[cairo] How to simulate a LineDDA of Windows GDI?

[vdgame]

How to simulate a LineDDA of Windows GDI?

The LineDDA function determines which pixels should be highlighted for a line defined by the specified starting and ending points.

The LineDDA function passes the coordinates for each point along the line, except for the line's ending point, to the application-defined callback function. In addition to passing the coordinates of a point, this function passes any existing application-defined data. 

The coordinates passed to the callback function match pixels on a video display only if the default transformations and mapping modes are used. 
 
thx!
 
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