots
  57
  58 #undef TABLE_NAME