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annotate docs/html/sdlmaprgba.html @ 551:b0c5a13a4243
Doh! Compile error if there was no X11 shared image support
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 02 Dec 2002 01:47:03 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_MapRGBA</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_MapRGB" | |
| 17 HREF="sdlmaprgb.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_GetRGB" | |
| 20 HREF="sdlgetrgb.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="sdlmaprgb.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="sdlgetrgb.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="SDLMAPRGBA" | |
| 71 >SDL_MapRGBA</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
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76 NAME="AEN1303" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_MapRGBA -- Map a RGBA color value to a pixel format.</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSYNOPSISDIV" | |
| 83 ><A | |
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84 NAME="AEN1306" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Synopsis</H2 | |
| 88 ><DIV | |
| 89 CLASS="FUNCSYNOPSIS" | |
| 90 ><A | |
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91 NAME="AEN1307" |
| 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 >Uint32 <B | |
| 103 CLASS="FSFUNC" | |
| 104 >SDL_MapRGBA</B | |
| 105 ></CODE | |
| 106 >(SDL_PixelFormat *fmt, Uint8 r, Uint8 g, Uint8 b, Uint8 a);</CODE | |
| 107 ></P | |
| 108 ><P | |
| 109 ></P | |
| 110 ></DIV | |
| 111 ></DIV | |
| 112 ><DIV | |
| 113 CLASS="REFSECT1" | |
| 114 ><A | |
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115 NAME="AEN1313" |
| 0 | 116 ></A |
| 117 ><H2 | |
| 118 >Description</H2 | |
| 119 ><P | |
| 120 >Maps the RGBA color value to the specified pixel format and returns the | |
| 121 pixel value as a 32-bit int.</P | |
| 122 ><P | |
| 123 >If the format has a palette (8-bit) the index of the closest matching | |
| 124 color in the palette will be returned.</P | |
| 125 ><P | |
| 126 >If the specified pixel format has no alpha component the alpha value | |
| 127 will be ignored (as it will be in formats with a palette).</P | |
| 128 ></DIV | |
| 129 ><DIV | |
| 130 CLASS="REFSECT1" | |
| 131 ><A | |
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132 NAME="AEN1318" |
| 0 | 133 ></A |
| 134 ><H2 | |
| 135 >Return Value</H2 | |
| 136 ><P | |
| 137 >A pixel value best approximating the given RGBA color value for a given | |
| 138 pixel format. If the pixel format bpp (color depth) is less than 32-bpp | |
| 139 then the unused upper bits of the return value can safely be ignored | |
| 140 (e.g., with a 16-bpp format the return value can be assigned to a | |
| 141 <SPAN | |
| 142 CLASS="TYPE" | |
| 143 >Uint16</SPAN | |
| 144 >, and similarly a <SPAN | |
| 145 CLASS="TYPE" | |
| 146 >Uint8</SPAN | |
| 147 > for an 8-bpp | |
| 148 format).</P | |
| 149 ></DIV | |
| 150 ><DIV | |
| 151 CLASS="REFSECT1" | |
| 152 ><A | |
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153 NAME="AEN1323" |
| 0 | 154 ></A |
| 155 ><H2 | |
| 156 >See Also</H2 | |
| 157 ><P | |
| 158 ><A | |
| 159 HREF="sdlgetrgb.html" | |
| 160 >SDL_GetRGB</A | |
| 161 >, | |
| 162 <A | |
| 163 HREF="sdlgetrgba.html" | |
| 164 >SDL_GetRGBA</A | |
| 165 >, | |
| 166 <A | |
| 167 HREF="sdlmaprgb.html" | |
| 168 >SDL_MapRGB</A | |
| 169 >, | |
| 170 <A | |
| 171 HREF="sdlpixelformat.html" | |
| 172 >SDL_PixelFormat</A | |
| 173 ></P | |
| 174 ></DIV | |
| 175 ><DIV | |
| 176 CLASS="NAVFOOTER" | |
| 177 ><HR | |
| 178 ALIGN="LEFT" | |
| 179 WIDTH="100%"><TABLE | |
| 180 WIDTH="100%" | |
| 181 BORDER="0" | |
| 182 CELLPADDING="0" | |
| 183 CELLSPACING="0" | |
| 184 ><TR | |
| 185 ><TD | |
| 186 WIDTH="33%" | |
| 187 ALIGN="left" | |
| 188 VALIGN="top" | |
| 189 ><A | |
| 190 HREF="sdlmaprgb.html" | |
| 191 >Prev</A | |
| 192 ></TD | |
| 193 ><TD | |
| 194 WIDTH="34%" | |
| 195 ALIGN="center" | |
| 196 VALIGN="top" | |
| 197 ><A | |
| 198 HREF="index.html" | |
| 199 >Home</A | |
| 200 ></TD | |
| 201 ><TD | |
| 202 WIDTH="33%" | |
| 203 ALIGN="right" | |
| 204 VALIGN="top" | |
| 205 ><A | |
| 206 HREF="sdlgetrgb.html" | |
| 207 >Next</A | |
| 208 ></TD | |
| 209 ></TR | |
| 210 ><TR | |
| 211 ><TD | |
| 212 WIDTH="33%" | |
| 213 ALIGN="left" | |
| 214 VALIGN="top" | |
| 215 >SDL_MapRGB</TD | |
| 216 ><TD | |
| 217 WIDTH="34%" | |
| 218 ALIGN="center" | |
| 219 VALIGN="top" | |
| 220 ><A | |
| 221 HREF="video.html" | |
| 222 >Up</A | |
| 223 ></TD | |
| 224 ><TD | |
| 225 WIDTH="33%" | |
| 226 ALIGN="right" | |
| 227 VALIGN="top" | |
| 228 >SDL_GetRGB</TD | |
| 229 ></TR | |
| 230 ></TABLE | |
| 231 ></DIV | |
| 232 ></BODY | |
| 233 ></HTML | |
| 234 > |