Mercurial > sdl-ios-xcode
annotate docs/html/sdlblitsurface.html @ 2978:4c9130d66e2c
Added a few things to the TODO list.
Unit testing is becoming more and more important the more features are added
and the more combinations of factors there are to test.
| author | Sam Lantinga <slouken@libsdl.org> |
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| date | Sat, 03 Jan 2009 07:23:11 +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 > |