Mercurial > sdl-ios-xcode
annotate docs/html/sdlcreatergbsurface.html @ 310:c97c1d3b3b5c
Blit bug fix from John Popplewell
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 20 Mar 2002 02:21:46 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| rev | line source |
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| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_CreateRGBSurface</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_GetRGBA" | |
| 17 HREF="sdlgetrgba.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_CreateRGBSurfaceFrom" | |
| 20 HREF="sdlcreatergbsurfacefrom.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="sdlgetrgba.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="sdlcreatergbsurfacefrom.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="SDLCREATERGBSURFACE" | |
| 71 >SDL_CreateRGBSurface</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
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76 NAME="AEN1389" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_CreateRGBSurface -- Create an empty SDL_Surface</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSYNOPSISDIV" | |
| 83 ><A | |
|
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84 NAME="AEN1392" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Synopsis</H2 | |
| 88 ><DIV | |
| 89 CLASS="FUNCSYNOPSIS" | |
| 90 ><A | |
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91 NAME="AEN1393" |
| 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 >SDL_Surface *<B | |
| 103 CLASS="FSFUNC" | |
| 104 >SDL_CreateRGBSurface</B | |
| 105 ></CODE | |
| 106 >(Uint32 flags, int width, int height, int depth, Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask);</CODE | |
| 107 ></P | |
| 108 ><P | |
| 109 ></P | |
| 110 ></DIV | |
| 111 ></DIV | |
| 112 ><DIV | |
| 113 CLASS="REFSECT1" | |
| 114 ><A | |
|
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115 NAME="AEN1399" |
| 0 | 116 ></A |
| 117 ><H2 | |
| 118 >Description</H2 | |
| 119 ><P | |
| 120 >Allocate an empty surface (must be called after <A | |
| 121 HREF="sdlsetvideomode.html" | |
| 122 >SDL_SetVideoMode</A | |
| 123 >)</P | |
| 124 ><P | |
| 125 >If <TT | |
| 126 CLASS="PARAMETER" | |
| 127 ><I | |
| 128 >depth</I | |
| 129 ></TT | |
| 130 > is 8 bits an empty palette is allocated for the surface, otherwise a 'packed-pixel' <A | |
| 131 HREF="sdlpixelformat.html" | |
| 132 ><SPAN | |
| 133 CLASS="STRUCTNAME" | |
| 134 >SDL_PixelFormat</SPAN | |
| 135 ></A | |
| 136 > is created using the <TT | |
| 137 CLASS="PARAMETER" | |
| 138 ><I | |
| 139 >[RGBA]mask</I | |
| 140 ></TT | |
| 141 >'s provided (see <A | |
| 142 HREF="sdlpixelformat.html" | |
| 143 ><SPAN | |
| 144 CLASS="STRUCTNAME" | |
| 145 >SDL_PixelFormat</SPAN | |
| 146 ></A | |
| 147 >). The <TT | |
| 148 CLASS="PARAMETER" | |
| 149 ><I | |
| 150 >flags</I | |
| 151 ></TT | |
| 152 > specifies the type of surface that should be created, it is an OR'd combination of the following possible values.</P | |
| 153 ><DIV | |
| 154 CLASS="INFORMALTABLE" | |
| 155 ><A | |
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156 NAME="AEN1411" |
| 0 | 157 ></A |
| 158 ><P | |
| 159 ></P | |
| 160 ><TABLE | |
| 161 BORDER="1" | |
| 162 CLASS="CALSTABLE" | |
| 163 ><TBODY | |
| 164 ><TR | |
| 165 ><TD | |
| 166 ALIGN="LEFT" | |
| 167 VALIGN="TOP" | |
| 168 ><TT | |
| 169 CLASS="LITERAL" | |
| 170 >SDL_SWSURFACE</TT | |
| 171 ></TD | |
| 172 ><TD | |
| 173 ALIGN="LEFT" | |
| 174 VALIGN="TOP" | |
| 175 >SDL will create the surface in system memory. This improves the performance of pixel level access, however you may not be able to take advantage of some types of hardware blitting.</TD | |
| 176 ></TR | |
| 177 ><TR | |
| 178 ><TD | |
| 179 ALIGN="LEFT" | |
| 180 VALIGN="TOP" | |
| 181 ><TT | |
| 182 CLASS="LITERAL" | |
| 183 >SDL_HWSURFACE</TT | |
| 184 ></TD | |
| 185 ><TD | |
| 186 ALIGN="LEFT" | |
| 187 VALIGN="TOP" | |
| 188 >SDL will attempt to create the surface in video memory. This will allow SDL to take advantage of Video->Video blits (which are often accelerated).</TD | |
| 189 ></TR | |
| 190 ><TR | |
| 191 ><TD | |
| 192 ALIGN="LEFT" | |
| 193 VALIGN="TOP" | |
| 194 ><TT | |
| 195 CLASS="LITERAL" | |
| 196 >SDL_SRCCOLORKEY</TT | |
| 197 ></TD | |
| 198 ><TD | |
| 199 ALIGN="LEFT" | |
| 200 VALIGN="TOP" | |
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201 >This flag turns on colourkeying for blits from this surface. If |
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202 <TT |
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203 CLASS="LITERAL" |
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204 >SDL_HWSURFACE</TT |
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205 > is also specified and colourkeyed blits |
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206 are hardware-accelerated, then SDL will attempt to place the surface in |
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207 video memory. |
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208 Use <A |
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209 HREF="sdlsetcolorkey.html" |
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210 ><TT |
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211 CLASS="FUNCTION" |
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212 >SDL_SetColorKey</TT |
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213 ></A |
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214 > |
