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text: add comments about positioning

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Hajime Hoshi 2022-11-23 22:16:41 +09:00
parent 9e9cec249a
commit 003474152c
1 changed files with 14 additions and 5 deletions
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13
text/text.go
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@ -60,10 +60,15 @@ func drawGlyph(dst *ebiten.Image, face font.Face, r rune, img *ebiten.Image, dx,
*op2 = *op
op2.GeoM.Reset()
}
// Adjust the position to the integers.
// The current glyph images assume that they are rendered on integer positions so far.
// The nearest filter cannot handle float positions.
op2.GeoM.Translate(math.Floor(fixed26_6ToFloat64(dx+b.Min.X)), math.Floor(fixed26_6ToFloat64(dy+b.Min.Y)))
if op != nil {
op2.GeoM.Concat(op.GeoM)
}
dst.DrawImage(img, op2)
}
@ -125,18 +130,19 @@ func getGlyphImage(face font.Face, r rune) *ebiten.Image {
Src: image.White,
Face: face,
}
// Adjust the dot position so that the glyph image can be rendered on integer positions.
// The nearest filter cannot handle float positions.
x, y := -b.Min.X, -b.Min.Y
x, y = fixed.I(x.Ceil()), fixed.I(y.Ceil())
d.Dot = fixed.Point26_6{X: x, Y: y}
d.DrawString(string(r))
img := ebiten.NewImageFromImage(rgba)
if _, ok := glyphImageCache[face][r]; !ok {
glyphImageCache[face][r] = &glyphImageCacheEntry{
image: img,
atime: now(),
}
}
return img
}
@ -433,6 +439,9 @@ func AppendGlyphs(glyphs []Glyph, face font.Face, text string) []Glyph {
if img := getGlyphImage(face, r); img != nil {
b := getGlyphBounds(face, r)
// Adjust the position to the integers.
// The current glyph images assume that they are rendered on integer positions so far.
// The nearest filter cannot handle float positions.
glyphs = append(glyphs, Glyph{
Rune: r,
Image: img,