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v0.14.1

Features:

  • Added Frame::from_grayscale_with_alpha to efficiently generate a palette for LumaA pixels.
  • Added Decoder::current_frame_info to re-query the next_frame_info without advancing the frame.

Enhancements:

  • The palette for Frame::from_rgba_speed now handles multiple transparent colors, i.e. non-premultiplied alpha, by normalizing fully transparent pixels to one transparent entry. This leads to a better distributed palette.

v0.14.0

  • EncodingError and DecodingError are now #[non_exhaustive]
  • Modified several error paths to return a new variant of EncodingError instead of boxing them into an io::Error, several return Result types are adjusted accordingly.
  • The Decoded enum no longer communicates data from decoded sub-blocks such as the repetition count. It now only contains the meta information on framing and extension data. This ensures we are yielding less often for performance.
  • last_ext was renamed to last_extension_sub_block for clarity.
  • The Decoder will now collect XMP and ICC metadata subblocks, making them available after decoding.

v0.13.3

  • Fix interpretation of LZW stream when multiple intermediate reset codes are used.
  • Allow extension blocks of unknown type with the allow_unknown_blocks option.

v0.13.2

  • Simplified internal decoder size

v0.13.1

Bugfixes:

  • Fixed writing palettes with non-power-of-two sizes

v0.13.0

Features:

  • Added Iterator interface for the Decoder
  • Added reading number of loop repetitions Decoder::repeat.
  • Added skip_frame_decoding option to read Frame.buffer as LZW data. It works together with write_lzw_pre_encoded_frame for quick rewriting of GIF files.
  • Added support pre-allocated Vecs in from_palette_pixels
  • Added ability to recover the io::Reader after decoding.
  • Added support for decompressing Frame.buffer with LZW data, which enables fully parallel GIF re-encoding (see examples/parallel.rs),

Optimization:

  • Less buffering, copying, and lower peak memory usage.

Other changes:

  • Removed unsafe {} code.
  • Enforced memory limit also on metadata extension blocks, and added out-of-memory checks where possible.
  • EncodingFormatError enum is public.
  • Removed defunct skip_extensions
  • Added validation of frame dimensions. The buffer must be large enough for all pixels, and if the width or height is 0, the buffer must be empty.

v0.12.0

Features:

  • Add compression of pre-compressed frame data, via Encoder::write_lzw_pre_encoded_frame.
  • The color_quant dependency is now optional. Turning it off disables some interfaces that would internally build quantization tables. The generic implementation of creating such tables can be prohibitively costly compared to specialized algorithms in some use cases.

Optimization:

  • Avoid some allocations in by replacing flat_map argument with arrays

v0.11.4

Bufixes:

  • Fix decoding confusing superfluous image data from previous frames with current frame data.
  • Bump minimum required version of weezl.

Features:

  • Add Encoder::{get_ref, get_mut, into_inner} to access underlying stream.

v0.11.3

Bugfixes:

  • Fix panic while decoding some images, has no precise cause in the file.
  • Warn about set_extensions being unimplemented...

Features:

  • Added StreamingDecoder::version to query the precise version of the standard used for encoding the file. This is merely a hint.
  • Added DecodeOptions::allow_unknown_blocks to skip over unknown or unspecified block kinds.

Optimization:

  • Frame::from_rgba now recognizes when less than 256 colors are being used, dynamically skipping the quantization phase.
  • Encoding image chunks is faster and simpler

v0.11.2

  • Fix panic when LZW code size is invalid
  • Added option to omit check for lzw end code

v0.11.1

  • Frames out-of-bounds of the screen descriptor are again accepted by default.
  • Added DecodeOptions::check_frame_consistency to turn this validation on.

v0.11

  • Rename Reader to Decoder.
  • Reworked Decoder into DecodeOptions.
  • The decoding error is now opaque and no longer allocates a string. Adding more information or more error conditions is forward compatible.
  • Replace the lzw decoder with weezl, up to +350% throughput.
  • The dysfunctional C-API has been (temporarily?) removed
    • It may get reintroduced as a separate crate at some point
  • Added a std feature. It must be active for now.