1 <HTML 2 ><HEAD 3 ><TITLE 4 >SDL_GetRGBA</TITLE 5 ><META 6 NAME="GENERATOR" 7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ 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 SUMMARY="Header navigation table" 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="sdlgetrgb.html" 49 ACCESSKEY="P" 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="sdlcreatergbsurface.html" 63 ACCESSKEY="N" 64 >Next</A 65 ></TD 66 ></TR 67 ></TABLE 68 ><HR 69 ALIGN="LEFT" 70 WIDTH="100%"></DIV 71 ><H1 72 ><A 73 NAME="SDLGETRGBA" 74 ></A 75 >SDL_GetRGBA</H1 76 ><DIV 77 CLASS="REFNAMEDIV" 78 ><A 79 NAME="AEN1747" 80 ></A 81 ><H2 82 >Name</H2 83 >SDL_GetRGBA -- Get RGBA values from a pixel in the specified pixel format.</DIV 84 ><DIV 85 CLASS="REFSYNOPSISDIV" 86 ><A 87 NAME="AEN1750" 88 ></A 89 ><H2 90 >Synopsis</H2 91 ><DIV 92 CLASS="FUNCSYNOPSIS" 93 ><A 94 NAME="AEN1751" 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 >void <B 106 CLASS="FSFUNC" 107 >SDL_GetRGBA</B 108 ></CODE 109 >(Uint32 pixel, SDL_PixelFormat *fmt, Uint8 *r, Uint8 *g, Uint8 *b, Uint8 *a);</CODE 110 ></P 111 ><P 112 ></P 113 ></DIV 114 ></DIV 115 ><DIV 116 CLASS="REFSECT1" 117 ><A 118 NAME="AEN1757" 119 ></A 120 ><H2 121 >Description</H2 122 ><P 123 >Get RGBA component values from a pixel stored in the specified pixel format.</P 124 ><P 125 >This function uses the entire 8-bit [0..255] range when converting color 126 components from pixel formats with less than 8-bits per RGB component 127 (e.g., a completely white pixel in 16-bit RGB565 format would return 128 [0xff, 0xff, 0xff] not [0xf8, 0xfc, 0xf8]).</P 129 ><P 130 >If the surface has no alpha component, the alpha will be returned as 0xff 131 (100% opaque).</P 132 ></DIV 133 ><DIV 134 CLASS="REFSECT1" 135 ><A 136 NAME="AEN1762" 137 ></A 138 ><H2 139 >See Also</H2 140 ><P 141 ><A 142 HREF="sdlgetrgb.html" 143 >SDL_GetRGB</A 144 >, 145 <A 146 HREF="sdlmaprgb.html" 147 >SDL_MapRGB</A 148 >, 149 <A 150 HREF="sdlmaprgba.html" 151 >SDL_MapRGBA</A 152 >, 153 <A 154 HREF="sdlpixelformat.html" 155 >SDL_PixelFormat</A 156 ></P 157 ></DIV 158 ><DIV 159 CLASS="NAVFOOTER" 160 ><HR 161 ALIGN="LEFT" 162 WIDTH="100%"><TABLE 163 SUMMARY="Footer navigation table" 164 WIDTH="100%" 165 BORDER="0" 166 CELLPADDING="0" 167 CELLSPACING="0" 168 ><TR 169 ><TD 170 WIDTH="33%" 171 ALIGN="left" 172 VALIGN="top" 173 ><A 174 HREF="sdlgetrgb.html" 175 ACCESSKEY="P" 176 >Prev</A 177 ></TD 178 ><TD 179 WIDTH="34%" 180 ALIGN="center" 181 VALIGN="top" 182 ><A 183 HREF="index.html" 184 ACCESSKEY="H" 185 >Home</A 186 ></TD 187 ><TD 188 WIDTH="33%" 189 ALIGN="right" 190 VALIGN="top" 191 ><A 192 HREF="sdlcreatergbsurface.html" 193 ACCESSKEY="N" 194 >Next</A 195 ></TD 196 ></TR 197 ><TR 198 ><TD 199 WIDTH="33%" 200 ALIGN="left" 201 VALIGN="top" 202 >SDL_GetRGB</TD 203 ><TD 204 WIDTH="34%" 205 ALIGN="center" 206 VALIGN="top" 207 ><A 208 HREF="video.html" 209 ACCESSKEY="U" 210 >Up</A 211 ></TD 212 ><TD 213 WIDTH="33%" 214 ALIGN="right" 215 VALIGN="top" 216 >SDL_CreateRGBSurface</TD 217 ></TR 218 ></TABLE 219 ></DIV 220 ></BODY 221 ></HTML 222 >
