Function avifImageCopySamples

src/avif.c:187–225

}

void avifImageCopySamples(avifImage * dstImage, const avifImage * srcImage, avifPlanesFlags planes)
{
    assert(srcImage->depth == dstImage->depth);
    if (planes & AVIF_PLANES_YUV) {
        assert(srcImage->yuvFormat == dstImage->yuvFormat);
        // Note that there may be a mismatch between srcImage->yuvRange and dstImage->yuvRange
        // because libavif allows for 'colr' and AV1 OBU video range values to differ.
    }
    const size_t bytesPerPixel = avifImageUsesU16(srcImage) ? 2 : 1;

    const avifBool skipColor = !(planes & AVIF_PLANES_YUV);
    const avifBool skipAlpha = !(planes & AVIF_PLANES_A);
    for (int c = AVIF_CHAN_Y; c <= AVIF_CHAN_A; ++c) {
        const avifBool alpha = c == AVIF_CHAN_A;
        if ((skipColor && !alpha) || (skipAlpha && alpha)) {
            continue;
        }

        const uint32_t planeWidth = avifImagePlaneWidth(srcImage, c);
        const uint32_t planeHeight = avifImagePlaneHeight(srcImage, c);
        const uint8_t * srcRow = avifImagePlane(srcImage, c);
        uint8_t * dstRow = avifImagePlane(dstImage, c);
        const uint32_t srcRowBytes = avifImagePlaneRowBytes(srcImage, c);
        const uint32_t dstRowBytes = avifImagePlaneRowBytes(dstImage, c);
        assert(!srcRow == !dstRow);
        if (!srcRow) {
            continue;
        }
        assert(planeWidth == avifImagePlaneWidth(dstImage, c));
        assert(planeHeight == avifImagePlaneHeight(dstImage, c));

        const size_t planeWidthBytes = planeWidth * bytesPerPixel;
        for (uint32_t y = 0; y < planeHeight; ++y) {
            memcpy(dstRow, srcRow, planeWidthBytes);
            srcRow += srcRowBytes;
            dstRow += dstRowBytes;
        }
    }
}

static avifResult avifImageCopyProperties(avifImage * dstImage, const avifImage * srcImage)
{