Mercurial > sdl-ios-xcode
annotate docs/html/sdlsetgamma.html @ 2328:91e601d9df8b
re: bug#563. checking in some commented out trace code and a fix so that the in testalpha.c the background only flashes when alpha == 255. The problem that is being
fixed is caused by clearing SDL_COPY_RLE_COLORKEY without setting SDL_COPY_RLE_DESIRED in SDL_UnRELSurface.
author | Bob Pendleton <bob@pendleton.com> |
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date | Fri, 14 Mar 2008 18:17:49 +0000 |
parents | 355632dca928 |
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rev | line source |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_SetGamma</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_SetPalette" | |
17 HREF="sdlsetpalette.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_GetGammaRamp" | |
20 HREF="sdlgetgammaramp.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="sdlsetpalette.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="sdlgetgammaramp.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="SDLSETGAMMA" | |
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74 ></A |
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75 >SDL_SetGamma</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
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79 NAME="AEN1569" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_SetGamma -- Sets the color gamma function for the display</DIV | |
84 ><DIV | |
85 CLASS="REFSYNOPSISDIV" | |
86 ><A | |
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87 NAME="AEN1572" |
0 | 88 ></A |
89 ><H2 | |
90 >Synopsis</H2 | |
91 ><DIV | |
92 CLASS="FUNCSYNOPSIS" | |
93 ><A | |
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94 NAME="AEN1573" |
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_SetGamma</B | |
108 ></CODE | |
109 >(float redgamma, float greengamma, float bluegamma);</CODE | |
110 ></P | |
111 ><P | |
112 ></P | |
113 ></DIV | |
114 ></DIV | |
115 ><DIV | |
116 CLASS="REFSECT1" | |
117 ><A | |
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118 NAME="AEN1579" |
0 | 119 ></A |
120 ><H2 | |
121 >Description</H2 | |
122 ><P | |
123 >Sets the "gamma function" for the display of each color component. Gamma | |
124 controls the brightness/contrast of colors displayed on the screen. | |
125 A gamma value of <TT | |
126 CLASS="CONSTANT" | |
127 >1.0</TT | |
128 > is identity (i.e., no adjustment | |
129 is made).</P | |
130 ><P | |
131 >This function adjusts the gamma based on the "gamma function" parameter, | |
132 you can directly specify lookup tables for gamma adjustment with | |
133 <A | |
134 HREF="sdlsetgammaramp.html" | |
135 >SDL_SetGammaRamp</A | |
136 >.</P | |
137 ><P | |
138 >Not all display hardware is able to change gamma.</P | |
139 ></DIV | |
140 ><DIV | |
141 CLASS="REFSECT1" | |
142 ><A | |
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143 NAME="AEN1586" |
0 | 144 ></A |
145 ><H2 | |
146 >Return Value</H2 | |
147 ><P | |
148 >Returns -1 on error (or if gamma adjustment is not supported).</P | |
149 ></DIV | |
150 ><DIV | |
151 CLASS="REFSECT1" | |
152 ><A | |
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153 NAME="AEN1589" |
0 | 154 ></A |
155 ><H2 | |
156 >See Also</H2 | |
157 ><P | |
158 ><A | |
159 HREF="sdlgetgammaramp.html" | |
160 >SDL_GetGammaRamp</A | |
161 > | |
162 <A | |
163 HREF="sdlsetgammaramp.html" | |
164 >SDL_SetGammaRamp</A | |
165 ></P | |
166 ></DIV | |
167 ><DIV | |
168 CLASS="NAVFOOTER" | |
169 ><HR | |
170 ALIGN="LEFT" | |
171 WIDTH="100%"><TABLE | |
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172 SUMMARY="Footer navigation table" |
0 | 173 WIDTH="100%" |
174 BORDER="0" | |
175 CELLPADDING="0" | |
176 CELLSPACING="0" | |
177 ><TR | |
178 ><TD | |
179 WIDTH="33%" | |
180 ALIGN="left" | |
181 VALIGN="top" | |
182 ><A | |
183 HREF="sdlsetpalette.html" | |
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184 ACCESSKEY="P" |
0 | 185 >Prev</A |
186 ></TD | |
187 ><TD | |
188 WIDTH="34%" | |
189 ALIGN="center" | |
190 VALIGN="top" | |
191 ><A | |
192 HREF="index.html" | |
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193 ACCESSKEY="H" |
0 | 194 >Home</A |
195 ></TD | |
196 ><TD | |
197 WIDTH="33%" | |
198 ALIGN="right" | |
199 VALIGN="top" | |
200 ><A | |
201 HREF="sdlgetgammaramp.html" | |
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202 ACCESSKEY="N" |
0 | 203 >Next</A |
204 ></TD | |
205 ></TR | |
206 ><TR | |
207 ><TD | |
208 WIDTH="33%" | |
209 ALIGN="left" | |
210 VALIGN="top" | |
211 >SDL_SetPalette</TD | |
212 ><TD | |
213 WIDTH="34%" | |
214 ALIGN="center" | |
215 VALIGN="top" | |
216 ><A | |
217 HREF="video.html" | |
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218 ACCESSKEY="U" |
0 | 219 >Up</A |
220 ></TD | |
221 ><TD | |
222 WIDTH="33%" | |
223 ALIGN="right" | |
224 VALIGN="top" | |
225 >SDL_GetGammaRamp</TD | |
226 ></TR | |
227 ></TABLE | |
228 ></DIV | |
229 ></BODY | |
230 ></HTML | |
231 > |