1 files changed, 118 insertions, 0 deletions
diff --git a/extern/draco/draco/src/draco/compression/attributes/sequential_attribute_decoder.cc b/extern/draco/draco/src/draco/compression/attributes/sequential_attribute_decoder.cc
new file mode 100644
index 00000000000..b4ba24f2d31
--- /dev/null
+++ b/extern/draco/draco/src/draco/compression/attributes/sequential_attribute_decoder.cc
@@ -0,0 +1,118 @@
+// 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_decoder.h"
+
+namespace draco {
+
+SequentialAttributeDecoder::SequentialAttributeDecoder()
+    : decoder_(nullptr), attribute_(nullptr), attribute_id_(-1) {}
+
+bool SequentialAttributeDecoder::Init(PointCloudDecoder *decoder,
+                                      int attribute_id) {
+  decoder_ = decoder;
+  attribute_ = decoder->point_cloud()->attribute(attribute_id);
+  attribute_id_ = attribute_id;
+  return true;
+}
+
+bool SequentialAttributeDecoder::InitializeStandalone(
+    PointAttribute *attribute) {
+  attribute_ = attribute;
+  attribute_id_ = -1;
+  return true;
+}
+
+bool SequentialAttributeDecoder::DecodePortableAttribute(
+    const std::vector<PointIndex> &point_ids, DecoderBuffer *in_buffer) {
+  if (attribute_->num_components() <= 0 ||
+      !attribute_->Reset(point_ids.size())) {
+    return false;
+  }
+  if (!DecodeValues(point_ids, in_buffer)) {
+    return false;
+  }
+  return true;
+}
+
+bool SequentialAttributeDecoder::DecodeDataNeededByPortableTransform(
+    const std::vector<PointIndex> &point_ids, DecoderBuffer *in_buffer) {
+  // Default implementation does not apply any transform.
+  return true;
+}
+
+bool SequentialAttributeDecoder::TransformAttributeToOriginalFormat(
+    const std::vector<PointIndex> &point_ids) {
+  // Default implementation does not apply any transform.
+  return true;
+}
+
+const PointAttribute *SequentialAttributeDecoder::GetPortableAttribute() {
+  // If needed, copy point to attribute value index mapping from the final
+  // attribute to the portable attribute.
+  if (!attribute_->is_mapping_identity() && portable_attribute_ &&
+      portable_attribute_->is_mapping_identity()) {
+    portable_attribute_->SetExplicitMapping(attribute_->indices_map_size());
+    for (PointIndex i(0);
+         i < static_cast<uint32_t>(attribute_->indices_map_size()); ++i) {
+      portable_attribute_->SetPointMapEntry(i, attribute_->mapped_index(i));
+    }
+  }
+  return portable_attribute_.get();
+}
+
+bool SequentialAttributeDecoder::InitPredictionScheme(
+    PredictionSchemeInterface *ps) {
+  for (int i = 0; i < ps->GetNumParentAttributes(); ++i) {
+    const int att_id = decoder_->point_cloud()->GetNamedAttributeId(
+        ps->GetParentAttributeType(i));
+    if (att_id == -1) {
+      return false;  // Requested attribute does not exist.
+    }
+#ifdef DRACO_BACKWARDS_COMPATIBILITY_SUPPORTED
+    if (decoder_->bitstream_version() < DRACO_BITSTREAM_VERSION(2, 0)) {
+      if (!ps->SetParentAttribute(decoder_->point_cloud()->attribute(att_id))) {
+        return false;
+      }
+    } else
+#endif
+    {
+      const PointAttribute *const pa = decoder_->GetPortableAttribute(att_id);
+      if (pa == nullptr || !ps->SetParentAttribute(pa)) {
+        return false;
+      }
+    }
+  }
+  return true;
+}
+
+bool SequentialAttributeDecoder::DecodeValues(
+    const std::vector<PointIndex> &point_ids, DecoderBuffer *in_buffer) {
+  const int32_t num_values = static_cast<uint32_t>(point_ids.size());
+  const int entry_size = static_cast<int>(attribute_->byte_stride());
+  std::unique_ptr<uint8_t[]> value_data_ptr(new uint8_t[entry_size]);
+  uint8_t *const value_data = value_data_ptr.get();
+  int out_byte_pos = 0;
+  // Decode raw attribute values in their original format.
+  for (int i = 0; i < num_values; ++i) {
+    if (!in_buffer->Decode(value_data, entry_size)) {
+      return false;
+    }
+    attribute_->buffer()->Write(out_byte_pos, value_data, entry_size);
+    out_byte_pos += entry_size;
+  }
+  return true;
+}
+
+}  // namespace draco