Re: [FFmpeg-devel] [PATCH v8 07/18] swscale/ops: introduce new low level framework

[Andreas Rheinhardt <andreas.rheinhardt@outlook.com>]

Niklas Haas:
> From: Niklas Haas <git@haasn.dev>
> 
> See docs/swscale-v2.txt for an in-depth introduction to the new approach.
> 
> This commit merely introduces the ops definitions and boilerplate functions.
> The subsequent commits will flesh out the underlying implementation.
> ---
>  libswscale/Makefile |   1 +
>  libswscale/ops.c    | 524 ++++++++++++++++++++++++++++++++++++++++++++
>  libswscale/ops.h    | 243 ++++++++++++++++++++
>  3 files changed, 768 insertions(+)
>  create mode 100644 libswscale/ops.c
>  create mode 100644 libswscale/ops.h
> 

> +
> +static const char *describe_lin_mask(uint32_t mask)
> +{
> +    /* Try to be fairly descriptive without assuming too much */
> +    static const struct {
> +        const char *name;

Please avoid the relocations.

> +        uint32_t mask;
> +    } patterns[] = {
> +        { "noop",               0 },
> +        { "luma",               SWS_MASK_LUMA },
> +        { "alpha",              SWS_MASK_ALPHA },
> +        { "luma+alpha",         SWS_MASK_LUMA | SWS_MASK_ALPHA },
> +        { "dot3",               0b111 },
> +        { "dot4",               0b1111 },

src/libswscale/ops.c:369:33: warning: binary constants are a C23 feature
or GCC extension
  369 |         { "dot3",               0b111 },
      |                                 ^~~~~
src/libswscale/ops.c:370:33: warning: binary constants are a C23 feature
or GCC extension
  370 |         { "dot4",               0b1111 },
      |                                 ^~~~~~

(There are also a few other instances of this at other places.)

> +        { "row0",               SWS_MASK_ROW(0) },
> +        { "row0+alpha",         SWS_MASK_ROW(0) | SWS_MASK_ALPHA },
> +        { "col0",               SWS_MASK_COL(0) },
> +        { "col0+off3",          SWS_MASK_COL(0) | SWS_MASK_OFF3 },
> +        { "off3",               SWS_MASK_OFF3 },
> +        { "off3+alpha",         SWS_MASK_OFF3 | SWS_MASK_ALPHA },
> +        { "diag3",              SWS_MASK_DIAG3 },
> +        { "diag4",              SWS_MASK_DIAG4 },
> +        { "diag3+alpha",        SWS_MASK_DIAG3 | SWS_MASK_ALPHA },
> +        { "diag3+off3",         SWS_MASK_DIAG3 | SWS_MASK_OFF3 },
> +        { "diag3+off3+alpha",   SWS_MASK_DIAG3 | SWS_MASK_OFF3 | SWS_MASK_ALPHA },
> +        { "diag4+off4",         SWS_MASK_DIAG4 | SWS_MASK_OFF4 },
> +        { "matrix3",            SWS_MASK_MAT3 },
> +        { "matrix3+off3",       SWS_MASK_MAT3 | SWS_MASK_OFF3 },
> +        { "matrix3+off3+alpha", SWS_MASK_MAT3 | SWS_MASK_OFF3 | SWS_MASK_ALPHA },
> +        { "matrix4",            SWS_MASK_MAT4 },
> +        { "matrix4+off4",       SWS_MASK_MAT4 | SWS_MASK_OFF4 },
> +    };
> +
> +    for (int i = 0; i < FF_ARRAY_ELEMS(patterns); i++) {
> +        if (!(mask & ~patterns[i].mask))
> +            return patterns[i].name;
> +    }
> +
> +    return "full";
> +}
> +
> +#endif

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