Mercurial > sdl-ios-xcode
annotate docs/html/sdllocksurface.html @ 983:7f08bd66f1ca
Date: Fri, 19 Nov 2004 06:23:53 -0800 (PST)
From: Eric Wing
Subject: OS X Mouse inversion problem fix (again)
Here's yet another patch for the OS X mouse inversion
problem. This should fix the problem once and for all.
I know I've said this before, but *This time for
sure!* :)
If you recall, my last patch broke the non-OpenGL
windowed code and caused the inversion to occur there
instead. Max submitted a patch that partially reverted
the changes back which included the os version hack
which is currently the most recent CVS.
Aaron Sullivan identified and reported to the mailing
list the other day, that the last partial regression
of the code broke OS X 10.2. Looking over the results,
I'm thinking that I was slightly more successful than
I thought at unifying the code. I think I was trying
to unify the code base for OpenGL and non-OpenGL
windowed modes for all versions of the OS. It looks
like I failed at at unifying the OpenGL and non-OpenGL
code, but I did succeed at unifying the OS versions.
Thus, we no longer need the hack for the OS version
checks. The partial regression still included an OS
check which is what broke things for < 10.3.
Attached is the patch for SDL_QuartzWM.m. It basically
is a half-line change that removes one of the two
checks that decides if the mouse coordinates need to
be inverted, i.e:
if (system_version >= 0x1030 &&
(SDL_VideoSurface->flags & SDL_OPENGL) )
becomes this:
if(SDL_VideoSurface->flags & SDL_OPENGL)
With Aaron's outstanding help, we have collectively
tested:
windowed OpenGL
windowed non-OpenGL
fullscreen OpenGL
fullscreen non-OpenGL
under OS X 10.2 (Jaguar), 10.3 (Panther), and 10.4
(Tiger).
We don't have access to 10.0 or 10.1, but since the
original problem didn't materialize until 10.3, I'm
hopeful that testing 10.2 is sufficient. And now that
the code is uniform, I'm also hoping we'll be safe
moving forward to deal with future revisions of the OS
with this issue.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 21 Nov 2004 00:57:47 +0000 |
parents | 355632dca928 |
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rev | line source |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_LockSurface</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_FreeSurface" | |
17 HREF="sdlfreesurface.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_UnlockSurface" | |
20 HREF="sdlunlocksurface.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="sdlfreesurface.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="sdlunlocksurface.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="SDLLOCKSURFACE" | |
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74 ></A |
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75 >SDL_LockSurface</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
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79 NAME="AEN1919" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_LockSurface -- Lock a surface for directly access.</DIV | |
84 ><DIV | |
85 CLASS="REFSYNOPSISDIV" | |
86 ><A | |
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87 NAME="AEN1922" |
0 | 88 ></A |
89 ><H2 | |
90 >Synopsis</H2 | |
91 ><DIV | |
92 CLASS="FUNCSYNOPSIS" | |
93 ><A | |
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94 NAME="AEN1923" |
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_LockSurface</B | |
108 ></CODE | |
109 >(SDL_Surface *surface);</CODE | |
110 ></P | |
111 ><P | |
112 ></P | |
113 ></DIV | |
114 ></DIV | |
115 ><DIV | |
116 CLASS="REFSECT1" | |
117 ><A | |
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118 NAME="AEN1929" |
0 | 119 ></A |
120 ><H2 | |
121 >Description</H2 | |
122 ><P | |
123 ><TT | |
124 CLASS="FUNCTION" | |
125 >SDL_LockSurface</TT | |
126 > sets up a surface for directly | |
127 accessing the pixels. Between calls to <TT | |
128 CLASS="FUNCTION" | |
129 >SDL_LockSurface</TT | |
130 > | |
131 and <TT | |
132 CLASS="FUNCTION" | |
133 >SDL_UnlockSurface</TT | |
134 >, you can write to and read from | |
135 <TT | |
136 CLASS="PARAMETER" | |
137 ><I | |
138 >surface-><TT | |
139 CLASS="STRUCTFIELD" | |
140 ><I | |
141 >pixels</I | |
