symbian-qemu-0.9.1-12/libsdl-trunk/docs/html/sdldisplayformatalpha.html
author johnathan.white@2718R8BGH51.accenture.com
Mon, 08 Mar 2010 18:45:03 +0000
changeset 46 b6935a90ca64
parent 1 2fb8b9db1c86
permissions -rw-r--r--
Modify framebuffer and NGA framebuffer to read screen size from board model dtb file. Optimise memory usuage of frame buffer Add example minigui application with hooks to profiler (which writes results to S:\). Modified NGA framebuffer to run its own dfc queue at high priority
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_DisplayFormatAlpha</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_DisplayFormat"
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HREF="sdldisplayformat.html"><LINK
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REL="NEXT"
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TITLE="SDL_WarpMouse"
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HREF="sdlwarpmouse.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="sdldisplayformat.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="sdlwarpmouse.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="SDLDISPLAYFORMATALPHA"
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></A
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>SDL_DisplayFormatAlpha</H1
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><DIV
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CLASS="REFNAMEDIV"
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><A
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NAME="AEN2432"
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></A
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><H2
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>Name</H2
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>SDL_DisplayFormatAlpha&nbsp;--&nbsp;Convert a surface to the display format</DIV
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><DIV
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CLASS="REFSYNOPSISDIV"
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><A
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NAME="AEN2435"
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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="AEN2436"
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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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>SDL_Surface *<B
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CLASS="FSFUNC"
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>SDL_DisplayFormatAlpha</B
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></CODE
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>(SDL_Surface *surface);</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="AEN2442"
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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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>This function takes a surface and copies it to a new surface of the
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pixel format and colors of the video framebuffer plus an alpha channel,
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suitable for fast blitting onto the display surface.  It calls
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<A
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HREF="sdlconvertsurface.html"
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>SDL_ConvertSurface</A
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></P
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><P
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>If you want to take advantage of hardware colorkey or alpha blit
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acceleration, you should set the colorkey and alpha value before
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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calling this function.</P
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><P
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>This function can be used to convert a colourkey to an alpha channel,
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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if the <TT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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CLASS="LITERAL"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>SDL_SRCCOLORKEY</TT
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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> flag is set on the surface.
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   140
The generated surface will then be transparent (alpha=0) where the
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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pixels match the colourkey, and opaque (alpha=255) elsewhere.</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="AEN2449"
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   147
></A
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><H2
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>Return Value</H2
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><P
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>If the conversion fails or runs out of memory, it returns
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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<SPAN
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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CLASS="RETURNVALUE"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>NULL</SPAN
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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></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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   158
CLASS="REFSECT1"
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><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   160
NAME="AEN2453"
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   161
></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="sdlconvertsurface.html"
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>SDL_ConvertSurface</A
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   168
>,
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   169
<A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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HREF="sdlsetalpha.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>SDL_SetAlpha</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   172
>,
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   173
<A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   174
HREF="sdlsetcolorkey.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>SDL_SetColorKey</A
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   176
>,
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   177
<A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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HREF="sdldisplayformat.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>SDL_DisplayFormat</A
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>,
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   181
<A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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HREF="sdlsurface.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>SDL_Surface</A
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></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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   187
CLASS="NAVFOOTER"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   188
><HR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   189
ALIGN="LEFT"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   190
WIDTH="100%"><TABLE
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   191
SUMMARY="Footer navigation table"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   192
WIDTH="100%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   193
BORDER="0"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   194
CELLPADDING="0"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   195
CELLSPACING="0"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   196
><TR
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   197
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   198
WIDTH="33%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   199
ALIGN="left"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   200
VALIGN="top"
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   201
><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   202
HREF="sdldisplayformat.html"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   203
ACCESSKEY="P"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>Prev</A
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   205
></TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   206
><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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WIDTH="34%"
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ALIGN="center"
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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   211
HREF="index.html"
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   212
ACCESSKEY="H"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   213
>Home</A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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></TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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WIDTH="33%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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ALIGN="right"
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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   220
HREF="sdlwarpmouse.html"
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   221
ACCESSKEY="N"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>Next</A
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></TD
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></TR
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><TR
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><TD
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WIDTH="33%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   228
ALIGN="left"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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VALIGN="top"
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>SDL_DisplayFormat</TD
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><TD
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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WIDTH="34%"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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ALIGN="center"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   234
VALIGN="top"
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><A
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   236
HREF="video.html"
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   237
ACCESSKEY="U"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>Up</A
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></TD
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><TD
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WIDTH="33%"
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ALIGN="right"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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VALIGN="top"
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>SDL_WarpMouse</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
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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>