Mercurial > sdl-ios-xcode
annotate docs/html/sdlenableunicode.html @ 3880:74e828c64315 SDL-1.2
Fixed bug #292
I might be on crack here.
It looks like SDL_ConvertMono() in src/audio/SDL_audiocvt.c adds the left and
right channels of a stereo stream together, and clamps the new mono channel if
it would overflow.
Shouldn't it be dividing by 2 to average the two sample points instead of
clamping? Otherwise the mono sample point's volume doubles in the conversion.
This would also make the conversion faster, as it replaces two branches per
sample frame with a bitwise shift.
--ryan.
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 24 Sep 2006 15:45:37 +0000 |
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0 | 1 <HTML |
2 ><HEAD | |
3 ><TITLE | |
4 >SDL_EnableUNICODE</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="Event Functions." | |
14 HREF="eventfunctions.html"><LINK | |
15 REL="PREVIOUS" | |
16 TITLE="SDL_GetKeyName" | |
17 HREF="sdlgetkeyname.html"><LINK | |
18 REL="NEXT" | |
19 TITLE="SDL_EnableKeyRepeat" | |
20 HREF="sdlenablekeyrepeat.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="sdlgetkeyname.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="sdlenablekeyrepeat.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="SDLENABLEUNICODE" | |
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74 ></A |
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75 >SDL_EnableUNICODE</H1 |
0 | 76 ><DIV |
77 CLASS="REFNAMEDIV" | |
78 ><A | |
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79 NAME="AEN5805" |
0 | 80 ></A |
81 ><H2 | |
82 >Name</H2 | |
83 >SDL_EnableUNICODE -- Enable UNICODE translation</DIV | |
84 ><DIV | |
85 CLASS="REFSYNOPSISDIV" | |
86 ><A | |
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87 NAME="AEN5808" |
0 | 88 ></A |
89 ><H2 | |
90 >Synopsis</H2 | |
91 ><DIV | |
92 CLASS="FUNCSYNOPSIS" | |
93 ><A | |
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94 NAME="AEN5809" |
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 >int <B | |
106 CLASS="FSFUNC" | |
107 >SDL_EnableUNICODE</B | |
108 ></CODE | |
109 >(int enable);</CODE | |
110 ></P | |
111 ><P | |
112 ></P | |
113 ></DIV | |
114 ></DIV | |
115 ><DIV | |
116 CLASS="REFSECT1" | |
117 ><A | |
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118 NAME="AEN5815" |
0 | 119 ></A |
120 ><H2 | |
121 >Description</H2 | |
122 ><P | |
181
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123 >Enables/Disables Unicode keyboard translation.</P |
0 | 124 ><P |
181
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125 >To obtain the character codes corresponding to received keyboard events, |
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126 Unicode translation must first be turned on using this function. The |
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127 translation incurs a slight overhead for each keyboard event and is therefore |
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128 disabled by default. For each subsequently received key down event, the |
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129 <TT |
0 | 130 CLASS="STRUCTFIELD" |
131 ><I | |
132 >unicode</I | |
133 ></TT | |
181
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134 > member of the |
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135 <A |
0 | 136 HREF="sdlkeysym.html" |
137 ><SPAN | |
138 CLASS="STRUCTNAME" | |
139 >SDL_keysym</SPAN | |
140 ></A | |
181
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141 > structure |
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142 will then contain the corresponding character code, or zero for keysyms that do |
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143 not correspond to any character code.</P |
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144 ><P |
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145 >A value of 1 for <TT |
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146 CLASS="PARAMETER" |
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147 ><I |
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148 >enable</I |
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149 ></TT |
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150 > enables Unicode translation; |
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151 0 disables it, and -1 leaves it unchanged (useful for querying the current |
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152 translation mode).</P |
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153 ><P |
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154 >Note that only key press events will be translated, not release events.</P |
0 | 155 ></DIV |
156 ><DIV | |
157 CLASS="REFSECT1" | |
158 ><A | |
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159 NAME="AEN5825" |
0 | 160 ></A |
161 ><H2 | |
162 >Return Value</H2 | |
163 ><P | |
181
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164 >Returns the previous translation mode (<SPAN |
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165 CLASS="RETURNVALUE" |
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166 >0</SPAN |
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167 > or <SPAN |
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168 CLASS="RETURNVALUE" |
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169 >1</SPAN |
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170 >).</P |
0 | 171 ></DIV |
172 ><DIV | |
173 CLASS="REFSECT1" | |
174 ><A | |
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175 NAME="AEN5830" |
0 | 176 ></A |
177 ><H2 | |
178 >See Also</H2 | |
179 ><P | |
180 ><A | |
181 HREF="sdlkeysym.html" | |
182 ><SPAN | |
183 CLASS="STRUCTNAME" | |
184 >SDL_keysym</SPAN | |
185 ></A | |
186 ></P | |
187 ></DIV | |
188 ><DIV | |
189 CLASS="NAVFOOTER" | |
190 ><HR | |
191 ALIGN="LEFT" | |
192 WIDTH="100%"><TABLE | |
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193 SUMMARY="Footer navigation table" |
0 | 194 WIDTH="100%" |
195 BORDER="0" | |
196 CELLPADDING="0" | |
197 CELLSPACING="0" | |
198 ><TR | |
199 ><TD | |
200 WIDTH="33%" | |
201 ALIGN="left" | |
202 VALIGN="top" | |
203 ><A | |
204 HREF="sdlgetkeyname.html" | |
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205 ACCESSKEY="P" |
0 | 206 >Prev</A |
207 ></TD | |
208 ><TD | |
209 WIDTH="34%" | |
210 ALIGN="center" | |
211 VALIGN="top" | |
212 ><A | |
213 HREF="index.html" | |
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214 ACCESSKEY="H" |
0 | 215 >Home</A |
216 ></TD | |
217 ><TD | |
218 WIDTH="33%" | |
219 ALIGN="right" | |
220 VALIGN="top" | |
221 ><A | |
222 HREF="sdlenablekeyrepeat.html" | |
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223 ACCESSKEY="N" |
0 | 224 >Next</A |
225 ></TD | |
226 ></TR | |
227 ><TR | |
228 ><TD | |
229 WIDTH="33%" | |
230 ALIGN="left" | |
231 VALIGN="top" | |
232 >SDL_GetKeyName</TD | |
233 ><TD | |
234 WIDTH="34%" | |
235 ALIGN="center" | |
236 VALIGN="top" | |
237 ><A | |
238 HREF="eventfunctions.html" | |
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239 ACCESSKEY="U" |
0 | 240 >Up</A |
241 ></TD | |
242 ><TD | |
243 WIDTH="33%" | |
244 ALIGN="right" | |
245 VALIGN="top" | |
246 >SDL_EnableKeyRepeat</TD | |
247 ></TR | |
248 ></TABLE | |
249 ></DIV | |
250 ></BODY | |
251 ></HTML | |
252 > |