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Unigine::Compress Class

Header: #include <UnigineCompress.h>

Compress class is used to compress and decompress data using the following algorithms:

  • Jackalless — recommended. UNIGINE compression method optimized for compressing 2D and 3D textures. It provides better results than LZ4 and Zlib without deteriorating the quality.
  • LZ4 — temporary option, planned to be removed in the upcoming releases.
  • Zlib — for high compression ratio (can provide up to 2 times higher compression ratio, but takes up to 20 times longer).

Compress Class

Members


bool zlibCompress ( void* dest, size_t& dest_size, const void* src, size_t src_size, bool quality ) #

Compresses the source data using the Zlib algorithm with the specified compression level and puts the result to the specified destination.

Arguments

  • void* dest - Destination buffer pointer.
  • size_t& dest_size - Destination data size.
  • const void* src - Source buffer pointer.
  • size_t src_size - Source data size.
  • bool quality - Compression quality; false is for faster compression, true is for higher compression (less size).

Return value

true if the operation was successful; otherwise, false.

bool zlibDecompress ( void* dest, size_t dest_size, const void* src, size_t src_size ) #

Decompresses the source data using the Zlib algorithm and puts the result to the specified destination.

Arguments

  • void* dest - Destination buffer pointer.
  • size_t dest_size - Destination data size.
  • const void* src - Source buffer pointer.
  • size_t src_size - Source data size.

Return value

true if the operation was successful; otherwise, false.

size_t zlibSize ( size_t size ) #

Returns the maximum Zlib-compressed data size for the specified uncompressed size value.

Arguments

  • size_t size - Uncompressed data size.

Return value

Maximum Zlib-compressed data size.

size_t lz4Size ( size_t size ) #

Returns the maximum LZ4-compressed data size for the specified uncompressed size value.

Arguments

  • size_t size - Uncompressed data size.

Return value

Maximum lz4-compressed data size.

bool lz4Compress ( void* dest, size_t& dest_size, const void* src, size_t src_size, bool quality ) #

Compresses the source data using the LZ4 algorithm with the specified compression level and puts the result to the specified destination.

Arguments

  • void* dest - Destination buffer pointer.
  • size_t& dest_size - Destination data size.
  • const void* src - Source buffer pointer.
  • size_t src_size - Source data size.
  • bool quality - Compression quality; false is for faster compression, true is for higher compression (less size).

Return value

true if the operation was successful; otherwise, false.

bool lz4Decompress ( void* dest, size_t dest_size, const void* src, size_t src_size ) #

Decompresses the source data using the LZ4 algorithm and puts the result to the specified destination.

Arguments

  • void* dest - Destination buffer pointer.
  • size_t dest_size - Destination data size.
  • const void* src - Source buffer pointer.
  • size_t src_size - Source data size.

Return value

true if the operation was successful; otherwise, false.

size_t jackallessSize ( size_t size ) #

Returns the maximum size of data compressed using jackalless method for the specified uncompressed size value.

Arguments

  • size_t size - Uncompressed data size.

Return value

Maximum size of data compressed using jackalless method.

bool jackallessCompress ( void* dest, size_t& dest_size, const void* src, size_t src_size ) #

Compresses the source data using jackalless method and puts the result to the specified destination.

Arguments

  • void* dest - Destination buffer pointer.
  • size_t& dest_size - Destination data size.
  • const void* src - Source buffer pointer.
  • size_t src_size - Source data size.

Return value

true if the operation was successful; otherwise, false.

bool jackallessDecompress ( void* dest, const void* src ) #

Decompresses the source data using jackalless method and puts the result to the specified destination.

Arguments

  • void* dest - Destination buffer pointer.
  • const void* src - Source buffer pointer.

Return value

true if the operation was successful; otherwise, false.

bool jackallessCompressFloat ( void* dest, size_t& dest_size, const float* src, size_t src_length ) #

Compresses the source data using jackalless method and puts the result to the specified destination.

Arguments

  • void* dest - Destination buffer pointer.
  • size_t& dest_size - Destination data size.
  • const float* src - Source buffer pointer.
  • size_t src_length - Source data length.

Return value

true if the operation was successful; otherwise, false.

bool jackallessDecompressFloat ( float* dest, size_t dest_length, const void* src ) #

Decompresses the source data using jackalless method and puts the result to the specified destination.

Arguments

  • float* dest - Destination buffer pointer.
  • size_t dest_length - Destination data length.
  • const void* src - Source buffer pointer.

Return value

true if the operation was successful; otherwise, false.

size_t jackallessRawSize ( void* compressed_data ) #

Returns the raw size of the compressed data.

Arguments

  • void* compressed_data - Compressed data pointer.

Return value

Raw data size.

size_t jackallessCompressedSize ( void* compressed_data ) #

Returns the compressed size of the compressed data.

Arguments

  • void* compressed_data - Compressed data pointer.

Return value

Compressed data size.
Last update: 20.04.2022
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