Mercurial > sdl-ios-xcode
annotate docs/html/sdlrect.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_Rect</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_GLattr" | |
| 17 HREF="sdlglattr.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_Color" | |
| 20 HREF="sdlcolor.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="sdlglattr.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="sdlcolor.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="SDLRECT" | |
| 71 >SDL_Rect</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
|
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76 NAME="AEN2662" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_Rect -- Defines a rectangular area</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSECT1" | |
| 83 ><A | |
|
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84 NAME="AEN2665" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Structure Definition</H2 | |
| 88 ><PRE | |
| 89 CLASS="PROGRAMLISTING" | |
| 90 >typedef struct{ | |
| 91 Sint16 x, y; | |
| 92 Uint16 w, h; | |
| 93 } SDL_Rect;</PRE | |
| 94 ></DIV | |
| 95 ><DIV | |
| 96 CLASS="REFSECT1" | |
| 97 ><A | |
|
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98 NAME="AEN2668" |
| 0 | 99 ></A |
| 100 ><H2 | |
| 101 >Structure Data</H2 | |
| 102 ><DIV | |
| 103 CLASS="INFORMALTABLE" | |
| 104 ><A | |
|
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105 NAME="AEN2670" |
| 0 | 106 ></A |
| 107 ><P | |
| 108 ></P | |
| 109 ><TABLE | |
| 110 BORDER="0" | |
| 111 CLASS="CALSTABLE" | |
| 112 ><TBODY | |
| 113 ><TR | |
| 114 ><TD | |
| 115 ALIGN="LEFT" | |
| 116 VALIGN="TOP" | |
| 117 ><TT | |
| 118 CLASS="STRUCTFIELD" | |
| 119 ><I | |
| 120 >x, y</I | |
| 121 ></TT | |
| 122 ></TD | |
| 123 ><TD | |
| 124 ALIGN="LEFT" | |
| 125 VALIGN="TOP" | |
| 126 >Position of the upper-left corner of the rectangle</TD | |
| 127 ></TR | |
| 128 ><TR | |
| 129 ><TD | |
| 130 ALIGN="LEFT" | |
| 131 VALIGN="TOP" | |
| 132 ><TT | |
| 133 CLASS="STRUCTFIELD" | |
| 134 ><I | |
| 135 >w, h</I | |
| 136 ></TT | |
| 137 ></TD | |
| 138 ><TD | |
| 139 ALIGN="LEFT" | |
| 140 VALIGN="TOP" | |
| 141 >The width and height of the rectangle</TD | |
| 142 ></TR | |
| 143 ></TBODY | |
| 144 ></TABLE | |
| 145 ><P | |
| 146 ></P | |
| 147 ></DIV | |
| 148 ></DIV | |
| 149 ><DIV | |
| 150 CLASS="REFSECT1" | |
| 151 ><A | |
|
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152 NAME="AEN2681" |
| 0 | 153 ></A |
| 154 ><H2 | |
| 155 >Description</H2 | |
| 156 ><P | |
| 157 >A <SPAN | |
| 158 CLASS="STRUCTNAME" | |
| 159 >SDL_Rect</SPAN | |
| 160 > defines a rectangular area of pixels. It is used by <A | |
| 161 HREF="sdlblitsurface.html" | |
| 162 ><TT | |
| 163 CLASS="FUNCTION" | |
| 164 >SDL_BlitSurface</TT | |
| 165 ></A | |
| 166 > to define blitting regions and by several other video functions.</P | |
| 167 ></DIV | |
| 168 ><DIV | |
| 169 CLASS="REFSECT1" | |
| 170 ><A | |
|
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171 NAME="AEN2687" |
| 0 | 172 ></A |
| 173 ><H2 | |
| 174 >See Also</H2 | |
| 175 ><P | |
| 176 ><A | |
| 177 HREF="sdlblitsurface.html" | |
| 178 ><TT | |
| 179 CLASS="FUNCTION" | |
| 180 >SDL_BlitSurface</TT | |
| 181 ></A | |
| 182 >, | |
| 183 <A | |
| 184 HREF="sdlupdaterect.html" | |
| 185 ><TT | |
| 186 CLASS="FUNCTION" | |
| 187 >SDL_UpdateRect</TT | |
| 188 ></A | |
| 189 ></P | |
| 190 ></DIV | |
| 191 ><DIV | |
| 192 CLASS="NAVFOOTER" | |
| 193 ><HR | |
| 194 ALIGN="LEFT" | |
| 195 WIDTH="100%"><TABLE | |
| 196 WIDTH="100%" | |
| 197 BORDER="0" | |
| 198 CELLPADDING="0" | |
| 199 CELLSPACING="0" | |
| 200 ><TR | |
| 201 ><TD | |
| 202 WIDTH="33%" | |
| 203 ALIGN="left" | |
| 204 VALIGN="top" | |
| 205 ><A | |
| 206 HREF="sdlglattr.html" | |
| 207 >Prev</A | |
| 208 ></TD | |
| 209 ><TD | |
| 210 WIDTH="34%" | |
| 211 ALIGN="center" | |
| 212 VALIGN="top" | |
| 213 ><A | |
| 214 HREF="index.html" | |
| 215 >Home</A | |
| 216 ></TD | |
| 217 ><TD | |
| 218 WIDTH="33%" | |
| 219 ALIGN="right" | |
| 220 VALIGN="top" | |
| 221 ><A | |
| 222 HREF="sdlcolor.html" | |
| 223 >Next</A | |
| 224 ></TD | |
| 225 ></TR | |
| 226 ><TR | |
| 227 ><TD | |
| 228 WIDTH="33%" | |
| 229 ALIGN="left" | |
| 230 VALIGN="top" | |
| 231 >SDL_GLattr</TD | |
| 232 ><TD | |
| 233 WIDTH="34%" | |
| 234 ALIGN="center" | |
| 235 VALIGN="top" | |
| 236 ><A | |
| 237 HREF="video.html" | |
| 238 >Up</A | |
| 239 ></TD | |
| 240 ><TD | |
| 241 WIDTH="33%" | |
| 242 ALIGN="right" | |
| 243 VALIGN="top" | |
| 244 >SDL_Color</TD | |
| 245 ></TR | |
| 246 ></TABLE | |
| 247 ></DIV | |
| 248 ></BODY | |
| 249 ></HTML | |
| 250 > |