Mercurial > sdl-ios-xcode
annotate docs/html/sdlfreesurface.html @ 765:4c2ba6161939
Editors Note: The original patch was modified to use SDL_Delay() instead of
nanosleep because nanosleep may not be portable to all systems
using SDL with the ALSA backend. This may be a moot point with
the switch to blocking writes anyway...
Date: Sat, 27 Dec 2003 21:47:36 +0100
From: Michel Daenzer
To: Debian Bug Tracking System
Subject: [SDL] Bug#225252: [PATCH] ALSA fixes
Package: libsdl1.2debian-all
Version: 1.2.6-2
Severity: normal
Tags: patch
For SDL 1.2.6, the ALSA backend was changed to call snd_pcm_open() with
SND_PCM_NONBLOCK. That's a good idea per se, however, it causes high CPU
usage, interrupted sound and stuttering in some games here. Taking a nanosleep
whenever snd_pcm_writei() returns -EAGAIN fixes this, but I think it's more
efficient to use blocking mode for the actual sound playback. Feedback from the
SDL and ALSA lists appreciated.
The patch also fixes the default ALSA device to be used.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 04 Jan 2004 15:40:50 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_FreeSurface</TITLE | |
| 5 ><META | |
| 6 NAME="GENERATOR" | |
|
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.64 |
| 0 | 8 "><LINK |
| 9 REL="HOME" | |
| 10 TITLE="SDL Library Documentation" | |
| 11 HREF="index.html"><LINK | |
| 12 REL="UP" | |
| 13 TITLE="Video" | |
| 14 HREF="video.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL_CreateRGBSurfaceFrom" | |
| 17 HREF="sdlcreatergbsurfacefrom.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_LockSurface" | |
| 20 HREF="sdllocksurface.html"></HEAD | |
| 21 ><BODY | |
| 22 CLASS="REFENTRY" | |
| 23 BGCOLOR="#FFF8DC" | |
| 24 TEXT="#000000" | |
| 25 LINK="#0000ee" | |
| 26 VLINK="#551a8b" | |
| 27 ALINK="#ff0000" | |
| 28 ><DIV | |
| 29 CLASS="NAVHEADER" | |
| 30 ><TABLE | |
| 31 WIDTH="100%" | |
| 32 BORDER="0" | |
| 33 CELLPADDING="0" | |
| 34 CELLSPACING="0" | |
| 35 ><TR | |
| 36 ><TH | |
| 37 COLSPAN="3" | |
| 38 ALIGN="center" | |
| 39 >SDL Library Documentation</TH | |
| 40 ></TR | |
| 41 ><TR | |
| 42 ><TD | |
| 43 WIDTH="10%" | |
| 44 ALIGN="left" | |
| 45 VALIGN="bottom" | |
| 46 ><A | |
| 47 HREF="sdlcreatergbsurfacefrom.html" | |
| 48 >Prev</A | |
| 49 ></TD | |
| 50 ><TD | |
| 51 WIDTH="80%" | |
| 52 ALIGN="center" | |
| 53 VALIGN="bottom" | |
| 54 ></TD | |
| 55 ><TD | |
| 56 WIDTH="10%" | |
| 57 ALIGN="right" | |
| 58 VALIGN="bottom" | |
| 59 ><A | |
| 60 HREF="sdllocksurface.html" | |
| 61 >Next</A | |
| 62 ></TD | |
| 63 ></TR | |
| 64 ></TABLE | |
| 65 ><HR | |
| 66 ALIGN="LEFT" | |
| 67 WIDTH="100%"></DIV | |
| 68 ><H1 | |
| 69 ><A | |
| 70 NAME="SDLFREESURFACE" | |
| 71 >SDL_FreeSurface</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
|
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76 NAME="AEN1509" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
|
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80 >SDL_FreeSurface -- Frees (deletes) a SDL_Surface</DIV |
| 0 | 81 ><DIV |