142 ></TT | |
143 ></I | |
144 ></TT | |
145 >, using the pixel format stored in | |
146 <TT | |
147 CLASS="PARAMETER" | |
148 ><I | |
149 >surface-><TT | |
150 CLASS="STRUCTFIELD" | |
151 ><I | |
152 >format</I | |
153 ></TT | |
154 ></I | |
155 ></TT | |
156 >. Once you are done accessing the | |
157 surface, you should use <TT | |
158 CLASS="FUNCTION" | |
159 >SDL_UnlockSurface</TT | |
160 > to release it.</P | |
161 ><P | |
162 >Not all surfaces require locking. | |
163 If <TT | |
164 CLASS="LITERAL" | |
165 >SDL_MUSTLOCK</TT | |
166 >(<TT | |
167 CLASS="PARAMETER" | |
168 ><I | |
169 >surface</I | |
170 ></TT | |
171 >) | |
172 evaluates to <SPAN | |
173 CLASS="RETURNVALUE" | |
174 >0</SPAN | |
175 >, then you can read and write to the | |
176 surface at any time, and the pixel format of the surface will not change. </P | |
177 ><P | |
178 >No operating system or library calls should be made between lock/unlock | |
179 pairs, as critical system locks may be held during this time.</P | |
180 ><P | |
181 >It should be noted, that since SDL 1.1.8 surface locks are recursive. This means that you can lock a surface multiple times, but each lock must have a match unlock. | |
182 <PRE | |
183 CLASS="PROGRAMLISTING" | |
184 > . | |
185 . | |
186 SDL_LockSurface( surface ); | |
187 . | |
188 /* Surface is locked */ | |
189 /* Direct pixel access on surface here */ | |
190 . | |
191 SDL_LockSurface( surface ); | |
192 . | |
193 /* More direct pixel access on surface */ | |
194 . | |
195 SDL_UnlockSurface( surface ); | |
196 /* Surface is still locked */ | |
197 /* Note: Is versions < 1.1.8, the surface would have been */ | |
198 /* no longer locked at this stage */ | |
199 . | |
200 SDL_UnlockSurface( surface ); | |
201 /* Surface is now unlocked */ | |
202 . | |
203 .</PRE | |
181
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204 ></P |
0 | 205 ></DIV |
206 ><DIV | |
207 CLASS="REFSECT1" | |
208 ><A | |
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209 NAME="AEN1947" |
0 | 210 ></A |
211 ><H2 | |
212 >Return Value</H2 | |
213 ><P | |
214 ><TT | |
215 CLASS="FUNCTION" | |
216 >SDL_LockSurface</TT | |
217 > returns <SPAN | |
218 CLASS="RETURNVALUE" | |
219 >0</SPAN | |
220 >, | |
221 or <SPAN | |
222 CLASS="RETURNVALUE" | |
223 >-1</SPAN | |
224 > if the surface couldn't be locked.</P | |
225 ></DIV | |
226 ><DIV | |
227 CLASS="REFSECT1" | |
228 ><A | |
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229 NAME="AEN1953" |
0 | 230 ></A |
231 ><H2 | |
232 >See Also</H2 | |
233 ><P | |
234 ><A | |
235 HREF="sdlunlocksurface.html" | |
236 ><TT | |
237 CLASS="FUNCTION" | |
238 >SDL_UnlockSurface</TT | |
239 ></A | |
240 ></P | |
241 ></DIV | |
242 ><DIV | |
243 CLASS="NAVFOOTER" | |
244 ><HR | |
245 ALIGN="LEFT" | |
246 WIDTH="100%"><TABLE | |
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247 SUMMARY="Footer navigation table" |
0 | 248 WIDTH="100%" |
249 BORDER="0" | |
250 CELLPADDING="0" | |
251 CELLSPACING="0" | |
252 ><TR | |
253 ><TD | |
254 WIDTH="33%" | |
255 ALIGN="left" | |
256 VALIGN="top" | |
257 ><A | |
258 HREF="sdlfreesurface.html" | |
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259 ACCESSKEY="P" |
0 | 260 >Prev</A |
261 ></TD | |
262 ><TD | |
263 WIDTH="34%" | |
264 ALIGN="center" | |
265 VALIGN="top" | |
266 ><A | |
267 HREF="index.html" | |
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268 ACCESSKEY="H" |
0 | 269 >Home</A |
270 ></TD | |
271 ><TD | |
272 WIDTH="33%" | |
273 ALIGN="right" | |
274 VALIGN="top" | |
275 ><A | |
276 HREF="sdlunlocksurface.html" | |
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277 ACCESSKEY="N" |
0 | 278 >Next</A |
279 ></TD | |
280 ></TR | |
281 ><TR | |
282 ><TD | |
283 WIDTH="33%" | |
284 ALIGN="left" | |
285 VALIGN="top" | |
286 >SDL_FreeSurface</TD | |
287 ><TD | |
288 WIDTH="34%" | |
289 ALIGN="center" | |
290 VALIGN="top" | |
291 ><A | |
292 HREF="video.html" | |
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293 ACCESSKEY="U" |
0 | 294 >Up</A |
295 ></TD | |
296 ><TD | |
297 WIDTH="33%" | |
298 ALIGN="right" | |
299 VALIGN="top" | |
300 >SDL_UnlockSurface</TD | |
301 ></TR | |
302 ></TABLE | |
303 ></DIV | |
304 ></BODY | |
305 ></HTML | |
306 > |