On Thursday, December 7, 2017 at 8:34:17 AM UTC-5, Ken Takata wrote:
> Hi,
>
> 2017/12/7 Thu 19:56:43 UTC+9 David Kotchan wrote:
> > On Saturday, December 2, 2017 at 7:03:33 AM UTC-8, K.Takata wrote:
> >
> > > Hi,
> > >
> > > This pull-request is a supplemental patch for #2375 (v8.0.1343).
> > >
> > > This introduces some performance improvements and fixes a bug:
> > >
> > > Improve performance when underlines, strikethroughs or undercurls are
> > > used.
> > >
> > > v8.0.1343 uses GDI to draw these lines, however, switching between
> > > DirectX and GDI causes terrible slowdown.
> > >
> > > This PR uses Direct2D APIs to draw the lines.
> > >
> > > Improve performance when GDI fallback occurs by using a raster font.
> > >
> > > This PR draws texts on top of a Direct2D surface even if a raster font is
> > > selected.
> > >
> > > Add 'scrlines' suboption to the 'rop' option for performance tuning.
> > >
> > > On some environments, redrawing is faster than scrolling. (On my
> > > environment, redrawing is about 2x faster.)
> > >
> > > Users can optimize scrolling behavior by using this suboption.
> > >
> > > Fix a bug that the 'mFallbackDC' variable was not properly updated.
> > > ...
> >
> > I very much appreciate the work that went into the rendering improvements.
> > This is great stuff.
> >
> > But after compiling Vim 8 up to patch 1376 (Huge version with GUI; Visual
> > Studio 2017), I am finding that rendering is quite slow on some systems.
> >
> > On my machine at work, which is: Win10 Enterprise, OS build 15063.726,
> > 64-bit, with an AMD Radeon R9 M370X video card, the rendering is much
> > slower than (say) Vim 8 patched to 1366. The screen scrolling cannot keep
> > up with ordinary j/k {up/down} keys held down, for example. Window
> > refreshes are noticeably slow. There are various flickers here and there as
> > the cursor redraws text items on screen during scrolling. These flickers
> > are absent (or are so fast, as to be visually absent) on Vim 8 patch 1366
> > for example.
>
> Oh, that is totally unexpected.
> Does the behavior depends on the text you are editing? The patch 8.0.1369
> should have improved the performance when showing underlines, undercurls, etc.
> Does the scroll speed change when the following setting is used?
>
> set rop=type:directx,scrlines:1
>
>
> > On the other hand, on my machine at home, which is: Win10 Pro, OS build
> > 15063.726, 64-bit, with an NVidia GeForce GTX 745 video card, there are no
> > problems at all(!) Vim 8 patch 1376 is just as fast as patch 1366, and the
> > new colored Emoji show up fine.
> >
> > Both systems use the same monospace font (Roboto Mono) and have the same
> > _vimrc, _gvimrc and plugins. No Vim functionality is impaired, just the
> > drawing speed.
> >
> > Does anyone has any ideas why rendering performance would be so different
> > on what would seem to be two essentially identical operating systems and (I
> > would have thought) more or less equally capable video cards?
>
>
> Regards,
> Ken Takata
After this update, I am having several issues :
-y and g are cutoff
-artifacts are left behind (see after pic below the status line)
-status line is miss aligned
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