1 <HTML 2 ><HEAD 3 ><TITLE 4 >SDL_MapRGB</TITLE 5 ><META 6 NAME="GENERATOR" 7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ 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_SetGammaRamp" 17 HREF="sdlsetgammaramp.html"><LINK 18 REL="NEXT" 19 TITLE="SDL_MapRGBA" 20 HREF="sdlmaprgba.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 SUMMARY="Header navigation table" 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="sdlsetgammaramp.html" 49 ACCESSKEY="P" 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="sdlmaprgba.html" 63 ACCESSKEY="N" 64 >Next</A 65 ></TD 66 ></TR 67 ></TABLE 68 ><HR 69 ALIGN="LEFT" 70 WIDTH="100%"></DIV 71 ><H1 72 ><A 73 NAME="SDLMAPRGB" 74 ></A 75 >SDL_MapRGB</H1 76 ><DIV 77 CLASS="REFNAMEDIV" 78 ><A 79 NAME="AEN1652" 80 ></A 81 ><H2 82 >Name</H2 83 >SDL_MapRGB -- Map a RGB color value to a pixel format.</DIV 84 ><DIV 85 CLASS="REFSYNOPSISDIV" 86 ><A 87 NAME="AEN1655" 88 ></A 89 ><H2 90 >Synopsis</H2 91 ><DIV 92 CLASS="FUNCSYNOPSIS" 93 ><A 94 NAME="AEN1656" 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 >Uint32 <B 106 CLASS="FSFUNC" 107 >SDL_MapRGB</B 108 ></CODE 109 >(SDL_PixelFormat *fmt, Uint8 r, Uint8 g, Uint8 b);</CODE 110 ></P 111 ><P 112 ></P 113 ></DIV 114 ></DIV 115 ><DIV 116 CLASS="REFSECT1" 117 ><A 118 NAME="AEN1662" 119 ></A 120 ><H2 121 >Description</H2 122 ><P 123 >Maps the RGB color value to the specified pixel format and returns the 124 pixel value as a 32-bit int.</P 125 ><P 126 >If the format has a palette (8-bit) the index of the closest matching 127 color in the palette will be returned.</P 128 ><P 129 >If the specified pixel format has an alpha component it will be returned 130 as all 1 bits (fully opaque).</P 131 ></DIV 132 ><DIV 133 CLASS="REFSECT1" 134 ><A 135 NAME="AEN1667" 136 ></A 137 ><H2 138 >Return Value</H2 139 ><P 140 >A pixel value best approximating the given RGB color value for a given 141 pixel format. If the pixel format bpp (color depth) is less than 32-bpp 142 then the unused upper bits of the return value can safely be ignored 143 (e.g., with a 16-bpp format the return value can be assigned to a 144 <SPAN 145 CLASS="TYPE" 146 >Uint16</SPAN 147 >, and similarly a <SPAN 148 CLASS="TYPE" 149 >Uint8</SPAN 150 > for an 8-bpp 151 format).</P 152 ></DIV 153 ><DIV 154 CLASS="REFSECT1" 155 ><A 156 NAME="AEN1672" 157 ></A 158 ><H2 159 >See Also</H2 160 ><P 161 ><A 162 HREF="sdlgetrgb.html" 163 ><TT 164 CLASS="FUNCTION" 165 >SDL_GetRGB</TT 166 ></A 167 >, 168 <A 169 HREF="sdlgetrgba.html" 170 ><TT 171 CLASS="FUNCTION" 172 >SDL_GetRGBA</TT 173 ></A 174 >, 175 <A 176 HREF="sdlmaprgba.html" 177 ><TT 178 CLASS="FUNCTION" 179 >SDL_MapRGBA</TT 180 ></A 181 >, 182 <A 183 HREF="sdlpixelformat.html" 184 ><SPAN 185 CLASS="STRUCTNAME" 186 >SDL_PixelFormat</SPAN 187 ></A 188 ></P 189 ></DIV 190 ><DIV 191 CLASS="NAVFOOTER" 192 ><HR 193 ALIGN="LEFT" 194 WIDTH="100%"><TABLE 195 SUMMARY="Footer navigation table" 196 WIDTH="100%" 197 BORDER="0" 198 CELLPADDING="0" 199 CELLSPACING="0" 200 ><TR 201 ><TD 202 WIDTH="33%" 203 ALIGN="left" 204 VALIGN="top" 205 ><A 206 HREF="sdlsetgammaramp.html" 207 ACCESSKEY="P" 208 >Prev</A 209 ></TD 210 ><TD 211 WIDTH="34%" 212 ALIGN="center" 213 VALIGN="top" 214 ><A 215 HREF="index.html" 216 ACCESSKEY="H" 217 >Home</A 218 ></TD 219 ><TD 220 WIDTH="33%" 221 ALIGN="right" 222 VALIGN="top" 223 ><A 224 HREF="sdlmaprgba.html" 225 ACCESSKEY="N" 226 >Next</A 227 ></TD 228 ></TR 229 ><TR 230 ><TD 231 WIDTH="33%" 232 ALIGN="left" 233 VALIGN="top" 234 >SDL_SetGammaRamp</TD 235 ><TD 236 WIDTH="34%" 237 ALIGN="center" 238 VALIGN="top" 239 ><A 240 HREF="video.html" 241 ACCESSKEY="U" 242 >Up</A 243 ></TD 244 ><TD 245 WIDTH="33%" 246 ALIGN="right" 247 VALIGN="top" 248 >SDL_MapRGBA</TD 249 ></TR 250 ></TABLE 251 ></DIV 252 ></BODY 253 ></HTML 254 >