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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
commit 69c33bd4ca
Notes: sideshowbarker 2024-07-17 08:34:29 +09:00
6 changed files with 50 additions and 1 deletions
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2
Userland/Libraries/LibGfx/Font/ScaledFont.cpp
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@ -27,7 +27,7 @@ ScaledFont::ScaledFont(NonnullRefPtr<VectorFont> font, float point_width, float
m_pixel_metrics = Gfx::FontPixelMetrics {
.size = (float)pixel_size(),
.x_height = (float)x_height(),
.x_height = metrics.x_height,
.advance_of_ascii_zero = (float)glyph_width('0'),
.glyph_spacing = (float)glyph_spacing(),
.ascent = metrics.ascender,