This patch uses dithering in DITHER_COPY macro only if
it was not used option '-sws_dither none'.
With option '-sws_dither none' it uses downshift.

For human eye dithering is OK, for video codecs not necessarily.
If user don't want to use dithering, we should respect that.

Signed-off-by: Mateusz Brzostek <mateuszb@poczta.onet.pl>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

"apix_fmts" found by Marc Péchaud.
"speedloss" found by Mikhail V.

Signed-off-by: Lou Logan <lou@lrcd.com>

Fixes:

    libswscale/utils.c:1632:5: warning: macro expansion producing 'defined' has undefined behavior [-Wexpansion-to-defined]
    #if USE_MMAP
        ^
    libswscale/utils.c:1577:49: note: expanded from macro 'USE_MMAP'
    #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)
                                                    ^
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

Based on b4befca2 and 6b7849e6 by Paul B Mahol.

Fixes ticket #6608.

Fixes filter-pixfmts-scale test failing on big-endian systems due to
alpSrc not being cast to (const int32_t**).

Also fixes distortions in the output alpha channel values by copying the
alpha channel code from the rgba64 case found elsewhere in output.c.

Fixes ticket 6555.

Signed-off-by: James Cowgill <James.Cowgill@imgtec.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Fix CID 1415949

Fixes ticket #6554

This will be required for the next commit.

None of them are specific to the YASM assembler.

(Cherry-picked from libav commit 39e208f4)

Signed-off-by: James Almer <jamrial@gmail.com>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Avoid warnings about types mismatch and make the code a little simpler.

It is undefined in C as reported:
    warning: shifting a negative signed value is undefined

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

This disables everything that was deprecated at least 18 months ago.

Readjust the minimum API version as needed, postponing any
API-incompatible changes until the next bump.

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

Reduce diff with Libav.

Test the pixel format querying within libswscale.

Also do some small cosmetic changes: Drop pointless _MMX suffix from ABSD2
macro name, drop pointless check for MMX support, we always assume MMX is
available in our SIMD code, fix spelling.

Fixes a gcc warning:
libswscale/slice.c:178:56: warning: assignment discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]

Fixes warnings like the following:
libswscale/input.c:951:13: warning: ‘planar_rgb14be_to_a’ defined but not used

None of them are specific to the YASM assembler.