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symbian-qemu-0.9.1-12/libsdl-trunk/docs/html/guideeventexamples.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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>Event Examples</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="Examples"
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HREF="guideexamples.html"><LINK
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REL="PREVIOUS"
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TITLE="Examples"
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HREF="guideexamples.html"><LINK
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REL="NEXT"
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TITLE="Audio Examples"
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HREF="guideaudioexamples.html"></HEAD
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><BODY
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CLASS="SECT1"
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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="guideexamples.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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>Chapter 4. Examples</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="guideaudioexamples.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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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="GUIDEEVENTEXAMPLES"
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></A
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>Event Examples</H1
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><P
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></P
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="AEN375"
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></A
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>Filtering and Handling Events</H2
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><P
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><PRE
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CLASS="PROGRAMLISTING"
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>#include &#60;stdio.h&#62;
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#include &#60;stdlib.h&#62;
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#include "SDL.h"













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/* This function may run in a separate event thread */













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    98


int FilterEvents(const SDL_Event *event) {













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    static int boycott = 1;













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    /* This quit event signals the closing of the window */













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    if ( (event-&#62;type == SDL_QUIT) &#38;&#38; boycott ) {













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        printf("Quit event filtered out -- try again.\n");













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        boycott = 0;













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        return(0);













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    }













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    if ( event-&#62;type == SDL_MOUSEMOTION ) {













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        printf("Mouse moved to (%d,%d)\n",













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                event-&#62;motion.x, event-&#62;motion.y);













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        return(0);    /* Drop it, we've handled it */













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   111


    }













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    return(1);













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   113


}













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   114














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int main(int argc, char *argv[])













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{













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    SDL_Event event;













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   118














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    /* Initialize the SDL library (starts the event loop) */













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   120


    if ( SDL_Init(SDL_INIT_VIDEO) &#60; 0 ) {













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   121


        fprintf(stderr,













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   122


                "Couldn't initialize SDL: %s\n", SDL_GetError());













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   123


        exit(1);













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   124


    }













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   125














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   126


    /* Clean up on exit, exit on window close and interrupt */













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   127


    atexit(SDL_Quit);













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   128














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   129


    /* Ignore key events */













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   130


    SDL_EventState(SDL_KEYDOWN, SDL_IGNORE);













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   131


    SDL_EventState(SDL_KEYUP, SDL_IGNORE);













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   132














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   133


    /* Filter quit and mouse motion events */













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   134


    SDL_SetEventFilter(FilterEvents);













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   135














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   136


    /* The mouse isn't much use unless we have a display for reference */













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   137


    if ( SDL_SetVideoMode(640, 480, 8, 0) == NULL ) {













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   138


        fprintf(stderr, "Couldn't set 640x480x8 video mode: %s\n",













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   139


                        SDL_GetError());













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   140


        exit(1);













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   141


    }













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   142














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   143


    /* Loop waiting for ESC+Mouse_Button */













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   144


    while ( SDL_WaitEvent(&#38;event) &#62;= 0 ) {













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   145


        switch (event.type) {













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   146


            case SDL_ACTIVEEVENT: {













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   147


                if ( event.active.state &#38; SDL_APPACTIVE ) {













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   148


                    if ( event.active.gain ) {













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   149


                        printf("App activated\n");













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   150


                    } else {













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   151


                        printf("App iconified\n");













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   152


                    }













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   153


                }













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   154


            }













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   155


            break;













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   156


                    













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   157


            case SDL_MOUSEBUTTONDOWN: {













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   158


                Uint8 *keys;













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   159














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   160


                keys = SDL_GetKeyState(NULL);













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   161


                if ( keys[SDLK_ESCAPE] == SDL_PRESSED ) {













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   162


                    printf("Bye bye...\n");













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   163


                    exit(0);













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   164


                }













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   165


                printf("Mouse button pressed\n");













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   166


            }













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   167


            break;













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   168














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   169


            case SDL_QUIT: {













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   170


                printf("Quit requested, quitting.\n");













