Poor quality font rendering

John Hendrikx hjohn at xs4all.nl
Thu Aug 22 00:29:05 PDT 2013

I took another good look, and I see what is bothering me is mostly how 
the glyph "2" is rendered on my system (it has a thick appearing curve 
attached to the base).  I've included a screenshot of my application 
that uses several different sizes fonts, but it seems only the ones in 
the top bar are rendered somewhat wierd.


I'm on Windows 7, JavaFX 8b99, 32-bit, using D3D pipeline (I get this 
stuff in log in an infinite loop, so must be D3D I think):

D3D Vram Pool: 129,613,674 used (48.3%), 129,613,674 managed (48.3%), 
268,435,456 total                   -- 
75 total resources being 
-- com.sun.prism.impl.ManagedResource.printSummary(ManagedResource.java:153)
4 permanent resources 
-- com.sun.prism.impl.ManagedResource.printSummary(ManagedResource.java:154)
2 resources locked 
-- com.sun.prism.impl.ManagedResource.printSummary(ManagedResource.java:156)
43 resources contain interesting data 
(57.3%)                                                             -- 
0 resources disappeared 
-- com.sun.prism.impl.ManagedResource.printSummary(ManagedResource.java:160)

I also have this in main, before Application.launch is called:

     System.setProperty("prism.lcdtext", "false");

In .root in CSS I have:

   -fx-font-family: "Arial";
   -fx-font-size: 16px;
   -fx-font-weight: normal;

So all the fonts you see should be Arial (but the sizes and weights are 
tweaked depending on location).


On 21/08/2013 20:51, Felipe Heidrich wrote:
> John H:
> In JFX we decided to go with sub-pixel positioned text (as opposite to pixel grid aligned).
> That said, on Windows for grayscale text, we are not doing that (yet). Are you running Windows, with D3D pipeline ?
> I would need to see a picture to be sure I understand the problem you describe.
> Felipe
> On Aug 21, 2013, at 10:19 AM, John Hendrikx wrote:
>> I think I also noticed a change in font rendering around b99 somewhere... the fonts seem to be thinner than before, or perhaps more poorly aligned with pixel boundaries.  I'd prefer glyphs laid out in the same way each time, ie. letters are always on a new pixel boundary, so the same letter will look the same regardless of what preceeds it.  I have LCD rendering turned off as I donot appreciate colored fringes on my glyphs.
>> On 21/08/2013 14:53, John C. Turnbull wrote:
>>> I have only really tested JavaFX extensively on Windows so my comments here
>>> apply mainly to that platform.
>>> It seems that even with a font smoothing type of LCD, font rendering in
>>> JavaFX is not at the same level of quality of native applications.  My
>>> current experiences are with JavaFX 8 b103 and I find that all rendered text
>>> in JavaFX appears of a significantly poorer quality than that which I would
>>> see in Word for example or even in IE10 (which I believe uses the same text
>>> rendering engine).  Also, these observations are based on text in "standard"
>>> controls and the quality of font rendering is dramatically worse within the
>>> Canvas control.
>>> I am not an expert in font technology but I have read many times that the
>>> levels of antialiasing for text that can be achieved in a GPU-based renderer
>>> are always going to be less than that achieved in a CPU-based renderer.
>>> This is often explained on the basis of graphics card drivers being
>>> optimised for performance and the rapid rendering of triangles commonly
>>> required in games rather than for rendering quality when it comes to text.
>>> Is this the reason why JavaFX font rendering appears less legible and of a
>>> lower quality than native apps?
>>> If so, how does IE10 for example achieve a higher quality of rendering when
>>> it seems to also use DirectWrite?
>>> Is the quality of JavaFX font rendering ever going to improve?
>>> Thanks,
>>> -jct

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