Function libwebp::WebPDecodeYUV

pub fn WebPDecodeYUV(
    data: &[u8]
) -> Result<(u32, u32, u32, u32, WebpYuvBox), WebPSimpleError>

Decodes WebP images pointed to by data to Y’UV format¹.

¹ Also named Y’CbCr. See: http://en.wikipedia.org/wiki/YCbCr

Return value

It retuns a tuple with the following data in this order:

• width
• height
• stride
• uv_stride
• a WebpYuvBox which contains the pointers to the Y, U and V planes.

The dimension of the U and V planes are both (width + 1) / 2 and (height + 1)/ 2. The Y buffer has a stride returned as stride, while U and V have a common stride returned as uv_stride.

Errors

Returns Err if data doesn’t contain a valid WebP image.

Examples

use libwebp::WebPDecodeYUV;

let data: &[u8];

let (width, height, stride, uv_stride, buf) =
    WebPDecodeYUV(data).expect("Invalid WebP data");
assert!(width <= stride);
assert!((width + 1) / 2 <= uv_stride);
assert_eq!(buf.y().len(), stride as usize * height as usize);
assert_eq!(buf.u().len(), uv_stride as usize * ((height as usize + 1) / 2));
assert_eq!(buf.v().len(), uv_stride as usize * ((height as usize + 1) / 2));
eprintln!(
    "top-left pixel: yuv({}, {}, {})",
    buf.y()[0],
    buf.u()[0],
    buf.v()[0],
)

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