11.7. Summary
As illustrated in Figure 11-14, building an appliance's GUI requires the use of several layers.
Figure 11-14. The Laddie framebuffer UI and graphics stack
The Linux framebuffer device driver provides an abstraction of video hardware that facilitates configuring the video mode and manipulating pixel memory. Various graphics libraries are available that use this device driver, and these libraries provide support for manipulating graphical objects and text. These libraries typically provide support for event handling, as well. We chose to use the Simple DirectMedia Layer for the Laddie appliance because it is well supported, well documented, ...
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