Mercurial > sdl-ios-xcode
annotate docs/html/sdlsetpalette.html @ 2328:91e601d9df8b
re: bug#563. checking in some commented out trace code and a fix so that the in testalpha.c the background only flashes when alpha == 255. The problem that is being
fixed is caused by clearing SDL_COPY_RLE_COLORKEY without setting SDL_COPY_RLE_DESIRED in SDL_UnRELSurface.
| author | Bob Pendleton <bob@pendleton.com> |
|---|---|
| date | Fri, 14 Mar 2008 18:17:49 +0000 |
| parents | 355632dca928 |
| children |
| rev | line source |
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| 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 1.76b+ |
| 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_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 | |
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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="sdlsetcolors.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="sdlsetgamma.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="SDLSETPALETTE" | |
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74 ></A |
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75 >SDL_SetPalette</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN1517" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_SetPalette -- Sets the colors in the palette of an 8-bit surface.</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN1520" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN1521" |
| 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_SetPalette</B | |
| 108 ></CODE | |
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109 >(SDL_Surface *surface, int flags, SDL_Color *colors, int firstcolor, int ncolors);</CODE |
| 0 | 110 ></P |
| 111 ><P | |
| 112 ></P | |
| 113 ></DIV | |
| 114 ></DIV | |
| 115 ><DIV | |
| 116 CLASS="REFSECT1" | |
| 117 ><A | |
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118 NAME="AEN1527" |
| 0 | 119 ></A |
| 120 ><H2 | |
| 121 >Description</H2 | |
| 122 ><P | |
| 123 >Sets a portion of the palette for the given 8-bit surface.</P | |
| 124 ><P | |
| 125 >Palettized (8-bit) screen surfaces with the | |
| 126 <TT | |
| 127 CLASS="LITERAL" | |
| 128 >SDL_HWPALETTE</TT | |
| 129 > flag have two palettes, a logical | |
| 130 palette that is used for mapping blits to/from the surface and a | |
| 131 physical palette (that determines how the hardware will map the colors | |
| 132 to the display). <A | |
| 133 HREF="sdlblitsurface.html" | |
| 134 >SDL_BlitSurface</A | |
| 135 > | |
| 136 always uses the logical palette when blitting surfaces (if it has to | |
| 137 convert between surface pixel formats). Because of this, it is often | |
| 138 useful to modify only one or the other palette to achieve various | |
| 139 special color effects (e.g., screen fading, color flashes, screen dimming).</P | |
| 140 ><P | |
| 141 >This function can modify either the logical or physical palette by | |
| 142 specifing <TT | |
| 143 CLASS="LITERAL" | |
| 144 >SDL_LOGPAL</TT | |
| 145 > or | |
| 146 <TT | |
| 147 CLASS="LITERAL" | |
| 148 >SDL_PHYSPAL</TT | |
| 149 >the in the <TT | |
| 150 CLASS="PARAMETER" | |
| 151 ><I | |
| 152 >flags</I | |
| 153 ></TT | |
| 154 > | |
| 155 parameter.</P | |
| 156 ><P | |
| 157 >When <TT | |
| 158 CLASS="PARAMETER" | |
| 159 ><I | |
| 160 >surface</I | |
| 161 ></TT | |
| 162 > is the surface associated with the current | |
| 163 display, the display colormap will be updated with the requested colors. If | |
| 164 <TT | |
| 165 CLASS="LITERAL" | |
| 166 >SDL_HWPALETTE</TT | |
| 167 > was set in <A | |
| 168 HREF="sdlsetvideomode.html" | |
| 169 >SDL_SetVideoMode</A | |
| 170 > flags, | |
| 171 <TT | |
| 172 CLASS="FUNCTION" | |
| 173 >SDL_SetPalette</TT | |
| 174 > will always return <SPAN | |
| 175 CLASS="RETURNVALUE" | |
| 176 >1</SPAN | |
| 177 >, | |
| 178 and the palette is guaranteed to be set the way you desire, even if the window | |
| 179 colormap has to be warped or run under emulation.</P | |
| 180 ><P | |
| 181 >The color components of a | |
| 182 <A | |
| 183 HREF="sdlcolor.html" | |
| 184 ><SPAN | |
| 185 CLASS="STRUCTNAME" | |
| 186 >SDL_Color</SPAN | |
| 187 ></A | |
| 188 > structure | |
| 189 are 8-bits in size, giving you a total of | |
