Mercurial > sdl-ios-xcode
annotate docs/html/sdlgetcliprect.html @ 2042:3908e1f808e1
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 15:56:36 +0000 |
| parents | 355632dca928 |
| children |
| 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 1.76b+ |
| 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_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 | |
|
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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="sdlsetcliprect.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="sdlconvertsurface.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="SDLGETCLIPRECT" | |
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74 ></A |
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75 >SDL_GetClipRect</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN2230" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_GetClipRect -- Gets the clipping rectangle for a surface.</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN2233" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN2234" |
| 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_GetClipRect</B | |
| 108 ></CODE | |
| 109 >(SDL_Surface *surface, SDL_Rect *rect);</CODE | |
| 110 ></P | |
| 111 ><P | |
| 112 ></P | |
| 113 ></DIV | |
| 114 ></DIV | |
| 115 ><DIV | |
| 116 CLASS="REFSECT1" | |
| 117 ><A | |
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118 NAME="AEN2240" |
| 0 | 119 ></A |
| 120 ><H2 | |
| 121 >Description</H2 | |
| 122 ><P | |
| 123 >Gets the clipping rectangle for a surface. When this surface is the | |
| 124 destination of a blit, only the area within the clip rectangle is | |
| 125 drawn into.</P | |
| 126 ><P | |
| 127 >The rectangle pointed to by <TT | |
| 128 CLASS="PARAMETER" | |
| 129 ><I | |
| 130 >rect</I | |
| 131 ></TT | |
| 132 > will be | |
| 133 filled with the clipping rectangle of the surface.</P | |
| 134 ></DIV | |
| 135 ><DIV | |
| 136 CLASS="REFSECT1" | |
| 137 ><A | |
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138 NAME="AEN2245" |
| 0 | 139 ></A |
| 140 ><H2 | |
| 141 >See Also</H2 | |
| 142 ><P | |
| 143 ><A | |
| 144 HREF="sdlsetcliprect.html" | |
| 145 ><TT | |
| 146 CLASS="FUNCTION" | |
| 147 >SDL_SetClipRect</TT | |
| 148 ></A | |
| 149 >, | |
| 150 <A | |
| 151 HREF="sdlblitsurface.html" | |
| 152 ><TT | |
| 153 CLASS="FUNCTION" | |
| 154 >SDL_BlitSurface</TT | |
| 155 ></A | |
| 156 >, | |
| 157 <A | |
| 158 HREF="sdlsurface.html" | |
| 159 ><SPAN | |
| 160 CLASS="STRUCTNAME" | |
| 161 >SDL_Surface</SPAN | |
| 162 ></A | |
| 163 ></P | |
| 164 ></DIV | |
| 165 ><DIV | |
| 166 CLASS="NAVFOOTER" | |
| 167 ><HR | |
| 168 ALIGN="LEFT" | |
| 169 WIDTH="100%"><TABLE | |
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170 SUMMARY="Footer navigation table" |
| 0 | 171 WIDTH="100%" |
| 172 BORDER="0" | |
| 173 CELLPADDING="0" | |
| 174 CELLSPACING="0" | |
| 175 ><TR | |
| 176 ><TD | |
| 177 WIDTH="33%" | |
| 178 ALIGN="left" | |
| 179 VALIGN="top" | |
| 180 ><A | |
| 181 HREF="sdlsetcliprect.html" | |
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803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
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182 ACCESSKEY="P" |
| 0 | 183 >Prev</A |
| 184 ></TD | |
| 185 ><TD | |
| 186 WIDTH="34%" | |
| 187 ALIGN="center" | |
| 188 VALIGN="top" | |
| 189 ><A | |
| 190 HREF="index.html" | |
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803
355632dca928
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Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
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191 ACCESSKEY="H" |
| 0 | 192 >Home</A |
| 193 ></TD | |
| 194 ><TD | |
| 195 WIDTH="33%" | |
| 196 ALIGN="right" | |
| 197 VALIGN="top" | |
| 198 ><A | |
| 199 HREF="sdlconvertsurface.html" | |
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803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
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200 ACCESSKEY="N" |
| 0 | 201 >Next</A |
| 202 ></TD | |
| 203 ></TR | |
| 204 ><TR | |
| 205 ><TD | |
| 206 WIDTH="33%" | |
| 207 ALIGN="left" | |
| 208 VALIGN="top" | |
| 209 >SDL_SetClipRect</TD | |
| 210 ><TD | |
| 211 WIDTH="34%" | |
| 212 ALIGN="center" | |
| 213 VALIGN="top" | |
| 214 ><A | |
| 215 HREF="video.html" | |
|
803
355632dca928
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Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
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216 ACCESSKEY="U" |
| 0 | 217 >Up</A |
| 218 ></TD | |
| 219 ><TD | |
| 220 WIDTH="33%" | |
| 221 ALIGN="right" | |
| 222 VALIGN="top" | |
| 223 >SDL_ConvertSurface</TD | |
| 224 ></TR | |
| 225 ></TABLE | |
| 226 ></DIV | |
| 227 ></BODY | |
| 228 ></HTML | |
| 229 > |