pub fn block_count(jpeg: &[u8]) -> Result<Vec<usize>, DctError>Expand description
Return the number of 8×8 DCT blocks per component in a JPEG.
The returned Vec has one entry per component (in SOF order). Useful
for determining how many blocks are available before calling
read_coefficients.
§Errors
Returns DctError if the input is not a supported baseline JPEG.