v0.7.0

This release is funded by NLNet!

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New

• Encode support with interlacing for all bit depths and color types

• Progressive image encoding API

• Adaptive filtering, custom filter selection

• Chunk write support for all standard chunks including oFFs and eXIf extensions

• Added functions for configuring the encoder, decoder: spng_set_option(), spng_get_option()

• Added options to configure zlib, chunk count limit and handling of unknown chunks

• Added spng_get_gama_int(), spng_set_gama_int(), spng_decode_chunks()

• Read and write support for unknown chunks

Decoder

• Filter- and palette expansions optimizations using ARM NEON intrinsics, improved decode performance for common use cases:

• ~30% faster with true color and 19% faster with indexed color images (details)

• NEON optimizations are enabled by default on ARM64

Changes

• Unknown chunks are now ignored by default, this can be configured with spng_set_option()

• Introduced a default chunk count limit of 1000, this is independent of other limits

Changes - v0.7.0-rc3

• Encoder no longer writes to an internal buffer by default, the SPNG_ENCODE_TO_BUFFER option must be set

Fixes

• bKGD, tRNS chunk high bits are now preserved

• Force cdecl calling convention for allocator callbacks on Windows (@danielkrupinski)

Improved

• Expanded testsuite to verify chunk data, encoding of PNG's against libpng

• Expanded documentation, added libpng migration guide