| 190 256<SUP | |
| 191 >3</SUP | |
| 192 >=16777216 colors.</P | |
| 193 ></DIV | |
| 194 ><DIV | |
| 195 CLASS="REFSECT1" | |
| 196 ><A | |
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197 NAME="AEN1547" |
| 0 | 198 ></A |
| 199 ><H2 | |
| 200 >Return Value</H2 | |
| 201 ><P | |
| 202 >If <TT | |
| 203 CLASS="PARAMETER" | |
| 204 ><I | |
| 205 >surface</I | |
| 206 ></TT | |
| 207 > is not a palettized surface, this function | |
| 208 does nothing, returning <SPAN | |
| 209 CLASS="RETURNVALUE" | |
| 210 >0</SPAN | |
| 211 >. If all of the colors were set | |
| 212 as passed to <TT | |
| 213 CLASS="FUNCTION" | |
| 214 >SDL_SetPalette</TT | |
| 215 >, it will return | |
| 216 <SPAN | |
| 217 CLASS="RETURNVALUE" | |
| 218 >1</SPAN | |
| 219 >. If not all the color entries were set exactly as | |
| 220 given, it will return <SPAN | |
| 221 CLASS="RETURNVALUE" | |
| 222 >0</SPAN | |
| 223 >, and you should look at the | |
| 224 surface palette to determine the actual color palette.</P | |
| 225 ></DIV | |
| 226 ><DIV | |
| 227 CLASS="REFSECT1" | |
| 228 ><A | |
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229 NAME="AEN1555" |
| 0 | 230 ></A |
| 231 ><H2 | |
| 232 >Example</H2 | |
| 233 ><PRE | |
| 234 CLASS="PROGRAMLISTING" | |
| 235 > /* Create a display surface with a grayscale palette */ | |
| 236 SDL_Surface *screen; | |
| 237 SDL_Color colors[256]; | |
| 238 int i; | |
| 239 . | |
| 240 . | |
| 241 . | |
| 242 /* Fill colors with color information */ | |
| 243 for(i=0;i<256;i++){ | |
| 244 colors[i].r=i; | |
| 245 colors[i].g=i; | |
| 246 colors[i].b=i; | |
| 247 } | |
| 248 | |
| 249 /* Create display */ | |
| 250 screen=SDL_SetVideoMode(640, 480, 8, SDL_HWPALETTE); | |
| 251 if(!screen){ | |
| 252 printf("Couldn't set video mode: %s\n", SDL_GetError()); | |
| 253 exit(-1); | |
| 254 } | |
| 255 | |
| 256 /* Set palette */ | |
| 257 SDL_SetPalette(screen, SDL_LOGPAL|SDL_PHYSPAL, colors, 0, 256); | |
| 258 . | |
| 259 . | |
| 260 . | |
| 261 .</PRE | |
| 262 ></DIV | |
| 263 ><DIV | |
| 264 CLASS="REFSECT1" | |
| 265 ><A | |
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266 NAME="AEN1558" |
| 0 | 267 ></A |
| 268 ><H2 | |
| 269 >See Also</H2 | |
| 270 ><P | |
| 271 ><A | |
| 272 HREF="sdlsetcolors.html" | |
| 273 >SDL_SetColors</A | |
| 274 >, | |
| 275 <A | |
| 276 HREF="sdlsetvideomode.html" | |
| 277 >SDL_SetVideoMode</A | |
| 278 >, | |
| 279 <A | |
| 280 HREF="sdlsurface.html" | |
| 281 >SDL_Surface</A | |
| 282 >, | |
| 283 <A | |
| 284 HREF="sdlcolor.html" | |
| 285 >SDL_Color</A | |
| 286 ></P | |
| 287 ></DIV | |
| 288 ><DIV | |
| 289 CLASS="NAVFOOTER" | |
| 290 ><HR | |
| 291 ALIGN="LEFT" | |
| 292 WIDTH="100%"><TABLE | |
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293 SUMMARY="Footer navigation table" |
| 0 | 294 WIDTH="100%" |
| 295 BORDER="0" | |
| 296 CELLPADDING="0" | |
| 297 CELLSPACING="0" | |
| 298 ><TR | |
| 299 ><TD | |
| 300 WIDTH="33%" | |
| 301 ALIGN="left" | |
| 302 VALIGN="top" | |
| 303 ><A | |
| 304 HREF="sdlsetcolors.html" | |
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305 ACCESSKEY="P" |
| 0 | 306 >Prev</A |
| 307 ></TD | |
| 308 ><TD | |
| 309 WIDTH="34%" | |
| 310 ALIGN="center" | |
| 311 VALIGN="top" | |
| 312 ><A | |
| 313 HREF="index.html" | |
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314 ACCESSKEY="H" |
| 0 | 315 >Home</A |
| 316 ></TD | |
| 317 ><TD | |
| 318 WIDTH="33%" | |
| 319 ALIGN="right" | |
| 320 VALIGN="top" | |
| 321 ><A | |
| 322 HREF="sdlsetgamma.html" | |
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323 ACCESSKEY="N" |
| 0 | 324 >Next</A |
| 325 ></TD | |
| 326 ></TR | |
| 327 ><TR | |
| 328 ><TD | |
| 329 WIDTH="33%" | |
| 330 ALIGN="left" | |
| 331 VALIGN="top" | |
| 332 >SDL_SetColors</TD | |
| 333 ><TD | |
| 334 WIDTH="34%" | |
| 335 ALIGN="center" | |
| 336 VALIGN="top" | |
| 337 ><A | |
| 338 HREF="video.html" | |
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339 ACCESSKEY="U" |
| 0 | 340 >Up</A |
| 341 ></TD | |
| 342 ><TD | |
| 343 WIDTH="33%" | |
| 344 ALIGN="right" | |
| 345 VALIGN="top" | |
| 346 >SDL_SetGamma</TD | |
| 347 ></TR | |
| 348 ></TABLE | |
| 349 ></DIV | |
| 350 ></BODY | |
| 351 ></HTML | |
| 352 > |