Struct IDCTDSPContext

#[repr(C)]
pub struct IDCTDSPContext {
    pub put_pixels_clamped: Option<unsafe extern "C" fn(block: *const i16, pixels: *mut u8, line_size: isize)>,
    pub put_signed_pixels_clamped: Option<unsafe extern "C" fn(block: *const i16, pixels: *mut u8, line_size: isize)>,
    pub add_pixels_clamped: Option<unsafe extern "C" fn(block: *const i16, pixels: *mut u8, line_size: isize)>,
    pub idct: Option<unsafe extern "C" fn(block: *mut i16)>,
    pub idct_put: Option<unsafe extern "C" fn(dest: *mut u8, line_size: isize, block: *mut i16)>,
    pub idct_add: Option<unsafe extern "C" fn(dest: *mut u8, line_size: isize, block: *mut i16)>,
    pub idct_permutation: [u8; 64],
    pub perm_type: idct_permutation_type,
    pub mpeg4_studio_profile: c_int,
}

Fields

put_pixels_clamped: Option<unsafe extern "C" fn(block: *const i16, pixels: *mut u8, line_size: isize)>

put_signed_pixels_clamped: Option<unsafe extern "C" fn(block: *const i16, pixels: *mut u8, line_size: isize)>

add_pixels_clamped: Option<unsafe extern "C" fn(block: *const i16, pixels: *mut u8, line_size: isize)>

idct: Option<unsafe extern "C" fn(block: *mut i16)>

idct_put: Option<unsafe extern "C" fn(dest: *mut u8, line_size: isize, block: *mut i16)>

block -> idct -> clip to unsigned 8 bit -> dest. (-1392, 0, 0, …) -> idct -> (-174, -174, …) -> put -> (0, 0, …) @param line_size size in bytes of a horizontal line of dest

idct_add: Option<unsafe extern "C" fn(dest: *mut u8, line_size: isize, block: *mut i16)>

block -> idct -> add dest -> clip to unsigned 8 bit -> dest. @param line_size size in bytes of a horizontal line of dest

idct_permutation: [u8; 64]

IDCT input permutation. Several optimized IDCTs need a permutated input (relative to the normal order of the reference IDCT). This permutation must be performed before the idct_put/add. Note, normally this can be merged with the zigzag/alternate scan
An example to avoid confusion:

• (->decode coeffs -> zigzag reorder -> dequant -> reference IDCT -> …)
• (x -> reference DCT -> reference IDCT -> x)
• (x -> reference DCT -> simple_mmx_perm = idct_permutation -> simple_idct_mmx -> x)
• (-> decode coeffs -> zigzag reorder -> simple_mmx_perm -> dequant -> simple_idct_mmx -> …)

perm_type: idct_permutation_type

mpeg4_studio_profile: c_int

Trait Implementations

impl Clone for IDCTDSPContext

fn clone(&self) -> IDCTDSPContext

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for IDCTDSPContext