Function avifImageDownshiftTo8bpc

src/reformat_libyuv.c:906–930

}

static avifResult avifImageDownshiftTo8bpc(const avifImage * image, avifImage * image8, avifBool downshiftAlpha)
{
    avifImageSetDefaults(image8);
    avifImageCopyNoAlloc(image8, image);
    image8->depth = 8;
    // downshiftAlpha will be true only if the image has an alpha plane. So it is safe to pass AVIF_PLANES_ALL here in that case.
    assert(!downshiftAlpha || image->alphaPlane);
    AVIF_CHECKRES(avifImageAllocatePlanes(image8, downshiftAlpha ? AVIF_PLANES_ALL : AVIF_PLANES_YUV));
    // 16384 for 10-bit and 4096 for 12-bit.
    const int scale = 1 << (24 - image->depth);
    for (int plane = AVIF_CHAN_Y; plane <= (downshiftAlpha ? AVIF_CHAN_A : AVIF_CHAN_V); ++plane) {
        const uint32_t planeWidth = avifImagePlaneWidth(image, plane);
        if (planeWidth == 0) {
            continue;
        }
        Convert16To8Plane((const uint16_t *)avifImagePlane(image, plane),
                          avifImagePlaneRowBytes(image, plane) / 2,
                          avifImagePlane(image8, plane),
                          avifImagePlaneRowBytes(image8, plane),
                          scale,
                          planeWidth,
                          avifImagePlaneHeight(image, plane));
    }
    return AVIF_RESULT_OK;
}

IGNORE_CFI_ICALL avifResult avifImageYUVToRGBLibYUV(const avifImage * image, avifRGBImage * rgb, avifBool reformatAlpha, avifBool * alphaReformattedWithLibYUV)
{