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90 lines
4.3 KiB
90 lines
4.3 KiB
13 years ago
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<title>Issues to be aware of when porting TQt/Embedded</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Issues to be aware of when porting TQt/Embedded</h1>
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<p> TQt/Embedded is designed to be reasonably platform-independent. The
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only publically available version is a Linux implementation. The
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following dependencies will need to be addressed if you intend to port
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to another operating system (files that you need to modify are listed
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at the end of each section):
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<p> <ul>
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<p> <li> <b>System V IPC</b> (shared memory and semaphores) is used to share
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window regions between client and server. You will need to provide
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something similar unless you want a single-application setup (i.e.
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running only one program, which is the server). System V semaphores
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are also used for synchronising access to the framebuffer.
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<p> Modify <tt>qwindowsystem_qws.cpp</tt>, <tt>qwsregionmanager_qws.cpp</tt>, <tt>qapplication_qws.cpp</tt>, and <tt>qlock_qws.cpp</tt>.
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<p> <li> <b>Unix-domain sockets</b> are used to communicate things like
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keyboard events, requests to raise windows and TQCOP messages between
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applications. Again, you will need to provide something similar unless
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you want a single-application setup. It should be possible to
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implement something like this using message queues or similar
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mechanisms; with the exception of TQCOP messages (which are generated
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by client applications and not TQt/Embedded) individual messages should
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be no more than a few bytes in length.
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<p> Modify <tt>qwssocket_qws.cpp</tt>.
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<p> <li> <b>The Linux framebuffer device</b> is used to map in the drawing
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area. You will need to replace it (by creating a new class of <a href="qscreen.html">TQScreen</a>)
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with something else giving a byte pointer to a memory-mapped
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framebuffer, plus information about width, height and bit depth (which
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most likely you can simply hard-code). If your framebuffer is not
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memory-mapped or is in an unsupported format or depth you will need to
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modify TQGfxRaster as well.
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<p> Modify <tt>qgfxlinuxfb_qws.cpp</tt>.
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<p> <li> <b>The accelerated drivers</b> currently use the Linux TQScreen and use
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<tt>/proc/bus/pci</tt> to map in PCI config space. However, these are only
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example drivers; you will probably need to write your own driver in
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any case, and you will need to provide your own way to map in control
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registers.
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<p> Modify <tt>qgfxmach64_qws.cpp</tt>, <tt>qgfxvoodoo_qws.cpp</tt> and <tt>qgfxmatrox_qws.cpp</tt>.
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<p> <li> <b>Sound</b> uses a Linux <tt>/dev/dsp</tt> style device. If you want to use
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the TQt/Embedded sound server you'll need to reimplement it.
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<p> Modify <tt>qsoundqss_qws.cpp</tt>.
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<p> <li> <b>select()</b> is used to implement TQSocketDevices and listen for
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events to/from the TQt/Embedded server application.
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<p> Modify <tt>qapplication_qws.cpp</tt>.
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<p> </ul>
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<p> TQt/Embedded makes use of the standard C library and some Posix functions.
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Mostly the latter are concentrated in platform dependent code anyway
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(e.g. mmap() to map in the Linux framebuffer).
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<p>
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<p><address><hr><div align=center>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>TQt 3.3.8</div>
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