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multi-thread decoding: ~25-30% faster

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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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6
src/dec/webp.c
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@ -92,6 +92,12 @@ static VP8StatusCode DecodeInto(const uint8_t* data, uint32_t data_size,
io.data_size = data_size;
WebPInitCustomIo(params, &io); // Plug the I/O functions.
#ifdef WEBP_USE_THREAD
dec->use_threads_ = params->options && (params->options->use_threads > 0);
#else
dec->use_threads_ = 0;
#endif
// Decode bitstream header, update io->width/io->height.
if (!VP8GetHeaders(dec, &io)) {
status = VP8_STATUS_BITSTREAM_ERROR;