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-rw-r--r--gfx/ots/src/fvar.cc164
1 files changed, 164 insertions, 0 deletions
diff --git a/gfx/ots/src/fvar.cc b/gfx/ots/src/fvar.cc
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index 0000000000..6f9b4d6ebf
--- /dev/null
+++ b/gfx/ots/src/fvar.cc
@@ -0,0 +1,164 @@
+// 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 "fvar.h"
+
+namespace ots {
+
+// -----------------------------------------------------------------------------
+// OpenTypeFVAR
+// -----------------------------------------------------------------------------
+
+bool OpenTypeFVAR::Parse(const uint8_t* data, size_t length) {
+ Buffer table(data, length);
+ if (!table.ReadU16(&this->majorVersion) ||
+ !table.ReadU16(&this->minorVersion) ||
+ !table.ReadU16(&this->axesArrayOffset) ||
+ !table.ReadU16(&this->reserved) ||
+ !table.ReadU16(&this->axisCount) ||
+ !table.ReadU16(&this->axisSize) ||
+ !table.ReadU16(&this->instanceCount) ||
+ !table.ReadU16(&this->instanceSize)) {
+ return DropVariations("Failed to read table header");
+ }
+ if (this->majorVersion != 1) {
+ return DropVariations("Unknown table version");
+ }
+ if (this->minorVersion > 0) {
+ Warning("Downgrading minor version to 0");
+ this->minorVersion = 0;
+ }
+ if (this->axesArrayOffset > length || this->axesArrayOffset < table.offset()) {
+ return DropVariations("Bad axesArrayOffset");
+ }
+ if (this->reserved != 2) {
+ Warning("Expected reserved=2");
+ this->reserved = 2;
+ }
+ if (this->axisCount == 0) {
+ return DropVariations("No variation axes");
+ }
+ if (this->axisSize != 20) {
+ return DropVariations("Invalid axisSize");
+ }
+ // instanceCount is not validated
+ if (this->instanceSize == this->axisCount * sizeof(Fixed) + 6) {
+ this->instancesHavePostScriptNameID = true;
+ } else if (this->instanceSize == this->axisCount * sizeof(Fixed) + 4) {
+ this->instancesHavePostScriptNameID = false;
+ } else {
+ return DropVariations("Invalid instanceSize");
+ }
+
+ // When we serialize, the axes array will go here, even if it was
+ // originally at a different offset. So we update the axesArrayOffset
+ // field for the header.
+ uint32_t origAxesArrayOffset = this->axesArrayOffset;
+ this->axesArrayOffset = table.offset();
+
+ table.set_offset(origAxesArrayOffset);
+ for (unsigned i = 0; i < this->axisCount; i++) {
+ this->axes.emplace_back();
+ auto& axis = this->axes[i];
+ if (!table.ReadU32(&axis.axisTag) ||
+ !table.ReadS32(&axis.minValue) ||
+ !table.ReadS32(&axis.defaultValue) ||
+ !table.ReadS32(&axis.maxValue) ||
+ !table.ReadU16(&axis.flags) ||
+ !table.ReadU16(&axis.axisNameID)) {
+ return DropVariations("Failed to read axis record");
+ }
+ if (!CheckTag(axis.axisTag)) {
+ return DropVariations("Bad axis tag");
+ }
+ if (!(axis.minValue <= axis.defaultValue && axis.defaultValue <= axis.maxValue)) {
+ return DropVariations("Bad axis value range");
+ }
+ if ((axis.flags & 0xFFFEu) != 0) {
+ Warning("Discarding unknown axis flags");
+ axis.flags &= ~0xFFFEu;
+ }
+ if (axis.axisNameID <= 255 || axis.axisNameID >= 32768) {
+ Warning("Axis nameID out of range");
+ // We don't check that the name actually exists -- assume the client can handle
+ // a missing name when it tries to read the table.
+ }
+ }
+
+ for (unsigned i = 0; i < this->instanceCount; i++) {
+ this->instances.emplace_back();
+ auto& inst = this->instances[i];
+ if (!table.ReadU16(&inst.subfamilyNameID) ||
+ !table.ReadU16(&inst.flags)) {
+ return DropVariations("Failed to read instance record");
+ }
+ inst.coordinates.reserve(this->axisCount);
+ for (unsigned j = 0; j < this->axisCount; j++) {
+ inst.coordinates.emplace_back();
+ auto& coord = inst.coordinates[j];
+ if (!table.ReadS32(&coord)) {
+ return DropVariations("Failed to read instance coordinates");
+ }
+ }
+ if (this->instancesHavePostScriptNameID) {
+ if (!table.ReadU16(&inst.postScriptNameID)) {
+ return DropVariations("Failed to read instance psname ID");
+ }
+ }
+ }
+
+ if (table.remaining()) {
+ return Warning("%zu bytes unparsed", table.remaining());
+ }
+
+ return true;
+}
+
+bool OpenTypeFVAR::Serialize(OTSStream* out) {
+ if (!out->WriteU16(this->majorVersion) ||
+ !out->WriteU16(this->minorVersion) ||
+ !out->WriteU16(this->axesArrayOffset) ||
+ !out->WriteU16(this->reserved) ||
+ !out->WriteU16(this->axisCount) ||
+ !out->WriteU16(this->axisSize) ||
+ !out->WriteU16(this->instanceCount) ||
+ !out->WriteU16(this->instanceSize)) {
+ return Error("Failed to write table");
+ }
+
+ for (unsigned i = 0; i < this->axisCount; i++) {
+ const auto& axis = this->axes[i];
+ if (!out->WriteU32(axis.axisTag) ||
+ !out->WriteS32(axis.minValue) ||
+ !out->WriteS32(axis.defaultValue) ||
+ !out->WriteS32(axis.maxValue) ||
+ !out->WriteU16(axis.flags) ||
+ !out->WriteU16(axis.axisNameID)) {
+ return Error("Failed to write table");
+ }
+ }
+
+ for (unsigned i = 0; i < this->instanceCount; i++) {
+ const auto& inst = this->instances[i];
+ if (!out->WriteU16(inst.subfamilyNameID) ||
+ !out->WriteU16(inst.flags)) {
+ return Error("Failed to write table");
+ }
+ for (unsigned j = 0; j < this->axisCount; j++) {
+ const auto& coord = inst.coordinates[j];
+ if (!out->WriteS32(coord)) {
+ return Error("Failed to write table");
+ }
+ }
+ if (this->instancesHavePostScriptNameID) {
+ if (!out->WriteU16(inst.postScriptNameID)) {
+ return Error("Failed to write table");
+ }
+ }
+ }
+
+ return true;
+}
+
+} // namespace ots