Mercurial > sdl-ios-xcode
annotate docs/html/sdlupdaterect.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 |
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| rev | line source |
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| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_UpdateRect</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_SetVideoMode" | |
| 17 HREF="sdlsetvideomode.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_UpdateRects" | |
| 20 HREF="sdlupdaterects.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="sdlsetvideomode.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="sdlupdaterects.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="SDLUPDATERECT" | |
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74 ></A |
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75 >SDL_UpdateRect</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN1355" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_UpdateRect -- Makes sure the given area is updated on the given screen.</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN1358" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN1359" |
| 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 >void <B | |
| 106 CLASS="FSFUNC" | |
| 107 >SDL_UpdateRect</B | |
| 108 ></CODE | |
| 109 >(SDL_Surface *screen, Sint32 x, Sint32 y, Sint32 w, Sint32 h);</CODE | |
| 110 ></P | |
| 111 ><P | |
| 112 ></P | |
| 113 ></DIV | |
| 114 ></DIV | |
| 115 ><DIV | |
| 116 CLASS="REFSECT1" | |
| 117 ><A | |
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118 NAME="AEN1365" |
| 0 | 119 ></A |
| 120 ><H2 | |
| 121 >Description</H2 | |
| 122 ><P | |
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123 >Makes sure the given area is updated on the given screen. The rectangle must |
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124 be confined within the screen boundaries (no clipping is done).</P |
| 0 | 125 ><P |
| 126 >If '<TT | |
| 127 CLASS="PARAMETER" | |
| 128 ><I | |
| 129 >x</I | |
| 130 ></TT | |
| 131 >', '<TT | |
| 132 CLASS="PARAMETER" | |
| 133 ><I | |
| 134 >y</I | |
| 135 ></TT | |
| 136 >', '<TT | |
| 137 CLASS="PARAMETER" | |
| 138 ><I | |
| 139 >w</I | |
| 140 ></TT | |
| 141 >' | |
| 142 and '<TT | |
| 143 CLASS="PARAMETER" | |
| 144 ><I | |
| 145 >h</I | |
| 146 ></TT | |
| 147 >' are all 0, | |
| 148 <TT | |
| 149 CLASS="FUNCTION" | |
| 150 >SDL_UpdateRect</TT | |
| 151 > will update the | |
| 152 entire screen.</P | |
| 153 ><P | |
| 154 >This function should not be called while '<TT | |
| 155 CLASS="PARAMETER" | |
| 156 ><I | |
| 157 >screen</I | |
| 158 ></TT | |
| 159 >' is | |
| 160 <A | |
| 161 HREF="sdllocksurface.html" | |
| 162 >locked</A | |
| 163 >.</P | |
| 164 ></DIV | |
| 165 ><DIV | |
| 166 CLASS="REFSECT1" | |
| 167 ><A | |
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168 NAME="AEN1377" |
| 0 | 169 ></A |
| 170 ><H2 | |
| 171 >See Also</H2 | |
| 172 ><P | |
| 173 ><A | |
| 174 HREF="sdlupdaterects.html" | |
| 175 ><TT | |
| 176 CLASS="FUNCTION" | |
| 177 >SDL_UpdateRects</TT | |
| 178 ></A | |
| 179 >, | |
| 180 <A | |
| 181 HREF="sdlrect.html" | |
| 182 ><SPAN | |
| 183 CLASS="STRUCTNAME" | |
| 184 >SDL_Rect</SPAN | |
| 185 ></A | |
| 186 >, | |
| 187 <A | |
| 188 HREF="sdlsurface.html" | |
| 189 ><SPAN | |
| 190 CLASS="STRUCTNAME" | |
| 191 >SDL_Surface</SPAN | |
| 192 ></A | |
| 193 >, | |
| 194 <A | |
| 195 HREF="sdllocksurface.html" | |
| 196 ><TT | |
| 197 CLASS="FUNCTION" | |
| 198 >SDL_LockSurface</TT | |
| 199 ></A | |
| 200 ></P | |
| 201 ></DIV | |
| 202 ><DIV | |
| 203 CLASS="NAVFOOTER" | |
| 204 ><HR | |
| 205 ALIGN="LEFT" | |
| 206 WIDTH="100%"><TABLE | |
|
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207 SUMMARY="Footer navigation table" |
| 0 | 208 WIDTH="100%" |
| 209 BORDER="0" | |
| 210 CELLPADDING="0" | |
| 211 CELLSPACING="0" | |
| 212 ><TR | |
| 213 ><TD | |
| 214 WIDTH="33%" | |
| 215 ALIGN="left" | |
| 216 VALIGN="top" | |
| 217 ><A | |
| 218 HREF="sdlsetvideomode.html" | |
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219 ACCESSKEY="P" |
| 0 | 220 >Prev</A |
| 221 ></TD | |
| 222 ><TD | |
| 223 WIDTH="34%" | |
| 224 ALIGN="center" | |
| 225 VALIGN="top" | |
| 226 ><A | |
| 227 HREF="index.html" | |
|
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228 ACCESSKEY="H" |
| 0 | 229 >Home</A |
| 230 ></TD | |
| 231 ><TD | |
| 232 WIDTH="33%" | |
| 233 ALIGN="right" | |
| 234 VALIGN="top" | |
| 235 ><A | |
| 236 HREF="sdlupdaterects.html" | |
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237 ACCESSKEY="N" |
| 0 | 238 >Next</A |
| 239 ></TD | |
| 240 ></TR | |
| 241 ><TR | |
| 242 ><TD | |
| 243 WIDTH="33%" | |
| 244 ALIGN="left" | |
| 245 VALIGN="top" | |
| 246 >SDL_SetVideoMode</TD | |
| 247 ><TD | |
| 248 WIDTH="34%" | |
| 249 ALIGN="center" | |
| 250 VALIGN="top" | |
| 251 ><A | |
| 252 HREF="video.html" | |
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253 ACCESSKEY="U" |
| 0 | 254 >Up</A |
| 255 ></TD | |
| 256 ><TD | |
| 257 WIDTH="33%" | |
| 258 ALIGN="right" | |
| 259 VALIGN="top" | |
| 260 >SDL_UpdateRects</TD | |
| 261 ></TR | |
| 262 ></TABLE | |
| 263 ></DIV | |
| 264 ></BODY | |
| 265 ></HTML | |
| 266 > |