third_party/ots/src/fpgm.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 "fpgm.h"
   6
   7 // fpgm - Font Program
   8 // http://www.microsoft.com/typography/otspec/fpgm.htm
   9
  10 #define TABLE_NAME "fpgm"
  11
  12 namespace ots {
  13
  14 bool ots_fpgm_parse(Font *font, const uint8_t *data, size_t length) {
  15   Buffer table(data, length);
  16
  17   OpenTypeFPGM *fpgm = new OpenTypeFPGM;
  18   font->fpgm = fpgm;
  19
  20   if (length >= 128 * 1024u) {
  21     return OTS_FAILURE_MSG("length (%ld) > 120", length);  // almost all fpgm tables are less than 5k bytes.
  22   }
  23
  24   if (!table.Skip(length)) {
  25     return OTS_FAILURE_MSG("Bad fpgm length");
  26   }
  27
  28   fpgm->data = data;
  29   fpgm->length = length;
  30   return true;
  31 }
  32
  33 bool ots_fpgm_should_serialise(Font *font) {
  34   if (!font->glyf) return false;  // this table is not for CFF fonts.
  35   return font->fpgm != NULL;
  36 }
  37
  38 bool ots_fpgm_serialise(OTSStream *out, Font *font) {
  39   const OpenTypeFPGM *fpgm = font->fpgm;
  40
  41   if (!out->Write(fpgm->data, fpgm->length)) {
  42     return OTS_FAILURE_MSG("Failed to write fpgm");
  43   }
  44
  45   return true;
  46 }
  47
  48 void ots_fpgm_reuse(Font *font, Font *other) {
  49   font->fpgm = other->fpgm;
  50   font->fpgm_reused = true;
  51 }
  52
  53 void ots_fpgm_free(Font *font) {
  54   delete font->fpgm;
  55 }
  56
  57 }  // namespace ots
  58
  59 #undef TABLE_NAME