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Warning! This version of documentation is OUTDATED, as it describes an older SDK version! Please switch to the documentation for the latest SDK version.
Warning! This version of documentation describes an old SDK version which is no longer supported! Please upgrade to the latest SDK version.

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, size_t& dest_size, const void* src ) #

Decompresses 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.

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: 2021-12-13
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