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symbian-qemu-0.9.1-12/libsdl-trunk/docs/html/sdlsetgamma.html
author William Roberts <williamr@symbian.org>
Fri, 07 Aug 2009 11:20:16 +0100
changeset 7 b016402e601c
parent 1 2fb8b9db1c86
permissions -rw-r--r--
Fix E32PATH to make bootstrap compile correctly, tidy up other extension option paths
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<HTML
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><HEAD
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><TITLE
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>SDL_SetGamma</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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"><LINK
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REL="HOME"
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TITLE="SDL Library Documentation"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="Video"
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HREF="video.html"><LINK
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REL="PREVIOUS"
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TITLE="SDL_SetPalette"
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HREF="sdlsetpalette.html"><LINK
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REL="NEXT"
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TITLE="SDL_GetGammaRamp"
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HREF="sdlgetgammaramp.html"></HEAD
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><BODY
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CLASS="REFENTRY"
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BGCOLOR="#FFF8DC"
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TEXT="#000000"
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LINK="#0000ee"
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VLINK="#551a8b"
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ALINK="#ff0000"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>SDL Library Documentation</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="sdlsetpalette.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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></TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="sdlgetgammaramp.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><H1
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><A
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NAME="SDLSETGAMMA"
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></A
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>SDL_SetGamma</H1
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><DIV
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CLASS="REFNAMEDIV"
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><A
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NAME="AEN1569"
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></A
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><H2
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>Name</H2
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>SDL_SetGamma&nbsp;--&nbsp;Sets the color gamma function for the display</DIV
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><DIV
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CLASS="REFSYNOPSISDIV"
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><A
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NAME="AEN1572"
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></A
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><H2
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>Synopsis</H2
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><DIV
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CLASS="FUNCSYNOPSIS"
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><A
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NAME="AEN1573"
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></A
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><P
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></P
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><PRE
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CLASS="FUNCSYNOPSISINFO"
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>#include "SDL.h"</PRE
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><P
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><CODE
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><CODE
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CLASS="FUNCDEF"
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>int <B
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CLASS="FSFUNC"
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>SDL_SetGamma</B
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></CODE
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>(float redgamma, float greengamma, float bluegamma);</CODE
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></P
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><P
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></P
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></DIV
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN1579"
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></A
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><H2
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>Description</H2
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><P
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>Sets the "gamma function" for the display of each color component.  Gamma
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controls the brightness/contrast of colors displayed on the screen.
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A gamma value of <TT
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CLASS="CONSTANT"
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>1.0</TT
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> is identity (i.e., no adjustment
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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is made).</P
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><P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>This function adjusts the gamma based on the "gamma function" parameter,
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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you can directly specify lookup tables for gamma adjustment with
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<A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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HREF="sdlsetgammaramp.html"
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>SDL_SetGammaRamp</A
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>.</P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>Not all display hardware is able to change gamma.</P
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN1586"
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></A
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><H2
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>Return Value</H2
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><P
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>Returns -1 on error (or if gamma adjustment is not supported).</P
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></DIV
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><DIV
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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CLASS="REFSECT1"
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><A
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NAME="AEN1589"
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></A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><H2
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>See Also</H2
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><P
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><A
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HREF="sdlgetgammaramp.html"
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>SDL_GetGammaRamp</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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<A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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HREF="sdlsetgammaramp.html"
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>SDL_SetGammaRamp</A
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></P
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></DIV
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><DIV
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CLASS="NAVFOOTER"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><HR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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ALIGN="LEFT"
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WIDTH="100%"><TABLE
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SUMMARY="Footer navigation table"
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WIDTH="100%"
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   174
 
BORDER="0"
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CELLPADDING="0"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   176
 
CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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VALIGN="top"
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><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   183
 
HREF="sdlsetpalette.html"
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   184
 
ACCESSKEY="P"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>Prev</A
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></TD
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><TD
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   188
 
WIDTH="34%"
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   189
 
ALIGN="center"
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   190
 
VALIGN="top"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   191
 
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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diff changeset 
   192
 
HREF="index.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   193
 
ACCESSKEY="H"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   194
 
>Home</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   195
 
></TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   196
 
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   197
 
WIDTH="33%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   198
 
ALIGN="right"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   199
 
VALIGN="top"
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><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   201
 
HREF="sdlgetgammaramp.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   202
 
ACCESSKEY="N"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   203
 
>Next</A
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   204
 
></TD
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></TR
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   211
 
>SDL_SetPalette</TD
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   212
 
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   213
 
WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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   216
 
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   217
 
HREF="video.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   218
 
ACCESSKEY="U"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   219
 
>Up</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
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   224
 
VALIGN="top"
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   225
 
>SDL_GetGammaRamp</TD
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></TR
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></TABLE
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></DIV
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></BODY
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></HTML
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>
FCL/interim/QEMU