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Re: Error in GNUstep Windows rendering


From: Gregory Casamento
Subject: Re: Error in GNUstep Windows rendering
Date: Wed, 10 Feb 2016 11:43:40 -0500

When was the Windows installer that was used created?  Are we sure this is not a bug that has already been resolved in development?

On Wednesday, February 10, 2016, Ivan Vučica <address@hidden> wrote:
If someone wants to continue looking into fixing this, I've spent a few minutes trying to track this down completely blindly (i.e. I didn't actually run any code). 

The number 16 in '16 characters until whitespace appears' _seems_ to come from:
  http://svn.gna.org/svn/gnustep/libs/gui/trunk/Source/NSLayoutManager.m
method -drawGlyphsForGlyphRange:atPoint: line "#define GBUF_SIZE 16 /* TODO: tweak */".

Combined with Riccardo's mention that this may be related to DPI, and following the call to C function GSShowGlyphsWithAdvances() from
  http://svn.gna.org/svn/gnustep/libs/gui/trunk/Source/NSGraphicsContext.m
I'd say the fixer will want to look at
  http://svn.gna.org/svn/gnustep/libs/back/trunk/Source/cairo/CairoGState.m
method -GSShowGlyphsWithAdvances:::, and
  http://svn.gna.org/svn/gnustep/libs/back/trunk/Source/cairo/CairoFontInfo.m
method -drawGlyphs:length:on:.

(I'll post this in the bug as well.)

On Wed, Feb 10, 2016 at 3:50 PM Ivan Vučica <address@hidden> wrote:
Odd whitespace in the middle of a word is also a bug. It seems to happen after exactly 16 glyphs.

I filed Savannah bug 47109.

James, additional repro steps would be appreciated. Can you confirm the issue goes away if you follow Riccardo's advice?

On Wed, Feb 10, 2016 at 11:02 AM, Riccardo Mottola <address@hidden> wrote:
Hi,

I am pretty sure you have a resolution problem, I have seen this several times on windows (and also on X11 on one FreeBSD workstation).

Please set your Windows to "100%" and do not enlarge text and icons.

For some reason, we enlarge the controls, but then use a small font to draw the text. It would be best of course to "scale" up also the the font, or, at least to ignore the resize and keep everything pixels-sized to GNUstep, but currently it is hybrid.


Riccardo

On 02/10/16 03:35, James Carthew wrote:
Attached is a picture showing the rendering error. This was generated using the pre-built windows files from the GNUstep website. 


Inline
          images 1


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--
Gregory Casamento
GNUstep Lead Developer / OLC, Principal Consultant
http://www.gnustep.org - http://heronsperch.blogspot.com
http://ind.ie/phoenix/


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