- 4/2/2018: version 1.0.0

  This is a binary compatible release.

  * lossy encoder improvements to avoid chroma shifts in various circumstances

    (issues #308, #340)

  * big-endian fixes for decode, RGBA import and WebPPictureDistortion

  Tool updates:

    gifwebp, anim_diff - default duration behavior (<= 10ms) changed to match

                         web browsers, transcoding tools (issue #379)

    img2webp, webpmux - allow options to be passed in via a file (issue #355)

- 11/24/2017: version 0.6.1

  This is a binary compatible release.

  * lossless performance and compression improvements + a new 'cruncher' mode

    (-m 6 -q 100)

  * ARM performance improvements with clang (15-20% w/ndk r15c, issue #339)

  * webp-js: emscripten/webassembly based javascript decoder

  * miscellaneous bug & build fixes (issue #329, #332, #343, #353, #360, #361,

    #363)

  Tool updates / additions:

    added webpinfo - prints file format information (issue #330)

    gif2webp - loop behavior modified to match Chrome M63+ (crbug.com/649264);

               '-loop_compatibility' can be used for the old behavior

- 1/26/2017: version 0.6.0

  * lossless performance and compression improvements

  * miscellaneous performance improvements (SSE2, NEON, MSA)

  * webpmux gained a -duration option allowing for frame timing modification

  * new img2webp utility allowing a sequence of images to be converted to

    animated webp

  * API changes:

    - libwebp:

      WebPPictureSharpARGBToYUVA

      WebPPlaneDistortion

    - libwebpmux / gif2webp:

      WebPAnimEncoderOptions: kmax <= 0 now disables keyframes, kmax == 1

                              forces all keyframes. See mux.h and the gif2webp

                              manpage for details.

- 12/13/2016: version 0.5.2

  This is a binary compatible release.

  This release covers CVE-2016-8888 and CVE-2016-9085.

  * further security related hardening in the tools; fixes to

    gif2webp/AnimEncoder (issues #310, #314, #316, #322), cwebp/libwebp (issue

    #312)

  * full libwebp (encoder & decoder) iOS framework; libwebpdecoder

    WebP.framework renamed to WebPDecoder.framework (issue #307)

  * CMake support for Android Studio (2.2)

  * miscellaneous build related fixes (issue #306, #313)

  * miscellaneous documentation improvements (issue #225)

  * minor lossy encoder fixes and improvements

- 6/14/2016: version 0.5.1

  This is a binary compatible release.

  * miscellaneous bug fixes (issues #280, #289)

  * reverted alpha plane encoding with color cache for compatibility with

    libwebp 0.4.0->0.4.3 (issues #291, #298)

  * lossless encoding performance improvements

  * memory reduction in both lossless encoding and decoding

  * force mux output to be in the extended format (VP8X) when undefined chunks

    are present (issue #294)

  * gradle, cmake build support

  * workaround for compiler bug causing 64-bit decode failures on android

    devices using clang-3.8 in the r11c NDK

  * various WebPAnimEncoder improvements

- 12/17/2015: version 0.5.0

  * miscellaneous bug & build fixes (issues #234, #258, #274, #275, #278)

  * encoder & decoder speed-ups on x86/ARM/MIPS for lossy & lossless

    - note! YUV->RGB conversion was sped-up, but the results will be slightly

      different from previous releases

  * various lossless encoder improvements

  * gif2webp improvements, -min_size option added

  * tools fully support input from stdin and output to stdout (issue #168)

  * New WebPAnimEncoder API for creating animations

  * New WebPAnimDecoder API for decoding animations

  * other API changes:

    - libwebp:

      WebPPictureSmartARGBToYUVA() (-pre 4 in cwebp)

      WebPConfig::exact (-exact in cwebp; -alpha_cleanup is now the default)

      WebPConfig::near_lossless (-near_lossless in cwebp)

      WebPFree() (free'ing webp allocated memory in other languages)

      WebPConfigLosslessPreset()

      WebPMemoryWriterClear()

    - libwebpdemux: removed experimental fragment related fields and functions

    - libwebpmux: WebPMuxSetCanvasSize()

  * new libwebpextras library with some uncommon import functions:

    WebPImportGray/WebPImportRGB565/WebPImportRGB4444

- 10/15/15: version 0.4.4

  This is a binary compatible release.

