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annotate docs/html/sdlsetpalette.html @ 147:8f9093e805c9
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 09 Aug 2001 13:06:32 +0000 |
| parents | 55f1f1b3e27d |
| children | e5bc29de3f0a |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_SetPalette</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_SetColors" | |
| 17 HREF="sdlsetcolors.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_SetGamma" | |
| 20 HREF="sdlsetgamma.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="sdlsetcolors.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="sdlsetgamma.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="SDLSETPALETTE" | |
| 71 >SDL_SetPalette</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
|
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76 NAME="AEN1102" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_SetPalette -- Sets the colors in the palette of an 8-bit surface.</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSYNOPSISDIV" | |
| 83 ><A | |
|
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84 NAME="AEN1105" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Synopsis</H2 | |
| 88 ><DIV | |
| 89 CLASS="FUNCSYNOPSIS" | |
| 90 ><A | |
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91 NAME="AEN1106" |
| 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_SetPalette</B | |
| 105 ></CODE | |
|
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106 >(SDL_Surface *surface, int flags, SDL_Color *colors, int firstcolor, int ncolors);</CODE |
| 0 | 107 ></P |
| 108 ><P | |
| 109 ></P | |
| 110 ></DIV | |
| 111 ></DIV | |
| 112 ><DIV | |
| 113 CLASS="REFSECT1" | |
| 114 ><A | |
|
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115 NAME="AEN1112" |
| 0 | 116 ></A |
| 117 ><H2 | |
| 118 >Description</H2 | |
| 119 ><P | |
| 120 >Sets a portion of the palette for the given 8-bit surface.</P | |
| 121 ><P | |
| 122 >Palettized (8-bit) screen surfaces with the | |
| 123 <TT | |
| 124 CLASS="LITERAL" | |
| 125 >SDL_HWPALETTE</TT | |
| 126 > flag have two palettes, a logical | |
| 127 palette that is used for mapping blits to/from the surface and a | |
| 128 physical palette (that determines how the hardware will map the colors | |
| 129 to the display). <A | |
| 130 HREF="sdlblitsurface.html" | |
| 131 >SDL_BlitSurface</A | |
| 132 > | |
| 133 always uses the logical palette when blitting surfaces (if it has to | |
| 134 convert between surface pixel formats). Because of this, it is often | |
| 135 useful to modify only one or the other palette to achieve various | |
| 136 special color effects (e.g., screen fading, color flashes, screen dimming).</P | |
| 137 ><P | |
| 138 >This function can modify either the logical or physical palette by | |
| 139 specifing <TT | |
| 140 CLASS="LITERAL" | |
| 141 >SDL_LOGPAL</TT | |
| 142 > or | |
| 143 <TT | |
| 144 CLASS="LITERAL" | |
| 145 >SDL_PHYSPAL</TT | |
| 146 >the in the <TT | |
| 147 CLASS="PARAMETER" | |
| 148 ><I | |
| 149 >flags</I | |
| 150 ></TT | |
| 151 > | |
| 152 parameter.</P | |
| 153 ><P | |
| 154 >When <TT | |
| 155 CLASS="PARAMETER" | |
| 156 ><I | |
| 157 >surface</I | |
| 158 ></TT | |
| 159 > is the surface associated with the current | |
| 160 display, the display colormap will be updated with the requested colors. If | |
| 161 <TT | |
| 162 CLASS="LITERAL" | |
| 163 >SDL_HWPALETTE</TT | |
| 164 > was set in <A | |
| 165 HREF="sdlsetvideomode.html" | |
| 166 >SDL_SetVideoMode</A | |
| 167 > flags, | |
| 168 <TT | |
| 169 CLASS="FUNCTION" | |
| 170 >SDL_SetPalette</TT | |
| 171 > will always return <SPAN | |
| 172 CLASS="RETURNVALUE" | |
| 173 >1</SPAN | |
| 174 >, | |
| 175 and the palette is guaranteed to be set the way you desire, even if the window | |
| 176 colormap has to be warped or run under emulation.</P | |
| 177 ><P | |
| 178 >The color components of a | |
| 179 <A | |
| 180 HREF="sdlcolor.html" | |
| 181 ><SPAN | |
