different advances to compare with what is got by ios api

[Xinhua Chen]

Dear everyone，

we have developed a ios program with objective-c and ios system,  but skia is not called. Now we are develping a cross-platform program with skia and c++. 

I found a different advance with the same font and style in the two programs. For example, use arial regular font to render "REF". Debug the skia program, the advances.fx is 21.00, 19.00, 18.00.  Debug the iso program with same case, the advances.width is 20.79843 , 19.2093, 17.5921.

The different advances caused differnt wrapping line in the two programs. we hope that the warpping line is the same in different programs. I want to know why they are different?  how to fix the problem.

 Hoping for your help.Give my best regards for your help.

[Xinhua Chen]

the ios program looks like this code for text. https://developer.apple.com/library/archive/documentation/StringsTextFonts/Conceptual/CoreText_Programming/LayoutOperations/LayoutOperations.html

[Mike Reed]

If you're getting rounded values from Skia, you can try changing SkFont settings to ask for fractional ones.

- subpixel

- linearmetrics

- SkFontHinting::kSlight | kNone

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