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multi-thread decoding: ~25-30% faster

Browse Source 
To be enabled with the flag WEBP_USE_THREAD.
For now it's only available on unix (pthread), when using Makefile.unix
Will be switched on more generally later.

In-loop filtering and output (=rescaling/yuv->rgb conversion)
is done in parallel to bitstream decoding, lagging 1 row behind.

Example:
examples/dwebp bryce.webp -v
Time to decode picture: 0.680s

examples/dwebp bryce.webp -v -mt
Time to decode picture: 0.515s

Change-Id: Ic30a897423137a3bdace9c4e30465ef758fe53f2
This commit is contained in:
Pascal Massimino
2011-07-22 13:09:10 -07:00
parent acd8ba4229
commit fc7815d692
16 changed files with 519 additions and 120 deletions
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4
src/dec/Makefile.am
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@ -2,13 +2,13 @@ AM_CPPFLAGS = -I$(top_srcdir)/src
libwebpdecode_la_SOURCES = bits.h vp8i.h yuv.h bits.c dsp.c dsp_sse2.c frame.c \
quant.c tree.c vp8.c webp.c yuv.c idec.c alpha.c \
layer.c io.c io_sse2.c buffer.c
layer.c io.c io_sse2.c buffer.c thread.c
libwebpdecode_la_LDFLAGS = -version-info 0:0:0
libwebpdecode_la_CPPFLAGS = $(USE_EXPERIMENTAL_CODE)
libwebpdecodeinclude_HEADERS = ../webp/decode.h ../webp/decode_vp8.h ../webp/types.h
libwebpdecodeincludedir = $(includedir)/webp
noinst_HEADERS = bits.h vp8i.h webpi.h yuv.h
noinst_HEADERS = bits.h vp8i.h webpi.h yuv.h thread.h
noinst_LTLIBRARIES = libwebpdecode.la
# uncomment the following line (and comment the above) if you want