| 182 CLASS="STRUCTNAME" | |
| 183 >SDL_Color</SPAN | |
| 184 ></A | |
| 185 > structure | |
| 186 are 8-bits in size, giving you a total of | |
| 187 256<SUP | |
| 188 >3</SUP | |
| 189 >=16777216 colors.</P | |
| 190 ></DIV | |
| 191 ><DIV | |
| 192 CLASS="REFSECT1" | |
| 193 ><A | |
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194 NAME="AEN1132" |
| 0 | 195 ></A |
| 196 ><H2 | |
| 197 >Return Value</H2 | |
| 198 ><P | |
| 199 >If <TT | |
| 200 CLASS="PARAMETER" | |
| 201 ><I | |
| 202 >surface</I | |
| 203 ></TT | |
| 204 > is not a palettized surface, this function | |
| 205 does nothing, returning <SPAN | |
| 206 CLASS="RETURNVALUE" | |
| 207 >0</SPAN | |
| 208 >. If all of the colors were set | |
| 209 as passed to <TT | |
| 210 CLASS="FUNCTION" | |
| 211 >SDL_SetPalette</TT | |
| 212 >, it will return | |
| 213 <SPAN | |
| 214 CLASS="RETURNVALUE" | |
| 215 >1</SPAN | |
| 216 >. If not all the color entries were set exactly as | |
| 217 given, it will return <SPAN | |
| 218 CLASS="RETURNVALUE" | |
| 219 >0</SPAN | |
| 220 >, and you should look at the | |
| 221 surface palette to determine the actual color palette.</P | |
| 222 ></DIV | |
| 223 ><DIV | |
| 224 CLASS="REFSECT1" | |
| 225 ><A | |
|
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226 NAME="AEN1140" |
| 0 | 227 ></A |
| 228 ><H2 | |
| 229 >Example</H2 | |
| 230 ><PRE | |
| 231 CLASS="PROGRAMLISTING" | |
| 232 > /* Create a display surface with a grayscale palette */ | |
| 233 SDL_Surface *screen; | |
| 234 SDL_Color colors[256]; | |
| 235 int i; | |
| 236 . | |
| 237 . | |
| 238 . | |
| 239 /* Fill colors with color information */ | |
| 240 for(i=0;i<256;i++){ | |
| 241 colors[i].r=i; | |
| 242 colors[i].g=i; | |
| 243 colors[i].b=i; | |
| 244 } | |
| 245 | |
| 246 /* Create display */ | |
| 247 screen=SDL_SetVideoMode(640, 480, 8, SDL_HWPALETTE); | |
| 248 if(!screen){ | |
| 249 printf("Couldn't set video mode: %s\n", SDL_GetError()); | |
| 250 exit(-1); | |
| 251 } | |
| 252 | |
| 253 /* Set palette */ | |
| 254 SDL_SetPalette(screen, SDL_LOGPAL|SDL_PHYSPAL, colors, 0, 256); | |
| 255 . | |
| 256 . | |
| 257 . | |
| 258 .</PRE | |
| 259 ></DIV | |
| 260 ><DIV | |
| 261 CLASS="REFSECT1" | |
| 262 ><A | |
|
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263 NAME="AEN1143" |
| 0 | 264 ></A |
| 265 ><H2 | |
| 266 >See Also</H2 | |
| 267 ><P | |
| 268 ><A | |
| 269 HREF="sdlsetcolors.html" | |
| 270 >SDL_SetColors</A | |
| 271 >, | |
| 272 <A | |
| 273 HREF="sdlsetvideomode.html" | |
| 274 >SDL_SetVideoMode</A | |
| 275 >, | |
| 276 <A | |
| 277 HREF="sdlsurface.html" | |
| 278 >SDL_Surface</A | |
| 279 >, | |
| 280 <A | |
| 281 HREF="sdlcolor.html" | |
| 282 >SDL_Color</A | |
| 283 ></P | |
| 284 ></DIV | |
| 285 ><DIV | |
| 286 CLASS="NAVFOOTER" | |
| 287 ><HR | |
| 288 ALIGN="LEFT" | |
| 289 WIDTH="100%"><TABLE | |
| 290 WIDTH="100%" | |
| 291 BORDER="0" | |
| 292 CELLPADDING="0" | |
| 293 CELLSPACING="0" | |
| 294 ><TR | |
| 295 ><TD | |
| 296 WIDTH="33%" | |
| 297 ALIGN="left" | |
| 298 VALIGN="top" | |
| 299 ><A | |
| 300 HREF="sdlsetcolors.html" | |
| 301 >Prev</A | |
| 302 ></TD | |
| 303 ><TD | |
| 304 WIDTH="34%" | |
| 305 ALIGN="center" | |
| 306 VALIGN="top" | |
| 307 ><A | |
| 308 HREF="index.html" | |
| 309 >Home</A | |
| 310 ></TD | |
| 311 ><TD | |
| 312 WIDTH="33%" | |
| 313 ALIGN="right" | |
| 314 VALIGN="top" | |
| 315 ><A | |
| 316 HREF="sdlsetgamma.html" | |
| 317 >Next</A | |
| 318 ></TD | |
| 319 ></TR | |
| 320 ><TR | |
| 321 ><TD | |
| 322 WIDTH="33%" | |
| 323 ALIGN="left" | |
| 324 VALIGN="top" | |
| 325 >SDL_SetColors</TD | |
| 326 ><TD | |
| 327 WIDTH="34%" | |
| 328 ALIGN="center" | |
| 329 VALIGN="top" | |
| 330 ><A | |
| 331 HREF="video.html" | |
| 332 >Up</A | |
| 333 ></TD | |
| 334 ><TD | |
| 335 WIDTH="33%" | |
| 336 ALIGN="right" | |
| 337 VALIGN="top" | |
| 338 >SDL_SetGamma</TD | |
| 339 ></TR | |
| 340 ></TABLE | |
| 341 ></DIV | |
| 342 ></BODY | |
| 343 ></HTML | |
| 344 > |