Re: [PATCH 0/1] MR1192: win32u: Prevent division by zero in scale_font_metrics().

[Nikolay Sivov (＠nsivov)]

Thanks, I was able to reproduce with some version of this font that I found.

The issue is in calc_ppem_for_height() I believe:

```
1932         if(pOS2->usWinAscent + windescent == 0)
1933             units = pHori->Ascender - pHori->Descender;
1934         else
1935             units = pOS2->usWinAscent + windescent;
1936         ppem = pFT_MulDiv(ft_face->units_per_EM, height, units);
```

Here 'units' is about 9000 * 2, units_per_EM for this font from 'head' is 1000. For a height of 6 this produces ppem == 0.

Later in freetype_set_outline_text_metrics() this gives em_scale == 0. That scales tmAscent/tmDescent and others to 0.

So, it's a bigger issue than just one metric getting reset.