Mercurial > sdl-ios-xcode
annotate docs/html/sdlshowcursor.html @ 3880:74e828c64315 SDL-1.2
Fixed bug #292
I might be on crack here.
It looks like SDL_ConvertMono() in src/audio/SDL_audiocvt.c adds the left and
right channels of a stereo stream together, and clamps the new mono channel if
it would overflow.
Shouldn't it be dividing by 2 to average the two sample points instead of
clamping? Otherwise the mono sample point's volume doubles in the conversion.
This would also make the conversion faster, as it replaces two branches per
sample frame with a bitwise shift.
--ryan.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 24 Sep 2006 15:45:37 +0000 |
| parents | 355632dca928 |
| children |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_ShowCursor</TITLE | |
| 5 ><META | |
| 6 NAME="GENERATOR" | |
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ |
| 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_GetCursor" | |
| 17 HREF="sdlgetcursor.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_GL_LoadLibrary" | |
| 20 HREF="sdlglloadlibrary.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 | |
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31 SUMMARY="Header navigation table" |
| 0 | 32 WIDTH="100%" |
| 33 BORDER="0" | |
| 34 CELLPADDING="0" | |
| 35 CELLSPACING="0" | |
| 36 ><TR | |
| 37 ><TH | |
| 38 COLSPAN="3" | |
| 39 ALIGN="center" | |
| 40 >SDL Library Documentation</TH | |
| 41 ></TR | |
| 42 ><TR | |
| 43 ><TD | |
| 44 WIDTH="10%" | |
| 45 ALIGN="left" | |
| 46 VALIGN="bottom" | |
| 47 ><A | |
| 48 HREF="sdlgetcursor.html" | |
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49 ACCESSKEY="P" |
| 0 | 50 >Prev</A |
| 51 ></TD | |
| 52 ><TD | |
| 53 WIDTH="80%" | |
| 54 ALIGN="center" | |
| 55 VALIGN="bottom" | |
| 56 ></TD | |
| 57 ><TD | |
| 58 WIDTH="10%" | |
| 59 ALIGN="right" | |
| 60 VALIGN="bottom" | |
| 61 ><A | |
| 62 HREF="sdlglloadlibrary.html" | |
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63 ACCESSKEY="N" |
| 0 | 64 >Next</A |
| 65 ></TD | |
| 66 ></TR | |
| 67 ></TABLE | |
| 68 ><HR | |
| 69 ALIGN="LEFT" | |
| 70 WIDTH="100%"></DIV | |
| 71 ><H1 | |
| 72 ><A | |
| 73 NAME="SDLSHOWCURSOR" | |
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74 ></A |
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75 >SDL_ShowCursor</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN2615" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_ShowCursor -- Toggle whether or not the cursor is shown on the screen.</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN2618" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN2619" |
| 0 | 95 ></A |
| 96 ><P | |
| 97 ></P | |
| 98 ><PRE | |
| 99 CLASS="FUNCSYNOPSISINFO" | |
| 100 >#include "SDL.h"</PRE | |
| 101 ><P | |
| 102 ><CODE | |
| 103 ><CODE | |
| 104 CLASS="FUNCDEF" | |
| 105 >int <B | |
| 106 CLASS="FSFUNC" | |
| 107 >SDL_ShowCursor</B | |
| 108 ></CODE | |
| 109 >(int toggle);</CODE | |
| 110 ></P | |
| 111 ><P | |
| 112 ></P | |
| 113 ></DIV | |
| 114 ></DIV | |
| 115 ><DIV | |
| 116 CLASS="REFSECT1" | |
| 117 ><A | |
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118 NAME="AEN2625" |
| 0 | 119 ></A |
| 120 ><H2 | |
| 121 >Description</H2 | |
| 122 ><P | |
| 123 >Toggle whether or not the cursor is shown on the screen. Passing <TT | |
| 124 CLASS="LITERAL" | |
