third_party/ots/src/hmtx.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 "hmtx.h"
   6
   7 #include "hhea.h"
   8 #include "maxp.h"
   9
  10 // hmtx - Horizontal Metrics
  11 // http://www.microsoft.com/typography/otspec/hmtx.htm
  12
  13 #define TABLE_NAME "hmtx"
  14
  15 namespace ots {
  16
  17 bool ots_hmtx_parse(Font *font, const uint8_t *data, size_t length) {
  18   Buffer table(data, length);
  19   OpenTypeHMTX *hmtx = new OpenTypeHMTX;
  20   font->hmtx = hmtx;
  21
  22   if (!font->hhea || !font->maxp) {
  23     return OTS_FAILURE_MSG("Missing hhea or maxp tables in font, needed by hmtx");
  24   }
  25
  26   if (!ParseMetricsTable(font, &table, font->maxp->num_glyphs,
  27                          &font->hhea->header, &hmtx->metrics)) {
  28     return OTS_FAILURE_MSG("Failed to parse hmtx metrics");
  29   }
  30
  31   return true;
  32 }
  33
  34 bool ots_hmtx_should_serialise(Font *font) {
  35   return font->hmtx != NULL;
  36 }
  37
  38 bool ots_hmtx_serialise(OTSStream *out, Font *font) {
  39   if (!SerialiseMetricsTable(font, out, &font->hmtx->metrics)) {
  40     return OTS_FAILURE_MSG("Failed to serialise htmx metrics");
  41   }
  42   return true;
  43 }
  44
  45 void ots_hmtx_reuse(Font *font, Font *other) {
  46   font->hmtx = other->hmtx;
  47   font->hmtx_reused = true;
  48 }
  49
  50 void ots_hmtx_free(Font *font) {
  51   delete font->hmtx;
  52 }
  53
  54 }  // namespace ots
  55
  56 #undef TABLE_NAME