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215 to set or clear this flag after surface creation.</TD |
| 0 | 216 ></TR |
| 217 ><TR | |
| 218 ><TD | |
| 219 ALIGN="LEFT" | |
| 220 VALIGN="TOP" | |
| 221 ><TT | |
| 222 CLASS="LITERAL" | |
| 223 >SDL_SRCALPHA</TT | |
| 224 ></TD | |
| 225 ><TD | |
| 226 ALIGN="LEFT" | |
| 227 VALIGN="TOP" | |
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228 >This flag turns on alpha-blending for blits from this surface. If |
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229 <TT |
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230 CLASS="LITERAL" |
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231 >SDL_HWSURFACE</TT |
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232 > is also specified and alpha-blending blits |
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233 are hardware-accelerated, then the surface will be placed in video memory if |
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234 possible. |
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235 Use <A |
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236 HREF="sdlsetalpha.html" |
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237 ><TT |
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238 CLASS="FUNCTION" |
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239 >SDL_SetAlpha</TT |
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240 ></A |
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241 > to |
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242 set or clear this flag after surface creation.</TD |
| 0 | 243 ></TR |
| 244 ></TBODY | |
| 245 ></TABLE | |
| 246 ><P | |
| 247 ></P | |
| 248 ></DIV | |
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249 ><DIV |
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250 CLASS="NOTE" |
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251 ><BLOCKQUOTE |
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252 CLASS="NOTE" |
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253 ><P |
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254 ><B |
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255 >Note: </B |
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256 >If an alpha-channel is specified (that is, if <TT |
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257 CLASS="PARAMETER" |
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258 ><I |
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259 >Amask</I |
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260 ></TT |
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261 > is |
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262 nonzero), then the <TT |
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263 CLASS="LITERAL" |
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264 >SDL_SRCALPHA</TT |
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265 > flag is automatically |
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266 set. You may remove this flag by calling |
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267 <A |
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268 HREF="sdlsetalpha.html" |
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269 ><TT |
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270 CLASS="FUNCTION" |
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271 >SDL_SetAlpha</TT |
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272 ></A |
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273 > |
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274 after surface creation.</P |
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275 ></BLOCKQUOTE |
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276 ></DIV |
| 0 | 277 ></DIV |
| 278 ><DIV | |
| 279 CLASS="REFSECT1" | |
| 280 ><A | |
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281 NAME="AEN1442" |
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282 ></A |
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283 ><H2 |
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284 >Return Value</H2 |
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285 ><P |
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286 >Returns the created surface, or <SPAN |
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287 CLASS="RETURNVALUE" |
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288 >NULL</SPAN |
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289 > upon error.</P |
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290 ></DIV |
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291 ><DIV |
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292 CLASS="REFSECT1" |
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293 ><A |
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294 NAME="AEN1446" |
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295 ></A |
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296 ><H2 |
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297 >Example</H2 |
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298 ><PRE |
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299 CLASS="PROGRAMLISTING" |
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300 > /* Create a 32-bit surface with the bytes of each pixel in R,G,B,A order, |
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301 as expected by OpenGL for textures */ |
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302 SDL_Surface *surface; |
