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Vincent Rabaud 828b4ce062 Switch ExtraCost to ints and implement it in SSE. 
The histograms count the occurrences of len/dist in entropy images.
Those (at most (1<<14) by (1<<14)) are sub-sampled by at least
MIN_HUFFMAN_BITS == 2, hence at most 24 bits in a histogram value.
At most, we multiply by 19 (because the longest histogram is of
size 40 and we do 40>>1, cf code) for the bit cost. So it all fits
in 32 bits.

Change-Id: Ife24b035f54794851ff31f2fac07901f724c6d7f
2023-06-01 10:17:13 +02:00
cmake Do not find_package image libraries if not needed. 2023-05-26 00:14:05 +02:00
doc doc/webp-container-spec: rm future codec comment 2023-05-26 15:48:31 -07:00
examples img2webp: normalize help output 2023-03-17 15:37:55 -07:00
extras bump version to 1.3.0 2022-12-16 16:47:42 -08:00
gradle/wrapper update gradle to 6.1.1 2021-01-02 15:51:55 -08:00
imageio */Android.mk: add a check for NDK_ROOT 2022-12-16 12:10:36 -08:00
infra run_static_analysis.sh: fix scan-build archive path 2022-06-13 16:17:42 -07:00
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man img2webp: normalize help output 2023-03-17 15:37:55 -07:00
sharpyuv move VP8GetCPUInfo declaration to cpu.c 2023-04-27 12:39:13 -07:00
src Switch ExtraCost to ints and implement it in SSE. 2023-06-01 10:17:13 +02:00
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tests fuzz_utils.h: lower kFuzzPxLimit w/ASan 2023-05-24 19:39:38 -07:00
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README.md

WebP Codec

      __   __  ____  ____  ____
     /  \\/  \/  _ \/  _ )/  _ \
     \       /   __/  _  \   __/
      \__\__/\____/\_____/__/ ____  ___
            / _/ /    \    \ /  _ \/ _/
           /  \_/   / /   \ \   __/  \__
           \____/____/\_____/_____/____/v1.3.0

WebP codec is a library to encode and decode images in WebP format. This package contains the library that can be used in other programs to add WebP support, as well as the command line tools 'cwebp' and 'dwebp' to compress and decompress images respectively.

See https://developers.google.com/speed/webp for details on the image format.

The latest source tree is available at https://chromium.googlesource.com/webm/libwebp

It is released under the same license as the WebM project. See https://www.webmproject.org/license/software/ or the "COPYING" file for details. An additional intellectual property rights grant can be found in the file PATENTS.

Building

See the building documentation.

Encoding and Decoding Tools

The examples/ directory contains tools to encode and decode images and animations, view information about WebP images, and more. See the tools documentation.

APIs

See the APIs documentation, and API usage examples in the examples/ directory.

Bugs

Please report all bugs to the issue tracker: https://bugs.chromium.org/p/webp

Patches welcome! See how to contribute.

Discuss

Email: webp-discuss@webmproject.org

Web: https://groups.google.com/a/webmproject.org/group/webp-discuss