[FFmpeg-devel] [PATCH 4/6] avcodec/hnm4video: Optimize postprocess_current_frame()

[Tomas Härdin]

lör 2019-08-03 klockan 01:49 +0200 skrev Michael Niedermayer:
> -    uint32_t x, y, src_x, src_y;
> +    uint32_t x, y, src_y;
> +    int width = hnm->width;
>  
>      for (y = 0; y < hnm->height; y++) {
> +        uint8_t *dst = hnm->processed + y * width;
> +        const uint8_t *src = hnm->current;
>          src_y = y - (y % 2);
> -        src_x = src_y * hnm->width + (y % 2);
> -        for (x = 0; x < hnm->width; x++) {
> -            hnm->processed[(y * hnm->width) + x] = hnm-
> >current[src_x];
> -            src_x += 2;
> +        src += src_y * width + (y % 2);
> +        for (x = 0; x < width; x++) {
> +            dst[x] = *src;
> +            src += 2;

Looks OK. Maybe telling the compiler that src and dst don't alias would
be worthwhile?

/Tomas