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text: fix bitmap y offset computation

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This commit fixes a bug that would incorrectly baseline bitmap glyphs text if the line
contained another font with a taller line height. The logic for computing the y offset of
the glyph incorrectly assumed that the Glyph.Ascent was particular to the glyph instead of
the line. I've updated it to use a glyph-specific value.

Signed-off-by: Chris Waldon <christopher.waldon.dev@gmail.com>
This commit is contained in:
Chris Waldon
2023-07-14 16:59:28 -04:00
committed by Elias Naur
parent 6d925a12ff
commit 5606a961f2
1 changed files with 1 additions and 1 deletions
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text/gotext.go
+1 -1
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@@ -674,7 +674,7 @@ func (s *shaperImpl) Bitmaps(ops *op.Ops, gs []Glyph) op.CallOp {
} }
off := op.Affine(f32.Affine2D{}.Offset(f32.Point{ off := op.Affine(f32.Affine2D{}.Offset(f32.Point{
X: fixedToFloat((g.X - x) - g.Offset.X), X: fixedToFloat((g.X - x) - g.Offset.X),
Y: fixedToFloat(g.Offset.Y - g.Ascent), Y: fixedToFloat(g.Offset.Y + g.Bounds.Min.Y),
})).Push(ops) })).Push(ops)
cl := clip.Rect{Max: imgSize}.Push(ops) cl := clip.Rect{Max: imgSize}.Push(ops)