func glyph(face font.Face, char rune, dot fixed.Point26_6) (dr image.Rectangle, mask image.Image, maskp image.Point) {
var ok bool
if dr, mask, maskp, _, ok = face.Glyph(dot, char); !ok {
dr, mask, maskp, _, _ = face.Glyph(dot, utf8.RuneError)
}
return
}
func (p *glyphPage) add(face fnt.Face, r rune) bool {
if _, found := p.entries[r]; found {
panic("Glyph already added to glyph page")
}
b, mask, maskp, _, _ := face.Glyph(fixed.Point26_6{}, r)
bounds := math.CreateRect(b.Min.X, b.Min.Y, b.Max.X, b.Max.Y)
w, h := bounds.Size().WH()
x, y := p.nextPoint.X, p.nextPoint.Y
if x+w > p.size.W {
// Row full, start new line
x = 0
y += p.rowHeight + glyphPadding
p.rowHeight = 0
}
if y+h > p.size.H {
return false // Page full
}
draw.Draw(p.image, image.Rect(x, y, x+w, y+h), mask, maskp, draw.Src)
p.entries[r] = glyphEntry{
offset: math.Point{X: x, Y: y}.Sub(bounds.Min),
bounds: bounds,
}
p.nextPoint = math.Point{X: x + w + glyphPadding, Y: y}
if h > p.rowHeight {
p.rowHeight = h
}
p.tex = nil
return true
}