Mercurial > sdl-ios-xcode
annotate docs/html/sdlsetcolors.html @ 4928:930614179450 SDL-1.2
Patch from Haiku's Google Code-In student Daniel Marth, fixes an off-by-one issue in bwindow.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 03 Dec 2010 16:55:25 -0800 |
| parents | 355632dca928 |
| children |
| rev | line source |
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| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_SetColors</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_Flip" | |
| 17 HREF="sdlflip.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_SetPalette" | |
| 20 HREF="sdlsetpalette.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="sdlflip.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="sdlsetpalette.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="SDLSETCOLORS" | |
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74 ></A |
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75 >SDL_SetColors</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN1462" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_SetColors -- Sets a portion of the colormap for the given 8-bit surface.</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN1465" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN1466" |
| 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_SetColors</B | |
| 108 ></CODE | |
| 109 >(SDL_Surface *surface, SDL_Color *colors, int firstcolor, int ncolors);</CODE | |
| 110 ></P | |
| 111 ><P | |
| 112 ></P | |
| 113 ></DIV | |
| 114 ></DIV | |
| 115 ><DIV | |
| 116 CLASS="REFSECT1" | |
| 117 ><A | |
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118 NAME="AEN1472" |
| 0 | 119 ></A |
| 120 ><H2 | |
| 121 >Description</H2 | |
| 122 ><P | |
| 123 >Sets a portion of the colormap for the given 8-bit surface.</P | |
| 124 ><P | |
| 125 >When <TT | |
| 126 CLASS="PARAMETER" | |
| 127 ><I | |
| 128 >surface</I | |
| 129 ></TT | |
| 130 > is the surface associated with the current | |
| 131 display, the display colormap will be updated with the requested colors. If | |
| 132 <TT | |
| 133 CLASS="LITERAL" | |
| 134 >SDL_HWPALETTE</TT | |
| 135 > was set in <A | |
| 136 HREF="sdlsetvideomode.html" | |
| 137 >SDL_SetVideoMode</A | |
| 138 > flags, | |
| 139 <TT | |
| 140 CLASS="FUNCTION" | |
| 141 >SDL_SetColors</TT | |
| 142 > will always return <SPAN | |
| 143 CLASS="RETURNVALUE" | |
| 144 >1</SPAN | |
| 145 >, | |
| 146 and the palette is guaranteed to be set the way you desire, even if the window | |
| 147 colormap has to be warped or run under emulation.</P | |
| 148 ><P | |
| 149 >The color components of a | |
| 150 <A | |
| 151 HREF="sdlcolor.html" | |
| 152 ><SPAN | |
| 153 CLASS="STRUCTNAME" | |
| 154 >SDL_Color</SPAN | |
| 155 ></A | |
| 156 > | |
| 157 structure are 8-bits in size, giving you a total of 256<SUP | |
| 158 >3</SUP | |
| 159 > | |
| 160 =16777216 colors.</P | |
| 161 ><P | |
| 162 >Palettized (8-bit) screen surfaces with the <TT | |
| 163 CLASS="LITERAL" | |
| 164 >SDL_HWPALETTE</TT | |
| 165 > | |
| 166 flag have two palettes, a logical palette that is used for mapping blits | |
| 167 to/from the surface and a physical palette (that determines how the | |
| 168 hardware will map the colors to the display). <TT | |
| 169 CLASS="FUNCTION" | |
| 170 >SDL_SetColors</TT | |
| 171 > | |
| 172 modifies both palettes (if present), and is equivalent to calling | |
| 173 <A | |
| 174 HREF="sdlsetpalette.html" | |
| 175 >SDL_SetPalette</A | |
| 176 > with the | |
| 177 <TT | |
| 178 CLASS="PARAMETER" | |
| 179 ><I | |
| 180 >flags</I | |
| 181 ></TT | |
| 182 > set to | |
| 183 <TT | |
| 184 CLASS="LITERAL" | |
| 185 >(SDL_LOGPAL | SDL_PHYSPAL)</TT | |
| 186 >.</P | |
| 187 ></DIV | |
| 188 ><DIV | |
| 189 CLASS="REFSECT1" | |
| 190 ><A | |
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191 NAME="AEN1491" |
| 0 | 192 ></A |
| 193 ><H2 | |
| 194 >Return Value</H2 | |
| 195 ><P | |
| 196 >If <TT | |
| 197 CLASS="PARAMETER" | |
| 198 ><I | |
| 199 >surface</I | |
| 200 ></TT | |
