Mercurial > sdl-ios-xcode
annotate docs/html/sdlblitsurface.html @ 3818:49eadd6e8962 SDL-ryan-multiple-audio-device
Mangled ALSA dynamic loading...static loading will still work if you have the
right libraries, but this is expected to break in general cases as we start
dealing with different symbol versions, etc (but may work with, say,
distro-specific packages, etc).
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Fri, 06 Oct 2006 19:45:11 +0000 |
| parents | 355632dca928 |
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| rev | line source |
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| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_BlitSurface</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_ConvertSurface" | |
| 17 HREF="sdlconvertsurface.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_FillRect" | |
| 20 HREF="sdlfillrect.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="sdlconvertsurface.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="sdlfillrect.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="SDLBLITSURFACE" | |
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74 ></A |
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75 >SDL_BlitSurface</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN2299" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_BlitSurface -- This performs a fast blit from the source surface to the destination surface.</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN2302" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN2303" |
| 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_BlitSurface</B | |
| 108 ></CODE | |
| 109 >(SDL_Surface *src, SDL_Rect *srcrect, SDL_Surface *dst, SDL_Rect *dstrect);</CODE | |
| 110 ></P | |
| 111 ><P | |
| 112 ></P | |
| 113 ></DIV | |
| 114 ></DIV | |
| 115 ><DIV | |
| 116 CLASS="REFSECT1" | |
| 117 ><A | |
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118 NAME="AEN2309" |
| 0 | 119 ></A |
| 120 ><H2 | |
| 121 >Description</H2 | |
| 122 ><P | |
| 123 >This performs a fast blit from the source surface to the destination surface.</P | |
| 124 ><P | |
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125 >The width and height in <TT |
| 0 | 126 CLASS="PARAMETER" |
| 127 ><I | |
| 128 >srcrect</I | |
| 129 ></TT | |
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130 > determine the |
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131 size of the copied rectangle. Only the position is used in the |
| 0 | 132 <TT |
| 133 CLASS="PARAMETER" | |
| 134 ><I | |
| 135 >dstrect</I | |
| 136 ></TT | |
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137 > (the width and height are ignored).</P |
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138 ><P |
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139 >If <TT |
| 0 | 140 CLASS="PARAMETER" |
| 141 ><I | |
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142 >srcrect</I |
| 0 | 143 ></TT |
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144 > is <TT |
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145 CLASS="LITERAL" |
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146 >NULL</TT |
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147 >, the |
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148 entire surface is copied. If <TT |
| 0 | 149 CLASS="PARAMETER" |
| 150 ><I | |
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151 >dstrect</I |
| 0 | 152 ></TT |
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153 > is |
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154 <TT |
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155 CLASS="LITERAL" |
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156 >NULL</TT |
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157 >, then the destination position (upper left |
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158 corner) is (0, 0).</P |
| 0 | 159 ><P |
| 160 >The final blit rectangle is saved in | |
| 161 <TT | |
| 162 CLASS="PARAMETER" | |
| 163 ><I | |
| 164 >dstrect</I | |
| 165 ></TT | |
| 166 > after all clipping is performed | |
| 167 (<TT | |
| 168 CLASS="PARAMETER" | |
| 169 ><I | |
| 170 >srcrect</I | |
| 171 ></TT | |
| 172 > is not modified).</P | |
| 173 ><P | |
| 174 >The blit function should not be called on a locked surface.</P | |
| 175 ><P | |
| 176 >The results of blitting operations vary greatly depending on whether <TT | |
| 177 CLASS="LITERAL" | |
| 178 >SDL_SRCAPLHA</TT | |
| 179 > is set or not. See <A | |
| 180 HREF="sdlsetalpha.html" | |
| 181 >SDL_SetAlpha</A | |
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182 > for an explaination of how this affects your results. Colorkeying and alpha attributes also interact with surface blitting, as the following pseudo-code should hopefully explain. |
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183 <PRE |
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184 CLASS="PROGRAMLISTING" |
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185 >if (source surface has SDL_SRCALPHA set) { |
