Mercurial > sdl-ios-xcode
annotate docs/html/sdldisplayformatalpha.html @ 1282:217f5d5a49e5
Date: Sat, 15 Jan 2005 02:01:51 +0000 (UTC)
From: jimrandomh
Subject: [SDL] Re: Modifier keys pressed during initialization stick
I wrote a simple test program which initializes SDL, prints the SDL
version number, then prints any keydown and keyup events with their
modifiers. (Source code below). Compilation was done using Visual
Studio 6, release mode.
My test sequence was:
Start a command prompt. Type the name of the test program.
shift down
enter down (program starts)
Wait for window to appear
enter up
shift up
spacebar down
spacebar up
Under Windows 98, the output was correct:
SDL 1.2.8
left shift down
shift-return down
shift-return up
left shift up
space down
space up
Under Windows 2000 and under Windows XP, the output was:
SDL 1.2.8
shift-space down
shift-space up
Since shift was not held at the time space was pressed, this is
incorrect. Similar results were observed with launching in different
ways (including double-clicking in Windows Explorer), so it does not
depend on the launching terminal.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 29 Jan 2006 07:57:13 +0000 |
parents | 355632dca928 |
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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 | |
55
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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 > |