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LibGfx/OpenType: Load x-height metrics from OS/2 table if available

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Before this change we always returned the font's point size as the
x-height which was basically never correct.

We now get it from the OS/2 table (if one with version >= 2 is available
in the file). Otherwise we fall back to using the ascent of the 'x'
glyph. Most fonts appear to have a sufficiently modern OS/2 table.
This commit is contained in:
Andreas Kling 2023-06-10 14:50:03 +02:00
parent 8090adf268
commit 69c33bd4ca
6 changed files with 50 additions and 1 deletions
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8
Tests/LibWeb/Layout/input/css-ex-unit.html Normal file
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@ -0,0 +1,8 @@
<!doctype html><style>
div {
font: 20px SerenitySans;
width: 10ex;
height: 15ex;
background: red;
}
</style><div>