Mercurial > sdl-ios-xcode
annotate docs/html/sdlgetrgba.html @ 1157:baf35853ad54
Date: Mon, 10 Oct 2005 13:09:32 +0300
From: Tommi Kyntola <tommi.kyntola@ray.fi>
To: sdl@libsdl.org
Subject: [SDL] [RFC] get_ticks broken on linux
It uses gettimeofday to calculate the timedifference.
Gettimeofday returns current time which is seldom monotonous.
This breaks SDL timer subsystem. (time callbacks and all that
get borked when the time difference ms is suddenly ~ 2^32)
I posted a message about this earlier but got no response.
Some thoughts on this matter would be appreciated.
(Or even an explanation for the lack of interest.)
A patch below would use the posix timers that have been around
since posix 93 and do provide a good source of monotonous time
on linux boxes (and on few others too).
The following patch is also availabe at:
http://www.hut.fi/u/tkyntola/SDL-1.2.9-clockfix.patch
It's against 1.2.9, but I can easily rediffit against
the cvs branch is needed.
cheers,
Tommi Kyntola tommi.kyntola@ray.fi
author | Ryan C. Gordon <icculus@icculus.org> |
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date | Tue, 11 Oct 2005 18:16:12 +0000 |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_GetRGBA</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_GetRGB" | |
17 HREF="sdlgetrgb.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_CreateRGBSurface" | |
20 HREF="sdlcreatergbsurface.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="sdlgetrgb.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="sdlcreatergbsurface.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="SDLGETRGBA" | |
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74 ></A |
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75 >SDL_GetRGBA</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
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79 NAME="AEN1747" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_GetRGBA -- Get RGBA values from a pixel in the specified pixel format.</DIV | |
84 ><DIV | |
85 CLASS="REFSYNOPSISDIV" | |
86 ><A | |
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87 NAME="AEN1750" |
0 | 88 ></A |
89 ><H2 | |
90 >Synopsis</H2 | |
91 ><DIV | |
92 CLASS="FUNCSYNOPSIS" | |
93 ><A | |
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94 NAME="AEN1751" |
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_GetRGBA</B | |
108 ></CODE | |
109 >(Uint32 pixel, SDL_PixelFormat *fmt, Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a);</CODE | |
110 ></P | |
111 ><P | |
112 ></P | |
113 ></DIV | |
114 ></DIV | |
115 ><DIV | |
116 CLASS="REFSECT1" | |
117 ><A | |
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118 NAME="AEN1757" |
0 | 119 ></A |
120 ><H2 | |
121 >Description</H2 | |
122 ><P | |
123 >Get RGBA component values from a pixel stored in the specified pixel format.</P | |
124 ><P | |
125 >This function uses the entire 8-bit [0..255] range when converting color | |
126 components from pixel formats with less than 8-bits per RGB component | |
127 (e.g., a completely white pixel in 16-bit RGB565 format would return | |
128 [0xff, 0xff, 0xff] not [0xf8, 0xfc, 0xf8]).</P | |
129 ><P | |
130 >If the surface has no alpha component, the alpha will be returned as 0xff | |
131 (100% opaque).</P | |
132 ></DIV | |
133 ><DIV | |
134 CLASS="REFSECT1" | |
135 ><A | |
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136 NAME="AEN1762" |
0 | 137 ></A |
138 ><H2 | |
139 >See Also</H2 | |
140 ><P | |
141 ><A | |
142 HREF="sdlgetrgb.html" | |
143 >SDL_GetRGB</A | |
144 >, | |
145 <A | |
146 HREF="sdlmaprgb.html" | |
147 >SDL_MapRGB</A | |
148 >, | |
149 <A | |
150 HREF="sdlmaprgba.html" | |
151 >SDL_MapRGBA</A | |
152 >, | |
153 <A | |
154 HREF="sdlpixelformat.html" | |
155 >SDL_PixelFormat</A | |
156 ></P | |
157 ></DIV | |
158 ><DIV | |
159 CLASS="NAVFOOTER" | |
160 ><HR | |
161 ALIGN="LEFT" | |
162 WIDTH="100%"><TABLE | |
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163 SUMMARY="Footer navigation table" |
0 | 164 WIDTH="100%" |
165 BORDER="0" | |
166 CELLPADDING="0" | |
167 CELLSPACING="0" | |
168 ><TR | |
169 ><TD | |
170 WIDTH="33%" | |
171 ALIGN="left" | |
172 VALIGN="top" | |
173 ><A | |
174 HREF="sdlgetrgb.html" | |
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175 ACCESSKEY="P" |
0 | 176 >Prev</A |
177 ></TD | |
178 ><TD | |
179 WIDTH="34%" | |
180 ALIGN="center" | |
181 VALIGN="top" | |
182 ><A | |
183 HREF="index.html" | |
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184 ACCESSKEY="H" |
0 | 185 >Home</A |
186 ></TD | |
187 ><TD | |
188 WIDTH="33%" | |
189 ALIGN="right" | |
190 VALIGN="top" | |
191 ><A | |
192 HREF="sdlcreatergbsurface.html" | |
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193 ACCESSKEY="N" |
0 | 194 >Next</A |
195 ></TD | |
196 ></TR | |
197 ><TR | |
198 ><TD | |
199 WIDTH="33%" | |
200 ALIGN="left" | |
201 VALIGN="top" | |
202 >SDL_GetRGB</TD | |
203 ><TD | |
204 WIDTH="34%" | |
205 ALIGN="center" | |
206 VALIGN="top" | |
207 ><A | |
208 HREF="video.html" | |
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209 ACCESSKEY="U" |
0 | 210 >Up</A |
211 ></TD | |
212 ><TD | |
213 WIDTH="33%" | |
214 ALIGN="right" | |
215 VALIGN="top" | |
216 >SDL_CreateRGBSurface</TD | |
217 ></TR | |
218 ></TABLE | |
219 ></DIV | |
220 ></BODY | |
221 ></HTML | |
222 > |