Mercurial > sdl-ios-xcode
annotate docs/html/sdldisplayformatalpha.html @ 302:8a86bdf34f0f
Added Atari joystick support (thanks Patrice!)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 07 Mar 2002 20:23:11 +0000 |
| parents | e5bc29de3f0a |
| children | 355632dca928 |
| 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 1.64 |
| 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_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 | |
| 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="sdldisplayformat.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="sdlwarpmouse.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="SDLDISPLAYFORMATALPHA" | |
| 71 >SDL_DisplayFormatAlpha</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
|
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76 NAME="AEN2048" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_DisplayFormatAlpha -- Convert a surface to the display format</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSYNOPSISDIV" | |
| 83 ><A | |
|
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84 NAME="AEN2051" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Synopsis</H2 | |
| 88 ><DIV | |
| 89 CLASS="FUNCSYNOPSIS" | |
| 90 ><A | |
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91 NAME="AEN2052" |
| 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_DisplayFormatAlpha</B | |
| 105 ></CODE | |
| 106 >(SDL_Surface *surface);</CODE | |
| 107 ></P | |
| 108 ><P | |
| 109 ></P | |
| 110 ></DIV | |
| 111 ></DIV | |
| 112 ><DIV | |
| 113 CLASS="REFSECT1" | |
| 114 ><A | |
|
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115 NAME="AEN2058" |
| 0 | 116 ></A |
| 117 ><H2 | |
| 118 >Description</H2 | |
| 119 ><P | |
| 120 >This function takes a surface and copies it to a new surface of the | |
| 121 pixel format and colors of the video framebuffer plus an alpha channel, | |
| 122 suitable for fast blitting onto the display surface. It calls | |
| 123 <A | |
| 124 HREF="sdlconvertsurface.html" | |
| 125 >SDL_ConvertSurface</A | |
| 126 ></P | |
| 127 ><P | |
| 128 >If you want to take advantage of hardware colorkey or alpha blit | |
| 129 acceleration, you should set the colorkey and alpha value before | |
| 130 calling this function.</P | |
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131 ><P |
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132 >This function can be used to convert a colourkey to an alpha channel, |
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133 if the <TT |
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134 CLASS="LITERAL" |
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135 >SDL_SRCCOLORKEY</TT |
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136 > flag is set on the surface. |
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137 The generated surface will then be transparent (alpha=0) where the |
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138 pixels match the colourkey, and opaque (alpha=255) elsewhere.</P |
| 0 | 139 ></DIV |
| 140 ><DIV | |
| 141 CLASS="REFSECT1" | |
| 142 ><A | |
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143 NAME="AEN2065" |
| 0 | 144 ></A |
| 145 ><H2 | |
| 146 >Return Value</H2 | |
| 147 ><P | |
| 148 >If the conversion fails or runs out of memory, it returns | |
| 149 <SPAN | |
| 150 CLASS="RETURNVALUE" | |
| 151 >NULL</SPAN | |
| 152 ></P | |
| 153 ></DIV | |
| 154 ><DIV | |
| 155 CLASS="REFSECT1" | |
| 156 ><A | |
|
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157 NAME="AEN2069" |
| 0 | 158 ></A |
| 159 ><H2 | |
| 160 >See Also</H2 | |
| 161 ><P | |
| 162 ><A | |
| 163 HREF="sdlconvertsurface.html" | |
| 164 >SDL_ConvertSurface</A | |
| 165 >, | |
| 166 <A | |
| 167 HREF="sdlsetalpha.html" | |
| 168 >SDL_SetAlpha</A | |
| 169 >, | |
| 170 <A | |
| 171 HREF="sdlsetcolorkey.html" | |
| 172 >SDL_SetColorKey</A | |
| 173 >, | |
| 174 <A | |
| 175 HREF="sdldisplayformat.html" | |
| 176 >SDL_DisplayFormat</A | |
| 177 >, | |
| 178 <A | |
| 179 HREF="sdlsurface.html" | |
| 180 >SDL_Surface</A | |
| 181 ></P | |
| 182 ></DIV | |
| 183 ><DIV | |
| 184 CLASS="NAVFOOTER" | |
| 185 ><HR | |
| 186 ALIGN="LEFT" | |
| 187 WIDTH="100%"><TABLE | |
| 188 WIDTH="100%" | |
| 189 BORDER="0" | |
| 190 CELLPADDING="0" | |
| 191 CELLSPACING="0" | |
| 192 ><TR | |
| 193 ><TD | |
| 194 WIDTH="33%" | |
| 195 ALIGN="left" | |
| 196 VALIGN="top" | |
| 197 ><A | |
| 198 HREF="sdldisplayformat.html" | |
| 199 >Prev</A | |
| 200 ></TD | |
| 201 ><TD | |
| 202 WIDTH="34%" | |
| 203 ALIGN="center" | |
| 204 VALIGN="top" | |
| 205 ><A | |
| 206 HREF="index.html" | |
| 207 >Home</A | |
| 208 ></TD | |
| 209 ><TD | |
| 210 WIDTH="33%" | |
| 211 ALIGN="right" | |
| 212 VALIGN="top" | |
| 213 ><A | |
| 214 HREF="sdlwarpmouse.html" | |
| 215 >Next</A | |
| 216 ></TD | |
| 217 ></TR | |
| 218 ><TR | |
| 219 ><TD | |
| 220 WIDTH="33%" | |
| 221 ALIGN="left" | |
| 222 VALIGN="top" | |
| 223 >SDL_DisplayFormat</TD | |
| 224 ><TD | |
| 225 WIDTH="34%" | |
| 226 ALIGN="center" | |
| 227 VALIGN="top" | |
| 228 ><A | |
| 229 HREF="video.html" | |
| 230 >Up</A | |
| 231 ></TD | |
| 232 ><TD | |
| 233 WIDTH="33%" | |
| 234 ALIGN="right" | |
| 235 VALIGN="top" | |
| 236 >SDL_WarpMouse</TD | |
| 237 ></TR | |
| 238 ></TABLE | |
| 239 ></DIV | |
| 240 ></BODY | |
| 241 ></HTML | |
| 242 > |