D_GTR1: Generalized Trowbridge-Reitz with gamma=1 Burley notes eq. 4

D_GTR1: Generalized Trowbridge-Reitz with gamma=1 Burley notes eq. 4

D_GTR2 Anisotropic: Anisotropic generalized Trowbridge-Reitz with gamma=2 Burley notes eq. 13

D_GTR2 Anisotropic: Anisotropic generalized Trowbridge-Reitz with gamma=2 Burley notes eq. 13

return whether the iterator is at end

@brief return whether value is an unsigned integer number @sa https://json.nlohmann.me/api/basic_json/is_number_unsigned/

! @brief determine system byte order @return true if and only if system's byte order is little endian @note from https://stackoverflow.com/a/1001328

max_size(const Alloc& a): Returns a.max_size() if possible. If not possible, returns std::numeric_limits<size_type>::max() / sizeof(value_type)

! @brief post-increment (it++) @pre The iterator is initialized; i.e. `m_object != nullptr`. */

! @brief post-decrement (it--) @pre The iterator is initialized; i.e. `m_object != nullptr`. */

PRECONDITION: not an end() iterator.

Span::rend() Returns a reverse iterator starting at the first element of this span.

optional::reset() Destroys the inner `T` value of an `phmap::optional` if one is present.

Sample a reflection direction the hemisphere oriented along n and spanned by v_x, v_y using the random samples in s

select_on_container_copy_construction(const Alloc& a): Returns a.select_on_container_copy_construction() if possible. If not possible, returns a.

traverse the layout to locate the nearest character to a display position

discard the oldest entry in the undo list

find the x/y location of a character, and remember info about the previous row in case we get a move-up event (for page up, we'll have to rescan)

canoncialize the selection so start <= end

create the png data from post-deflated data

this function is designed to support animated gifs, although stb_image doesn't support it two back is the image from two frames ago, used for a very s

decode one 64-entry block--

get some unsigned bits

set up the kernels

read 16bit value and convert to 24bit RGB