mirror of
https://git.mirrors.martin98.com/https://github.com/google/draco
synced 2025-07-29 05:31:59 +08:00
73bb3c8530
- Improved compression for triangular meshes (~10%) - Added WebAssembly decoder - Code cleanup + robustness fixes
64 lines
2.5 KiB
C++
64 lines
2.5 KiB
C++
// 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 "compression/attributes/prediction_schemes/prediction_scheme_encoder_factory.h"
|
|
|
|
namespace draco {
|
|
|
|
PredictionSchemeMethod SelectPredictionMethod(
|
|
int att_id, const PointCloudEncoder *encoder) {
|
|
if (encoder->options()->GetSpeed() >= 10) {
|
|
return PREDICTION_NONE; // No prediction when the fastest speed is
|
|
// requested.
|
|
}
|
|
if (encoder->GetGeometryType() == TRIANGULAR_MESH) {
|
|
// Use speed setting to select the best encoding method.
|
|
const PointAttribute *const att = encoder->point_cloud()->attribute(att_id);
|
|
if (att->attribute_type() == GeometryAttribute::TEX_COORD) {
|
|
if (encoder->options()->GetSpeed() < 4) {
|
|
// Use texture coordinate prediction for speeds 0, 1, 2, 3.
|
|
return MESH_PREDICTION_TEX_COORDS;
|
|
}
|
|
}
|
|
// Handle other attribute types.
|
|
if (encoder->options()->GetSpeed() >= 8) {
|
|
return PREDICTION_DIFFERENCE;
|
|
}
|
|
if (encoder->options()->GetSpeed() >= 2 ||
|
|
encoder->point_cloud()->num_points() < 40) {
|
|
// Parallelogram prediction is used for speeds 2 - 7 or when the overhead
|
|
// of using constrained multi parallelogram would be too high.
|
|
return MESH_PREDICTION_PARALLELOGRAM;
|
|
}
|
|
// Multi-parallelogram is used for speeds 0, 1.
|
|
return MESH_PREDICTION_CONSTRAINED_MULTI_PARALLELOGRAM;
|
|
}
|
|
// Default option is delta coding.
|
|
return PREDICTION_DIFFERENCE;
|
|
}
|
|
|
|
// Returns the preferred prediction scheme based on the encoder options.
|
|
PredictionSchemeMethod GetPredictionMethodFromOptions(
|
|
int att_id, const EncoderOptions &options) {
|
|
const int pred_type =
|
|
options.GetAttributeInt(att_id, "prediction_scheme", -1);
|
|
if (pred_type == -1)
|
|
return PREDICTION_UNDEFINED;
|
|
if (pred_type < 0 || pred_type >= NUM_PREDICTION_SCHEMES)
|
|
return PREDICTION_NONE;
|
|
return static_cast<PredictionSchemeMethod>(pred_type);
|
|
}
|
|
|
|
} // namespace draco
|