Mercurial > sdl-ios-xcode
annotate docs/html/sdlgetrgba.html @ 4106:12bb6311fd5d SDL-1.2
Hans de Goede fixed bug #495
When running boswars: http://www.boswars.org/ on a machine with intel
integrathed graphics it crashes when it tries to play the initial theora
splashscreen video:
X Error of failed request: BadAlloc (insufficient resources for operation)
Major opcode of failed request: 140 (XVideo)
Minor opcode of failed request: 19 ()
Serial number of failed request: 25
Current serial number in output stream: 26
boswars: xcb_xlib.c:41: xcb_xlib_lock: Assertion `!c->xlib.lock' failed.
Aborted
I recognized this problem from a few years back, when I encountered it while
working on the Xv blitter for xmame. The problem is that for some reason
creation the Xvport and XvImage succeeds, and failure (lack of resources / hw
capability?) is only indicated during the first XvPut[Shm]Image. I've written a
patch for SDL using the work around for this I developed for xmame (and which
is still used successfully in xmame after many years of usage).
I'll admit it isn't very pretty, but after investigating several possibilities
this was the best option, any other fixes would need changes to the SDL api and
abi.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 29 Dec 2007 02:23:48 +0000 |
parents | 355632dca928 |
children |
rev | line source |
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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 > |