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annotate docs/html/sdldisplayformatalpha.html @ 4159:a1b03ba2fcd0 SDL-1.2
Updated copyright date
author | Sam Lantinga <slouken@libsdl.org> |
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date | Mon, 08 Dec 2008 00:25:42 +0000 |
parents | 355632dca928 |
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rev | line source |
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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 1.76b+ |
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 | |
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31 SUMMARY="Header navigation table" |
0 | 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="sdldisplayformat.html" | |
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49 ACCESSKEY="P" |
0 | 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="sdlwarpmouse.html" | |
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63 ACCESSKEY="N" |
0 | 64 >Next</A |
65 ></TD | |
66 ></TR | |
67 ></TABLE | |
68 ><HR | |
69 ALIGN="LEFT" | |
70 WIDTH="100%"></DIV | |
71 ><H1 | |
72 ><A | |
73 NAME="SDLDISPLAYFORMATALPHA" | |
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74 ></A |
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75 >SDL_DisplayFormatAlpha</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
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79 NAME="AEN2432" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_DisplayFormatAlpha -- Convert a surface to the display format</DIV | |
84 ><DIV | |
85 CLASS="REFSYNOPSISDIV" | |
86 ><A | |
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87 NAME="AEN2435" |
0 | 88 ></A |
89 ><H2 | |
90 >Synopsis</H2 | |
91 ><DIV | |
92 CLASS="FUNCSYNOPSIS" | |
93 ><A | |
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94 NAME="AEN2436" |
0 | 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 >SDL_Surface *<B | |
106 CLASS="FSFUNC" | |
107 >SDL_DisplayFormatAlpha</B | |
108 ></CODE | |
109 >(SDL_Surface *surface);</CODE | |
110 ></P | |
111 ><P | |
112 ></P | |
113 ></DIV | |
114 ></DIV | |
115 ><DIV | |
116 CLASS="REFSECT1" | |
117 ><A | |
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118 NAME="AEN2442" |
0 | 119 ></A |
120 ><H2 | |
121 >Description</H2 | |
122 ><P | |
123 >This function takes a surface and copies it to a new surface of the | |
124 pixel format and colors of the video framebuffer plus an alpha channel, | |
125 suitable for fast blitting onto the display surface. It calls | |
126 <A | |
127 HREF="sdlconvertsurface.html" | |
128 >SDL_ConvertSurface</A | |
129 ></P | |
130 ><P | |
131 >If you want to take advantage of hardware colorkey or alpha blit | |
132 acceleration, you should set the colorkey and alpha value before | |
133 calling this function.</P | |
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134 ><P |
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135 >This function can be used to convert a colourkey to an alpha channel, |
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136 if the <TT |
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137 CLASS="LITERAL" |
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138 >SDL_SRCCOLORKEY</TT |
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139 > flag is set on the surface. |
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140 The generated surface will then be transparent (alpha=0) where the |
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141 pixels match the colourkey, and opaque (alpha=255) elsewhere.</P |
0 | 142 ></DIV |
143 ><DIV | |
144 CLASS="REFSECT1" | |
145 ><A | |
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146 NAME="AEN2449" |
0 | 147 ></A |
148 ><H2 | |
149 >Return Value</H2 | |
150 ><P | |
151 >If the conversion fails or runs out of memory, it returns | |
152 <SPAN | |
153 CLASS="RETURNVALUE" | |
154 >NULL</SPAN | |
155 ></P | |
156 ></DIV | |
157 ><DIV | |
158 CLASS="REFSECT1" | |
159 ><A | |
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160 NAME="AEN2453" |
0 | 161 ></A |
162 ><H2 | |
163 >See Also</H2 | |
164 ><P | |
165 ><A | |
166 HREF="sdlconvertsurface.html" | |
167 >SDL_ConvertSurface</A | |
168 >, | |
169 <A | |
170 HREF="sdlsetalpha.html" | |
171 >SDL_SetAlpha</A | |
172 >, | |
173 <A | |
174 HREF="sdlsetcolorkey.html" | |
175 >SDL_SetColorKey</A | |
176 >, | |
177 <A | |
178 HREF="sdldisplayformat.html" | |
179 >SDL_DisplayFormat</A | |
180 >, | |
181 <A | |
182 HREF="sdlsurface.html" | |
183 >SDL_Surface</A | |
184 ></P | |
185 ></DIV | |
186 ><DIV | |
187 CLASS="NAVFOOTER" | |
188 ><HR | |
189 ALIGN="LEFT" | |
190 WIDTH="100%"><TABLE | |
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191 SUMMARY="Footer navigation table" |
0 | 192 WIDTH="100%" |
193 BORDER="0" | |
194 CELLPADDING="0" | |
195 CELLSPACING="0" | |
196 ><TR | |
197 ><TD | |
198 WIDTH="33%" | |
199 ALIGN="left" | |
200 VALIGN="top" | |
201 ><A | |
202 HREF="sdldisplayformat.html" | |
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203 ACCESSKEY="P" |
0 | 204 >Prev</A |
205 ></TD | |
206 ><TD | |
207 WIDTH="34%" | |
208 ALIGN="center" | |
209 VALIGN="top" | |
210 ><A | |
211 HREF="index.html" | |
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212 ACCESSKEY="H" |
0 | 213 >Home</A |
214 ></TD | |
215 ><TD | |
216 WIDTH="33%" | |
217 ALIGN="right" | |
218 VALIGN="top" | |
219 ><A | |
220 HREF="sdlwarpmouse.html" | |
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221 ACCESSKEY="N" |
0 | 222 >Next</A |
223 ></TD | |
224 ></TR | |
225 ><TR | |
226 ><TD | |
227 WIDTH="33%" | |
228 ALIGN="left" | |
229 VALIGN="top" | |
230 >SDL_DisplayFormat</TD | |
231 ><TD | |
232 WIDTH="34%" | |
233 ALIGN="center" | |
234 VALIGN="top" | |
235 ><A | |
236 HREF="video.html" | |
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237 ACCESSKEY="U" |
0 | 238 >Up</A |
239 ></TD | |
240 ><TD | |
241 WIDTH="33%" | |
242 ALIGN="right" | |
243 VALIGN="top" | |
244 >SDL_WarpMouse</TD | |
245 ></TR | |
246 ></TABLE | |
247 ></DIV | |
248 ></BODY | |
249 ></HTML | |
250 > |