Mercurial > sdl-ios-xcode
annotate docs/html/sdloverlay.html @ 1555:780fd5b61df1
Fixed bug #89
Date: Sun, 23 Oct 2005 16:39:03 +0200
From: "A. Schmid" <sahib@phreaker.net>
Subject: [SDL] no software surfaces with svgalib driver?
Hi,
I noticed that the SDL (1.2.9) svgalib driver only makes use of linear
addressable (framebuffer) video modes. On older systems (like one of
mine), linear addressable modes are often not available.
Especially for cards with VESA VBE < 2.0 the svgalib vesa driver is
unusable, since VESA only supports framebuffering for VBE 2.0 and later.
The changes necessary to add support for software surfaces seem to be
relatively small. I only had to hack src/video/svga/SDL_svgavideo.c (see
attached patch). The code worked fine for me, but it is no more than a
proof of concept and should be reviewed (probably has a memory leak when
switching modes). It also uses the vgagl library (included in the
svgalib package) and needs to be linked against it.
-Alex
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 19 Mar 2006 12:05:16 +0000 |
| parents | 355632dca928 |
| children |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_Overlay</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_VideoInfo" | |
| 17 HREF="sdlvideoinfo.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="Window Management" | |
| 20 HREF="wm.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="sdlvideoinfo.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="wm.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="SDLOVERLAY" | |
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74 ></A |
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75 >SDL_Overlay</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN3464" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_Overlay -- YUV video overlay</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSECT1" | |
| 86 ><A | |
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87 NAME="AEN3467" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Structure Definition</H2 | |
| 91 ><PRE | |
| 92 CLASS="PROGRAMLISTING" | |
| 93 >typedef struct{ | |
| 94 Uint32 format; | |
| 95 int w, h; | |
| 96 int planes; | |
| 97 Uint16 *pitches; | |
| 98 Uint8 **pixels; | |
| 99 Uint32 hw_overlay:1; | |
| 100 } SDL_Overlay;</PRE | |
| 101 ></DIV | |
| 102 ><DIV | |
| 103 CLASS="REFSECT1" | |
| 104 ><A | |
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105 NAME="AEN3470" |
| 0 | 106 ></A |
| 107 ><H2 | |
| 108 >Structure Data</H2 | |
| 109 ><DIV | |
| 110 CLASS="INFORMALTABLE" | |
| 111 ><A | |
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112 NAME="AEN3472" |
| 0 | 113 ></A |
| 114 ><P | |
| 115 ></P | |
| 116 ><TABLE | |
| 117 BORDER="0" | |
| 118 CLASS="CALSTABLE" | |
| 119 ><TBODY | |
| 120 ><TR | |
| 121 ><TD | |
| 122 ALIGN="LEFT" | |
| 123 VALIGN="TOP" | |
| 124 ><TT | |
| 125 CLASS="STRUCTFIELD" | |
| 126 ><I | |
| 127 >format</I | |
| 128 ></TT | |
| 129 ></TD | |
| 130 ><TD | |
| 131 ALIGN="LEFT" | |
| 132 VALIGN="TOP" | |
| 133 >Overlay format (see below)</TD | |
| 134 ></TR | |
| 135 ><TR | |
