Mercurial > sdl-ios-xcode
annotate docs/html/sdlsetalpha.html @ 2208:b03710fb0333
Fixed bug #467
Remove trailing commas from enums
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 22 Jul 2007 13:22:47 +0000 |
| parents | 355632dca928 |
| children |
| rev | line source |
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| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_SetAlpha</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_SetColorKey" | |
| 17 HREF="sdlsetcolorkey.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_SetClipRect" | |
| 20 HREF="sdlsetcliprect.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="sdlsetcolorkey.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="sdlsetcliprect.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="SDLSETALPHA" | |
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74 ></A |
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75 >SDL_SetAlpha</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN2096" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_SetAlpha -- Adjust the alpha properties of a surface</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN2099" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN2100" |
| 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_SetAlpha</B | |
| 108 ></CODE | |
| 109 >(SDL_Surface *surface, Uint32 flag, Uint8 alpha);</CODE | |
| 110 ></P | |
| 111 ><P | |
| 112 ></P | |
| 113 ></DIV | |
| 114 ></DIV | |
| 115 ><DIV | |
| 116 CLASS="REFSECT1" | |
| 117 ><A | |
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118 NAME="AEN2106" |
| 0 | 119 ></A |
| 120 ><H2 | |
| 121 >Description</H2 | |
| 122 ><DIV | |
| 123 CLASS="NOTE" | |
| 124 ><BLOCKQUOTE | |
| 125 CLASS="NOTE" | |
| 126 ><P | |
| 127 ><B | |
| 128 >Note: </B | |
| 129 >This function and the semantics of SDL alpha blending have changed since version 1.1.4. Up until version 1.1.5, an alpha value of 0 was considered opaque and a value of 255 was considered transparent. This has now been inverted: 0 (<TT | |
| 130 CLASS="LITERAL" | |
| 131 >SDL_ALPHA_TRANSPARENT</TT | |
| 132 >) is now considered transparent and 255 (<TT | |
| 133 CLASS="LITERAL" | |
| 134 >SDL_ALPHA_OPAQUE</TT | |
| 135 >) is now considered opaque.</P | |
| 136 ></BLOCKQUOTE | |
| 137 ></DIV | |
| 138 ><P | |
| 139 ><TT | |
| 140 CLASS="FUNCTION" | |
| 141 >SDL_SetAlpha</TT | |
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142 > is used for setting the per-surface alpha |
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143 value and/or enabling and disabling alpha blending.</P |
| 0 | 144 ><P |
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145 >The<TT |
| 0 | 146 CLASS="PARAMETER" |
| 147 ><I | |
| 148 >surface</I | |
| 149 ></TT | |
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150 > parameter specifies which surface whose alpha |
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151 attributes you wish to adjust. <TT |
| 0 | 152 CLASS="PARAMETER" |
| 153 ><I | |
| 154 >flags</I | |
| 155 ></TT | |
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156 > is used to specify |
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157 whether alpha blending should be used (<TT |
| 0 | 158 CLASS="LITERAL" |
| 159 >SDL_SRCALPHA</TT | |
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160 >) and |
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161 whether the surface should use RLE acceleration for blitting |
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162 (<TT |
| 0 | 163 CLASS="LITERAL" |
| 164 >SDL_RLEACCEL</TT | |
| 165 >). <TT | |
| 166 CLASS="PARAMETER" | |
| 167 ><I | |
| 168 >flags</I | |
| 169 ></TT | |
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170 > can be an OR'd |
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171 combination of these two options, one of these options or 0. If |
