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-rw-r--r--gfx/ots/src/hvar.cc85
1 files changed, 85 insertions, 0 deletions
diff --git a/gfx/ots/src/hvar.cc b/gfx/ots/src/hvar.cc
new file mode 100644
index 0000000000..2bcea86803
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+++ b/gfx/ots/src/hvar.cc
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+// Copyright (c) 2018 The OTS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "hvar.h"
+
+#include "variations.h"
+
+namespace ots {
+
+// -----------------------------------------------------------------------------
+// OpenTypeHVAR
+// -----------------------------------------------------------------------------
+
+bool OpenTypeHVAR::Parse(const uint8_t* data, size_t length) {
+ Buffer table(data, length);
+
+ uint16_t majorVersion;
+ uint16_t minorVersion;
+ uint32_t itemVariationStoreOffset;
+ uint32_t advanceWidthMappingOffset;
+ uint32_t lsbMappingOffset;
+ uint32_t rsbMappingOffset;
+
+ if (!table.ReadU16(&majorVersion) ||
+ !table.ReadU16(&minorVersion) ||
+ !table.ReadU32(&itemVariationStoreOffset) ||
+ !table.ReadU32(&advanceWidthMappingOffset) ||
+ !table.ReadU32(&lsbMappingOffset) ||
+ !table.ReadU32(&rsbMappingOffset)) {
+ return DropVariations("Failed to read table header");
+ }
+
+ if (majorVersion != 1) {
+ return DropVariations("Unknown table version");
+ }
+
+ if (itemVariationStoreOffset > length ||
+ advanceWidthMappingOffset > length ||
+ lsbMappingOffset > length ||
+ rsbMappingOffset > length) {
+ return DropVariations("Invalid subtable offset");
+ }
+
+ if (!ParseItemVariationStore(GetFont(), data + itemVariationStoreOffset,
+ length - itemVariationStoreOffset)) {
+ return DropVariations("Failed to parse item variation store");
+ }
+
+ if (advanceWidthMappingOffset) {
+ if (!ParseDeltaSetIndexMap(GetFont(), data + advanceWidthMappingOffset,
+ length - advanceWidthMappingOffset)) {
+ return DropVariations("Failed to parse advance width mappings");
+ }
+ }
+
+ if (lsbMappingOffset) {
+ if (!ParseDeltaSetIndexMap(GetFont(), data + lsbMappingOffset,
+ length - lsbMappingOffset)) {
+ return DropVariations("Failed to parse LSB mappings");
+ }
+ }
+
+ if (rsbMappingOffset) {
+ if (!ParseDeltaSetIndexMap(GetFont(), data + rsbMappingOffset,
+ length - rsbMappingOffset)) {
+ return DropVariations("Failed to parse RSB mappings");
+ }
+ }
+
+ this->m_data = data;
+ this->m_length = length;
+
+ return true;
+}
+
+bool OpenTypeHVAR::Serialize(OTSStream* out) {
+ if (!out->Write(this->m_data, this->m_length)) {
+ return Error("Failed to write HVAR table");
+ }
+
+ return true;
+}
+
+} // namespace ots