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Add Alpha encode/decode code.

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Add code for Alpha encoding & decoding. The alpha compression is done
via backward reference counts encoded with Arithmetic encoder (TCoder).
Also provided is lossy Alpha pre-processing option via level-quantizations
using kNN heuristic.

Change-Id: Ib6b13530c1a4ab6493edcb586ad29fe242bc1766
This commit is contained in:
Vikas Arora
2011-11-30 17:46:45 +05:30
parent afc4c5d695
commit e1947a9299
9 changed files with 1284 additions and 15 deletions
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6
src/utils/Makefile.am
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@ -1,10 +1,12 @@
AM_CPPFLAGS = -I$(top_srcdir)/src
libwebputils_la_SOURCES = bit_reader.h bit_reader.c \
libwebputils_la_SOURCES = alpha.h alpha.c \
bit_reader.h bit_reader.c \
bit_writer.h bit_writer.c \
quant_levels.c \
tcoder.h tcoderi.h tcoder.c \
thread.h thread.c
libwebputils_la_LDFLAGS = -version-info 0:0:0
libwebputils_la_CPPFLAGS = $(USE_EXPERIMENTAL_CODE)
libwebputilsinclude_HEADERS = ../webp/types.h
libwebputilsincludedir = $(includedir)/webp