Mercurial > sdl-ios-xcode
annotate docs/html/sdlsetcliprect.html @ 4355:9b464226e541 SDL-1.2
Fixed bug #855
Ludwig Nussel 2009-10-18 06:31:52 PDT
an mprotect call was added to fix bug 528. However that results in a buffer
that allows writing and code execution. Ie the no-execute security features of
modern operating systems are defeated this way. Two mprotect calls are needed.
One to make the buffer executable but not writeable when done and another one
to make the buffer writeable again if the content needs to be changed.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 18 Oct 2009 17:31:37 +0000 |
| parents | 355632dca928 |
| children |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_SetClipRect</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_SetAlpha" | |
| 17 HREF="sdlsetalpha.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_GetClipRect" | |
| 20 HREF="sdlgetcliprect.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="sdlsetalpha.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="sdlgetcliprect.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="SDLSETCLIPRECT" | |
|
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74 ></A |
|
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75 >SDL_SetClipRect</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN2199" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_SetClipRect -- Sets the clipping rectangle for a surface.</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN2202" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN2203" |
| 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_SetClipRect</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="AEN2209" |
| 0 | 119 ></A |
| 120 ><H2 | |
| 121 >Description</H2 | |
| 122 ><P | |
| 123 >Sets the clipping rectangle for a surface. When this surface is the | |
| 124 destination of a blit, only the area within the clip rectangle will be | |
| 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 clipped to the edges of the surface so that the clip rectangle for a | |
| 134 surface can never fall outside the edges of the surface.</P | |
| 135 ><P | |
| 136 >If <TT | |
| 137 CLASS="PARAMETER" | |
| 138 ><I | |
| 139 >rect</I | |
| 140 ></TT | |
| 141 > is <TT | |
| 142 CLASS="LITERAL" | |
| 143 >NULL</TT | |
| 144 > the clipping | |
| 145 rectangle will be set to the full size of the surface.</P | |
| 146 ></DIV | |
| 147 ><DIV | |
| 148 CLASS="REFSECT1" | |
| 149 ><A | |
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150 NAME="AEN2217" |
| 0 | 151 ></A |
| 152 ><H2 | |
| 153 >See Also</H2 | |
| 154 ><P | |
| 155 ><A | |
| 156 HREF="sdlgetcliprect.html" | |
| 157 ><TT | |
| 158 CLASS="FUNCTION" | |
| 159 >SDL_GetClipRect</TT | |
| 160 ></A | |
| 161 >, | |
| 162 <A | |
| 163 HREF="sdlblitsurface.html" | |
| 164 ><TT | |
| 165 CLASS="FUNCTION" | |
| 166 >SDL_BlitSurface</TT | |
| 167 ></A | |
| 168 >, | |
| 169 <A | |
| 170 HREF="sdlsurface.html" | |
| 171 ><SPAN | |
| 172 CLASS="STRUCTNAME" | |
| 173 >SDL_Surface</SPAN | |
| 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="sdlsetalpha.html" | |
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355632dca928
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parents:
181
diff
changeset
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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" | |
|
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
203 ACCESSKEY="H" |
| 0 | 204 >Home</A |
| 205 ></TD | |
| 206 ><TD | |
| 207 WIDTH="33%" | |
| 208 ALIGN="right" | |
| 209 VALIGN="top" | |
| 210 ><A | |
| 211 HREF="sdlgetcliprect.html" | |
|
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
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_SetAlpha</TD | |
| 222 ><TD | |
| 223 WIDTH="34%" | |
| 224 ALIGN="center" | |
| 225 VALIGN="top" | |
| 226 ><A | |
| 227 HREF="video.html" | |
|
803
355632dca928
Updated SDL HTML documentation
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
|
228 ACCESSKEY="U" |
| 0 | 229 >Up</A |
| 230 ></TD | |
| 231 ><TD | |
| 232 WIDTH="33%" | |
| 233 ALIGN="right" | |
| 234 VALIGN="top" | |
| 235 >SDL_GetClipRect</TD | |
| 236 ></TR | |
| 237 ></TABLE | |
| 238 ></DIV | |
| 239 ></BODY | |
| 240 ></HTML | |
| 241 > |