v0.7.4

Fixes

• CMake static build fixes - @coeps-github
• Added CMake package support - @johannesschaeufele
• Fix Meson build with clang-cl - @neheb
• Fix invalid decode error for zero-length EXIF chunks

v0.7.3

Fixes

• Fixed includes when used as CMake subproject (@benediktschmitt)
• Make finding zlib in-tree easier for CMake (@michaelmalonenz)
• Fixed Meson build under mingw32 (@neheb)
• Fixed -Wshadow warning (@Loobinex, @xtremeqg)
• Fixed references, typos in documentation (@ocpalo, @danieljennings, @timgates42)
• Other minor fixes and cleanup

Other

• Updated Meson zlib wrap to v1.2.13
• Removed debian subdirectory with outdated files

v0.7.2

Fixes

• Re-enabled ARM NEON optimizations for indexed color images
• Fixed encoder options set with spng_set_option() not being respected in some cases
• Fixed spng_get_png_buffer() not setting an error code in some cases
• Fixed encoder heap overflow with specially crafted images (#196)
• Fixed 4GB progressive decode/encode limitation on 32-bit (#198)
• Updated error string for SPNG_EBUFSIZ

New

• Decoder now exposes an estimate of image compression level through SPNG_IMG_COMPRESSION_LEVEL, see Decode options
• Added documentation for all decode and encode options, added notes on encoder configuration

Other

• Added encode fuzzer to ensure robustness of code;
  Fuzzer will run on PR's and continuously on OSS-Fuzz alongside the decode fuzzer
• Updated example code

v0.7.1

Fixes

• Fixed crash with ARM NEON optimization for indexed color images

v0.7.0

This release is funded by NLNet!

To support further development consider sponsoring the project on OpenCollective.

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

v0.7.0-rc3

This release is funded by NLNet!

This is a release candidate, the API may change for the stable release!

Share your feedback on the API here or on Gitter!

• Documentation

New

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

• Progressive image encoding

• Encode to a stream, file or buffer managed by the library

• Low overhead adaptive filtering, custom filter selection

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

• ARM NEON decoder optimizations (since v0.7.0-rc2)

• Added spng_get_png_buffer(), this function returns the encoded PNG buffer if no output stream or file is set.

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

• Added location field to struct spng_unknown_chunk, this specifies the relative location of the chunk (new since v0.7.0-rc1)

• Added spng_get_gama_int(), spng_set_gama_int()

• Added spng_encode_chunks()

Changes

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

Fixes

• bKGD, tRNS chunk high bits are now preserved

Improved

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

v0.7.0-rc2

This release is funded by NLNet!

This is a release candidate, the API may change for the stable release!

Share your feedback on the API here or on Gitter!

• Documentation

New

• 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)

• The new optimizations are enabled by default on ARM64

v0.7.0-rc1

This release is funded by NLNet!

This is a release candidate, the API may change for the stable release!

Share your feedback on the API here or on Gitter!

• Documentation

New

• Unknown chunk read support

Bugfixes

• Fixed spng_get_splt()

v0.6.3

This release is funded by NLNet!

Improved

• Improved decoder robustness, malformed images are less likely to cause a decoder error

• Expanded documentation on decoder error handling

• Expanded testsuite, code cleanups

• Fixed MSVC warnings

Upcoming features

The next minor release is v0.7.0 and will include:

• Unknown chunk support

• ARM NEON optimizations

• Encode support

v0.6.2

New

• The CRC action SPNG_CRC_DISCARD is now supported

Bugfixes

• Fixed handling of SPNG_CTX_IGNORE_ADLER32
• Introduced a workaround for a miniz bug that can lead to an infinite loop - #150
• Fixed spng_get_text/splt() not reading chunks before setting n_text/n_splt

Changes

• Dropped use of fmin() for DJGPP compatibility
• Dropped use of #warning in favor of #pragma message
• spng_get_<chunk>() functions will read chunks before checking all arguments

Changes to the default behavior were made for libpng compatibility:

• Changed the default CRC action for ancillary chunks from SPNG_CRC_ERROR to SPNG_CRC_DISCARD
• Setting SPNG_CRC_USE now also ignores checksums in DEFLATE streams
• Ancillary chunks with zlib data errors are discarded by default
• Ignore sBIT chunk length for truecolor alpha images - #130
• Ignore bKGD chunk length for truecolor (alpha) images - #156

Known issues

• Non-critical errors may still cause an image to not load - #132