Mercurial > sdl-ios-xcode
annotate docs/html/sdlsetgammaramp.html @ 756:10332c6fad2e
te: Mon, 15 Dec 2003 08:25:14 -0800 PST
From: "Andrew Bachmann"
Subject: libSDL patches for beos video
I created some patches to SDL:
1. YUV overlay support
2. maintain high refresh rate when changing resolutions to a lower resolution
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 16 Dec 2003 13:04:44 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_SetGammaRamp</TITLE | |
| 5 ><META | |
| 6 NAME="GENERATOR" | |
|
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.64 |
| 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_GetGammaRamp" | |
| 17 HREF="sdlgetgammaramp.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_MapRGB" | |
| 20 HREF="sdlmaprgb.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="sdlgetgammaramp.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="sdlmaprgb.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="SDLSETGAMMARAMP" | |
| 71 >SDL_SetGammaRamp</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
|
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76 NAME="AEN1240" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_SetGammaRamp -- Sets the color gamma lookup tables for the display</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSYNOPSISDIV" | |
| 83 ><A | |
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84 NAME="AEN1243" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Synopsis</H2 | |
| 88 ><DIV | |
| 89 CLASS="FUNCSYNOPSIS" | |
| 90 ><A | |
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91 NAME="AEN1244" |
| 0 | 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_SetGammaRamp</B | |
| 105 ></CODE | |
| 106 >(Uint16 *redtable, Uint16 *greentable, Uint16 *bluetable);</CODE | |
| 107 ></P | |
| 108 ><P | |
| 109 ></P | |
| 110 ></DIV | |
| 111 ></DIV | |
| 112 ><DIV | |
| 113 CLASS="REFSECT1" | |
| 114 ><A | |
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115 NAME="AEN1250" |
| 0 | 116 ></A |
| 117 ><H2 | |
| 118 >Description</H2 | |
| 119 ><P | |
| 120 >Sets the gamma lookup tables for the display for each color component. | |
| 121 Each table is an array of 256 Uint16 values, representing a mapping | |
| 122 between the input and output for that channel. The input is the index | |
| 123 into the array, and the output is the 16-bit gamma value at that index, | |
| 124 scaled to the output color precision. You may pass NULL to any of the | |
| 125 channels to leave them unchanged.</P | |
| 126 ><P | |
| 127 >This function adjusts the gamma based on lookup tables, you can also | |
| 128 have the gamma calculated based on a "gamma function" parameter with | |
| 129 <A | |
| 130 HREF="sdlsetgamma.html" | |
| 131 >SDL_SetGamma</A | |
| 132 >.</P | |
| 133 ><P | |
| 134 >Not all display hardware is able to change gamma.</P | |
| 135 ></DIV | |
| 136 ><DIV | |
| 137 CLASS="REFSECT1" | |
| 138 ><A | |
|
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139 NAME="AEN1256" |
| 0 | 140 ></A |
| 141 ><H2 | |
| 142 >Return Value</H2 | |
| 143 ><P | |
| 144 >Returns -1 on error (or if gamma adjustment is not supported).</P | |
| 145 ></DIV | |
| 146 ><DIV | |
| 147 CLASS="REFSECT1" | |
| 148 ><A | |
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149 NAME="AEN1259" |
| 0 | 150 ></A |
| 151 ><H2 | |
| 152 >See Also</H2 | |
| 153 ><P | |
| 154 ><A | |
| 155 HREF="sdlsetgamma.html" | |
| 156 >SDL_SetGamma</A | |
| 157 > | |
| 158 <A | |
| 159 HREF="sdlgetgammaramp.html" | |
| 160 >SDL_GetGammaRamp</A | |
| 161 ></P | |
| 162 ></DIV | |
| 163 ><DIV | |
| 164 CLASS="NAVFOOTER" | |
| 165 ><HR | |
| 166 ALIGN="LEFT" | |
| 167 WIDTH="100%"><TABLE | |
| 168 WIDTH="100%" | |
| 169 BORDER="0" | |
| 170 CELLPADDING="0" | |
| 171 CELLSPACING="0" | |
| 172 ><TR | |
| 173 ><TD | |
| 174 WIDTH="33%" | |
| 175 ALIGN="left" | |
| 176 VALIGN="top" | |
| 177 ><A | |
| 178 HREF="sdlgetgammaramp.html" | |
| 179 >Prev</A | |
| 180 ></TD | |
| 181 ><TD | |
| 182 WIDTH="34%" | |
| 183 ALIGN="center" | |
| 184 VALIGN="top" | |
| 185 ><A | |
| 186 HREF="index.html" | |
| 187 >Home</A | |
| 188 ></TD | |
| 189 ><TD | |
| 190 WIDTH="33%" | |
| 191 ALIGN="right" | |
| 192 VALIGN="top" | |
| 193 ><A | |
| 194 HREF="sdlmaprgb.html" | |
| 195 >Next</A | |
| 196 ></TD | |
| 197 ></TR | |
| 198 ><TR | |
| 199 ><TD | |
| 200 WIDTH="33%" | |
| 201 ALIGN="left" | |
| 202 VALIGN="top" | |
| 203 >SDL_GetGammaRamp</TD | |
| 204 ><TD | |
| 205 WIDTH="34%" | |
| 206 ALIGN="center" | |
| 207 VALIGN="top" | |
| 208 ><A | |
| 209 HREF="video.html" | |
| 210 >Up</A | |
| 211 ></TD | |
| 212 ><TD | |
| 213 WIDTH="33%" | |
| 214 ALIGN="right" | |
| 215 VALIGN="top" | |
| 216 >SDL_MapRGB</TD | |
| 217 ></TR | |
| 218 ></TABLE | |
| 219 ></DIV | |
| 220 ></BODY | |
| 221 ></HTML | |
| 222 > |