Mercurial > sdl-ios-xcode
annotate docs/html/sdlgetcliprect.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_GetClipRect</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_SetClipRect" | |
| 17 HREF="sdlsetcliprect.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_ConvertSurface" | |
| 20 HREF="sdlconvertsurface.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="sdlsetcliprect.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="sdlconvertsurface.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="SDLGETCLIPRECT" | |
| 71 >SDL_GetClipRect</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
|
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76 NAME="AEN1846" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_GetClipRect -- Gets the clipping rectangle for a surface.</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSYNOPSISDIV" | |
| 83 ><A | |
|
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84 NAME="AEN1849" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Synopsis</H2 | |
| 88 ><DIV | |
| 89 CLASS="FUNCSYNOPSIS" | |
| 90 ><A | |
|
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91 NAME="AEN1850" |
| 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_GetClipRect</B | |
| 105 ></CODE | |
| 106 >(SDL_Surface *surface, SDL_Rect *rect);</CODE | |
| 107 ></P | |
| 108 ><P | |
| 109 ></P | |
| 110 ></DIV | |
| 111 ></DIV | |
| 112 ><DIV | |
| 113 CLASS="REFSECT1" | |
| 114 ><A | |
|
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115 NAME="AEN1856" |
| 0 | 116 ></A |
| 117 ><H2 | |
| 118 >Description</H2 | |
| 119 ><P | |
| 120 >Gets the clipping rectangle for a surface. When this surface is the | |
| 121 destination of a blit, only the area within the clip rectangle is | |
| 122 drawn into.</P | |
| 123 ><P | |
| 124 >The rectangle pointed to by <TT | |
| 125 CLASS="PARAMETER" | |
| 126 ><I | |
| 127 >rect</I | |
| 128 ></TT | |
| 129 > will be | |
| 130 filled with the clipping rectangle of the surface.</P | |
| 131 ></DIV | |
| 132 ><DIV | |
| 133 CLASS="REFSECT1" | |
| 134 ><A | |
|
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135 NAME="AEN1861" |
| 0 | 136 ></A |
| 137 ><H2 | |
| 138 >See Also</H2 | |
| 139 ><P | |
| 140 ><A | |
| 141 HREF="sdlsetcliprect.html" | |
| 142 ><TT | |
| 143 CLASS="FUNCTION" | |
| 144 >SDL_SetClipRect</TT | |
| 145 ></A | |
| 146 >, | |
| 147 <A | |
| 148 HREF="sdlblitsurface.html" | |
| 149 ><TT | |
| 150 CLASS="FUNCTION" | |
| 151 >SDL_BlitSurface</TT | |
| 152 ></A | |
| 153 >, | |
| 154 <A | |
| 155 HREF="sdlsurface.html" | |
| 156 ><SPAN | |
| 157 CLASS="STRUCTNAME" | |
| 158 >SDL_Surface</SPAN | |
| 159 ></A | |
| 160 ></P | |
| 161 ></DIV | |
| 162 ><DIV | |
| 163 CLASS="NAVFOOTER" | |
| 164 ><HR | |
| 165 ALIGN="LEFT" | |
| 166 WIDTH="100%"><TABLE | |
| 167 WIDTH="100%" | |
| 168 BORDER="0" | |
| 169 CELLPADDING="0" | |
| 170 CELLSPACING="0" | |
| 171 ><TR | |
| 172 ><TD | |
| 173 WIDTH="33%" | |
| 174 ALIGN="left" | |
| 175 VALIGN="top" | |
| 176 ><A | |
| 177 HREF="sdlsetcliprect.html" | |
| 178 >Prev</A | |
| 179 ></TD | |
| 180 ><TD | |
| 181 WIDTH="34%" | |
| 182 ALIGN="center" | |
| 183 VALIGN="top" | |
| 184 ><A | |
| 185 HREF="index.html" | |
| 186 >Home</A | |
| 187 ></TD | |
| 188 ><TD | |
| 189 WIDTH="33%" | |
| 190 ALIGN="right" | |
| 191 VALIGN="top" | |
| 192 ><A | |
| 193 HREF="sdlconvertsurface.html" | |
| 194 >Next</A | |
| 195 ></TD | |
| 196 ></TR | |
| 197 ><TR | |
| 198 ><TD | |
| 199 WIDTH="33%" | |
| 200 ALIGN="left" | |
| 201 VALIGN="top" | |
| 202 >SDL_SetClipRect</TD | |
| 203 ><TD | |
| 204 WIDTH="34%" | |
| 205 ALIGN="center" | |
| 206 VALIGN="top" | |
| 207 ><A | |
| 208 HREF="video.html" | |
| 209 >Up</A | |
| 210 ></TD | |
| 211 ><TD | |
| 212 WIDTH="33%" | |
| 213 ALIGN="right" | |
| 214 VALIGN="top" | |
| 215 >SDL_ConvertSurface</TD | |
| 216 ></TR | |
| 217 ></TABLE | |
| 218 ></DIV | |
| 219 ></BODY | |
| 220 ></HTML | |
| 221 > |