| 125 >SDL_ENABLE</TT | |
| 126 > displays the cursor and passing <TT | |
| 127 CLASS="LITERAL" | |
| 128 >SDL_DISABLE</TT | |
| 129 > hides it. The current state of the mouse cursor can be queried by passing <TT | |
| 130 CLASS="LITERAL" | |
| 131 >SDL_QUERY</TT | |
| 132 >, either <TT | |
| 133 CLASS="LITERAL" | |
| 134 >SDL_DISABLE</TT | |
| 135 > or <TT | |
| 136 CLASS="LITERAL" | |
| 137 >SDL_ENABLE</TT | |
| 138 > will be returned.</P | |
| 139 ><P | |
| 140 >The cursor starts off displayed, but can be turned off.</P | |
| 141 ></DIV | |
| 142 ><DIV | |
| 143 CLASS="REFSECT1" | |
| 144 ><A | |
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145 NAME="AEN2634" |
| 0 | 146 ></A |
| 147 ><H2 | |
| 148 >Return Value</H2 | |
| 149 ><P | |
| 150 >Returns the current state of the cursor.</P | |
| 151 ></DIV | |
| 152 ><DIV | |
| 153 CLASS="REFSECT1" | |
| 154 ><A | |
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155 NAME="AEN2637" |
| 0 | 156 ></A |
| 157 ><H2 | |
| 158 >See Also</H2 | |
| 159 ><P | |
| 160 ><A | |
| 161 HREF="sdlcreatecursor.html" | |
| 162 ><TT | |
| 163 CLASS="FUNCTION" | |
| 164 >SDL_CreateCursor</TT | |
| 165 ></A | |
| 166 >, | |
| 167 <A | |
| 168 HREF="sdlsetcursor.html" | |
| 169 ><TT | |
| 170 CLASS="FUNCTION" | |
| 171 >SDL_SetCursor</TT | |
| 172 ></A | |
| 173 ></P | |
| 174 ></DIV | |
| 175 ><DIV | |
| 176 CLASS="NAVFOOTER" | |
| 177 ><HR | |
| 178 ALIGN="LEFT" | |
| 179 WIDTH="100%"><TABLE | |
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180 SUMMARY="Footer navigation table" |
| 0 | 181 WIDTH="100%" |
| 182 BORDER="0" | |
| 183 CELLPADDING="0" | |
| 184 CELLSPACING="0" | |
| 185 ><TR | |
| 186 ><TD | |
| 187 WIDTH="33%" | |
| 188 ALIGN="left" | |
| 189 VALIGN="top" | |
| 190 ><A | |
| 191 HREF="sdlgetcursor.html" | |
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parents:
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192 ACCESSKEY="P" |
| 0 | 193 >Prev</A |
| 194 ></TD | |
| 195 ><TD | |
| 196 WIDTH="34%" | |
| 197 ALIGN="center" | |
| 198 VALIGN="top" | |
| 199 ><A | |
| 200 HREF="index.html" | |
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Updated SDL HTML documentation
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parents:
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changeset
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201 ACCESSKEY="H" |
| 0 | 202 >Home</A |
| 203 ></TD | |
| 204 ><TD | |
| 205 WIDTH="33%" | |
| 206 ALIGN="right" | |
| 207 VALIGN="top" | |
| 208 ><A | |
| 209 HREF="sdlglloadlibrary.html" | |
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210 ACCESSKEY="N" |
| 0 | 211 >Next</A |
| 212 ></TD | |
| 213 ></TR | |
| 214 ><TR | |
| 215 ><TD | |
| 216 WIDTH="33%" | |
| 217 ALIGN="left" | |
| 218 VALIGN="top" | |
| 219 >SDL_GetCursor</TD | |
| 220 ><TD | |
| 221 WIDTH="34%" | |
| 222 ALIGN="center" | |
| 223 VALIGN="top" | |
| 224 ><A | |
| 225 HREF="video.html" | |
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parents:
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226 ACCESSKEY="U" |
| 0 | 227 >Up</A |
| 228 ></TD | |
| 229 ><TD | |
| 230 WIDTH="33%" | |
| 231 ALIGN="right" | |
| 232 VALIGN="top" | |
| 233 >SDL_GL_LoadLibrary</TD | |
| 234 ></TR | |
| 235 ></TABLE | |
| 236 ></DIV | |
| 237 ></BODY | |
| 238 ></HTML | |
| 239 > |