Mercurial > sdl-ios-xcode
annotate docs/html/sdlsetcolorkey.html @ 81:1a2723474f12
Added the SDL_VIDEO_YUV_DIRECT hack for better performance when the
requested video mode is 16 bpp but the real video mode is 32 bpp.
| author | Sam Lantinga <slouken@lokigames.com> |
|---|---|
| date | Mon, 25 Jun 2001 22:16:44 +0000 |
| parents | 55f1f1b3e27d |
| children | e5bc29de3f0a |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_SetColorKey</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_SaveBMP" | |
| 17 HREF="sdlsavebmp.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_SetAlpha" | |
| 20 HREF="sdlsetalpha.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="sdlsavebmp.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="sdlsetalpha.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="SDLSETCOLORKEY" | |
| 71 >SDL_SetColorKey</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
|
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76 NAME="AEN1630" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_SetColorKey -- Sets the color key (transparent pixel) in a blittable surface and | |
| 81 RLE acceleration.</DIV | |
| 82 ><DIV | |
| 83 CLASS="REFSYNOPSISDIV" | |
| 84 ><A | |
|
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|
85 NAME="AEN1633" |
| 0 | 86 ></A |
| 87 ><H2 | |
| 88 >Synopsis</H2 | |
| 89 ><DIV | |
| 90 CLASS="FUNCSYNOPSIS" | |
| 91 ><A | |
|
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changeset
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92 NAME="AEN1634" |
| 0 | 93 ></A |
| 94 ><P | |
| 95 ></P | |
| 96 ><PRE | |
| 97 CLASS="FUNCSYNOPSISINFO" | |
| 98 >#include "SDL.h"</PRE | |
| 99 ><P | |
| 100 ><CODE | |
| 101 ><CODE | |
| 102 CLASS="FUNCDEF" | |
| 103 >int <B | |
| 104 CLASS="FSFUNC" | |
| 105 >SDL_SetColorKey</B | |
| 106 ></CODE | |
| 107 >(SDL_Surface *surface, Uint32 flag, Uint32 key);</CODE | |
| 108 ></P | |
| 109 ><P | |
| 110 ></P | |
| 111 ></DIV | |
| 112 ></DIV | |
| 113 ><DIV | |
| 114 CLASS="REFSECT1" | |
| 115 ><A | |
|
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diff
changeset
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116 NAME="AEN1640" |
| 0 | 117 ></A |
| 118 ><H2 | |
| 119 >Description</H2 | |
| 120 ><P | |
| 121 > Sets the color key (transparent pixel) in a blittable surface and enables or | |
| 122 disables RLE blit acceleration.</P | |
| 123 ><P | |
| 124 >RLE acceleration can substantially speed up blitting of images with large | |
| 125 horizontal runs of transparent pixels (i.e., pixels that match the | |
| 126 <TT | |
| 127 CLASS="PARAMETER" | |
| 128 ><I | |
| 129 >key</I | |
| 130 ></TT | |
| 131 > value). The <TT | |
| 132 CLASS="PARAMETER" | |
| 133 ><I | |
| 134 >key</I | |
| 135 ></TT | |
| 136 > must be of the same pixel format as the <TT | |
| 137 CLASS="PARAMETER" | |
| 138 ><I | |
| 139 >surface</I | |
| 140 ></TT | |
| 141 >, <A | |
| 142 HREF="sdlmaprgb.html" | |
| 143 ><TT | |
| 144 CLASS="FUNCTION" | |
| 145 >SDL_MapRGB</TT | |
| 146 ></A | |
| 147 > is often useful for obtaining an acceptable value.</P | |
| 148 ><P | |
| 149 >If <TT | |
| 150 CLASS="PARAMETER" | |
| 151 ><I | |
| 152 >flag</I | |
| 153 ></TT | |
| 154 > is <TT | |
| 155 CLASS="LITERAL" | |
| 156 >SDL_SRCCOLORKEY</TT | |
| 157 > then | |
| 158 <TT | |
| 159 CLASS="PARAMETER" | |
| 160 ><I | |
| 161 >key</I | |
| 162 ></TT | |
| 163 > is the transparent pixel value in the source image of a | |
| 164 blit.</P | |
| 165 ><P | |
| 166 >If <TT | |
| 167 CLASS="PARAMETER" | |
| 168 ><I | |
| 169 >flag</I | |
| 170 ></TT | |
| 171 > is OR'd with | |