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172 <TT |
| 0 | 173 CLASS="LITERAL" |
| 174 >SDL_SRCALPHA</TT | |
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175 > is not passed as a flag then all alpha |
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176 information is ignored when blitting the surface. The |
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177 <TT |
| 0 | 178 CLASS="PARAMETER" |
| 179 ><I | |
| 180 >alpha</I | |
| 181 ></TT | |
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182 > parameter is the per-surface alpha value; a |
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183 surface need not have an alpha channel to use per-surface alpha and blitting |
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184 can still be accelerated with <TT |
| 0 | 185 CLASS="LITERAL" |
| 186 >SDL_RLEACCEL</TT | |
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187 >.</P |
| 0 | 188 ><DIV |
| 189 CLASS="NOTE" | |
| 190 ><BLOCKQUOTE | |
| 191 CLASS="NOTE" | |
| 192 ><P | |
| 193 ><B | |
| 194 >Note: </B | |
|
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195 >The per-surface alpha value of 128 is considered a special case and |
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196 is optimised, so it's much faster than other per-surface values.</P |
| 0 | 197 ></BLOCKQUOTE |
| 198 ></DIV | |
| 199 ><P | |
| 200 >Alpha effects surface blitting in the following ways:</P | |
| 201 ><DIV | |
| 202 CLASS="INFORMALTABLE" | |
| 203 ><A | |
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204 NAME="AEN2126" |
| 0 | 205 ></A |
| 206 ><P | |
| 207 ></P | |
| 208 ><TABLE | |
| 209 BORDER="0" | |
| 210 CLASS="CALSTABLE" | |
| 211 ><TBODY | |
| 212 ><TR | |
| 213 ><TD | |
| 214 ALIGN="LEFT" | |
| 215 VALIGN="TOP" | |
| 216 >RGBA->RGB with <TT | |
| 217 CLASS="LITERAL" | |
| 218 >SDL_SRCALPHA</TT | |
| 219 ></TD | |
| 220 ><TD | |
| 221 ALIGN="LEFT" | |
| 222 VALIGN="TOP" | |
| 223 ><P | |
| 224 >The source is alpha-blended with the destination, using the alpha channel. <TT | |
| 225 CLASS="LITERAL" | |
| 226 >SDL_SRCCOLORKEY</TT | |
| 227 > and the per-surface alpha are ignored.</P | |
| 228 ></TD | |
| 229 ></TR | |
| 230 ><TR | |
| 231 ><TD | |
| 232 ALIGN="LEFT" | |
| 233 VALIGN="TOP" | |
| 234 >RGBA->RGB without <TT | |
| 235 CLASS="LITERAL" | |
| 236 >SDL_SRCALPHA</TT | |
| 237 ></TD | |
| 238 ><TD | |
| 239 ALIGN="LEFT" | |
| 240 VALIGN="TOP" | |
| 241 ><P | |
| 242 >The RGB data is copied from the source. The source alpha channel and the per-surface alpha value are ignored.</P | |
| 243 ></TD | |
| 244 ></TR | |
| 245 ><TR | |
| 246 ><TD | |
| 247 ALIGN="LEFT" | |
| 248 VALIGN="TOP" | |
| 249 >RGB->RGBA with <TT | |
| 250 CLASS="LITERAL" | |
| 251 >SDL_SRCALPHA</TT | |
| 252 ></TD | |
| 253 ><TD | |
| 254 ALIGN="LEFT" | |
| 255 VALIGN="TOP" | |
| 256 ><P | |
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257 >The source is alpha-blended with the destination using the per-surface alpha |
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258 value. If <TT |
| 0 | 259 CLASS="LITERAL" |
| 260 >SDL_SRCCOLORKEY</TT | |
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261 > is set, only the pixels not |
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262 matching the colorkey value are copied. The alpha channel of the copied pixels |
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263 is set to opaque.</P |
| 0 | 264 ></TD |
| 265 ></TR | |
| 266 ><TR | |
| 267 ><TD | |
| 268 ALIGN="LEFT" | |
| 269 VALIGN="TOP" | |
| 270 >RGB->RGBA without <TT | |
| 271 CLASS="LITERAL" | |
| 272 >SDL_SRCALPHA</TT | |
| 273 ></TD | |
| 274 ><TD | |
| 275 ALIGN="LEFT" | |
| 276 VALIGN="TOP" | |
| 277 ><P | |
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278 >The RGB data is copied from the source and the alpha value of the copied pixels |
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279 is set to opaque. If <TT |
| 0 | 280 CLASS="LITERAL" |
| 281 >SDL_SRCCOLORKEY</TT | |
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282 > is set, only the pixels |
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283 not matching the colorkey value are copied. </P |
| 0 | 284 ></TD |
| 285 ></TR | |
| 286 ><TR | |
| 287 ><TD | |
| 288 ALIGN="LEFT" | |
| 289 VALIGN="TOP" | |
| 290 >RGBA->RGBA with <TT | |
| 291 CLASS="LITERAL" | |
| 292 >SDL_SRCALPHA</TT | |
| 293 ></TD | |
| 294 ><TD | |
| 295 ALIGN="LEFT" | |
| 296 VALIGN="TOP" | |
| 297 ><P | |
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298 >The source is alpha-blended with the destination using the source alpha |
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299 channel. The alpha channel in the destination surface is left untouched. |
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300 <TT |
| 0 | 301 CLASS="LITERAL" |
| 302 >SDL_SRCCOLORKEY</TT | |
| 303 > is ignored.</P | |
| 304 ></TD | |
| 305 ></TR | |
| 306 ><TR | |
| 307 ><TD | |
| 308 ALIGN="LEFT" | |
| 309 VALIGN="TOP" | |
| 310 >RGBA->RGBA without <TT | |
| 311 CLASS="LITERAL" | |
| 312 >SDL_SRCALPHA</TT | |
| 313 ></TD | |
| 314 ><TD | |
| 315 ALIGN="LEFT" | |
| 316 VALIGN="TOP" | |
| 317 ><P | |
| 318 >The RGBA data is copied to the destination surface. If <TT | |
| 319 CLASS="LITERAL" | |
| 320 >SDL_SRCCOLORKEY</TT | |
| 321 > is set, only the pixels not matching the colorkey value are copied.</P | |
| 322 ></TD | |
| 323 ></TR | |
| 324 ><TR | |
| 325 ><TD | |
| 326 ALIGN="LEFT" | |
| 327 VALIGN="TOP" | |
| 328 >RGB->RGB with <TT | |
| 329 CLASS="LITERAL" | |
| 330 >SDL_SRCALPHA</TT | |
| 331 ></TD | |
| 332 ><TD | |
| 333 ALIGN="LEFT" | |
| 334 VALIGN="TOP" | |
| 335 ><P | |
| 336 >The source is alpha-blended with the destination using the per-surface alpha value. If <TT | |
| 337 CLASS="LITERAL" | |
| 338 >SDL_SRCCOLORKEY</TT | |
| 339 > is set, only the pixels not matching the colorkey value are copied.</P | |
| 340 ></TD | |
| 341 ></TR | |
| 342 ><TR | |
| 343 ><TD | |
| 344 ALIGN="LEFT" | |
| 345 VALIGN="TOP" | |
| 346 >RGB->RGB without <TT | |
| 347 CLASS="LITERAL" | |
| 348 >SDL_SRCALPHA</TT | |
| 349 ></TD | |
| 350 ><TD | |
| 351 ALIGN="LEFT" | |
| 352 VALIGN="TOP" | |
| 353 ><P | |
| 354 >The RGB data is copied from the source. If <TT | |
| 355 CLASS="LITERAL" | |
| 356 >SDL_SRCCOLORKEY</TT | |
| 357 > is set, only the pixels not matching the colorkey value are copied.</P | |
| 358 ></TD | |
| 359 ></TR | |
| 360 ></TBODY | |
| 361 ></TABLE | |
| 362 ><P | |
| 363 ></P | |
| 364 ></DIV | |
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365 ><DIV |
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366 CLASS="NOTE" |
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367 ><BLOCKQUOTE |
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368 CLASS="NOTE" |
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369 ><P |
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370 ><B |
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371 >Note: </B |
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372 > Note that RGBA->RGBA blits (with SDL_SRCALPHA set) keep the alpha |
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373 of the destination surface. This means that you cannot compose two arbitrary |
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374 RGBA surfaces this way and get the result you would expect from "overlaying" |
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375 them; the destination alpha will work as a mask.</P |
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376 ><P |
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377 >Also note that per-pixel and per-surface alpha cannot be combined; |
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378 the per-pixel alpha is always used if available</P |
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379 ></BLOCKQUOTE |
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380 ></DIV |
| 0 | 381 ></DIV |
| 382 ><DIV | |
| 383 CLASS="REFSECT1" | |
| 384 ><A | |
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385 NAME="AEN2179" |
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386 ></A |
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387 ><H2 |
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388 >Return Value</H2 |
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389 ><P |
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390 >This function returns <SPAN |
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391 CLASS="RETURNVALUE" |
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392 >0</SPAN |
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393 >, or |
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394 <SPAN |
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395 CLASS="RETURNVALUE" |
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396 >-1</SPAN |
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397 > if there was an error.</P |
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398 ></DIV |
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399 ><DIV |
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400 CLASS="REFSECT1" |
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401 ><A |
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402 NAME="AEN2184" |
| 0 | 403 ></A |
| 404 ><H2 | |
| 405 >See Also</H2 | |
| 406 ><P | |
| 407 ><A | |
| 408 HREF="sdlmaprgba.html" | |
| 409 ><TT | |
| 410 CLASS="FUNCTION" | |
| 411 >SDL_MapRGBA</TT | |
| 412 ></A | |
| 413 >, | |
| 414 <A | |
| 415 HREF="sdlgetrgba.html" | |
| 416 ><TT | |
| 417 CLASS="FUNCTION" | |
| 418 >SDL_GetRGBA</TT | |
| 419 ></A | |
| 420 >, | |
| 421 <A | |
| 422 HREF="sdldisplayformatalpha.html" | |
| 423 ><TT | |
| 424 CLASS="FUNCTION" | |
| 425 >SDL_DisplayFormatAlpha</TT | |
| 426 ></A | |
| 427 >, | |
| 428 <A | |
| 429 HREF="sdlblitsurface.html" | |
| 430 ><TT | |
| 431 CLASS="FUNCTION" | |
| 432 >SDL_BlitSurface</TT | |
| 433 ></A | |
| 434 ></P | |
| 435 ></DIV | |
| 436 ><DIV | |
| 437 CLASS="NAVFOOTER" | |
| 438 ><HR | |
| 439 ALIGN="LEFT" | |
| 440 WIDTH="100%"><TABLE | |
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441 SUMMARY="Footer navigation table" |
| 0 | 442 WIDTH="100%" |
| 443 BORDER="0" | |
| 444 CELLPADDING="0" | |
| 445 CELLSPACING="0" | |
| 446 ><TR | |
| 447 ><TD | |
| 448 WIDTH="33%" | |
| 449 ALIGN="left" | |
| 450 VALIGN="top" | |
| 451 ><A | |
| 452 HREF="sdlsetcolorkey.html" | |
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453 ACCESSKEY="P" |
| 0 | 454 >Prev</A |
| 455 ></TD | |
| 456 ><TD | |
| 457 WIDTH="34%" | |
| 458 ALIGN="center" | |
| 459 VALIGN="top" | |
| 460 ><A | |
| 461 HREF="index.html" | |
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462 ACCESSKEY="H" |
| 0 | 463 >Home</A |
| 464 ></TD | |
| 465 ><TD | |
| 466 WIDTH="33%" | |
| 467 ALIGN="right" | |
| 468 VALIGN="top" | |
| 469 ><A | |
| 470 HREF="sdlsetcliprect.html" | |
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471 ACCESSKEY="N" |
| 0 | 472 >Next</A |
| 473 ></TD | |
| 474 ></TR | |
| 475 ><TR | |
| 476 ><TD | |
| 477 WIDTH="33%" | |
| 478 ALIGN="left" | |
| 479 VALIGN="top" | |
| 480 >SDL_SetColorKey</TD | |
| 481 ><TD | |
| 482 WIDTH="34%" | |
| 483 ALIGN="center" | |
| 484 VALIGN="top" | |
| 485 ><A | |
| 486 HREF="video.html" | |
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487 ACCESSKEY="U" |
| 0 | 488 >Up</A |
| 489 ></TD | |
| 490 ><TD | |
| 491 WIDTH="33%" | |
| 492 ALIGN="right" | |
| 493 VALIGN="top" | |
| 494 >SDL_SetClipRect</TD | |
| 495 ></TR | |
| 496 ></TABLE | |
| 497 ></DIV | |
| 498 ></BODY | |
| 499 ></HTML | |
| 500 > |