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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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2
src/enc/alpha.c
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@ -36,7 +36,7 @@ int VP8EncFinishAlpha(VP8Encoder* enc) {
assert(pic->a);
if (!EncodeAlpha(pic->a, pic->width, pic->height, pic->a_stride,
config->alpha_quality, config->alpha_compression,
&tmp_data, &tmp_size)) {
config->alpha_filtering, &tmp_data, &tmp_size)) {
return 0;
}
if (tmp_size != (uint32_t)tmp_size) { // Sanity check.