Re: [ft] Enabling Subpixel Rendering On freetype-2.7.1

[Gordon Dickens]

Hi Werner,

I think that I figured it out.  I had also tested with 
TT_CONFIG_OPTION_SUBPIXEL_HINTING set to a value of 1 and the default 
value of 2 neither of which rendered the fonts like previous versions of 
freetype2. It never occured to me to simply undefine it by removing it 
in ftoption.h. So, when I removed the definition of 
TT_CONFIG_OPTION_SUBPIXEL_HINTING then rendering went back to being the 
same as with 2.6.3 and prior versions.

Apparently, if subpixel rendering is enabled by defining 
FT_CONFIG_OPTION_SUBPIXEL_RENDERING then 
TT_CONFIG_OPTION_SUBPIXEL_HINTING must not be defined in order to get 
font rendering like previous versions of freetype2.

So, I think that the problem is solved.  Nevertheless, do you have any 
clarification or information to add?

Thanks,

Gordon




On 03/24/2017 04:15 PM, Gordon Dickens wrote:
> Hi Werner,
>
> Thanks for the reply.
>
> I am running KDE Plasma 5 on OpenSUSE 42.2 and I have been enabling 
> subpixel rendering like this for the past 6 years since 2011 with many 
> versions of freetype2 and the fonts have always been rendered the same 
> regardless of the version of freetype2 that I was using..  Then, with 
> freetype-2.7.1 the font rendering changed. I believe that the 
> rendering differences are most significant in GTK applications.  
> Again, I have been enabling subpixel rendering using a patch that sets 
> the following in ftoption.h:
>
> #define FT_CONFIG_OPTION_SUBPIXEL_RENDERING
>
> Attached are two images of the Arial font in Thunderbird rendered with 
> freetype-2.6.3 and freetype-2.7.1 and the hintstyle set to hintmedium. 
> You will see that the fonts with 2.7.1 are rendered more bolder with 
> thicker fonts than with 2.6.3.  Again, over the last 6 years, I've 
> never noticed the rendering change from one freetype version to 
> another.  However, either something changed with 2.7.1 or I am not 
> doing something correctly.
>
> In the past, prior to freetype-2.7.1, the fonts have been rendered 
> identical to MS Clear Type for any given font and application such as 
> the Arial font with Thunderbird. However, that is no longer the case 
> as can be seen in the attachments.
>
> Let me know if I need to provide any other details regarding my 
> installation.
>
> Thanks very much for your assistance.
>
> Gordon
>
>
>
>
> On 03/24/2017 02:01 PM, Werner LEMBERG wrote:
> > >     I have successfully been enabling subpixel Rendering on previous
> > >     versions of freetype2, most recently with version 2.6.3, with a
> > >     patch that sets the following in ftoption.h:
> > >
> > >     #define FT_CONFIG_OPTION_SUBPIXEL_RENDERING
> > >
> > >     However, when I upgrade to freetype-2.7.1, then the rendering is
> > >     not the same and it doesn't look nearly as good.
> > `Does not look nearly as good' is not something we can work with.
> > Please give more details: Which font, which ppem, etc., etc. Please
> > also provide snapshot images.
> >
> > >     Are there other parameters that need changing or am I doing
> > >     something wrong?
> > Without more details I can't answer this.
> >
> >
> >      Werner
>
>
>
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