Mercurial > sdl-ios-xcode
annotate docs/html/sdlsetpalette.html @ 3335:b8d313de8a65
Adam Strzelecki to SDL
Since current DirectFB implementation is incomplete for YUV surfaces (actually causes segmentation faults when trying Lock and use YUV planar textures) I decided to fix it a bit.
Here's a patch that should make DirectFB properly support YUV both packed and planar (3 planes).
(1) Removed SDL_BYTESPERPIXEL at all in favor of DFB_BYTES_PER_PIXEL(SDLToDFBPixelFormat(fmt)) which does return always proper BPP for YUVs too, coz SDL_BYTESPERPIXEL returns incorrect values for FOURCCs
(2) Fixed data->pixels allocation for planar YUVs in CreateTexture, it should allocate 150% more space
(3) Copy other planes for planar YUVs in UpdateTexture
(4) Moved checking if format is supported at all with DirectFB on CreateTexture at the beginning of the code
Waiting for comments,
--
Adam Strzelecki | nanoant.com
| author | Sam Lantinga <slouken@libsdl.org> |
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| date | Sun, 04 Oct 2009 04:03:37 +0000 |
| parents | 355632dca928 |
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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 > |