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MT + Subpixel appear incompatible in Painter [message #50851]

Wed, 09 January 2019 10:51

Tom1
Messages: 1225
Registered: March 2007

Senior Contributor

Hi,

It seems that running Painter with MT using subpixel rendering causes erroneous results. This can be seen on PainterExamples when Both MT and Subpixel are enabled.

Best regards,

Tom

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Re: MT + Subpixel appear incompatible in Painter [message #50856 is a reply to message #50851]

Thu, 10 January 2019 12:19

mirek
Messages: 14016
Registered: November 2005

Ultimate Member

It is now fixed, but for now the performance is poor. I will look into it again soon.

Mirek

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Re: MT + Subpixel appear incompatible in Painter [message #50857 is a reply to message #50856]

Thu, 10 January 2019 14:55

Tom1
Messages: 1225
Registered: March 2007

Senior Contributor

Hi Mirek,

Yes, it works now, but like you said: the performance is poor.

I kind of accidentally discovered this problem while trying to find a test case for the random text rendering problem I also reported yesterday. While I'm not currently using sub-pixel in any real application, I thought the issue was worth pointing out.

Thanks and best regards,

Tom

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Re: MT + Subpixel appear incompatible in Painter [message #50858 is a reply to message #50857]

Thu, 10 January 2019 16:29

mirek
Messages: 14016
Registered: November 2005

Ultimate Member

Tom1 wrote on Thu, 10 January 2019 14:55

Hi Mirek,

Yes, it works now, but like you said: the performance is poor.

I kind of accidentally discovered this problem while trying to find a test case for the random text rendering problem I also reported yesterday. While I'm not currently using sub-pixel in any real application, I thought the issue was worth pointing out.

Thanks and best regards,

Tom

Performance fixed. Please test.

(Now onto that text mystery...)

Mirek

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Re: MT + Subpixel appear incompatible in Painter [message #50860 is a reply to message #50858]

Thu, 10 January 2019 17:21

Tom1
Messages: 1225
Registered: March 2007

Senior Contributor

Hi,

Thanks Mirek. I will test this when back in the office tomorrow!

Best regards,

Tom

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Re: MT + Subpixel appear incompatible in Painter [message #50864 is a reply to message #50858]

Fri, 11 January 2019 09:16

Tom1
Messages: 1225
Registered: March 2007

Senior Contributor

Hi,

That's fast! Now with sub-pixel enabled, MT gives a performance boost of 4.4 compared to ST. So, on my current hardware (Core i9-9900K, 8C16T) the performance difference between AA and sub-pixel is only 12 % in favor of AA. Beautiful!

(While this is unlikely to be important, the NoAA on MT is terribly slow. AA and NoAA is on par on ST.)

Thanks and best regards,

Tom

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