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Initial revision
author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
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children 55f1f1b3e27d
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-1:000000000000 0:74212992fb08
1 <HTML
2 ><HEAD
3 ><TITLE
4 >SDL_SetGamma</TITLE
5 ><META
6 NAME="GENERATOR"
7 CONTENT="Modular DocBook HTML Stylesheet Version 1.61
8 "><LINK
9 REL="HOME"
10 TITLE="SDL Library Documentation"
11 HREF="index.html"><LINK
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13 TITLE="Video"
14 HREF="video.html"><LINK
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16 TITLE="SDL_SetPalette"
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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
31 WIDTH="100%"
32 BORDER="0"
33 CELLPADDING="0"
34 CELLSPACING="0"
35 ><TR
36 ><TH
37 COLSPAN="3"
38 ALIGN="center"
39 >SDL Library Documentation</TH
40 ></TR
41 ><TR
42 ><TD
43 WIDTH="10%"
44 ALIGN="left"
45 VALIGN="bottom"
46 ><A
47 HREF="sdlsetpalette.html"
48 >Prev</A
49 ></TD
50 ><TD
51 WIDTH="80%"
52 ALIGN="center"
53 VALIGN="bottom"
54 ></TD
55 ><TD
56 WIDTH="10%"
57 ALIGN="right"
58 VALIGN="bottom"
59 ><A
60 HREF="sdlgetgammaramp.html"
61 >Next</A
62 ></TD
63 ></TR
64 ></TABLE
65 ><HR
66 ALIGN="LEFT"
67 WIDTH="100%"></DIV
68 ><H1
69 ><A
70 NAME="SDLSETGAMMA"
71 >SDL_SetGamma</A
72 ></H1
73 ><DIV
74 CLASS="REFNAMEDIV"
75 ><A
76 NAME="AEN1112"
77 ></A
78 ><H2
79 >Name</H2
80 >SDL_SetGamma&nbsp;--&nbsp;Sets the color gamma function for the display</DIV
81 ><DIV
82 CLASS="REFSYNOPSISDIV"
83 ><A
84 NAME="AEN1115"
85 ></A
86 ><H2
87 >Synopsis</H2
88 ><DIV
89 CLASS="FUNCSYNOPSIS"
90 ><A
91 NAME="AEN1116"
92 ></A
93 ><P
94 ></P
95 ><PRE
96 CLASS="FUNCSYNOPSISINFO"
97 >#include "SDL.h"</PRE
98 ><P
99 ><CODE
100 ><CODE
101 CLASS="FUNCDEF"
102 >int <B
103 CLASS="FSFUNC"
104 >SDL_SetGamma</B
105 ></CODE
106 >(float redgamma, float greengamma, float bluegamma);</CODE
107 ></P
108 ><P
109 ></P
110 ></DIV
111 ></DIV
112 ><DIV
113 CLASS="REFSECT1"
114 ><A
115 NAME="AEN1122"
116 ></A
117 ><H2
118 >Description</H2
119 ><P
120 >Sets the "gamma function" for the display of each color component. Gamma
121 controls the brightness/contrast of colors displayed on the screen.
122 A gamma value of <TT
123 CLASS="CONSTANT"
124 >1.0</TT
125 > is identity (i.e., no adjustment
126 is made).</P
127 ><P
128 >This function adjusts the gamma based on the "gamma function" parameter,
129 you can directly specify lookup tables for gamma adjustment with
130 <A
131 HREF="sdlsetgammaramp.html"
132 >SDL_SetGammaRamp</A
133 >.</P
134 ><P
135 >Not all display hardware is able to change gamma.</P
136 ></DIV
137 ><DIV
138 CLASS="REFSECT1"
139 ><A
140 NAME="AEN1129"
141 ></A
142 ><H2
143 >Return Value</H2
144 ><P
145 >Returns -1 on error (or if gamma adjustment is not supported).</P
146 ></DIV
147 ><DIV
148 CLASS="REFSECT1"
149 ><A
150 NAME="AEN1132"
151 ></A
152 ><H2
153 >See Also</H2
154 ><P
155 ><A
156 HREF="sdlgetgammaramp.html"
157 >SDL_GetGammaRamp</A
158 >
159 <A
160 HREF="sdlsetgammaramp.html"
161 >SDL_SetGammaRamp</A
162 ></P
163 ></DIV
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165 CLASS="NAVFOOTER"
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167 ALIGN="LEFT"
168 WIDTH="100%"><TABLE
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174 ><TD
175 WIDTH="33%"
176 ALIGN="left"
177 VALIGN="top"
178 ><A
179 HREF="sdlsetpalette.html"
180 >Prev</A
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183 WIDTH="34%"
184 ALIGN="center"
185 VALIGN="top"
186 ><A
187 HREF="index.html"
188 >Home</A
189 ></TD
190 ><TD
191 WIDTH="33%"
192 ALIGN="right"
193 VALIGN="top"
194 ><A
195 HREF="sdlgetgammaramp.html"
196 >Next</A
197 ></TD
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199 ><TR
200 ><TD
201 WIDTH="33%"
202 ALIGN="left"
203 VALIGN="top"
204 >SDL_SetPalette</TD
205 ><TD
206 WIDTH="34%"
207 ALIGN="center"
208 VALIGN="top"
209 ><A
210 HREF="video.html"
211 >Up</A
212 ></TD
213 ><TD
214 WIDTH="33%"
215 ALIGN="right"
216 VALIGN="top"
217 >SDL_GetGammaRamp</TD
218 ></TR
219 ></TABLE
220 ></DIV
221 ></BODY
222 ></HTML
223 >