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-@node Functions
-@chapter Functions
-
-The following functions are available in @command{libcolour}:
-
-@table @code
-@item int libcolour_convert(const libcolour_colour_t* restrict, libcolour_colour_t* restrict)
-Colour space and colour model conversion.
-Described in @ref{Colour Spaces}.
-
-@item double libcolour_srgb_encode(double)
-Apply the sRGB transfer function.
-Described in @ref{sRGB}.
-
-@item double libcolour_srgb_decode(double)
-Unapply the sRGB transfer function.
-Described in @ref{sRGB}.
-
-@item int libcolour_delta_e(const libcolour_colour_t*, const libcolour_colour_t*, double*)
-Calculates the @math{\Delta E^*_{ab}} distance
-(the distance in CIE L*a*b*) of two colours,
-and outputs it to the last parameter.
-Returns 0 on success and @math{-1} one error.
-This function fails if and only if
-@code{libcolour_convert} fails.
-
-@item int libcolour_proper(libcolour_colour_t*)
-Sets any member or submember that may be
-incorrectly set. Returns 0 on success, and
-@math{-1} on error. On error @code{errno}
-set appropriately. Error is only possible
-is there is something wrong with the described
-colour space that cannot be fixed.
-
-@item int libcolour_get_rgb_colour_space(libcolour_rgb_t*, libcolour_rgb_colour_space_t)
-Selects RGB colour space.
-Described in @ref{RGB}.
-
-@item size_t libcolour_marshal(const libcolour_colour_t*, void*)
-Store a colour into a buffer, and returns the number
-of bytes written. If @code{NULL} is given instead of
-a buffer, the number of bytes that would have been
-written is returned.
-
-This function will always write an @code{int} that
-is used to identify the version of @command{libcolour}
-so it can be decoded by future versions.
-
-In addition to this @code{int}, all the content of
-the structure is copied, so uninitialised values
-can be copied. However, it will never copy more than
-the size of the structure used to represent colours
-with used colour model. For example, is the @code{.model}
-member if the colour is set to @code{LIBCOLOUR_SRGB},
-no more than @code{sizeof(libcolour_srgb_t)} is written
-in addition to the initial @code{int}. If the value
-of @code{.model} is invalid, 0 is returned and
-@code{errno} is set to @code{EINVAL}.
-
-The written data is machine architecture specific.
-
-@item size_t libcolour_unmarshal(libcolour_colour_t*, const void*)
-Restores a colour from a buffer, and returns the number
-of bytes read. If @code{NULL} is given instead of
-an output pointer for the colour, the number of bytes
-that would have been read is returned.
-
-If the stored @code{int} at the beginning does
-not match a recognised version of @command{libcolour},
-0 is returned and errno is set to @code{EINVAL}, this
-also happens if the stored colour does not used
-a recognised colour model.
-
-If the stored colour uses a custom (not pre-defined)
-RGB colour space with custom a transfer function, the
-user must set them after calling @code{libcolour_unmarshal}.
-
-@end table
-