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Add predictive filtering option for Alpha.

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Add predictive filtering option for Alpha plane.
Valid range for filter option is [0, 5] corresponding to prediction
methods none, horizontal, vertical, gradient & paeth filter.
The prediction method 5 will try all the prediction methods (0 to 4)
and pick the prediction method that gives best compression.

Change-Id: I9244d4a9c5017501a9696c7cec5045f04c16d49b
This commit is contained in:
Vikas Arora
2012-01-05 13:04:30 +05:30
parent e852f83205
commit 252028aaac
13 changed files with 424 additions and 28 deletions
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3
src/enc/config.c
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@@ -43,6 +43,7 @@ int WebPConfigInitInternal(WebPConfig* const config,
config->autofilter = 0;
config->partition_limit = 0;
config->alpha_compression = 1;
config->alpha_filtering = 0;
config->alpha_quality = 100;
// TODO(skal): tune.
@@ -112,6 +113,8 @@ int WebPValidateConfig(const WebPConfig* const config) {
return 0;
if (config->alpha_compression < 0)
return 0;
if (config->alpha_filtering < 0)
return 0;
if (config->alpha_quality < 0 || config->alpha_quality > 100)
return 0;
return 1;