third_party/ots/src/vmtx.cc

   1 // Copyright (c) 2011 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 "vmtx.h"
   6
   7 #include "gsub.h"
   8 #include "maxp.h"
   9 #include "vhea.h"
  10
  11 // vmtx - Vertical Metrics Table
  12 // http://www.microsoft.com/typography/otspec/vmtx.htm
  13
  14 #define TABLE_NAME "vmtx"
  15
  16 namespace ots {
  17
  18 bool ots_vmtx_parse(OpenTypeFile *file, const uint8_t *data, size_t length) {
  19   Buffer table(data, length);
  20   OpenTypeVMTX *vmtx = new OpenTypeVMTX;
  21   file->vmtx = vmtx;
  22
  23   if (!file->vhea || !file->maxp) {
  24     return OTS_FAILURE_MSG("vhea or maxp table missing as needed by vmtx");
  25   }
  26
  27   if (!ParseMetricsTable(file, &table, file->maxp->num_glyphs,
  28                          &file->vhea->header, &vmtx->metrics)) {
  29     return OTS_FAILURE_MSG("Failed to parse vmtx metrics");
  30   }
  31
  32   return true;
  33 }
  34
  35 bool ots_vmtx_should_serialise(OpenTypeFile *file) {
  36   // vmtx should serialise when vhea and GSUB are preserved.
  37   // See the comment in ots_vhea_should_serialise().
  38   return file->vmtx != NULL && file->vhea != NULL &&
  39       ots_gsub_should_serialise(file);
  40 }
  41
  42 bool ots_vmtx_serialise(OTSStream *out, OpenTypeFile *file) {
  43   if (!SerialiseMetricsTable(file, out, &file->vmtx->metrics)) {
  44     return OTS_FAILURE_MSG("Failed to write vmtx metrics");
  45   }
  46   return true;
  47 }
  48
  49 void ots_vmtx_free(OpenTypeFile *file) {
  50   delete file->vmtx;
  51 }
  52
  53 }  // namespace ots
  54
  55 #undef TABLE_NAME