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.
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?
Thanks
--David Kotchan
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