- 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