SDL_GETROWSTRETCHCOD(3) Manual Pages SDL_GETROWSTRETCHCOD(3)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.
SDL_stretch 0.3.1 SDL_GETROWSTRETCHCOD(3)
Check Out this Related Man Page
SDL_SETROWSTRETCHCOD(3) Manual Pages SDL_SETROWSTRETCHCOD(3)NAME
SDL_SetRowStretchCode, SDL_PutRowStretchCode, SDL_RunRowStretchCode, SDL_StretchRow1, SDL_StretchRow2, SDL_StretchRow3, SDL_StretchRow4 -
(src/SDL_stretchcode.h)
SYNOPSIS
#include <SDL_stretch.h>
unsigned char* SDL_SetRowStretchCode(int src_w, int dst_w, int bpp);
unsigned char* SDL_PutRowStretchCode(unsigned char* buffer, int buflen, int src_w, int dst_w, int bpp);
void SDL_RunRowStretchCode(unsigned char* buffer, unsigned char* src, unsigned char* dst);
void SDL_StretchRow1(Uint8 *src, int src_w, Uint8 *dst, int dst_w);
void SDL_StretchRow2(Uint16 *src, int src_w, Uint16 *dst, int dst_w);
void SDL_StretchRow3(Uint8 *src, int src_w, Uint8 *dst, int dst_w);
void SDL_StretchRow4(Uint32 *src, int src_w, Uint32 *dst, int dst_w);
DESCRIPTION
The SetRowStretchCode is a wrapper around PutRowStretchCode that uses the Adress and Size of the shared SDL_TheRowStretchCode buffer. The
PutRowStretchCode will fill the given buffer with an assembler stream that should be called with SDL_RunRowStretchCode. The assembler
stream is usually faster as all the scale decisions are done in advance of the execution. This helps when a RunCode is done multiple times
with the same src_w/dst_w/bpp pair. All the pixel-get and pixel-set calls are unrolled in that buffer. Therefore, the buffer should be big
enough - as a rule of thumb use a buffer of size (src_w+dst_w)*5
If PutCode or SetCode fails, a NULL is returned and SDL_SetError. Otherwise, the start adress of the machine code buffer is returned, which
is also the input argument of PutCode and RunCode.
If SDL_SetRowStretchCode fails, the SDL_StretchRow1 function must be used instead. The SDL_StretchRow1 function and its cousins are
singular routines that work in a tight loop to scale a single row. The number specifies the byte-width of each pixel (it is not a
bit-width!).
SDL_stretch 0.3.1 SDL_SETROWSTRETCHCOD(3)
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