| 172 <TT | |
| 173 CLASS="LITERAL" | |
| 174 >SDL_RLEACCEL</TT | |
| 175 > then the surface will be draw using RLE | |
| 176 acceleration when drawn with | |
| 177 <A | |
| 178 HREF="sdlblitsurface.html" | |
| 179 >SDL_BlitSurface</A | |
| 180 >. The surface will | |
| 181 actually be encoded for RLE acceleration the first time | |
| 182 <A | |
| 183 HREF="sdlblitsurface.html" | |
| 184 >SDL_BlitSurface</A | |
| 185 > or | |
| 186 <A | |
| 187 HREF="sdldisplayformat.html" | |
| 188 >SDL_DisplayFormat</A | |
| 189 > is called on the | |
| 190 surface.</P | |
| 191 ><P | |
| 192 >If <TT | |
| 193 CLASS="PARAMETER" | |
| 194 ><I | |
| 195 >flag</I | |
| 196 ></TT | |
| 197 > is 0, this function clears | |
| 198 any current color key.</P | |
| 199 ></DIV | |
| 200 ><DIV | |
| 201 CLASS="REFSECT1" | |
| 202 ><A | |
|
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55f1f1b3e27d
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Sam Lantinga <slouken@lokigames.com>
parents:
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diff
changeset
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203 NAME="AEN1661" |
| 0 | 204 ></A |
| 205 ><H2 | |
| 206 >Return Value</H2 | |
| 207 ><P | |
| 208 >This function returns <SPAN | |
| 209 CLASS="RETURNVALUE" | |
| 210 >0</SPAN | |
| 211 >, or | |
| 212 <SPAN | |
| 213 CLASS="RETURNVALUE" | |
| 214 >-1</SPAN | |
| 215 > if there was an error.</P | |
| 216 ></DIV | |
| 217 ><DIV | |
| 218 CLASS="REFSECT1" | |
| 219 ><A | |
|
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55f1f1b3e27d
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Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
220 NAME="AEN1666" |
| 0 | 221 ></A |
| 222 ><H2 | |
| 223 >See Also</H2 | |
| 224 ><P | |
| 225 ><A | |
| 226 HREF="sdlblitsurface.html" | |
| 227 ><TT | |
| 228 CLASS="FUNCTION" | |
| 229 >SDL_BlitSurface</TT | |
| 230 ></A | |
| 231 >, | |
| 232 <A | |
| 233 HREF="sdldisplayformat.html" | |
| 234 ><TT | |
| 235 CLASS="FUNCTION" | |
| 236 >SDL_DisplayFormat</TT | |
| 237 ></A | |
| 238 >, | |
| 239 <A | |
| 240 HREF="sdlmaprgb.html" | |
| 241 ><TT | |
| 242 CLASS="FUNCTION" | |
| 243 >SDL_MapRGB</TT | |
| 244 ></A | |
| 245 >, | |
| 246 <A | |
| 247 HREF="sdlsetalpha.html" | |
| 248 ><TT | |
| 249 CLASS="FUNCTION" | |
| 250 >SDL_SetAlpha</TT | |
| 251 ></A | |
| 252 ></P | |
| 253 ></DIV | |
| 254 ><DIV | |
| 255 CLASS="NAVFOOTER" | |
| 256 ><HR | |
| 257 ALIGN="LEFT" | |
| 258 WIDTH="100%"><TABLE | |
| 259 WIDTH="100%" | |
| 260 BORDER="0" | |
| 261 CELLPADDING="0" | |
| 262 CELLSPACING="0" | |
| 263 ><TR | |
| 264 ><TD | |
| 265 WIDTH="33%" | |
| 266 ALIGN="left" | |
| 267 VALIGN="top" | |
| 268 ><A | |
| 269 HREF="sdlsavebmp.html" | |
| 270 >Prev</A | |
| 271 ></TD | |
| 272 ><TD | |
| 273 WIDTH="34%" | |
| 274 ALIGN="center" | |
| 275 VALIGN="top" | |
| 276 ><A | |
| 277 HREF="index.html" | |
| 278 >Home</A | |
| 279 ></TD | |
| 280 ><TD | |
| 281 WIDTH="33%" | |
| 282 ALIGN="right" | |
| 283 VALIGN="top" | |
| 284 ><A | |
| 285 HREF="sdlsetalpha.html" | |
| 286 >Next</A | |
| 287 ></TD | |
| 288 ></TR | |
| 289 ><TR | |
| 290 ><TD | |
| 291 WIDTH="33%" | |
| 292 ALIGN="left" | |
| 293 VALIGN="top" | |
| 294 >SDL_SaveBMP</TD | |
| 295 ><TD | |
| 296 WIDTH="34%" | |
| 297 ALIGN="center" | |
| 298 VALIGN="top" | |
| 299 ><A | |
| 300 HREF="video.html" | |
| 301 >Up</A | |
| 302 ></TD | |
| 303 ><TD | |
| 304 WIDTH="33%" | |
| 305 ALIGN="right" | |
| 306 VALIGN="top" | |
| 307 >SDL_SetAlpha</TD | |
| 308 ></TR | |
| 309 ></TABLE | |
| 310 ></DIV | |
| 311 ></BODY | |
| 312 ></HTML | |
| 313 > |