Struct IDCTDSPContext

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#[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, }

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§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§

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impl Clone for IDCTDSPContext

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fn clone(&self) -> IDCTDSPContext

Returns a copy of the value. Read more
1.0.0 · Source§

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

Performs copy-assignment from source. Read more
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impl Copy for IDCTDSPContext

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unsafe fn clone_to_uninit(&self, dst: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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Calls U::from(self).

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