swscale/internal: expose ff_update_palette() internally

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Niklas Haas <[email protected]>

Author: haasn

libswscale/swscale.c

@@ -748,7 +748,7 @@ static void rgb48Toxyz12(struct SwsContext *c, uint16_t *dst,
     }
 }
 
-static void update_palette(SwsContext *c, const uint32_t *pal)
+void ff_update_palette(SwsContext *c, const uint32_t *pal)
 {
     for (int i = 0; i < 256; i++) {
         int r, g, b, y, u, v, a = 0xff;
@@ -946,7 +946,7 @@ static int scale_internal(SwsContext *c,
             memset(c->dither_error[i], 0, sizeof(c->dither_error[0][0]) * (c->dstW+2));
 
     if (usePal(c->srcFormat))
-        update_palette(c, (const uint32_t *)srcSlice[1]);
+        ff_update_palette(c, (const uint32_t *)srcSlice[1]);
 
     memcpy(src2,       srcSlice,  sizeof(src2));
     memcpy(dst2,       dstSlice,  sizeof(dst2));

libswscale/swscale_internal.h

@@ -694,6 +694,8 @@ void ff_yuv2rgb_init_tables_ppc(SwsContext *c, const int inv_table[4],
 
 void ff_updateMMXDitherTables(SwsContext *c, int dstY);
 
+void ff_update_palette(SwsContext *c, const uint32_t *pal);
+
 av_cold void ff_sws_init_range_convert(SwsContext *c);
 av_cold void ff_sws_init_range_convert_aarch64(SwsContext *c);
 av_cold void ff_sws_init_range_convert_loongarch(SwsContext *c);