Function libwebp::WebPDecodeRGBAInto

pub fn WebPDecodeRGBAInto(
    data: &[u8],
    output_buffer: &mut [u8],
    output_stride: u32
) -> Result<(), WebPSimpleError>

Decodes WebP images pointed to by data and writes RGBA samples to output_buffer.

The parameter ‘output_stride’ specifies the distance (in bytes) between scanlines. Hence, output_buffer.len() is expected to be at least output_stride x picture-height.

The ordering of samples in memory is R, G, B, A, R, G, B, A… in scan order (endian-independent).

Errors

Returns Err if data doesn’t contain a valid WebP image, or output_buffer is too small.

Variants

• WebPDecodeRGBAInto
• WebPDecodeARGBInto
• WebPDecodeBGRAInto
• WebPDecodeRGBInto
• WebPDecodeBGRInto

Examples

use libwebp::{WebPGetInfo, WebPDecodeRGBAInto};

let data: &[u8];

let (width, height) = WebPGetInfo(data).expect("Invalid WebP header");
let stride = width * 4;
let mut buf = vec![0; stride as usize * height as usize];
WebPDecodeRGBAInto(data, &mut buf, stride).expect("Invalid WebP data");
eprintln!(
    "top-left pixel: rgba({}, {}, {}, {})",
    buf[0],
    buf[1],
    buf[2],
    buf[3] as f64 / 255.0,
)