| 82 CLASS="REFSYNOPSISDIV" | |
| 83 ><A | |
|
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84 NAME="AEN1512" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Synopsis</H2 | |
| 88 ><DIV | |
| 89 CLASS="FUNCSYNOPSIS" | |
| 90 ><A | |
|
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91 NAME="AEN1513" |
| 0 | 92 ></A |
| 93 ><P | |
| 94 ></P | |
| 95 ><PRE | |
| 96 CLASS="FUNCSYNOPSISINFO" | |
| 97 >#include "SDL.h"</PRE | |
| 98 ><P | |
| 99 ><CODE | |
| 100 ><CODE | |
| 101 CLASS="FUNCDEF" | |
| 102 >void <B | |
| 103 CLASS="FSFUNC" | |
| 104 >SDL_FreeSurface</B | |
| 105 ></CODE | |
| 106 >(SDL_Surface *surface);</CODE | |
| 107 ></P | |
| 108 ><P | |
| 109 ></P | |
| 110 ></DIV | |
| 111 ></DIV | |
| 112 ><DIV | |
| 113 CLASS="REFSECT1" | |
| 114 ><A | |
|
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115 NAME="AEN1519" |
| 0 | 116 ></A |
| 117 ><H2 | |
| 118 >Description</H2 | |
| 119 ><P | |
| 120 >Frees the resources used by a previously created <SPAN | |
| 121 CLASS="STRUCTNAME" | |
| 122 >SDL_Surface</SPAN | |
| 123 >. If the surface was created using | |
| 124 <A | |
| 125 HREF="sdlcreatergbsurfacefrom.html" | |
| 126 >SDL_CreateRGBSurfaceFrom</A | |
| 127 > then the pixel data is not freed.</P | |
| 128 ></DIV | |
| 129 ><DIV | |
| 130 CLASS="REFSECT1" | |
| 131 ><A | |
|
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132 NAME="AEN1524" |
| 0 | 133 ></A |
| 134 ><H2 | |
| 135 >See Also</H2 | |
| 136 ><P | |
| 137 ><A | |
| 138 HREF="sdlcreatergbsurface.html" | |
| 139 ><TT | |
| 140 CLASS="FUNCTION" | |
| 141 >SDL_CreateRGBSurface</TT | |
| 142 ></A | |
| 143 > | |
| 144 <A | |
| 145 HREF="sdlcreatergbsurfacefrom.html" | |
| 146 ><TT | |
| 147 CLASS="FUNCTION" | |
| 148 >SDL_CreateRGBSurfaceFrom</TT | |
| 149 ></A | |
| 150 ></P | |
| 151 ></DIV | |
| 152 ><DIV | |
| 153 CLASS="NAVFOOTER" | |
| 154 ><HR | |
| 155 ALIGN="LEFT" | |
| 156 WIDTH="100%"><TABLE | |
| 157 WIDTH="100%" | |
| 158 BORDER="0" | |
| 159 CELLPADDING="0" | |
| 160 CELLSPACING="0" | |
| 161 ><TR | |
| 162 ><TD | |
| 163 WIDTH="33%" | |
| 164 ALIGN="left" | |
| 165 VALIGN="top" | |
| 166 ><A | |
| 167 HREF="sdlcreatergbsurfacefrom.html" | |
| 168 >Prev</A | |
| 169 ></TD | |
| 170 ><TD | |
| 171 WIDTH="34%" | |
| 172 ALIGN="center" | |
| 173 VALIGN="top" | |
| 174 ><A | |
| 175 HREF="index.html" | |
| 176 >Home</A | |
| 177 ></TD | |
| 178 ><TD | |
| 179 WIDTH="33%" | |
| 180 ALIGN="right" | |
| 181 VALIGN="top" | |
| 182 ><A | |
| 183 HREF="sdllocksurface.html" | |
| 184 >Next</A | |
| 185 ></TD | |
| 186 ></TR | |
| 187 ><TR | |
| 188 ><TD | |
| 189 WIDTH="33%" | |
| 190 ALIGN="left" | |
| 191 VALIGN="top" | |
| 192 >SDL_CreateRGBSurfaceFrom</TD | |
| 193 ><TD | |
| 194 WIDTH="34%" | |
| 195 ALIGN="center" | |
| 196 VALIGN="top" | |
| 197 ><A | |
| 198 HREF="video.html" | |
| 199 >Up</A | |
| 200 ></TD | |
| 201 ><TD | |
| 202 WIDTH="33%" | |
| 203 ALIGN="right" | |
| 204 VALIGN="top" | |
| 205 >SDL_LockSurface</TD | |
| 206 ></TR | |
| 207 ></TABLE | |
| 208 ></DIV | |
| 209 ></BODY | |
| 210 ></HTML | |
| 211 > |