symbol_bit_encoder.h

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#ifndef DRACO_COMPRESSION_BIT_CODERS_SYMBOL_BIT_ENCODER_H_
#define DRACO_COMPRESSION_BIT_CODERS_SYMBOL_BIT_ENCODER_H_
 
#include <algorithm>
#include <vector>
 
#include "draco/core/encoder_buffer.h"
 
namespace draco {
 
// Class for encoding bits using the symbol entropy encoding. Wraps
// |EncodeSymbols|. Note that this uses a symbol-based encoding scheme for
// encoding bits.
class SymbolBitEncoder {
 public:
  // Must be called before any Encode* function is called.
  void StartEncoding() { Clear(); }
 
  // Encode one bit. If |bit| is true encode a 1, otherwise encode a 0.
  void EncodeBit(bool bit) { EncodeLeastSignificantBits32(1, bit ? 1 : 0); }
 
  // Encode |nbits| LSBs of |value| as a symbol. |nbits| must be > 0 and <= 32.
  void EncodeLeastSignificantBits32(int nbits, uint32_t value);
 
  // Ends the bit encoding and stores the result into the target_buffer.
  void EndEncoding(EncoderBuffer *target_buffer);
 
 private:
  void Clear();
 
  std::vector<uint32_t> symbols_;
};
 
}  // namespace draco
 
#endif  // DRACO_COMPRESSION_BIT_CODERS_SYMBOL_BIT_ENCODER_H_