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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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32
makefile.unix
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@ -54,6 +54,8 @@ ARFLAGS = r
CC = gcc -Isrc/ -Iexamples/ -Wall
CFLAGS = -O3 -DNDEBUG $(EXTRA_FLAGS)
INSTALL = install
GROFF = /usr/bin/groff
COL = /usr/bin/col
LDFLAGS = $(EXTRA_LIBS) -lm
DEC_OBJS = src/dec/frame.o src/dec/webp.o src/dec/quant.o src/dec/tree.o \
@ -68,7 +70,8 @@ DSP_OBJS = src/dsp/cpu.o src/dsp/enc.o \
src/dsp/enc_sse2.o src/dsp/dec.o src/dsp/dec_sse2.o \
src/dsp/dec_neon.o src/dsp/upsampling.o src/dsp/upsampling_sse2.o \
src/dsp/yuv.o
UTILS_OBJS = src/utils/bit_reader.o src/utils/bit_writer.o src/utils/thread.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
OBJS = $(DEC_OBJS) $(ENC_OBJS) $(DSP_OBJS) $(UTILS_OBJS)
@ -77,10 +80,13 @@ MUX_OBJS = src/mux/mux.o
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/bit_writer.h src/utils/bit_reader.h src/utils/thread.h
src/utils/alpha.h src/utils/bit_writer.h src/utils/bit_reader.h \
src/utils/thread.h src/utils/tcoder.h
OUTPUT = examples/cwebp examples/dwebp examples/webpmux \
src/libwebp.a src/mux/libwebpmux.a
OUT_LIBS = src/libwebp.a src/mux/libwebpmux.a
OUT_EXAMPLES = examples/cwebp examples/dwebp examples/webpmux
OUTPUT = $(OUT_LIBS) $(OUT_EXAMPLES)
all:ex
@ -93,29 +99,29 @@ src/libwebp.a: $(OBJS)
src/mux/libwebpmux.a: $(MUX_OBJS)
$(AR) $(ARFLAGS) $@ $^
ex: examples/cwebp examples/dwebp examples/webpmux
ex: $(OUT_EXAMPLES)
examples/cwebp: examples/cwebp.o src/libwebp.a
examples/dwebp: examples/dwebp.o src/libwebp.a
examples/webpmux: examples/webpmux.o src/mux/libwebpmux.a src/libwebp.a
examples/cwebp examples/dwebp examples/webpmux:
$(OUT_EXAMPLES):
$(CC) -o $@ $^ $(LDFLAGS)
dist: DESTDIR := dist
dist: all
$(INSTALL) -m755 -d $(DESTDIR)/include/webp \
$(DESTDIR)/doc $(DESTDIR)/lib
$(INSTALL) -m755 -s examples/cwebp examples/dwebp examples/webpmux \
$(DESTDIR)
$(DESTDIR)/doc $(DESTDIR)/lib
$(INSTALL) -m755 -s $(OUT_EXAMPLES) $(DESTDIR)
$(INSTALL) -m644 src/webp/*.h $(DESTDIR)/include/webp
$(INSTALL) -m644 src/libwebp.a $(DESTDIR)/lib
umask 022; \
for m in man/[cd]webp.1; do \
basenam=$$(basename $$m .1); \
/usr/bin/groff -t -e -man -T utf8 $$m \
| col -bx >$(DESTDIR)/doc/$${basenam}.txt; \
/usr/bin/groff -t -e -man -T html $$m \
| col -bx >$(DESTDIR)/doc/$${basenam}.html; \
$(GROFF) -t -e -man -T utf8 $$m \
| $(COL) -bx >$(DESTDIR)/doc/$${basenam}.txt; \
$(GROFF) -t -e -man -T html $$m \
| $(COL) -bx >$(DESTDIR)/doc/$${basenam}.html; \
done
clean: