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annotate docs/html/sdlsetalpha.html @ 274:051b991765ba
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 13 Feb 2002 17:45:24 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| 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 1.64 |
| 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_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 | |
| 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="sdlsetcolorkey.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="sdlsetcliprect.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="SDLSETALPHA" | |
| 71 >SDL_SetAlpha</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
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76 NAME="AEN1712" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_SetAlpha -- Adjust the alpha properties of a surface</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSYNOPSISDIV" | |
| 83 ><A | |
|
181
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84 NAME="AEN1715" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Synopsis</H2 | |
| 88 ><DIV | |
| 89 CLASS="FUNCSYNOPSIS" | |
| 90 ><A | |
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91 NAME="AEN1716" |
| 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_SetAlpha</B | |
| 105 ></CODE | |
| 106 >(SDL_Surface *surface, Uint32 flag, Uint8 alpha);</CODE | |
| 107 ></P | |
| 108 ><P | |
| 109 ></P | |
| 110 ></DIV | |
| 111 ></DIV | |
| 112 ><DIV | |
| 113 CLASS="REFSECT1" | |
| 114 ><A | |
|
181
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115 NAME="AEN1722" |
| 0 | 116 ></A |
| 117 ><H2 | |
| 118 >Description</H2 | |
| 119 ><DIV | |
| 120 CLASS="NOTE" | |
| 121 ><BLOCKQUOTE | |
| 122 CLASS="NOTE" | |
| 123 ><P | |
| 124 ><B | |
| 125 >Note: </B | |
| 126 >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 | |
| 127 CLASS="LITERAL" | |
| 128 >SDL_ALPHA_TRANSPARENT</TT | |
| 129 >) is now considered transparent and 255 (<TT | |
| 130 CLASS="LITERAL" | |
| 131 >SDL_ALPHA_OPAQUE</TT | |
| 132 >) is now considered opaque.</P | |
| 133 ></BLOCKQUOTE | |
| 134 ></DIV | |
| 135 ><P | |
| 136 ><TT | |
| 137 CLASS="FUNCTION" | |
| 138 >SDL_SetAlpha</TT | |
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139 > is used for setting the per-surface alpha |
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140 value and/or enabling and disabling alpha blending.</P |
| 0 | 141 ><P |
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142 >The<TT |
| 0 | 143 CLASS="PARAMETER" |
| 144 ><I | |
| 145 >surface</I | |
| 146 ></TT | |
|
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147 > parameter specifies which surface whose alpha |
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148 attributes you wish to adjust. <TT |
| 0 | 149 CLASS="PARAMETER" |
| 150 ><I | |
| 151 >flags</I | |
| 152 ></TT | |
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153 > is used to specify |
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154 whether alpha blending should be used (<TT |
| 0 | 155 CLASS="LITERAL" |
| 156 >SDL_SRCALPHA</TT | |
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157 >) and |
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158 whether the surface should use RLE acceleration for blitting |
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159 (<TT |
| 0 | 160 CLASS="LITERAL" |
| 161 >SDL_RLEACCEL</TT | |
| 162 >). <TT | |
| 163 CLASS="PARAMETER" | |
| 164 ><I | |
| 165 >flags</I | |
| 166 ></TT | |
|
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167 > can be an OR'd |
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168 combination of these two options, one of these options or 0. If |
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169 <TT |
| 0 | 170 CLASS="LITERAL" |
| 171 >SDL_SRCALPHA</TT | |
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172 > is not passed as a flag then all alpha |
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173 information is ignored when blitting the surface. The |
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174 <TT |
| 0 | 175 CLASS="PARAMETER" |
| 176 ><I | |
| 177 >alpha</I | |
| 178 ></TT | |
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179 > parameter is the per-surface alpha value; a |
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180 surface need not have an alpha channel to use per-surface alpha and blitting |
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181 can still be accelerated with <TT |
| 0 | 182 CLASS="LITERAL" |
| 183 >SDL_RLEACCEL</TT | |
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184 >.</P |
| 0 | 185 ><DIV |
| 186 CLASS="NOTE" | |
| 187 ><BLOCKQUOTE | |
| 188 CLASS="NOTE" | |
| 189 ><P | |
| 190 ><B | |
| 191 >Note: </B | |
|
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192 >The per-surface alpha value of 128 is considered a special case and |
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193 is optimised, so it's much faster than other per-surface values.</P |
| 0 | 194 ></BLOCKQUOTE |
| 195 ></DIV | |
| 196 ><P | |
| 197 >Alpha effects surface blitting in the following ways:</P | |
| 198 ><DIV | |
| 199 CLASS="INFORMALTABLE" | |
| 200 ><A | |
|
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201 NAME="AEN1742" |
| 0 | 202 ></A |
| 203 ><P | |
| 204 ></P | |
| 205 ><TABLE | |
| 206 BORDER="0" | |
| 207 CLASS="CALSTABLE" | |
| 208 ><TBODY | |
| 209 ><TR | |
| 210 ><TD | |
| 211 ALIGN="LEFT" | |
| 212 VALIGN="TOP" | |
| 213 >RGBA->RGB with <TT | |
| 214 CLASS="LITERAL" | |
| 215 >SDL_SRCALPHA</TT | |
| 216 ></TD | |
| 217 ><TD | |
| 218 ALIGN="LEFT" | |
| 219 VALIGN="TOP" | |
| 220 ><P | |
| 221 >The source is alpha-blended with the destination, using the alpha channel. <TT | |
| 222 CLASS="LITERAL" | |
| 223 >SDL_SRCCOLORKEY</TT | |
| 224 > and the per-surface alpha are ignored.</P | |
| 225 ></TD | |
| 226 ></TR | |
| 227 ><TR | |
| 228 ><TD | |
| 229 ALIGN="LEFT" | |
| 230 VALIGN="TOP" | |
| 231 >RGBA->RGB without <TT | |
| 232 CLASS="LITERAL" | |
| 233 >SDL_SRCALPHA</TT | |
| 234 ></TD | |
| 235 ><TD | |
| 236 ALIGN="LEFT" | |
| 237 VALIGN="TOP" | |
| 238 ><P | |
| 239 >The RGB data is copied from the source. The source alpha channel and the per-surface alpha value are ignored.</P | |
| 240 ></TD | |
| 241 ></TR | |
| 242 ><TR | |
| 243 ><TD | |
| 244 ALIGN="LEFT" | |
| 245 VALIGN="TOP" | |
| 246 >RGB->RGBA with <TT | |
| 247 CLASS="LITERAL" | |
| 248 >SDL_SRCALPHA</TT | |
| 249 ></TD | |
| 250 ><TD | |
| 251 ALIGN="LEFT" | |
| 252 VALIGN="TOP" | |
| 253 ><P | |
|
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254 >The source is alpha-blended with the destination using the per-surface alpha |
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255 value. If <TT |
| 0 | 256 CLASS="LITERAL" |
| 257 >SDL_SRCCOLORKEY</TT | |
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258 > is set, only the pixels not |
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259 matching the colorkey value are copied. The alpha channel of the copied pixels |
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260 is set to opaque.</P |
| 0 | 261 ></TD |
| 262 ></TR | |
| 263 ><TR | |
| 264 ><TD | |
| 265 ALIGN="LEFT" | |
| 266 VALIGN="TOP" | |
| 267 >RGB->RGBA without <TT | |
| 268 CLASS="LITERAL" | |
| 269 >SDL_SRCALPHA</TT | |
| 270 ></TD | |
| 271 ><TD | |
| 272 ALIGN="LEFT" | |
| 273 VALIGN="TOP" | |
| 274 ><P | |
|
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275 >The RGB data is copied from the source and the alpha value of the copied pixels |
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276 is set to opaque. If <TT |
| 0 | 277 CLASS="LITERAL" |
| 278 >SDL_SRCCOLORKEY</TT | |
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279 > is set, only the pixels |
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280 not matching the colorkey value are copied. </P |
| 0 | 281 ></TD |
| 282 ></TR | |
| 283 ><TR | |
| 284 ><TD | |
| 285 ALIGN="LEFT" | |
| 286 VALIGN="TOP" | |
| 287 >RGBA->RGBA with <TT | |
| 288 CLASS="LITERAL" | |
| 289 >SDL_SRCALPHA</TT | |
| 290 ></TD | |
| 291 ><TD | |
| 292 ALIGN="LEFT" | |
| 293 VALIGN="TOP" | |
| 294 ><P | |
|
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295 >The source is alpha-blended with the destination using the source alpha |
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296 channel. The alpha channel in the destination surface is left untouched. |
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297 <TT |
| 0 | 298 CLASS="LITERAL" |
| 299 >SDL_SRCCOLORKEY</TT | |
| 300 > is ignored.</P | |
| 301 ></TD | |
| 302 ></TR | |
| 303 ><TR | |
| 304 ><TD | |
| 305 ALIGN="LEFT" | |
| 306 VALIGN="TOP" | |
| 307 >RGBA->RGBA without <TT | |
| 308 CLASS="LITERAL" | |
| 309 >SDL_SRCALPHA</TT | |
| 310 ></TD | |
| 311 ><TD | |
| 312 ALIGN="LEFT" | |
| 313 VALIGN="TOP" | |
| 314 ><P | |
| 315 >The RGBA data is copied to the destination surface. If <TT | |
| 316 CLASS="LITERAL" | |
| 317 >SDL_SRCCOLORKEY</TT | |
| 318 > is set, only the pixels not matching the colorkey value are copied.</P | |
| 319 ></TD | |
| 320 ></TR | |
| 321 ><TR | |
| 322 ><TD | |
| 323 ALIGN="LEFT" | |
| 324 VALIGN="TOP" | |
| 325 >RGB->RGB with <TT | |
| 326 CLASS="LITERAL" | |
| 327 >SDL_SRCALPHA</TT | |
| 328 ></TD | |
| 329 ><TD | |
| 330 ALIGN="LEFT" | |
| 331 VALIGN="TOP" | |
| 332 ><P | |
| 333 >The source is alpha-blended with the destination using the per-surface alpha value. If <TT | |
| 334 CLASS="LITERAL" | |
| 335 >SDL_SRCCOLORKEY</TT | |
| 336 > is set, only the pixels not matching the colorkey value are copied.</P | |
| 337 ></TD | |
| 338 ></TR | |
| 339 ><TR | |
| 340 ><TD | |
| 341 ALIGN="LEFT" | |
| 342 VALIGN="TOP" | |
| 343 >RGB->RGB without <TT | |
| 344 CLASS="LITERAL" | |
| 345 >SDL_SRCALPHA</TT | |
| 346 ></TD | |
| 347 ><TD | |
| 348 ALIGN="LEFT" | |
| 349 VALIGN="TOP" | |
| 350 ><P | |
| 351 >The RGB data is copied from the source. If <TT | |
| 352 CLASS="LITERAL" | |
| 353 >SDL_SRCCOLORKEY</TT | |
| 354 > is set, only the pixels not matching the colorkey value are copied.</P | |
| 355 ></TD | |
| 356 ></TR | |
| 357 ></TBODY | |
| 358 ></TABLE | |
| 359 ><P | |
| 360 ></P | |
| 361 ></DIV | |
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362 ><DIV |
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363 CLASS="NOTE" |
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364 ><BLOCKQUOTE |
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365 CLASS="NOTE" |
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366 ><P |
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367 ><B |
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368 >Note: </B |
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369 > Note that RGBA->RGBA blits (with SDL_SRCALPHA set) keep the alpha |
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370 of the destination surface. This means that you cannot compose two arbitrary |
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371 RGBA surfaces this way and get the result you would expect from "overlaying" |
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372 them; the destination alpha will work as a mask.</P |
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373 ><P |
