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text/v2: make glyphVariationCount more flexible

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Updates #2843
This commit is contained in:
Hajime Hoshi 2023-11-16 12:36:24 +09:00
parent 8352be9369
commit c7843a4e2b
1 changed files with 14 additions and 6 deletions
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20
text/v2/text.go
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@ -96,15 +96,23 @@ func float64ToFixed26_6(x float64) fixed.Int26_6 {
}
func glyphVariationCount(face Face) int {
m := face.Metrics()
if (m.HAscent != 0 || m.HDescent != 0) && m.HAscent+m.HDescent < 16 {
var s float64
if m := face.Metrics(); face.direction().isHorizontal() {
s = m.HAscent + m.HDescent
} else {
s = m.VAscent + m.VDescent
}
// The threshold is decided based on the rendering result of the examples (e.g. examples/text, examples/ui).
if s < 20 {
return 8
}
if (m.VAscent != 0 || m.VDescent != 0) && m.VAscent+m.VDescent < 16 {
return 8
}
// TODO: For big faces, a smaller value might be enough.
if s < 40 {
return 4
}
if s < 80 {
return 2
}
return 1
}
func adjustGranularity(x fixed.Int26_6, face Face) fixed.Int26_6 {