On 11/10/20 1:43 AM, Sam Varshavchik wrote: > libxcb has no involvement with actual drawing or rendering. It's sole > function is to transmit requests, and all their parameters, to the X > server which then executes them. libxcb is really just a very thin > mapping layer between a functional API and X protocol messages. Great, then we can rule out any XCB issues. >> xcb_poly_line (connection, XCB_COORD_MODE_ORIGIN, window, >> foreground, 5, diamond); > This would be the PolyLine request: > > https://www.x.org/releases/X11R7.7/doc/xproto/x11protocol.html#requests:PolyLine
Thanks, I've now read the polyline section thoroughly, some other sections not as thoroughly, and skimmed the rest of the document. > Note the nuanced detail of how various coordinates get interpreted and > the meticulous detail in defining the actual drawn pixels. Yes, the documentation is pretty exact in many aspects. > You're going to have to sift through the specification, to get the > details of what happens. That's just one example (whose answer I don't > recall off the top of my head), you'll have to decipher what's > happening in your case similarly. I can't find anything that reasonably will account for the behaviour I see, although I have not yet fully comprehended the protocol. >From the polyline section: "The lines join correctly at all intermediate points, and if the first and last points coincide, the first and last lines also join correctly." - Even without defining "join correctly" my example on my machine joins the lines differently. My diamonds are looking like this (missing right corner pixel): X X X X X X X Except when starting and ending at the right corner, in which case my diamonds look like this: X X X X X X X X My reasoning is: Entire shape is within clipping/bounding (as far as I can see at least), the line joins should "join correctly", the polylines consist of the same points (another test I made) but still the diamond is only rendered correctly if the rightmost corner is first/last. To me this seems inconsistent. How does it render on your machine?
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