gfx/ots/src/cvar.cc

   1 // Copyright (c) 2018 The OTS 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 "cvar.h"
   6
   7 #include "fvar.h"
   8 #include "variations.h"
   9
  10 namespace ots {
  11
  12 // -----------------------------------------------------------------------------
  13 // OpenTypeCVAR
  14 // -----------------------------------------------------------------------------
  15
  16 bool OpenTypeCVAR::Parse(const uint8_t* data, size_t length) {
  17   Buffer table(data, length);
  18
  19   uint16_t majorVersion;
  20   uint16_t minorVersion;
  21
  22   if (!table.ReadU16(&majorVersion) ||
  23       !table.ReadU16(&minorVersion)) {
  24     return Drop("Failed to read table header");
  25   }
  26
  27   if (majorVersion != 1) {
  28     return Drop("Unknown table version");
  29   }
  30
  31   OpenTypeFVAR* fvar = static_cast<OpenTypeFVAR*>(
  32       GetFont()->GetTypedTable(OTS_TAG_FVAR));
  33   if (!fvar) {
  34     return DropVariations("Required fvar table is missing");
  35   }
  36
  37   if (!ParseVariationData(GetFont(), data + table.offset(), length - table.offset(),
  38                           fvar->AxisCount(), 0)) {
  39     return Drop("Failed to parse variation data");
  40   }
  41
  42   this->m_data = data;
  43   this->m_length = length;
  44
  45   return true;
  46 }
  47
  48 bool OpenTypeCVAR::Serialize(OTSStream* out) {
  49   if (!out->Write(this->m_data, this->m_length)) {
  50     return Error("Failed to write cvar table");
  51   }
  52
  53   return true;
  54 }
  55
  56 }  // namespace ots