| 136 ><TD | |
| 137 ALIGN="LEFT" | |
| 138 VALIGN="TOP" | |
| 139 ><TT | |
| 140 CLASS="STRUCTFIELD" | |
| 141 ><I | |
| 142 >w, h</I | |
| 143 ></TT | |
| 144 ></TD | |
| 145 ><TD | |
| 146 ALIGN="LEFT" | |
| 147 VALIGN="TOP" | |
| 148 >Width and height of overlay</TD | |
| 149 ></TR | |
| 150 ><TR | |
| 151 ><TD | |
| 152 ALIGN="LEFT" | |
| 153 VALIGN="TOP" | |
| 154 ><TT | |
| 155 CLASS="STRUCTFIELD" | |
| 156 ><I | |
| 157 >planes</I | |
| 158 ></TT | |
| 159 ></TD | |
| 160 ><TD | |
| 161 ALIGN="LEFT" | |
| 162 VALIGN="TOP" | |
| 163 >Number of planes in the overlay. Usually either 1 or 3</TD | |
| 164 ></TR | |
| 165 ><TR | |
| 166 ><TD | |
| 167 ALIGN="LEFT" | |
| 168 VALIGN="TOP" | |
| 169 ><TT | |
| 170 CLASS="STRUCTFIELD" | |
| 171 ><I | |
| 172 >pitches</I | |
| 173 ></TT | |
| 174 ></TD | |
| 175 ><TD | |
| 176 ALIGN="LEFT" | |
| 177 VALIGN="TOP" | |
| 178 >An array of pitches, one for each plane. Pitch is the length of a row in bytes.</TD | |
| 179 ></TR | |
| 180 ><TR | |
| 181 ><TD | |
| 182 ALIGN="LEFT" | |
| 183 VALIGN="TOP" | |
| 184 ><TT | |
| 185 CLASS="STRUCTFIELD" | |
| 186 ><I | |
| 187 >pixels</I | |
| 188 ></TT | |
| 189 ></TD | |
| 190 ><TD | |
| 191 ALIGN="LEFT" | |
| 192 VALIGN="TOP" | |
| 193 >An array of pointers to teh data of each plane. The overlay should be locked before these pointers are used.</TD | |
| 194 ></TR | |
| 195 ><TR | |
| 196 ><TD | |
| 197 ALIGN="LEFT" | |
| 198 VALIGN="TOP" | |
| 199 ><TT | |
| 200 CLASS="STRUCTFIELD" | |
| 201 ><I | |
| 202 >hw_overlay</I | |
| 203 ></TT | |
| 204 ></TD | |
| 205 ><TD | |
| 206 ALIGN="LEFT" | |
| 207 VALIGN="TOP" | |
| 208 >This will be set to 1 if the overlay is hardware accelerated.</TD | |
| 209 ></TR | |
| 210 ></TBODY | |
| 211 ></TABLE | |
| 212 ><P | |
| 213 ></P | |
| 214 ></DIV | |
| 215 ></DIV | |
| 216 ><DIV | |
| 217 CLASS="REFSECT1" | |
| 218 ><A | |
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parents:
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219 NAME="AEN3499" |
| 0 | 220 ></A |
| 221 ><H2 | |
| 222 >Description</H2 | |
| 223 ><P | |
| 224 >A <SPAN | |
| 225 CLASS="STRUCTNAME" | |
| 226 >SDL_Overlay</SPAN | |
| 227 > is similar to a <A | |
| 228 HREF="sdlsurface.html" | |
| 229 ><SPAN | |
| 230 CLASS="STRUCTNAME" | |
| 231 >SDL_Surface</SPAN | |
| 232 ></A | |
| 233 > except it stores a YUV overlay. All the fields are read only, except for <TT | |
| 234 CLASS="STRUCTFIELD" | |
| 235 ><I | |
| 236 >pixels</I | |
| 237 ></TT | |
| 238 > which should be <A | |
| 239 HREF="sdllockyuvoverlay.html" | |
| 240 >locked</A | |
| 241 > before use. The <TT | |
| 242 CLASS="STRUCTFIELD" | |
| 243 ><I | |
| 244 >format</I | |
| 245 ></TT | |
| 246 > field stores the format of the overlay which is one of the following: | |
| 247 <PRE | |
| 248 CLASS="PROGRAMLISTING" | |
| 249 >#define SDL_YV12_OVERLAY 0x32315659 /* Planar mode: Y + V + U */ | |
| 250 #define SDL_IYUV_OVERLAY 0x56555949 /* Planar mode: Y + U + V */ | |
| 251 #define SDL_YUY2_OVERLAY 0x32595559 /* Packed mode: Y0+U0+Y1+V0 */ | |
