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

If width is not alligned with hsub, background component should only be
multiplied once by sub alpha component.

Signed-off-by: Martin Storsjö <martin@martin.st>

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

git blame:
    423 Nicolas George
     86 Stefano Sabatini
     19 Michael Niedermayer
      1 Reimar Döffinger

Initial commit:
commit bcfd9e82
Author: Stefano Sabatini <stefano.sabatini-lala@poste.it>
Date:   Sun Feb 20 23:42:17 2011 +0100

    lavfi: add drawutils

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

This fixes that the GIF encoder crashes with it because
it has no palette.
And the arguments for the pseudopalette apply to gray8 as
much as to RGB8 etc.
In addition the changes required in lavfi should be needed anyway
when adding support for RGB8 etc.

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

This new API stores useful data in a dedicated structure
and has clearly delimited init functions.

Hopefully, uses of the old API can be replaced quickly.

Signed-off-by: Mans Rullgard <mans@mansr.com>

Add drawutils.h and drawutils.c, and use them in the pad filter.
The new functions are going to be shared by other filters.

Signed-off-by: Mans Rullgard <mans@mansr.com>

Add drawutils.h and drawutils.c, and use them in the pad filter.
The new functions are going to be shared by other filters.

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