74235Re: [PATCH] Subpixel rendering artifacts in GUI mode
- Nov 25, 2013On Sun, Nov 24, 2013 at 4:12 PM, Bram Moolenaar <Bram@...> wrote:
>As far as I know, this can happen on any platform whenever subpixel
> 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?
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.
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