mirror of
https://git.mirrors.martin98.com/https://github.com/google/draco
synced 2025-06-22 12:15:39 +08:00
73bb3c8530
- Improved compression for triangular meshes (~10%) - Added WebAssembly decoder - Code cleanup + robustness fixes
77 lines
2.2 KiB
C++
77 lines
2.2 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.
|
|
//
|
|
// File provides direct encoding of bits with arithmetic encoder interface.
|
|
#ifndef DRACO_CORE_FOLDED_INTEGER_BIT_DECODER_H_
|
|
#define DRACO_CORE_FOLDED_INTEGER_BIT_DECODER_H_
|
|
|
|
#include <vector>
|
|
|
|
#include "core/decoder_buffer.h"
|
|
|
|
namespace draco {
|
|
|
|
// See FoldedBit32Encoder for more details.
|
|
template <class BitDecoderT>
|
|
class FoldedBit32Decoder {
|
|
public:
|
|
FoldedBit32Decoder() {}
|
|
~FoldedBit32Decoder() {}
|
|
|
|
// Sets |source_buffer| as the buffer to decode bits from.
|
|
bool StartDecoding(DecoderBuffer *source_buffer) {
|
|
for (int i = 0; i < 32; i++) {
|
|
if (!folded_number_decoders_[i].StartDecoding(source_buffer))
|
|
return false;
|
|
}
|
|
return bit_decoder_.StartDecoding(source_buffer);
|
|
}
|
|
|
|
// Decode one bit. Returns true if the bit is a 1, otherwise false.
|
|
bool DecodeNextBit() { return bit_decoder_.DecodeNextBit(); }
|
|
|
|
// Decode the next |nbits| and return the sequence in |value|. |nbits| must be
|
|
// > 0 and <= 32.
|
|
void DecodeLeastSignificantBits32(int nbits, uint32_t *value) {
|
|
uint32_t result = 0;
|
|
for (int i = 0; i < nbits; ++i) {
|
|
const bool bit = folded_number_decoders_[i].DecodeNextBit();
|
|
result = (result << 1) + bit;
|
|
}
|
|
*value = result;
|
|
}
|
|
|
|
void EndDecoding() {
|
|
for (int i = 0; i < 32; i++) {
|
|
folded_number_decoders_[i].EndDecoding();
|
|
}
|
|
bit_decoder_.EndDecoding();
|
|
}
|
|
|
|
private:
|
|
void Clear() {
|
|
for (int i = 0; i < 32; i++) {
|
|
folded_number_decoders_[i].Clear();
|
|
}
|
|
bit_decoder_.Clear();
|
|
}
|
|
|
|
std::array<BitDecoderT, 32> folded_number_decoders_;
|
|
BitDecoderT bit_decoder_;
|
|
};
|
|
|
|
} // namespace draco
|
|
|
|
#endif // DRACO_CORE_FOLDED_INTEGER_BIT_DECODER_H_
|