Mercurial > sdl-ios-xcode
annotate docs/html/sdldisplayformatalpha.html @ 2079:1ed2155b7ee4
From: Torsten Giebl
Subject: ALLOCA Patch for SDL-1.2
Newsgroups: gmane.comp.lib.sdl
Date: 2006-10-24 00:31:16 GMT
Hello !
As alloca.h is not available on CYGWIN and MinGW32
it should not be checked there or it should be checked
with -mno-cygwin using.
I am a total configure.in newbie, but i found the way
that things are handled in configure.in pretty bad for the
case CYGWIN with MinGW Mode or not.
Maybe this is not possible but i would like to
have a way to detect at the start for example CYGWIN
and then add. ask if configure was called with --enable-cygwin
for example. --enable-cygwin should be optional and disabled
by default as we want to have MinGW Mode by default.
Only if the user wants it he should be able to use it.
Then the whole configure.in would get add. questions
okay the system is CYGWIN with or without MinGW Mode.
The alloca.h thing for example is only
available under CYGWIN ( without MinGW Mode ).
CU
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Fri, 01 Dec 2006 20:25:03 +0000 |
| parents | 355632dca928 |
| children |
| rev | line source |
|---|---|
| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >SDL_DisplayFormatAlpha</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_DisplayFormat" | |
| 17 HREF="sdldisplayformat.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_WarpMouse" | |
| 20 HREF="sdlwarpmouse.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="sdldisplayformat.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="sdlwarpmouse.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="SDLDISPLAYFORMATALPHA" | |
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74 ></A |
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75 >SDL_DisplayFormatAlpha</H1 |
| 0 | 76 ><DIV |
| 77 CLASS="REFNAMEDIV" | |
| 78 ><A | |
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79 NAME="AEN2432" |
| 0 | 80 ></A |
| 81 ><H2 | |
| 82 >Name</H2 | |
| 83 >SDL_DisplayFormatAlpha -- Convert a surface to the display format</DIV | |
| 84 ><DIV | |
| 85 CLASS="REFSYNOPSISDIV" | |
| 86 ><A | |
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87 NAME="AEN2435" |
| 0 | 88 ></A |
| 89 ><H2 | |
| 90 >Synopsis</H2 | |
| 91 ><DIV | |
| 92 CLASS="FUNCSYNOPSIS" | |
| 93 ><A | |
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94 NAME="AEN2436" |
| 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 >SDL_Surface *<B | |
| 106 CLASS="FSFUNC" | |
| 107 >SDL_DisplayFormatAlpha</B | |
| 108 ></CODE | |
| 109 >(SDL_Surface *surface);</CODE | |
| 110 ></P | |
| 111 ><P | |
| 112 ></P | |
| 113 ></DIV | |
| 114 ></DIV | |
| 115 ><DIV | |
| 116 CLASS="REFSECT1" | |
| 117 ><A | |
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118 NAME="AEN2442" |
| 0 | 119 ></A |
| 120 ><H2 | |
| 121 >Description</H2 | |
| 122 ><P | |
| 123 >This function takes a surface and copies it to a new surface of the | |
| 124 pixel format and colors of the video framebuffer plus an alpha channel, | |
| 125 suitable for fast blitting onto the display surface. It calls | |
| 126 <A | |
| 127 HREF="sdlconvertsurface.html" | |
| 128 >SDL_ConvertSurface</A | |
| 129 ></P | |
| 130 ><P | |
| 131 >If you want to take advantage of hardware colorkey or alpha blit | |
| 132 acceleration, you should set the colorkey and alpha value before | |
| 133 calling this function.</P | |
