all: rename the gioui.org/ui module to gioui.org

The "ui" is redundant and stutters.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

measure/opentype.go

@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+package measure
+
+import (
+	"golang.org/x/image/font"
+	"golang.org/x/image/font/sfnt"
+	"golang.org/x/image/math/fixed"
+)
+
+type opentype struct {
+	Font    *sfnt.Font
+	Hinting font.Hinting
+
+	buf sfnt.Buffer
+}
+
+func (f *opentype) GlyphAdvance(ppem fixed.Int26_6, r rune) (advance fixed.Int26_6, ok bool) {
+	g, err := f.Font.GlyphIndex(&f.buf, r)
+	if err != nil {
+		return 0, false
+	}
+	adv, err := f.Font.GlyphAdvance(&f.buf, g, ppem, f.Hinting)
+	return adv, err == nil
+}
+
+func (f *opentype) Kern(ppem fixed.Int26_6, r0, r1 rune) fixed.Int26_6 {
+	g0, err := f.Font.GlyphIndex(&f.buf, r0)
+	if err != nil {
+		return 0
+	}
+	g1, err := f.Font.GlyphIndex(&f.buf, r1)
+	if err != nil {
+		return 0
+	}
+	adv, err := f.Font.Kern(&f.buf, g0, g1, ppem, f.Hinting)
+	if err != nil {
+		return 0
+	}
+	return adv
+}
+
+func (f *opentype) Metrics(ppem fixed.Int26_6) font.Metrics {
+	m, _ := f.Font.Metrics(&f.buf, ppem, f.Hinting)
+	return m
+}
+
+func (f *opentype) Bounds(ppem fixed.Int26_6) fixed.Rectangle26_6 {
+	r, _ := f.Font.Bounds(&f.buf, ppem, f.Hinting)
+	return r
+}
+
+func (f *opentype) LoadGlyph(ppem fixed.Int26_6, r rune) ([]sfnt.Segment, bool) {
+	g, err := f.Font.GlyphIndex(&f.buf, r)
+	if err != nil {
+		return nil, false
+	}
+	segs, err := f.Font.LoadGlyph(&f.buf, g, ppem, nil)
+	if err != nil {
+		return nil, false
+	}
+	return segs, true
+}