| 252 #define SDL_UYVY_OVERLAY 0x59565955 /* Packed mode: U0+Y0+V0+Y1 */ | |
| 253 #define SDL_YVYU_OVERLAY 0x55595659 /* Packed mode: Y0+V0+Y1+U0 */</PRE | |
| 254 > | |
| 255 More information on YUV formats can be found at <A | |
| 256 HREF="http://www.webartz.com/fourcc/indexyuv.htm" | |
| 257 TARGET="_top" | |
| 258 >http://www.webartz.com/fourcc/indexyuv.htm</A | |
| 259 >.</P | |
| 260 ></DIV | |
| 261 ><DIV | |
| 262 CLASS="REFSECT1" | |
| 263 ><A | |
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264 NAME="AEN3510" |
| 0 | 265 ></A |
| 266 ><H2 | |
| 267 >See Also</H2 | |
| 268 ><P | |
| 269 ><A | |
| 270 HREF="sdlcreateyuvoverlay.html" | |
| 271 ><TT | |
| 272 CLASS="FUNCTION" | |
| 273 >SDL_CreateYUVOverlay</TT | |
| 274 ></A | |
| 275 >, | |
| 276 <A | |
| 277 HREF="sdllockyuvoverlay.html" | |
| 278 ><TT | |
| 279 CLASS="FUNCTION" | |
| 280 >SDL_LockYUVOverlay</TT | |
| 281 ></A | |
| 282 >, | |
| 283 <A | |
| 284 HREF="sdlunlockyuvoverlay.html" | |
| 285 ><TT | |
| 286 CLASS="FUNCTION" | |
| 287 >SDL_UnlockYUVOverlay</TT | |
| 288 ></A | |
| 289 >, | |
| 290 <A | |
| 291 HREF="sdlfreeyuvoverlay.html" | |
| 292 ><TT | |
| 293 CLASS="FUNCTION" | |
| 294 >SDL_FreeYUVOverlay</TT | |
| 295 ></A | |
| 296 ></P | |
| 297 ></DIV | |
| 298 ><DIV | |
| 299 CLASS="NAVFOOTER" | |
| 300 ><HR | |
| 301 ALIGN="LEFT" | |
| 302 WIDTH="100%"><TABLE | |
|
803
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parents:
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303 SUMMARY="Footer navigation table" |
| 0 | 304 WIDTH="100%" |
| 305 BORDER="0" | |
| 306 CELLPADDING="0" | |
| 307 CELLSPACING="0" | |
| 308 ><TR | |
| 309 ><TD | |
| 310 WIDTH="33%" | |
| 311 ALIGN="left" | |
| 312 VALIGN="top" | |
| 313 ><A | |
| 314 HREF="sdlvideoinfo.html" | |
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parents:
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315 ACCESSKEY="P" |
| 0 | 316 >Prev</A |
| 317 ></TD | |
| 318 ><TD | |
| 319 WIDTH="34%" | |
| 320 ALIGN="center" | |
| 321 VALIGN="top" | |
| 322 ><A | |
| 323 HREF="index.html" | |
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324 ACCESSKEY="H" |
| 0 | 325 >Home</A |
| 326 ></TD | |
| 327 ><TD | |
| 328 WIDTH="33%" | |
| 329 ALIGN="right" | |
| 330 VALIGN="top" | |
| 331 ><A | |
| 332 HREF="wm.html" | |
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parents:
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333 ACCESSKEY="N" |
| 0 | 334 >Next</A |
| 335 ></TD | |
| 336 ></TR | |
| 337 ><TR | |
| 338 ><TD | |
| 339 WIDTH="33%" | |
| 340 ALIGN="left" | |
| 341 VALIGN="top" | |
| 342 >SDL_VideoInfo</TD | |
| 343 ><TD | |
| 344 WIDTH="34%" | |
| 345 ALIGN="center" | |
| 346 VALIGN="top" | |
| 347 ><A | |
| 348 HREF="video.html" | |
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803
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349 ACCESSKEY="U" |
| 0 | 350 >Up</A |
| 351 ></TD | |
| 352 ><TD | |
| 353 WIDTH="33%" | |
| 354 ALIGN="right" | |
| 355 VALIGN="top" | |
| 356 >Window Management</TD | |
| 357 ></TR | |
| 358 ></TABLE | |
| 359 ></DIV | |
| 360 ></BODY | |
| 361 ></HTML | |
| 362 > |