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ReStructuredText
22 lines
1.0 KiB
ReStructuredText
Linux Specific Implementation Details
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The Linux specific implementation of the IOManager is written around the Linux
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X11 Windowing System. The X11 windowing system can run simultaneously to other
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X11 Window Systems, and each is defined by a ``Display``.
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A ``Window`` on a ``Display`` is represented as an unsigned integer.
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To retreive data that is on a window, we use the XGetImage function. This
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function returns an XImage which contains the raw data. Simba then returns the
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pointer to this data. The image has to be freed afterwards; and this is done in
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the ``FreeReturnData`` procedure. Alternatively we could copy the image data to
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another place and then free the XImage, but this would result in additional
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overhead.
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Most mouse related functionality is implemented with XQueryPointer, XWarpPointer
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and XTestFakeButtonEvent. (Requires XTest Extension)
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All the keyboard functions use XTest as well. It currently lacks the
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functionality to test if a key on the keyboard is down.
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