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annotate docs/html/sdlgetrgba.html @ 553:417f8709e648
There's a bug in the VC7 optimizer relating to the duff loop optimization
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 02 Dec 2002 02:40:58 +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 > |