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74235Re: [PATCH] Subpixel rendering artifacts in GUI mode

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  • Thomas Tuegel
    Nov 25, 2013
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      On Sun, Nov 24, 2013 at 4:12 PM, Bram Moolenaar <Bram@...> wrote:
      > Thomas Tuegel wrote:
      >> I recently discovered a graphical glitch that occurs sometimes in GUI
      >> mode. If the GUI is using subpixel rendering, characters may leave
      >> artifacts in their neighbors' cells after being erased. I discovered
      >> this in the GTK+2 frontend, but it could be a problem in any GUI,
      >> though it's highly dependent on a system's subpixel rendering
      >> configuration, the font used, and probably some other variables I
      >> haven't even considered.
      >> I am sending a patch which corrects the issue by redrawing the
      >> characters immediately to the left or right of any updated character.
      >> This is the approach already taken with bold characters, which have
      >> the same problem. I merely extended the treatment of bold characters
      >> to apply to any updated character whenever Vim is in GUI mode.
      > Is there a reliable way to know if this is needed? Redrawing more for
      > all GUIs seems overkill. e.g. on Windows it would not be needed, right?

      As far as I know, this can happen on any platform whenever subpixel
      rendering (ClearType on Windows) is enabled. As Ken pointed out,
      though unknown to me, this was already a known issue on Windows. If
      there were a reliable way to detect at runtime that subpixel rendering
      is disabled, then the extra redraws could be disabled. That detection
      is platform-specific, so the GUI would have to do the detection and
      indicate if it wants the extra redraws. On the other hand, the
      overhead associated with the extra redraws is small; most terminal
      emulators on Linux are already doing this, for example.

      Thomas Tuegel

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