'\" t
.\"     Title: SDL_GetRowStretchCode
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 0.3.1
.\"    Manual: Manual Pages
.\"    Source: SDL_stretch
.\"  Language: English
.\"
.TH "SDL_GETROWSTRETCHCOD" "3" "0\&.3\&.1" "SDL_stretch" "Manual Pages"
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.SH "NAME"
SDL_GetRowStretchCode, SDL_NewRowStretchCode \- (src/SDL_stretchcode\&.h)
.SH "SYNOPSIS"
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.ft B
.nf
 #include <SDL_stretch\&.h>
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.HP \w'extern\ unsigned\ char*\ SDL_GetRowStretchCode('u
.BI "extern unsigned char* SDL_GetRowStretchCode(void);"
.HP \w'extern\ unsigned\ char*\ SDL_NewRowStretchCode('u
.BI "extern unsigned char* SDL_NewRowStretchCode(unsigned\ size);"
.SH "DESCRIPTION"
.PP
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\&.
.PP
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\&.
.PP