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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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5
makefile.unix
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@ -71,7 +71,8 @@ DSP_OBJS = src/dsp/cpu.o src/dsp/enc.o \
src/dsp/dec_neon.o src/dsp/upsampling.o src/dsp/upsampling_sse2.o \
src/dsp/yuv.o
UTILS_OBJS = src/utils/alpha.o src/utils/bit_reader.o src/utils/bit_writer.o \
src/utils/quant_levels.o src/utils/thread.o src/utils/tcoder.o
src/utils/filters.o src/utils/quant_levels.o src/utils/thread.o \
src/utils/tcoder.o
OBJS = $(DEC_OBJS) $(ENC_OBJS) $(DSP_OBJS) $(UTILS_OBJS)
@ -81,7 +82,7 @@ HDRS = src/webp/encode.h src/enc/vp8enci.h src/enc/cost.h src/webp/mux.h \
src/dec/vp8i.h \
src/dsp/yuv.h src/dsp/dsp.h \
src/utils/alpha.h src/utils/bit_writer.h src/utils/bit_reader.h \
src/utils/thread.h src/utils/tcoder.h
src/utils/filters.h src/utils/thread.h src/utils/tcoder.h
OUT_LIBS = src/libwebp.a src/mux/libwebpmux.a
OUT_EXAMPLES = examples/cwebp examples/dwebp examples/webpmux