  * rescaling out-of-bounds read fix (issue #254)

  * various build fixes and improvements (issues #253, #259, #262, #267, #268)

  * container documentation update

  * gif2webp transparency fix (issue #245)

- 3/3/15: version 0.4.3

  This is a binary compatible release.

  * Android / gcc / iOS / MSVS build fixes and improvements

  * lossless decode fix (issue #239 -- since 0.4.0)

  * documentation / vwebp updates for animation

  * multi-threading fix (issue #234)

- 10/13/14: version 0.4.2

  This is a binary compatible release.

  * Android / gcc build fixes

  * (Windows) fix reading from stdin and writing to stdout

  * gif2webp: miscellaneous fixes

  * fix 'alpha-leak' with lossy compression (issue #220)

  * the lossless bitstream spec has been amended to reflect the current code

- 7/24/14: version 0.4.1

  This is a binary compatible release.

  * AArch64 (arm64) & MIPS support/optimizations

  * NEON assembly additions:

    - ~25% faster lossy decode / encode (-m 4)

    - ~10% faster lossless decode

    - ~5-10% faster lossless encode (-m 3/4)

  * dwebp/vwebp can read from stdin

  * cwebp/gif2webp can write to stdout

  * cwebp can read webp files; useful if storing sources as webp lossless

- 12/19/13: version 0.4.0

  * improved gif2webp tool

  * numerous fixes, compression improvement and speed-up

  * dither option added to decoder (dwebp -dither 50 ...)

  * improved multi-threaded modes (-mt option)

  * improved filtering strength determination

  * New function: WebPMuxGetCanvasSize

  * BMP and TIFF format output added to 'dwebp'

  * Significant memory reduction for decoding lossy images with alpha.

  * Intertwined decoding of RGB and alpha for a shorter

    time-to-first-decoded-pixel.

  * WebPIterator has a new member 'has_alpha' denoting whether the frame

    contains transparency.

  * Container spec amended with new 'blending method' for animation.

- 6/13/13: version 0.3.1

  This is a binary compatible release.

  * Add incremental decoding support for images containing ALPH and ICCP chunks.

  * Python bindings via swig for the simple encode/decode interfaces similar to

    Java.

- 3/20/13: version 0.3.0

  This is a binary compatible release.

  * WebPINewRGB/WebPINewYUVA accept being passed a NULL output buffer

    and will perform auto-allocation.

  * default filter option is now '-strong -f 60'

  * encoding speed-up for lossy methods 3 to 6

  * alpha encoding can be done in parallel to lossy using 'cwebp -mt ...'

  * color profile, metadata (XMP/EXIF) and animation support finalized in the

    container.

  * various NEON assembly additions

  Tool updates / additions:

    * gif2webp added

    * vwebp given color profile & animation support

    * cwebp can preserve color profile / metadata with '-metadata'

- 10/30/12: version 0.2.1

  * Various security related fixes

  * cwebp.exe: fix import errors on Windows XP

  * enable DLL builds for mingw targets

- 8/3/12: version 0.2.0

  * Add support for ARGB -> YUVA conversion for lossless decoder

    New functions: WebPINewYUVA, WebPIDecGetYUVA

  * Add stats for lossless and alpha encoding

  * Security related hardening: allocation and size checks

  * Add PAM output support to dwebp

- 7/19/12: version 0.1.99

  * This is a pre-release of 0.2.0, not an rc to allow for further

    incompatible changes based on user feedback.

  * Alpha channel encode/decode support.

  * Lossless encoder/decoder.

  * Add TIFF input support to cwebp.

  Incompatible changes:

    * The encode ABI has been modified to support alpha encoding.

    * Deprecated function WebPINew() has been removed.

    * Decode function signatures have changed to consistently use size_t over

      int/uint32_t.

    * decode_vp8.h is no longer installed system-wide.

    * cwebp will encode the alpha channel if present.

- 9/19/11: version 0.1.3

  * Advanced decoding APIs.

  * On-the-fly cropping and rescaling of images.

  * SSE2 instructions for decoding performance optimizations on x86 based

    platforms.

  * Support Multi-threaded decoding.

  * 40% improvement in Decoding performance.

  * Add support for RGB565, RGBA4444 & ARGB image colorspace.

  * Better handling of large picture encoding.

- 3/25/11: version 0.1.2

  * Incremental decoding: picture can be decoded byte-by-byte if needs be.

  * lot of bug-fixes, consolidation and stabilization

- 2/23/11: initial release of version 0.1, with the new encoder

- 9/30/10: initial release version with only the lightweight decoder