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134 ><P |
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135 >This function can be used to convert a colourkey to an alpha channel, |
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136 if the <TT |
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137 CLASS="LITERAL" |
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138 >SDL_SRCCOLORKEY</TT |
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139 > flag is set on the surface. |
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140 The generated surface will then be transparent (alpha=0) where the |
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141 pixels match the colourkey, and opaque (alpha=255) elsewhere.</P |
| 0 | 142 ></DIV |
| 143 ><DIV | |
| 144 CLASS="REFSECT1" | |
| 145 ><A | |
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146 NAME="AEN2449" |
| 0 | 147 ></A |
| 148 ><H2 | |
| 149 >Return Value</H2 | |
| 150 ><P | |
| 151 >If the conversion fails or runs out of memory, it returns | |
| 152 <SPAN | |
| 153 CLASS="RETURNVALUE" | |
| 154 >NULL</SPAN | |
| 155 ></P | |
| 156 ></DIV | |
| 157 ><DIV | |
| 158 CLASS="REFSECT1" | |
| 159 ><A | |
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160 NAME="AEN2453" |
| 0 | 161 ></A |
| 162 ><H2 | |
| 163 >See Also</H2 | |
| 164 ><P | |
| 165 ><A | |
| 166 HREF="sdlconvertsurface.html" | |
| 167 >SDL_ConvertSurface</A | |
| 168 >, | |
| 169 <A | |
| 170 HREF="sdlsetalpha.html" | |
| 171 >SDL_SetAlpha</A | |
| 172 >, | |
| 173 <A | |
| 174 HREF="sdlsetcolorkey.html" | |
| 175 >SDL_SetColorKey</A | |
| 176 >, | |
| 177 <A | |
| 178 HREF="sdldisplayformat.html" | |
| 179 >SDL_DisplayFormat</A | |
| 180 >, | |
| 181 <A | |
| 182 HREF="sdlsurface.html" | |
| 183 >SDL_Surface</A | |
| 184 ></P | |
| 185 ></DIV | |
| 186 ><DIV | |
| 187 CLASS="NAVFOOTER" | |
| 188 ><HR | |
| 189 ALIGN="LEFT" | |
| 190 WIDTH="100%"><TABLE | |
|
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191 SUMMARY="Footer navigation table" |
| 0 | 192 WIDTH="100%" |
| 193 BORDER="0" | |
| 194 CELLPADDING="0" | |
| 195 CELLSPACING="0" | |
| 196 ><TR | |
| 197 ><TD | |
| 198 WIDTH="33%" | |
| 199 ALIGN="left" | |
| 200 VALIGN="top" | |
| 201 ><A | |
| 202 HREF="sdldisplayformat.html" | |
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203 ACCESSKEY="P" |
| 0 | 204 >Prev</A |
| 205 ></TD | |
| 206 ><TD | |
| 207 WIDTH="34%" | |
| 208 ALIGN="center" | |
| 209 VALIGN="top" | |
| 210 ><A | |
| 211 HREF="index.html" | |
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212 ACCESSKEY="H" |
| 0 | 213 >Home</A |
| 214 ></TD | |
| 215 ><TD | |
| 216 WIDTH="33%" | |
| 217 ALIGN="right" | |
| 218 VALIGN="top" | |
| 219 ><A | |
| 220 HREF="sdlwarpmouse.html" | |
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221 ACCESSKEY="N" |
| 0 | 222 >Next</A |
| 223 ></TD | |
| 224 ></TR | |
| 225 ><TR | |
| 226 ><TD | |
| 227 WIDTH="33%" | |
| 228 ALIGN="left" | |
| 229 VALIGN="top" | |
| 230 >SDL_DisplayFormat</TD | |
| 231 ><TD | |
| 232 WIDTH="34%" | |
| 233 ALIGN="center" | |
| 234 VALIGN="top" | |
| 235 ><A | |
| 236 HREF="video.html" | |
|
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237 ACCESSKEY="U" |
| 0 | 238 >Up</A |
| 239 ></TD | |
| 240 ><TD | |
| 241 WIDTH="33%" | |
| 242 ALIGN="right" | |
| 243 VALIGN="top" | |
| 244 >SDL_WarpMouse</TD | |
| 245 ></TR | |
| 246 ></TABLE | |
| 247 ></DIV | |
| 248 ></BODY | |
| 249 ></HTML | |
| 250 > |