view docs/man3/SDL_CreateMutex.3 @ 1543:98f9b16f565c

From: "Alex Volkov" Date: Thu, 10 Nov 2005 21:53:40 -0500 Subject: [SDL] BUG[?]: 32bpp RGBA->RGB colorkey blit, no SDL_SRCALPHA It seems there is either a documentation vs. reality mismatch or a real bug in SDL_blit_N.c:BlitNtoNKey(). The exact blit in question is a 32bpp RGBA->RGB, where RGBA has SDL_COLORKEY and *no* SDL_SRCALPHA flags. The doc in SDL_video.h states: * RGBA->RGB: * SDL_SRCALPHA not set: * copy RGB. * if SDL_SRCCOLORKEY set, only copy the pixels matching the * RGB values of the source colour key, ignoring alpha in the * comparison. BlitNtoNKey(), however, forgets to "ignore alpha in the comparison". The documentation makes perfect sense, so I think it is the code that is faulty. The attached patch corrects the code.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 15 Mar 2006 15:43:15 +0000
parents e5bc29de3f0a
children 546f7c1eb755
line wrap: on
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.TH "SDL_CreateMutex" "3" "Tue 11 Sep 2001, 23:00" "SDL" "SDL API Reference" 
.SH "NAME"
SDL_CreateMutex\- Create a mutex
.SH "SYNOPSIS"
.PP
\fB#include "SDL\&.h"
#include "SDL_thread\&.h"
.sp
\fBSDL_mutex *\fBSDL_CreateMutex\fP\fR(\fBvoid\fR);
.SH "DESCRIPTION"
.PP
Create a new, unlocked mutex\&.
.SH "EXAMPLES"
.PP
.nf
\f(CWSDL_mutex *mut;

mut=SDL_CreateMutex();
\&.
\&.
if(SDL_mutexP(mut)==-1){
  fprintf(stderr, "Couldn\&'t lock mutex
");
  exit(-1);
}
\&.
/* Do stuff while mutex is locked */
\&.
\&.
if(SDL_mutexV(mut)==-1){
  fprintf(stderr, "Couldn\&'t unlock mutex
");
  exit(-1);
}

SDL_DestroyMutex(mut);
\fR
.fi
.PP
.SH "SEE ALSO"
.PP
\fI\fBSDL_mutexP\fP\fR, \fI\fBSDL_mutexV\fP\fR, \fI\fBSDL_DestroyMutex\fP\fR
...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:00