Mercurial > sdl-ios-xcode
annotate docs/html/sdlsavebmp.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_SaveBMP</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_LoadBMP" | |
| 17 HREF="sdlloadbmp.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_SetColorKey" | |
| 20 HREF="sdlsetcolorkey.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="sdlloadbmp.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="sdlsetcolorkey.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="SDLSAVEBMP" | |
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74 ></A |
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75 >SDL_SaveBMP</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN2015" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_SaveBMP -- Save an SDL_Surface as a Windows BMP file.</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN2018" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN2019" |
| 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_SaveBMP</B | |
| 108 ></CODE | |
| 109 >(SDL_Surface *surface, const char *file);</CODE | |
| 110 ></P | |
| 111 ><P | |
| 112 ></P | |
| 113 ></DIV | |
| 114 ></DIV | |
| 115 ><DIV | |
| 116 CLASS="REFSECT1" | |
| 117 ><A | |
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118 NAME="AEN2025" |
| 0 | 119 ></A |
| 120 ><H2 | |
| 121 >Description</H2 | |
| 122 ><P | |
| 123 >Saves the <SPAN | |
| 124 CLASS="STRUCTNAME" | |
| 125 >SDL_Surface</SPAN | |
| 126 > <TT | |
| 127 CLASS="PARAMETER" | |
| 128 ><I | |
| 129 >surface</I | |
| 130 ></TT | |
| 131 > as a Windows BMP file named <TT | |
| 132 CLASS="PARAMETER" | |
| 133 ><I | |
| 134 >file</I | |
| 135 ></TT | |
| 136 >.</P | |
| 137 ></DIV | |
| 138 ><DIV | |
| 139 CLASS="REFSECT1" | |
| 140 ><A | |
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141 NAME="AEN2031" |
| 0 | 142 ></A |
| 143 ><H2 | |
| 144 >Return Value</H2 | |
| 145 ><P | |
| 146 >Returns <SPAN | |
| 147 CLASS="RETURNVALUE" | |
| 148 >0</SPAN | |
| 149 > if successful or | |
| 150 <SPAN | |
| 151 CLASS="RETURNVALUE" | |
| 152 >-1</SPAN | |
| 153 > | |
| 154 if there was an error.</P | |
| 155 ></DIV | |
| 156 ><DIV | |
| 157 CLASS="REFSECT1" | |
| 158 ><A | |
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159 NAME="AEN2036" |
| 0 | 160 ></A |
| 161 ><H2 | |
| 162 >See Also</H2 | |
| 163 ><P | |
| 164 ><A | |
| 165 HREF="sdlloadbmp.html" | |
| 166 ><TT | |
| 167 CLASS="FUNCTION" | |
| 168 >SDL_LoadBMP</TT | |
| 169 ></A | |
| 170 ></P | |
| 171 ></DIV | |
| 172 ><DIV | |
| 173 CLASS="NAVFOOTER" | |
| 174 ><HR | |
| 175 ALIGN="LEFT" | |
| 176 WIDTH="100%"><TABLE | |
|
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parents:
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177 SUMMARY="Footer navigation table" |
| 0 | 178 WIDTH="100%" |
| 179 BORDER="0" | |
| 180 CELLPADDING="0" | |
| 181 CELLSPACING="0" | |
| 182 ><TR | |
| 183 ><TD | |
| 184 WIDTH="33%" | |
| 185 ALIGN="left" | |
| 186 VALIGN="top" | |
| 187 ><A | |
| 188 HREF="sdlloadbmp.html" | |
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803
355632dca928
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Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
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189 ACCESSKEY="P" |
| 0 | 190 >Prev</A |
| 191 ></TD | |
| 192 ><TD | |
| 193 WIDTH="34%" | |
| 194 ALIGN="center" | |
| 195 VALIGN="top" | |
| 196 ><A | |
| 197 HREF="index.html" | |
|
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
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198 ACCESSKEY="H" |
| 0 | 199 >Home</A |
| 200 ></TD | |
| 201 ><TD | |
| 202 WIDTH="33%" | |
| 203 ALIGN="right" | |
| 204 VALIGN="top" | |
| 205 ><A | |
| 206 HREF="sdlsetcolorkey.html" | |
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803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
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207 ACCESSKEY="N" |
| 0 | 208 >Next</A |
| 209 ></TD | |
| 210 ></TR | |
| 211 ><TR | |
| 212 ><TD | |
| 213 WIDTH="33%" | |
| 214 ALIGN="left" | |
| 215 VALIGN="top" | |
| 216 >SDL_LoadBMP</TD | |
| 217 ><TD | |
| 218 WIDTH="34%" | |
| 219 ALIGN="center" | |
| 220 VALIGN="top" | |
| 221 ><A | |
| 222 HREF="video.html" | |
|
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
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223 ACCESSKEY="U" |
| 0 | 224 >Up</A |
| 225 ></TD | |
| 226 ><TD | |
| 227 WIDTH="33%" | |
| 228 ALIGN="right" | |
| 229 VALIGN="top" | |
| 230 >SDL_SetColorKey</TD | |
| 231 ></TR | |
| 232 ></TABLE | |
| 233 ></DIV | |
| 234 ></BODY | |
| 235 ></HTML | |
| 236 > |