NAME

       SDL_GetRowStretchCode, SDL_NewRowStretchCode - (src/SDL_stretchcode.h)

SYNOPSIS

        #include <SDL_stretch.h>

       extern unsigned char* SDL_GetRowStretchCode(void);

       extern unsigned char* SDL_NewRowStretchCode(unsigned size);

DESCRIPTION

       TheRowStretchCode is a shared buffer between Stretch-routines that use no extra buffer-argument. You
       should call SDL_SetRowStretchCode to fill this internal buffer and set a "call"-operation for your target
       cpu to execute this static buffer. That is done for effiency as the RowStretch is often called in a tight
       loop for each Row in a rectengular stretch and it is best to not use a variable argument with an indirect
       call or a function call that would build up a callframe and release that callframe later.

       If you do not need that effiency, use PutRowStretchCode and RunRowStretchCode which are also good in a
       multithreading environment. To allocate a new buffer for usage with Put/Run you can use the
       NewRowStretchCode routine which is also used on NX machines (e.g. AMD64) where the data segment is set to
       be not-executable (in that case it will allocate from heap and use mprotect). if the argument is 0 then a
       buffer of the default size is allocated. If the buffer allocation (or mprotect) fails it will return NULL
       and SDL_SetError.