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303 Uint32 rmask, gmask, bmask, amask; |
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304 |
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305 /* SDL interprets each pixel as a 32-bit number, so our masks must depend |
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306 on the endianness (byte order) of the machine */ |
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307 #if SDL_BYTEORDER == SDL_BIG_ENDIAN |
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308 rmask = 0xff000000; |
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309 gmask = 0x00ff0000; |
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310 bmask = 0x0000ff00; |
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311 amask = 0x000000ff; |
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312 #else |
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313 rmask = 0x000000ff; |
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314 gmask = 0x0000ff00; |
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315 bmask = 0x00ff0000; |
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316 amask = 0xff000000; |
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317 #endif |
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318 |
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319 surface = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, 32, |
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320 rmask, gmask, bmask, amask); |
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321 if(surface == NULL) { |
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322 fprintf(stderr, "CreateRGBSurface failed: %s\n", SDL_GetError()); |
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323 exit(1); |
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324 }</PRE |
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325 ></DIV |
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326 ><DIV |
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327 CLASS="REFSECT1" |
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328 ><A |
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329 NAME="AEN1449" |
| 0 | 330 ></A |
| 331 ><H2 | |
| 332 >See Also</H2 | |
| 333 ><P | |
| 334 ><A | |
| 335 HREF="sdlcreatergbsurfacefrom.html" | |
| 336 ><TT | |
| 337 CLASS="FUNCTION" | |
| 338 >SDL_CreateRGBSurfaceFrom</TT | |
| 339 ></A | |
| 340 >, | |
| 341 <A | |
| 342 HREF="sdlfreesurface.html" | |
| 343 ><TT | |
| 344 CLASS="FUNCTION" | |
| 345 >SDL_FreeSurface</TT | |
| 346 ></A | |
| 347 >, | |
| 348 <A | |
| 349 HREF="sdlsetvideomode.html" | |
| 350 ><TT | |
| 351 CLASS="FUNCTION" | |
| 352 >SDL_SetVideoMode</TT | |
| 353 ></A | |
| 354 >, | |
| 355 <A | |
| 356 HREF="sdllocksurface.html" | |
| 357 ><TT | |
| 358 CLASS="FUNCTION" | |
| 359 >SDL_LockSurface</TT | |
| 360 ></A | |
| 361 >, | |
| 362 <A | |
| 363 HREF="sdlpixelformat.html" | |
| 364 ><SPAN | |
| 365 CLASS="STRUCTNAME" | |
| 366 >SDL_PixelFormat</SPAN | |
| 367 ></A | |
| 368 >, | |
| 369 <A | |
| 370 HREF="sdlsurface.html" | |
| 371 ><SPAN | |
| 372 CLASS="STRUCTNAME" | |
| 373 >SDL_Surface</SPAN | |
| 374 ></A | |
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375 > |
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376 <A |
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377 HREF="sdlsetalpha.html" |
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378 ><TT |
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379 CLASS="FUNCTION" |
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380 >SDL_SetAlpha</TT |
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381 ></A |
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382 > |
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383 <A |
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384 HREF="sdlsetcolorkey.html" |
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385 ><TT |
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386 CLASS="FUNCTION" |
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387 >SDL_SetColorKey</TT |
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388 ></A |
| 0 | 389 ></P |
| 390 ></DIV | |
| 391 ><DIV | |
| 392 CLASS="NAVFOOTER" | |
| 393 ><HR | |
| 394 ALIGN="LEFT" | |
| 395 WIDTH="100%"><TABLE | |
| 396 WIDTH="100%" | |
| 397 BORDER="0" | |
| 398 CELLPADDING="0" | |
| 399 CELLSPACING="0" | |
| 400 ><TR | |
| 401 ><TD | |
| 402 WIDTH="33%" | |
| 403 ALIGN="left" | |
| 404 VALIGN="top" | |
| 405 ><A | |
| 406 HREF="sdlgetrgba.html" | |
| 407 >Prev</A | |
| 408 ></TD | |
| 409 ><TD | |
| 410 WIDTH="34%" | |
| 411 ALIGN="center" | |
| 412 VALIGN="top" | |
| 413 ><A | |
| 414 HREF="index.html" | |
| 415 >Home</A | |
| 416 ></TD | |
| 417 ><TD | |
| 418 WIDTH="33%" | |
| 419 ALIGN="right" | |
| 420 VALIGN="top" | |
| 421 ><A | |
| 422 HREF="sdlcreatergbsurfacefrom.html" | |
| 423 >Next</A | |
| 424 ></TD | |
| 425 ></TR | |
| 426 ><TR | |
| 427 ><TD | |
| 428 WIDTH="33%" | |
| 429 ALIGN="left" | |
| 430 VALIGN="top" | |
| 431 >SDL_GetRGBA</TD | |
| 432 ><TD | |
| 433 WIDTH="34%" | |
| 434 ALIGN="center" | |
| 435 VALIGN="top" | |
| 436 ><A | |
| 437 HREF="video.html" | |
| 438 >Up</A | |
| 439 ></TD | |
| 440 ><TD | |
| 441 WIDTH="33%" | |
| 442 ALIGN="right" | |
| 443 VALIGN="top" | |
| 444 >SDL_CreateRGBSurfaceFrom</TD | |
| 445 ></TR | |
| 446 ></TABLE | |
| 447 ></DIV | |
| 448 ></BODY | |
| 449 ></HTML | |
| 450 > |