Fixes ticket #3495.

Both of these dithering methods are from http://pippin.gimp.org/a_dither/ for
GIF they can be considered better than bayer (provides more gray-levels), and
spatial stability - often more than twice as good compression and less visual
flicker than error diffusion methods (the methods also avoids error-shadow
artifacts of diffusion dithers).

These methods are similar to blue/green noise type dither masks; but are
simple enough to generate their mask on the fly. They are still research work
in progress; though more expensive to generate masks (which can be used in a
LUT) like 'void and cluster' and similar methods will yield superior results

Should fix fate failure with clang ftrapv

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

This is part of the patch-set for intel C inline asm on windows support

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

Improves rgb -> gray16 conversion

Fixes Ticket3422

The pam and png output files look visually similar, in both cases the
dynamics increase to 0x0 -> 0xfffb.

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

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

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

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

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

SPARC is no longer being used in any multimedia-related fields and the
VIS optimizations only represent a maintenance burden.

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

Signed-off-by: Anton Khirnov <anton@khirnov.net>

This does not yet include any actual AVX code

Signed-off-by: Anton Khirnov <anton@khirnov.net>

Signed-off-by: Anton Khirnov <anton@khirnov.net>

Signed-off-by: Anton Khirnov <anton@khirnov.net>

See: "19:40 Yu Xiaolei Re: [FFmpeg-devel] [PATCH] fix build with gas-preprocessor.pl"

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

This reverts commit c8c7736c10.

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

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

Fixes r210(rgb48) -> ffv1 (gbrp10) -> r210 roundtrip
as reported by forum user JasonCA.

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

use string comparison in assembler derivatives to prevents assembler from treating names in test expressions as imported symbols

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

This is a more sensible place for these macros.

Fixes Ticket3242
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

Signed-off-by: Yu Xiaolei <dreifachstein@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Fixes artifacts where fast bilinear was used for downscaling chroma

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

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

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

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

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

Uniform the style and eliminate a warning on newer doxygen version..

makes the first call to sws_getContext() 1ms faster

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

Originally written by James Almer <jamrial@gmail.com>

With the following contributions by Timothy Gu <timothygu99@gmail.com>

* Use descriptions of libraries from the pkg-config file generation function
* Use "FFmpeg Project" as CompanyName (suggested by Alexander Strasser)
* Use "FFmpeg" for ProductName as MSDN says "name of the product with which the
  file is distributed" [1].
* Use FFmpeg's version (N-xxxxx-gxxxxxxx) for ProductVersion per MSDN [1].
* Only build the .rc files when --enable-small is not enabled.

[1] http://msdn.microsoft.com/en-us/library/windows/desktop/aa381058.aspx

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

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

This makes the code more similar to the other optims and allows us
to use the same macros to build function names

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

This does not yet include any actual AVX code

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

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

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

Found-by: Михаил <Micky53@mail.ru>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Allow some dumb factorizations, slightly decrease spaghetti factor.

Aligning the tables reduces the amount of code generated on
e.g. ARM as the offset constant then has few enough set bits
so it can be encoded inside a single instruction instead of 2.
Ideally all should be declared aligned, but the DECLARE_ALIGNED
macros does not work with pointer tables, thus also reordered
the tables.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>