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374 >Also note that per-pixel and per-surface alpha cannot be combined; |
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375 the per-pixel alpha is always used if available</P |
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376 ></BLOCKQUOTE |
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377 ></DIV |
| 0 | 378 ></DIV |
| 379 ><DIV | |
| 380 CLASS="REFSECT1" | |
| 381 ><A | |
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382 NAME="AEN1795" |
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383 ></A |
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384 ><H2 |
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385 >Return Value</H2 |
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386 ><P |
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387 >This function returns <SPAN |
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388 CLASS="RETURNVALUE" |
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389 >0</SPAN |
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390 >, or |
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391 <SPAN |
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392 CLASS="RETURNVALUE" |
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393 >-1</SPAN |
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394 > if there was an error.</P |
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395 ></DIV |
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396 ><DIV |
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397 CLASS="REFSECT1" |
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398 ><A |
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181
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399 NAME="AEN1800" |
| 0 | 400 ></A |
| 401 ><H2 | |
| 402 >See Also</H2 | |
| 403 ><P | |
| 404 ><A | |
| 405 HREF="sdlmaprgba.html" | |
| 406 ><TT | |
| 407 CLASS="FUNCTION" | |
| 408 >SDL_MapRGBA</TT | |
| 409 ></A | |
| 410 >, | |
| 411 <A | |
| 412 HREF="sdlgetrgba.html" | |
| 413 ><TT | |
| 414 CLASS="FUNCTION" | |
| 415 >SDL_GetRGBA</TT | |
| 416 ></A | |
| 417 >, | |
| 418 <A | |
| 419 HREF="sdldisplayformatalpha.html" | |
| 420 ><TT | |
| 421 CLASS="FUNCTION" | |
| 422 >SDL_DisplayFormatAlpha</TT | |
| 423 ></A | |
| 424 >, | |
| 425 <A | |
| 426 HREF="sdlblitsurface.html" | |
| 427 ><TT | |
| 428 CLASS="FUNCTION" | |
| 429 >SDL_BlitSurface</TT | |
| 430 ></A | |
| 431 ></P | |
| 432 ></DIV | |
| 433 ><DIV | |
| 434 CLASS="NAVFOOTER" | |
| 435 ><HR | |
| 436 ALIGN="LEFT" | |
| 437 WIDTH="100%"><TABLE | |
| 438 WIDTH="100%" | |
| 439 BORDER="0" | |
| 440 CELLPADDING="0" | |
| 441 CELLSPACING="0" | |
| 442 ><TR | |
| 443 ><TD | |
| 444 WIDTH="33%" | |
| 445 ALIGN="left" | |
| 446 VALIGN="top" | |
| 447 ><A | |
| 448 HREF="sdlsetcolorkey.html" | |
| 449 >Prev</A | |
| 450 ></TD | |
| 451 ><TD | |
| 452 WIDTH="34%" | |
| 453 ALIGN="center" | |
| 454 VALIGN="top" | |
| 455 ><A | |
| 456 HREF="index.html" | |
| 457 >Home</A | |
| 458 ></TD | |
| 459 ><TD | |
| 460 WIDTH="33%" | |
| 461 ALIGN="right" | |
| 462 VALIGN="top" | |
| 463 ><A | |
| 464 HREF="sdlsetcliprect.html" | |
| 465 >Next</A | |
| 466 ></TD | |
| 467 ></TR | |
| 468 ><TR | |
| 469 ><TD | |
| 470 WIDTH="33%" | |
| 471 ALIGN="left" | |
| 472 VALIGN="top" | |
| 473 >SDL_SetColorKey</TD | |
| 474 ><TD | |
| 475 WIDTH="34%" | |
| 476 ALIGN="center" | |
| 477 VALIGN="top" | |
| 478 ><A | |
| 479 HREF="video.html" | |
| 480 >Up</A | |
| 481 ></TD | |
| 482 ><TD | |
| 483 WIDTH="33%" | |
| 484 ALIGN="right" | |
| 485 VALIGN="top" | |
| 486 >SDL_SetClipRect</TD | |
| 487 ></TR | |
| 488 ></TABLE | |
| 489 ></DIV | |
| 490 ></BODY | |
| 491 ></HTML | |
| 492 > |