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Initial revision
author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
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children 55f1f1b3e27d
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1 <HTML
2 ><HEAD
3 ><TITLE
4 >SDL_GetRGBA</TITLE
5 ><META
6 NAME="GENERATOR"
7 CONTENT="Modular DocBook HTML Stylesheet Version 1.61
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
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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
76 NAME="AEN1290"
77 ></A
78 ><H2
79 >Name</H2
80 >SDL_GetRGBA&nbsp;--&nbsp;Get RGBA values from a pixel in the specified pixel format.</DIV
81 ><DIV
82 CLASS="REFSYNOPSISDIV"
83 ><A
84 NAME="AEN1293"
85 ></A
86 ><H2
87 >Synopsis</H2
88 ><DIV
89 CLASS="FUNCSYNOPSIS"
90 ><A
91 NAME="AEN1294"
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
115 NAME="AEN1300"
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
133 NAME="AEN1305"
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
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212 ></BODY
213 ></HTML
214 >