Mercurial > sdl-ios-xcode
annotate docs/html/sdldisplayformatalpha.html @ 610:95433459fbd2
Date: Mon, 14 Apr 2003 22:08:27 +0100
From: Patrice Mandin
Subject: [SDL][PATCH] 2 patches for sdl
Here are 2 patches for SDL:
- One is to put the dummy video drivers at the end of the
video drivers list. It gave me problems, when
SDL_VIDEODRIVER is not set, and the dummy driver is used
instead of the platform's driver, just because it is
always available. So the dummy driver must always be at
the end of the list. I suppose picogui and dc video
drivers also don't work.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 15 Apr 2003 15:46:56 +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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parents:
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137 The generated surface will then be transparent (alpha=0) where the |
|
55f1f1b3e27d
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parents:
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diff
changeset
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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 > |