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-rw-r--r--gfx/ots/src/avar.cc164
1 files changed, 164 insertions, 0 deletions
diff --git a/gfx/ots/src/avar.cc b/gfx/ots/src/avar.cc
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+++ b/gfx/ots/src/avar.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 "avar.h"
+
+#include "fvar.h"
+
+#include "variations.h"
+
+namespace ots {
+
+// -----------------------------------------------------------------------------
+// OpenTypeAVAR
+// -----------------------------------------------------------------------------
+
+bool OpenTypeAVAR::Parse(const uint8_t* data, size_t length) {
+ Buffer table(data, length);
+ if (!table.ReadU16(&this->majorVersion) ||
+ !table.ReadU16(&this->minorVersion) ||
+ !table.ReadU16(&this->reserved) ||
+ !table.ReadU16(&this->axisCount)) {
+ return Drop("Failed to read table header");
+ }
+ if (this->majorVersion > 2) {
+ return Drop("Unknown table version");
+ }
+ if (this->majorVersion == 1) {
+ // We can fix table
+ if (this->minorVersion > 0) {
+ // we only know how to serialize version 1.0
+ Warning("Downgrading minor version to 0");
+ this->minorVersion = 0;
+ }
+ if (this->reserved != 0) {
+ Warning("Expected reserved=0");
+ this->reserved = 0;
+ }
+ } else {
+ // We serialize data unchanged, so drop even for minor errors
+ if (this->minorVersion > 0) {
+ return Drop("Unknown minor table version");
+ }
+ if (this->reserved != 0) {
+ return Drop("Expected reserved=0");
+ }
+ }
+
+ OpenTypeFVAR* fvar = static_cast<OpenTypeFVAR*>(
+ GetFont()->GetTypedTable(OTS_TAG_FVAR));
+ if (!fvar) {
+ return DropVariations("Required fvar table is missing");
+ }
+ if (axisCount != fvar->AxisCount()) {
+ return Drop("Axis count mismatch");
+ }
+
+ for (size_t i = 0; i < this->axisCount; i++) {
+ this->axisSegmentMaps.emplace_back();
+ uint16_t positionMapCount;
+ if (!table.ReadU16(&positionMapCount)) {
+ return Drop("Failed to read position map count");
+ }
+ int foundRequiredMappings = 0;
+ for (size_t j = 0; j < positionMapCount; j++) {
+ AxisValueMap map;
+ if (!table.ReadS16(&map.fromCoordinate) ||
+ !table.ReadS16(&map.toCoordinate)) {
+ return Drop("Failed to read axis value map");
+ }
+ if (map.fromCoordinate < -0x4000 ||
+ map.fromCoordinate > 0x4000 ||
+ map.toCoordinate < -0x4000 ||
+ map.toCoordinate > 0x4000) {
+ return Drop("Axis value map coordinate out of range");
+ }
+ if (j > 0) {
+ if (map.fromCoordinate <= this->axisSegmentMaps[i].back().fromCoordinate ||
+ map.toCoordinate < this->axisSegmentMaps[i].back().toCoordinate) {
+ return Drop("Axis value map out of order");
+ }
+ }
+ if ((map.fromCoordinate == -0x4000 && map.toCoordinate == -0x4000) ||
+ (map.fromCoordinate == 0 && map.toCoordinate == 0) ||
+ (map.fromCoordinate == 0x4000 && map.toCoordinate == 0x4000)) {
+ ++foundRequiredMappings;
+ }
+ this->axisSegmentMaps[i].push_back(map);
+ }
+ if (positionMapCount > 0 && foundRequiredMappings != 3) {
+ return Drop("A required mapping (for -1, 0 or 1) is missing");
+ }
+ }
+
+ if (this->majorVersion < 2)
+ return true;
+
+ uint32_t axisIndexMapOffset;
+ uint32_t varStoreOffset;
+
+ if (!table.ReadU32(&axisIndexMapOffset) ||
+ !table.ReadU32(&varStoreOffset)) {
+ return Drop("Failed to read version 2 offsets");
+ }
+
+ Font *font = GetFont();
+ uint32_t headerSize = table.offset();
+
+ if (axisIndexMapOffset) {
+ if (axisIndexMapOffset < headerSize || axisIndexMapOffset >= length) {
+ return Drop("Bad delta set index offset in table header");
+ }
+ if (!ParseDeltaSetIndexMap(font, data + axisIndexMapOffset, length - axisIndexMapOffset)) {
+ return Drop("Failed to parse delta set index map");
+ }
+ }
+
+ if (varStoreOffset) {
+ if (varStoreOffset < headerSize || varStoreOffset >= length) {
+ return Drop("Bad item variation store offset in table header");
+ }
+ if (!ParseItemVariationStore(font, data + varStoreOffset, length - varStoreOffset)) {
+ return Drop("Failed to parse item variation store");
+ }
+ }
+
+ this->m_data = data;
+ this->m_length = length;
+
+ return true;
+}
+
+bool OpenTypeAVAR::Serialize(OTSStream* out) {
+ if (this->majorVersion >= 2) {
+ if (!out->Write(this->m_data, this->m_length)) {
+ return Error("Failed to write table");
+ }
+ return true;
+ }
+
+ if (!out->WriteU16(this->majorVersion) ||
+ !out->WriteU16(this->minorVersion) ||
+ !out->WriteU16(this->reserved) ||
+ !out->WriteU16(this->axisCount)) {
+ return Error("Failed to write table");
+ }
+
+ for (size_t i = 0; i < this->axisCount; i++) {
+ const auto& axisValueMap = this->axisSegmentMaps[i];
+ if (!out->WriteU16(axisValueMap.size())) {
+ return Error("Failed to write table");
+ }
+ for (size_t j = 0; j < axisValueMap.size(); j++) {
+ if (!out->WriteS16(axisValueMap[j].fromCoordinate) ||
+ !out->WriteS16(axisValueMap[j].toCoordinate)) {
+ return Error("Failed to write table");
+ }
+ }
+ }
+
+ return true;
+}
+
+} // namespace ots