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VP8LSetBitPos: remove the eos_ setting

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This code is ultra-critical for lossless decoding, especially on ARM.
The extra call VP8LIsEndOfStream() was causing unnecessary slow-down.

Now, we check for bitstream-end separately in the main loop.

Change-Id: I739b5d74cc29578e2b712ba99b544fd995ef0e0d
This commit is contained in:
skal
2017-02-11 01:51:37 -08:00
parent 027151ca6c
commit 16be192f47
2 changed files with 8 additions and 6 deletions
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3
src/utils/bit_reader_utils.h
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@ -155,9 +155,10 @@ static WEBP_INLINE int VP8LIsEndOfStream(const VP8LBitReader* const br) {
// For jumping over a number of bits in the bit stream when accessed with
// VP8LPrefetchBits and VP8LFillBitWindow.
// This function does *not* set br->eos_, since it's speed-critical.
// Use with extreme care!
static WEBP_INLINE void VP8LSetBitPos(VP8LBitReader* const br, int val) {
br->bit_pos_ = val;
br->eos_ = VP8LIsEndOfStream(br);
}
// Advances the read buffer by 4 bytes to make room for reading next 32 bits.