Merge "graphics: Update ImageFormat#YUV_420_888 javadoc"

     * <p>Multi-plane Android YUV format</p>

     *

     * <p>This format is a generic YCbCr format, capable of describing any 4:2:0

     * chroma-subsampled planar or semiplanar buffer, with 8 bits per color

     * sample.</p>

     * chroma-subsampled planar or semiplanar buffer (but not fully interleaved),

     * with 8 bits per color sample.</p>

     *

     * <p>Images in this format are always represented by three separate buffers

     * of data, one for each color plane. Additional information always

     * accompanies the buffers, describing the row stride and the pixel stride

     * for each plane.</p>

     *

     * <p>The order of planes in the array returned by

     * {@link android.media.Image#getPlanes() Image#getPlanes()} is guaranteed such that

     * plane #0 is always Y, plane #1 is always U (Cb), and plane #2 is always V (Cr).</p>

     *

     * <p>The Y-plane is guaranteed not to be interleaved with the U/V planes

     * (in particular, pixel stride is always 1 in

     * {@link android.media.Image.Plane#getPixelStride() yPlane.getPixelStride()}).</p>

     *

     * <p>The U/V planes are guaranteed to have the same row stride and pixel stride

     * (in particular,

     * {@link android.media.Image.Plane#getRowStride() uPlane.getRowStride()}

     * == {@link android.media.Image.Plane#getRowStride() vPlane.getRowStride()} and

     * {@link android.media.Image.Plane#getPixelStride() uPlane.getPixelStride()}

     * == {@link android.media.Image.Plane#getPixelStride() vPlane.getPixelStride()};

     * ).</p>

     *

     * <p>For example, the {@link android.media.Image} object can provide data

     * in this format from a {@link android.hardware.camera2.CameraDevice}

     * through a {@link android.media.ImageReader} object.</p>