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

! @param[in] j JSON value to serialize @pre j.type() == value_t::object */

! @param[in] j JSON value to serialize */

! @param[in] j JSON value to serialize */

! @param[in] j JSON value to serialize @param[in] use_count whether to use '#' prefixes (optimized format) @param[in] use_type wheth

Finds the smallest interval of free memory in the GPUMemoryArena that's large enough to hold the requested number of bytes. Then allocates that memory

! @brief access specified array element with bounds checking Returns a reference to the element at specified location @a idx, with bounds