7bda3deb89
Take advantage of the known sizes used by VP8LHistogramAdd() and remove loop for the remainder. The loop was being auto-vectorized making the code larger and slower than the vectorized C code. For larger sizes the new code is ~4-7% faster than the old code with about the same improvement against the vectorized C code. For the minimal size (40), the new code is ~30% faster than the C and old SSE2 code. The LINE_SIZE==8 option is removed with this change. It had been set to 16 for its entire life and clang-16 was unrolling the LINE_SIZE==8 case by 2 in any case; they both profile similarly. Change-Id: I2376e2dca3bffa38477b4a432f4c533419e3be0e
WebP Codec
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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. For security reports, select 'Security report' from the Template dropdown.
Patches welcome! See how to contribute.
Discuss
Email: webp-discuss@webmproject.org
Web: https://groups.google.com/a/webmproject.org/group/webp-discuss