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9 Commits

Author SHA1 Message Date
Jyrki Alakuijala
699d80ea6b Jump-lookup for Huffman coding 
speeds up those codes that are not part of the main lookup.
This gives a 10 % speedup for a photographic image.

Change-Id: Ief54b0ad77db790a01314402ad351b40ac9a7be4
 2013-06-27 08:59:55 +02:00
skal
24cc307ae3 ~20% faster lossless decoding 
We use help from small LUTs for Huffman decoding.

Change-Id: I58db4ecd37282822094519f2aa14cf544beba975
 2013-06-20 09:41:29 +02:00
skal
313d853fa9 Speedup for decoding lossless WebP photographs: 
use bit_pos instead num_bit to update the bit-reader
37.69 MB/s -> 39.79 MB/s, 5.6 %

Change-Id: Ica476cc3e2fc2db084d6961bea8586b050bb221d
 2013-06-18 17:26:52 +02:00
James Zern
d640614d54 update copyright text 
rather than symlink the webm/vpx terms, use the same header as libvpx to
reference in-tree files

based on the discussion in:
https://codereview.chromium.org/12771026/

Change-Id: Ia3067ecddefaa7ee01550136e00f7b3f086d4af4
 2013-06-06 23:09:14 -07:00
Pascal Massimino
2fc1301577 harmonize authors as "Name (mail@address)" 
Change-Id: I85bfae61a37de75a5ed945a906002de2ef75149f
 2012-07-19 16:09:47 -07:00
Urvang Joshi
14757f8ae2 Make sure huffman trees always have valid symbols 
- Symbols added to the tree are valid inside HuffmanTreeBuildExplicit().
- In HuffmanTreeBuildImplicit(), make sure 'root_symbol' is
valid in case of a single symbol tree.

Change-Id: I7de5de71ff28f41e2d6228b29ed8dd4a20813e99
 2012-05-10 11:40:18 +05:30
Pascal Massimino
8979675bdf harmonize header description 
Change-Id: Ie0256794e663b58557e7234f08af3d516071001e
 2012-05-04 19:01:06 -07:00
James Zern
fbd82b5a39 types.h: centralize use of stddef.h 
for size_t / NULL

Change-Id: If1331d3cf44296ed0ba9e838eae2f5b1bcaeb61b
 2012-04-12 17:14:58 -07:00
James Zern
9c67291d67 add utils/huffman.[hc] from experimental 
Pulled from the current HEAD (218c32e).
The history of this and related files is a bit entangled so rather
trying to split the changes and introduce some noise in master's history
we'll start with a fresh snapshot.
The file progression is still available in the experimental branch.

Change-Id: Ie57be21bf50ad83808c72aeb5fc706d9954d01d8
 2012-04-10 17:31:54 -07:00