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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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1
src/utils/Makefile.am
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@ -3,6 +3,7 @@ AM_CPPFLAGS = -I$(top_srcdir)/src
libwebputils_la_SOURCES = alpha.h alpha.c \
bit_reader.h bit_reader.c \
bit_writer.h bit_writer.c \
filters.h filters.c \
quant_levels.c \
tcoder.h tcoderi.h tcoder.c \
thread.h thread.c