Mercurial > sdl-ios-xcode
annotate docs/html/sdlgetrgba.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_GetRGBA</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_GetRGB" | |
| 17 HREF="sdlgetrgb.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_CreateRGBSurface" | |
| 20 HREF="sdlcreatergbsurface.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="sdlgetrgb.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="sdlcreatergbsurface.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="SDLGETRGBA" | |
| 71 >SDL_GetRGBA</A | |
| 72 ></H1 | |
| 73 ><DIV | |
| 74 CLASS="REFNAMEDIV" | |
| 75 ><A | |
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76 NAME="AEN1363" |
| 0 | 77 ></A |
| 78 ><H2 | |
| 79 >Name</H2 | |
| 80 >SDL_GetRGBA -- Get RGBA values from a pixel in the specified pixel format.</DIV | |
| 81 ><DIV | |
| 82 CLASS="REFSYNOPSISDIV" | |
| 83 ><A | |
|
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84 NAME="AEN1366" |
| 0 | 85 ></A |
| 86 ><H2 | |
| 87 >Synopsis</H2 | |
| 88 ><DIV | |
| 89 CLASS="FUNCSYNOPSIS" | |
| 90 ><A | |
|
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91 NAME="AEN1367" |
| 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 >void <B | |
| 103 CLASS="FSFUNC" | |
| 104 >SDL_GetRGBA</B | |
| 105 ></CODE | |
| 106 >(Uint32 pixel, SDL_PixelFormat *fmt, Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a);</CODE | |
| 107 ></P | |
| 108 ><P | |
| 109 ></P | |
| 110 ></DIV | |
| 111 ></DIV | |
| 112 ><DIV | |
| 113 CLASS="REFSECT1" | |
| 114 ><A | |
|
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115 NAME="AEN1373" |
| 0 | 116 ></A |
| 117 ><H2 | |
| 118 >Description</H2 | |
| 119 ><P | |
| 120 >Get RGBA component values from a pixel stored in the specified pixel format.</P | |
| 121 ><P | |
| 122 >This function uses the entire 8-bit [0..255] range when converting color | |
| 123 components from pixel formats with less than 8-bits per RGB component | |
| 124 (e.g., a completely white pixel in 16-bit RGB565 format would return | |
| 125 [0xff, 0xff, 0xff] not [0xf8, 0xfc, 0xf8]).</P | |
| 126 ><P | |
| 127 >If the surface has no alpha component, the alpha will be returned as 0xff | |
| 128 (100% opaque).</P | |
| 129 ></DIV | |
| 130 ><DIV | |
| 131 CLASS="REFSECT1" | |
| 132 ><A | |
|
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133 NAME="AEN1378" |
| 0 | 134 ></A |
| 135 ><H2 | |
| 136 >See Also</H2 | |
| 137 ><P | |
| 138 ><A | |
| 139 HREF="sdlgetrgb.html" | |
| 140 >SDL_GetRGB</A | |
| 141 >, | |
| 142 <A | |
| 143 HREF="sdlmaprgb.html" | |
| 144 >SDL_MapRGB</A | |
| 145 >, | |
| 146 <A | |
| 147 HREF="sdlmaprgba.html" | |
| 148 >SDL_MapRGBA</A | |
| 149 >, | |
| 150 <A | |
| 151 HREF="sdlpixelformat.html" | |
| 152 >SDL_PixelFormat</A | |
| 153 ></P | |
| 154 ></DIV | |
| 155 ><DIV | |
| 156 CLASS="NAVFOOTER" | |
| 157 ><HR | |
| 158 ALIGN="LEFT" | |
| 159 WIDTH="100%"><TABLE | |
| 160 WIDTH="100%" | |
| 161 BORDER="0" | |
| 162 CELLPADDING="0" | |
| 163 CELLSPACING="0" | |
| 164 ><TR | |
| 165 ><TD | |
| 166 WIDTH="33%" | |
| 167 ALIGN="left" | |
| 168 VALIGN="top" | |
| 169 ><A | |
| 170 HREF="sdlgetrgb.html" | |
| 171 >Prev</A | |
| 172 ></TD | |
| 173 ><TD | |
| 174 WIDTH="34%" | |
| 175 ALIGN="center" | |
| 176 VALIGN="top" | |
| 177 ><A | |
| 178 HREF="index.html" | |
| 179 >Home</A | |
| 180 ></TD | |
| 181 ><TD | |
| 182 WIDTH="33%" | |
| 183 ALIGN="right" | |
| 184 VALIGN="top" | |
| 185 ><A | |
| 186 HREF="sdlcreatergbsurface.html" | |
| 187 >Next</A | |
| 188 ></TD | |
| 189 ></TR | |
| 190 ><TR | |
| 191 ><TD | |
| 192 WIDTH="33%" | |
| 193 ALIGN="left" | |
| 194 VALIGN="top" | |
| 195 >SDL_GetRGB</TD | |
| 196 ><TD | |
| 197 WIDTH="34%" | |
| 198 ALIGN="center" | |
| 199 VALIGN="top" | |
| 200 ><A | |
| 201 HREF="video.html" | |
| 202 >Up</A | |
| 203 ></TD | |
| 204 ><TD | |
| 205 WIDTH="33%" | |
| 206 ALIGN="right" | |
| 207 VALIGN="top" | |
| 208 >SDL_CreateRGBSurface</TD | |
| 209 ></TR | |
| 210 ></TABLE | |
| 211 ></DIV | |
| 212 ></BODY | |
| 213 ></HTML | |
| 214 > |