Mercurial > sdl-ios-xcode
annotate docs/html/sdllocksurface.html @ 3097:0d12e8f1de3c
Date: Thu, 05 Feb 2009 18:07:35 +0100
From: Stefan Klug
Subject: [SDL] SDL 1.3 WinCE backend
as promised, I've started to work on the WinCE backend of SDL 1.3
I've modified the win32 video backend and the gdi renderer, to work
properly in WinCE.
The results till now are great, but there is still some work to do.
Attached are two patches with my changes.
I would be happy if someone could review and propably commit them.
The first one (configure.in.patch) should be straight forward without
any side effects.
The second one does the necessary changes to the win32 backend. I was
really unhappy to start slicing this shiny new backend with
#ifdef/#endif but I saw no other option.
The most problematic issues are:
- WinCe has no GetDIBits, so its practically impossible to fill a
BITMAPINFO with correct values. I therefore removed the bmi member from
the GDI_RenderData in SDL_gdirender.c to prevent usage of a not or not
properly initialized bmi.
- In SDL_win32window.c I exchanged some ASCII function by their general
counterparts, (In CE only the Unicode versions are available). I don't
know if this has a negative effect when running in win32
Cheers
Stefan
author | Sam Lantinga <slouken@libsdl.org> |
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date | Mon, 23 Mar 2009 05:35:21 +0000 |
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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 > |