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   171


                exit(0);













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   172


            }













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changeset




   173


            break;













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   174


        }













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   175


    }













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diff
changeset




   176


    /* This should never happen */













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Initial QEMU (symbian-qemu-0.9.1-12) import



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diff
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   177


    printf("SDL_WaitEvent error: %s\n", SDL_GetError());













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changeset




   178


    exit(1);













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diff
changeset




   179


}</PRE













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   180


></P













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changeset




   181


></DIV













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   182


></DIV













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parents: 

diff
changeset




   183


><DIV













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Initial QEMU (symbian-qemu-0.9.1-12) import



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changeset




   184


CLASS="NAVFOOTER"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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diff
changeset




   185


><HR













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diff
changeset




   186


ALIGN="LEFT"













2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import



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parents: 

diff
changeset




   187


WIDTH="100%"><TABLE













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Initial QEMU (symbian-qemu-0.9.1-12) import



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diff
changeset




   188


SUMMARY="Footer navigation table"













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parents: 

diff
changeset




   189


WIDTH="100%"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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parents: 

diff
changeset




   190


BORDER="0"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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parents: 

diff
changeset




   191


CELLPADDING="0"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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parents: 

diff
changeset




   192


CELLSPACING="0"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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   193


><TR













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changeset




   194


><TD













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Initial QEMU (symbian-qemu-0.9.1-12) import



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changeset




   195


WIDTH="33%"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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parents: 

diff
changeset




   196


ALIGN="left"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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parents: 

diff
changeset




   197


VALIGN="top"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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parents: 

diff
changeset




   198


><A













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Initial QEMU (symbian-qemu-0.9.1-12) import



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parents: 

diff
changeset




   199


HREF="guideexamples.html"













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diff
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   200


ACCESSKEY="P"













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parents: 

diff
changeset




   201


>Prev</A













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diff
changeset




   202


></TD













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Initial QEMU (symbian-qemu-0.9.1-12) import



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parents: 

diff
changeset




   203


><TD













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Initial QEMU (symbian-qemu-0.9.1-12) import



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parents: 

diff
changeset




   204


WIDTH="34%"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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parents: 

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changeset




   205


ALIGN="center"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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parents: 

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changeset




   206


VALIGN="top"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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changeset




   207


><A













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Initial QEMU (symbian-qemu-0.9.1-12) import



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   208


HREF="index.html"













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parents: 

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changeset




   209


ACCESSKEY="H"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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diff
changeset




   210


>Home</A













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Initial QEMU (symbian-qemu-0.9.1-12) import



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changeset




   211


></TD













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Initial QEMU (symbian-qemu-0.9.1-12) import



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parents: 

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changeset




   212


><TD













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Initial QEMU (symbian-qemu-0.9.1-12) import



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changeset




   213


WIDTH="33%"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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parents: 

diff
changeset




   214


ALIGN="right"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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changeset




   215


VALIGN="top"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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changeset




   216


><A













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Initial QEMU (symbian-qemu-0.9.1-12) import



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changeset




   217


HREF="guideaudioexamples.html"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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parents: 

diff
changeset




   218


ACCESSKEY="N"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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diff
changeset




   219


>Next</A













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Initial QEMU (symbian-qemu-0.9.1-12) import



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   220


></TD













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   221


></TR













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   222


><TR













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   223


><TD













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Initial QEMU (symbian-qemu-0.9.1-12) import



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   224


WIDTH="33%"













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changeset




   225


ALIGN="left"













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   226


VALIGN="top"













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   227


>Examples</TD













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   228


><TD













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   229


WIDTH="34%"













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changeset




   230


ALIGN="center"













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diff
changeset




   231


VALIGN="top"













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   232


><A













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Initial QEMU (symbian-qemu-0.9.1-12) import



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   233


HREF="guideexamples.html"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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   234


ACCESSKEY="U"













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Initial QEMU (symbian-qemu-0.9.1-12) import



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   235


>Up</A













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MCL/sf/adapt/qemu