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swscale/utils: lazily allocate XYZ tables on CONFIG_SMALL

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This has the downside of requiring these tables to be recomputed on every
init, but saves ~270 kB of static data.

Signed-off-by: Niklas Haas <git@haasn.dev>
This commit is contained in:
Niklas Haas
2024-12-23 13:21:21 +01:00
parent 60bfafcd8a
commit 59258fb90e
1 changed files with 21 additions and 5 deletions
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26
libswscale/utils.c
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@ -951,29 +951,42 @@ static int fill_xyztables(SwsInternal *c)
{1689, 1464, 739},
{ 871, 2929, 296},
{ 79, 488, 3891} };
#if !CONFIG_SMALL
static uint16_t xyzgamma_tab[4096], rgbgammainv_tab[4096];
static uint16_t rgbgamma_tab[65536], xyzgammainv_tab[65536];
#endif
if (c->xyzgamma)
return 0;
memcpy(c->xyz2rgb_matrix, xyz2rgb_matrix, sizeof(c->xyz2rgb_matrix));
memcpy(c->rgb2xyz_matrix, rgb2xyz_matrix, sizeof(c->rgb2xyz_matrix));
#if CONFIG_SMALL
c->xyzgamma = av_malloc(sizeof(uint16_t) * 2 * (4096 + 65536));
if (!c->xyzgamma)
return AVERROR(ENOMEM);
c->rgbgammainv = c->xyzgamma + 4096;
c->rgbgamma = c->rgbgammainv + 4096;
c->xyzgammainv = c->rgbgamma + 65536;
#else
c->xyzgamma = xyzgamma_tab;
c->rgbgamma = rgbgamma_tab;
c->xyzgammainv = xyzgammainv_tab;
c->rgbgammainv = rgbgammainv_tab;
if (xyzgamma_tab[4095])
return 0;
#endif
/* set input gamma vectors */
for (i = 0; i < 4096; i++) {
xyzgamma_tab[i] = lrint(pow(i / 4095.0, xyzgamma) * 65535.0);
rgbgammainv_tab[i] = lrint(pow(i / 4095.0, rgbgammainv) * 65535.0);
c->xyzgamma[i] = lrint(pow(i / 4095.0, xyzgamma) * 65535.0);
c->rgbgammainv[i] = lrint(pow(i / 4095.0, rgbgammainv) * 65535.0);
}
/* set output gamma vectors */
for (i = 0; i < 65536; i++) {
rgbgamma_tab[i] = lrint(pow(i / 65535.0, rgbgamma) * 4095.0);
xyzgammainv_tab[i] = lrint(pow(i / 65535.0, xyzgammainv) * 4095.0);
c->rgbgamma[i] = lrint(pow(i / 65535.0, rgbgamma) * 4095.0);
c->xyzgammainv[i] = lrint(pow(i / 65535.0, xyzgammainv) * 4095.0);
}
return 0;
}
@ -2529,6 +2542,9 @@ void sws_freeContext(SwsContext *sws)
av_freep(&c->gamma);
av_freep(&c->inv_gamma);
#if CONFIG_SMALL
av_freep(&c->xyzgamma);
#endif
av_freep(&c->rgb0_scratch);
av_freep(&c->xyz_scratch);