+added gamma conversion to refactored code

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

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

Process more lines in a single pass to improve performance
Signed-off-by: NMichael Niedermayer <michael@niedermayer.cc>

+ split color conversion from scaling
- disabled gamma correction, until it's refactored too
Signed-off-by: NMichael Niedermayer <michael@niedermayer.cc>

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

Fixes Ticket4746
Signed-off-by: NMichael Niedermayer <michael@niedermayer.cc>

This simplifies allocating and initializing swscale contexts with custom options.
The function is internal currently but could be moved into the public header
Signed-off-by: NMichael Niedermayer <michael@niedermayer.cc>

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

This avoids using up a bit of the public flags
Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>

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

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

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

Fixes out of array access
Fixes: case2_bad_read_yuv2rgbx32.mp4
Found-by: NMichal Zalewski <lcamtuf@coredump.cx>
Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>

Fixes Ticket3170
Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>

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

Fixes Ticket644
Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>

Based on a long debug session with Kostya.

The rationale is that you have a packed format in form
<greyscale sample> <alpha sample> <greyscale sample> <alpha sample>
and shortening greyscale to 'G' might make one thing about Greenscale instead.
An alias pixel format and color space name are provided for compatibility.

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

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

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

Reviewed-by: NTimothy Gu <timothygu99@gmail.com>
Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>

This can help "extreme" resizes, e.g with some 4k stuff.
Signed-off-by: NDerek Buitenhuis <derek.buitenhuis@gmail.com>

Blackfin is a painful platform to work with, no test machines are available
and the range of multimedia applications is dubious. Thus it only represents
a maintenance burden.

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

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

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

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

swscale/swscale_internal: make the offset strings update themselfs when the MAX_FILTER_SIZE is changed
Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>

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

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

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

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

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

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: NReimar Döffinger <Reimar.Doeffinger@gmx.de>

Also give consistent names to init functions.