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Date: Tue, 12 Aug 2003 14:26:19 +0200 (MEST) From: "Mattias Engdeg?rd" Subject: bug in SDL_GetRGB/GetRGBA There's an embarrassing bug in GetRGB/GetRGBA which apparently has been there for years. It incorrectly converts colours with < 8 bits/channel. It came to my attention today in #sdl. What it does now is (for each channel): rv = (pixel & fmt->Rmask) >> fmt->Rshift; *r = (rv << fmt->Rloss) + (rv >> (8 - fmt->Rloss)); which is wrong; the last line should be *r = (rv << fmt->Rloss) + (rv >> (8 - (fmt->Rloss << 1)));
author Sam Lantinga <slouken@libsdl.org>
date Tue, 12 Aug 2003 15:17:20 +0000
parents e5bc29de3f0a
children 355632dca928
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<HTML
><HEAD
><TITLE
>SDL_CDName</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.64
"><LINK
REL="HOME"
TITLE="SDL Library Documentation"
HREF="index.html"><LINK
REL="UP"
TITLE="CD-ROM"
HREF="cdrom.html"><LINK
REL="PREVIOUS"
TITLE="SDL_CDNumDrives"
HREF="sdlcdnumdrives.html"><LINK
REL="NEXT"
TITLE="SDL_CDOpen"
HREF="sdlcdopen.html"></HEAD
><BODY
CLASS="REFENTRY"
BGCOLOR="#FFF8DC"
TEXT="#000000"
LINK="#0000ee"
VLINK="#551a8b"
ALINK="#ff0000"
><DIV
CLASS="NAVHEADER"
><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="sdlcdnumdrives.html"
>Prev</A
></TD
><TD
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ALIGN="center"
VALIGN="bottom"
></TD
><TD
WIDTH="10%"
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VALIGN="bottom"
><A
HREF="sdlcdopen.html"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><H1
><A
NAME="SDLCDNAME"
>SDL_CDName</A
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN6852"
></A
><H2
>Name</H2
>SDL_CDName&nbsp;--&nbsp;Returns a human-readable, system-dependent identifier for the CD-ROM.</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN6855"
></A
><H2
>Synopsis</H2
><DIV
CLASS="FUNCSYNOPSIS"
><A
NAME="AEN6856"
></A
><P
></P
><PRE
CLASS="FUNCSYNOPSISINFO"
>#include "SDL.h"</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>const char *<B
CLASS="FSFUNC"
>SDL_CDName</B
></CODE
>(int drive);</CODE
></P
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN6862"
></A
><H2
>Description</H2
><P
>Returns a human-readable, system-dependent identifier for the CD-ROM. <TT
CLASS="PARAMETER"
><I
>drive</I
></TT
> is the index of the drive. Drive indices start to 0 and end at <TT
CLASS="FUNCTION"
>SDL_CDNumDrives()</TT
>-1.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN6867"
></A
><H2
>Examples</H2
><P
><P
></P
><UL
><LI
><P
>"/dev/cdrom"</P
></LI
><LI
><P
>"E:"</P
></LI
><LI
><P
>"/dev/disk/ide/1/master"</P
></LI
></UL
></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN6877"
></A
><H2
>See Also</H2
><P
><A
HREF="sdlcdnumdrives.html"
><TT
CLASS="FUNCTION"
>SDL_CDNumDrives</TT
></A
></P
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="sdlcdnumdrives.html"
>Prev</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="index.html"
>Home</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="sdlcdopen.html"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>SDL_CDNumDrives</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="cdrom.html"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>SDL_CDOpen</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>