diff --git a/text/text.go b/text/text.go index d6662cd..a160da2 100644 --- a/text/text.go +++ b/text/text.go @@ -43,6 +43,7 @@ type Text struct { lineHeight float64 tabWidth float64 + buf []byte prevR rune bounds pixel.Rect glyph pixel.TrianglesData @@ -131,106 +132,85 @@ func (txt *Text) Clear() { } func (txt *Text) Write(p []byte) (n int, err error) { - n, err = len(p), nil // always returns this - - if len(p) == 0 { - return - } - - for len(p) > 0 { - r, size := utf8.DecodeRune(p) - p = p[size:] - txt.WriteRune(r) - } - - return + txt.buf = append(txt.buf, p...) + txt.drawBuf() + return len(p), nil } func (txt *Text) WriteString(s string) (n int, err error) { - if len(s) == 0 { - return - } - - for _, r := range s { - txt.WriteRune(r) - } - + txt.buf = append(txt.buf, s...) + txt.drawBuf() return len(s), nil } func (txt *Text) WriteByte(c byte) error { - //FIXME: this is not correct, what if I want to write a 4-byte rune byte by byte? - _, err := txt.WriteRune(rune(c)) - return err + txt.buf = append(txt.buf, c) + txt.drawBuf() + return nil } func (txt *Text) WriteRune(r rune) (n int, err error) { - n, err = utf8.RuneLen(r), nil // always returns this + var b [4]byte + n = utf8.EncodeRune(b[:], r) + txt.buf = append(txt.buf, b[:n]...) + txt.drawBuf() + return n, nil +} - switch r { - case '\n': - txt.Dot -= pixel.Y(txt.lineHeight) - txt.Dot = txt.Dot.WithX(txt.Orig.X()) - return - case '\r': - txt.Dot = txt.Dot.WithX(txt.Orig.X()) - return - case '\t': - rem := math.Mod(txt.Dot.X()-txt.Orig.X(), txt.tabWidth) - rem = math.Mod(rem, rem+txt.tabWidth) - if rem == 0 { - rem = txt.tabWidth +func (txt *Text) drawBuf() { + for utf8.FullRune(txt.buf) { + r, size := utf8.DecodeRune(txt.buf) + txt.buf = txt.buf[size:] + + switch r { + case '\n': + txt.Dot -= pixel.Y(txt.lineHeight) + txt.Dot = txt.Dot.WithX(txt.Orig.X()) + continue + case '\r': + txt.Dot = txt.Dot.WithX(txt.Orig.X()) + continue + case '\t': + rem := math.Mod(txt.Dot.X()-txt.Orig.X(), txt.tabWidth) + rem = math.Mod(rem, rem+txt.tabWidth) + if rem == 0 { + rem = txt.tabWidth + } + txt.Dot += pixel.X(rem) + continue } - txt.Dot += pixel.X(rem) - return - } - if !txt.atlas.Contains(r) { - r = unicode.ReplacementChar - } - if !txt.atlas.Contains(unicode.ReplacementChar) { - return - } + var rect, frame, bounds pixel.Rect + rect, frame, bounds, txt.Dot = txt.Atlas().DrawRune(txt.prevR, r, txt.Dot) - glyph := txt.atlas.Glyph(r) + txt.prevR = r - if txt.prevR >= 0 { - txt.Dot += pixel.X(txt.atlas.Kern(txt.prevR, r)) - } + rv := [...]pixel.Vec{pixel.V(rect.Min.X(), rect.Min.Y()), + pixel.V(rect.Max.X(), rect.Min.Y()), + pixel.V(rect.Max.X(), rect.Max.Y()), + pixel.V(rect.Min.X(), rect.Max.Y()), + } + + fv := [...]pixel.Vec{pixel.V(frame.Min.X(), frame.Min.Y()), + pixel.V(frame.Max.X(), frame.Min.Y()), + pixel.V(frame.Max.X(), frame.Max.Y()), + pixel.V(frame.Min.X(), frame.Max.Y()), + } + + for i, j := range [...]int{0, 1, 2, 0, 2, 3} { + txt.glyph[i].Position = rv[j] + txt.glyph[i].Picture = fv[j] + } + + txt.tris = append(txt.tris, txt.glyph...) + txt.dirty = true - glyphBounds := glyph.Frame.Moved(txt.Dot - glyph.Orig) - if glyphBounds.W()*glyphBounds.H() != 0 { - glyphBounds = pixel.R( - glyphBounds.Min.X(), - txt.Dot.Y()-txt.Atlas().Descent(), - glyphBounds.Max.X(), - txt.Dot.Y()+txt.Atlas().Ascent(), - ) if txt.bounds.W()*txt.bounds.H() == 0 { - txt.bounds = glyphBounds + txt.bounds = bounds } else { - txt.bounds = txt.bounds.Union(glyphBounds) + txt.bounds = txt.bounds.Union(bounds) } } - - a := pixel.V(glyph.Frame.Min.X(), glyph.Frame.Min.Y()) - b := pixel.V(glyph.Frame.Max.X(), glyph.Frame.Min.Y()) - c := pixel.V(glyph.Frame.Max.X(), glyph.Frame.Max.Y()) - d := pixel.V(glyph.Frame.Min.X(), glyph.Frame.Max.Y()) - - for i, v := range []pixel.Vec{a, b, c, a, c, d} { - txt.glyph[i].Position = v - glyph.Orig + txt.Dot - txt.glyph[i].Picture = v - } - - txt.tris = append(txt.tris, txt.glyph...) - - txt.Dot += pixel.X(glyph.Advance) - txt.prevR = r - - txt.dirty = true - - return } func (txt *Text) Draw(t pixel.Target) {