Hi,
On Thu, Aug 6, 2015 at 4:27 PM, Michael Niedermayer <michae...@gmx.at>
wrote:
> From: Michael Niedermayer <mich...@niedermayer.cc>
>
> Fixes Ticket4746
>
> TODO: implement packed formats and subsampled formats
>
> Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
> ---
> doc/scaler.texi | 13 ++++++
> libswscale/Makefile | 3 +-
> libswscale/alphablend.c | 55 +++++++++++++++++++++++
> libswscale/options.c | 3 ++
> libswscale/swscale_internal.h | 12 +++++
> libswscale/utils.c | 97
> +++++++++++++++++++++++++++++++++++++++++
> 6 files changed, 182 insertions(+), 1 deletion(-)
> create mode 100644 libswscale/alphablend.c
>
> diff --git a/doc/scaler.texi b/doc/scaler.texi
> index 23d6393..4c55334 100644
> --- a/doc/scaler.texi
> +++ b/doc/scaler.texi
> @@ -122,6 +122,19 @@ a_dither).
>
> @end table
>
> +@item alphablend
> +Set the alpha blending to use when the input has alpha but the output
> does not.
> +Default value is @samp{black}.
> +
> +@table @samp
> +@item black
> +Blend onto black
> +
> +@item none
> +No blending
> +
> +@end table
> +
> @end table
I must admit I'm not a fan of having just two values for something like
this. It seems to me you want 2 options, "blendmode", being "none" or
"background" (or a float/alpha between 1.0/0.0), and the actual background
color (black, white, blue, r=a,g=b,c=d). "black" vs. "none" seems like a
future compat nightmare. Is it that hard to implement a proper rgb/yuv
value solution?
Ronald
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