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multi-threaded alpha encoding for lossy

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new option: 'cwebp -mt ...'
new config flag: config.thread_level
(allowed thread_level are 0 or 1 for now. Maybe more later...)
If -mt is activated (and WEBP_USE_THREAD is used for compile), the alpha-compression
will be done in parallel to RGB coding for lossy. Can save quite a bit of latency...
Has no effect for lossless encoding.

Change-Id: I769d0bf90e7380cf99344ad62cd77277f4df5a46
This commit is contained in:
skal
2013-03-01 01:21:34 +01:00
parent 72655350ea
commit f817930a55
9 changed files with 96 additions and 33 deletions
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@ -158,6 +158,7 @@ options:
-pass <int> ............ analysis pass number (1..10)
-crop <x> <y> <w> <h> .. crop picture with the given rectangle
-resize <w> <h> ........ resize picture (after any cropping)
-mt .................... use multi-threading if available
-map <int> ............. print map of extra info.
-print_psnr ............ prints averaged PSNR distortion.
-print_ssim ............ prints averaged SSIM distortion.