Mercurial > sdl-ios-xcode
annotate docs/html/sdlmutexp.html @ 1012:f14e3059e138
Date: Mon, 13 Dec 2004 21:28:18 -0500
From: Jonathan Atkins
Subject: [SDL] SDL_SaveBMP width bugfix
this fixes the pitch versus width difference that can happen
(especially for 8bit and 24bit (with the exact RGBAmasks) surfaces)
when you use SDL_SaveBMP. The problem was the pitch was used
instead of the width, which in some cases is much wider than the
screen area you really want to save...making for ugly crud on the
saved image borders.
This code has been tested with & without pitch overhangs...and
with the right masks for 24 bit surfaces.
I tested 8,15,16,24,32-0RGB,32-RGBA(with no SDL_SRCALPHA flag).
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 14 Dec 2004 06:20:49 +0000 |
| parents | 355632dca928 |
| children |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_mutexP</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="Multi-threaded Programming" | |
| 14 HREF="thread.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL_DestroyMutex" | |
| 17 HREF="sdldestroymutex.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_mutexV" | |
| 20 HREF="sdlmutexv.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="sdldestroymutex.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="sdlmutexv.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="SDLMUTEXP" | |
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74 ></A |
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75 >SDL_mutexP</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN7872" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_mutexP -- Lock a mutex</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN7875" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN7876" |
| 0 | 95 ></A |
| 96 ><P | |
| 97 ></P | |
| 98 ><PRE | |
| 99 CLASS="FUNCSYNOPSISINFO" | |
| 100 >#include "SDL.h" | |
| 101 #include "SDL_thread.h"</PRE | |
| 102 ><P | |
| 103 ><CODE | |
| 104 ><CODE | |
| 105 CLASS="FUNCDEF" | |
| 106 >int <B | |
| 107 CLASS="FSFUNC" | |
| 108 >SDL_mutexP</B | |
| 109 ></CODE | |
| 110 >(SDL_mutex *mutex);</CODE | |
| 111 ></P | |
| 112 ><P | |
| 113 ></P | |
| 114 ></DIV | |
| 115 ></DIV | |
| 116 ><DIV | |
| 117 CLASS="REFSECT1" | |
| 118 ><A | |
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119 NAME="AEN7882" |
| 0 | 120 ></A |
| 121 ><H2 | |
| 122 >Description</H2 | |
| 123 ><P | |
| 124 >Locks the <TT | |
| 125 CLASS="PARAMETER" | |
| 126 ><I | |
| 127 >mutex</I | |
| 128 ></TT | |
| 129 >, which was previously created with <A | |
| 130 HREF="sdlcreatemutex.html" | |
| 131 ><TT | |
| 132 CLASS="FUNCTION" | |
| 133 >SDL_CreateMutex</TT | |
| 134 ></A | |
| 135 >. If the mutex is already locked then <TT | |
| 136 CLASS="FUNCTION" | |
| 137 >SDL_mutexP</TT | |
| 138 > will not return until it is <A | |
| 139 HREF="sdlmutexv.html" | |
| 140 >unlocked</A | |
| 141 >. Returns <SPAN | |
| 142 CLASS="RETURNVALUE" | |
| 143 >0</SPAN | |
| 144 > on success, or <SPAN | |
| 145 CLASS="RETURNVALUE" | |
| 146 >-1</SPAN | |
| 147 > on an error.</P | |
| 148 ><P | |
| 149 >SDL also defines a macro <TT | |
| 150 CLASS="LITERAL" | |
| 151 >#define SDL_LockMutex(m) SDL_mutexP(m)</TT | |
| 152 >.</P | |
| 153 ></DIV | |
| 154 ><DIV | |
| 155 CLASS="REFSECT1" | |
| 156 ><A | |
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157 NAME="AEN7894" |
| 0 | 158 ></A |
| 159 ><H2 | |
| 160 >See Also</H2 | |
| 161 ><P | |
| 162 ><A | |
| 163 HREF="sdlcreatemutex.html" | |
| 164 ><TT | |
| 165 CLASS="FUNCTION" | |
| 166 >SDL_CreateMutex</TT | |
| 167 ></A | |
| 168 >, | |
| 169 <A | |
| 170 HREF="sdlmutexv.html" | |
| 171 ><TT | |
| 172 CLASS="FUNCTION" | |
| 173 >SDL_mutexV</TT | |
| 174 ></A | |
| 175 ></P | |
| 176 ></DIV | |
| 177 ><DIV | |
| 178 CLASS="NAVFOOTER" | |
| 179 ><HR | |
| 180 ALIGN="LEFT" | |
| 181 WIDTH="100%"><TABLE | |
|
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182 SUMMARY="Footer navigation table" |
| 0 | 183 WIDTH="100%" |
| 184 BORDER="0" | |
| 185 CELLPADDING="0" | |
| 186 CELLSPACING="0" | |
| 187 ><TR | |
| 188 ><TD | |
| 189 WIDTH="33%" | |
| 190 ALIGN="left" | |
| 191 VALIGN="top" | |
| 192 ><A | |
| 193 HREF="sdldestroymutex.html" | |
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355632dca928
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parents:
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194 ACCESSKEY="P" |
| 0 | 195 >Prev</A |
| 196 ></TD | |
| 197 ><TD | |
| 198 WIDTH="34%" | |
| 199 ALIGN="center" | |
| 200 VALIGN="top" | |
| 201 ><A | |
| 202 HREF="index.html" | |
|
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355632dca928
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parents:
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203 ACCESSKEY="H" |
| 0 | 204 >Home</A |
| 205 ></TD | |
| 206 ><TD | |
| 207 WIDTH="33%" | |
| 208 ALIGN="right" | |
| 209 VALIGN="top" | |
| 210 ><A | |
| 211 HREF="sdlmutexv.html" | |
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355632dca928
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parents:
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212 ACCESSKEY="N" |
| 0 | 213 >Next</A |
| 214 ></TD | |
| 215 ></TR | |
| 216 ><TR | |
| 217 ><TD | |
| 218 WIDTH="33%" | |
| 219 ALIGN="left" | |
| 220 VALIGN="top" | |
| 221 >SDL_DestroyMutex</TD | |
| 222 ><TD | |
| 223 WIDTH="34%" | |
| 224 ALIGN="center" | |
| 225 VALIGN="top" | |
| 226 ><A | |
| 227 HREF="thread.html" | |
|
803
355632dca928
Updated SDL HTML documentation
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parents:
181
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changeset
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228 ACCESSKEY="U" |
| 0 | 229 >Up</A |
| 230 ></TD | |
| 231 ><TD | |
| 232 WIDTH="33%" | |
| 233 ALIGN="right" | |
| 234 VALIGN="top" | |
| 235 >SDL_mutexV</TD | |
| 236 ></TR | |
| 237 ></TABLE | |
| 238 ></DIV | |
| 239 ></BODY | |
| 240 ></HTML | |
| 241 > |