| 201 > is not a palettized surface, this function | |
| 202 does nothing, returning <SPAN | |
| 203 CLASS="RETURNVALUE" | |
| 204 >0</SPAN | |
| 205 >. If all of the colors were set | |
| 206 as passed to <TT | |
| 207 CLASS="FUNCTION" | |
| 208 >SDL_SetColors</TT | |
| 209 >, it will return | |
| 210 <SPAN | |
| 211 CLASS="RETURNVALUE" | |
| 212 >1</SPAN | |
| 213 >. If not all the color entries were set exactly as | |
| 214 given, it will return <SPAN | |
| 215 CLASS="RETURNVALUE" | |
| 216 >0</SPAN | |
| 217 >, and you should look at the | |
| 218 surface palette to determine the actual color palette.</P | |
| 219 ></DIV | |
| 220 ><DIV | |
| 221 CLASS="REFSECT1" | |
| 222 ><A | |
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223 NAME="AEN1499" |
| 0 | 224 ></A |
| 225 ><H2 | |
| 226 >Example</H2 | |
| 227 ><PRE | |
| 228 CLASS="PROGRAMLISTING" | |
| 229 >/* Create a display surface with a grayscale palette */ | |
| 230 SDL_Surface *screen; | |
| 231 SDL_Color colors[256]; | |
| 232 int i; | |
| 233 . | |
| 234 . | |
| 235 . | |
| 236 /* Fill colors with color information */ | |
| 237 for(i=0;i<256;i++){ | |
| 238 colors[i].r=i; | |
| 239 colors[i].g=i; | |
| 240 colors[i].b=i; | |
| 241 } | |
| 242 | |
| 243 /* Create display */ | |
| 244 screen=SDL_SetVideoMode(640, 480, 8, SDL_HWPALETTE); | |
| 245 if(!screen){ | |
| 246 printf("Couldn't set video mode: %s\n", SDL_GetError()); | |
| 247 exit(-1); | |
| 248 } | |
| 249 | |
| 250 /* Set palette */ | |
| 251 SDL_SetColors(screen, colors, 0, 256); | |
| 252 . | |
| 253 . | |
| 254 . | |
| 255 .</PRE | |
| 256 ></DIV | |
| 257 ><DIV | |
| 258 CLASS="REFSECT1" | |
| 259 ><A | |
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260 NAME="AEN1502" |
| 0 | 261 ></A |
| 262 ><H2 | |
| 263 >See Also</H2 | |
| 264 ><P | |
| 265 ><A | |
| 266 HREF="sdlcolor.html" | |
| 267 ><SPAN | |
| 268 CLASS="STRUCTNAME" | |
| 269 >SDL_Color</SPAN | |
| 270 ></A | |
| 271 > | |
| 272 <A | |
| 273 HREF="sdlsurface.html" | |
| 274 ><SPAN | |
| 275 CLASS="STRUCTNAME" | |
| 276 >SDL_Surface</SPAN | |
| 277 ></A | |
| 278 >, | |
| 279 <A | |
| 280 HREF="sdlsetpalette.html" | |
| 281 ><TT | |
| 282 CLASS="FUNCTION" | |
| 283 >SDL_SetPalette</TT | |
| 284 ></A | |
| 285 >, | |
| 286 <A | |
| 287 HREF="sdlsetvideomode.html" | |
| 288 ><TT | |
| 289 CLASS="FUNCTION" | |
| 290 >SDL_SetVideoMode</TT | |
| 291 ></A | |
| 292 ></P | |
| 293 ></DIV | |
| 294 ><DIV | |
| 295 CLASS="NAVFOOTER" | |
| 296 ><HR | |
| 297 ALIGN="LEFT" | |
| 298 WIDTH="100%"><TABLE | |
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299 SUMMARY="Footer navigation table" |
| 0 | 300 WIDTH="100%" |
| 301 BORDER="0" | |
| 302 CELLPADDING="0" | |
| 303 CELLSPACING="0" | |
| 304 ><TR | |
| 305 ><TD | |
| 306 WIDTH="33%" | |
| 307 ALIGN="left" | |
| 308 VALIGN="top" | |
| 309 ><A | |
| 310 HREF="sdlflip.html" | |
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311 ACCESSKEY="P" |
| 0 | 312 >Prev</A |
| 313 ></TD | |
| 314 ><TD | |
| 315 WIDTH="34%" | |
| 316 ALIGN="center" | |
| 317 VALIGN="top" | |
| 318 ><A | |
| 319 HREF="index.html" | |
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320 ACCESSKEY="H" |
| 0 | 321 >Home</A |
| 322 ></TD | |
| 323 ><TD | |
| 324 WIDTH="33%" | |
| 325 ALIGN="right" | |
| 326 VALIGN="top" | |
| 327 ><A | |
| 328 HREF="sdlsetpalette.html" | |
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329 ACCESSKEY="N" |
| 0 | 330 >Next</A |
| 331 ></TD | |
| 332 ></TR | |
| 333 ><TR | |
| 334 ><TD | |
| 335 WIDTH="33%" | |
| 336 ALIGN="left" | |
| 337 VALIGN="top" | |
| 338 >SDL_Flip</TD | |
| 339 ><TD | |
| 340 WIDTH="34%" | |
| 341 ALIGN="center" | |
| 342 VALIGN="top" | |
| 343 ><A | |
| 344 HREF="video.html" | |
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345 ACCESSKEY="U" |
| 0 | 346 >Up</A |
| 347 ></TD | |
| 348 ><TD | |
| 349 WIDTH="33%" | |
| 350 ALIGN="right" | |
| 351 VALIGN="top" | |
| 352 >SDL_SetPalette</TD | |
| 353 ></TR | |
| 354 ></TABLE | |
| 355 ></DIV | |
| 356 ></BODY | |
| 357 ></HTML | |
| 358 > |