Add a libwebp encoder
hevc: move DSP declarations from hevc.h into hevcdsp.h

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
Merge commit 'be7c323176e2e5fcf30e3d2ff20975b2f936811b'

* commit 'be7c323176e2e5fcf30e3d2ff20975b2f936811b':
  Add a libwebp encoder

Conflicts:
	Changelog
	doc/encoders.texi
	doc/general.texi
	libavcodec/version.h
	libavformat/img2enc.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  hevc: move DSP declarations from hevc.h into hevcdsp.h

Conflicts:
	libavcodec/hevc.h
	libavcodec/hevcdsp.c
	libavcodec/hevcdsp.h

See: c8dd048ab8cff815c9f4b16a62db0b74df011f0a
Merged-by: Michael Niedermayer <michaelni@gmx.at>
VC1: Fix intensity compensation performance regression

Fix https://trac.ffmpeg.org/ticket/3204

The problem was that intensity compensation was always used once it was
encountered. This is because v->next_use_ic was never set back to zero.
To fix this, when resetting v->next_luty/uv, also reset v->next_use_ic.

This improved (restored) performance by 85% when decoding
http://bit.ly/bbbwmv

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
vc1: simplify *_use_ic initialization

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>