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186 if (source surface has alpha channel (that is, format->Amask != 0)) |
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187 blit using per-pixel alpha, ignoring any colour key |
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188 else { |
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189 if (source surface has SDL_SRCCOLORKEY set) |
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190 blit using the colour key AND the per-surface alpha value |
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191 else |
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192 blit using the per-surface alpha value |
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193 } |
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194 } else { |
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195 if (source surface has SDL_SRCCOLORKEY set) |
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196 blit using the colour key |
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197 else |
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198 ordinary opaque rectangular blit |
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199 }</PRE |
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200 ></P |
| 0 | 201 ></DIV |
| 202 ><DIV | |
| 203 CLASS="REFSECT1" | |
| 204 ><A | |
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205 NAME="AEN2328" |
| 0 | 206 ></A |
| 207 ><H2 | |
| 208 >Return Value</H2 | |
| 209 ><P | |
| 210 >If the blit is successful, it returns <SPAN | |
| 211 CLASS="RETURNVALUE" | |
| 212 >0</SPAN | |
| 213 >, | |
| 214 otherwise it returns <SPAN | |
| 215 CLASS="RETURNVALUE" | |
| 216 >-1</SPAN | |
| 217 >.</P | |
| 218 ><P | |
| 219 >If either of the surfaces were in video memory, and the blit returns | |
| 220 <SPAN | |
| 221 CLASS="RETURNVALUE" | |
| 222 >-2</SPAN | |
| 223 >, the video memory was lost, so it should be | |
| 224 reloaded with artwork and re-blitted: | |
| 225 <PRE | |
| 226 CLASS="PROGRAMLISTING" | |
| 227 > while ( SDL_BlitSurface(image, imgrect, screen, dstrect) == -2 ) { | |
| 228 while ( SDL_LockSurface(image)) < 0 ) | |
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229 SDL_Delay(10); |
| 0 | 230 -- Write image pixels to image->pixels -- |
| 231 SDL_UnlockSurface(image); | |
| 232 }</PRE | |
| 233 > | |
| 234 This happens under DirectX 5.0 when the system switches away from your | |
| 235 fullscreen application. Locking the surface will also fail until you | |
| 236 have access to the video memory again.</P | |
| 237 ></DIV | |
| 238 ><DIV | |
| 239 CLASS="REFSECT1" | |
| 240 ><A | |
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241 NAME="AEN2336" |
| 0 | 242 ></A |
| 243 ><H2 | |
| 244 >See Also</H2 | |
| 245 ><P | |
| 246 ><A | |
| 247 HREF="sdllocksurface.html" | |
| 248 ><TT | |
| 249 CLASS="FUNCTION" | |
| 250 >SDL_LockSurface</TT | |
| 251 ></A | |
| 252 >, | |
| 253 <A | |
| 254 HREF="sdlfillrect.html" | |
| 255 ><TT | |
| 256 CLASS="FUNCTION" | |
| 257 >SDL_FillRect</TT | |
| 258 ></A | |
| 259 >, | |
| 260 <A | |
| 261 HREF="sdlsurface.html" | |
| 262 ><SPAN | |
| 263 CLASS="STRUCTNAME" | |
| 264 >SDL_Surface</SPAN | |
| 265 ></A | |
| 266 >, | |
| 267 <A | |
| 268 HREF="sdlrect.html" | |
| 269 ><SPAN | |
| 270 CLASS="STRUCTNAME" | |
| 271 >SDL_Rect</SPAN | |
| 272 ></A | |
| 273 ></P | |
| 274 ></DIV | |
| 275 ><DIV | |
| 276 CLASS="NAVFOOTER" | |
| 277 ><HR | |
| 278 ALIGN="LEFT" | |
| 279 WIDTH="100%"><TABLE | |
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280 SUMMARY="Footer navigation table" |
| 0 | 281 WIDTH="100%" |
| 282 BORDER="0" | |
| 283 CELLPADDING="0" | |
| 284 CELLSPACING="0" | |
| 285 ><TR | |
| 286 ><TD | |
| 287 WIDTH="33%" | |
| 288 ALIGN="left" | |
| 289 VALIGN="top" | |
| 290 ><A | |
| 291 HREF="sdlconvertsurface.html" | |
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292 ACCESSKEY="P" |
| 0 | 293 >Prev</A |
| 294 ></TD | |
| 295 ><TD | |
| 296 WIDTH="34%" | |
| 297 ALIGN="center" | |
| 298 VALIGN="top" | |
| 299 ><A | |
| 300 HREF="index.html" | |
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301 ACCESSKEY="H" |
| 0 | 302 >Home</A |
| 303 ></TD | |
| 304 ><TD | |
| 305 WIDTH="33%" | |
| 306 ALIGN="right" | |
| 307 VALIGN="top" | |
| 308 ><A | |
| 309 HREF="sdlfillrect.html" | |
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310 ACCESSKEY="N" |
| 0 | 311 >Next</A |
| 312 ></TD | |
| 313 ></TR | |
| 314 ><TR | |
| 315 ><TD | |
| 316 WIDTH="33%" | |
| 317 ALIGN="left" | |
| 318 VALIGN="top" | |
| 319 >SDL_ConvertSurface</TD | |
| 320 ><TD | |
| 321 WIDTH="34%" | |
| 322 ALIGN="center" | |
| 323 VALIGN="top" | |
| 324 ><A | |
| 325 HREF="video.html" | |
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326 ACCESSKEY="U" |
| 0 | 327 >Up</A |
| 328 ></TD | |
| 329 ><TD | |
| 330 WIDTH="33%" | |
| 331 ALIGN="right" | |
| 332 VALIGN="top" | |
| 333 >SDL_FillRect</TD | |
| 334 ></TR | |
| 335 ></TABLE | |
| 336 ></DIV | |
| 337 ></BODY | |
| 338 ></HTML | |
| 339 > |