Aleph::CA::ca_gif_detail Namespace Reference

Classes
class	Bit_Writer
struct	Frame

Functions
void	put_le16 (std::ostream &out, const std::uint16_t value)
std::uint32_t	dist2 (const RGB8 a, const RGB8 b) noexcept
std::uint8_t	palette_index (Array< RGB8 > &palette, const RGB8 c)
std::uint8_t	lookup_palette_index (const Array< RGB8 > &palette, const RGB8 c) noexcept
	Read-only lookup variant: assumes the palette is already finalised (every colour either present or to be approximated by nearest match) and never mutates it.
unsigned	ceil_log2 (std::size_t n)
Array< std::uint8_t >	lzw_bytes (const Array< std::uint8_t > &indices, const unsigned min_code_size)
void	write_subblocks (std::ostream &out, const Array< std::uint8_t > &bytes)
Array< RGB8 >	build_palette (const Array< Frame > &frames)

Function Documentation

build_palette()

Array< RGB8 > Aleph::CA::ca_gif_detail::build_palette ( const Array< Frame > &  frames )

inline

Definition at line 226 of file ca-gif.H.

References Aleph::blossom_maximum_cardinality_matching(), palette_index(), and Aleph::Array< T >::reserve().

ceil_log2()

unsigned Aleph::CA::ca_gif_detail::ceil_log2 ( std::size_t  n )

inline

Definition at line 144 of file ca-gif.H.

dist2()

std::uint32_t Aleph::CA::ca_gif_detail::dist2 ( const RGB8  a, const RGB8  b  )

inlinenoexcept

Definition at line 86 of file ca-gif.H.

References Aleph::blossom_maximum_cardinality_matching().

Referenced by lookup_palette_index(), and palette_index().

lookup_palette_index()

std::uint8_t Aleph::CA::ca_gif_detail::lookup_palette_index ( const Array< RGB8 > &  palette, const RGB8  c  )

inlinenoexcept

Read-only lookup variant: assumes the palette is already finalised (every colour either present or to be approximated by nearest match) and never mutates it.

Used by the per-frame loop in write_gif so the palette does not need to be copied per frame.

Definition at line 123 of file ca-gif.H.

References Aleph::blossom_maximum_cardinality_matching(), and dist2().

lzw_bytes()

Array< std::uint8_t > Aleph::CA::ca_gif_detail::lzw_bytes ( const Array< std::uint8_t > &  indices, const unsigned  min_code_size  )

inline

Definition at line 183 of file ca-gif.H.

References Aleph::and, Aleph::blossom_maximum_cardinality_matching(), Aleph::CA::ca_gif_detail::Bit_Writer::finish(), and Aleph::CA::ca_gif_detail::Bit_Writer::write().

palette_index()

std::uint8_t Aleph::CA::ca_gif_detail::palette_index ( Array< RGB8 > &  palette, const RGB8  c  )

inline

Definition at line 94 of file ca-gif.H.

References Aleph::blossom_maximum_cardinality_matching(), and dist2().

Referenced by build_palette().

put_le16()

void Aleph::CA::ca_gif_detail::put_le16 ( std::ostream &  out, const std::uint16_t  value  )

inline

Definition at line 80 of file ca-gif.H.

References out, and value.

write_subblocks()

void Aleph::CA::ca_gif_detail::write_subblocks ( std::ostream &  out, const Array< std::uint8_t > &  bytes  )

inline

Definition at line 213 of file ca-gif.H.

References Aleph::Array< T >::base(), out, and Aleph::Array< T >::size().