Mercurial > sdl-ios-xcode
annotate docs/html/sdldisplayformatalpha.html @ 3096:ae4e80dbe330
Date: Tue, 17 Feb 2009 14:00:25 +0100
From: Stefan Klug
Subject: [SDL] Possible bug, paused audio playing garbage
On my WinCE device a paused audio device plays random garbage.
This might also be the issue in the thread "sound cracks with SDL_mixer
and AUDIO_S16LSB"
I don't have that much knowledge of the SDL audio part, but the attached
patch fixes it for me, and collapses two redundant ifs.
I'm not sure if this is the correct way to fix this.
Shouldn't the complete stream conversion part of the RunAudio loop be
dependent on the paused property of the device? (not only the call to
(*fill)(udata, istream, istream_len).
Anyways. Would be great if the patch or a fix could find its way to SVN ;-)
Cheers
Stefan
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 23 Mar 2009 05:21:40 +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 > |