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view docs/html/sdlsetcolors.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 |
children |
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<HTML ><HEAD ><TITLE >SDL_SetColors</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ "><LINK REL="HOME" TITLE="SDL Library Documentation" HREF="index.html"><LINK REL="UP" TITLE="Video" HREF="video.html"><LINK REL="PREVIOUS" TITLE="SDL_Flip" HREF="sdlflip.html"><LINK REL="NEXT" TITLE="SDL_SetPalette" HREF="sdlsetpalette.html"></HEAD ><BODY CLASS="REFENTRY" BGCOLOR="#FFF8DC" TEXT="#000000" LINK="#0000ee" VLINK="#551a8b" ALINK="#ff0000" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >SDL Library Documentation</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="sdlflip.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="sdlsetpalette.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="SDLSETCOLORS" ></A >SDL_SetColors</H1 ><DIV CLASS="REFNAMEDIV" ><A NAME="AEN1462" ></A ><H2 >Name</H2 >SDL_SetColors -- Sets a portion of the colormap for the given 8-bit surface.</DIV ><DIV CLASS="REFSYNOPSISDIV" ><A NAME="AEN1465" ></A ><H2 >Synopsis</H2 ><DIV CLASS="FUNCSYNOPSIS" ><A NAME="AEN1466" ></A ><P ></P ><PRE CLASS="FUNCSYNOPSISINFO" >#include "SDL.h"</PRE ><P ><CODE ><CODE CLASS="FUNCDEF" >int <B CLASS="FSFUNC" >SDL_SetColors</B ></CODE >(SDL_Surface *surface, SDL_Color *colors, int firstcolor, int ncolors);</CODE ></P ><P ></P ></DIV ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN1472" ></A ><H2 >Description</H2 ><P >Sets a portion of the colormap for the given 8-bit surface.</P ><P >When <TT CLASS="PARAMETER" ><I >surface</I ></TT > is the surface associated with the current display, the display colormap will be updated with the requested colors. If <TT CLASS="LITERAL" >SDL_HWPALETTE</TT > was set in <A HREF="sdlsetvideomode.html" >SDL_SetVideoMode</A > flags, <TT CLASS="FUNCTION" >SDL_SetColors</TT > will always return <SPAN CLASS="RETURNVALUE" >1</SPAN >, and the palette is guaranteed to be set the way you desire, even if the window colormap has to be warped or run under emulation.</P ><P >The color components of a <A HREF="sdlcolor.html" ><SPAN CLASS="STRUCTNAME" >SDL_Color</SPAN ></A > structure are 8-bits in size, giving you a total of 256<SUP >3</SUP > =16777216 colors.</P ><P >Palettized (8-bit) screen surfaces with the <TT CLASS="LITERAL" >SDL_HWPALETTE</TT > flag have two palettes, a logical palette that is used for mapping blits to/from the surface and a physical palette (that determines how the hardware will map the colors to the display). <TT CLASS="FUNCTION" >SDL_SetColors</TT > modifies both palettes (if present), and is equivalent to calling <A HREF="sdlsetpalette.html" >SDL_SetPalette</A > with the <TT CLASS="PARAMETER" ><I >flags</I ></TT > set to <TT CLASS="LITERAL" >(SDL_LOGPAL | SDL_PHYSPAL)</TT >.</P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN1491" ></A ><H2 >Return Value</H2 ><P >If <TT CLASS="PARAMETER" ><I >surface</I ></TT > is not a palettized surface, this function does nothing, returning <SPAN CLASS="RETURNVALUE" >0</SPAN >. If all of the colors were set as passed to <TT CLASS="FUNCTION" >SDL_SetColors</TT >, it will return <SPAN CLASS="RETURNVALUE" >1</SPAN >. If not all the color entries were set exactly as given, it will return <SPAN CLASS="RETURNVALUE" >0</SPAN >, and you should look at the surface palette to determine the actual color palette.</P ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN1499" ></A ><H2 >Example</H2 ><PRE CLASS="PROGRAMLISTING" >/* Create a display surface with a grayscale palette */ SDL_Surface *screen; SDL_Color colors[256]; int i; . . . /* Fill colors with color information */ for(i=0;i<256;i++){ colors[i].r=i; colors[i].g=i; colors[i].b=i; } /* Create display */ screen=SDL_SetVideoMode(640, 480, 8, SDL_HWPALETTE); if(!screen){ printf("Couldn't set video mode: %s\n", SDL_GetError()); exit(-1); } /* Set palette */ SDL_SetColors(screen, colors, 0, 256); . . . .</PRE ></DIV ><DIV CLASS="REFSECT1" ><A NAME="AEN1502" ></A ><H2 >See Also</H2 ><P ><A HREF="sdlcolor.html" ><SPAN CLASS="STRUCTNAME" >SDL_Color</SPAN ></A > <A HREF="sdlsurface.html" ><SPAN CLASS="STRUCTNAME" >SDL_Surface</SPAN ></A >, <A HREF="sdlsetpalette.html" ><TT CLASS="FUNCTION" >SDL_SetPalette</TT ></A >, <A HREF="sdlsetvideomode.html" ><TT CLASS="FUNCTION" >SDL_SetVideoMode</TT ></A ></P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="sdlflip.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="sdlsetpalette.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >SDL_Flip</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="video.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >SDL_SetPalette</TD ></TR ></TABLE ></DIV ></BODY ></HTML >