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Introduce a 'fast' alpha mode

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.. where only 2 filtering modes are potentially
tried, instead of all of them. This is fast than the exhaustive 'best'
mode, and not much worse.

Options for cwebp are:
 -alpha_filter none
 -alpha_filter fast      (<- default)
 -alpha_filter best      (<- slow)

Change-Id: I8cb90ee11b8f981811e013ea4ad5bf72ba3ea7d4
This commit is contained in:
Pascal Massimino
2012-01-08 19:27:21 -08:00
parent ad1e163a0d
commit 8ca2076de1
9 changed files with 179 additions and 153 deletions
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2
src/enc/config.c
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@ -42,7 +42,7 @@ int WebPConfigInitInternal(WebPConfig* const config,
config->autofilter = 0;
config->partition_limit = 0;
config->alpha_compression = 1;
config->alpha_filtering = 0;
config->alpha_filtering = 1;
config->alpha_quality = 100;
// TODO(skal): tune.