1 files changed, 108 insertions, 0 deletions
diff --git a/extern/draco/draco/src/draco/compression/attributes/sequential_attribute_encoder.cc b/extern/draco/draco/src/draco/compression/attributes/sequential_attribute_encoder.cc
new file mode 100644
index 00000000000..6bde3eeb3ba
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+++ b/extern/draco/draco/src/draco/compression/attributes/sequential_attribute_encoder.cc
@@ -0,0 +1,108 @@
+// Copyright 2016 The Draco Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+#include "draco/compression/attributes/sequential_attribute_encoder.h"
+
+namespace draco {
+
+SequentialAttributeEncoder::SequentialAttributeEncoder()
+    : encoder_(nullptr),
+      attribute_(nullptr),
+      attribute_id_(-1),
+      is_parent_encoder_(false) {}
+
+bool SequentialAttributeEncoder::Init(PointCloudEncoder *encoder,
+                                      int attribute_id) {
+  encoder_ = encoder;
+  attribute_ = encoder_->point_cloud()->attribute(attribute_id);
+  attribute_id_ = attribute_id;
+  return true;
+}
+
+bool SequentialAttributeEncoder::InitializeStandalone(
+    PointAttribute *attribute) {
+  attribute_ = attribute;
+  attribute_id_ = -1;
+  return true;
+}
+
+bool SequentialAttributeEncoder::TransformAttributeToPortableFormat(
+    const std::vector<PointIndex> &point_ids) {
+  // Default implementation doesn't transform the input data.
+  return true;
+}
+
+bool SequentialAttributeEncoder::EncodePortableAttribute(
+    const std::vector<PointIndex> &point_ids, EncoderBuffer *out_buffer) {
+  // Lossless encoding of the input values.
+  if (!EncodeValues(point_ids, out_buffer)) {
+    return false;
+  }
+  return true;
+}
+
+bool SequentialAttributeEncoder::EncodeDataNeededByPortableTransform(
+    EncoderBuffer *out_buffer) {
+  // Default implementation doesn't transform the input data.
+  return true;
+}
+
+bool SequentialAttributeEncoder::EncodeValues(
+    const std::vector<PointIndex> &point_ids, EncoderBuffer *out_buffer) {
+  const int entry_size = static_cast<int>(attribute_->byte_stride());
+  const std::unique_ptr<uint8_t[]> value_data_ptr(new uint8_t[entry_size]);
+  uint8_t *const value_data = value_data_ptr.get();
+  // Encode all attribute values in their native raw format.
+  for (uint32_t i = 0; i < point_ids.size(); ++i) {
+    const AttributeValueIndex entry_id = attribute_->mapped_index(point_ids[i]);
+    attribute_->GetValue(entry_id, value_data);
+    out_buffer->Encode(value_data, entry_size);
+  }
+  return true;
+}
+
+void SequentialAttributeEncoder::MarkParentAttribute() {
+  is_parent_encoder_ = true;
+}
+
+bool SequentialAttributeEncoder::InitPredictionScheme(
+    PredictionSchemeInterface *ps) {
+  for (int i = 0; i < ps->GetNumParentAttributes(); ++i) {
+    const int att_id = encoder_->point_cloud()->GetNamedAttributeId(
+        ps->GetParentAttributeType(i));
+    if (att_id == -1) {
+      return false;  // Requested attribute does not exist.
+    }
+    parent_attributes_.push_back(att_id);
+    encoder_->MarkParentAttribute(att_id);
+  }
+  return true;
+}
+
+bool SequentialAttributeEncoder::SetPredictionSchemeParentAttributes(
+    PredictionSchemeInterface *ps) {
+  for (int i = 0; i < ps->GetNumParentAttributes(); ++i) {
+    const int att_id = encoder_->point_cloud()->GetNamedAttributeId(
+        ps->GetParentAttributeType(i));
+    if (att_id == -1) {
+      return false;  // Requested attribute does not exist.
+    }
+    if (!ps->SetParentAttribute(encoder_->GetPortableAttribute(att_id))) {
+      return false;
+    }
+  }
+  return true;
+}
+
+}  // namespace draco